Circuit breaker

Abstract

The utility model provides a circuit breaker, which comprises a shell 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 utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a circuit breaker. Background Art

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

[0003] The two moving contacts of the double-breakpoint circuit breaker in the prior art are both single-breakpoint moving contacts, and the two moving contacts have the same opening distance. 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 in different spatial orientations, resulting in a small opening distance of the moving contacts, and the corresponding number of arc-extinguishing grids is limited. The moving contacts are only repelled under a section of reverse current electric repulsion, and the repulsion speed is slow; the double-breakpoint circuit breaker with repulsive contacts in the prior art, as the electric repulsion force decreases during the breaking process, will cause the repulsive contacts to reset and connect again after being repelled, and there is a risk of contact burning and breaking failure, and there is no electric force on the repulsive contacts in the open state, and the repulsive contacts can only remain in the connected state. At this time, there is only one breakpoint to maintain 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 has also exceeded 50kA. Therefore, the circuit breaker is required to have a faster contact disconnection speed, a larger contact opening distance, and a larger number of arc-extinguishing grids.

[0004] In view of this, it is necessary to propose a double-breakpoint circuit breaker with a completely new structure to solve the above problems. Utility Model Content

[0005] Based on the above background, the present application provides a double-breakpoint circuit breaker, which solves the problem of short arc extinguishing chamber length and few grid plates, and solves the problem of false connection and burning caused by the small opening distance and different disconnection of existing similar products, as well as the slow opening of repellable contacts and resetting after opening. The double-breakpoint circuit breaker of the present application has the characteristics of breaking high voltage, high current limiting capacity and good breaking capacity of extremely large current.

[0006] The technical solution of the utility model is as follows:

[0007] A circuit breaker comprises a shell and internal components, wherein the internal components at least comprise an upper arc extinguishing chamber, a lower arc extinguishing chamber, a double breakpoint contact system, a first wiring terminal, a second wiring terminal, an overload releaser, a mechanism, and a rotating shaft, wherein the double breakpoint contact system comprises a single breakpoint moving contact, a double breakpoint moving contact, and a static contact, and is characterized in that: the mechanism drives at least one rotating shaft, the double breakpoint contact system is arranged between the upper arc extinguishing chamber and the lower arc extinguishing chamber, and the single breakpoint moving contact and the double breakpoint moving contact are driven by two rotating shafts respectively.

[0008] In the above embodiment, a mechanism is provided to drive two rotating shafts at the same time, and the two rotating shafts further drive the single-breakpoint moving contact and the double-breakpoint moving contact to move to realize the separation and connection of the two breakpoints. The contact opening distance is large and the isolation performance is good, and high short-circuit current under high voltage can be disconnected.

[0009] In the above embodiment, one end of the double-breakpoint moving contact forms a U-shape with one end of the static contact when in contact and the current flows in opposite directions, and the other end of the double-breakpoint moving contact forms a U-shape with one end of the single-breakpoint moving contact when in contact and the current flows in opposite directions.

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

[0011] In some embodiments, the double-breakpoint 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 can be in contact with and cooperate with the first contact portion and apply a pressure F1 in a first direction to the first contact portion, and the second contact portion can be in contact with and cooperate with the contact portion of the static contact and apply a pressure F2 in a second direction to the contact portion of the static contact, and the pressure F1 and pressure F2 are located on different sides of the rotation center fulcrum, and the pressure on the first contact portion acts on the second contact portion in the form of torque, forming pressure on the static contact.

[0013] In the above embodiment, the torque generated by the pressure of the single-breakpoint moving contact on the double-breakpoint moving contact is converted into pressure on the stationary contact, so that the final pressure on the contact part of the stationary contact increases, the contact resistance becomes larger, and the temperature rise decreases.

[0014] In some embodiments, the first contact portion contacts or separates from the contact portion of the single-breakpoint moving contact to form an upper breakpoint when separated; the second contact portion contacts or separates from the contact portion of the stationary contact to form a lower breakpoint.

[0015] In some embodiments, the opening direction of the upper breakpoint is different from the opening direction of the lower breakpoint.

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

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

[0018] In some embodiments, when the double-breakpoint contact system interrupts the generated 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-breakpoint moving contact and the double-breakpoint moving contact are different.

[0022] In some embodiments, the mechanism includes an upper connecting rod, a lower connecting rod and an auxiliary connecting rod, and 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 end 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 opened, the two breakpoints of the double-breakpoint contact system are simultaneously maintained in an open state.

[0024] The beneficial effects of the utility model are as follows:

[0025] 1. When the circuit breaker of the present application is disconnected or manually opened, the mechanism drives the two sets of rotating shafts to move together so that the two break points remain disconnected at the same time, with a large opening distance and good isolation performance.

[0026] 2. The two breakpoints of the double-breakpoint contact system of the present application are each correspondingly provided with an arc extinguishing chamber, thereby improving the arc extinguishing capability and breaking capability of the circuit breaker.

[0027] 3. The double-breakpoint moving contact of the present application forms a U-shaped repulsive structure with two currents in opposite directions, which has a greater repulsive force, a faster repulsive speed and a higher breaking capacity.

[0028] 4. The present application converts the torque generated by the pressure of the single-breakpoint moving contact on the double-breakpoint moving contact into pressure on the static contact, thereby increasing the final pressure on the contact part of the static contact, reducing the contact resistance, and reducing the temperature rise, thereby avoiding the problem of burning caused by poor contact between the double-breakpoint moving contact and the static contact.

[0029] 5. The upper breakpoint opening direction and the lower breakpoint opening direction of the present application are set in different directions, and the corresponding upper arc extinguishing chamber and the lower arc extinguishing chamber are also set in different directions. By rationally utilizing different directions, the opening distance of the upper breakpoint and the lower breakpoint can be larger than that of the existing circuit breaker, and the number of arc extinguishing grids can be more than that of the existing circuit breaker. The arc is rapidly elongated in the state of large opening distance and enters the arc extinguishing chamber with more arc extinguishing grids. The arc resistance of the arc is increased, thereby establishing a very high arc voltage. The arc is extinguished after deionization. A larger opening distance and a larger number of arc extinguishing grids can disconnect high short-circuit currents under high voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. Obviously, the drawings described below are only some implementation methods recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker of the present application when in a closed state;

[0032] Figure 2 A schematic diagram of the internal structure of the circuit breaker of the present application in the open state;

[0033] Figure 3 A schematic diagram of the double breakpoint system structure of the circuit breaker of the present application;

[0034] Figure 4 A schematic diagram of the three-dimensional structure of the double breakpoint system of the circuit breaker of the present application;

[0035] Figure 5 A schematic diagram of the stress condition of the double breakpoint system of the circuit breaker of the present application;

[0036] Figure 6 A schematic diagram of the second stress condition of the double breakpoint system of the circuit breaker of the present application;

[0037] Figure 7 Schematic diagram of the explosion of the double breakpoint system of the circuit breaker of this application

[0038] Figure 8 This is a schematic diagram of the double-breakpoint moving contact structure of the circuit breaker of the present application;

[0039] Fig. 9 This is a schematic diagram of the single-breakpoint moving contact structure of the circuit breaker of the present application;

[0040] Fig.10 This is a schematic diagram of the static contact structure of the circuit breaker of this application. DETAILED DESCRIPTION

[0041] The features and exemplary embodiments of various aspects of the utility model will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without the need for some of these specific details. The following description of the embodiment is only to provide a better understanding of the utility model by illustrating the utility model example. The utility model is by no means limited to any specific configuration and algorithm proposed below, but covers any modification, replacement and improvement of elements, parts and algorithms without departing from the spirit of the utility model. In the accompanying drawings and the following description, known structures and technologies are not shown in order to avoid unnecessary ambiguity to the utility model.

[0042] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as 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. Other explicit and implicit definitions may also be included below.

[0043] Circuit breakers can be divided into single-breakpoint circuit breakers and double-breakpoint circuit breakers according to the number of breakpoints. The moving contact and the static contact of the prior art double-breakpoint circuit breaker only form a set of contacts, the moving contact has only one reverse current segment, the moving contact is only repelled by a single electric repulsion force, the repulsion speed is slow, and the breaking and current limiting effect is poor; the prior art double-breakpoint circuit breaker with repulsive contacts, as the current decreases and the distance between the contacts increases during the breaking process, the electric repulsion force decreases, which will cause the repulsive contacts to reset and connect after being repelled. If the short-circuit current is not limited to the normal current value after resetting and connecting, the arc will reignite, causing the contacts to burn and the breaking failure. Even when the circuit breaker is opened, the repulsive contacts have no mechanism to drive them and can only remain in the on state. At this time, there is only one breakpoint to maintain the isolation function of the circuit breaker, and the isolation performance of the circuit breaker is poor.

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

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

[0046] The mechanism 20 includes an upper connecting rod 21, a lower connecting rod 22 and an auxiliary connecting rod 23, wherein the upper connecting rod 21, the lower connecting rod 22 and the auxiliary connecting rod 23 are hinged in sequence, 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, and the second rotating shaft 132 is hinged to the other end of the auxiliary connecting rod 23. When the mechanism 20 is driven, the upper connecting rod 21 acts as an active member to drive the lower connecting rod 22 to move, and the lower connecting rod 22 further drives the first rotating shaft 131 to move, and the first rotating shaft 131 drives the auxiliary connecting rod 23 to move. The auxiliary connecting rod 23 moves, and the auxiliary connecting rod 23 further drives the second rotating shaft 132 to move. Through the linkage drive control of the mechanism 20, the two breakpoints of the double-breakpoint contact system 10 are synchronously or asynchronously contacted and separated. This linkage drive control has high synchronization of the two breakpoints, balanced energy during breaking, and good breaking effect. When opening, the two breakpoints of the double-breakpoint contact system 10 can be kept in the disconnected state at the same time 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-breakpoint contact system 10 has two breakpoints. The double-breakpoint moving contact 112 is arranged between the static contact 12 and the single-breakpoint moving contact 111. The double-breakpoint 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 achieve contact and separation of the contact portions. The first contact portion 1121 and the single-breakpoint moving contact 111 are connected to each other. The contact portion 1111 of the contact 111 is in contact or separated, and an upper breakpoint 1124 is formed when separated. The second contact portion 1123 is in contact or separated from the contact portion 121 of the static contact 12, and a lower breakpoint 1125 is formed. The opening direction of the upper breakpoint 1124 is different from that of the lower breakpoint 1125. The circuit breaker is turned on when in contact, and is disconnected when separated. The structure of the upper breakpoint 1124 is similar to that of a single-breakpoint circuit breaker, and it inherits the advantage of a large opening distance of the breakpoint of a single-breakpoint circuit breaker, thereby improving the breaking and current limiting capacity.

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

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

[0050] Please refer to Figure 6In some embodiments, the contact portion 1111 of the single-break moving contact 111 can contact and cooperate with the first contact portion 1121 and apply a first direction pressure F1 to the first contact portion 1121, and the direction can also pass through the rotation center fulcrum 1122. The pressure on the first contact portion 1121 is not transferred to the static contact 12, and the pressure F1 has no effect on the second contact portion 1123 being able to contact and cooperate with the contact portion 121 of the static contact and applying a second direction pressure F2 to the contact portion 121 of the static contact.

[0051] Please continue to refer to Figure 1 and Figure 2 When the circuit breaker is opened, the mechanism 20 drives the two rotating shafts 13 to move, thereby driving the single-breakpoint moving contact 111 and the double-breakpoint moving contact 112 to move simultaneously, so that the two breakpoints of the double-breakpoint contact system 10 change from the contact state to the separation state, and the circuit breaker changes from the on state to the off state. When the short-circuit current passes through, one end of the double-breakpoint moving contact 112 contacts with one end of the static contact 12 to form a U-shaped reverse current structure, which generates an electric repulsion force on the double-breakpoint moving contact 112, and the other end of the double-breakpoint moving contact 112 contacts with one end of the single-breakpoint moving contact 111 to form a U-shaped reverse current structure, so that the double-breakpoint moving contact 112 and the single-breakpoint moving contact 111 generate an electric repulsion force between each other, and the single-breakpoint moving contact 1 11 is repelled open by the electric repulsion force of the double-breakpoint moving contact 112, and the double-breakpoint moving contact 112 is simultaneously repelled open by the electric repulsion force of the static contact 12 and the electric repulsion force of the single-breakpoint moving contact 111. The double-breakpoint moving contact 112 is repelled open faster by the two-segment electric repulsion force than the moving contact in the prior art which is only subjected to one segment of electric repulsion, and has a higher breaking capacity. At the same time, the mechanism 20 drives the two rotating shafts 13 to move, so that the two breakpoints of the double-breakpoint contact system 10 are separated, and an arc is generated between the two separated breakpoints. As the opening distance continues to increase, the arc is elongated and enters the arc extinguishing chamber, and 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 share the voltage and carry the breaking energy, thereby improving the breaking capacity.

[0052] The utility model can be implemented in other specific forms without departing from its spirit and essential characteristics. The current embodiment is considered to be exemplary rather than restrictive in all aspects, and the scope of the utility model is defined by the appended claims rather than the above description, and all changes falling within the meaning and equivalent scope of the claims are thus included in the scope of the utility model.

Claims

1. A circuit breaker, comprising a housing and internal components, wherein the internal components at least include an upper arc extinguishing chamber, a lower arc extinguishing chamber, a double-breakpoint contact system, a first terminal, a second terminal, an overload release, a mechanism, and a rotating shaft, wherein the double-breakpoint contact system includes a single-breakpoint moving contact, a double-breakpoint moving contact, and a static contact, and wherein: The mechanism drives at least one rotating shaft, the double-breakpoint contact system is arranged between the upper arc extinguishing chamber and the lower arc extinguishing chamber, and the single-breakpoint moving contact and the double-breakpoint 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-breakpoint moving contact forms a U-shape with one end of the static contact when in contact, and the current flows in opposite directions; the other end of the double-breakpoint moving contact forms a U-shape with one end of the single-breakpoint moving contact when in contact, and the current flows in opposite directions.

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

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

5. The circuit breaker according to claim 4, characterized in that: The contact portion of the single-break moving contact can be in contact with and cooperate with the first contact portion and apply a pressure F1 in a first direction to the first contact portion, and the second contact portion can be in contact with and cooperate with the contact portion of the static contact and apply a pressure F2 in a second direction to the contact portion of the static contact, and the pressure F1 and pressure F2 are located on different sides of the rotation center fulcrum, and the pressure on the first contact portion acts on the second contact portion in the form of torque, forming pressure on the static contact.

6. The circuit breaker according to claim 4, characterized in that: The first contact portion contacts or separates from the contact portion of the single-breakpoint moving contact, forming an upper breakpoint when separated; the second contact portion contacts or separates from the contact portion of the stationary contact, forming a lower breakpoint.

7. The circuit breaker according to claim 6, characterized in that: An opening direction of the upper breakpoint is different from an opening direction of the lower breakpoint.

8. The circuit breaker according to claim 1, characterized in that: One end of the stationary 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-breakpoint 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, and 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-breakpoint moving contact and the double-breakpoint 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, and 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 end 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.

15. The circuit breaker according to claim 1, characterized in that: When the mechanism is opened, the two breakpoints of the double-breakpoint contact system are simultaneously kept in the disconnected state.

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