Contact module tripping structure and circuit breaker

Abstract

The utility model discloses a contact module tripping structure, which comprises a contact switch, a draw bar, a push rod, an armature arranged in a circuit breaker, a static contact and a magnet yoke, the draw bar is abutted against the contact switch, the armature is connected with the push rod, the magnet yoke is fixedly arranged on the static contact, and the static contact is connected with the draw bar. When large current passes through the static contact, the magnet yoke generates a magnetic field used for attracting the armature to move within a set range, the action of the armature drives the push rod to abut against the traction rod, and the traction rod moves within the set range through abutting of the push rod. The utility model also discloses a circuit breaker. According to the utility model, a tripping structure formed by the armature, the static contact, the push rod and the draw bar is adopted, the structure of the constituent parts is simple, the constituent parts can be reasonably arranged in the structure of the contact module, the space occupied by the contact module is small, the volume of the whole contact box is reasonably controlled, and the reasonable installation of the tripping structure in each circuit breaker can be ensured in the arrangement of a multi-phase circuit breaker.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a contact module tripping structure and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time. By setting a tripping structure, it can trip quickly when leakage, short circuit, etc. occur in the circuit breaker circuit.

[0003] Traditional circuit breakers have many tripping structural components, so they are often arranged outside the contact module and occupy a large amount of volume in the contact box, resulting in excessive difficulty and complexity in installation. In addition, the structural complexity is large, resulting in excessive overall movement resistance of each component in the event of an abnormal situation, affecting the speed and degree of tripping. Furthermore, in existing power usage scenarios, most of the multi-phase circuit breakers used are arranged together with multiple circuit breakers. In order to ensure the abnormal tripping capability of all circuit breakers, this type of external tripping actuator is difficult to cover all circuit breakers for installation, and may even make it impossible to install on some phase contact modules to achieve short-circuit fault tripping, making it difficult to ensure power safety. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a contact module tripping structure and a circuit breaker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A contact module tripping structure includes a contact switch, a traction rod, a push rod, an armature arranged in a circuit breaker, a static contact and a yoke. The traction rod abuts the contact switch, the armature is connected to the push rod, and the yoke is fixed to the static contact. When a large current passes through the static contact, the yoke generates a magnetic field for attracting the armature to move within a set range. The action of the armature drives the push rod to abut against the traction rod. The traction rod moves within a set range due to the abutment of the push rod to disengage from the contact switch.

[0007] Furthermore, the circuit breaker includes a shell, a cavity for accommodating the armature is formed in the shell, an arc-shaped protrusion is provided at one end of the armature, and a slot is provided on the inner wall of the cavity for the protrusion to extend into, and the protrusion can rotate around the slot.

[0008] Furthermore, an arc extinguishing chamber is provided in the circuit breaker, an air duct is provided in the shell, two ends of the air duct are respectively connected to the arc extinguishing chamber and the cavity, and the opening of the air duct in the cavity is arranged below the armature.

[0009] Furthermore, the circuit breaker is provided with a first rotating shaft, the traction rod is sleeved on the first rotating shaft, and can rotate within a set range with the first rotating shaft as the center, and the traction rod is provided with a snap portion for abutting against the contact switch.

[0010] Furthermore, a second rotating shaft is provided in the middle of the push rod, and the second rotating shaft is connected to the circuit breaker, so that the push rod can rotate within a set range with the second rotating shaft as the center, and the top end of the push rod forms an abutting portion for abutting against the traction rod.

[0011] Furthermore, the push rod is provided with a through hole, and the armature is provided with a push rod for passing through the through hole.

[0012] Furthermore, a return spring is provided on the push rod, a support member is fixedly provided on the shell, two ends of the return spring are respectively connected to the push rod and the support member, and the elastic direction of the return spring is the same as the movement direction of the push rod.

[0013] Furthermore, the return spring is detachably connected to the push rod and the support member.

[0014] A circuit breaker, wherein the circuit breaker is provided with the above-mentioned contact module tripping structure

[0015] In summary, the benefits of the present invention are:

[0016] The utility model adopts a tripping structure formed by an armature, a static contact, a push rod and a traction rod. The structure of the components is simple and can be reasonably arranged inside the structure of the contact module, occupying less space of the contact module and reasonably controlling the volume of the overall contact box. For the setting of a multi-phase circuit breaker, it can ensure that the tripping structure in each circuit breaker is reasonably installed; the action caused by the armature is transmitted by the push rod and the traction rod to achieve the tripping of the contact switch; the action of the armature is driven by the magnetic field of the magnetic yoke or by the impact of high-temperature gas inside the circuit breaker, effectively ensuring that tripping can be achieved under various abnormal conditions; the action transmission formed by the push rod and the traction rod has a stable and reliable force point, reduces the invalid stroke and the transmission resistance consumption, and enables the tripping action to be achieved quickly and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the circuit breaker structure in the locked state of the utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the tripping structure.

[0019] Figure 3 for Figure 2 Schematic diagram of the cross-section structure in.

[0020] Figure 4 This is a schematic diagram of the circuit breaker structure in the tripped state of the utility model.

[0021] Figure 5 for Figure 4 Schematic diagram of the tripping structure.

[0022] Figure 6 for Figure 5 Schematic diagram of the cross-section structure in.

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the cavity and armature part in the circuit breaker.

[0024] Figure 8 Schematic diagram of the structure of the armature.

[0025] Markings in the figure: 11, contact switch; 111, locking plate; 112, static contact; 113, yoke; 12, housing; 13, arc extinguishing chamber; 14, air duct; 15, support member; 2, armature; 21, protrusion; 22, cavity; 23, push rod; 3, traction rod; 31, first rotating shaft; 32, snap portion; 4, push rod; 41, abutment portion; 42, through hole; 43, second rotating shaft; 44, return spring. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed arbitrarily, and the component layout type may also be more complicated.

[0028] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the perpendicular relationship may actually be an approximately perpendicular relationship.

[0030] This embodiment discloses a fast tripping structure for use in a circuit breaker when a high current short circuit occurs in a contact module, so that the circuit breaker has dual backup short circuit protection effects of magnetic blowing and air blowing.

[0031] The circuit breaker includes two shells 12 arranged opposite to each other, and the two shells 12 are opposite to each other on the left and right to form the outer shell structure of the circuit breaker, and the inside of the shell forms an installation space for accommodating components such as the contact switch 11, arc isolation plate, arc isolation member, arc extinguishing chamber 13, static contact 112, magnetizing plate, yoke 113, armature 2, etc.

[0032] Among them, the static contact 112 and the armature 2 are both arranged on the same side inside the circuit breaker, the yoke 113 is fixedly arranged on the static contact 112, and the armature 2 is located below the static contact 112. When a large current passes through the circuit inside the circuit breaker or causes a short circuit, the large current passes through the static contact 112 to cause the yoke 113 to generate a magnetic field, causing the armature 2 to move upward.

[0033] The circuit breaker is provided with a contact switch 11 for closing and opening the circuit breaker, and a traction rod 3 connected by a first rotating shaft 31. The mechanical transmission linkage on the contact switch 11 is provided with a lock plate 111. The lock plate 111 is connected to a reaction spring inside the circuit breaker so that the lock plate 111 is in a tensioned state when the contact switch 11 is closed. The traction rod 3 can rotate within a certain angle range. One end of the traction rod 3 is provided with a snap portion 32 for cooperating with the lock plate 111. The action range of the traction rod 3 includes a locked state and a tripped state. In the locked state, refer to Figure 1 、 Figure 2 and Figure 3 The locking plate 111 is held in tension by the buckle portion 32 and cannot move, thus keeping the contact switch 11 closed; in the tripped state, refer to Figure 4 、 Figure 5 and Figure 6 , the locking plate 111 is separated from the locking portion 32, and then can rebound to drive the contact switch 11 to open.

[0034] Reference Figure 7A cavity 22 for accommodating the armature 2 is formed in the circuit breaker. A protrusion 21 is provided at one end of the armature 2. The inner wall of the cavity 22 is provided with a slot for the protrusion 21 to extend into. The protrusion 21 is arc-shaped, so that the armature 2 can flip within a certain vertical angle with the slot as a fulcrum. In the initial state and normal working state of the circuit breaker, the armature 2 falls to the bottom of the cavity 22. When a large current passes through the circuit breaker, the magnetic field generated by the yoke 113 attracts the armature 2, driving it to flip upward.

[0035] When the circuit breaker is operating normally, the draw bar 3 is in a locked state, limiting the movement of the contact switch 11 and keeping it in a closed state. When a large current flows through the circuit breaker, the movement of the armature 2 causes the draw bar 3 to switch from a locked state to a tripped state, allowing the contact switch 11 to move to an open state to cut off the current.

[0036] The circuit breaker is provided with a push rod 4 for transmitting the movement of the armature 2 to the movement of the traction rod 3. The middle part of the push rod 4 is hinged to the housing 12 through a second rotating shaft 43, so that the push rod 4 can rotate within a certain angle range with the second rotating shaft 43 as the center. The armature 2 is provided with a push rod 23, and the push rod 23 extends toward the push rod 4. A through hole 42 for penetrating the push rod 23 is formed on the push rod 4. Under the flipping action of the armature 2, the push rod 23 contacts the inner wall of the through hole 42 to drive the rotation of the push rod 4.

[0037] An abutment portion 41 for interacting with the traction rod 3 is formed on the top of the push rod 4. When the circuit breaker is in normal working condition and the traction rod 3 is locked, the abutment portion 41 does not contact the traction rod 3. When a large current passes through the circuit breaker, the armature 2 drives the push rod 4 to rotate, causing the abutment portion 41 to move toward and abut against the traction rod 3, thereby pushing the traction rod 3 to rotate, causing the buckle portion 32 to disengage from the contact switch 11 and enter a tripped state.

[0038] Furthermore, a return spring 44 is provided on the push rod 4, and support members 15 are fixedly provided on both sides outside the shell. The two ends of the return spring 44 are respectively connected to the push rod 4 and the support member 15, and the elastic direction of the return spring 44 is set in the same direction as the rotation direction of the push rod 4. When the circuit breaker is in normal working state and the traction rod 3 is locked, the return spring 44 maintains the push rod 4 in a position where it does not contact the traction rod 3. When the armature 2 drives the push rod 4 to move, the return spring 44 generates a certain force for resisting the rotation of the push rod 4, and when the armature 2 is reset, it synchronously drives the push rod 4 to reset.

[0039] By providing a detachable connection between the reset spring 44 and the push rod 4 and the support member 15, the user can replace the elastic force specifications of the reset spring 44 according to actual usage requirements, thereby achieving the function of adjusting the current required when the circuit breaker triggers the tripping state. The detachable connection includes but is not limited to providing holes, columns, etc. on the push rod 4 and the support member 15 for the reset spring 44 to be embedded, or providing a hook to clamp the reset spring 44, etc.

[0040] It should be added that an air duct 14 is also provided inside the shell 12, and an arc extinguishing chamber 13 for extinguishing arcs is provided inside the circuit breaker. The two ends of the air duct 14 are respectively connected to the cavity 22 and the arc extinguishing chamber 13, and the opening of the air duct 14 at the cavity 22 is directly below the armature 2. When a large fault current passes through or causes a short circuit, arc gas will also be generated in the circuit breaker, especially in areas such as the arc extinguishing chamber 13. The setting of the air duct 14 can introduce arc gas into the cavity 22 to produce an upward impact on the armature 2, and also drive the armature 2 to flip upward, thereby causing the contact switch 11 to disengage, which can be used as a double short-circuit protection circuit breaker to trip and open in time.

[0041] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A contact module tripping structure, characterized in that: The invention comprises a contact switch (11), a traction rod (3), a push rod (4), an armature (2) arranged in a circuit breaker, a static contact (112) and a yoke (113); the traction rod (3) abuts against the contact switch (11); the armature (2) is connected to the push rod (4); the yoke (113) is fixedly arranged on the static contact (112); when a large current passes through the static contact (112), the yoke (113) generates a magnetic field for attracting the armature (2) to move within a set range; the movement of the armature (2) drives the push rod (4) to abut against the traction rod (3); the traction rod (3) is abutted by the push rod (4) and moves within a set range to be separated from the contact switch (11).

2. A contact module tripping structure according to claim 1, characterized in that: The circuit breaker comprises a housing (12), a cavity (22) for accommodating the armature (2) is formed in the housing (12), an arc-shaped protrusion (21) is provided at one end of the armature (2), an inner wall of the cavity (22) is provided with a slot for the protrusion (21) to extend into, and the protrusion (21) can rotate around the slot.

3. A contact module tripping structure according to claim 2, characterized in that: An arc extinguishing chamber (13) is provided in the circuit breaker, an air duct (14) is provided in the housing (12), two ends of the air duct (14) are respectively connected to the arc extinguishing chamber (13) and the cavity (22), and an opening of the air duct (14) in the cavity (22) is arranged below the armature (2).

4. The contact module tripping structure according to claim 1, characterized in that: The circuit breaker is provided with a first rotating shaft (31), the traction rod (3) is sleeved on the first rotating shaft (31), and can rotate within a set range with the first rotating shaft (31) as the center, and the traction rod (3) is provided with a buckle portion (32) for abutting against the contact switch (11).

5. A contact module tripping structure according to claim 4, characterized in that: A second rotating shaft (43) is provided in the middle of the push rod (4), and the second rotating shaft (43) is connected to the circuit breaker, and is used for the push rod (4) to rotate within a set range with the second rotating shaft (43) as the center. The top end of the push rod (4) forms an abutting portion (41) for abutting against the traction rod (3).

6. A contact module tripping structure according to claim 5, characterized in that: The push rod (4) is provided with a through hole (42), and the armature (2) is provided with a push rod (23) for passing through the through hole (42).

7. The contact module tripping structure according to claim 2, characterized in that: The push rod (4) is also provided with a return spring (44), and a support member (15) is fixedly provided on the housing (12). The two ends of the return spring (44) are respectively connected to the push rod (4) and the support member (15), and the elastic force direction of the return spring (44) is in the same direction as the movement direction of the push rod (4).

8. The contact module tripping structure according to claim 7, characterized in that: The return spring (44) is detachably connected to the push rod (4) and the support member (15).

9. A circuit breaker, characterized in that: The circuit breaker is provided with a contact module tripping structure according to any one of claims 1 to 8.

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