Plastic shell type circuit breaker with double-iron-core protection tripper
By introducing a dual-core protection release design into the molded case circuit breaker, dual protection is achieved by using two independent electromagnetic tripping mechanisms, which solves the problem of reduced safety caused by failure of a single electromagnetic tripping mechanism, improves the sensitivity and accuracy of fault detection, and ensures timely disconnection of the circuit.
Patent Information
- Application Number
- CN202510712268.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-09-19
AI Technical Summary
Existing molded case circuit breakers are only provided with one set of electromagnetic tripping structures. Once the set of operating mechanisms stops due to a fault, the circuit breaker cannot perform the tripping operation, resulting in reduced safety.
It adopts a double-core protection release design, including two independent instantaneous tripping mechanisms. The static iron core I and static iron core II are respectively arranged on the main conductor connection plate, perpendicular to each other. Double protection is achieved through the electromagnetic tripping mechanism I and electromagnetic tripping mechanism II to ensure that the circuit is cut off in time in case of fault.
The circuit breaker's detection sensitivity and accuracy for different types of faults are improved, ensuring that the circuit is cut off in time under various fault conditions to protect the safety of electrical equipment and lines.
Smart Images
Figure CN120674283A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electrical equipment, in particular to a plastic-cased circuit breaker with a double-core protection release. Background Art
[0002] A molded case circuit breaker is a switch structure that can automatically cut off the current when the current exceeds the trip setting. Existing molded case circuit breakers with trip indication function generally have three tripping modes: electronic trip The bimetallic thermal trip structure and the electromagnetic trip are both provided with a traction rod in the movable part triggering mechanism. The traction rod can rotate. The rotation of the traction rod triggers the tripping part, causing the opening and closing operating mechanism module to operate and complete the opening action.
[0003] The electromagnetic release is an instantaneous mechanical tripping structure. When the load circuit is short-circuited and the instantaneous current overload amplitude is relatively large, the main circuit of the circuit breaker generates a strong magnetic field, thereby triggering the static iron core to attract the moving iron core, and finally triggering the traction rod to rotate, thereby completing the circuit tripping operation. At present, traditional molded case circuit breakers are only equipped with one set of electromagnetic tripping structures. Once this set of operating mechanisms stops due to a fault, the circuit breaker will not be able to perform the tripping operation. Summary of the Invention
[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a plastic case circuit breaker with a dual iron core protection release. When a short circuit occurs in the load system, the circuit breaker performs a double protection tripping operation through two independent instantaneous tripping mechanisms, with high safety performance.
[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A plastic case circuit breaker with a double iron core protection release, comprising a base and a cover. The base is provided with a traction rod. The circuit breaker outlet is provided with an L-shaped main conductor connection plate, which includes a horizontal portion and a vertical portion. The base is provided with a double iron core electromagnetic trip device, which includes an electromagnetic trip mechanism I and an electromagnetic trip mechanism II: The electromagnetic tripping mechanism I includes a static iron core I, a moving iron core I, a bracket I, a rotating shaft rod, and a push rod. The bracket I is fixedly arranged above the horizontal portion, the static iron core I is fixedly connected to the horizontal portion, the moving iron core I is an L-shaped plate, which is arranged above the static iron core I and in front of the bracket I. The lower end thereof is hinged to the lower end of the bracket I. The moving iron core I is connected to the bracket I through a spring I, and the spring I gives the moving iron core I an upward pulling force. The rotating shaft rod is arranged above the moving iron core I and can rotate, and is connected to a torsion spring I. The rotating shaft rod is fixed with a buckle I, the upper end of the moving iron core I is in active contact with the buckle I, the upper end of the rotating shaft rod is clamped with the push rod through the buckle II, the push rod is horizontally arranged above the rotating shaft rod, and is perpendicular to the rotating shaft rod. It is connected with a spring II, and the push rod can be displaced forward and backward. The spring II gives the push rod a forward thrust. A slot is provided at the rear end of the push rod and is clamped with the buckle II. The buckle II can limit the push rod at the rear end position. The buckle II can rotate and separate from the push rod slot. The push rod extends forward, and its front end contacts the traction rod. The electromagnetic tripping mechanism II includes a static iron core II, a moving iron core II, and a rotating plate. The static iron core II is fixedly connected to the vertical part of the connecting plate. The rotating plate is arranged in front of the static iron core II and is provided with a hinge shaft connected to the base. The rotating plate can rotate along the hinge shaft. The moving iron core II is fixedly provided on one side of the rotating plate. The rotating plate is fixedly provided with a knocking rod and a connecting rod. One end of the knocking rod is fixedly connected to the hinge shaft of the rotating plate. A trigger plate is fixedly provided on one side of the traction rod. The other end of the knocking rod is in active contact with the traction rod trigger plate. One end of the connecting rod is fixedly connected to the hinge shaft, and the other end is connected to the base through a spring III.
[0006] The electromagnetic tripping mechanism I also includes a tripping device housing, which is fixedly connected to the bracket I. A slide groove is provided at the upper end. The push rod is limited in the slide groove and can move forward and backward. The push rod is connected to the slide groove through a spring II. The front end of the slide groove is open, which can facilitate the extension of the front end of the push rod. A notch is provided at the lower end of the slide groove to facilitate the contact between the slot at the lower end of the push rod and the buckle II.
[0007] Under the action of torsion spring I, the buckle I of the rotating shaft rod contacts the upper end of the moving iron core I, and the moving iron core I is in an upward and lifted state along the hinge point. When the static iron core I generates a strong magnetic field, it will attract the lower part of the moving iron core I, and the moving iron core I will overcome the action of spring I and rotate downward. The lower part of the moving iron core I is attracted to the upper end of the static iron core I, and its upper end will push the buckle I. The buckle I overcomes the action of torsion spring I of the rotating shaft rod and drives the rotating shaft rod to flip. The rotating shaft rod is engaged with the gear at the lower end of the buckle II through the gear structure. The flipping of the rotating shaft rod drives the buckle II to flip in the opposite direction. The buckle II unlocks the connection with the push rod, and the push rod extends forward under the action of spring II, touches the traction rod and flips.
[0008] Buckle II is hinged to the release housing. A clamping head is provided at the front end of buckle II and a gear is provided at the lower end. The clamping groove at the rear end of the push rod is arrow-shaped. When the push rod is pressed into the slide groove, the arrow of the clamping groove contacts the clamping head of buckle II and presses the clamping head down. The push rod continues to penetrate into the slide groove, and the clamping head of buckle II is engaged with the clamping groove to limit the position of the push rod. When the rotating shaft rod rotates to drive buckle II to flip, the clamping head and the clamping groove are unfastened, and the push rod extends to the front end under the action of spring II.
[0009] When the static iron core II generates a strong enough magnetic field, the static iron core II attracts the moving iron core II, the rotating plate rotates to overcome the tension of the spring III, and the knocking rod contacts the trigger plate of the traction rod, thereby completing the tripping operation.
[0010] The static iron core I and the back protection static iron core II are designed on the same main conductor connecting plate and arranged in perpendicular directions to each other.
[0011] The traction rod is provided with a hollow hole, and a re-buckle reset plate is provided at the hole. The re-buckle reset plate includes a plate body and a long strip push plate at the upper end. The lower end of the plate body is hinged to the base. The re-buckle reset plate is provided with a spring IV to give the plate body a reset pulling force. In the natural state, the push plate is away from the front end of the push rod. When the handle is manually re-buckled to open the gate, one end of the arc-shaped part integrally connected to the handle will contact and press down the plate body, and the push plate rotates with the plate body. The end of the push plate will pass through the hole of the traction rod and contact the end of the push rod, pressing the push rod into the slide groove, and the push rod slot is engaged with the buckle II; when the handle leaves the opening position, the push plate is reset with the plate body.
[0012] The front end of the push rod is an arc-shaped surface. The left half of the arc-shaped surface contacts the push plate that passes through the hole of the traction rod. The push rod can be pressed back into the slide groove. The right half of the arc-shaped surface is in active contact with the traction rod. After the push rod is unfastened from the slide groove (the buckle II is separated from the slot), its front end contacts and pushes the traction rod to flip, triggering the tripping.
[0013] The beneficial effects of the present invention are as follows: when a short circuit fault occurs in the circuit, the electromagnetic instantaneous tripping mechanism will respond to the fault. The protection function iron core and the backup protection iron core are on the same main conductor and arranged perpendicularly to each other. This design can enable them to more effectively sense the changes in the current in the main conductor, thereby improving the detection sensitivity and accuracy of the trip device for different types of faults. The two cooperate with each other to jointly complete the comprehensive protection of the circuit, ensuring that the circuit can be cut off in time under various fault conditions to protect the safety of electrical equipment and lines. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic diagram of the structure of the connecting plate; Figure 3 is a schematic diagram of the structure of the rotating plate; Figure 4 This is a structural diagram of the reset plate; Figure 5 Schematic diagram of the push rod structure.
[0015] 1-base, 2-connecting plate, 3-traction rod, 4-static iron core I, 5-moving iron core I, 6-rotating shaft rod, 7-bracket I, 8-static iron core II, 9-buckle I, 10-moving iron core II, 11-rotating plate, 12-push rod, 13-knocking rod, 14-trigger plate, 15-connecting rod, 16-spring III, 17-slot, 18-arc surface, 19-clamp head, 20-gear, 21-handle, 22-arc part, 23-plate body, 24-push plate, 31-horizontal part, 32-vertical part. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0017] A plastic case circuit breaker with a dual-core protective release comprises a base 1 and a cover. The base is provided with a handle 21 and a drawbar 3. Rotation of the drawbar 3 triggers the release of the re-arrest mechanism, thereby achieving tripping of the operating mechanism. This is prior art, and the related structure and operation process are not further described. The circuit breaker outlet is provided with an L-shaped main conductor connection plate, which includes a horizontal portion 31 and a vertical portion 32. The base 1 is provided with a dual-core electromagnetic trip device, which includes an electromagnetic trip mechanism I and an electromagnetic trip mechanism II: The electromagnetic tripping mechanism I includes a static iron core I4, a moving iron core I5, a bracket I7, a rotating shaft rod 6, and a push rod 12. The bracket I7 is fixedly arranged above the transverse portion 31. The static iron core I4 is fixedly connected to the transverse portion 31. When the transverse portion passes through current, the static iron core I4 including the static iron core II8 will generate a magnetic field. The moving iron core I is an L-shaped plate, which is arranged above the static iron core I and in front of the bracket I. The lower end thereof is hinged to the lower end of the bracket I. The moving iron core I is connected to the bracket I through a spring I. The spring I gives the moving iron core I an upward pull. The rotating shaft rod is arranged above the moving iron core I. The push rod 12 is arranged horizontally above the rotating shaft rod, which is perpendicular to the rotating shaft rod 6. The push rod 12 is connected to the rotating shaft rod 6 and can be displaced forward and backward. The spring II gives the push rod a forward thrust. The rear end of the push rod 12 is provided with a slot 17 and is engaged with the buckle II. The buckle II can limit the push rod 12 to the rear end position. The buckle II can rotate and separate from the push rod slot 17. The push rod extends forward and its front end contacts the traction rod 3. The electromagnetic tripping mechanism II includes a static iron core II8, a moving iron core II10, and a rotating plate 11. The static iron core II8 is fixedly connected to the vertical part of the connecting plate 2. The rotating plate is arranged in front of the static iron core II and is provided with a hinge shaft connected to the base. The rotating plate can rotate along the hinge shaft. The side of the rotating plate 11 close to the static iron core II is fixedly provided with a moving iron core II10. The rotating plate is fixedly provided with a knocking rod 13 and a connecting rod 15. One end of the knocking rod 13 is fixedly connected to the hinge shaft of the rotating plate. A trigger plate is fixedly provided on one side of the traction rod 3. The other end of the knocking rod is in active contact with the traction rod trigger plate 14. One end of the connecting rod 15 is fixedly connected to the hinge shaft, and the other end is connected to the base through a spring III.
[0018] The electromagnetic tripping mechanism I also includes a tripper housing, which is fixedly connected to the bracket I7. A slide groove is provided at the upper end. The push rod 12 is limited in the slide groove and can move forward and backward. The push rod 12 is connected to the slide groove through a spring II. The front end of the slide groove is open, which can facilitate the extension of the front end of the push rod. A notch is provided at the lower end of the slide groove to facilitate the contact between the slot at the lower end of the push rod and the buckle II.
[0019] Under the action of torsion spring I, the buckle I9 of the rotating shaft rod 6 contacts the upper end of the moving iron core I5, and the moving iron core I is in an upward and lifted state along the hinge point. When the static iron core I generates a strong magnetic field, it will attract the lower part of the moving iron core I, and the moving iron core I will overcome the action of spring I and rotate downward. The lower part of the moving iron core I is attracted together with the upper end of the static iron core I, and its upper end will push the buckle I. The buckle I overcomes the action of torsion spring I of the rotating shaft rod and drives the rotating shaft rod to flip. The rotating shaft rod is engaged with the gear 20 at the lower end of the buckle II through the gear structure. The flipping of the rotating shaft rod drives the buckle II to flip in the opposite direction. The buckle II unlocks the connection with the push rod, and the push rod extends forward under the action of spring II, touching the traction rod to flip.
[0020] Buckle II is hinged to the release housing, and a clamping head 19 is provided at the front end of buckle II and a gear 20 is provided at the lower end. The clamping groove at the rear end of the push rod is arrow-shaped. When the push rod 12 is pressed into the slide groove, the arrow of the clamping groove contacts the clamping head 19 of buckle II and presses the clamping head down. The push rod continues to penetrate into the slide groove, and the clamping head 19 of buckle II is engaged with the clamping groove 17 to limit the position of the push rod. When the rotating shaft rod rotates to drive the buckle II to flip, the clamping head 19 and the clamping groove 17 are unfastened, and the push rod extends to the front end under the action of spring II.
[0021] When the static iron core II8 generates a strong enough magnetic field, the static iron core II8 attracts the moving iron core II 10, the rotating plate 11 rotates to overcome the tension of the spring III, and the knocking rod 13 contacts the trigger plate 14 of the traction rod, thereby completing the tripping operation.
[0022] The traction rod 3 is provided with a hollow gap, and a re-buckle reset plate is provided at the gap. The re-buckle reset plate includes a plate body 23 and a long strip push plate 24 at the upper end. The lower end of the plate body 23 is hinged to the base, and the re-buckle reset plate is provided with a spring IV to give the plate body 23 a reset pulling force. In the natural state, the push plate 34 is away from the front end of the push rod 12. When the handle 21 performs a manual re-buckle opening action, one end of the arc-shaped portion 22 integrally connected to the handle will contact and press down the plate body, and the push plate 24 rotates with the plate body 23. The end of the push plate will pass through the traction rod gap and contact the end of the push rod, pressing the push rod 12 into the slide groove, and the push rod slot 17 is engaged with the buckle II; when the handle leaves the opening position, the push plate is reset with the plate body.
[0023] The front end of the push rod is an arc-shaped surface. The left half of the arc-shaped surface contacts the push plate that passes through the hole of the traction rod. The push rod can be pressed back into the slide groove. The right half of the arc-shaped surface is in active contact with the traction rod. After the push rod is unfastened from the slide groove (the buckle II is separated from the slot), its front end contacts and pushes the traction rod to flip, triggering the tripping.
[0024] The operating current value of electromagnetic trip mechanism I is between 8in and 12in, the rated current value of the circuit breaker. The operating current value of backup protection electromagnetic trip mechanism II is between 18in and 20in, the rated current value. This parameter setting can be differentiated by adjusting the performance specifications of spring I and spring III. In the event of a short circuit in the distribution line, electromagnetic trip mechanism I takes precedence over backup electromagnetic trip mechanism II. Only if electromagnetic trip mechanism I fails will backup electromagnetic trip mechanism II be activated, achieving the purpose of dual protection.
[0025] The static iron core I of the instantaneous protection release and the static iron core II of the backup protection release are arranged on the main conductor connection plate III, forming a 90° vertical layout. When a large current flows through the molded case circuit breaker with a double-core release through a short-circuit fault, the magnetic fields generated do not interfere with each other, ensuring the operating accuracy within the short-circuit tripping current range.
[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.
Claims
1. A plastic case circuit breaker with a double iron core protection release, comprising a base and a cover, wherein the base is provided with a traction rod, and is characterized in that: The outgoing end of the circuit breaker is provided with an L-shaped main conductor connection plate, which includes a horizontal part and a vertical part. The base is provided with a double-core electromagnetic trip device, which includes an electromagnetic trip mechanism I and an electromagnetic trip mechanism II: The electromagnetic tripping mechanism I includes a static iron core I, a moving iron core I, a bracket I, a rotating shaft rod, and a push rod. The bracket I is fixedly arranged above the horizontal portion, the static iron core I is fixedly connected to the horizontal portion, the moving iron core I is an L-shaped plate, which is arranged above the static iron core I and in front of the bracket I. The lower end thereof is hinged to the lower end of the bracket I. The moving iron core I is connected to the bracket I through a spring I, and the spring I gives the moving iron core I an upward pulling force. The rotating shaft rod is arranged above the moving iron core I and can rotate, and is connected to a torsion spring I. The rotating shaft rod is fixed with a buckle I, the upper end of the moving iron core I is in active contact with the buckle I, the upper end of the rotating shaft rod is clamped with the push rod through the buckle II, the push rod is horizontally arranged above the rotating shaft rod, and is perpendicular to the rotating shaft rod. It is connected with a spring II, and the push rod can be displaced forward and backward. The spring II gives the push rod a forward thrust. A slot is provided at the rear end of the push rod and is clamped with the buckle II. The buckle II can limit the push rod at the rear end position. The buckle II can rotate and separate from the push rod slot. The push rod extends forward, and its front end contacts the traction rod. The electromagnetic tripping mechanism II includes a static iron core II, a moving iron core II, and a rotating plate. The static iron core II is fixedly connected to the vertical part of the connecting plate. The rotating plate is arranged in front of the static iron core II and is provided with a hinge shaft connected to the base. The rotating plate can rotate along the hinge shaft. The moving iron core II is fixedly provided on one side of the rotating plate. The rotating plate is fixedly provided with a knocking rod and a connecting rod. One end of the knocking rod is fixedly connected to the hinge shaft of the rotating plate. A trigger plate is fixedly provided on one side of the traction rod. The other end of the knocking rod is in active contact with the traction rod trigger plate. One end of the connecting rod is fixedly connected to the hinge shaft, and the other end is connected to the base through a spring III.
2. The plastic case circuit breaker with double iron core protection release according to claim 1, characterized in that: The electromagnetic tripping mechanism I also includes a tripping device housing, which is fixedly connected to the bracket I. A slide groove is provided at the upper end. The push rod is limited in the slide groove and can move forward and backward. The push rod is connected to the slide groove through a spring II. The front end of the slide groove is open, which can facilitate the extension of the front end of the push rod. A notch is provided at the lower end of the slide groove to facilitate the contact between the slot at the lower end of the push rod and the buckle II.
3. The plastic case circuit breaker with double iron core protection release according to claim 2, characterized in that: Under the action of torsion spring I, the buckle I of the rotating shaft rod contacts the upper end of the moving iron core I, and the moving iron core I is in an upward and lifted state along the hinge point. When the static iron core I generates a strong magnetic field, it will attract the lower part of the moving iron core I, and the moving iron core I will overcome the action of spring I and rotate downward. The lower part of the moving iron core I is attracted to the upper end of the static iron core I, and its upper end will push the buckle I. The buckle I overcomes the action of torsion spring I of the rotating shaft rod and drives the rotating shaft rod to flip. The rotating shaft rod is engaged with the gear at the lower end of the buckle II through the gear structure. The flipping of the rotating shaft rod drives the buckle II to flip in the opposite direction. The buckle II unlocks the connection with the push rod, and the push rod extends forward under the action of spring II, touches the traction rod and flips.
4. The plastic case circuit breaker with a double iron core protection release according to claim 2, characterized in that: Buckle II is hinged to the release housing. A clamping head is provided at the front end of buckle II and a gear is provided at the lower end. The clamping groove at the rear end of the push rod is arrow-shaped. When the push rod is pressed into the slide groove, the arrow of the clamping groove contacts the clamping head of buckle II and presses the clamping head down. The push rod continues to penetrate into the slide groove, and the clamping head of buckle II is engaged with the clamping groove to limit the position of the push rod. When the rotating shaft rod rotates to drive buckle II to flip, the clamping head and the clamping groove are unfastened, and the push rod extends to the front end under the action of spring II.
5. The plastic case circuit breaker with double iron core protection release according to claim 1, characterized in that: The static iron core I and the back protection static iron core II are designed on the same main conductor connecting plate and arranged in perpendicular directions to each other.
6. The plastic case circuit breaker with a double iron core protection release according to claim 2, characterized in that: The traction rod is provided with a hollow hole, and a re-buckle reset plate is provided at the hole. The re-buckle reset plate includes a plate body and a long strip push plate at the upper end. The lower end of the plate body is hinged to the base. The re-buckle reset plate is provided with a spring IV to give the plate body a reset pulling force. In the natural state, the push plate is away from the front end of the push rod. When the handle is manually re-buckled to open the gate, one end of the arc-shaped part integrally connected to the handle will contact and press down the plate body, and the push plate rotates with the plate body. The end of the push plate will pass through the hole of the traction rod and contact the end of the push rod, pressing the push rod into the slide groove, and the push rod slot is engaged with the buckle II; when the handle leaves the opening position, the push plate is reset with the plate body.
7. The plastic case circuit breaker with double iron core protection release according to claim 6, characterized in that: The front end of the push rod is an arc surface, the left half of the arc surface contacts the push plate passing through the hole of the traction rod, the push rod can be pressed back into the slide groove, and the right half of the arc surface is in active contact with the traction rod.