CN110277255B - Circuit contact protection mechanism of circuit breaker - Google Patents
Circuit contact protection mechanism of circuit breaker Download PDFInfo
- Publication number
- CN110277255B CN110277255B CN201810220644.XA CN201810220644A CN110277255B CN 110277255 B CN110277255 B CN 110277255B CN 201810220644 A CN201810220644 A CN 201810220644A CN 110277255 B CN110277255 B CN 110277255B
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- connecting rod
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- circuit breaker
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- 230000007246 mechanism Effects 0.000 title claims abstract description 56
- 239000004020 conductor Substances 0.000 claims description 4
- 239000012212 insulator Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H2050/028—Means to improve the overall withstanding voltage, e.g. creepage distances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
- H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
- H01H2083/045—Auxiliary switch opening testing circuit in synchronism with the main circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
Landscapes
- Breakers (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a circuit contact protection mechanism of a circuit breaker. The circuit contact protection mechanism of the circuit breaker comprises a circuit, a moving contact, an actuating mechanism and a moving contact protection cover, wherein the actuating mechanism drives a first end of the moving contact to move so as to enable the first end to be in contact with or disconnected from the first contact. The actuating mechanism is linked with the moving contact protection cover and the first end respectively, when the first end is contacted with the first contact, the moving contact protection cover is positioned outside the contact part of the first end and the first contact, and when the first end and the first contact are gradually far away from and disconnected, the moving contact protection cover moves towards the space between the first end and the first contact and finally moves to the space between the first end and the first contact. The invention solves the technical problem that the contact points are broken down by high voltage due to insufficient clearance and creepage distance of the electric appliance under the condition of overhigh voltage.
Description
Technical Field
The invention relates to the field of circuit protection, in particular to a circuit contact protection mechanism of a circuit breaker.
Background
The arc fault detection circuit breaker is also a circuit protection device, called AFDD (arc fault detection devices for short), and has the main functions of detecting and distinguishing dangerous grounding arc faults, parallel arc faults and series arc faults and timely driving a device for breaking current to avoid electrical fire. The system adopts embedded system digital circuit control and an original arc characteristic identification algorithm, has small volume and strong function, integrates the leakage current protection function, realizes automatic monitoring and protection of fault arc and leakage current, and effectively ensures the safety of low-voltage distribution lines, electric equipment and personnel.
Two power supply modes are generally used for the circuit board design of the arc fault detection circuit breaker. Fig. 1 is a schematic diagram of a circuit connection structure of the circuit of the present invention. Specifically, a protection circuit for preventing a circuit board from being damaged in different power supply modes is disclosed in the circuit shown in fig. 1.
Disclosure of Invention
The circuit contact protection mechanism of the circuit breaker effectively solves the technical problem that in the prior art, due to the fact that the circuit contacts are too close, enough creepage distance cannot be guaranteed, and gaps of an electric appliance are likely to be broken down.
In an alternative embodiment, the present application provides a circuit breaker circuit contact protection mechanism including a first contact and a movable contact, and an actuator. The first contact is electrically connected to a circuit. The movable contact is a conductor used for connecting the first contact with other contacts on the circuit. The actuating mechanism drives the first end of the movable contact to move so that the first end is in contact with or disconnected from the first contact. The moving contact protection cover is an insulator, the actuating mechanism is respectively linked with the moving contact protection cover and the first end, when the first end is contacted with the first contact, the moving contact protection cover is positioned outside the contact part of the first end and the first contact, and when the first end is gradually far away from the first contact and disconnected, the moving contact protection cover moves towards the first end and between the first contacts and finally moves to the position between the first end and the first contacts.
Therefore, when the first contact and the moving contact are in contact or disconnected, the moving contact protective cover is driven by the actuating mechanism to form blocking between the first contact and the moving contact so as to prevent the first contact and the moving contact from being broken down by high voltage. On the other hand, the moving contact protection cover and the first end are linked by the actuating mechanism, so that the compactness of the mechanism design is improved.
In another alternative embodiment, the actuator includes a base and a drive member, and a first connecting rod. The base is provided with a first rail and a second rail, and the first end slides along the first rail to be in contact with or disconnected from the first contact. The driving piece slides along the second track. One end of the first connecting rod is rotatably connected with the driving piece, and the other end of the first connecting rod slides along the first track and is rotatably connected with the moving contact. The moving contact protection cover is provided with a third track so that the driving piece slides on the third track and is connected with the moving contact protection cover in a rotating mode, a first rotating shaft is arranged on the moving contact protection cover and arranged on the base so that the moving contact protection cover rotates along the first rotating shaft to form a lever mechanism, and the moving contact protection cover is provided with a protection cover to achieve linkage between the first end and the first contact when the first end and the first contact are far away from the lever mechanism. In the embodiment, a specific actuating mechanism structure and a linkage mode are provided.
In another optional embodiment, the actuator further includes an operating handle and a second connecting rod, the operating handle is provided with a second rotating shaft, and the second rotating shaft is disposed on the base and enables the operating handle to rotate along the second rotating shaft. One end of the second connecting rod is rotatably connected with the driving piece and slides along the second track, and the other end of the second connecting rod is rotatably connected with the operating handle and is arranged on one side of the second rotating shaft so that the second connecting rod and the operating handle form an eccentric wheel structure. This embodiment provides a specific structure of how the execution structure is linked with the operation handle.
In another optional embodiment, two ends of the first connecting rod are first connecting rod rotating shafts disposed along a radial direction of the first connecting rod, the first connecting rod rotating shafts at two ends of the first connecting rod are respectively used for being rotatably connected with the driving member and the movable contact, the first connecting rod rotating shaft rotatably connected with the movable contact is inserted into the first track, and the first track is a long hole. In this embodiment, a specific structure of the first connecting rod and a specific connection relationship between the first connecting rod and the driving member and the moving contact are provided.
In another optional implementation manner, the two ends of the second connecting rod are the second connecting rod rotating shafts arranged along the radial direction of the second connecting rod, the second connecting rod rotating shafts at the two ends of the second connecting rod are respectively used for being connected with the operating handle and the driving piece in a rotating manner, the second connecting rod rotating shafts connected with the driving piece in a rotating manner are inserted into the second track, and the second track is a long hole. The embodiment provides a specific structure of the second connecting rod and a specific connection relation between the second connecting rod and the operating handle and the driving piece.
In another alternative embodiment, the first contact includes an elastic connecting piece, one end of the elastic connecting piece is connected with the circuit, and the other end of the elastic connecting piece is an elastic telescopic end. In this embodiment, a specific structure of the first contact provided with the elastic connection piece is provided.
In another alternative embodiment, the movable contact protection cover is further provided with a first rotating shaft and a protection cover, and the first rotating shaft is arranged along the radial direction of the movable contact protection cover. The protective cover is arranged corresponding to the moving contact in shape, and the third track is arranged along the length direction of the moving contact protective cover. The embodiment provides a specific moving contact protection cover structure.
In another alternative embodiment, the third rail and the shield are disposed on both sides of the first rotating shaft. In this embodiment, a positional relationship between the third rail and the shield, and the first rotating shaft structure is provided.
In another alternative embodiment, the third rail is an elongated hole disposed along a length direction of the movable contact protection cover. A specific structure of the third rail is provided in this embodiment.
In another alternative embodiment, the protection shield is disposed at an end of the movable contact protection shield. The specific location where the shield is placed is provided in this embodiment.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a circuit connection structure of the circuit of the present invention;
fig. 2 is a schematic view of the internal structure of the circuit breaker when the moving contact is disconnected from the first contact according to the present invention;
fig. 3 is a schematic view of the internal structure of the circuit breaker when the moving contact of the present invention is in contact with the first contact;
fig. 4 is a partially enlarged schematic view of an assembly structure of a protection cover of a movable contact and a base according to the present invention;
fig. 5 is a schematic view of the moving contact of the present invention disconnected from the first contact;
fig. 6 is a schematic view of the moving contact of the present invention in contact with a first contact;
FIG. 7 is a schematic view of the layout of the first rail and the second rail on the base of the present invention;
fig. 8 is an external structural schematic diagram of a movable contact protection cover according to the present invention;
FIG. 9 is a schematic structural diagram of a first connecting rod according to the present invention;
FIG. 10 is a schematic structural view of a second connecting rod according to the present invention.
Wherein the reference numbers are as follows:
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout. In the drawings showing embodiments, the same last two digits indicate components that are identical in structure or similar in structure but have the same function.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings have only been schematically described or have only been labeled.
The applicant has found that a circuit board connection circuit with protection function is disclosed, as shown in fig. 1. Two power supply modes are provided for the design of the circuit breaker if only two switching contacts K1 and K2 are employed. In one of the power modes, the circuit board may be damaged by direct connection to the power system. The present application therefore also provides a way to add switch node K3 to solve the above problem. Meanwhile, the corresponding actuating mechanism 3 is also designed in the circuit breaker to solve the timing problem of the contact or disconnection of the switching nodes of K1, K2 and K3. The applicant has found, however, that the moving contacts are too close to the contacts and lack corresponding protection mechanisms to prevent the problem of breakdown by high voltage due to insufficient electrical clearance and creepage distance between the two.
Fig. 2 is a schematic view of an internal structure of the circuit breaker when the movable contact is disconnected from the first contact, and fig. 3 is a schematic view of an internal structure of the circuit breaker when the movable contact is in contact with the first contact. Fig. 4 is a partially enlarged schematic view of an assembly structure of a protection cover of a movable contact and a base according to the present invention. Fig. 5 is a schematic view of the moving contact of the present invention when disconnected from the first contact. Fig. 6 is a schematic view of the movable contact of the present invention in contact with the first contact.
In order to overcome the above disadvantages, as shown in fig. 2 to 6, the present application provides a circuit breaker circuit contact protection mechanism, which includes a circuit 1 and a movable contact 2, an actuator 3, and a movable contact protection cover 4. The first contact 11 is the closing contact of the K3 switch in the circuit 1, and the movable contact 2 is essentially a wire connecting the K2 and K3 contacts. Since it can be seen from fig. 1 that the two ends in contact with the movable contact 2 have the same electric potential, the actuator 3 drives the first end 31 of the movable contact 2 to move so as to make the first end 31 contact with or disconnect from the first contact 11, and the actuator 3 herein is not particularly limited, and only needs to drive the first end 31 of the movable contact 2 to contact with or disconnect from the first contact 11. Meanwhile, the actuator 3 is respectively linked with the movable contact protection cover 4 and the first end 31, and the actuator 3 moves the movable contact protection cover 4 to match with the first end 31 and the first contact 11 according to the motion relationship between the first end 31 and the second contact 11. When the first end 31 and the first contact 11 are disconnected, the movable contact protection cover 4 is blocked between the first end 31 and the first contact 11. The movable contact protection cover 4 is an insulator, so that the creepage distance between the first end 31 and the second contact 11 and the clearance of the electric appliance can reach the required safety distance, and the two are prevented from being broken down due to high voltage. When the first end 31 contacts with the second contact 11, the movable contact protection cover 4 does not obstruct the contact.
In order to make the technical scheme and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As further shown in fig. 2-6, in an alternative embodiment, the present application provides a circuit breaker circuit contact protection mechanism, which includes a circuit 1 and a movable contact 2, and an actuator 3 and a movable contact protection cover 4, wherein a first contact 11 is electrically connected to the circuit 1. The movable contact 2 is a conductor for connecting the first contact 11 with other contacts on the circuit 1. Said further contact is here denoted as contact of K2, of course with further improvements of the circuit 1 afterwards. And in addition, the method can be popularized to other contact connections. The actuator 3 drives the first end 31 of the movable contact 2 to move so that the first end 31 is in contact with or disconnected from the first contact 11. Actuating mechanism 3 except pure mechanical mechanism also can cooperate some mechanisms by electric drive, and moving contact safety cover 4 is the insulator, and actuating mechanism 3 links with moving contact safety cover 4 and first end 31 respectively, and specific linkage mode is: when the first end 31 contacts the first contact 11, the movable contact protection cover 4 is located outside the contact portion of the first end 31 and the first contact 11, and when the first end 31 and the first contact 11 are gradually separated and disconnected, the movable contact protection cover 4 moves between the first end 31 and the first contact 11, and finally moves between the first end 31 and the first contact 11. The technical scheme that the creepage distance and the electric appliance clearance between the first end 31 and the first contact 11 are ensured through the movable contact protection cover 4 is provided in the embodiment, and the movable contact protection cover 4 is linked with the original actuating mechanism 3, so that the secondary design of the movable contact protection cover 4 is simplified.
Fig. 7 is a schematic layout of the first rail and the second rail on the base according to the present invention. In an alternative embodiment, as shown in fig. 2 to 7, the actuator 3 comprises a base 5 and a drive member 6, and a first connecting rod 7. The base 5 is a general concept, and any component that can provide rigid support for the actuator 3 and other components can be understood as the base 5, and the specific structure and the number thereof are not limited herein. The base 5 is provided with a first rail 51 and a second rail 52, and the first end 31 slides along the first rail 51 to make or break the first end 31 contact with or break the first contact 11. Generally, the first contact 11 is designed as a fixed elastic contact, the driving member 6 slides along the second track 52, one end of the first connecting rod 7 is rotatably connected with the driving member 6, and the other end thereof slides along the first track 51 and is rotatably connected with the movable contact 2. The rotational connection here is preferably articulated. In a practical product, the actuator 3 and other components connected thereto are designed in a two-dimensional system. That is to say, it is understood that the actuator 3 and other components connected thereto are a link mechanism, but not limited to being designed in a two-dimensional system. Preferably, the first track 51 is an arc track, and the second track 52 is a straight track. The moving contact protection cover 4 is provided with a third rail 41 so that the driving element 6 slides on the third rail 41 and is rotationally connected with the moving contact protection cover 4, where the rotational connection can also be understood as a hinge connection, the moving contact protection cover 4 is provided with a first rotating shaft 42, the first rotating shaft 42 is provided on the base 5 so that the moving contact protection cover 4 rotates along the first rotating shaft 42 to form a lever mechanism, and the moving contact protection cover 4 is provided with a protection cover 43 to realize linkage between the first end 31 and the first contact 11 when the first end 31 is far away from the first contact 11. It should be noted that the design requirement of the present application can be met as long as the driving member 6 can slide up and down along the second rail 52 as required by the triggering device (i.e. the power device) of the actuator 3, and this embodiment provides a specific structure of the actuator 3 and discloses how the specific structure is linked with the movable contact protection cover 4. The linkage mode can be found to be a gradual mode according to the description of the above embodiment. That is, the movement of the movable contact protection cover 4 and the movement of the first end 31 and the first contact 11 are gradual processes, and the movable contact protection cover 4 (particularly, the protection cover 43 thereof) gradually moves to a contact portion between the first end 31 and the first contact 11 or away from the contact portion.
In another alternative embodiment, the actuator 3 further comprises an operating handle 8 and a second connecting rod 9, the operating handle 8 is provided with a second rotating shaft 81, and the second rotating shaft 81 is arranged on the base 5 and enables the operating handle 8 to rotate along the second rotating shaft 81. One end of the second connecting rod 9 is rotatably connected with the driving member 6 and slides along the second track 52, and the other end of the second connecting rod 9 is rotatably connected with the operating handle 8 and is disposed at one side of the second rotating shaft 81 so that the second connecting rod 9 and the operating handle 8 form an eccentric wheel structure. The rotary connection is also understood to mean an articulated connection, in the present embodiment a triggering mechanism of the actuator 3 and its corresponding mechanical mechanism are provided, which by means of the control of the operating handle 8 effects a sliding movement of the drive element 6.
Fig. 9 is a schematic structural diagram of a first connecting rod according to the present invention. As shown in fig. 10, in another alternative embodiment, two ends of the first connecting rod 7 are first connecting rod rotating shafts 71 disposed along a radial direction of the first connecting rod 7, the first connecting rod rotating shafts 71 at two ends of the first connecting rod 7 are respectively used for rotatably connecting with the driving element 6 and the movable contact 2, and the first connecting rod rotating shafts 71 rotatably connected with the movable contact 2 are inserted into the first tracks 51, and the first tracks 51 are long holes. The present embodiment provides a specific structure of the first connecting rod on the one hand, and further discloses how to realize the sliding of the movable contact 2 in the first track 51 while realizing the hinge joint. Because the rotating shaft 71 of the first connecting rod connected to the movable contact 2 acts therein both as a rotating shaft for the articulation and as a sliding block sliding in the first track 51.
FIG. 10 is a schematic structural view of a second connecting rod according to the present invention. In another alternative embodiment, as shown in fig. 10, the two ends of the second connecting rod 9 are second connecting rod rotating shafts 91 arranged along the radial direction of the second connecting rod 9, the second connecting rod rotating shafts 91 at the two ends of the second connecting rod 9 are respectively used for the rotating connection with the operating handle 8 and the driving member 6, and the second connecting rod rotating shafts 91 rotatably connected with the driving member 6 are inserted into the second tracks 52, and the second tracks 52 are long holes. The present embodiment provides a specific structure of the second connecting rod, and further discloses how the driving member 6 slides in the second track 52 while the hinge is realized, because the second connecting rod rotating shaft 91 connected to the driving member 6 serves as both the rotating shaft of the hinge and the sliding block sliding in the second track 52.
In another alternative embodiment, the first contact 11 includes an elastic connecting piece 111, and one end of the elastic connecting piece 111 is connected to the circuit 1, and the other end is an elastic telescopic end. In the present embodiment, the first contact 11 is a fixed elastic contact, but it needs to have a certain elasticity and is also laid for the following design. The basic principle and the working process of the circuit contact protection mechanism of the circuit breaker will be described in detail later, and the detailed description is omitted here.
Fig. 8 is an external structural schematic diagram of the movable contact protection cover of the present invention. In an alternative embodiment, as shown in fig. 8, the present application provides a specific structure of the movable contact protection cover, and the movable contact protection cover 4 is provided with a third rail 41 and a first rotating shaft 42, and a protection cover 43. The third track 41 is disposed along the length direction of the movable contact protection cover 4, the first rotating shaft 42 is disposed along the radial direction of the movable contact protection cover 4, and the protection cover 43 is disposed corresponding to the shape of the movable contact. In the present embodiment, the shield 43 is preferably an arc-shaped structure for shielding the first end 31 therein.
In another alternative embodiment, the third rail 41 and the shield 43 are disposed on both sides of the first rotation shaft 42. The design scheme of the embodiment is that when the middle of the lever mechanism is a fulcrum and two ends of the lever mechanism are displacement moving ends, the displacement change efficiency is highest.
In another alternative embodiment, the protection shield 43 is arranged at the end of the movable contact protection shield 4. Preferably, in the actual design process, the end provided with the protection cover 43 is a free end on the movable contact protection cover 4.
The working process and the basic principle of the circuit contact protection mechanism of the circuit breaker are as follows:
the working process and the basic principle of the protection mechanism are described in detail for this application. In the circuit 1 shown in fig. 1, L denotes live wire and N denotes neutral wire. K1, K2, and K3 respectively represent the three switching nodes of circuit 1 thereof. The structure of the circuit 1 corresponds exactly to the circuit in fig. 1. The main purpose of the circuit 1 is to supply power to the circuit board, and it should be noted that there is a corresponding switching sequence in addition to controlling the opening and closing of K1, K2 and K3. Specifically, at the time of contact closure, K2 closes later than K3 closes, and correspondingly, at the time of opening, K2 opens earlier than K3 opens. For the specific mechanism, as shown in fig. 2 to 4, the first contact 11 is a closed contact of the K3 switch, and the second contact 10 at the bottom in the figure is a closed contact of the K2 switch. Since the movable contact 2 is a conductor, it can be seen from the circuit 1 that the closed contact at the end of K3 and the closed contact at the end of K2 are at the same potential, so the movable contact 2 can be understood as a wire connected to N and connected in series with K3. In addition, the timing problem when connecting K2 and K3 is realized. The actuator 3 disclosed in fig. 2 to 6 is used, which actuator 3 is also extended in the present application. Except that the elastic structure of the first contact is changed to the elastic connection piece 111. When the first end 31 first touches the first contact 11, the second contact 10 is not connected to the movable contact 2. The actuator 3 will continue to push the first end 31 of the movable contact 2 to move toward the first contact 11, and at this time, because the first contact 11 is an elastic end, the first contact 11 will continue to contract to ensure that the second contact 10 contacts with the other end of the movable contact 2 to realize the timing requirement of energization. On the contrary, the second contact 10 is disconnected from the movable contact 2 first. Since the first contact 11 is an elastic end, the first end 31 of the movable contact 2 is not disconnected from the first contact 11 at this time, and as the movable contact 2 continues to move away along the first rail 51, the first end 31 is gradually separated from the first contact 11. In the process, the requirement on the time sequence is also met.
Under the condition of meeting the time sequence conditions, the movable contact protection cover 4 is introduced for the improvement. The movable contact protection cover 4 is linked with the actuating mechanism 3 through the third rail 41 arranged on the movable contact protection cover. Further improvement is achieved without substantially changing the structure of the original actuating mechanism 3. When the operating handle 8 rotates, it will rotate around the second rotating shaft 81, and due to the eccentric mechanism formed by the second connecting rod 9 and the operating handle 8, the second connecting rod 9 will drive the driving member 6 rotatably connected to the other end thereof to slide along the second track 52. During the sliding process of the driving element 6, the movable contact protection cover 4 is driven to swing along the first rotating shaft 42. In the process of swinging the movable contact protection cover 4, the positions of the first end 31 and the first contact 11 when the movable contact protection cover is contacted are arranged according to the swinging position of the protection cover 43 on the movable contact protection cover 4, so that the linkage effect is achieved. And the first end 31 will contact or disconnect the first contact 11 according to the sliding of the first connecting rod 7 in the first track 51. As regards the contact and disconnection manner of the movable contact 2 with the second contact 10.
The invention has the following beneficial effects:
a movable contact protection cover 4 is provided in the actuator 3. The moving contact protection cover 4 and the original actuating mechanism 3 generate linkage to block the space between the first contact 11 and the first end 31 when the two are disconnected, and further the design requirements of the two on creepage distance and electric appliance clearance are met.
A whole set of actuating mechanism 3 with a specific structure is specifically designed, and the time sequence requirements of the contact and disconnection of the first contact 11 and the second contact 10 of the moving contact 2 are still ensured after the moving contact protection cover 4 is arranged.
The elastic structure of the original first contact 11 is changed, and the structural design requirement of the actuating mechanism 3 on the first contact 11 is realized by adopting the elastic connecting sheet 111.
A concrete structure of a moving contact protection cover 4 is disclosed, so that the moving contact protection cover can meet the design requirement and is optimized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. Circuit breaker circuit contact protection mechanism, its characterized in that includes:
a first contact (11), said first contact (11) being electrically connected to a circuit (1); and
a movable contact (2), wherein the movable contact (2) is a conductor used for connecting the first contact (11) with other contacts on the circuit (1);
the actuating mechanism (3) drives the first end (31) of the movable contact (2) to move so that the first end (31) is in contact with or disconnected from the first contact (11);
a moving contact safety cover (4), moving contact safety cover (4) are the insulator and are provided with a protection casing (43), protection casing (43) with the appearance of moving contact (2) corresponds the setting, actuating mechanism (3) respectively with moving contact safety cover (4) with first end (31) linkage works as first end (31) with during first contact (11) contact, moving contact safety cover (4) are located first end (31) with outside first contact (11) contact site, work as first end (31) with when the disconnection is progressively kept away from to first contact (11), moving contact safety cover (4) to first end (31) with move between first contact (11) and finally move to first end (31) with between first contact (11).
2. Circuit breaker circuit contact protection mechanism according to claim 1, characterized in that the actuator (3) comprises:
a base (5), wherein a first rail (51) and a second rail (52) are arranged on the base (5), and the first end (31) slides along the first rail (51) to make the first end (31) contact with or break the first contact (11); and
a driving member (6), said driving member (6) sliding along said second track (52);
one end of the first connecting rod (7) is rotatably connected with the driving piece (6), and the other end of the first connecting rod (7) slides along the first track (51) and is rotatably connected with the moving contact (2);
be provided with third track (41) on moving contact safety cover (4) so that driving piece (6) are in slide on third track (41) and with moving contact safety cover (4) rotate and are connected, be provided with a first pivot (42) on moving contact safety cover (4), first pivot (42) set up on base (5) so that moving contact safety cover (4) are followed first pivot (42) are rotatory to form lever mechanism, moving contact safety cover (4) are provided with protection casing (43) and are realized first end (31) with first contact (11) move when keeping away from extremely first end (31) with linkage between first contact (11).
3. The circuit breaker circuit contact protection mechanism of claim 2 wherein said actuator (3) further comprises:
the operating handle (8) is provided with a second rotating shaft (81), the second rotating shaft (81) is arranged on the base (5), and the operating handle (8) rotates along the second rotating shaft (81);
a second connecting rod (9), the one end of second connecting rod (9) with driving piece (6) rotate to be connected and follow second track (52) slide, the other end of second connecting rod (9) with operating handle (8) rotate to be connected and set up in second pivot (81) one side is so that second connecting rod (9) with operating handle (8) form the eccentric wheel structure.
4. The circuit breaker circuit contact protection mechanism of claim 2,
the two ends of the first connecting rod (7) are provided with first connecting rod rotating shafts (71) arranged along the radial direction of the first connecting rod (7), the first connecting rod rotating shafts (71) at the two ends of the first connecting rod (7) are respectively used for being connected with the driving piece (6) and the movable contact (2) in a rotating mode, the first connecting rod rotating shafts (71) connected with the movable contact (2) in a rotating mode are inserted into the first tracks (51), and the first tracks (51) are long holes.
5. The circuit breaker circuit contact protection mechanism of claim 3,
the both ends of second connecting rod (9) are for following second connecting rod (9) radial direction sets up second connecting rod axis of rotation (91), second connecting rod (9) both ends second connecting rod axis of rotation (91) be used for respectively with operating handle (8) with the rotation of driving piece (6) is connected, and with driving piece (6) rotate to be connected second connecting rod axis of rotation (91) insert in second track (52), second track (52) are a slot hole.
6. Circuit breaker circuit contact protection mechanism according to claim 1, characterized in that said first contact (11) comprises:
and one end of the elastic connecting sheet (111) is connected with the circuit (1), and the other end of the elastic connecting sheet (111) is an elastic telescopic end.
7. Circuit breaker circuit contact protection mechanism according to claim 2, characterized in that said movable contact protection shield (4) is further provided with:
the first rotating shaft (42), the first rotating shaft (42) is arranged along the radial direction of the moving contact protection cover (4); and
the third rail (41), the third rail (41) sets up along the length direction of moving contact safety cover (4).
8. Circuit breaker circuit contact protection mechanism according to claim 7, characterized in that said third track (41) and said shield (43) are arranged on both sides of said first shaft (42).
9. The circuit breaker circuit contact protection mechanism of claim 7 wherein said third track (41) is an elongated hole along the length of said movable contact shield (4).
10. Circuit breaker circuit contact protection mechanism according to claim 7, characterized in that said protection shield (43) is arranged at the end of said movable contact protection shield (4).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810220644.XA CN110277255B (en) | 2018-03-16 | 2018-03-16 | Circuit contact protection mechanism of circuit breaker |
EP19162884.1A EP3540755B1 (en) | 2018-03-16 | 2019-03-14 | Circuit breaker circuit contact protection mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201810220644.XA CN110277255B (en) | 2018-03-16 | 2018-03-16 | Circuit contact protection mechanism of circuit breaker |
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CN110277255A CN110277255A (en) | 2019-09-24 |
CN110277255B true CN110277255B (en) | 2022-01-14 |
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CN201810220644.XA Active CN110277255B (en) | 2018-03-16 | 2018-03-16 | Circuit contact protection mechanism of circuit breaker |
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EP (1) | EP3540755B1 (en) |
CN (1) | CN110277255B (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412273A1 (en) * | 1984-04-02 | 1985-10-10 | Heinrich Kopp Gmbh & Co Kg, 8756 Kahl | Line protection circuit breaker having a differential-current trip device |
US20020105771A1 (en) * | 2001-02-02 | 2002-08-08 | Simms Kevin Anthony | Circuit breaker |
WO2002080329A1 (en) * | 2001-03-30 | 2002-10-10 | Pdl Holdings Limited | A compact circuit interuption device |
CN103594297A (en) * | 2012-08-14 | 2014-02-19 | 富士电机机器制御株式会社 | Circuit breaker |
CN107610987A (en) * | 2017-09-22 | 2018-01-19 | 嘉兴市加控电气设备制造有限公司 | A kind of miniature circuit breaker |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN206471297U (en) * | 2017-02-27 | 2017-09-05 | 哥伦电气有限公司 | A kind of miniature circuit breaker |
-
2018
- 2018-03-16 CN CN201810220644.XA patent/CN110277255B/en active Active
-
2019
- 2019-03-14 EP EP19162884.1A patent/EP3540755B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412273A1 (en) * | 1984-04-02 | 1985-10-10 | Heinrich Kopp Gmbh & Co Kg, 8756 Kahl | Line protection circuit breaker having a differential-current trip device |
US20020105771A1 (en) * | 2001-02-02 | 2002-08-08 | Simms Kevin Anthony | Circuit breaker |
WO2002080329A1 (en) * | 2001-03-30 | 2002-10-10 | Pdl Holdings Limited | A compact circuit interuption device |
CN103594297A (en) * | 2012-08-14 | 2014-02-19 | 富士电机机器制御株式会社 | Circuit breaker |
CN107610987A (en) * | 2017-09-22 | 2018-01-19 | 嘉兴市加控电气设备制造有限公司 | A kind of miniature circuit breaker |
Also Published As
Publication number | Publication date |
---|---|
EP3540755B1 (en) | 2024-02-14 |
CN110277255A (en) | 2019-09-24 |
EP3540755A1 (en) | 2019-09-18 |
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