CN114678239B - Moving side contact assembly of direct current breaker and direct current breaker - Google Patents
Moving side contact assembly of direct current breaker and direct current breaker Download PDFInfo
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- CN114678239B CN114678239B CN202111601673.9A CN202111601673A CN114678239B CN 114678239 B CN114678239 B CN 114678239B CN 202111601673 A CN202111601673 A CN 202111601673A CN 114678239 B CN114678239 B CN 114678239B
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- 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
- H01H73/18—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/38—Driving mechanisms, i.e. for transmitting driving force to the contacts using spring or other flexible shaft coupling
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- 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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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to the technical field of direct current circuit breakers, in particular to a movable side arc striking structure of a direct current circuit breaker, and provides a movable side contact assembly of the direct current circuit breaker and the direct current circuit breaker. The moving side contact assembly of the direct current breaker comprises a moving main contact and a moving arc contact, wherein the moving arc contact is hinged to one end of the moving main contact, which is used for contacting with a fixed contact of the direct current breaker, and a conductive connection structure for bearing arc striking current is arranged between the moving side contact and the moving main contact; the movable arc contact is provided with an arc striking contact corresponding to a movable side arc striking inclined plane of the direct current breaker when the switch is opened so as to transfer the electric arc to the movable side arc striking inclined plane, an elastic piece for driving the movable arc contact to swing towards a fixed contact of the direct current breaker is arranged between the movable main contact and the movable arc contact, and the movable arc contact is further provided with a front swing limiting structure for limiting the swing angle of the movable arc contact towards the fixed contact of the direct current breaker.
Description
Technical Field
The invention relates to the technical field of direct current circuit breakers, in particular to a movable side arc striking structure of a direct current circuit breaker.
Background
The main stream of the arc extinguishing chamber of the 1800V direct current circuit breaker is a single main contact structure, such as the circuit breaker introduced in the patent document of the prior art CN 110504117B, and the circuit breaker comprises a moving contact arranged on a circuit breaker main body, wherein a front arc striking row is arranged above the moving contact and used for guiding an arc on the moving contact to the arc extinguishing structure above the circuit breaker main body. Because a large amount of electric arcs can be generated when the moving contact and the fixed contact are switched on, the electric arcs ablate the moving contact, and under long-term conditions, the moving contact is seriously damaged, so that the current passing capability of the fixed contact is reduced. In order to improve the ablation resistance of the main contact, silver-oxide (generally silver-cadmium oxide) with stronger ablation resistance is generally used as a main contact material, and the silver-oxide belongs to non-environment-friendly substances and is opposite to the growing environment-friendly demands at home and abroad, but the main contact made of environment-friendly materials at present generally does not have the ablation resistance meeting the actual demands of engineering.
In order to solve the problem that the material of the main contact and the ablation resistance of the main contact are contradictory, SF in the prior art 6 The circuit breaker is that one end that is close to the stationary main contact at the inside moving main contact of explosion chamber sets up the moving arc contact, and the moving arc contact compares in moving main contact and is close to the stationary end of explosion chamber, when carrying out the divide-shut brake, the moving arc contact is before moving main contact and stationary end contact to break off with the stationary end after moving main contact and stationary end, on leading the arc that produces when the divide-shut brake between moving main contact and the stationary end to the moving arc contact, through the mode of striking, reduced the demand of moving main contact against the ablation ability, and then make the moving main contact can adopt the material that the ablation resistance is weaker relatively, and more environmental protection.
But the above-mentioned arc striking mode is based on SF 6 The moving main contact in the breaker is translationalThe switching-on and switching-off modes are not matched with the mode that the moving main contact switches on and off in a swinging mode. Of course, for a moving main contact for switching on and off in a swinging mode, a moving arc contact and a moving main contact can be connected through a conductive spring, the moving arc contact is connected with a static end before the moving main contact under the action of the conductive spring, and the moving main contact is disconnected after being disconnected so as to lead an electric arc generated by switching on and off to the moving arc contact. However, in order to ensure the effective transmission of the conductive spring, a telescopic space of the conductive spring must be reserved in the arc-extinguishing chamber, which results in a larger size of the arc-extinguishing chamber, and for the arc-extinguishing chamber with fixed intervals between the components in the arc-extinguishing chamber, the conductive spring is difficult to fit and install; and the movable main contact and the movable arc contact need to bear larger arc striking current, the performance cannot be realized through simple plug-in matching, and if the movable main contact and the movable arc contact are provided with conductive contact fingers, flexible extension and retraction of the movable main contact are difficult to ensure.
Disclosure of Invention
The invention aims to provide a movable side contact assembly of a direct current breaker, which solves the technical problem that the ablation resistance of a movable main contact in the prior art is contradictory with environmental protection materials. The invention also provides a direct current breaker, which solves the technical problem that the ablation resistance of the moving main contact in the prior art is inconsistent with the environment-friendly material.
In order to achieve the above purpose, the technical scheme of the moving side contact assembly of the direct current breaker provided by the invention is as follows: the movable side contact assembly of the direct current breaker comprises a movable main contact and a movable arc contact, wherein the movable arc contact is hinged to one end of the movable main contact, which is used for being contacted with a fixed contact of the direct current breaker, and a conductive connection structure for bearing arc striking current is arranged between the movable arc contact and the movable main contact; the movable arc contact is provided with an arc striking contact corresponding to a movable side arc striking inclined plane of a movable side arc striking row of the direct current breaker when the switch is opened so as to transfer an electric arc to the movable side arc striking inclined plane, an elastic piece for driving the movable arc contact to swing towards the fixed contact is arranged between the movable main contact and the movable arc contact, and a front swing limiting structure for limiting the swing angle of the movable arc contact towards the fixed contact is also arranged, wherein the front swing limiting structure is used for enabling the movable arc contact to be kept at a position closer to the fixed contact relative to the movable main contact so as to form an arc striking; the moving arc contact also has a pressing part for pressing against a reverse-pushing block on the DC breaker main body when opening the switch, so that the moving arc contact swings backwards to transfer the arc from the arc striking contact to the arc striking inclined surface on the moving side.
The beneficial effects are that: according to the movable side contact assembly of the direct current breaker, the elastic piece drives the movable arc contact to swing forwards all the time in the closing process of the movable main contact, so that the movable arc contact can reach the limit of the swinging pole under the effect of the limit structure before closing, and the movable arc contact can be ensured to be connected with the fixed contact of the arc extinguishing chamber before the movable main contact is disconnected with the fixed contact; compared with the prior art, the movable arc contact is not only capable of leading the generated electric arc to the movable arc contact during switching on and switching off to avoid ablation of the main contact, but also hinged to the movable main contact in a relatively swinging mode, large space is not required to be reserved in the direct current breaker, installation is convenient, meanwhile, the movable arc contact is not required to bear normal working current, the flow guiding of the normal working current is not influenced even if ablation is generated, silver-oxide materials which are easy to cause pollution during manufacturing are not required, and environmental protection is good.
As a further improvement, the conductive connection structure is a flexible connection.
The beneficial effects are that: under the condition of ensuring good through flow, the soft connection is also softer in material and convenient to install.
As a further improvement, an avoidance groove is formed in the end face, facing the fixed contact, of the movable arc contact, one end of the flexible connection is arranged in the avoidance groove and connected with the movable main contact through a screw, and the other end of the flexible connection is connected with the movable arc contact through a screw.
The beneficial effects are that: the soft connection is in the avoidance groove, so that the soft connection is prevented from being exposed outside too much, and the influence of electric arcs on the conductive effect of the soft connection is reduced.
As a further improvement, the elastic member is a torsion spring.
The beneficial effects are that: the direction of elastic compression and elastic deformation recovery of the torsion spring is in the circumferential direction, so that the requirement for space during installation of the elastic piece is reduced, and the circumferential space of the existing moving main contact is fully utilized.
As a further improvement, in the extending direction of the swing axis of the moving main contact, a torsion spring rotating shaft is arranged on the side surface of the moving main contact, the torsion spring is sleeved on the torsion spring rotating shaft, and one end of the torsion spring is fixedly connected to the moving main contact; the movable arc contact comprises a contact mounting part provided with the arc striking contact and a driving part which is L-shaped with the contact mounting part and extends towards the rear, and the other end of the torsion spring is propped against the driving part.
The beneficial effects are that: the torsional spring rotates the suit in the torsional spring pivot, and the one end fixed connection of torsional spring is on moving main contact, and the other end drives the swing of moving arc contact when the torsional spring rotates, is favorable to make full use of the rotation stroke of torsional spring, and then is favorable to guaranteeing to be in the moving arc contact when the swing is extremely spacing and is close to the static contact of explosion chamber more.
As a further improvement, one of the movable arc contact and the movable main contact is provided with an arc hole, the other is provided with a limiting pin, and the limiting pin is in stop fit with the front end of the arc hole to form the front swing limiting structure.
The beneficial effects are that: the arc hole and the limiting pin are matched to form a front swing limiting structure, so that the structure is simplified under the condition that the moving arc contact can be limited, and the production cost is reduced.
The technical scheme of the direct current breaker provided by the invention is as follows: the direct current breaker comprises a static end and a moving end, wherein the static end is provided with a static contact and a static side conductor, the static contact is connected to the static side conductor, the moving end is provided with a moving side contact assembly and a moving side conductor, the static side conductor is connected with a static side arc striking row, the moving side conductor is connected with a moving side arc striking row, the static side arc striking row and the moving side arc striking row are used for dragging an arc generated during opening and closing, the moving side contact assembly comprises a moving main contact and a moving arc contact, the moving arc contact is hinged to one end of the moving main contact, which is used for contacting with the static contact of the direct current breaker, and a conductive connecting structure used for bearing an arc striking current is arranged between the moving main contact; the movable arc contact is provided with an arc striking contact corresponding to a movable side arc striking inclined plane of a movable side arc striking row of the direct current breaker when the switch is opened so as to transfer an electric arc to the movable side arc striking inclined plane, an elastic piece for driving the movable arc contact to swing towards the fixed contact is arranged between the movable main contact and the movable arc contact, and a front swing limiting structure for limiting the swing angle of the movable arc contact towards the fixed contact is also arranged, wherein the front swing limiting structure is used for enabling the movable arc contact to be kept at a position closer to the fixed contact relative to the movable main contact so as to form an arc striking; the moving arc contact also has a pressing part for pressing against a reverse-pushing block on the DC breaker main body when opening the switch, so that the moving arc contact swings backwards to transfer the arc from the arc striking contact to the arc striking inclined surface on the moving side.
The beneficial effects are that: according to the direct current breaker provided by the invention, the elastic piece in the moving contact assembly drives the moving arc contact to swing forwards all the time in the closing process of the moving main contact, so that the moving arc contact can reach the limit of the swinging pole under the effect of the limit structure before closing, and the moving arc contact can be ensured to be connected with the fixed contact of the arc extinguishing chamber before the moving main contact and the fixed contact are disconnected; compared with the prior art, the movable arc contact is not only capable of leading the generated electric arc to the movable arc contact during switching on and switching off to avoid ablation of the main contact, but also hinged to the movable main contact in a relatively swinging mode, large space is not required to be reserved in the direct current breaker, installation is convenient, meanwhile, the movable arc contact is not required to bear normal working current, the flow guiding of the normal working current is not influenced even if ablation is generated, silver-oxide materials which are easy to cause pollution during manufacturing are not required, and environmental protection is good.
As a further improvement, the conductive connection structure is a flexible connection.
The beneficial effects are that: under the condition of ensuring good through flow, the soft connection is also softer in material and convenient to install.
As a further improvement, an avoidance groove is formed in the end face, facing the fixed contact, of the movable arc contact, one end of the flexible connection is arranged in the avoidance groove and connected with the movable main contact through a screw, and the other end of the flexible connection is connected with the movable arc contact through a screw.
The beneficial effects are that: the soft connection is in the avoidance groove, so that the soft connection is prevented from being exposed outside too much, and the influence of electric arcs on the conductive effect of the soft connection is reduced.
As a further improvement, the elastic member is a torsion spring.
The beneficial effects are that: the direction of elastic compression and elastic deformation recovery of the torsion spring is in the circumferential direction, so that the requirement for space during installation of the elastic piece is reduced, and the circumferential space of the existing moving main contact is fully utilized.
As a further improvement, in the extending direction of the swing axis of the moving main contact, a torsion spring rotating shaft is arranged on the side surface of the moving main contact, the torsion spring is sleeved on the torsion spring rotating shaft, and one end of the torsion spring is fixedly connected to the moving main contact; the movable arc contact comprises a contact mounting part provided with the arc striking contact and a driving part which is L-shaped with the contact mounting part and extends towards the rear, and the other end of the torsion spring is propped against the driving part.
The beneficial effects are that: the torsional spring rotates the suit in the torsional spring pivot, and the one end fixed connection of torsional spring is on moving main contact, and the other end drives the swing of moving arc contact when the torsional spring rotates, is favorable to make full use of the rotation stroke of torsional spring, and then is favorable to guaranteeing to be in the moving arc contact when the swing is extremely spacing and is close to the static contact of explosion chamber more.
As a further improvement, one of the movable arc contact and the movable main contact is provided with an arc hole, the other is provided with a limiting pin, and the limiting pin is in stop fit with the front end of the arc hole to form the front swing limiting structure.
The beneficial effects are that: the arc hole and the limiting pin are matched to form a front swing limiting structure, so that the structure is simplified under the condition that the moving arc contact can be limited, and the production cost is reduced.
As a further improvement, the movable side arc striking row comprises a movable side row body, and one end of the movable side row body is embedded with an ablation-resistant block.
The beneficial effects are that: the movable side arc striking row is installed in a blocking mode, and on the premise of achieving arc striking, manufacturing difficulty of the movable side arc striking row is reduced, and ablation resistance of the movable side arc striking row is improved.
As a further improvement, the moving end of the direct current breaker is provided with a reverse-pushing stop block on the swing stroke of the moving arc contact, so that the side surface of the moving arc contact is aligned with the moving side arc striking row when the switch is opened.
The beneficial effects are that: the side surface of the movable arc contact is aligned with the movable side arc striking row when the brake is opened by the reverse-pushing stop block, so that better arc striking is facilitated, and the movable arc contact is prevented from striking the movable side conductor.
As a further improvement, the static side arc striking row and/or the movable side arc striking row are/is fixed with connecting blocks which are detachably fixed on corresponding conductors, so that the static side arc striking row and/or the movable side arc striking row can be independently detached.
The beneficial effects are that: the static side arc striking row and/or the movable side arc striking row are/is installed in a blocking mode, and on the premise of achieving arc striking, manufacturing difficulty of the arc striking row is reduced, and connection with corresponding conductors is facilitated.
Drawings
Fig. 1 is a schematic diagram of a dc circuit breaker according to the present invention;
FIG. 2 is an assembled schematic view of a stationary conductor, stationary contact, and stationary arcing row;
FIG. 3 is a schematic diagram of an assembly of a stationary side conductor and a stationary contact;
FIG. 4 is a schematic view of the static side arc striking row in FIG. 2;
fig. 5 is a schematic structural view of a movable side arc striking row;
FIG. 6 is an assembled schematic view of a movable side arcing row and a connecting row;
fig. 7 is a schematic structural view of the moving main contact;
FIG. 8 is a schematic diagram of a moving arcing contact;
FIG. 9 is a schematic view of the structure of the moving-side contact assembly;
fig. 10 is a schematic diagram of a state of the dc breaker when the dc breaker is closed;
fig. 11 is a schematic diagram of a state of the dc breaker when the dc breaker is opened.
Reference numerals illustrate: 1. a breaker main body; 2. an operating mechanism; 3. a movable side arc striking row; 4. static side arc striking rows; 5. a reverse pushing stop block; 6. a moving main contact; 7. a moving arc contact; 8. a stationary contact; 9. a static side conductor; 10. a movable side conductor; 11. a stationary side row body; 12. a static side connecting block; 13. avoidance holes; 14. a movable side row body; 15. a movable-side connecting block; 16. a connection row; 17. a torsion spring; 18. soft connection; 19. an arc contact structure; 20. a third rotation shaft hole; 21. a torsion spring rotating shaft; 22. an arc-shaped hole; 23. a limiting pin; 24. a first rotation shaft hole; 25. a pin hole; 26. a second rotation shaft hole; 27. a fixing hole; 28. a torsion spring rotating shaft; 29. avoiding the groove.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that in the present embodiment, relational terms such as "first" and "second" and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" or the like, as may occur, does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the depicted element.
In the description of the present invention, unless explicitly stated and limited otherwise, terms such as "mounted," "connected," and "connected" may be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
The present invention is described in further detail below with reference to examples.
Example 1 of a dc breaker provided in the present invention:
as shown in fig. 1, the dc circuit breaker includes a circuit breaker body 1 and an operating mechanism 2, and a stationary end and a moving end of the dc circuit breaker are mounted on the circuit breaker body 1. The operating mechanism 2 is connected to the breaker main body 1 and is used for driving the moving end to switch on and off, and an arc extinguishing grid plate (not shown) is further arranged at the top of the breaker main body 1 and is used for performing arc extinguishing operation on an arc generated during switching on and off of the moving end and the static end.
The static end of the direct current breaker is provided with a static contact 8 and a static side conductor 9, the static side conductor 9 is connected to the breaker main body 1, the static side conductor 9 is provided with a static side arc striking row 4, and the static contact 8 is connected with the static side conductor 9 and the static side arc striking row 4. Specifically, as shown in fig. 2 to 4, the fixed contact 8 has an L-shaped structure, the fixed contact 8 includes a transverse section and a vertical section, the transverse section is fixedly connected to the lower side of the fixed side conductor 9, the vertical section is located at one side of the fixed side conductor 9 facing the movable side conductor 10, and the top of the vertical section is provided with a bolt mounting hole; the static side arc striking row 4 comprises a static side row body 11 and a static side connecting block 12, one end of the static side row body 11 is provided with the static side connecting block 12 to be connected, the static side connecting block 12 is of a right trapezoid block structure and is used for being welded at the end part of the static side row body 11, the static side connecting block 12 is provided with an avoidance hole 13, the bottom hole wall of the avoidance hole 13 is provided with a threaded hole penetrating through the bottom of the static side connecting block 12, when the static side arc striking row 4 is connected, the static side row body 11 is installed on the top side surface of the static side conductor 9, and bolts are inserted into the threaded holes of the static side connecting block 12 through bolt installation holes on the vertical section of the static contact 8 so as to connect the static side connecting block 12 on the static contact 8. Grooves (not shown) are provided on the inclined sides of the static connection block 12, and block-shaped structures with high ablation resistance are mounted in the grooves during manufacture to form static arc striking inclined planes.
The movable end of the direct current circuit breaker is provided with a movable side contact assembly and a movable side conductor 10, the movable side conductor 10 is connected to the circuit breaker main body 1, a movable side arc striking row 3 is arranged on the movable side conductor 10, and the movable side arc striking row 3 is used for being matched with a static side arc striking row 4 to guide an arc generated during opening and closing to an arc extinguishing grid plate.
As shown in fig. 5 and 6, the movable side arc striking row 3 includes a movable side row body 14, a movable side connecting block 15 and a connecting row 16, one end of the movable side row body 14 is connected with the movable side connecting block 12, the movable side connecting block 12 is of a right triangle block structure, the top of the movable side connecting block 15 is detachably connected to the movable side row body 14, the bottom of the movable side connecting block 15 is connected with the movable side conductor 10 through the connecting row 16, specifically, the connecting row 16 is of a Z-shaped structure, screw mounting holes are formed in the top and bottom of the connecting row 16, a mounting groove is formed in the bottom of the movable side connecting block 15, the top of the connecting row 16 is clamped into the mounting groove and connected with the movable side connecting block 15 through screws, and the bottom of the connecting row 16 is connected with the movable side conductor 10 through screws, so that the movable side connecting block 15 is connected to the movable side conductor 10. The side surface of the movable side connecting block 14 facing the fixed contact 8 is provided with a groove, and an ablation-resistant block is arranged in the groove to form a movable side arc striking inclined plane.
The movable side contact assembly comprises a movable main contact 6 and a movable arc contact 7, an elastic piece is arranged between the movable main contact 6 and the movable arc contact 7, and the elastic piece drives the movable arc contact 7 to swing relative to the movable main contact 6.
As shown in fig. 7, the moving main contact 6 has a plate-like structure as a whole, and one side of the moving main contact is provided with a closing plane for contacting with the fixed contact 8; the surface of the moving main contact 6 is provided with a contact rotating shaft hole, the moving main contact 6 can be connected with the operating mechanism 2 in a transmission way through the hole, and the operating mechanism 2 drives the moving main contact to swing. The top of the moving main contact 6 is provided with a first rotating shaft hole 24 for the installation of a hinge shaft, and a second rotating shaft hole 26 is arranged below the first rotating shaft hole 24 for the installation of a bullet-shaped piece.
As shown in fig. 8, the movable arcing contact 7 has an L-shaped plate-like structure as a whole, and includes a contact mounting portion and a driving portion which are arranged in order from top to bottom. The transition part of the contact mounting part and the driving part is provided with a third rotating shaft hole 20, and the moving arc contact 7 is sleeved on the hinge shaft on the moving main contact 6 through the third rotating shaft hole 20, so that the moving arc contact 7 can swing around the hinge shaft relative to the moving main contact 6. The third rotating shaft hole 20 is provided with a countersunk head end, after the movable arc contact 7 is sleeved on the hinge shaft, fixing structures such as a clamp spring are installed at the countersunk head end, and the movable arc contact 7 is prevented from falling off. An arc contact structure 19 is arranged on the side of the contact mounting part of the movable arc contact 7, which faces the fixed contact 8, and the movable arc contact 7 is communicated with the fixed contact 8 through the arc contact structure 19 as an arc striking contact. The bottom side of the driving part is an arc-shaped side and is used for being connected with the elastic piece. The rear end face of the moving arc contact 7 is provided with an avoidance groove 29, the avoidance groove 29 is internally provided with a flexible connection 18, the flexible connection 18 is used as a conductive connection structure, one end of the flexible connection 18, which is positioned in the avoidance groove 29, is connected with the moving main contact 6 through a screw, and the other end of the flexible connection 18 is connected with the moving arc contact 7 through a screw.
In this embodiment, the elastic member is a torsion spring 17, the torsion spring 17 is connected between the moving main contact 6 and the moving arc contact 7, specifically, as shown in fig. 7 and 9, a fixing hole 27 is provided on the moving main contact 6 obliquely below the second pivot hole 26, the fixing hole 27 is specifically provided at a position far away from the fixed contact 8 than the second pivot hole 26, and during installation, a torsion spring pivot 28 is installed on the second pivot hole 26, the torsion spring 17 is sleeved on the torsion spring pivot 28, and a countersunk end is provided on the side surface of the moving main contact 6, and by installing a positioning structure such as a snap spring at the countersunk end, the torsion spring 17 is prevented from falling out. One end of the torsion spring 17 is connected in the fixed hole 27, and the other end of the torsion spring 17 abuts against the arc-shaped side surface of the bottom end of the driving part of the moving arc contact 7 to drive the moving arc contact 7 to swing, so that the arc-shaped contact structure 19 on the moving arc contact 7 is closer to the fixed contact 8 than the closing plane of the moving main contact 6.
In order to avoid overlong brake opening time caused by overlarge swing amplitude of the moving arc contact 7, as shown in fig. 7 to 9, a pin hole 25 is arranged on the moving main contact 6 and obliquely below the first rotating shaft hole 24, the pin hole 25 is arranged at a position far away from the fixed contact 8 than the first rotating shaft hole 24, and a limiting pin 23 is arranged in the pin hole 25; an arc hole 22 is formed in the moving arc contact 7, the arc hole 22 is a long hole, when the moving arc contact 7 is installed on the moving main contact 6, the limiting pin 23 penetrates through the arc hole 22, and when the moving arc contact 7 swings, the limiting pin 23 is blocked on inner hole walls at two ends of the arc hole 22, so that the moving arc contact 7 does not swing continuously any more, and limiting on the swinging stroke of the moving arc contact 7 is achieved. The front end of the arc-shaped hole 22 is in stop fit with the limiting pin 23 to form a front swing limiting structure.
The corner between the moving side conductor 10 and the breaker main body 1 is also provided with a reverse pushing stop 5, as shown in fig. 9 and 11, the rear end face of the driving part of the moving arc contact 7 forms a jacking part, and the jacking part pushes the moving arc contact 7 in an un-closed state to drive, so that the moving arc contact 7 swings towards the torsion spring 17 in a direction opposite to the swinging direction of the moving arc contact 7, and the plane of the arc contact structure 19 of the moving arc contact 7 is aligned with the moving side arc striking inclined plane of the moving side arc striking row 3.
When the direct current breaker is switched on, as shown in fig. 10, the operating mechanism 2 drives the moving main contact 6 to swing towards the fixed contact 8, the torsion spring 17 drives the moving arc contact 7 to swing towards the fixed contact 8 in the process that the moving arc contact 7 is far away from the reverse thrust block 5, and after the moving arc contact 7 is far away from the reverse thrust block 5, the torsion spring 17 drives the moving arc contact 7 to continue to swing until the limiting pin 23 arranged on the moving main contact 6 is blocked with the rear end hole wall of the arc hole 22, the moving arc contact 7 reaches forward swing limit, and the moving arc contact 7 does not swing relative to the moving main contact 6. At this time, the arc contact structure 19 of the moving arc contact 7 is closer to the fixed contact 8 than the moving arc contact 7, under the condition that the operating mechanism 2 continues to drive the moving main contact 6 to swing, the moving main contact 6 continues to drive the moving arc contact 7 to be close to the fixed contact 8, after the arc contact structure 19 of the moving arc contact 7 contacts the fixed side arc striking row 4, under the thrust action of the fixed side arc striking row 4, the moving arc contact 7 starts to swing in the opposite direction, and the torsion spring 17 is elastically compressed until the moving main contact 6 contacts with the fixed contact 8, and then closing is completed. Because the arc contact structure 19 of the moving arc contact 7 is close to the static side arc striking row 4 before the moving main contact 6, the periphery of the moving arc contact 7 can generate electric arcs in the closing process, and the electric arcs on the moving main contact are prevented from generating ablation.
When the direct current breaker is opened, as shown in fig. 11, the operating mechanism 2 drives the main contact 6 to swing reversely, after the moving main contact 6 is gradually far away from the fixed contact 8, the torsion spring 17 gradually recovers the elastic deformation of the main contact, and in the process of recovering the elastic deformation of the torsion spring 17, the moving arc contact 7 is driven to swing towards the fixed contact 8 relative to the moving main contact 6, so that the arc contact structure 19 on the moving arc contact 7 and the static side arc striking row 4 can still keep contact for a certain time, and the moving main contact 6 can be separated from the fixed contact 8 in advance. When the arc contact structure 19 is separated from the static side arc striking row 4, an electric arc is generated between the movable arc contact 7 and the static contact 8, and the electric arc passive side arc striking row 3 and the static side arc striking row 4 are led to the metal grid plate to be gradually extinguished. When the moving main contact 6 drives the moving arc contact 7 to contact with the limiting block 5, the limiting block 5 overcomes the acting force of the torsion spring 17 to push the moving arc contact 7 to swing towards the moving side conductor 10 until the moving main contact 6 swings to the initial position, and then the brake is separated.
According to the direct current breaker provided by the invention, the elastic piece in the moving contact assembly drives the moving arc contact 7 to swing forwards all the time in the closing process of the moving main contact 6, so that the moving arc contact 7 can reach the limit of the swing pole under the effect of the limit structure before closing, and the moving arc contact 7 can be ensured to be connected with the fixed contact 8 of the arc extinguishing chamber before the moving main contact 6 is connected with the fixed contact 8, and then disconnected after the moving main contact 6 is disconnected with the fixed contact 8; and the electric conduction connection structure for bearing the striking current is further arranged between the moving arc contact 7 and the moving main contact 6, compared with the prior art, the electric arc generated during switching on and off can be led to the moving arc contact, the main contact is prevented from being ablated, the moving arc contact 7 is hinged to the moving main contact 6 in a relatively swinging mode, a large space is not required to be reserved in the direct current breaker, and the installation is convenient.
Example 2 of a dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the torsion spring 17 is sleeved on a rotating shaft installed below the movable arc contact 7. In this embodiment, the torsion spring 17 is directly sleeved on the hinge shaft for the hinge of the moving arc contact 7, and when in installation, one end of the torsion spring 17 is fixed with the moving arc contact 7, and the other end is fixed on the moving main contact 6.
Example 3 of the dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the moving arc contact 7 is provided with an arc hole 22, and the limiting pin 23 is mounted on the moving main contact 6. In the present embodiment, the limiting pin 23 is disposed on the moving arc contact 7, and the arc hole 22 is disposed on the moving main contact 6.
Example 4 of the dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, an arc hole 22 is provided on the moving arc contact 7, a limiting pin 23 is mounted on the moving main contact 6, and the arc hole 22 and the limiting pin 23 form a limiting structure. In this embodiment, the moving arc contact 7 and the moving main contact 6 are not provided with the arc hole 22 and the limiting pin 23, the moving main contact 6 is provided with two limiting blocks below the moving arc contact 7, the two limiting blocks are arranged at intervals and used for respectively stopping on the bottom arc side surface of the moving arc contact 7 when the moving arc contact 7 swings back and forth, and the two limiting blocks form a limiting structure.
Example 5 of the dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the movable-side arcing line 3 includes a movable-side line body 14 and a movable-side connection block 15 that are separately provided, and the movable-side conductor 10 is detachably connected to the movable-side connection block 12. In the present embodiment, the movable side arc striking bar 3 and the movable side conductor 10 are integrally formed.
Example 6 of the dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the static side arc striking bar 4 includes a static side bar body 11 and a static side connection block 12 which are separately arranged, and the static side conductor 9 is detachably connected with the static side connection block 12. In this embodiment, the static side arc striking row 4 and the static side conductor 9 are integrally formed.
Example 7 of the dc breaker provided in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the elastic member is a torsion spring 17. In this embodiment, the elastic member is a compression spring, specifically, a folded edge is disposed at the top end of the driving portion of the moving arc contact 7, and a compression spring is disposed between the folded edge and the top end of the moving main contact 6, and drives the moving arc contact 7 to swing.
The invention also provides an embodiment of the moving side contact assembly of the direct current breaker:
the structure of the moving-side contact assembly of the dc breaker in this embodiment is the same as that of the moving-side contact assembly in the above-mentioned dc breaker embodiment 1, and will not be described here again.
Of course, in other embodiments, the moving-side contact assembly of the dc breaker may also be the structure of the moving-side contact assembly in any of embodiments 2 to 7 of the dc breaker, which is not described herein again.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The movable side contact assembly of the direct current breaker is characterized by comprising a movable main contact (6) and a movable arc contact (7), wherein the movable arc contact (7) is hinged to one end of the movable main contact (6) for contacting with a fixed contact (8) of the direct current breaker, and a conductive connection structure for bearing arc striking current is arranged between the movable main contact (6); the movable arc contact (7) is provided with an arc striking contact corresponding to a movable side arc striking inclined plane of a movable side arc striking row (3) of the direct current breaker when the switch is opened so as to transfer a power supply arc to the movable side arc striking inclined plane, an elastic piece for driving the movable arc contact (7) to swing towards the fixed contact (8) is arranged between the movable main contact (6) and the movable arc contact (7), and a front swing limiting structure for limiting the swing angle of the movable arc contact (7) towards the fixed contact (8) is also arranged, wherein the front swing limiting structure is used for enabling the movable arc contact (7) to be kept at a position closer to the fixed contact (8) relative to the movable main contact (6) so as to form an arc; the moving arc contact (7) is also provided with a pressing part which is used for pressing against a reverse-pushing stop block (5) on the direct-current breaker main body when the switch is opened so that the moving arc contact (7) swings backwards to transfer an arc from the arc striking contact to the arc striking inclined surface on the moving side.
2. The moving side contact assembly of a direct current circuit breaker according to claim 1, characterized in that the electrically conductive connection structure is a flexible connection (18).
3. The movable side contact assembly of the direct current breaker according to claim 2, wherein an avoidance groove (29) is formed in the end face, facing the fixed contact (8), of the movable arc contact (7), one end of the flexible connection (18) is located in the avoidance groove (29) and is in screw connection with the movable main contact (6), and the other end of the flexible connection (18) is in screw connection with the movable arc contact (7).
4. A moving-side contact assembly of a direct current circuit breaker according to claim 1 or 2 or 3, characterized in that the elastic member is a torsion spring (17).
5. The movable side contact assembly of the direct current breaker according to claim 4, wherein a torsion spring rotating shaft (28) is arranged on the side surface of the movable main contact (6) in the extending direction of the swing axis of the movable main contact (6), the torsion spring (17) is sleeved on the torsion spring rotating shaft (28), and one end of the torsion spring (17) is fixedly connected to the movable main contact (6); the movable arc contact (7) comprises a contact mounting part provided with the arc striking contact and a driving part which is L-shaped with the contact mounting part and extends towards the rear, and the other end of the torsion spring (17) is propped against the driving part.
6. A moving-side contact assembly of a direct current breaker according to claim 1, 2 or 3, wherein one of the moving arc contact (7) and the moving main contact (6) is provided with an arc hole (22), the other is provided with a limiting pin (23), and the limiting pin (23) is in stop fit with the front end of the arc hole (22) to form the front swing limiting structure.
7. The direct current breaker comprises a static end and a movable end, wherein the static end is provided with a static contact (8) and a static side conductor (9), the static contact (8) is connected to the static side conductor (9), the movable end is provided with a movable side contact component and a movable side conductor (10), the static side conductor (9) is connected with a static side arc striking row (4), the movable side conductor (10) is connected with a movable side arc striking row (3), and the static side arc striking row (4) and the movable side arc striking row (3) are used for dragging an arc generated during opening and closing; the moving-side contact assembly is the direct-current breaker according to any one of claims 1 to 6.
8. The direct current breaker according to claim 7, wherein the movable side arc striking bar (3) comprises a movable side bar body (14), and an ablation-resistant block is embedded and fixed at one end of the movable side bar body (14).
9. The direct current circuit breaker according to claim 7, characterized in that the moving end of the direct current circuit breaker is provided with a thrust back stop (5) on the swing stroke of the moving arcing contact (7) to align the side of the moving arcing contact (7) with the moving side arcing row (3) when opening the gate.
10. Direct current circuit breaker according to claim 7, characterized in that the static side arcing bars (4) and/or the moving side arcing bars (3) are fixed with connection blocks, which are detachably fixed on the corresponding conductors, so that the static side arcing bars (4) and/or the moving side arcing bars (3) can be detached individually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601673.9A CN114678239B (en) | 2021-12-24 | 2021-12-24 | Moving side contact assembly of direct current breaker and direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601673.9A CN114678239B (en) | 2021-12-24 | 2021-12-24 | Moving side contact assembly of direct current breaker and direct current breaker |
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| CN114678239A CN114678239A (en) | 2022-06-28 |
| CN114678239B true CN114678239B (en) | 2023-09-29 |
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| US5969314A (en) * | 1998-05-07 | 1999-10-19 | Eaton Corporation | Electrical switching apparatus having arc runner integral with stationary arcing contact |
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| CN114678239A (en) | 2022-06-28 |
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