CN112509856B - Contact coil for generating arc extinguishing magnetic field and vacuum arc extinguishing chamber contact structure - Google Patents
Contact coil for generating arc extinguishing magnetic field and vacuum arc extinguishing chamber contact structure Download PDFInfo
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- CN112509856B CN112509856B CN202011023693.8A CN202011023693A CN112509856B CN 112509856 B CN112509856 B CN 112509856B CN 202011023693 A CN202011023693 A CN 202011023693A CN 112509856 B CN112509856 B CN 112509856B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
- H01H33/6641—Contacts; Arc-extinguishing means, e.g. arcing rings making use of a separate coil
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a contact coil for generating an arc extinguishing magnetic field and a vacuum arc extinguishing chamber contact structure, wherein the contact coil comprises a coil body, the coil body comprises a conductive rod connecting part, an arc contact piece connecting part and a conductive flexible connection, one end of the conductive flexible connection is fixedly and conductively connected with the conductive rod connecting part, the other end of the conductive flexible connection is fixedly and conductively connected with the arc contact piece connecting part, the conductive flexible connection has a set deformation amplitude, when the conductive rod drives the conductive rod connecting end to move towards a direction far away from an arc contact, the conductive rod connecting end and the arc contact piece connecting end have a set maximum distance, and the size requirement of a fracture formed after a main contact piece at the end part of the conductive rod is separated from the arc contact piece is met. Through setting up electrically conductive flexible coupling, changed the structure of coil, the deformation of coil mainly is by the deformation range decision of electrically conductive flexible coupling, no longer relies on coil self material, conveniently forms great deformation range, can satisfy main contact blade and arc contact blade jumbo size fracture design requirement.
Description
Technical Field
The invention relates to a contact coil for generating an arc extinguishing magnetic field and a contact structure of a vacuum arc extinguishing chamber.
Background
Vacuum circuit breakers have become increasingly widely used in power distribution systems due to their environmentally friendly nature. The vacuum circuit breaker realizes the on-off of a circuit by depending on a vacuum arc extinguish chamber, and controls the on-off by depending on the matching of a moving contact and a static contact in the arc extinguish chamber.
Generally, when current flows through the contact, a magnetic field is generated, and acts on the electric arc to diffuse the electric arc, so that the aim of successfully switching off the current is fulfilled. For a vacuum arc-extinguishing chamber with a high voltage level, a large enough distance is needed to bear high voltage, but the magnetic field is reduced along with the increase of the distance, and a longitudinal magnetic field contact structure is a necessary structure to ensure that the magnetic field is sufficient under the large distance. Among the longitudinal magnetic field contact structures, the coil type contact structure is the most commonly used contact structure due to the characteristics of uniform magnetic field, high short-circuit current breaking capability and the like. At the level of 126kV, the current coil structure has 1/2 turn, 2/3 turn and 3/4 turn. The coil type contact structure mainly comprises a conductive rod, a coil, a contact support and a contact blade. The limitations of the coil-type structure are: the contact structure has long current path and large resistance, the rated current can not be very large, and the coil structure can have the current capacity of 2000A or 2500A. The national and foreign countries are basically in the same technical level. The U-shaped two-pole longitudinal magnetic field contact structure has strong longitudinal magnetic field, but the uniformity of the magnetic field is poor, and the contact area is only half of the contact area due to the two directions of the longitudinal magnetic field, so that the breaking capacity of short-circuit current is limited. Therefore, in the vacuum arc-extinguishing chamber with high voltage class, the capability of short-circuit breaking current and the current capability of rated current are a pair of typical contradictions, and the rated current of the contact structure with large breaking capability is not large, so that the application of the vacuum arc-extinguishing chamber in the high voltage field is limited.
The utility model discloses a vacuum interrupter contact device in chinese utility model patent that the publication number of granting is CN2805059Y, including conducting rod, coil and arc contact, the coil is contact coil, and coil circumference part is provided with a plurality of spiral gaps, forms the magnetic field that is used for the arc extinguishing when the coil circular telegram, and the one end of coil is fixed on the conducting rod, and the other end is together fixed with the arc contact, and the top that is located coil inside of conducting rod has set firmly main contact, fixes spacing dish on the main contact.
Under the switching-on state of the arc extinguish chamber, the main contact and the arc contact are pressed and conducted by contact pressure applied to two ends of a moving contact and a fixed contact of the arc extinguish chamber, and most rated current and expected short-circuit current flow through the arc extinguish chamber along the arc contact, the main contact and the conducting rod due to the fact that the main contact is large in conducting sectional area and short in conducting path, and the through-flow capacity of the arc extinguish chamber is improved. In the process of breaking the arc extinguishing chamber, along with the opening movement of the movable end contact, the pressure between the arc contacts of the two contacts disappears rapidly, under the action of strong electrodynamic force generated by short-circuit current, the main contact and the arc contacts are firstly broken, a fracture is generated between the main contact and the arc contacts, the port is formed by deformation generated by the arc contacts and the coil under the action of the electrodynamic force, the size of the port is determined by the main contact formed between the coil and the limiting disc, the short-circuit current is transferred into the coil due to the separation of the main contact and the arc contacts, and the current flowing through the coil generates a superposed longitudinal magnetic field in a gap between the two arc contacts, so that the arc is successfully broken. The main contact, the arc contact and the coil are arranged on the conducting rod, the main contact and the arc contact can form a fracture in the coil, and arc extinguishing operation is achieved through the coil, so that the contact structure can bear large rated current and can cut off the large rated current.
In the contact structure, a fracture between the main contact and the arc contact is mainly formed by the deformation of the arc contact and the coil, the coil is provided with a conductive rod connecting end and an arc contact piece connecting end, the conductive rod connecting end is electrically and fixedly connected with the conductive rod, the arc contact piece connecting end is electrically and fixedly connected with the arc contact, and when the conductive rod retreats away from the arc contact, the maximum distance between the conductive rod connecting end and the arc contact piece connecting end in the axial direction of the conductive rod determines the size of the fracture. And the maximum distance of conducting rod link and arc contact blade link is decided by the deformation range of coil, and the deformation of coil is because self material is made for softer copper processing on the one hand, and is out of shape easily, and on the other hand is because the gap that sets up on the coil, but this kind of deformation that relies on self material and gap can only form less fracture. The minor fracture has the problem that the fracture can not be completely broken in practical application, particularly when the main contact and the conducting rod are obliquely arranged due to hesitation of assembly problems, the main contact and the arc contact are not parallel, an included angle exists between the main contact and the arc contact, when the main contact retreats to form the fracture with the arc contact, the condition of local disconnection completion and local virtual connection which is still connected is easy to occur, current can not flow through the coil completely, the arc extinguishing performance of the coil can be greatly reduced, the disconnection and arc extinguishing of a vacuum arc extinguishing chamber are influenced, and great potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a contact coil for generating an arc extinguishing magnetic field, which aims to solve the technical problem that the fracture of a main contact and an arc contact is smaller due to smaller deformation of the contact coil mainly depending on the material and the gap of the contact coil in the prior art; meanwhile, the invention also aims to provide a contact structure of the vacuum arc-extinguishing chamber using the contact coil.
In order to achieve the above purpose, the technical solution of the contact coil for generating a magnetic blowout field provided by the present invention is: a contact coil for generating a switching magnetic field, comprising:
the coil body is used for generating an arc extinguishing magnetic field and comprises a conductive rod connecting part, an arc contact blade connecting part and a conductive flexible connection;
the conducting rod connecting part is provided with a conducting rod connecting end which is used for fixedly and conductively connecting with a corresponding conducting rod;
the arc contact blade connecting part is provided with an arc contact blade connecting end which is used for being fixedly and electrically connected with the corresponding arc contact blade;
the connecting end of the conducting rod and the connecting end of the arc contact blade are arranged at intervals along the vertical direction corresponding to the axial direction of the conducting rod;
one end of the conductive flexible connection is fixedly and conductively connected with the conductive rod connecting part, the other end of the conductive flexible connection is fixedly and conductively connected with the arc contact blade connecting part, the conductive flexible connection has a set deformation amplitude, when the conductive rod drives the conductive rod connecting end to move towards the direction far away from the arc contact, the conductive rod connecting end and the arc contact blade connecting end have a set maximum distance, and the size requirement of a fracture formed after the main contact blade at the end part of the conductive rod is separated from the arc contact blade is met.
The beneficial effects are that: according to the contact coil provided by the invention, the conductive flexible connection is arranged between the conductive rod connection part and the arc contact blade connection part, the conductive flexible connection can provide larger deformation amplitude, the conductive rod connection end and the arc contact blade connection end can have a set maximum distance when the conductive rod drives the main contact blade to retreat away from the arc contact blade, and the size requirement of a fracture formed after the main contact blade and the arc contact blade are separated is met. Through setting up electrically conductive flexible coupling, changed the structure of coil, the deformation of coil mainly is decided by the deformation range of electrically conductive flexible coupling, no longer relies on coil self material, conveniently forms great deformation range, can satisfy main contact blade and arc contact blade jumbo size fracture designing requirement.
As a further improvement, the coil body includes a central disk, the central disk has a central hole, the central hole serves as the connecting end of the conducting rod is welded to the conducting rod, the central disk is integrally connected with an upper circumferential coil section through a radial connecting arm, the upper circumferential coil section extends along the circumferential direction of the central disk, the upper circumferential coil section includes a front connecting portion, a conductive flexible connection and a rear connecting portion, one end of the conductive flexible connection is electrically and fixedly connected with the front connecting portion, the other end of the conductive flexible connection is electrically and fixedly connected with the rear connecting portion, the upper circumferential coil section is connected with a lower circumferential coil section through an inclined transition connecting section, the lower circumferential coil section extends along the circumferential direction of the central disk, the arc contact piece connecting end is arranged on the lower circumferential coil section, the central disk, the radial connecting arm and the front connecting portion constitute the connecting portion of the conducting rod, and the rear connecting portion, the inclined transition connecting section and the lower circumferential coil section constitute the contact arc piece connecting portion.
The beneficial effects are that: during normal installation, both ends of the conductive flexible connection are circumferential coil sections which are in the same plane, and the conductive flexible connection is convenient to install.
The technical scheme of the contact structure of the vacuum arc-extinguishing chamber provided by the invention is as follows:
a vacuum interrupter contact structure comprising:
a conductive rod extending in the vertical direction in the axial direction;
the main contact blade is fixedly arranged at the lower end of the conductive rod so as to form a main contact structure with the conductive rod;
the arc contact blade is positioned below the main contact blade and is connected with the conductive rod through a contact coil, and the arc contact blade, the contact coil and the conductive rod form an arc contact structure;
the contact coil is used for generating an arc extinguishing magnetic field, is sleeved at the lower end of the conducting rod, and is fixedly connected with the conducting rod in a conducting manner at one end and fixedly connected with the arc contact in a conducting manner at the other end;
the contact coil includes:
the coil body comprises a conductive rod connecting part, an arc contact blade connecting part and a conductive flexible connection;
the conducting rod connecting part is provided with a conducting rod connecting end which is fixedly connected with the conducting rod in a conducting way;
the arc contact blade connecting part is provided with an arc contact blade connecting end which is fixedly and electrically connected with the arc contact blade;
the conductive rod connecting end and the arc contact blade connecting end are arranged at intervals in the vertical direction;
the conductive flexible connection has a set deformation range, and when the conductive rod drives the conductive rod connecting end to move towards the direction far away from the arc contact blade, the conductive rod connecting end and the arc contact blade connecting end have a set maximum distance, so that the size requirement of a fracture formed after the main contact blade is separated from the arc contact blade is met.
The beneficial effects are that: in the contact structure of the vacuum arc extinguish chamber, the conductive rod and the main contact blade form a main contact structure, the conductive rod, the contact coil and the arc contact blade form an arc contact structure, a fracture can be formed by the main contact blade and the arc contact blade, and a magnetic field for arc extinction can be formed by the contact coil after the contact coil is electrified, so that the contact structure can meet the requirements of high current conduction and short-circuit high current breaking. And the conductive flexible connection is arranged between the conductive rod connecting part and the arc contact blade connecting part of the contact coil, the conductive flexible connection can provide larger deformation amplitude, and the conductive rod connecting end and the arc contact blade connecting end have the set maximum distance when the conductive rod drives the main contact blade to retreat away from the arc contact blade, so that the size requirement of a fracture formed after the main contact blade and the arc contact blade are separated is met. Through setting up electrically conductive flexible coupling, changed the structure of coil, the deformation of coil mainly is by the deformation range decision of electrically conductive flexible coupling, no longer relies on coil self material, conveniently forms great deformation range, can satisfy main contact blade and arc contact blade jumbo size fracture design requirement.
As a further improvement, the coil body includes a central disk, the central disk has a central hole, the central hole serves as the connecting end of the conducting rod is welded to the conducting rod, the central disk is integrally connected with an upper circumferential coil section through a radial connecting arm, the upper circumferential coil section extends along the circumferential direction of the central disk, the upper circumferential coil section includes a front connecting portion, a conductive flexible connection and a rear connecting portion, one end of the conductive flexible connection is electrically and fixedly connected with the front connecting portion, the other end of the conductive flexible connection is electrically and fixedly connected with the rear connecting portion, the upper circumferential coil section is connected with a lower circumferential coil section through an inclined transition connecting section, the lower circumferential coil section extends along the circumferential direction of the central disk, the arc contact piece connecting end is arranged on the lower circumferential coil section, the central disk, the radial connecting arm and the front connecting portion constitute the connecting portion of the conducting rod, and the rear connecting portion, the inclined transition connecting section and the lower circumferential coil section constitute the contact arc piece connecting portion.
The beneficial effects are that: during normal installation, both ends of the conductive flexible connection are circumferential coil sections which are in the same plane, and the conductive flexible connection is convenient to install.
As a further improvement, the lower circumferential coil section has a connecting projection which is arranged to project toward the arc contact blade, and the connecting projection is connected to the arc contact blade as the arc contact blade connecting end in a welding manner.
The beneficial effects are that: the connecting bulge is welded with the arc contact blade, so that the arc contact is convenient to process and manufacture.
As a further improvement, a spring element is arranged between the contact rod connecting part and the arcing contact blade, and the spring element is arranged between the contact rod connecting part and the arcing contact blade to exert a spring force for forcing the contact rod connecting part and the arcing contact blade away from each other.
The beneficial effects are that: the elastic element is arranged, so that elastic acting force which is far away from the connecting part of the conductive pole and the arc contact blade in a back-to-back mode can be applied, and switching between closing and opening of the main contact blade and the arc contact blade can be effectively guaranteed.
As a further improvement, the elastic element is an elastic corrugated pipe, and the elastic corrugated pipe is sleeved outside the conducting rod.
The beneficial effects are that: when the elastic corrugated pipe is adopted, not only can enough elastic acting force be provided, but also the main contact blade can be wrapped in the elastic corrugated pipe to form protection for the contact coil.
As a further improvement, a shielding barrel is fixedly arranged on the upper side surface of the arc contact blade facing the conductive rod, the shielding barrel is used for inserting the main contact blade and the conductive rod, the radial dimension of the main contact blade is larger than that of the conductive rod to form a flange, an inner blocking edge is arranged at the upper end of the shielding barrel, and the inner blocking edge is matched with the flange blocking when the conductive rod drives the main contact blade to move towards the direction far away from the arc contact blade so as to form a fracture with a set dimension between the main contact blade and the arc contact blade.
The beneficial effects are that: the arc contact pieces are provided with the shielding cylinders for the main contact pieces to be inserted, so that the main contact pieces are shielded, and the influence of micro-arcs possibly generated when the main contact pieces are separated from the contact pieces on the contact coils is avoided. And the inner blocking edge on the shielding barrel is matched with the flange on the main contact blade in a blocking way, so that the main contact blade is prevented from excessively retreating.
As a further improvement, a contact shielding cover is fixedly connected to the conductive rod, the contact shielding cover is arranged on the outer side of the contact coil, the lower end of the contact shielding cover is a supporting and jacking end, and when the conductive rod drives the main contact blade to move towards the arc contact blade to the main contact blade to be in conductive contact with the arc contact blade, the supporting and jacking end is in press fit with the supporting and jacking of the upper side face of the outer edge of the arc contact blade.
The beneficial effects are that: the contact shielding cover is covered outside the plug coil, so that effective protection can be formed. Moreover, when the main contact blade is in conductive contact with the arc contact blade, the supporting and jacking end of the contact shielding cover is in press fit with the supporting and jacking end on the upper side surface of the outer edge of the arc contact blade, so that the strength of the arc contact blade is effectively improved, and the service life of the arc contact blade is prolonged.
As a further improvement, the outer edge of the arc contact blade is provided with an arc flanging folded towards the conducting rod, and the upper side surface of the arc flanging is used for supporting and pressing fit with the supporting and pressing end.
The beneficial effects are that: the arc contact blade structure can be optimized by arranging the arc flanging, so that an electric arc between the moving contact and the fixed contact acts on the corresponding end part of the arc contact blade and cannot move backwards along the arc flanging.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a vacuum interrupter contact structure provided by the present invention;
fig. 2 is a schematic diagram of the contact coil of fig. 1.
Description of reference numerals:
1-conductive rod, 2-contact shield, 3-contact coil, 31-central disk, 32-lower circumferential coil section, 33-inclined transition connection section, 34-connection projection, 35-conductive flexible connection, 36-radial connection arm, 37-front connection section, 38-rear connection section, 4-elastic corrugated pipe, 5-arc contact piece, 6-shield cylinder, and 7-main contact piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that 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. Also, the terms "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, an element defined by the phrase "comprising a … …" does not exclude a process, method, or the like that includes the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art through specific situations.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art through specific situations.
The present invention is described in further detail below with reference to examples.
The invention provides a specific embodiment 1 of a contact structure of a vacuum arc-extinguishing chamber:
as shown in fig. 1 and 2, the contact structure of the vacuum interrupter in this embodiment mainly includes a conductive rod 1, a main contact blade 7, an arc contact blade 5, an elastic bellows 4, a shield cylinder 6, and a contact shield case 2.
The axial direction of conducting rod 1 extends from top to bottom, the lower extreme of conducting rod 1 is fixed and is provided with main contact blade 7 to form the main contact structure, the effect of main contact structure is that main contact blade 7 and arc contact blade 5 are closed back, main contact blade 7 and arc contact blade 5 reliable contact, the electric current is from conducting rod 1 direct flow through main contact blade 7 and arc contact blade 5, switch on the electric current return circuit. When the switch is normally closed, it is used to conduct the rated current. The conductive rod 1 is connected with the main contact blade 7 in a welding mode, the main contact blade 7 and the arc contact blade 5 are in reliable contact under the action of external pressure, the resistance of a conductive loop of the whole vacuum arc extinguish chamber is minimum, large rated current can be conducted, and the conductive rod is in an unreliable contact state when the external pressure is removed.
The radial dimension of the primary contact blade 7 is greater than the radial dimension of the conductive rod 1 for forming a flange for facilitating stop-and-stop engagement with the inner ledge at the upper end of the shielding canister 6.
An arc contact blade 5 is arranged below the conducting rod 1, the arc contact blade 5 is installed on the conducting rod 1 through a contact coil 3, and the conducting rod 1, the contact coil 3 and the arc contact blade 5 form an arc contact structure, namely, the main contact structure and the arc contact structure share the conducting rod 1. The function of the arc contact structure is to generate an arc extinguishing magnetic field when current flows through the contact coil 3, and the magnetic field acts on the electric arc to cut off the short-circuit current. The function of the arcing contact structure is to open and close the short circuit current and the peak current.
The contact coil 3 is provided with corresponding conductive coil sections, the conductive coil sections are used for generating arc extinguishing magnetic fields when being electrified, and the direction of the generated magnetic fields is determined by the trend of the conductive coil sections so as to determine whether a transverse magnetic field or a longitudinal magnetic field is generated.
In this embodiment, the contact coil 3 includes the coil main part, and the coil main part includes conducting rod connecting portion, arc contact piece connecting portion and electrically conductive flexible coupling 35, and the conducting rod connecting portion has the conducting rod link, and the conducting rod link is connected with 1 fixed electrically conductive of conducting rod, and arc contact piece connecting portion has arc contact piece link, and arc contact piece link is connected with 5 fixed electrically conductive of arc contact piece to, conducting rod link and arc contact piece link are arranged at interval in the upper and lower direction. The one end and the fixed electrically conductive connection of conducting rod coupling part of above-mentioned electrically conductive flexible coupling 35, the other end and the fixed electrically conductive connection of arc contact piece coupling part for the conducting rod link of contact coil 3 and the interval of arc contact piece link in upper and lower direction can change.
Specifically, the coil main body includes a central disk 31, two radial connecting arms 36, an upper circumferential coil section and a lower circumferential coil section 32, where the radial connecting arms 36, the upper circumferential coil section and the lower circumferential coil section 32 constitute the conductive coil sections of the contact coil, the radial connecting arms 36 are symmetrically arranged about the central disk 31, the radially inner end of each radial connecting arm 36 is integrally connected to the central disk 31, the radially outer end thereof is integrally connected to one upper circumferential coil section, and the upper circumferential coil section is integrally connected to the lower circumferential coil section 32 through an inclined transition connecting section 33, wherein the lower circumferential coil section is located below the upper circumferential coil section, the circumferential size of the upper circumferential coil section is about one fourth of the circumferential size of the contact coil, and the circumferential size of the lower circumferential coil section is about one half of the circumferential size of the contact coil.
In this embodiment, a central hole is disposed at the central position of the central disc 31, and the central hole is welded to the conductive rod 1, so that the central disc is used as a conductive rod connecting end to be fixedly connected to the conductive rod.
Go up the circumference coil section and include preceding connecting portion 37, electrically conductive soft joint 35 and back connecting portion 38, preceding connecting portion 37 and radial connecting arm 36 body coupling, back connecting portion 38 and slope transitional coupling section 33 body coupling, the electrically conductive fixed connection of one end and preceding connecting portion 37 of electrically conductive soft joint 35, the electrically conductive fixed connection of the other end and back connecting portion 38, so, begin to divide from electrically conductive soft joint 35, center panel 31, radial connecting arm 36, preceding connecting portion 37 constitutes the conducting rod connecting portion of coil main part, back connecting portion 38, slope transitional coupling section 33, circumference coil 32 constitutes the arc contact piece connecting portion of coil main part down, through the upper and lower dislocation deformation range at electrically conductive soft joint 35 both ends, can make center panel 31 and circumference coil 32 have great dislocation deformation range in upper and lower direction.
The conductive flexible connection can be made of thin copper foil, the surface of the copper foil is treated cleanly before welding, oil and oxidation do not exist, and pollution is prevented and oxidation is prevented when the conductive flexible connection is stored after welding.
In this embodiment, the lower circumferential coil section 32 has connecting projections 34, the connecting projections 34 are arranged to project toward the arcing contact blade 5, and the connecting projections 34 are welded to the arcing contact blade 5 as arcing contact blade connection ends, so that the arcing contact blade 5 is mounted on the conductive rod 1 via the contact coil 3.
The contact coil can be a 1/2 turn, 2/3 turn or 3/4 turn coil as a whole. The coil mainly has the function that a longitudinal magnetic field required by the on-off short-circuit current is generated when the current passes through the coil, and the conductive flexible connection mainly ensures that the contact coil 3 has certain flexibility, so that the main contact blade 7 and the arc contact blade 5 can be reliably contacted and closed, the through-current capacity of large rated current is ensured, and the size requirement of a fracture formed when the main contact blade 7 and the arc contact blade 5 are on-off is met.
And, set up the elastic element between central disc 31 and arc contact blade 5, the elastic element here is the elastic corrugated pipe 4, the elastic corrugated pipe 4 is fitted outside the conductive rod 1, the elastic corrugated pipe 4 locates between central disc and arc contact blade 5 in order to exert the elastic force forcing the two to be carried away from each other. When the external force is removed, the elastic corrugated pipe 4 releases elastic potential energy, so that the main contact blade 7 and the arc contact blade 5 are separated and disconnected to form a fracture. At this time, a current flows through the contact coil 3, generating a longitudinal magnetic field. In the overall design of the structure, the spring element is to be able to store a sufficiently large spring potential energy to be able to push the arcing contact blades 5 apart, ensuring that a predetermined breaking dimension is formed between the main contact blade 7 and the arcing contact blade 5.
In addition, a shielding cylinder 6 is fixedly welded on the upper side surface of the arc contact blade 5 facing the conducting rod 1, the shielding cylinder 6 is made of stainless steel, the conducting rod 1 and the main contact blade 7 are inserted, when the main contact blade 7 and the arc contact blade 5 are separated to form a fracture, in theory, the separated main contact blade 7 and the arc contact blade 5 are at the same potential, in actual conditions, when the fracture is formed in separation, loop resistance changes, a tiny electric arc may be generated between the main contact blade 7 and the arc contact blade 5, and the shielding cylinder 6 can play a role in shielding protection to avoid influencing the contact coil 3.
In addition, when the arc extinguish chamber is opened, in order to prevent the conductive rod 1 from excessively retreating with the central disc of the contact coil 3 to cause excessive deformation of the conductive flexible connection, an inner blocking edge is arranged at the upper end of the shielding cylinder 6 and is used for blocking and matching with a flange formed by the main contact blade 7. That is, when the contact rod 1 carries the movable contact blade 7 to move away from the arcing contact blade 5 to form a break of a set size between the main contact blade 7 and the arcing contact blade 5, the inner stop edge engages with the flange stop, after which the contact rod 1 will carry the main contact blade 7 and the arcing contact blade 5 together to move backwards, driving the arcing contact blade 5 to open, during which the conductive soft connection is not deformed any more.
In this embodiment, the arc contact blade 5 is usually provided with a radially extending gap to improve the arc extinguishing performance, the arc contact blade 5 is specifically welded to the connection protrusion of the contact coil 3, so as to form an arc contact structure with the conductive rod 1 and the contact coil 3, correspondingly, the main contact structure is located inside the arc contact structure, the main contact structure is connected in series with the arc contact structure, the main contact structure and the arc contact structure are connected by the elastic bellows 4, and the conductive rod 1 is shared by the main contact and the arc contact.
In order to protect the contact coil 3, a contact shielding case 2 is arranged outside the contact coil 3, the upper end of the contact shielding case 2 is welded on the conductive rod 1, the lower end of the contact shielding case has a supporting and jacking end, and when the conductive rod 1 drives the main contact blade 7 to move towards the arc contact blade 5 to the main contact blade 7 to be in conductive contact with the arc contact blade 5, the supporting and jacking end is in press fit with the upper side supporting and jacking on the outer edge of the arc contact blade 5. In the present embodiment, the outer edge of the arc contact blade 5 has an arc flange turned upward, and the upper side of the arc flange is used for supporting and abutting fit with the supporting and abutting end of the contact shield 2.
In the present exemplary embodiment, the contact coil 3 has a conductive flexible connection, so that the relative displacement range of the conductive rod connection end and the arcing contact blade connection end is greatly increased. Because the contact coil 3 is made of oxygen-free copper material, if the brazing connection is adopted, when the brazing temperature is 800 ℃, the conductive coil section loses elasticity, and the contact closing and separation switching of the main contact blade 7 and the arc contact blade 5 cannot be realized. And the elastic corrugated pipe 4 serving as an elastic element is arranged between the central disc and the arc contact blade 5, so that elastic acting force for separating the arc contact blade 5 from the main contact blade 7 can be effectively provided, and the switching of contact closing and separation of the main contact blade 7 and the arc contact blade 5 is reliably ensured. The flexible bellows 4 can be made of stainless steel to ensure good flexibility after high temperature brazing.
The vacuum interrupter contact structure that provides with this embodiment is applied to in the vacuum interrupter, and the moving contact and the static contact of vacuum interrupter all adopt the contact structure in this embodiment, and at vacuum interrupter minute brake in-process, when two contact blades of sound contact have not separated yet, conducting rod on the moving contact takes main contact 7 to retreat, and the main contact blade and the disconnection of arc contact blade of moving contact are in non-contact state, and at this moment, the electric current flows through arc contact blade, contact coil and conducting rod. After the two arc contact blades of the moving contact and the fixed contact are separated, an electric arc can be generated between the two arc contact blades, the electric arc is burnt and diffused on the arc contact blades under the action of a longitudinal magnetic field generated by the contact coil, and the electric arc is extinguished when the current crosses zero. In the switching-on process of the vacuum arc-extinguishing chamber, two arc contact blades of the moving contact and the fixed contact are firstly contacted and closed, then the main contact blade is contacted and closed with the arc contact blades under the action of external force, the current of the moving contact and the fixed contact is conducted through the conductive rod of the moving contact, the main contact blade of the moving contact, the arc contact blade of the fixed contact, the main contact blade of the fixed contact and the conductive rod of the fixed contact, and the resistance is small, so that the high current can be borne. The arc extinguish chamber contact can meet the requirement of high breaking capacity of short-circuit current and the requirement of high rated current through-flow capacity, and the application range of the vacuum arc extinguish chamber is effectively enlarged.
Moreover, because the conductive soft connection is arranged in the contact line, when the conductive rod drives the main contact blade to move backwards, the conductive soft connection can deform to meet the maximum distance between the connecting end of the conductive rod and the connecting end of the arc contact blade, and the size requirement of a fracture formed after the main contact blade is separated from the arc contact blade is met. Therefore, even if the deflection condition occurs during assembly, due to the fact that the set fracture distance is large, enough fracture distance can still be formed, and the main contact blade and the arc contact blade are guaranteed to be separated reliably.
The invention provides a specific embodiment 2 of a contact structure of a vacuum arc-extinguishing chamber:
the difference from example 1 is mainly that: in example 1, the elastic member is an elastic bellows. Based on the purpose of realizing the elastic fit between the arc contact blade and the arc contact blade, the elastic element can also adopt a pressure spring, the pressure spring can meet the requirement of high-temperature brazing temperature, the pressure spring is sleeved outside the shielding cylinder, one end of the pressure spring is propped against the central disc, and the other end of the pressure spring is propped against the arc contact blade.
The specific embodiment 3 of the contact structure of the vacuum arc-extinguishing chamber provided by the invention is as follows:
the difference from example 1 is mainly that: in embodiment 1, the conductive flexible connection in the contact coil is arranged between the front connection portion and the rear connection portion of the upper circumferential coil. In this embodiment, the inclined transition connection section may be omitted, and the upper circumferential coil and the lower circumferential coil are conductively connected by using a conductive flexible connection, that is, one end of the conductive flexible connection is welded to the corresponding end of the upper circumferential coil, and the other end of the conductive flexible connection is welded to the corresponding end of the lower circumferential coil.
Of course, in other embodiments, the electrically conductive flexible connection may also be arranged between the central disk and the upper circumferential coil section, that is, the radial connection arm is omitted, that is, one end of the electrically conductive flexible connection is welded to the central disk, and the other end is welded to the corresponding position of the upper circumferential coil section, in this case, the central disk serves as the electrically conductive rod connection portion, and the upper circumferential coil section and the lower circumferential coil section both serve as the arc contact blade connection portions.
Of course, in other embodiments, the conductive flexible connection may be disposed at other positions of the contact coil, as long as the conductive rod connection end and the arc contact blade connection end can realize a relatively large-amplitude relative displacement.
The specific embodiment 4 of the contact structure of the vacuum arc-extinguishing chamber provided by the invention is as follows:
the difference from example 1 is mainly that: in embodiment 1, the contact coil is a coil that generates a longitudinal magnetic field. In this embodiment, the contact coil is a coil generating a transverse magnetic field, the existing transverse coil structure generating the transverse magnetic field can be modified and cut off at a suitable position on the contact coil structure to form a conductive rod connecting part and an arc contact blade connecting part, and then the conductive rod connecting part and the arc contact blade connecting part are connected by welding to form a conductive flexible connection.
The invention provides a specific embodiment 5 of a contact structure of a vacuum arc-extinguishing chamber:
the difference from example 1 is mainly that: in embodiment 1, be equipped with the contact shield cover at the contact coil dustcoat, not only form the protection to the contact coil, avoid the electric arc that forms between two arc contact blades of sound contact to influence the contact coil, simultaneously, can support the arc contact blade when closing a floodgate and accomplish, improve the intensity of arc contact blade. In this embodiment, the contact shield is omitted, and the arc-shaped turned edge is arranged at the edge of the arc contact blade, and the arc-shaped turned edge has a set length extending towards the conductive rod, so that the lower part of the contact coil can be covered, and the function of shielding and protecting the contact coil can also be achieved.
the structure of the contact coil in this embodiment is the same as that of the contact coil in the vacuum interrupter contact structure embodiment 1, and is not described again here.
In other embodiments, the contact coil may also adopt the structure of the contact coil in the vacuum interrupter contact structure embodiment 3 or embodiment 4, which is not described herein again.
Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A contact coil for generating a magnetic quenching field, comprising:
the coil body is used for generating an arc extinguishing magnetic field and comprises a conductive rod connecting part, an arc contact blade connecting part and a conductive flexible connection;
the conducting rod connecting part is provided with a conducting rod connecting end which is used for fixedly and conductively connecting with a corresponding conducting rod;
the arc contact blade connecting part is provided with an arc contact blade connecting end which is used for being fixedly and electrically connected with the corresponding arc contact blade;
the connecting end of the conducting rod and the connecting end of the arc contact blade are arranged at intervals along the vertical direction corresponding to the axial direction of the conducting rod;
one end of the conductive flexible connection is fixedly and conductively connected with the conductive rod connecting part, the other end of the conductive flexible connection is fixedly and conductively connected with the arc contact blade connecting part, the conductive flexible connection has a set deformation amplitude, when the conductive rod drives the conductive rod connecting end to move towards the direction far away from the arc contact, the conductive rod connecting end and the arc contact blade connecting end have a set maximum distance, and the size requirement of a fracture formed after the main contact blade at the end part of the conductive rod is separated from the arc contact blade is met;
the coil main part includes the center disk, and the center disk has the centre bore, and the centre bore does conducting rod link and conducting rod welded connection, the center disk is connected with circumference coil section through radial linking arm an organic whole, goes up circumference coil section and extends along center disk circumference, goes up circumference coil section and includes preceding connecting portion electrically conductive flexible connection and back connecting portion, electrically conductive flexible connection's one end and the electrically conductive fixed connection of preceding connecting portion, the other end and the electrically conductive fixed connection of back connecting portion, go up circumference coil section and be connected with circumference coil section down through slope transitional coupling section, circumference coil section extends along center disk circumference down, arc contact piece link set up in on the circumference coil section down, center disk, radial linking arm and preceding connecting portion constitute conducting rod coupling part, back connecting portion, slope transitional coupling section and lower circumference coil section constitute arc contact piece coupling part.
2. A vacuum interrupter contact structure comprising:
a conductive rod extending in the vertical direction in the axial direction;
the main contact blade is fixedly arranged at the lower end of the conductive rod so as to form a main contact structure with the conductive rod;
the arc contact blade is positioned below the main contact blade and is connected with the conductive rod through a contact coil, and the arc contact blade, the contact coil and the conductive rod form an arc contact structure;
the contact coil is used for generating an arc extinguishing magnetic field, the contact coil is sleeved at the lower end of the conducting rod, one end of the contact coil is in conductive fixed connection with the conducting rod, and the other end of the contact coil is in conductive fixed connection with the arc contact;
characterized in that the contact coil comprises:
the coil body comprises a conductive rod connecting part, an arc contact blade connecting part and a conductive flexible connection;
the conducting rod connecting part is provided with a conducting rod connecting end which is fixedly connected with the conducting rod in a conducting way;
the arc contact blade connecting part is provided with an arc contact blade connecting end which is fixedly and conductively connected with the arc contact blade;
the connecting end of the conducting rod and the connecting end of the arc contact blade are arranged at intervals in the vertical direction;
one end of the conductive flexible connection is fixedly and conductively connected with the conductive rod connecting part, the other end of the conductive flexible connection is fixedly and conductively connected with the arc contact blade connecting part, the conductive flexible connection has a set deformation amplitude, when the conductive rod drives the conductive rod connecting end to move towards the direction far away from the arc contact blade, the conductive rod connecting end and the arc contact blade connecting end have a set maximum distance, and the size requirement of a fracture formed after the main contact blade is separated from the arc contact blade is met;
the coil main part includes the center disk, and the center disk has the centre bore, and the centre bore does conducting rod link and conducting rod welded connection, the center disk is connected with circumference coil section through radial linking arm an organic whole, goes up circumference coil section and extends along center disk circumference, goes up circumference coil section and includes preceding connecting portion electrically conductive flexible connection and back connecting portion, electrically conductive flexible connection's one end and the electrically conductive fixed connection of preceding connecting portion, the other end and the electrically conductive fixed connection of back connecting portion, go up circumference coil section and be connected with circumference coil section down through slope transitional coupling section, circumference coil section extends along center disk circumference down, arc contact piece link set up in on the circumference coil section down, center disk, radial linking arm and preceding connecting portion constitute conducting rod coupling part, back connecting portion, slope transitional coupling section and lower circumference coil section constitute arc contact piece coupling part.
3. Vacuum interrupter contact structure according to claim 2, characterized in that the lower circumferential coil section has a connection projection which is arranged protruding towards the arc contact blade, which connection projection is welded with the arc contact blade as the arc contact blade connection end.
4. Vacuum interrupter contact structure according to claim 2 or 3, characterized in that a spring element is arranged between the contact rod connection part and the arc contact blade, which spring element is located between the contact rod connection part and the arc contact blade to exert a spring force forcing the two away from each other.
5. The vacuum interrupter contact structure of claim 4, wherein the resilient member is a resilient bellows that is sleeved outside the conductive rod.
6. The contact structure of the vacuum interrupter according to claim 2 or 3, wherein the arc contact blade is provided with a shielding cylinder on an upper side facing the conductive rod, the shielding cylinder is used for inserting the main contact blade and the conductive rod, the radial dimension of the main contact blade is larger than that of the conductive rod to form a flange, the upper end of the shielding cylinder is provided with an inner blocking edge, and the inner blocking edge is matched with the flange blocking when the conductive rod drives the main contact blade to move towards a direction away from the arc contact blade to form a fracture with a set dimension between the main contact blade and the arc contact blade.
7. The contact structure of the vacuum interrupter according to claim 2 or 3, wherein the conductive rod is fixedly connected with a contact shield, the contact shield is covered outside the contact coil, the lower end of the contact shield is a supporting pressing end, and the supporting pressing end is in press-fit connection with the upper side supporting pressing of the outer edge of the arcing contact blade when the conductive rod drives the main contact blade to move towards the arcing contact blade to the main contact blade and the arcing contact blade for conducting contact.
8. The vacuum interrupter contact structure according to claim 7, wherein the outer edge of the arcing contact blade has an arc-shaped flange folded toward the conductive rod, and an upper side of the arc-shaped flange is adapted to be in abutting engagement with the abutting end support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011023693.8A CN112509856B (en) | 2020-09-25 | 2020-09-25 | Contact coil for generating arc extinguishing magnetic field and vacuum arc extinguishing chamber contact structure |
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| CN202011023693.8A CN112509856B (en) | 2020-09-25 | 2020-09-25 | Contact coil for generating arc extinguishing magnetic field and vacuum arc extinguishing chamber contact structure |
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