CN111508779B - Contact structure of medium-frequency contactor, contactor and method - Google Patents
Contact structure of medium-frequency contactor, contactor and method Download PDFInfo
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- CN111508779B CN111508779B CN202010369991.6A CN202010369991A CN111508779B CN 111508779 B CN111508779 B CN 111508779B CN 202010369991 A CN202010369991 A CN 202010369991A CN 111508779 B CN111508779 B CN 111508779B
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- contact
- contactor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
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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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
In the contact structure of the intermediate frequency contactor, a fixed contact base comprises a cavity, a moving contact base is positioned above a fixed contact piece, the moving contact piece is arranged on the lower surface of the moving contact base and is arranged at intervals relative to the fixed contact piece to form a gap, a copper connecting piece is connected with an insulating connecting piece through a bolt, the copper connecting piece for electrical connection generates an alternating magnetic field through intermediate frequency current, a connecting rod mechanism connecting piece is configured to be connected with a connecting rod, so that the moving contact piece moves to enable the moving contact piece to be in contact with the fixed contact piece, four magnetism increasing blocks are respectively arranged on the inner side of an insulating shell and are prevented from being in contact with the fixed contact portion and the moving contact portion, and the four magnetism increasing blocks play a magnetic conduction role to enhance the magnetic field between the gaps, so that an arc blows towards.
Description
Technical Field
The invention relates to the technical field of electromagnetic equipment, in particular to a contact structure of an intermediate frequency contactor, a contactor and a method.
Background
An electromagnetic contactor is an electromechanical component and is widely applied to power control, industrial automation devices, household appliances and the like. The automatic switch is an automatic switch which uses smaller current and lower voltage to control larger current and higher voltage, and plays the roles of automatic regulation, safety protection, conversion circuit and the like in the circuit.
When current is switched on and off, electric arc can be generated between contacts, the electric arc burns between the contacts of the switching device and can cause ablation to the contacts, if the electric arc cannot be extinguished in time, loop current cannot be switched on and off, even serious accidents can be caused, and for quickly extinguishing the electric arc, an arc extinguishing device with strong arc extinguishing capacity is generally adopted to finish the elongation and cooling of the electric arc.
The method of using the force of magnetic field to current to achieve arc extinction is called magnetic quenching. When a large electromotive force is required to elongate the arc, a special magnetic blow coil is typically used to generate a sufficiently strong magnetic field. Electromagnetic forces can be used to influence the arc and to direct it into a specially divergent shaped arc ignition angle, thereby lengthening the arc. The movement and elongation of the arc facilitates cooling and deionization of the arc column, thereby achieving the arc extinguishing effect.
The 400Hz medium-frequency power supply has wide application in the fields of aviation, ships and the like, and compared with the power frequency, the contactor applied to the working condition has larger current change rate di/dt along with time in the on-off process, and the overvoltage in the corresponding on-off process is higher, so that the contactor is not favorable for being successfully switched on and off. In addition, in the medium-frequency power supply environment, the current frequency is high, and the commutation is fast, so that the external magnetic field in a constant direction cannot achieve a good arc blowing effect.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a contact structure, a contactor, and a method for an if contactor, so as to overcome the defect that the constant magnetic field in the prior art cannot achieve a good arc blowing effect of the if contactor.
The purpose of the invention is realized by the following technical scheme.
A contact structure of a medium-frequency contactor comprises a contact body,
a contact structure of an intermediate frequency contactor comprises a fixed contact part, a movable contact part and a magnetism increasing module, wherein,
the static contact part comprises a static contact part,
a static contact base which comprises a cavity and is of a U-shaped structure,
a static contact piece fixed on the static contact base,
the first external circuit connecting sheet and the second external circuit connecting sheet are respectively arranged at two sides of the static contact base to be connected with an external circuit;
the movable contact part comprises a moving contact part and a moving contact part,
a moving contact base located above the static contact,
a movable contact piece arranged on the lower surface of the movable contact base and arranged at an interval relative to the static contact piece to form a gap,
an insulating connecting piece riveted with the moving contact base,
a copper connector bolted to the insulating connector, the copper connector for electrical connection generating an alternating magnetic field via a medium frequency current,
a linkage mechanism connection configured to connect a linkage to actuate the movable contact portion to move such that the movable contact contacts the stationary contact,
the magnetism increasing module comprises a magnetic flux increasing module,
a contactor insulating housing covering the contact structure, the contactor insulating housing having four inner slots disposed inside, the inner slots being adjacent to the gap,
and the four magnetism increasing blocks are respectively arranged in the groove in the insulating shell and are prevented from contacting the static contact part and the movable contact part, wherein the four magnetism increasing blocks playing a role of magnetic conduction enhance the magnetic field between the gaps, so that the electric arc is blown out towards the arc extinguishing space under the action of the magnetic field.
In the contact structure of the intermediate frequency contactor, after an electromagnetic mechanism of the intermediate frequency contactor is powered off, the movable contact part is reset under the traction of the connecting rod so as to separate the movable contact piece and the static contact piece.
In the contact structure of the intermediate frequency contactor, the contact structure of the intermediate frequency contactor comprises two moving contact bases with double breakpoints, and a copper connecting piece is arranged between the two moving contact bases.
In the contact structure of the intermediate frequency contactor, the first and second external circuit connecting sheets are respectively connected with an external circuit through an external circuit bolt.
In the contact structure of the medium-frequency contactor, the insulating connecting piece and the moving contact base are riveted and then are connected with the copper connecting piece through three parts of bolts.
In the contact structure of the medium-frequency contactor, the magnetism increasing block is made of ferromagnetic materials.
In the contact structure of the medium-frequency contactor, the copper connecting piece surrounds anticlockwise from the current inflow end of the copper connecting piece to the current outflow end.
A contactor comprises the contact structure of the medium-frequency contactor.
The contact method of the contact structure of the intermediate frequency contactor comprises the following steps,
when the electromagnetic mechanism is electrified, the movable contact part moves under the traction of the connecting rod to make the movable contact with the static contact,
after the electromagnetic mechanism is powered down, the movable contact part is reset under the traction of the connecting rod to cause the movable contact and the static contact to be separated, the copper connecting piece generates an alternating magnetic field when passing through intermediate-frequency current, the four magnetism increasing blocks are placed in front of and behind the contact gaps to increase the magnetic field between the gaps, and alternating-current electric arc blows arc towards the arc extinguishing space under the action of the magnetic field between the gaps.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, on the basis of not increasing the overall dimension of a product, not increasing the power consumption of a coil control part and not adding a magnetic field for arc blowing, the self-generated magnetic field for arc blowing of a conductive loop is realized through the structure of the movable contact, and meanwhile, the magnetic field between contact gaps is enhanced by adding the magnetism increasing block, so that the movement of an arc root and the offset of an arc column are facilitated, and the arc striking and arc blowing effects are enhanced. Moreover, the amount of copper used is effectively reduced by modifying the connecting structure of the moving contact base and the structure of the static contact, and the U-shaped structure of the static contact base is beneficial to running of electric arcs. The contactor has compact structure, long electric service life and mechanical service life, low price and batch production.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
fig. 1 is a schematic diagram of a contact structure of a medium frequency contactor according to one embodiment of the invention;
FIG. 2 is a close-up schematic of a mid-frequency contactor contact configuration according to one embodiment of the invention;
fig. 3 is a schematic view of the directions of current and magnetic field when the contact structure of the if contactor according to the present invention is opened.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1 to 3, a contact structure of a medium frequency contactor includes a stationary contact part, a movable contact part, and a magnetizing module, wherein,
the static contact part comprises a static contact part,
a static contact base 2 which comprises a cavity 10 and is of a U-shaped structure,
a static contact piece 9 fixed on the static contact base 2,
the first and second external circuit connecting sheets 1 and 11 are respectively arranged at two sides of the static contact base 2 to be connected with an external circuit;
the movable contact part comprises a moving contact part and a moving contact part,
a moving contact base 3 positioned above the static contact 9,
a movable contact piece 7 which is arranged on the lower surface of the movable contact base 3 and is arranged at a distance relative to the static contact piece 9 to form a gap,
an insulating connecting piece 6 riveted with the moving contact base 3,
a copper connector 4 bolted to the insulating connector 6, the copper connector 4 for electrical connection generating an alternating magnetic field via a medium frequency current,
a link mechanism connecting member 5 configured to connect links such that the movable contact portion moves such that the movable contact piece 7 contacts the stationary contact piece 9,
the magnetism increasing module comprises a magnetic flux increasing module,
a contactor insulating housing covering the contact structure, the contactor insulating housing having four inner slots disposed inside, the inner slots being adjacent to the gap,
and the four magnetism increasing blocks 8 are respectively arranged in the groove in the insulating shell and are prevented from contacting the static contact part and the movable contact part, wherein the four magnetism increasing blocks playing a role of magnetic conduction enhance the magnetic field between the gaps, so that the electric arc is blown out towards the arc extinguishing space under the action of the magnetic field.
When the contact structure breaks current, electric arcs are generated between the moving contact piece and the static contact piece, and an alternating electromagnetic field generated by a copper connecting piece between two parts of moving contact bases under the action of medium-frequency current is utilized to achieve the effect of arc blowing. Further, by reasonably designing the surrounding direction of the copper connecting piece, when the current direction changes, the electric arc can also move towards the arc extinguishing space 12 constantly under the action of the alternating magnetic field and is extinguished in an accelerating way, so that the arc extinguishing performance of the contactor under the medium-frequency current is improved. In the preferred embodiment of the contact structure of the intermediate frequency contactor, after the electromagnetic mechanism of the intermediate frequency contactor is powered off, the movable contact part is reset under the traction of the connecting rod so as to separate the movable contact piece 7 from the static contact piece 9.
In the preferred embodiment of the contact structure of the medium frequency contactor, the moving contact structure of the medium frequency contactor comprises two moving contact bases 3 with double breakpoints, and a copper connecting piece 4 is arranged between the two moving contact bases 3.
In the preferred embodiment of the contact structure of the intermediate frequency contactor, the first and second external circuit connecting pieces 1 and 11 are respectively connected with an external circuit through an external circuit bolt.
In the preferred embodiment of the contact structure of the medium frequency contactor, the insulating connecting piece 6 and the moving contact base 3 are riveted and then connected with the copper connecting piece 4 through three parts of bolts.
In the preferred embodiment of the contact structure of the medium frequency contactor, the magnetism increasing block 8 is made of ferromagnetic material.
In the preferred embodiment of the contact structure of the medium frequency contactor, the copper connecting piece 4 surrounds counterclockwise from the current inflow end of the copper connecting piece 4 to the current outflow end.
In the preferred embodiment of the contact structure of the medium frequency contactor, the fixed contact base 2 is in a U-shaped structure.
In the preferred embodiment of the contact structure of the medium frequency contactor, except for the copper connecting piece 4, the contact structure of the medium frequency contactor is an axisymmetric structure.
In the preferred embodiment of the contact structure of the medium frequency contactor, the copper connecting piece 4 is located on the central axis of the axisymmetric structure.
In the preferred embodiment of the contact structure of the intermediate frequency contactor, the magnetizing blocks 8 and the moving and static contact pieces 9 are symmetrically distributed.
To further understand the present invention, in one embodiment, a medium frequency contactor contact structure includes a movable contact portion, a stationary contact portion, and a magnetizing block.
The static contact part comprises a static contact 9, a static contact base 2 and external circuit connecting sheets 1 and 11;
the moving contact part comprises a moving contact piece 7, a moving contact base 3, a copper connecting piece 4, an insulating connecting piece 6 and a connecting rod mechanism connecting piece 5;
the magnetism increasing module comprises four magnetism increasing blocks in the front-back direction of a gap between the moving contact and the static contact, and the magnetism increasing blocks 8 are fixed on the inner side of an outer insulating shell of the contact structure and are not in contact with any part of the contact structure.
The current inflow sheet 1 and the current outflow sheet 11 are fixed on the static contact base 2 and are connected with an external circuit bolt;
two moving contact bases in the double-breakpoint contact structure of the contactor are electrically connected through a moving contact copper connecting piece 4; the moving contact insulating connecting piece 6 and the moving contact base 3 are riveted firstly and then are connected with the moving contact copper connecting piece 4 through three parts of bolts.
Four magnetism increasing blocks are arranged in the front and back directions of the gap between the moving contact and the static contact and used for increasing the magnetic field of the gap between the contacts, and the materials of the magnetism increasing blocks are all ferromagnetic materials.
The static contact base 2 is designed into a U-shaped structure, and a cavity 10 is contained in the U-shaped structure, and the structure is beneficial to running and elongation of an electric arc.
The movable contact part is connected with the connecting rod through the connecting rod mechanism connecting piece 5, and when the electromagnetic mechanism is electrified, the movable contact part moves under the traction of the connecting rod to guide the movable contact and the static contact to be contacted, so that the movable contact and the static contact are closed.
After the electromagnetic mechanism is powered off, the movable contact part is reset under the traction of the connecting rod, and the movable contact part is actuated and separated from the static contact, so that the current breaking is realized.
In particular, the copper connecting member 4 between the two moving contact bases of the double-breakpoint has a requirement of a surrounding direction, that is, the copper connecting member surrounds counterclockwise in a front view direction when viewed from a current inflow end to a current outflow end of the copper connecting member.
When the contactor breaks current, the moving contact copper connecting piece 4 of the double-breakpoint intermediate frequency contactor generates an alternating magnetic field when passing through intermediate frequency current, the copper connecting piece can be equivalent to a coil wound in a counterclockwise direction when viewed from the current flowing direction of the copper connecting piece, the connecting piece can generate an alternating electromagnetic field under the action of intermediate frequency current, and the direction of the magnetic field changes along with the direction of the current. Under the design, no matter the current is positive and negative, the alternating current arc always moves and elongates to the arc extinguishing space 12 under the action of the alternating magnetic field, the structure can realize the self-generated magnetic field arc blowing of the conductive loop, and meanwhile, the magnetic field between the movable contact piece 7 and the static contact piece 9 is effectively increased by adding the magnetism increasing block, so that the arc striking and arc blowing effects are enhanced.
The contactor comprises the contact structure of the medium-frequency contactor.
The contact method of the contact structure of the intermediate frequency contactor comprises the following steps,
when the electromagnetic mechanism is electrified, the moving contact part moves under the traction of the connecting rod to lead the moving contact piece 7 to contact the static contact piece 9,
after the electromagnetic mechanism is powered off, the movable contact part resets under the traction of the connecting rod to cause the movable contact 7 to be separated from the static contact 9, the copper connecting piece 4 generates an alternating magnetic field when passing through medium-frequency current, and alternating current electric arc blows arc towards the arc extinguishing space direction under the action of the alternating magnetic field and the magnetic field generated by the four magnetism increasing blocks 8 between the gaps.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (9)
1. A contact structure of an intermediate frequency contactor comprises a fixed contact part, a movable contact part and a magnetism increasing module, wherein,
the static contact part comprises a static contact part,
a static contact base which comprises a cavity and is of a U-shaped structure,
a static contact piece fixed on the static contact base,
the first external circuit connecting sheet and the second external circuit connecting sheet are respectively arranged at two sides of the static contact base to be connected with an external circuit;
the movable contact part comprises a moving contact part and a moving contact part,
a moving contact base located above the static contact,
a movable contact piece arranged on the lower surface of the movable contact base and arranged at an interval relative to the static contact piece to form a gap,
an insulating connecting piece riveted with the moving contact base,
a copper connector bolted to the insulating connector, the copper connector for electrical connection generating an alternating magnetic field via a medium frequency current,
a linkage mechanism connection member configured to connect the links such that the movable contact portion moves such that the movable contact contacts the stationary contact,
the magnetism increasing module comprises a magnetic flux increasing module,
a contactor insulating housing covering the contact structure, the contactor insulating housing having four inner slots disposed inside, the inner slots being adjacent to the gap,
and the four magnetism increasing blocks are respectively arranged in the groove in the insulating shell and are prevented from contacting the static contact part and the movable contact part, wherein the four magnetism increasing blocks playing a role of magnetic conduction enhance the magnetic field between the gaps, so that the electric arc is blown out towards the direction of the arc extinguishing space under the action of the magnetic field.
2. A medium frequency contactor contact structure as claimed in claim 1, wherein the movable contact part is reset under the traction of the connecting rod to separate the movable contact piece and the static contact piece after the electromagnetic mechanism of the medium frequency contactor is powered down.
3. A contact structure of a medium frequency contactor as claimed in claim 1, wherein the moving contact structure of the medium frequency contactor comprises two moving contact bases with double breaking points, and a copper connecting piece is arranged between the two moving contact bases.
4. A mid-frequency contactor contact structure as claimed in claim 1, wherein the first and second external circuit connection pads are connected to the external circuit via external circuit bolts, respectively.
5. A contact structure of a medium frequency contactor as claimed in claim 1, wherein the insulating connecting member and the moving contact base are riveted and then connected with a copper connecting member by three bolts.
6. A contact structure of an intermediate frequency contactor as claimed in claim 1, wherein the magnetizing block is a ferromagnetic material.
7. A mid-frequency contactor contact structure as claimed in claim 1, wherein the copper connector is wound counterclockwise from a current inflow end toward a current outflow end of the copper connector.
8. A contactor comprising a medium frequency contactor contact structure according to any one of claims 1-7.
9. A contact method using the contact structure of the medium frequency contactor as claimed in any one of claims 1 to 7, comprising the steps of,
when the electromagnetic mechanism is electrified, the movable contact part moves under the traction of the connecting rod to make the movable contact with the static contact,
after the electromagnetic mechanism is powered down, the movable contact part is reset under the traction of the connecting rod to cause the movable contact and the static contact to be separated, the copper connecting piece generates an alternating magnetic field when passing through intermediate-frequency current, the four magnetism increasing blocks are placed in front of and behind the contact gaps to increase the magnetic field between the gaps, and alternating-current electric arc blows arc towards the arc extinguishing space under the action of the magnetic field between the gaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010369991.6A CN111508779B (en) | 2020-04-30 | 2020-04-30 | Contact structure of medium-frequency contactor, contactor and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010369991.6A CN111508779B (en) | 2020-04-30 | 2020-04-30 | Contact structure of medium-frequency contactor, contactor and method |
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| CN111508779A CN111508779A (en) | 2020-08-07 |
| CN111508779B true CN111508779B (en) | 2021-05-28 |
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| CN109300742A (en) * | 2018-09-10 | 2019-02-01 | 上海良信电器股份有限公司 | A kind of arc quenching system of D.C. contactor |
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| JPH0845395A (en) * | 1994-07-29 | 1996-02-16 | Matsushita Electric Works Ltd | Arc-extinguishing device |
| CN1509485A (en) * | 2001-05-03 | 2004-06-30 | ���ĺ� | Vacuum circuit breaker with coaxial coil for generating axial magnetic field in vicinity of the contact members of the circuit breaker |
| CN200941346Y (en) * | 2006-03-03 | 2007-08-29 | 西安开天铁路牵引电器有限公司 | Electromagnetic arc blower of a.c. electromagnetic contactor |
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| CN111508779A (en) | 2020-08-07 |
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