CN109659199B - DC relay capable of extinguishing arc and resisting short-circuit current - Google Patents
DC relay capable of extinguishing arc and resisting short-circuit current Download PDFInfo
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- CN109659199B CN109659199B CN201811624113.3A CN201811624113A CN109659199B CN 109659199 B CN109659199 B CN 109659199B CN 201811624113 A CN201811624113 A CN 201811624113A CN 109659199 B CN109659199 B CN 109659199B
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- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 148
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 230000003068 static effect Effects 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract 12
- 230000000171 quenching effect Effects 0.000 claims abstract 12
- 239000004020 conductor Substances 0.000 claims description 75
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 74
- 229910052742 iron Inorganic materials 0.000 claims description 36
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
- H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
- H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Contacts (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a direct current relay capable of extinguishing arc and resisting short-circuit current, which comprises two static contact leading-out ends, a movable reed of a straight piece type, a push rod part and two magnetic steels; the two pieces of magnetic steel are respectively arranged at positions corresponding to the moving contact points outside the two ends of the length of the moving reed to realize magnetic quenching, an upper magnetizer is arranged above the moving reed, and a lower magnetizer is arranged below the moving reed; at least one through hole is arranged in the movable reed, so that the upper magnetizer and the lower magnetizer can be mutually close to or mutually contact through the through hole, and at least two independent magnetic conduction loops are formed on the width of the movable reed by the upper magnetizer and the lower magnetizer. The invention can utilize the pole faces of each magnetic conduction loop which are increased at the corresponding through hole positions, when the movable reed breaks down and has high current, the attraction force in the contact pressure direction is generated, and the electric repulsive force generated between the movable reed and the fixed contact leading-out end due to the fault current is resisted.
Description
Technical Field
The invention relates to the technical field of relays, in particular to a direct current relay capable of extinguishing arc and resisting short-circuit current.
Background
A direct current relay in the prior art adopts a direct-acting magnetic circuit structure, two static contact leading-out ends (namely, two load leading-out ends) are respectively arranged on a shell, the bottom ends of the two static contact leading-out ends are provided with static contacts, the current of one static contact leading-out end flows in, the current of the other static contact leading-out end flows out, a movable spring and a push rod component are arranged in the shell, the movable spring adopts a direct-acting movable spring (also called a bridge movable spring), the movable spring is arranged in the push rod component through a spring, the push rod component is connected with the direct-acting magnetic circuit, and under the action of the direct-acting magnetic circuit, the push rod component drives the movable spring to move upwards, so that the movable contacts at the two ends of the movable spring are respectively contacted with the static contacts at the bottom ends of the two static contact leading-out ends, and the communication load is realized. In the prior art, magnetic steel is generally arranged near the contacts, and arc extinction is realized by utilizing a magnetic field generated by the magnetic steel. Along with the rapid development of new energy industry, the requirements on the short circuit resistance function of the direct current relay are higher and higher, but the direct current relay in the prior art cannot provide enough suction force under the characteristic of keeping small volume, namely, the contact pressure is insufficient to resist the electric repulsive force suffered by the movable spring, so that the market requirements are difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a direct current relay which can extinguish arc and resist short-circuit current, can provide enough contact pressure on the basis of realizing arc extinction and keeping the small size of a product so as to resist electric repulsive force caused by large short-circuit current received by a movable spring, and has the characteristics of high magnetic efficiency and difficult saturation of a magnetic circuit.
The technical scheme adopted for solving the technical problems is as follows: a DC relay capable of extinguishing arc and resisting short-circuit current comprises two stationary contact leading-out ends, a movable reed with a straight piece, a push rod component and two magnetic steels; the movable reed is arranged on the push rod part so as to realize that the movable contacts at the two ends of the movable reed are matched with the fixed contacts at the bottom ends of the two fixed contact leading-out ends under the action of the push rod part; the two pieces of magnetic steel are respectively arranged at positions corresponding to the dynamic contact points outside the two ends of the length of the movable reed, and the magnetic poles of the opposite surfaces of the two pieces of magnetic steel are opposite; the two pieces of magnetic steel are also connected with two yoke clamps, and the two yoke clamps at least comprise yoke sections which are positioned at two sides of the width of the movable reed and correspond to the positions of the movable contact points; an upper magnetizer distributed along the width of the movable reed is arranged above the position between the two movable contacts of the movable reed, and a lower magnetizer which is distributed along the width of the movable reed and can move along with the movable reed is arranged below the position; at least one through hole is arranged in the movable reed at the position, so that the upper magnetizer and the lower magnetizer can be mutually close to or mutually contacted through the through hole, and at least two independent magnetic conduction loops are formed on the width of the movable reed by the upper magnetizer and the lower magnetizer, so that when the movable reed breaks down with high current by utilizing pole faces of the magnetic conduction loops which are increased at the corresponding through hole positions, suction force in the contact pressure direction is generated, and electric repulsive force generated between the movable reed and the fixed contact leading-out end due to fault current is resisted.
The two pieces of magnetic steel are respectively arranged at the positions opposite to the dynamic and static contacts.
The U-shaped bottom walls of the two yoke iron clamps are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other, and the end parts of the two side walls of the U-shaped two yoke iron clamps respectively form corresponding yoke iron sections.
The U-shaped bottom walls of the two yoke iron clamps are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other, and the ends of the two side walls of the U-shaped two yoke iron clamps respectively exceed the positions of the two sides of the width of the movable reed, which correspond to the movable contact points; the two U-shaped side walls of the two yoke clamps contain the yoke sections.
The U-shaped bottom walls of the two yoke iron clips are respectively matched with two sides of the width of the movable reed, and the ends of the two side walls of the U-shaped two yoke iron clips are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other.
The upper magnetizer is at least one in-line upper magnetizer, and the lower magnetizer is at least two U-shaped lower magnetizers; wherein, a U-shaped lower magnetizer and a corresponding in-line upper magnetizer form an independent magnetic conduction loop, and the two U-shaped lower magnetizers of two adjacent magnetic conduction loops are not contacted.
In at least two independent magnetic conduction loops, at least one group of two adjacent linear upper magnetic conductors of the two magnetic conduction loops are shared, and two U-shaped lower magnetic conductors of the two adjacent magnetic conduction loops are respectively matched below one linear upper magnetic conductor.
In at least two independent magnetic conduction loops, the upper magnetic conductors of the straight line shapes of all the two adjacent magnetic conduction loops are two independent magnetic conduction loops, and the lower magnetic conductors of the two U shapes of the two adjacent magnetic conduction loops are respectively matched below the corresponding upper magnetic conductors of the straight line shapes.
The two magnetic conduction loops are two, the movable reed is provided with a through hole, one side wall of each U-shaped lower magnetizer is respectively attached to the corresponding side edge of the width of the movable reed, the other side wall of each U-shaped lower magnetizer respectively penetrates through the same through hole of the movable reed, and a gap is reserved between the other side walls of the two U-shaped lower magnetizers.
The other side walls of the two U-shaped lower magnetizers are distributed side by side or staggered in the same through hole of the movable reed along the length direction of the movable reed, so that the two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side or staggered along the length direction of the movable reed.
The two magnetic conduction loops are two, the movable reed is provided with two through holes, the two through holes are distributed side by side or are distributed in a staggered manner in the length direction of the movable reed, one side wall of each U-shaped lower magnetizer is respectively attached to the corresponding side edge of the width of the movable reed, and the other side wall of each U-shaped lower magnetizer is respectively matched in the two through holes of the movable reed, so that the two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side or are distributed in a staggered manner along the length direction of the movable reed.
The magnetic conduction loop is three, the movable reed is provided with two through holes, the three U-shaped lower magnetic conductors are sequentially arranged along the width of the movable reed, wherein two side walls of one U-shaped lower magnetic conductor in the middle respectively penetrate through the two through holes of the movable reed, one side wall of each of the two U-shaped lower magnetic conductors on two sides is respectively attached to the corresponding side edge of the width of the movable reed, the other side wall of each of the two U-shaped lower magnetic conductors on two sides respectively penetrates through the two through holes of the movable reed, and a gap is reserved between the two side walls in the same through hole in the movable reed.
The upper magnetic conductor is an upper armature, the upper armature is fixed on the push rod component, the lower magnetic conductor is a lower armature, the lower armature is fixed on the movable spring, the movable spring is installed in the push rod component through a spring, and when a movable contact of the movable spring is contacted with a fixed contact of the fixed contact leading-out end, a preset gap exists between the upper armature and the lower armature.
The upper magnetic conductor is an upper yoke iron, the upper yoke iron is fixed on a shell for mounting two stationary contact leading-out ends, the lower magnetic conductor is a lower armature iron, the lower armature iron is fixed on the movable spring, the movable spring is mounted in the push rod component through a spring, and when the movable contact of the movable spring is contacted with the stationary contact of the stationary contact leading-out ends, the upper yoke iron is contacted with the lower armature iron.
The push rod component comprises a U-shaped support, a spring seat and a push rod, wherein the top of the push rod is fixed with the spring seat, the bottom of the U-shaped support is fixed with the spring seat, a movable spring assembly formed by a movable spring and two U-shaped lower magnetizers is installed in the U-shaped support through a spring, the upper surface of the movable spring is propped against the inner wall of the top of the U-shaped support, and the spring is elastically propped against between the bottom ends of the two U-shaped lower magnetizers and the top end of the spring seat.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the structure that two magnetic steels are respectively arranged at the positions corresponding to the moving contact points outside the two ends of the length of the moving reed, and the magnetic poles of the opposite surfaces of the two magnetic steels are opposite; the two pieces of magnetic steel are also connected with two yoke clamps, and the two yoke clamps at least comprise yoke sections which are positioned at two sides of the width of the movable reed and correspond to the positions of the movable contact points; an upper magnetizer is arranged above the position between the two movable contacts of the movable reed, and a lower magnetizer which can move along with the movable reed is arranged below the position between the two movable contacts of the movable reed; at least one through hole is arranged in the movable reed at the position, so that the upper magnetizer and the lower magnetizer can be mutually close to or mutually contacted through the through hole, and at least two independent magnetic conduction loops are formed on the width of the movable reed by the upper magnetizer and the lower magnetizer. According to the structure, on the basis of realizing arc extinction by using two pieces of magnetic steel, the attraction force in the contact pressure direction is increased when a movable reed breaks down with large current by using the pole faces of the magnetic conduction loops at the positions of the corresponding through holes, and the attraction force and the contact pressure are superposed together to resist electric repulsive force between the movable contact and the fixed contact, wherein the electric repulsive force is generated by fault current; the plurality of independent magnetic conduction loops basically divide the short-circuit heavy current equally, have the magnetic efficiency height, the difficult saturated characteristics of magnetic circuit.
2. The invention adopts the independent magnetic conduction loops which are formed by matching the upper magnetic conductor in a straight shape and the lower magnetic conductor in a U shape, thus the same parts can be used, and the cost is low; gaps exist among the U-shaped lower magnetizers; the upper U-shaped magnetizer can be fixed on the push rod part or on a shell for installing the leading-out ends of two static contacts, the lower U-shaped magnetizers are respectively fixed in the movable reed in a riveting mode, and the top ends of the side walls of the lower U-shaped magnetizers are exposed out of the upper surface of the movable reed. The invention uses the upper magnetic conductor and the lower magnetic conductor to form a plurality of independent magnetic conduction loops at the section of the movable reed, when the movable reed passes through fault current, magnetic flux is generated on the plurality of magnetic conduction loops, suction force is generated between the magnetic conductors of each magnetic conduction loop, the suction force is in the direction of increasing contact pressure and is used for resisting electric repulsive force between contacts, and because the plurality of magnetic conduction loops are used, the fault current of each loop through accommodation is only Imax/n, so that the magnetic circuit is not easy to saturate, the larger the passing current is, the larger the contact pressure is increased, and the suction force generated by the magnetic conduction loop is also larger.
The invention is described in further detail below with reference to the drawings and examples; the dc relay of the present invention that can extinguish arc and resist short-circuit current is not limited to the embodiment.
Drawings
FIG. 1 is a schematic view of a partial construction of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a magnetic steel distribution according to a first embodiment of the present invention;
fig. 3 is a schematic view of a magnetic steel arc extinguishing structure (yoke clips not shown) according to a first embodiment of the present invention;
fig. 4 is a sectional view of a part of the structure (corresponding to a section along the length of the movable reed) of the first embodiment of the present invention;
fig. 5 is a sectional view of a part of the structure (corresponding to a section along the width of the movable reed) of the first embodiment of the present invention;
FIG. 6 is a schematic view showing the cooperation of the movable contact spring, the upper and lower magnetic conductors and the push rod member according to the first embodiment of the present invention;
fig. 7 is an exploded view showing the cooperation of the movable contact spring, the upper and lower magnetic conductors and the push rod member in accordance with the first embodiment of the present invention;
Fig. 8 is a schematic diagram of the cooperation of the movable reed and the upper and lower magnetic conductors according to the first embodiment of the present invention;
Fig. 9 is a schematic diagram of a movable reed and upper and lower magnetic conductors (turned over on one side) according to the first embodiment of the present invention;
FIG. 10 is a schematic view of the U-shaped bracket and upper magnetic conductor of the push rod assembly of the first embodiment of the present invention mated;
FIG. 11 is a schematic diagram showing the cooperation of the movable reed and the lower magnetic conductor according to the first embodiment of the present invention;
fig. 12 is a schematic diagram of a dual magnetic circuit according to a first embodiment of the present invention;
Fig. 13 is a schematic view of the stationary contact lead-out end and movable contact spring being mated (contact-opened) in accordance with the first embodiment of the present invention;
fig. 14 is a schematic view of the stationary contact lead-out end and movable contact spring being mated (contact point contacted) in accordance with the first embodiment of the present invention;
Fig. 15 is a schematic view of the stationary contact lead-out end and movable contact spring of the second embodiment of the present invention mated (contact open);
fig. 16 is a schematic view of the stationary contact lead-out end and movable contact spring of the second embodiment of the present invention mated (contact);
Fig. 17 is a schematic perspective view showing the cooperation of upper and lower magnetizers and a movable reed according to the third embodiment of the present invention;
Figure 18 is a cross-sectional view of the upper and lower magnetic conductors and movable reed of the third embodiment of the present invention mated;
fig. 19 is a schematic view showing the construction of a movable contact spring according to a third embodiment of the present invention.
Detailed Description
Example 1
Referring to fig. 1 to 14, a dc relay capable of extinguishing arc and resisting short-circuit current according to the present invention includes two stationary contact leading-out terminals 11, 12 for respectively flowing in and out current, a movable reed 2 of a straight sheet type, a push rod member 3 for driving the movable reed 2 to move so as to make or break the movable contacts at both ends of the movable reed and the stationary contacts at the bottom ends of the stationary contact leading-out terminals, and two magnetic steels 71; the two stationary contact leading-out ends 11 and 12 are respectively arranged on the shell 4, a movable reed 2 and a part of the push rod component 3 are accommodated in the shell 4, the push rod component 3 is also connected with the movable iron core 5 in the magnetic circuit structure, and under the action of the magnetic circuit, the push rod component 3 drives the movable reed 2 to move upwards, so that the movable contacts at the two ends of the movable reed 2 are respectively contacted with the stationary contacts at the bottom ends of the two stationary contact leading-out ends 11 and 12, and the communication load is realized; the movable reed 2 is mounted in the push rod part 3 by a spring 31 to enable the movable reed 2 to displace relative to the push rod part 3 (to enable over travel of contacts); the two magnetic steels 71 are positioned outside the shell 4, the two magnetic steels 71 are respectively arranged at positions corresponding to the moving contact points outside the two ends of the length of the movable reed 2, and the magnetic poles of the opposite sides of the two magnetic steels 71 are opposite; the two magnetic steels 71 are also connected with two yoke iron clips 72, and the two yoke iron clips 72 at least comprise yoke iron segments 721 positioned at two sides of the width of the movable reed 2 and corresponding to the positions of the movable contacts; in this embodiment, the stationary contact leading-out end 11 is a current inflow, and the stationary contact leading-out end 12 is a current outflow, so that in the movable reed 2, the current flows from the end close to the stationary contact leading-out end 11 to the other end close to the stationary contact leading-out end 12, and the two magnetic steels 71 are respectively configured at positions opposite to the movable contact; as shown in fig. 2, of the two pieces of magnetic steel 71, the magnetic pole of the one piece of magnetic steel 71 corresponding to the side of the stationary contact lead-out end 11 facing the corresponding stationary contact is set as the N pole, and the magnetic pole of the one piece of magnetic steel 71 corresponding to the side of the stationary contact lead-out end 12 facing the corresponding stationary contact is set as the S pole; an upper magnetizer 61 is arranged above the position (approximately the middle position of the movable contact spring) between the two movable contact points of the movable contact spring 2, in the embodiment, the upper magnetizer 61 is an upper armature, a lower magnetizer 62 capable of moving along with the movable contact spring is arranged below the position between the two movable contact points of the movable contact spring 2, and in the embodiment, the lower magnetizer 62 is a lower armature; in this embodiment, the upper magnetizer 61 is fixed to the push rod member 3, and the lower magnetizer 62 is fixed to the movable reed 2; at least one through hole 22 is provided in the movable contact at a position between the two movable contacts, so that the upper and lower magnetic conductors 61 and 62 can approach each other or contact each other through the through hole 22, and at least two independent magnetic conductive loops are formed by the upper and lower magnetic conductors 61 and 62 over the width of the movable contact 2, so that when a large fault current occurs in the movable contact 2 by using pole faces increased in the positions of the corresponding through holes of the respective magnetic conductive loops, a suction force in the contact pressure direction is generated (because the upper magnetic conductor 61 is relatively fixed and the lower magnetic conductor 62 is relatively movable, an upward suction force is formed) to resist an electric repulsive force generated between the movable contact and the stationary contact leading-out terminal due to a fault current. Wherein, the upper magnetizer and the lower magnetizer can be made of iron, cobalt, nickel, alloy thereof and other materials.
In this embodiment, the two yoke clips 72 are both U-shaped, the bottom walls 722 of the U-shapes of the two yoke clips 72 are respectively connected with the opposite sides of the two magnetic steels 71, i.e. one yoke clip 72 is connected with one magnetic steel 71, and the ends of the two side walls 723 of the U-shapes of the two yoke clips respectively exceed the positions corresponding to the moving contact points on the two sides of the width of the movable reed 2; the yoke segments 721 are contained in both U-shaped side walls 723 of the two yoke clips 72.
Of course, the length of the two U-shaped side walls 723 of the yoke clip 72 may be made shorter, for example, the ends of the two U-shaped side walls of the yoke clip may be yoke segments.
Of course, each yoke iron clip 72 may be connected to two pieces of magnetic steel, that is, the bottom walls of the U-shapes of the two yoke iron clips are respectively adapted to two sides of the width of the movable reed, and the ends of the two side walls of the U-shapes of the two yoke iron clips are respectively connected to opposite sides of the two pieces of magnetic steel.
In this embodiment, the magnetic fields formed by the two magnetic steels 71 and the two yoke clips 72 can form magnetic blowing forces in directions indicated by arrows in fig. 2, and the two magnetic blowing forces respectively arc-extinguishing the two pairs of moving contacts, so that the directions of the magnetic blowing forces are all oblique outside, and no interference is generated between the two pairs of moving contacts. The magnetic field formed by the cooperation of the two magnetic steels 71 and the two yoke clips 72 also acts on the movable reed 2, but does not act because the two forces cancel each other.
The direct current relay has no polarity requirement on load and equivalent forward and reverse arc extinguishing capability.
In the present invention, the two independent magnetic conductive loops means that the two magnetic conductive loops do not interfere with each other, that is, the magnetic fluxes do not cancel each other.
In this embodiment, as shown in fig. 13 and 14, since the upper magnetizer 61 is fixed to the push rod member 3 and the lower magnetizer 62 is fixed to the movable reed 2, the movable reed 2 is mounted in the push rod member 3 by the spring 31, when the movable contact of the movable reed 2 contacts the stationary contacts of the stationary contact lead-out ends 11 and 12, a preset gap exists between the upper magnetizer 61 and the lower magnetizer 62, and thus, a magnetic gap exists in the magnetic conductive loop.
The upper magnetizer is at least one in-line upper magnetizer, and the lower magnetizer is at least two U-shaped lower magnetizers; wherein, a U-shaped lower magnetizer and a corresponding in-line upper magnetizer form an independent magnetic conduction loop, and the two U-shaped lower magnetizers of two adjacent magnetic conduction loops are not contacted.
In this embodiment, two magnetic conductive loops are provided, and each of the two magnetic conductive loops is formed by matching an upper magnetic conductive body 61 in a straight shape with a lower magnetic conductive body 62 in a U shape; the two in-line upper magnetizers 61 are respectively fixed on the push rod component 3 in a riveting or welding mode, the two U-shaped lower magnetizers 62 are respectively fixed on the movable reed 2 in a riveting mode, and the top ends of the side walls of the two U-shaped lower magnetizers 62 are exposed on the upper surface of the movable reed.
In this embodiment, the through hole 22 of the movable spring 2 is configured to allow the side walls of the two U-shaped lower magnetizers to pass through.
In this embodiment, two magnetic conductive loops Φ1 and Φ (as shown in fig. 12) are provided, the two in-line upper magnetic conductors 61 are fixed on the push rod member 3, a certain gap is provided between the two in-line upper magnetic conductors 61, each side wall 621 of the two U-shaped lower magnetic conductors 62 is respectively attached to a corresponding side edge of the width of the movable reed 2, each other side wall 622 of the two U-shaped lower magnetic conductors 62 respectively passes through the same through hole 22 of the movable reed, and a gap is provided between each other side wall 622 of the two U-shaped lower magnetic conductors, so that the magnetic fluxes of the two magnetic conductive loops cannot cancel each other.
In this embodiment, the top ends of the side walls of the U-shaped lower magnetizer are substantially flush with the upper surface of the movable reed, i.e., the top ends of the side walls 621 and 622 of the U-shaped lower magnetizer 62 are substantially flush with the upper surface of the movable reed 2.
In this embodiment, the movable contact spring 2 is further provided with a widened portion 23 on each side of the width corresponding to the position of the through hole.
Because the invention has more than two magnetic conductive loops, the top ends of the four side walls (namely, two side walls 621 and two side walls 622) shared by the two U-shaped lower magnetic conductors 62 are matched with the upper magnetic conductor 61, namely, the two U-shaped lower magnetic conductors 62 have four magnetic pole faces, compared with the condition that only one magnetic conductive loop (only two magnetic pole faces) is maintained, the two magnetic pole faces (the two magnetic pole faces corresponding to the positions of the through holes are increased) are increased, so that the magnetic efficiency is improved, and the suction force is increased. When the movable reed 2 has high fault current, the two independent magnetic conduction loops, namely the magnetic conduction loop phi 1 and the magnetic conduction loop phi, generate suction force F to resist electric repulsive force generated by fault current between the movable reed and the static reed, thereby greatly improving the capability of resisting short-circuit current (fault current).
The magnetic conduction section of the magnetic circuit is insufficient due to the limitation of structural conditions, and one magnetic circuit is extremely easy to saturate under fault current, so that the suction force is not increased. The two magnetic loops of the embodiment of the invention are equivalent to dividing the current flowing direction into two section areas, each section area corresponds to a shunt current, the shunt current is less than half of the fault current basically, the magnetic loops are not magnetically saturated, the magnetic flux is increased, the generated attraction force is also increased, and the two magnetic loops of the invention are equivalent to one time of short-circuit resistance current of one magnetic loop in the prior art, and the number of the magnetic loops can be N according to the magnitude of the fault current of the system and the magnetic conduction sectional area.
The push rod component 3 comprises a U-shaped bracket 32, a spring seat 33 and a push rod 34, wherein the top of the push rod 34 is fixed with the spring seat 33, the bottom of the push rod 34 is connected with the movable iron core 5, the bottom of the U-shaped bracket 32 is fixed with the spring seat 33, the U-shaped bracket 32 and the spring seat 33 enclose a frame shape, the movable spring component 20 formed by the movable spring 2 and two U-shaped lower magnetizers 62 is installed in the frame shape enclosed by the U-shaped bracket and the spring seat 33 through the spring 31, the upper surface of the movable spring 2 is propped against the inner wall of the top of the U-shaped bracket 32, and the spring 31 is elastically propped between the bottom ends of the two U-shaped lower magnetizers 62 and the top end of the spring seat 33.
In this embodiment, positioning posts 623 for positioning the springs are further provided at the bottom ends of the two U-shaped lower magnetizers 62, respectively, so that the springs 31 are positioned outside the top of the springs 31 by the positioning posts 623. An annular positioning groove 331 for positioning the bottom of the spring is provided on the spring seat 33.
Of course, the positioning structure of the top of the spring may also be that the bottom ends of the two U-shaped lower magnetizers are respectively provided with a semicircular groove for positioning the spring, and the two semicircular grooves enclose a whole circle to be adapted to the top of the spring.
In this embodiment, the two U-shaped lower magnetizers are arranged side by side in the length direction of the movable reed, and of course, the two U-shaped lower magnetizers may be arranged in a staggered arrangement in the length direction of the movable reed.
When the push rod part 3 does not move upwards, the upper surface of the movable reed 2 is abutted against the bottom surface of the linear upper magnetizer 61 under the action of the spring 31, when the push rod part 3 moves to a proper position, the movable contacts at the two ends of the movable reed 2 are respectively contacted with the two fixed contact leading-out ends 11 and 12, then the push rod part 3 continues to move upwards, the linear upper magnetizer 61 also continues to move upwards along with the push rod part 3, the movable reed 2 cannot move upwards due to the fact that the movable reed 2 is contacted with the bottom ends of the two fixed contact leading-out ends 11 and 12, the overtravel of the contacts is realized, the spring 31 provides contact pressure, a certain gap is formed between the bottom end of the linear upper magnetizer 61 and the upper surface of the movable reed 2, and a magnetic gap is formed between the bottom surface of the linear upper magnetizer 61 and the top surface of the U-shaped lower magnetizer 62.
The invention relates to a direct current relay capable of extinguishing arc and resisting short-circuit current, which adopts two magnetic steels 71 respectively arranged at positions corresponding to dynamic and static contacts outside two ends of the length of a movable reed 2, and the magnetic poles of the opposite sides of the two magnetic steels 71 are opposite; the two magnetic steels 71 are also connected with two yoke iron clips 72, and the two yoke iron clips 72 at least comprise yoke iron segments 721 positioned at two sides of the width of the movable reed 2 and corresponding to the positions of the movable contacts; ; and an upper magnetizer 61 is arranged above the position between the two movable contacts of the movable reed 2, and a lower magnetizer 62 which can move together with the movable reed is arranged below the position between the two movable contacts of the movable reed 2; and the upper magnetizer 61 is fixed on the push rod part 3, and the lower magnetizer 62 is fixed on the movable reed 2; at least one through hole 22 is provided in the movable contact 2 at a position between the two movable contacts so that the upper and lower magnetic conductors 61 and 62 can approach each other or contact each other through the through hole 22, and at least two independent magnetic conductive loops are formed by the upper and lower magnetic conductors 61 and 62 over the width of the movable contact 2. According to the structure, on the basis of realizing arc extinction by using the two magnetic steels 71, the attraction force in the contact pressure direction is increased when the movable reed 2 fails to generate large current by using the pole faces of the magnetic conduction loops at the positions of the corresponding through holes, and the attraction force and the contact pressure are superposed together to resist electric repulsive force between the movable contact and the fixed contact, wherein the electric repulsive force is generated by failure current; the plurality of independent magnetic conduction loops basically divide the short-circuit heavy current equally, have the magnetic efficiency height, the difficult saturated characteristics of magnetic circuit.
The direct current relay capable of extinguishing arc and resisting short-circuit current adopts the structure that each independent magnetic conduction loop is formed by matching the upper linear magnetic conductor and the lower U-shaped magnetic conductor, and the direct current relay can use the same parts and has low cost; gaps exist among the U-shaped lower magnetizers; the upper magnetizer in a shape of a straight line is fixed on the push rod component; specifically, the two magnetic conductive loops in this embodiment are two, that is, there are two in-line upper magnetic conductors 61 and two U-shaped lower magnetic conductors 62, there is a gap between the two in-line upper magnetic conductors 61, there is a gap between the two U-shaped lower magnetic conductors 62, because the two U-shaped lower magnetic conductors 62 each have a side wall 622 penetrating through the through hole 22 of the movable reed, there is a gap between the side walls 622 of the two U-shaped lower magnetic conductors in the through hole 22 of the movable reed; the upper linear magnetizers 61 are respectively fixed on the push rod component 3 in a riveting or welding mode, the lower U-shaped magnetizers 62 are respectively fixed on the movable reed 2 in a riveting mode, and the top ends of the side walls of the lower U-shaped magnetizers 2 are exposed on the upper surface of the movable reed 2 to form an increased magnetic pole face so as to increase the suction force. The structure of the invention divides the movable reed 2 into a plurality of section areas, when the movable reed 2 passes through fault current, magnetic flux is generated on a plurality of magnetic conduction loops, suction force is generated among the magnetic conductors of each magnetic conduction loop, the suction force is the direction of increasing contact pressure and is used for resisting electric repulsive force among contacts, and because the plurality of magnetic conduction loops are used, each loop is difficult to saturate due to the fact that the fault current contained by each loop is only Imax/n, the larger the passing current is, the larger the contact pressure is increased, and the suction force generated by the magnetic conduction loop is also larger.
Example two
Referring to fig. 15 to 16, a dc relay capable of extinguishing arc and resisting short-circuit current according to the present invention is different from the first embodiment in that the upper magnetic conductor 61 is an upper yoke fixed to a housing for mounting two stationary contact lead-out terminals, such that when the movable contact of the movable reed 2 is not in contact engagement with the stationary contact of the stationary contact lead-out terminals 11, 12 (i.e., when the contacts are opened), a preset gap exists between the upper magnetic conductor 61 (upper yoke) and the lower magnetic conductor 62 (lower armature), and when the movable contact of the movable reed 2 is in contact engagement with the stationary contact of the stationary contact lead-out terminals 11, 12, the upper magnetic conductor 61 is in contact with the lower magnetic conductor 62, i.e., there is substantially no gap between the upper magnetic conductor 61 and the lower magnetic conductor 62.
Example III
Referring to fig. 17 to 19, a dc relay capable of extinguishing arc and resisting short-circuit current according to the present invention is different from the first embodiment in that the number of magnetic conductive loops is three, the movable reed 2 is provided with two through holes 22, and three U-shaped lower magnetic conductors 62 are sequentially arranged along the width of the movable reed 2, wherein two side walls 621 and 622 of one U-shaped lower magnetic conductor 62 in the middle respectively pass through the two through holes 22 of the movable reed, each side wall 621 of the two U-shaped lower magnetic conductors 62 on two sides respectively stick to a corresponding side of the width of the movable reed, each other side wall 622 of the two U-shaped lower magnetic conductors 62 on two sides respectively passes through the two through holes 22 of the movable reed, and a gap is provided between the side walls 622 of the two U-shaped lower magnetic conductors 62 in the same through hole 22 in the movable reed 2.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or be modified to equivalent embodiments, without departing from the scope of the technology. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (15)
1. A DC relay capable of extinguishing arc and resisting short-circuit current comprises two stationary contact leading-out ends, a movable reed with a straight piece, a push rod component and two magnetic steels; the movable reed is arranged on the push rod part so as to realize that the movable contacts at the two ends of the movable reed are matched with the fixed contacts at the bottom ends of the two fixed contact leading-out ends under the action of the push rod part; the method is characterized in that: the two pieces of magnetic steel are respectively arranged at positions corresponding to the dynamic contact points outside the two ends of the length of the movable reed, and the magnetic poles of the opposite surfaces of the two pieces of magnetic steel are opposite; the two pieces of magnetic steel are also connected with two yoke clamps, and the two yoke clamps at least comprise yoke sections which are positioned at two sides of the width of the movable reed and correspond to the positions of the movable contact points; an upper magnetizer distributed along the width of the movable reed is arranged above the position between the two movable contacts of the movable reed, and a lower magnetizer which is distributed along the width of the movable reed and can move along with the movable reed is arranged below the position between the two movable contacts of the movable reed; at least one through hole is arranged in the movable reed at the position between the two movable contacts of the movable reed, so that the upper magnetizer and the lower magnetizer can be mutually close to or mutually contacted through the through holes, and at least two independent magnetic conduction loops are formed on the width of the movable reed by the upper magnetizer and the lower magnetizer, so that when the movable reed breaks down with high current by utilizing pole faces of the magnetic conduction loops which are increased at the positions of the corresponding through holes, suction force in the contact pressure direction is generated, and electric repulsive force generated between the movable reed and a fixed contact leading-out end due to fault current is resisted.
2. The dc relay of claim 1, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the two pieces of magnetic steel are respectively arranged at the positions opposite to the dynamic and static contacts.
3. A dc relay according to claim 1 or 2, which is arc-extinguishing and resistant to short-circuit currents, characterized in that: the U-shaped bottom walls of the two yoke iron clamps are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other, and the end parts of the two side walls of the U-shaped two yoke iron clamps respectively form corresponding yoke iron sections.
4. A dc relay according to claim 1 or 2, which is arc-extinguishing and resistant to short-circuit currents, characterized in that: the U-shaped bottom walls of the two yoke iron clamps are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other, and the ends of the two side walls of the U-shaped two yoke iron clamps respectively exceed the positions of the two sides of the width of the movable reed, which correspond to the movable contact points; the two U-shaped side walls of the two yoke clamps contain the yoke sections.
5. A dc relay according to claim 1 or 2, which is arc-extinguishing and resistant to short-circuit currents, characterized in that: the U-shaped bottom walls of the two yoke iron clips are respectively matched with two sides of the width of the movable reed, and the ends of the two side walls of the U-shaped two yoke iron clips are respectively connected with one surfaces of the two magnetic steels, which are opposite to each other.
6. The dc relay of claim 1, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the upper magnetizer is at least one in-line upper magnetizer, and the lower magnetizer is at least two U-shaped lower magnetizers; wherein, a U-shaped lower magnetizer and a corresponding in-line upper magnetizer form an independent magnetic conduction loop, and the two U-shaped lower magnetizers of two adjacent magnetic conduction loops are not contacted.
7. The dc relay of claim 6, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: in at least two independent magnetic conduction loops, at least one group of two adjacent linear upper magnetic conductors of the two magnetic conduction loops are shared, and two U-shaped lower magnetic conductors of the two adjacent magnetic conduction loops are respectively matched below one linear upper magnetic conductor.
8. The dc relay of claim 6, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: in at least two independent magnetic conduction loops, the upper magnetic conductors of the straight line shapes of all the two adjacent magnetic conduction loops are two independent magnetic conduction loops, and the lower magnetic conductors of the two U shapes of the two adjacent magnetic conduction loops are respectively matched below the corresponding upper magnetic conductors of the straight line shapes.
9. The dc relay of claim 6, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the two magnetic conduction loops are two, the movable reed is provided with a through hole, one side wall of each U-shaped lower magnetizer is respectively attached to the corresponding side edge of the width of the movable reed, the other side wall of each U-shaped lower magnetizer respectively penetrates through the same through hole of the movable reed, and a gap is reserved between the other side walls of the two U-shaped lower magnetizers.
10. The dc relay of claim 9, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the other side walls of the two U-shaped lower magnetizers are distributed side by side or staggered in the same through hole of the movable reed along the length direction of the movable reed, so that the two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side or staggered along the length direction of the movable reed.
11. The dc relay of claim 6, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the two magnetic conduction loops are two, the movable reed is provided with two through holes, the two through holes are distributed side by side or are distributed in a staggered manner in the length direction of the movable reed, one side wall of each U-shaped lower magnetizer is respectively attached to the corresponding side edge of the width of the movable reed, and the other side wall of each U-shaped lower magnetizer is respectively matched in the two through holes of the movable reed, so that the two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side or are distributed in a staggered manner along the length direction of the movable reed.
12. The dc relay of claim 6, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the magnetic conduction loop is three, the movable reed is provided with two through holes, the three U-shaped lower magnetic conductors are sequentially arranged along the width of the movable reed, wherein two side walls of one U-shaped lower magnetic conductor in the middle respectively penetrate through the two through holes of the movable reed, one side wall of each of the two U-shaped lower magnetic conductors on two sides is respectively attached to the corresponding side edge of the width of the movable reed, the other side wall of each of the two U-shaped lower magnetic conductors on two sides respectively penetrates through the two through holes of the movable reed, and a gap is reserved between the two side walls in the same through hole in the movable reed.
13. The dc relay of claim 1, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the upper magnetic conductor is an upper armature, the upper armature is fixed on the push rod component, the lower magnetic conductor is a lower armature, the lower armature is fixed on the movable spring, the movable spring is installed in the push rod component through a spring, and when a movable contact of the movable spring is contacted with a fixed contact of the fixed contact leading-out end, a preset gap exists between the upper armature and the lower armature.
14. The dc relay of claim 1, wherein the dc relay is capable of quenching and is resistant to short circuit current, and wherein: the upper magnetic conductor is an upper yoke iron, the upper yoke iron is fixed on a shell for mounting two stationary contact leading-out ends, the lower magnetic conductor is a lower armature iron, the lower armature iron is fixed on the movable spring, the movable spring is mounted in the push rod component through a spring, and when the movable contact of the movable spring is contacted with the stationary contact of the stationary contact leading-out ends, the upper yoke iron is contacted with the lower armature iron.
15. A dc relay according to claim 13 or 14, wherein the relay is capable of quenching and is resistant to short-circuit currents, characterized in that: the push rod component comprises a U-shaped support, a spring seat and a push rod, wherein the top of the push rod is fixed with the spring seat, the bottom of the U-shaped support is fixed with the spring seat, a movable spring assembly formed by a movable spring and two U-shaped lower magnetizers is installed in the U-shaped support through a spring, the upper surface of the movable spring is propped against the inner wall of the top of the U-shaped support, and the spring is elastically propped against between the bottom ends of the two U-shaped lower magnetizers and the top end of the spring seat.
Priority Applications (26)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811624113.3A CN109659199B (en) | 2018-12-28 | 2018-12-28 | DC relay capable of extinguishing arc and resisting short-circuit current |
| KR1020237039041A KR102652524B1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| EP23202501.5A EP4283650A3 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| KR1020237039039A KR102652522B1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| EP23202516.3A EP4280246A3 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| US17/292,418 US11670472B2 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| EP23202507.2A EP4280245A3 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| KR1020217013254A KR102606473B1 (en) | 2018-11-09 | 2019-11-08 | Direct current relay to prevent short circuit current |
| EP23202491.9A EP4283649A3 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| JP2021524964A JP7341234B2 (en) | 2018-11-09 | 2019-11-08 | DC relay for short circuit current prevention |
| KR1020237039033A KR102652528B1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| EP23202512.2A EP4300534A3 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| PCT/CN2019/116808 WO2020094135A1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| EP19881489.9A EP3879553B1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| KR1020237039044A KR20230159645A (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| KR1020237039035A KR102652506B1 (en) | 2018-11-09 | 2019-11-08 | Direct-current relay resistant to short-circuit current |
| US18/305,376 US12020880B2 (en) | 2018-11-09 | 2023-04-23 | Direct-current relay having a function of extinguishing arc and resisting short-circuit current |
| US18/305,373 US12027333B2 (en) | 2018-11-09 | 2023-04-23 | Direct-current relay capable of extinguishing arc and resisting short-circuit current |
| US18/305,379 US12020881B2 (en) | 2018-11-09 | 2023-04-24 | Direct-current relay having a function of extinguishing ARC and resisting short-circuit current |
| US18/305,380 US12027335B2 (en) | 2018-11-09 | 2023-04-24 | Direct-current relay capable of extinguishing arc and resisting short-circuit current |
| US18/305,378 US12027334B2 (en) | 2018-11-09 | 2023-04-24 | Direct-current relay capable of extinguishing arc and resisting short-circuit current |
| JP2023134139A JP2023154101A (en) | 2018-11-09 | 2023-08-21 | Dc relay for preventing short-circuit current |
| JP2023134138A JP2023154100A (en) | 2018-11-09 | 2023-08-21 | Dc relay for preventing short-circuit current |
| JP2023134135A JP2023154097A (en) | 2018-11-09 | 2023-08-21 | Dc relay for preventing short-circuit current |
| JP2023134136A JP2023154098A (en) | 2018-11-09 | 2023-08-21 | Dc relay for preventing short-circuit current |
| JP2023134137A JP2023154099A (en) | 2018-11-09 | 2023-08-21 | Dc relay for preventing short-circuit current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811624113.3A CN109659199B (en) | 2018-12-28 | 2018-12-28 | DC relay capable of extinguishing arc and resisting short-circuit current |
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| CN109659199A CN109659199A (en) | 2019-04-19 |
| CN109659199B true CN109659199B (en) | 2024-05-14 |
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| CN201811624113.3A Active CN109659199B (en) | 2018-11-09 | 2018-12-28 | DC relay capable of extinguishing arc and resisting short-circuit current |
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| EP4283649A3 (en) | 2018-11-09 | 2024-02-21 | Xiamen Hongfa Electric Power Controls Co., Ltd. | Direct-current relay resistant to short-circuit current |
| CN110349811A (en) * | 2019-08-08 | 2019-10-18 | 东莞市中汇瑞德电子股份有限公司 | The resistance to shorting structure of high capacity relay |
| CN112582215B (en) * | 2019-09-27 | 2024-06-18 | 昆山国力源通新能源科技有限公司 | Contact structure of high-voltage direct-current relay |
| KR20220106218A (en) * | 2019-12-31 | 2022-07-28 | 샤먼 홍파 일렉트릭 파워 컨트롤즈 컴퍼니 리미티드 | DC relay capable of withstanding and extinguishing short-circuit current |
| CN113782391B (en) * | 2020-06-09 | 2024-01-09 | 比亚迪股份有限公司 | Relay device |
| CN113782392B (en) * | 2020-06-09 | 2023-04-07 | 比亚迪股份有限公司 | Relay with a movable contact |
| CN112563079B (en) * | 2020-11-30 | 2024-02-20 | 武汉同力同为科技有限公司 | Movable contact bridge retaining structure of short-circuit resistance lifting switch device |
| CN112542331B (en) * | 2020-11-30 | 2024-02-23 | 武汉同力同为科技有限公司 | Movable contact bridge retaining structure of short-circuit resistance lifting switch device |
| CN117912899A (en) * | 2022-10-12 | 2024-04-19 | 厦门宏发电力电器有限公司 | Relay device |
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