CN109559939B - Direct current relay resistant to short-circuit current - Google Patents
Direct current relay resistant to short-circuit current Download PDFInfo
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- CN109559939B CN109559939B CN201811330771.1A CN201811330771A CN109559939B CN 109559939 B CN109559939 B CN 109559939B CN 201811330771 A CN201811330771 A CN 201811330771A CN 109559939 B CN109559939 B CN 109559939B
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- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 165
- 239000004020 conductor Substances 0.000 claims description 70
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 52
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 230000003068 static effect Effects 0.000 claims description 21
- 230000004907 flux Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 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
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 238000010276 construction Methods 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
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- Electromagnets (AREA)
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Abstract
The invention discloses a direct current relay resistant to short-circuit current, which comprises two stationary contact leading-out ends, a movable reed and a push rod component, wherein an upper magnetizer is arranged above a preset position of the movable reed, and a lower magnetizer capable of moving along with the movable reed is arranged below the preset position of the movable reed; at least one through hole is arranged in the movable reed at the preset 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. The invention can utilize the pole faces of each magnetic conduction loop at the corresponding through hole position to generate suction force in the contact pressure direction when the movable reed breaks down and generates large current, so as to resist the electric repulsive force generated between the movable reed and the fixed contact leading-out end due to fault current, and has the characteristics of high magnetic efficiency and difficult saturation of a magnetic circuit.
Description
Technical Field
The invention relates to the technical field of relays, in particular to a direct current relay resistant to 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. When the fault short-circuit current occurs, the direct current relay in the prior art can generate electric repulsive force between the movable contact and the static contact, and influence the stability of contact between the movable contact and the static contact.
With the rapid development of new energy industry, the requirements of various factories and battery packs on fault short-circuit current are higher and higher, and on the basis of keeping the small size, the direct-current relay is required to have a short-circuit resistance function, and auxiliary suction force can be provided when a system breaks down and has high current so as to resist electric repulsive force suffered by a movable spring. Typical input short-circuit resistance requirements of the current market are 8000A,5ms are not burnt or fried; 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 applied by the movable spring, so that the market requirement is difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the direct current relay for resisting the short-circuit current, which can provide enough contact pressure to resist the electric repulsive force caused by the large short-circuit current received by the movable spring under the characteristic of keeping the small volume of a product 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 direct current relay for resisting short-circuit current comprises two static contact leading-out ends, a straight movable reed and a push rod part, wherein the movable reed is arranged on the push rod part, so that the movable contacts at the two ends of the movable reed are contacted with the static contacts at the bottom ends of the two static contact leading-out ends under the action of the push rod part, and the current flows in from one static contact leading-out end and flows out from the other static contact leading-out end after passing through the movable reed; an upper magnetizer distributed along the width of the movable reed is arranged above one preset position 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 preset position of the movable reed; at least one through hole is arranged in the movable reed at the preset position, 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 corresponding through holes, 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 preset position is between two movable contacts of the movable reed, which correspond to the length.
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.
And the other side walls of the two U-shaped lower magnetizers are distributed in the same through hole of the movable reed side by side along the length direction of the movable reed, so that two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side along the length direction of the movable reed.
The other side walls of the two U-shaped lower magnetizers are distributed in the same through hole of the movable reed in a staggered manner along the length direction of the movable reed, so that two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed in a staggered manner along the length direction of the movable reed.
The movable reed is provided with two through holes, the two through holes are distributed side by side 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 conductive loops corresponding to the two U-shaped lower magnetizers are distributed side by side along the length direction of the movable reed.
The movable reed is provided with two through holes, the two through holes 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 conductive loops corresponding to the two U-shaped lower magnetizers 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 top end of the side wall of the U-shaped lower magnetizer is approximately flush with the upper surface of 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.
The bottom ends of the two U-shaped lower magnetizers are respectively provided with a semicircular groove for positioning the springs, and the two semicircular grooves are enclosed into a whole circle so as to be adapted to the tops of the springs.
And the bottom ends of the two U-shaped lower magnetizers are respectively provided with a positioning column for positioning the springs, so that the springs are positioned outside the tops of the springs by using the positioning columns.
In the movable reed, widened parts are respectively arranged at two sides of the width corresponding to the through hole positions.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention adopts the structure that the upper magnetizer is arranged above one preset position of the movable reed, and the lower magnetizer which can move along with the movable reed is arranged below one preset position of the movable reed; at least one through hole is formed in the movable reed at the preset position, so that the upper magnetizer and the lower magnetizer can be mutually close to or mutually contacted through the through holes, at least two independent magnetic conduction loops are formed on the width of the movable reed by the upper magnetizer and the lower magnetizer, and when the movable reed breaks down with high current by utilizing pole faces of the magnetic conduction loops at the positions of the corresponding through holes, the attraction force in the contact pressure direction is increased, and the attraction force and the contact pressure are overlapped to resist electric repulsive force generated between the movable contact and the fixed contact due to 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; but a dc relay resistant to short-circuit current of the present invention is not limited to the embodiment.
Drawings
Fig. 1 is a sectional view of a part of the structure (corresponding to a section along the length of a movable reed) of the first embodiment of the present invention;
Fig. 2 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. 3 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. 4 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. 5 is a schematic diagram showing the cooperation of the movable reed and the upper and lower magnetic conductors according to the first embodiment of the present invention;
fig. 6 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. 7 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. 8 is a schematic diagram of the cooperation of the movable reed and the lower magnetic conductor in the first embodiment of the present invention;
Fig. 9 is a schematic diagram of a dual magnetic circuit according to a first embodiment of the present invention;
fig. 10 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. 11 is a schematic view of the stationary contact lead-out end and movable contact spring being mated (contact-contacted) in accordance with the first embodiment of the present invention;
fig. 12 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. 13 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. 14 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 15 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. 16 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 11, a dc relay for resisting a short-circuit current according to the present invention includes two stationary contact lead-out terminals 11 and 12 for respectively flowing in and out a current, a movable reed 2 of a straight sheet type, and a push rod member 3 for driving the movable reed 2 to move so as to contact or disconnect the movable contacts at both ends of the movable reed with the stationary contacts at the bottom ends of the stationary contact lead-out terminals; 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); an upper magnetizer 61 is arranged above a preset position of the movable reed 2, in the embodiment, the upper magnetizer 61 is an upper armature, and a lower magnetizer 62 capable of moving along with the movable reed is arranged below the preset position of the movable reed 2, 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 arranged in the movable reed at the preset position, so that the upper magnetizer 61 and the lower magnetizer 62 can be mutually close to or mutually contacted through the through hole 22, and at least two independent magnetic conduction loops are formed on the width of the movable reed 2 by the upper magnetizer 61 and the lower magnetizer 62, so that when the movable reed 2 has high fault current by utilizing pole faces of the magnetic conduction loops which are increased at the corresponding through hole positions, 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 fault current is resisted. Wherein, the upper magnetizer and the lower magnetizer can be made of iron, cobalt, nickel, alloy thereof and other materials.
By two independent magnetic conductive loops is meant that the two magnetic conductive loops do not interfere with each other, i.e. the magnetic fluxes do not cancel each other.
The preset position is between two movable contacts of the movable reed corresponding to the length, and in this embodiment, the preset position is approximately the middle 21 of the length of the movable reed 2.
In this embodiment, as shown in fig. 10 and 11, 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 with 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. 9) 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 for resisting short-circuit current, which adopts an upper magnetizer 61 arranged above a preset position of a movable reed 2, and a lower magnetizer 62 which can move along with the movable reed is arranged below the preset position 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 arranged in the movable reed 2 at the preset position, so that the upper magnetizer 61 and the lower magnetizer 62 can be mutually close to or mutually contacted through the through hole 22, and at least two independent magnetic conduction loops are formed by the upper magnetizer 61 and the lower magnetizer 62 on the width of the movable reed 2, 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, the attraction force in the contact pressure direction is increased, and the attraction force and the contact pressure are overlapped together to resist the electric repulsive force generated between the movable contact and the fixed contact due to 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.
The direct current relay resistant to short-circuit current adopts the structure that each independent magnetic conduction loop is formed by matching the upper magnetic conductor in a straight shape with the lower magnetic conductor in a U shape, 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. 12 to 13, a dc relay resistant to short-circuit current according to the present invention is different from the first embodiment in that the upper magnetizer 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 magnetizer 61 (upper yoke) and the lower magnetizer 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 magnetizer 61 is in contact with the lower magnetizer 62, i.e., there is substantially no gap between the upper magnetizer 61 and the lower magnetizer 62.
Example III
Referring to fig. 14 to 16, the dc relay for 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 pass 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 (22)
1. A direct current relay for resisting short-circuit current comprises two static contact leading-out ends, a straight movable reed and a push rod part, wherein the movable reed is arranged on the push rod part, so that the movable contacts at the two ends of the movable reed are contacted with the static contacts at the bottom ends of the two static contact leading-out ends under the action of the push rod part, and the current flows in from one static contact leading-out end and flows out from the other static contact leading-out end after passing through the movable reed; the method is characterized in that: an upper magnetizer distributed along the width of the movable reed is arranged above one preset position 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 preset position of the movable reed; at least one through hole is arranged in the movable reed at the preset position, 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 corresponding through holes, 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.
2. The short-circuit current resistant direct current relay according to claim 1, wherein: the preset position is between two movable contacts of the movable reed, which correspond to the length.
3. A dc relay resistant to short-circuit currents according to claim 1 or 2, characterised in that: 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.
4. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
5. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
6. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
7. The short-circuit current resistant direct current relay according to claim 6, wherein: and the other side walls of the two U-shaped lower magnetizers are distributed in the same through hole of the movable reed side by side along the length direction of the movable reed, so that two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed side by side along the length direction of the movable reed.
8. The short-circuit current resistant direct current relay according to claim 6, wherein: the other side walls of the two U-shaped lower magnetizers are distributed in the same through hole of the movable reed in a staggered manner along the length direction of the movable reed, so that two magnetic conduction loops corresponding to the two U-shaped lower magnetizers are distributed in a staggered manner along the length direction of the movable reed.
9. A dc relay resistant to short-circuit current according to claim 3, characterized in that: the movable reed is provided with two through holes, the two through holes are distributed side by side 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 conductive loops corresponding to the two U-shaped lower magnetizers are distributed side by side along the length direction of the movable reed.
10. A dc relay resistant to short-circuit current according to claim 3, characterized in that: the movable reed is provided with two through holes, the two through holes 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 conductive loops corresponding to the two U-shaped lower magnetizers are distributed in a staggered manner along the length direction of the movable reed.
11. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
12. A dc relay against short-circuit current according to any of claims 6 to 11, characterized in that: the top end of the side wall of the U-shaped lower magnetizer is approximately flush with the upper surface of the movable reed.
13. A dc relay against short-circuit current according to any one of claims 1 or 2 or 4 to 11, characterized in that: 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. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
15. The short-circuit current resistant direct current relay according to claim 12, 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.
16. A dc relay against short-circuit current according to any one of claims 1 or 2 or 4 to 11, characterized in that: 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.
17. A dc relay resistant to short-circuit current according to claim 3, characterized in that: 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.
18. The short-circuit current resistant direct current relay according to claim 12, 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.
19. A dc relay as claimed in any one of claims 13 to 18, wherein: 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.
20. The short-circuit current resistant direct current relay of claim 19, wherein: the bottom ends of the two U-shaped lower magnetizers are respectively provided with a semicircular groove for positioning the springs, and the two semicircular grooves are enclosed into a whole circle so as to be adapted to the tops of the springs.
21. The short-circuit current resistant direct current relay of claim 19, wherein: and the bottom ends of the two U-shaped lower magnetizers are respectively provided with a positioning column for positioning the springs, so that the springs are positioned outside the tops of the springs by using the positioning columns.
22. A dc relay resistant to short-circuit currents according to claim 1 or 2, characterised in that: in the movable reed, widened parts are respectively arranged at two sides of the width corresponding to the through hole positions.
Priority Applications (26)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811330771.1A CN109559939B (en) | 2018-11-09 | 2018-11-09 | Direct current relay resistant to 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 |
| JP2023134137A JP2023154099A (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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811330771.1A CN109559939B (en) | 2018-11-09 | 2018-11-09 | Direct current relay resistant to short-circuit current |
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| CN109559939A CN109559939A (en) | 2019-04-02 |
| CN109559939B true CN109559939B (en) | 2024-05-14 |
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| CN201811330771.1A Active CN109559939B (en) | 2018-11-09 | 2018-11-09 | Direct current relay resistant to short-circuit current |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4283649A3 (en) | 2018-11-09 | 2024-02-21 | Xiamen Hongfa Electric Power Controls Co., Ltd. | Direct-current relay resistant to short-circuit current |
| CN113035648B (en) * | 2019-12-25 | 2024-06-25 | 华为数字能源技术有限公司 | Contact device and electromagnetic switch |
| 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 |
| CN114582675A (en) * | 2020-12-01 | 2022-06-03 | 上海良信电器股份有限公司 | Easy-to-assemble contact assembly capable of resisting short-circuit current direct current contactor |
| CN216120109U (en) * | 2021-09-10 | 2022-03-22 | 厦门宏发电力电器有限公司 | High-voltage direct-current relay capable of enhancing arc extinguishing capability |
| WO2024114773A1 (en) * | 2022-12-01 | 2024-06-06 | 厦门宏发电力电器有限公司 | Relay |
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| WO2012007802A1 (en) * | 2010-07-16 | 2012-01-19 | パナソニック電工株式会社 | Contact apparatus |
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