CN212032959U - Direct current relay capable of resisting short-circuit current - Google Patents
Direct current relay capable of resisting short-circuit current Download PDFInfo
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- CN212032959U CN212032959U CN201922495119.1U CN201922495119U CN212032959U CN 212032959 U CN212032959 U CN 212032959U CN 201922495119 U CN201922495119 U CN 201922495119U CN 212032959 U CN212032959 U CN 212032959U
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- upper yoke
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Abstract
The utility model discloses a direct current relay capable of resisting short circuit current, which comprises two stationary contact leading-out ends, a straight movable reed, a pushing rod component, an upper yoke, a lower armature and a yoke plate; the yoke iron plate is also provided with a first U-shaped bracket in an inverted shape, the top wall of the first U-shaped bracket is positioned above the push rod component, the upper yoke iron is fixed on the inner side of the top wall of the first U-shaped bracket, the lower armature iron is fixed at the bottom end of the movable spring, when the contact is closed, the two ends of the lower armature iron are respectively close to or contacted with the two ends of the upper yoke iron, so that a surrounding magnetic conduction ring is formed on the movable spring, and when the movable spring has a large fault current, electromagnetic suction in the contact pressure direction is generated to resist the electric repulsion force generated between the movable spring and the stationary contact leading-out end due to the fault current. The utility model discloses can increase electromagnetic suction to greatly improve the anti short circuit ability of product.
Description
Technical Field
The utility model relates to a relay technical field especially relates to a can anti short-circuit current's direct current relay.
Background
The short-circuit resistance of the direct-current relay is a relatively difficult index at present, and the short-circuit resistance current of the direct-current relay reaches the level of 16kA at present. When short-circuit current passes through the movable and fixed contacts, electric repulsion force generated between the movable and fixed contacts can cause the contacts to be repelled, and finally severe arcing is caused, so that the relay is disabled. The anti-short circuit is fundamentally ensured to be reliably contacted with the contact without bouncing off. In the prior art, a magnetic conductive ring for resisting short-circuit current, which is composed of an upper yoke and a lower armature, is generally additionally arranged at a movable spring, when the short-circuit current flows through the movable spring, an annular magnetic field is generated at the periphery of the movable spring, and when the annular magnetic field acts on the upper yoke and the lower armature, the upper yoke and the lower armature generate suction force, the upper yoke is fixed on the inner side of the top wall of a U-shaped bracket of a push rod component, and the lower armature is fixed on the bottom surface of the movable spring, so that the magnetic conductive ring composed of the upper yoke and the lower armature forms a suction force in a contact pressure direction to the movable spring, and a movable contact and a static contact are prevented from bouncing. The larger the short-circuit current is, the denser the magnetic induction lines acting on the magnetic conductive ring is, and at the moment, the magnetic induction lines increase gradually instantly to generate larger electromagnetic attraction force between the upper yoke and the lower armature. According to the short-circuit resisting structure, the upper yoke iron is fixed at the U-shaped support of the pushing rod component, the upper yoke iron can move along with the movement of the pushing rod component, moving and static contacts are contacted in an overtravel stage, the pushing rod component can continue to move upwards, the spring is compressed to form contact pressure, and the upper yoke iron is fixed on the inner side of the top wall of the U-shaped support of the pushing rod component, so that a gap is formed between the upper yoke iron and the lower yoke iron, and the electromagnetic attraction is weakened. Because the upper yoke is fixed on the follow-up push rod, the push rod is kept immovable by means of the suction force of the iron core, when the short-circuit current is large to a certain degree, the electromagnetic suction force generated between the short-circuit rings is also large, for example, 105N is achieved, at the moment, the suction force of the iron core is only 100N by means of the suction force generated by the coil, the iron core is not kept in the relay, the iron core is released, and the contacts are separated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a can anti short-circuit current's direct current relay, through the improvement of antagonism short circuit structure, can increase electromagnetic suction to greatly improve the anti short circuit ability of product, possess the rank that anti short-circuit current reaches 16 kA.
The utility model provides a technical scheme that its technical problem adopted is: a direct current relay capable of resisting short-circuit current comprises two stationary contact leading-out terminals, a straight movable reed, a pushing rod component, an upper yoke iron, a lower armature iron and a yoke iron plate; the movable spring is arranged in the pushing rod component so as to realize the matching of movable contacts at two ends of the movable spring and the fixed contacts at the bottom ends of leading-out ends of the two fixed contacts under the action of the pushing rod component; the upper yoke iron and the lower armature iron are respectively arranged at the positions matched with the movable spring leaf and are positioned above the yoke iron plate; the yoke iron plate is also provided with a first U-shaped bracket in an inverted shape, the top wall of the first U-shaped bracket is positioned above the push rod component, the upper yoke iron is fixed on the inner side of the top wall of the first U-shaped bracket, the lower armature iron is fixed at the bottom end of the movable spring, when the contact is closed, the two ends of the lower armature iron are respectively close to or contacted with the two ends of the upper yoke iron, so that a surrounding magnetic conduction ring is formed on the movable spring, and when the movable spring has a large fault current, electromagnetic suction in the contact pressure direction is generated to resist the electric repulsion force generated between the movable spring and the stationary contact leading-out end due to the fault current.
The upper yoke iron is correspondingly arranged above the push rod component at the position between two movable contacts of the movable spring and distributed along the width of the movable spring, and the lower armature iron is correspondingly matched with the upper yoke iron.
The push rod part comprises a second U-shaped support in an inverted shape, a spring seat and a push rod, the top of the push rod is fixed with the spring seat, the bottom of the push rod penetrates through the yoke plate downwards, the bottom of the second U-shaped support is fixed with the spring seat, and the spring abuts between a lower armature at the bottom end of the movable reed and the spring seat.
And the bottom end of the lower armature is provided with a mounting groove used for matching the spring.
The upper yoke iron is in a straight shape, the lower armature iron is in a U-shaped shape, and the top wall of the second U-shaped support is provided with a through hole which enables the two U-shaped side walls of the lower armature iron to penetrate upwards to be contacted with or close to the upper yoke iron above; the U-shaped lower armature iron and the straight-shaped upper yoke iron form a magnetic conduction ring.
Steps are further arranged on two side walls of the U-shaped of the lower armature, and convex parts are formed on parts of the steps on the two side walls of the U-shaped of the lower armature to penetrate through the through hole in the top wall of the second U-shaped support to be in contact with or close to the upper yoke iron.
The thickness of the upper yoke iron is larger than or equal to that of the lower armature iron.
The first U-shaped bracket is made of diamagnetic materials or weak magnetic materials.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses owing to adopted still to be equipped with a first U type support that is the shape of invering on yoke plate to make the roof of first U type support be in promote the top of pole part, the upper yoke is fixed the roof of first U type support is inboard, the bottom at the movable reed is fixed to the lower armature, when the contact is closed, the both ends of lower armature respectively with the both ends of upper yoke are close to mutually or contact, thereby form a magnetic ring that encircles on the movable reed. The utility model discloses a this kind of structure can produce the ascending electromagnetic suction of contact pressure side when the movable contact spring breaks down the heavy current, removes to resist movable contact spring and stationary contact and draws forth the electronic repulsion that produces because of the fault current between the end. The suction force of the short circuit ring is transmitted to the inverted U-shaped support, the first U-shaped support is supported on the yoke plate, no matter how large the current is, the suction force generated by the short circuit ring is large, the stress of the upper yoke is transmitted to the yoke plate and the support of the first U-shaped support, and the stress is transmitted to the inverted U-shaped support, so that the holding force of the iron core is not influenced.
The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the present invention is not limited to the embodiment.
Drawings
Fig. 1 is a perspective view of a partial structure of an embodiment of the present invention;
fig. 2 is a partially constructed exploded perspective view of the embodiment of the present invention;
fig. 3 is a top view of a partial configuration of an embodiment of the present invention;
FIG. 4 is a front view of a partial configuration of an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
fig. 6 is a schematic view of the upper yoke and the first U-shaped bracket according to the embodiment of the present invention;
FIG. 7 is a perspective view of the movable spring plate, lower armature and push rod assembly of the embodiment of the present invention;
FIG. 8 is a front view of the movable spring plate, lower armature and push rod assembly of the embodiment of the present invention in cooperation;
fig. 9 is a schematic configuration diagram of a second U-shaped bracket according to an embodiment of the present invention;
fig. 10 is a schematic view of the construction of a lower armature of an embodiment of the present invention.
Detailed Description
Examples
Referring to fig. 1 to 10, the dc relay of the present invention includes two stationary contact terminals 1, a straight movable spring piece 2, a push rod member 3, an upper yoke 4, a lower armature 5, and a yoke plate 6; the movable spring leaf 2 is arranged in the push rod part 3, so that the movable contacts at two ends of the movable spring leaf 2 are matched with the static contacts at the bottom ends of the two static contact leading-out ends 1 under the action of the push rod part 3; in this embodiment, the two end portions of the movable spring piece 2 form the movable contact of the movable spring piece 2, and the bottom end portion of the stationary contact leading-out end 1 forms the stationary contact of the stationary contact leading-out end 1; the upper yoke iron 4 and the lower armature iron 5 are respectively arranged at the positions matched with the movable spring and are positioned above the yoke iron plate 6; the yoke iron plate 6 is also provided with a first U-shaped bracket 7 in an inverted shape, the top wall 71 of the first U-shaped bracket 7 is positioned above the push rod part 3, the upper yoke iron 4 is fixed on the inner side of the top wall 71 of the first U-shaped bracket 7, the lower armature iron 5 is fixed at the bottom end of the movable reed 2, when the contact is closed, two ends of the lower armature iron 5 are respectively close to or contacted with two ends of the upper yoke iron 4, so that a surrounding magnetic conduction ring is formed on the movable reed 2, when the movable reed 2 has large fault current, electromagnetic attraction in the contact pressure direction is generated to resist the electric repulsion force between the movable reed 2 and the stationary contact leading-out end 1 generated by the fault current.
In the present embodiment, the upper yoke 4 corresponds to the upper side of the push rod member 3 at a position between two movable contacts of the movable spring 2 and is distributed along the width of the movable spring 2, and the lower armature 5 corresponds to and matches the upper yoke 4.
In this embodiment, the push rod part 3 includes an inverted second U-shaped bracket 31, a spring 32, a spring seat 33, and a push rod 34, the top of the push rod 34 is fixed to the spring seat 33, the bottom of the push rod 34 passes through the yoke plate 6 downward, the bottom of the second U-shaped bracket 31 is fixed to the spring seat 33, and the spring 32 abuts between the lower armature 5 at the bottom end of the movable spring leaf 2 and the spring seat 33.
In this embodiment, the bottom end of the lower armature 5 is provided with a mounting groove for fitting the spring 32.
In this embodiment, the upper yoke 4 is in a shape of a straight line, the lower armature 5 is in a shape of a U, and the top wall 311 of the second U-shaped bracket 31 is provided with a through hole 312 through which two U-shaped side walls of the lower armature 5 penetrate upward to contact or approach the upper yoke 4 above; the U-shaped lower armature 5 and the straight-line-shaped upper yoke iron 4 form a magnetic conductive ring.
In this embodiment, two side walls of the U shape of the lower armature 5 are further provided with steps 52, and portions of the steps on the two side walls of the U shape of the lower armature form protrusions 52 to penetrate through the through hole 312 of the top wall 311 of the second U-shaped bracket 31 to contact or approach the upper yoke 4.
In the present embodiment, the thickness of the upper yoke 4 is larger than the thickness of the lower armature 5. The suction force of the upper yoke 4 to the lower armature 5 can be increased by increasing the thickness of the upper yoke 4.
In this embodiment, the first U-shaped bracket 7 is made of diamagnetic material or weakly magnetically permeable material. For example, non-magnetic stainless steel, aluminum material, etc. are used.
When a short-circuit current passes through an annular magnetic circuit formed by the upper yoke 4 (anti-short circuit ring) and the lower armature 5 (anti-short circuit ring), the annular yoke magnetic circuit also generates electromagnetic attraction, and at the moment, because the upper yoke 4 (anti-short circuit ring) is regarded as a rigid fixed support, the lower armature 5 (anti-short circuit ring) is attracted upwards by the electromagnetic attraction between the upper yoke 4 (anti-short circuit ring) and the lower armature 5 (anti-short circuit ring). Once the lower armature 5 (anti-short-circuit ring) moves upward, it pushes the movable spring 2 upward. The larger the short-circuit current, the larger the upward thrust. Under the conditions of relay power consumption determination and contact pressure determination, the short-circuit current not only causes electric repulsion force of two contact points, but also generates upward electromagnetic attraction force due to the anti-short-circuit structure. At this time, through adjustment: the large spring 32 compresses the contact pressure generated by the over travel + the sum of the electromagnetic attraction between the upper yoke 4 (anti-short-circuit loop) and the lower armature 5 (anti-short-circuit loop) > the sum of the short-circuit electric repulsion of the two contacts. At this time, when the short circuit current passes through, the contact still reliably contacts, the arc can not be flicked, and the system is in a safer state.
The utility model discloses a can resist short-circuit current's direct current relay has adopted still to be equipped with one on yoke plate 6 and is the first U type support 7 of invering the shape to make the roof 71 of first U type support 7 be in the top of catch bar part 3, it fixes to go up yoke 4 the roof 71 of first U type support 7 is inboard, armature 5 fixes the bottom at movable contact spring 2 down, when the contact is closed, the both ends of lower armature 5 respectively with the both ends of going up yoke 4 are close to mutually or contact, thereby form a magnetic ring that encircles on movable contact spring 2. The utility model discloses a this kind of structure can produce the ascending electromagnetic suction of contact pressure side when movable contact spring 2 breaks down the heavy current, removes to resist movable contact spring and stationary contact and draws forth the electronic repulsion that produces because of the fault current between the end. The suction force of the short circuit ring is transmitted to the inverted U-shaped support, the first U-shaped support is supported on the yoke plate, no matter how large the current is, the suction force generated by the short circuit ring is large, the stress of the upper yoke is transmitted to the yoke plate and the support of the first U-shaped support, and the stress is transmitted to the inverted U-shaped support, so that the holding force of the iron core is not influenced.
The utility model discloses a but anti short-circuit current's direct current relay, iron core holding power requirement is little, does benefit to the on-load switch-on actuation.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solutions disclosed above can be used by those skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. A direct current relay capable of resisting short-circuit current comprises two stationary contact leading-out terminals, a straight movable reed, a pushing rod component, an upper yoke iron, a lower armature iron and a yoke iron plate; the movable spring is arranged in the pushing rod component so as to realize the matching of movable contacts at two ends of the movable spring and the fixed contacts at the bottom ends of leading-out ends of the two fixed contacts under the action of the pushing rod component; the upper yoke iron and the lower armature iron are respectively arranged at the positions matched with the movable spring leaf and are positioned above the yoke iron plate; the yoke iron plate is also provided with a first U-shaped bracket in an inverted shape, the top wall of the first U-shaped bracket is positioned above the push rod component, the upper yoke iron is fixed on the inner side of the top wall of the first U-shaped bracket, the lower armature iron is fixed at the bottom end of the movable spring, when the contact is closed, the two ends of the lower armature iron are respectively close to or contacted with the two ends of the upper yoke iron, so that a surrounding magnetic conduction ring is formed on the movable spring, and when the movable spring has a large fault current, electromagnetic suction in the contact pressure direction is generated to resist the electric repulsion force generated between the movable spring and the stationary contact leading-out end due to the fault current.
2. The short-circuit current resistant direct current relay according to claim 1, characterized in that: the upper yoke iron is correspondingly arranged above the push rod component at the position between two movable contacts of the movable spring and distributed along the width of the movable spring, and the lower armature iron is correspondingly matched with the upper yoke iron.
3. The short-circuit current resistant direct current relay according to claim 1 or 2, characterized in that: the push rod part comprises a second U-shaped support in an inverted shape, a spring seat and a push rod, the top of the push rod is fixed with the spring seat, the bottom of the push rod penetrates through the yoke plate downwards, the bottom of the second U-shaped support is fixed with the spring seat, and the spring abuts between a lower armature at the bottom end of the movable reed and the spring seat.
4. The short-circuit current resistant direct current relay according to claim 3, characterized in that: and the bottom end of the lower armature is provided with a mounting groove used for matching the spring.
5. The short-circuit current resistant direct current relay according to claim 3, characterized in that: the upper yoke iron is in a straight shape, the lower armature iron is in a U-shaped shape, and the top wall of the second U-shaped support is provided with a through hole which enables the two U-shaped side walls of the lower armature iron to penetrate upwards to be contacted with or close to the upper yoke iron above; the U-shaped lower armature iron and the straight-shaped upper yoke iron form a magnetic conduction ring.
6. The short-circuit current resistant direct current relay according to claim 5, characterized in that: steps are further arranged on two side walls of the U-shaped of the lower armature, and convex parts are formed on parts of the steps on the two side walls of the U-shaped of the lower armature to penetrate through the through hole in the top wall of the second U-shaped support to be in contact with or close to the upper yoke iron.
7. The short-circuit current resistant direct current relay according to claim 1, characterized in that: the thickness of the upper yoke iron is larger than or equal to that of the lower armature iron.
8. The short-circuit current resistant direct current relay according to claim 1, characterized in that: the first U-shaped bracket is made of diamagnetic materials or weak magnetic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495119.1U CN212032959U (en) | 2019-12-31 | 2019-12-31 | Direct current relay capable of resisting short-circuit current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495119.1U CN212032959U (en) | 2019-12-31 | 2019-12-31 | Direct current relay capable of resisting short-circuit current |
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| Publication Number | Publication Date |
|---|---|
| CN212032959U true CN212032959U (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922495119.1U Active CN212032959U (en) | 2019-12-31 | 2019-12-31 | Direct current relay capable of resisting short-circuit current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023108827A1 (en) * | 2021-12-13 | 2023-06-22 | 三友联众集团股份有限公司 | Anti-short circuit relay |
| WO2024078424A1 (en) * | 2022-10-12 | 2024-04-18 | 厦门宏发电力电器有限公司 | Relay |
-
2019
- 2019-12-31 CN CN201922495119.1U patent/CN212032959U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023108827A1 (en) * | 2021-12-13 | 2023-06-22 | 三友联众集团股份有限公司 | Anti-short circuit relay |
| WO2024078424A1 (en) * | 2022-10-12 | 2024-04-18 | 厦门宏发电力电器有限公司 | Relay |
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