CN218939543U - Electromagnetic relay with high withstand voltage - Google Patents

Abstract

The utility model discloses a high-withstand-voltage electromagnetic relay, which comprises a base part and a movable spring armature part, wherein the base part comprises a base, a coil, an iron core and at least one static spring part, wherein the coil, the iron core and the at least one static spring part are arranged on the base; the movable spring armature component comprises at least one movable spring part, an armature, magnetic steel and a plastic body, wherein a welding sheet structure is arranged at the middle part of the movable spring armature component, and the movable spring armature component is arranged at the top of the base part through the welding sheet structure; the static spring part is matched with the movable spring part, the movable spring part comprises two movable reeds and a conducting strip, and the two movable reeds are respectively and integrally formed or electrically connected with the conducting strip; the movable spring part is positioned above the armature, the two movable spring plates are respectively positioned above two sides of the armature in the width direction, the conducting strip stretches across the armature, and the conducting strip and the two movable spring plates are positioned on the same side of the welding strip structure. The utility model greatly shortens the conductive path of the movable spring part, thereby greatly reducing the contact resistance.

Description

Electromagnetic relay with high withstand voltage

Technical Field

The utility model relates to the technical field of relays, in particular to a high-voltage-resistant electromagnetic relay.

Background

Along with the rapid development of new energy industry, the application of high-voltage direct current is more and more popular and the requirements are higher, and the requirements on the relay are more and more strict. Miniaturized high withstand voltage specification relays are increasingly favored in the market, but traditional miniaturized relays are affected by volume and have limited withstand voltage capability. Therefore, the user connects two contacts in series in the external circuit to improve the voltage withstand capability between the open contacts, which results in a cumbersome circuit design. For this reason, the prior art presents a high-voltage type normally open miniature relay which is directly connected in series inside the relay, without the user having to make a series connection on an external board. The miniature relay comprises a base part and a movable spring armature part, wherein the middle part of the movable spring armature part is arranged at the top of the base part through a soldering lug structure, the movable spring armature part comprises a movable spring part, an armature and magnetic steel, and a plastic body which integrates the movable spring part, the armature and the magnetic steel into a whole through an injection molding mode, the magnetic steel and the movable spring part are respectively positioned below the armature, the movable spring part comprises two movable springs and a conductive sheet which are arranged in parallel, the conductive sheet and the two movable springs are integrally formed, so that the two movable springs are connected in series, partial pressure is realized inside the relay through the two groups of contacts, the high-voltage breaking capacity of the contacts is improved under the condition that the volume is unchanged, and when the contacts are broken, the circuit is broken through the two groups of contacts, thereby improving the pressure resistance between the contacts. However, in order to make enough magnet steel placing space below the armature, the conducting plate is placed on the normally closed side of the armature component of the moving spring, which results in longer conducting path and larger contact resistance of the whole moving spring.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides a high-voltage-resistant electromagnetic relay, which improves the structure of a movable spring part and achieves the aim of reducing contact resistance.

The technical scheme adopted for solving the technical problems is as follows: the electromagnetic relay comprises a base part and a movable spring armature part, wherein the base part comprises a base, a coil, an iron core and at least one static spring part, wherein the coil, the iron core and the at least one static spring part are arranged on the base, and the pole faces at the two ends of the iron core are respectively exposed upwards; the movable spring armature component comprises at least one movable spring part, an armature and magnetic steel, and a plastic body which integrates the movable spring part, the armature and the magnetic steel into a whole piece in an injection molding mode, wherein the magnetic steel is positioned below the armature, a welding sheet structure is arranged at the middle part of the movable spring armature component, the movable spring armature component is arranged at the top of the base part through the welding sheet structure, and two ends of the armature exposed out of the plastic body are correspondingly matched with pole faces at two ends of the iron core respectively; the static spring part is matched with the movable spring part, the movable spring part comprises two movable reeds and a conducting strip, and the two movable reeds are respectively and integrally formed or electrically connected with the conducting strip; the movable spring part is positioned above the armature, the two movable spring plates are respectively positioned above two sides of the armature in the width direction, the conducting strip stretches across the armature, and the conducting strip and the two movable spring plates are positioned on the same side of the welding strip structure.

Further, the conductive sheet and the tab structure are independent of each other, and a gap is provided between the conductive sheet and the tab structure, and the gap is filled with a part of the plastic body.

Further, a groove is formed in a portion of the armature below the conductive sheet, openings are formed in two ends of the groove in the width direction of the armature, and a gap formed between the groove and the conductive sheet is filled with a portion of plastic of the plastic body.

Further, the static spring part comprises two static spring pieces, the two static spring pieces are respectively positioned below the two movable spring pieces, and static contacts arranged on the two static spring pieces are respectively matched with movable contacts arranged on the two movable spring pieces in a one-to-one correspondence manner; the setting heights of the two static reeds are respectively higher than the height of the pole face of the iron core; the base is provided with a retaining wall between the static reed and the iron core.

Further, the number of the movable spring part and the static spring part is one respectively, and the normally open type contact assembly or the normally closed type contact assembly is formed; the armature has a first end proximate the moving spring portion and a second end distal the moving spring portion; the area of the contact surface between the first end of the armature and one end of the iron core is smaller than the area of the contact surface between the second end of the armature and the other end of the iron core.

Further, the bottom of the second end of the armature is locally flattened.

Further, two ends of the bottom of the second end of the armature in the width direction are flattened respectively, so that only the middle area of the bottom of the second end of the armature is contacted with the other end of the iron core.

Further, the second end of the armature is made short, so that the dimension of the contact surface between the first end of the armature and one end of the iron core in the preset direction is larger than the dimension of the contact surface between the second end of the armature in the preset direction, and the preset direction is the length direction of the armature.

Further, the soldering lug structure is positioned above the armature, and comprises two soldering lugs and a connecting piece, wherein the two soldering lugs are positioned above two sides of the middle part of the armature in the width direction, and the connecting piece spans the armature and is integrally formed with the two soldering lugs; the top of base is equipped with two and welds the platform, two soldering lug respectively with two welding the platform one-to-one welded fastening.

Further, the conductive sheet is completely wrapped in the plastic body, and the base integrates the coil, the iron core, the static spring part and the coil leading-out end into a whole through injection molding.

Compared with the prior art, the utility model has the following beneficial effects:

1. because the movable spring part is arranged above the armature, the conductive sheet of the movable spring part does not need to avoid the magnetic steel below the armature, so the conductive sheet can be arranged as close to two movable spring plates as possible, and particularly, the conductive sheet and the two movable spring plates are positioned on the same side of the welding sheet structure, so that the conductive path of the whole movable spring part is greatly shortened, and the aim of greatly reducing the contact resistance is fulfilled.

2. The conducting strip with the lug structure mutually independent for after the lug structure is fixed, do not have the influence to the action of movable reed, and the electric current on the movable reed can not conduct to the lug structure, can not influence the reaction structure of relay. In particular, a gap is formed between the conductive sheet and the tab structure, and the gap is filled with a part of the plastic body, so that insulation performance between the movable spring part and the tab structure can be ensured.

3. The part of the armature below the conducting strip is provided with a groove, so that the distance between the armature and the conducting strip is larger, and the insulating effect is better. In particular, the gap formed between the recess and the conductive piece is filled with a part of the plastic body, so that the insulation performance between the moving spring part and the armature can be ensured.

4. The setting height of the two static spring plates is respectively higher than the height of the pole face of the iron core, so that the insulation performance between the static spring plates and the iron core can be ensured. The base is provided with a retaining wall between the static reed and the iron core, and the insulating property between the static reed and the iron core can be further improved.

5. The area of the contact surface between the first end of the armature and one end of the iron core is smaller than that between the second end of the armature and the other end of the iron core, so that the magnetic steel force of the armature, which is far away from the second end of the movable spring part, can be reduced, and the armature is convenient to be close to the first end of the movable spring part.

6. The welding sheet structure comprises the two welding sheets and a connecting sheet, wherein the connecting sheet and the two welding sheets are integrally formed, so that the connecting sheet and the two welding sheets are formed by processing the same sheet, the flatness and the height consistency of the two welding sheets can be ensured, and the installation accuracy of the moving spring armature component is ensured.

The utility model is described in further detail below with reference to the drawings and examples; the electromagnetic relay of the present utility model is not limited to the embodiment.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present utility model (without a housing);

fig. 2 is a schematic perspective view of a moving spring armature assembly according to an embodiment of the utility model;

FIG. 3 is a schematic diagram showing the positional relationship between a movable spring portion and a lug structure according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram showing a structure of a moving spring portion and a static spring portion in a disconnected state according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing a structure of a moving spring portion and a static spring portion in a contact state according to an embodiment of the present utility model;

FIG. 6 is a partial cross-sectional view of a moving spring armature assembly of the utility model according to one embodiment;

fig. 7 is a top view (without plastic body) of a moving spring armature assembly of the utility model according to an embodiment;

fig. 8 is a schematic perspective view of an armature (including magnetic steel) according to an embodiment of the utility model;

fig. 9 is a front view (without plastic body) of a moving spring armature assembly of the utility model according to an embodiment;

fig. 10 is a bottom view of an armature of the utility model according to an embodiment;

fig. 11 is a right side view of an armature of the utility model according to an embodiment;

FIG. 12 is a schematic view of a base portion of the present utility model;

fig. 13 is a front view (including magnetic steel) of an armature and an iron core in a mated state according to the second embodiment of the present utility model;

the welding device comprises a base, 11, a welding table, 12, a retaining wall, 2, an iron core, 3, a static spring piece, 31, a static contact, 32, a static spring lead-out terminal, 4, an armature, 41, a groove, 42, a middle area, 5, a movable spring part, 51, a movable spring piece, 52, a conductive sheet, 53, a movable contact, 6, a plastic body, 7, a soldering lug structure, 71, a soldering lug, 72, a connecting sheet, 8, magnetic steel, 9 and a coil lead-out terminal.

Detailed Description

Example 1

Referring to fig. 1-12, the electromagnetic relay of the present utility model comprises a base portion and a moving spring armature component, wherein the base portion comprises a base 1, a coil, an iron core 2 and at least one static spring portion, which are arranged on the base 1, and specifically, the base 1 integrates the coil, the iron core 2, the static spring portion and a coil leading-out end into a whole through injection molding, and pole faces at two ends of the iron core 2 are respectively exposed upwards and are positioned at two ends of the base 1. The movable spring armature component comprises at least one movable spring part 5, an armature 4 and magnetic steel 8, and a plastic body 6 which integrates the movable spring part 5, the armature 4 and the magnetic steel 8 into a whole through an injection molding mode, wherein the magnetic steel 8 is positioned below the armature 4, a soldering lug structure 7 is arranged in the middle of the movable spring armature component, the movable spring armature component is arranged at the top of the base part through the soldering lug structure 7, and two ends of the armature 4 exposed out of the plastic body 6 are correspondingly matched with pole faces at two ends of the iron core 2 respectively. The static spring portion is in one-to-one correspondence with the movable spring portion 5, and the movable spring portion 5 includes two movable springs 51 arranged in parallel and a conductive sheet 52 located between the two movable springs 51, where the conductive sheet 52 and the two movable springs 51 are integrally formed, but not limited to this, and in other embodiments, the conductive sheet and the two movable springs are electrically connected by welding or riveting. The movable spring part 5 is located above the armature 4, the two movable springs 51 are respectively located above two sides of the armature 4 in the width direction, the conductive sheet 52 spans across the armature 4, the conductive sheet 52 and the two movable springs 51 are located on the same side of the soldering lug structure 7, specifically, one end bottoms of the two movable springs 51, which are far away from the soldering lug structure 7, are respectively provided with a movable contact 53, and the other ends of the two movable springs 51, which are close to the soldering lug structure 7, are respectively integrally formed with the conductive sheet 52.

In this embodiment, as shown in fig. 3, the conductive sheet 52 and the soldering lug structure 7 are independent from each other, so that after the soldering lug structure 7 is fixed, the action of the movable reed 51 is not affected, and the current on the movable reed 51 is not conducted to the soldering lug structure 7, so that the reaction structure of the relay is not affected. The conductive sheet 52 is completely encased in the plastic body 6 and there is a gap between the conductive sheet 52 and the tab structure 7, which gap is filled with a portion of the plastic body 6. In this way, the insulation performance between the moving spring part 5 and the lug structure 7 can be ensured.

In this embodiment, as shown in fig. 3, 6 and 7, the soldering lug structure 7 is located above the armature 4, and the soldering lug structure 7 includes two soldering lugs 71 and a connecting piece 72, the two soldering lugs 71 are located above two sides of the middle part of the armature 4 in the width direction, and the connecting piece 72 spans the armature 4 and is integrally formed with the two soldering lugs 71. In this way, the connecting piece 72 and the two welding pieces 71 are formed by the same sheet material, so that the flatness and the height of the two welding pieces 71 can be ensured to be consistent, and the accuracy of the installation of the moving spring armature component can be ensured. The two lugs 71 are of an integral structure, so that the rigidity of the lugs can be improved to a certain extent. As shown in fig. 10, two welding tables 11 are disposed at the top of the base 1, and the two welding tabs 71 are welded and fixed with the two welding tables 11 one by one. The welding piece structure 7 is arranged above the armature 4, so that the intrusion of the magnetic steel placing space below the armature 4 can be avoided. The middle part of the connecting piece 72 adopts a hollowed-out design, so that the weight can be reduced, the material can be saved, and the stress of the connecting piece 72 is released, so that the connecting piece 72 is not easy to deform due to the influence of thermal expansion and cold contraction.

In this embodiment, as shown in fig. 8 and 9, the portion of the armature 4 below the conductive sheet 52 is provided with the groove 41, so that the distance between the armature 4 and the conductive sheet 52 is larger, and the insulation effect is better. The gap formed between the recess 41 and the conductive piece 52 is filled with a part of the plastic body 6, so that insulation performance between the moving spring part 5 and the armature 4 can be ensured. The two ends of the groove 41 in the width direction of the armature 4 are respectively provided with openings, that is, the two ends of the groove 41 in the width direction of the armature 4 are respectively led to the outside to form an open type. In this way, a greater distance from the conductive plate 52 can be ensured everywhere at the location of the recess 41.

In this embodiment, the static spring portion includes two static springs 3, the two static springs 3 are respectively under the two movable springs 51, and the static contacts 31 disposed on the two static springs 3 are respectively in one-to-one correspondence with the movable contacts 53 disposed on the two movable springs 51. The setting height of the two static spring plates 3 is respectively higher than the height of the pole face of the iron core 2, so that the insulation performance between the static spring plates 3 and the iron core 2 can be ensured. As shown in fig. 10, the base 1 is provided with a retaining wall 12 between the static reed 3 and the iron core 2, so that the insulation performance between the static reed 3 and the iron core 2 can be further improved.

In this embodiment, the number of the moving spring part 5 and the static spring part is one, and the normally open type contact assembly is formed, so the utility model forms a normally open type relay, the base part of the normally open type relay has only four lead-out terminals (including two coil lead-out terminals 9 and two static spring lead-out terminals 32), the four lead-out terminals have larger isolation, and the coil and the contact have larger creepage distance and air gap.

In this embodiment, the armature 4 has a first end close to the moving spring portion 5 and a second end distant from the moving spring portion 5, both ends of the armature 4 in the length direction constituting the first end and the second end, respectively. The area of the contact surface between the first end of the armature 4 and one end of the core 2 is smaller than the area of the contact surface between the second end of the armature 4 and the other end of the core 2. Because the utility model is a normally open relay, the first end of the armature 4, which is close to the moving spring part 5, is the normally open end, and the second end of the armature 4, which is far away from the moving spring part 5, is the normally closed end. Therefore, the magnetic steel force of the normally-closed side of the armature can be reduced, the force matching problem of the normally-open relay is solved, and the attraction capacity of the normally-open side of the armature is improved, so that the attraction of the normally-open side of the armature component of the movable spring is facilitated. This is because if the areas of the contact surfaces between the armature ends and the pole faces of the core are identical, the magnetic steel forces at the armature ends are identical, but the normally closed side of the moving spring armature member has no contact, only the normally open side has a contact, the normally open side has more contact pressure, the forces at the armature sides are unbalanced, and the attraction at the normally open side of the relay is difficult. In other embodiments, the moving spring portion 5 and the stationary spring portion constitute a normally closed contact assembly.

In this embodiment, the bottom of the second end of the armature 4, which is far away from the moving spring portion 5, is locally flattened, so that the area of the contact surface between the first end of the armature 4 and one end of the iron core 2 is smaller than the area of the contact surface between the second end of the armature 4 and the other end of the iron core 2. Specifically, as shown in fig. 11 and 12, the two ends of the bottom of the second end of the armature 4 in the width direction are flattened, so that the second end of the armature 4 away from the moving spring portion 5 has a structure in which the middle area 42 is thicker and thinner, and the thickness of the second end of the armature 4 is gradually reduced from the middle to the two ends in the width direction. The middle area 42 is elongated and extends along the length direction of the armature 4, the periphery of the middle area 42 is square, and the bottom surfaces of the two ends of the second end of the armature 4 are respectively inclined surfaces 43 so as to gradually transition to the middle area 42. Therefore, only the middle area 42 at the bottom of the second end of the armature 4 contacts with the other end of the core 2, so that the magnetic leakage at two ends of the second end of the armature 4 in the width direction is large, and the magnetic field generated by the magnetic steel 8 is concentrated in the middle area 42, so that the magnetic steel force is reduced. In this way, the armature 4 is also forced to be balanced in the width direction away from the second end of the moving spring portion 5, and is not biased to one side in the width direction.

According to the electromagnetic relay with high withstand voltage, the two movable reeds 51 are integrally formed through the conducting strip 52, so that a series connection mode of two sets of contacts is realized, the disconnection state of the two sets of contacts is shown in fig. 4, the closing state of the two sets of contacts is shown in fig. 5, and in fig. 5, arrows indicate the current direction. The relay is internally divided by two groups of contacts, so that the high-voltage breaking capacity of the contacts is improved under the condition of keeping the volume unchanged, and when the contacts are disconnected, two groups of contacts are simultaneously disconnected on a circuit, so that the voltage withstand capacity between the disconnected contacts is greatly improved.

According to the electromagnetic relay with high withstand voltage, the movable spring part 5 is arranged above the armature 4, so that the conducting sheet 52 of the movable spring part 5 does not need to avoid the magnetic steel 8 below the armature 4, and therefore the conducting sheet 52 can be arranged as close to the two movable springs 51 as possible. In particular, the utility model locates the conductive sheet 52 and the two movable reeds 51 on the same side of the soldering lug structure 7, so that the conductive path of the whole movable reed part 5 is greatly shortened, thereby achieving the purpose of greatly reducing contact resistance.

Example two

Referring to fig. 13, the electromagnetic relay with high withstand voltage according to the present utility model is different from the first embodiment in that: the second end of the armature 4, which is far away from the moving spring part 5, is made short, so that the dimension of the contact surface of the first end, which is close to the moving spring part 5, of the armature 4 with one end of the iron core 2 in a preset direction is larger than the dimension of the contact surface of the second end, which is far away from the moving spring part 5, of the armature 4 with the other end of the iron core 2 in the preset direction, and the preset direction is the length direction of the armature 4. Therefore, a certain horizontal distance L is provided between the second end of the armature 4, which is far from the moving spring portion 5, and the outer edge of the other end of the core 2, and the outer edge of the first end of the armature 4, which is near to the moving spring portion 5, is aligned with the outer edge of the one end of the core 2, or the outer edge of the first end of the armature 4, which is near to the moving spring portion 5, is slightly protruded from the outer edge of the one end of the core 2. In this way, the area of the contact surface of the first end of the armature 4, which is close to the moving spring part 5, with one end of the iron core 2 is smaller than the area of the contact surface of the second end of the armature 4, which is far away from the moving spring part 5, with the other end of the iron core 2, so that the magnetic steel force of the second end (normally closed side) of the armature 4, which is far away from the moving spring part 5, is reduced, and the normally open side of the moving spring armature component is facilitated.

The electromagnetic relay with high withstand voltage is not related to the electromagnetic relay which is the same as or can be realized by adopting the prior art.

The above embodiment is only used for further illustrating a high withstand voltage electromagnetic relay of the present utility model, but the present utility model is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the present utility model falls within the protection scope of the technical solution of the present utility model.

Claims (10)

1. The electromagnetic relay comprises a base part and a movable spring armature part, wherein the base part comprises a base, a coil, an iron core and at least one static spring part, wherein the coil, the iron core and the at least one static spring part are arranged on the base, and the pole faces at the two ends of the iron core are respectively exposed upwards; the movable spring armature component comprises at least one movable spring part, an armature and magnetic steel, and a plastic body which integrates the movable spring part, the armature and the magnetic steel into a whole piece in an injection molding mode, wherein the magnetic steel is positioned below the armature, a welding sheet structure is arranged at the middle part of the movable spring armature component, the movable spring armature component is arranged at the top of the base part through the welding sheet structure, and two ends of the armature exposed out of the plastic body are correspondingly matched with pole faces at two ends of the iron core respectively; the static spring part is matched with the movable spring part, the movable spring part comprises two movable reeds and a conducting strip, and the two movable reeds are respectively and integrally formed or electrically connected with the conducting strip; the method is characterized in that: the movable spring part is positioned above the armature, the two movable spring plates are respectively positioned above two sides of the armature in the width direction, the conducting strip stretches across the armature, and the conducting strip and the two movable spring plates are positioned on the same side of the welding strip structure.

2. The high withstand voltage electromagnetic relay according to claim 1, wherein: the conductive sheet and the soldering lug structure are independent from each other, and a gap is formed between the conductive sheet and the soldering lug structure, and the gap is filled by a part of plastics of the plastic body.

3. The high withstand voltage electromagnetic relay according to claim 1, wherein: the armature is provided with a groove at the position below the conducting strip, the two ends of the groove in the width direction of the armature are respectively provided with an opening, and a gap formed between the groove and the conducting strip is filled with a part of plastic of the plastic body.

4. The high withstand voltage electromagnetic relay according to claim 1, wherein: the static spring part comprises two static spring pieces, the two static spring pieces are respectively positioned below the two movable spring pieces, and static contacts arranged on the two static spring pieces are respectively matched with movable contacts arranged on the two movable spring pieces in a one-to-one correspondence manner; the setting heights of the two static reeds are respectively higher than the height of the pole face of the iron core; the base is provided with a retaining wall between the static reed and the iron core.

5. The high withstand voltage electromagnetic relay according to claim 1, wherein: the number of the movable spring part and the static spring part is one respectively, and the movable spring part and the static spring part form a normally open type contact assembly or a normally closed type contact assembly; the armature has a first end proximate the moving spring portion and a second end distal the moving spring portion; the area of the contact surface between the first end of the armature and one end of the iron core is smaller than the area of the contact surface between the second end of the armature and the other end of the iron core.

6. The high withstand voltage electromagnetic relay according to claim 5, wherein: the bottom of the second end of the armature is locally flattened.

7. The high withstand voltage electromagnetic relay according to claim 6, wherein: and the two ends of the bottom of the second end of the armature in the width direction are respectively flattened, so that only the middle area of the bottom of the second end of the armature is contacted with the other end of the iron core.

8. The high withstand voltage electromagnetic relay according to claim 5, wherein: the second end of the armature is made short, so that the dimension of the contact surface between the first end of the armature and one end of the iron core in the preset direction is larger than the dimension of the contact surface between the second end of the armature and the other end of the iron core in the preset direction, and the preset direction is the length direction of the armature.

9. The high withstand voltage electromagnetic relay according to claim 1, wherein: the welding piece structure is positioned above the armature, and comprises two welding pieces and a connecting piece, wherein the two welding pieces are positioned above two sides of the middle part of the armature in the width direction, and the connecting piece spans the armature and is integrally formed with the two welding pieces; the top of base is equipped with two and welds the platform, two soldering lug respectively with two welding the platform one-to-one welded fastening.

10. The high withstand voltage electromagnetic relay according to claim 1, wherein: the conductive sheet is completely wrapped in the plastic body, and the base integrates the coil, the iron core, the static spring part and the coil leading-out end into a whole through injection molding.

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