CN219591326U - Armature component and electromagnetic relay with high creepage performance - Google Patents

Abstract

The utility model discloses an armature component and an electromagnetic relay with high creepage performance, wherein the armature component comprises an armature, a pushing block and a bracket, the pushing block is made of thermosetting materials, the pushing block is fixed with a beam of the armature, the length dimension of the pushing block is not smaller than the length dimension of the beam, the width dimension of the pushing block is not smaller than the width dimension of the beam, and the pushing block completely covers the beam; the support is made of thermoplastic materials, the support is combined with the armature and the pushing block which are fixed mutually in an injection molding mode, and the armature, the pushing block and the support form an integral piece through injection molding. The pushing block of the armature component can completely cover the beam of the armature, so that the beam of the armature is prevented from facing the gap between the pushing block and the bracket, a sufficient creepage distance is reserved between the gap between the pushing block and the bracket, poor voltage withstand electric breakdown is avoided, and the electromagnetic relay has high creepage performance.

Description

Armature component and electromagnetic relay with high creepage performance

Technical Field

The utility model relates to the field of relays, in particular to an armature component and an electromagnetic relay with high creepage performance.

Background

With the economic development, the living standard of people is gradually improved, home appliances have been popularized to every home, and electromagnetic relays as automatic switches are applied to every home appliance control system. The patent CN217214598U filed by the present inventor discloses an armature component for pushing a movable spring, the armature component comprises an armature 100, a pushing 200 and a bracket 300, the armature 100 is formed by punching, the pushing block 200 is formed by injection molding of a thermosetting material, after the pushing block 200 is fixed with the armature 100, the bracket 300 is formed by injection molding of a thermoplastic material, and the bracket 300, the armature 100 and the pushing block 200 are connected into a whole. During use, existing armature components find the following two disadvantages:

1. because the pushing block 200 and the support 300 are made of two different materials, namely thermosetting and thermoplastic, and the shrinkage rates of the different materials are different, a gap 400 exists between the pushing block 200 and the support 300 after injection molding, as shown in fig. 1, the pushing block 200 cannot completely cover the cross beam of the armature 100, so that the cross beam of the armature 100 is opposite to the gap 400 formed between the pushing block 200 and the support 300 due to shrinkage of the materials, the creepage distance between the pushing block 200 and the gap 400 of the support 300 is insufficient, and then a movable spring above the armature 100 and the pushing block 200 is easily electrically broken down along the gap 400 (using voltage 4950 volts), and a problem of poor withstand voltage is generated (as shown in fig. 1).

2. The boss on the pushing block is thicker than other parts of the pushing block, in the injection molding process, in order to fill the cavity of the injection molding boss with material, the boss is inverted in the mold, the material flow direction at the boss flows from one side surface (reference numeral 201 in fig. 2) of the boss to the other opposite side surface, however, the slopes of the two side surfaces of the boss in the material flow direction in the prior art are larger, so that the transition with the top surface 202 of the boss is not smooth enough, the transition area between the two side surfaces and the top surface can influence the air discharge speed in the injection molding process, air accumulation is caused, and the accumulated air is heated up under the pressurized environment to cause the bad burning of injection molding.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides an armature component and an electromagnetic relay with high creepage performance comprising the armature component, so as to overcome the defects of the prior art.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the utility model provides an armature component, which comprises an armature, a pushing block and a bracket, wherein:

the armature is provided with a beam;

the pushing block is made of thermosetting materials, the pushing block is fixed with the cross beam of the armature, the length dimension of the pushing block is not smaller than the length dimension of the cross beam, the width dimension of the pushing block is not smaller than the width dimension of the cross beam, and the pushing block completely covers one side, contacted with the pushing block, of the cross beam;

the support is made of thermoplastic materials, the support is combined with the armature and the pushing block which are fixed mutually in an injection molding mode, and the armature, the pushing block and the support form an integral piece through injection molding.

Further, the pushing block comprises a fixing seat and a boss, the fixing seat is fixed with the cross beam, the fixing seat is configured to be a nonlinear shortest creepage path from one side of the fixing seat, which is close to the cross beam, to the other side, which is far away from the cross beam, the fixing seat and the cross beam are wrapped inside the bracket in an injection molding mode, and the boss protrudes outside the bracket.

Further, one side of the fixing seat, which is contacted with the cross beam, is provided with a first retaining wall which extends to the side edge of the cross beam to increase the creepage distance.

Furthermore, the periphery of the fixing seat is provided with a step structure along the creepage direction.

Further, the step structure is provided with a first step and a second step at least in sequence from the direction close to the cross beam to the direction far away from the cross beam, and a second retaining wall for increasing the creepage path is arranged on one side of the first step far away from the cross beam.

Further, the armature includes first armature section and the second armature section that are connected, and first armature section and second armature section connect into L shape, and the one end that keeps away from the second armature section of first armature section is equipped with the crossbeam, and one side that is close to the second armature section of crossbeam is equipped with the groove, and the both sides of groove are equipped with two linking arm respectively, and the crossbeam is connected to two linking arms.

Further, the crossbeam is rectangle, and two linking arms are connected on a long limit of crossbeam, the fixing base be with the rectangle of crossbeam looks adaptation, one side that contacts with the crossbeam of fixing base is provided with two first barricades that are used for sheltering from two long limits of crossbeam respectively, is equipped with step structure around the fixing base, and step structure is equipped with one-level step and second grade step at least in proper order from being close to the crossbeam to the direction of keeping away from the crossbeam, and one side that keeps away from the crossbeam of two long limits of at least one-level step is provided with two second barricades that increase creepage path.

Further, the boss integrated into one piece in the fixing base back to the crossbeam one side, the cross-section of boss is square, the boss has four sides, and the slope of at least two of them opposite sides is < 50 and with the top surface smooth transition of boss.

Further, the slopes of the two side surfaces of the boss in the length direction are smaller than 50 degrees.

The utility model also provides an electromagnetic relay with high creepage performance, which comprises the armature component.

Compared with the prior art, the armature component provided by the utility model has the following advantages:

1. the utility model improves the size of the pushing block, the length size of the pushing block is not smaller than the length size of the cross beam of the armature, the width size of the pushing block is not smaller than the width size of the cross beam of the armature, the pushing block is ensured to completely cover the cross beam of the armature, the cross beam of the armature is prevented from facing the gap between the pushing block and the bracket, and enough creepage distance exists between the gap between the pushing block and the bracket, so that poor withstand voltage electric breakdown is avoided.

2. The creepage path is prolonged by arranging the first retaining wall, the second retaining wall and the step structure, so that the shortest creepage path from one side of the fixed seat, which is close to the cross beam, to the other side, which is far away from the cross beam, is nonlinear, and the creepage distance is ensured.

3. The inclination of at least two opposite side surfaces of the boss of the pushing block is designed to be less than 50 degrees and is in gentle transition with the top surface of the boss, so that air is easy to discharge in a transition area between the side surface and the top surface in the injection molding process, accumulation is not easy to occur, and the problems of scorching and material filling dissatisfaction in the injection molding process of the thermosetting plastic pushing block are avoided.

Drawings

Fig. 1 is a cross-sectional view of a prior art armature component;

FIG. 2 is a schematic perspective view of a pusher block of the background art;

fig. 3 is a schematic perspective view of an armature component of the present utility model;

fig. 4 is a cross-sectional view of an armature component of the utility model;

fig. 5 is a schematic perspective view of an armature of the present utility model;

fig. 6 is a perspective view of a pusher block provided with a step structure of the present utility model;

FIG. 7 is a front view of the pusher block of FIG. 6;

fig. 8 is a perspective view of a pusher block provided with a step structure and a first retaining wall;

fig. 9 is a schematic perspective view of a pusher block provided with a step structure and a second retaining wall;

fig. 10 is a schematic view showing a combined state of the bracket and the armature of the present utility model;

fig. 11 is a sectional view of the electromagnetic relay of the present utility model;

fig. 12 is an exploded schematic view of the electromagnetic relay of the present utility model;

FIG. 13 is an exploded schematic view of a magnetic circuit portion of the present utility model;

fig. 14 is a schematic perspective view of a magnetic circuit portion of the present utility model;

fig. 15 is a perspective view of a moving spring part of the present utility model;

FIG. 16 is a schematic perspective view of a static spring portion of the present utility model;

fig. 17 is a front view of the electromagnetic relay of the present utility model.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 3 to 9, the present embodiment discloses an armature component including an armature 1, a push block 2, and a bracket 3, and the push block 2 is used to drive a movable spring of an electromagnetic relay.

The armature 1 is provided with a cross beam 11, the pushing block 2 is made of thermosetting materials, the pushing block 2 is fixed with the cross beam 11 of the armature 1, the length dimension of the pushing block 2 is not smaller than the length dimension of the cross beam 11, and the width dimension of the pushing block 2 is not smaller than the width dimension of the cross beam 11, so that the pushing block 2 completely covers one side of the cross beam 11, which is contacted with the pushing block 2. The support 3 is made of thermoplastic materials, the support 3 is combined with the armature 1 and the pushing block 2 which are fixed together in an injection molding mode, and the armature 1, the pushing block 2 and the support 3 are formed into a whole through injection molding.

The pushing block 2 is made of a thermosetting material, and the electric arc high temperature resistance of the armature component is improved by utilizing the characteristics of high chemical resistance, heat resistance and difficult deformation of the thermosetting material, so that the pushing block 2 is prevented from being melted under the action of electric arc heat to influence the normal operation of the electromagnetic relay. The bracket 3 is made of thermoplastic materials, so that the cost is reduced.

Because the pushing block 2 and the support 3 are made of two different thermosetting and thermoplastic materials respectively, gaps exist between the pushing block 2 and the support 3 after injection molding, and in the utility model, the pushing block 2 completely covers the cross beam 11 of the armature 1 (the length dimension of the pushing block 2 is not smaller than the length dimension of the cross beam 11, the width dimension of the pushing block 2 is not smaller than the width dimension of the cross beam 11), the situation that the cross beam 11 of the armature 1 is opposite to the gaps between the pushing block 2 and the support 3 is avoided, the bigger the gaps are at the side edge of the cross beam 11, the creepage distance between the pushing block 2 and the upper surface of the pushing block 2 along the cross beam 11 around the bottom of the pushing block 2 is longer, and the enough creepage distance between the thermosetting pushing block 2 and the thermoplastic support 3 is ensured (the creepage path is shown in figure 4).

The armature 1 comprises a first armature section and a second armature section which are connected, the first armature section and the second armature section are connected into an L shape, one end of the first armature section, which is far away from the second armature section, is provided with a cross beam 11, one side of the cross beam 11, which is close to the second armature section, is provided with a groove 12, two sides of the groove 12 are respectively provided with two connecting arms, and the two connecting arms are connected with the cross beam 11. The cross beam 11 is rectangular (in other embodiments, the cross beam 11 is not limited to rectangular, for example, is arc-shaped), and one long side of the cross beam 11 is connected to two connecting arms. The slotting 12 on the armature 1 not only reduces the weight of the armature 1, but also reduces the area of the cross beam 11, so that the cross beam 11 is easy to be covered by the pushing block 2, and simultaneously, the volumes of the pushing block 2 and the bracket 3 can be further reduced, so that the cost is reduced.

The pushing block 2 comprises a fixed seat 21 and a boss 22, the fixed seat 21 is fixed with the beam 11, the fixed seat 21 is rectangular matched with the beam 11, the fixed seat 21 is aligned with the beam 11 in equal width or the width of the fixed seat 21 exceeds the width of the beam 11, the fixed seat 21 is aligned with the beam 11 in equal length or the length of the fixed seat 21 exceeds the length of the beam 11, so that the fixed seat 21 completely covers the beam 11, and gaps between the beam 11 and the bracket 3 due to different shrinkage of injection molding materials are avoided, thereby increasing the creepage distance.

To further increase the creepage distance, the fixing base 21 is configured such that the shortest creepage path from one side of the fixing base 21 close to the cross beam 11 to the other side far from the cross beam 11 is a non-straight line. To achieve this, various manners are adopted, for example, a first retaining wall 25 extending to the side of the beam 11 to increase the creepage distance is provided on the side of the fixing base 21 contacting the beam 11 (in fig. 8, two first retaining walls 25 for shielding two long sides of the beam 11 are provided on the side of the fixing base 21 contacting the beam 11, a first retaining wall 25 may be provided on each short side of the beam 11 to surround the beam 11), and for example, a step structure is provided on the periphery of the fixing base 21 along the creepage direction (as in fig. 6), as a further improvement, at least one step and two steps are provided in sequence on the step structure from the direction close to the beam 11 to the direction away from the beam 11, and a second retaining wall 26 for increasing the creepage path is provided on the side of the one step away from the beam 11 (in fig. 9, two second retaining walls 26 for increasing the creepage path are provided on the side of the two long sides of the one step away from the beam 11, and a second retaining wall may be provided on the side of each short side of the one step away from the beam 11). It should be understood by those skilled in the art that the periphery of the fixing base 21 may be provided with a concave-convex structure in addition to the step structure, which also has the effect of increasing the creepage distance.

The bracket 3 wraps the fixing seat 21 and the cross beam 11 inside in an injection molding mode, the boss 22 protrudes outside the bracket 3, and the boss 22 is used for driving the movable reed 61 of the electromagnetic relay to act. The thermoplastic bracket 3 is adopted to wrap the fixing seat 21 and the cross beam 11, so that the connection stability and accuracy of the armature 1 and the pushing block 2 are ensured, the stability of the whole armature component is improved, the bracket 3 can be utilized to play a certain role in protecting the pushing block 2, and the risk that the pushing block 2 generates plastic scraps is reduced (because the thermosetting material easily generates scraps relative to the thermoplastic material).

In a specific structure, the pushing block 2 is formed by single die opening injection molding, the boss 22 is integrally formed on one side of the fixing seat 21, which is opposite to the beam, the cross section of the boss 22 is square, and the boss 22 is provided with four side surfaces. Based on the tendency of scorching to occur during injection molding of the pusher block 2, the slope of at least two opposing sides of the boss 22 is less than 50 ° and smoothly transitions with the top surface of the boss 22. The material flows to the other opposite side along one side with the gradient less than 50 degrees when the boss 22 is injection molded, the material flows can keep smooth and gentle in the transition area between the two side surfaces and the top surface of the boss 22, the material injection speed can be effectively controlled, air is not easy to accumulate in the transition area between the top surface of the boss and the two side surfaces in the material flow direction, the air in the transition area is discharged, and the problems of burning and material injection dissatisfaction of the thermosetting plastic pushing block 2 in the injection molding process are avoided.

Preferably, the two sides of the boss 22 in the length direction are provided with slope surfaces 24 with a slope of less than 50 ° (see fig. 6, the slope surfaces 24 are positioned at the short sides of the boss 22), and the material flows along the length direction of the boss 22 during injection molding, and compared with the material flows along the width direction of the boss 22, the material flows along the length direction of the boss 22 can obtain a longer buffer path, so that the transition area between the slope surfaces 24 and the top surface of the boss 22 is more gentle, the whole cavity is filled, and injection molding defects of the boss 22 are avoided.

In this embodiment, the beam 11 and the fixing base 21 are matched with a positioning structure, the positioning structure includes a positioning column 23 and a positioning hole 13 which are mutually embedded, one of the positioning column 23 and the positioning hole 13 is arranged on the beam 11, and the other of the positioning column 23 and the positioning hole 13 is arranged on the fixing base 21. Specifically, as shown in fig. 5, the positioning hole 13 is disposed on one side of the armature 1, and the positioning hole 13 is a flat hole (specifically, but not limited to, a square hole) to play a role of stopping rotation; referring to fig. 7, a positioning post 23 is disposed at the bottom of the fixing seat 21, and the cross-sectional shape of the positioning post 23 is adapted to the shape of the positioning hole 13. The setting of location structure can play the pre-positioning effect to armature 1 and promote piece 2 for when adopting thermoplastic material and armature 1, promote piece 2 to make support 3 through the mode of moulding plastics, can ensure that armature 1 and promote the relative position of piece 2 more accurate. In other embodiments, the armature 1 and the push block 2 may be fixedly connected by riveting, screw locking, insert injection molding, or the like.

In this embodiment, the fixing seat 21 is square, the step structure is arranged around the fixing seat 21, the support 3 is used for encircling the step structure of the fixing seat 21 through injection molding, and the support 3 is used for forming a limit groove 32 capable of clamping the step structure of the fixing seat 21 through injection molding. The support 3 encircles around fixing base 21, not only can reduce the exposure around the impeller block 2 to reduce the plastic bits that the impeller block 2 rubs out, can also further improve the steadiness of impeller block 2. The periphery of the fixed seat 21 is provided with a step structure, so that the connection between the pushing block and the bracket is more compact and firm.

As shown in fig. 10, the bracket 3 is provided with a stopper 31 for engaging with the base 4 of the electromagnetic relay, and the stopper 31 is a hook. The limiting part 31 is integrally formed on the bracket 3, so that the forming is easy, and plastic scraps generated by the limiting part 31 in the working process can be reduced.

In this embodiment, it is preferable that at least a portion of the surface of the push block 2 for contact with the moving spring portion 6 is covered with a lubricating layer. The lubrication layer can provide lubrication, reduce the contact friction of the push block 2 with the movable spring portion 6, and reduce the generation of plastic chips by the push block 2.

The utility model also provides an electromagnetic relay with high creepage performance, which comprises a base 4, a shell 8, a magnetic circuit part 5, a movable spring part 6 and a static spring part 7, wherein the magnetic circuit part 5, the movable spring part 6 and the static spring part 7 are arranged on the base 4, and the movable spring part 6 and the static spring part 7 are mutually matched; the armature component is matched with the magnetic circuit part 5, and the pushing block 2 of the armature component is propped against the movable spring 61 of the movable spring part 6, or the pushing block 2 is close to the movable spring 61 of the movable spring part 6.

In this embodiment, as shown in fig. 13 and 14, the magnetic circuit portion 5 includes a coil former 51, an enamel wire 52, a yoke 54, a compression spring 55 and an iron core 53, wherein the enamel wire 52 is wound around the coil former 51, two ends of the enamel wire 52 are respectively fixed on two welding tabs 56 arranged on the coil former 51, the iron core 53 is penetrated in the coil former 51, the yoke 54 is L-shaped, one side of the yoke 54 is matched with the outer side of the coil former 51, and the other side of the yoke is riveted and fixed with one end of the iron core 53. The other side of the armature 1 is matched with the other end of the iron core 53, one side of the armature 1, a pushing block 2 and a bracket 3 on the side of the armature are matched with the outer side of one side of a yoke 54, and a hook 31 on the bracket 3 is hung on a hanging table correspondingly arranged on the base 4; the compression spring 55 is riveted to one side of the yoke 54 and bears against the armature component.

In the present embodiment, as shown in fig. 15, the movable spring portion 6 includes a movable spring 61, a movable contact 62 provided on the movable spring 61, a movable spring lead pin 63, and a quick connection terminal 64. The pushing block 2 is propped against the movable spring 61. As shown in fig. 16, the stationary spring portion 7 includes a stationary spring piece 71, a stationary contact 72 provided on the stationary spring piece 71, and the stationary spring piece 71 is integrally formed with a stationary spring lead-out pin 73 and a quick-connect terminal 74. The housing 8 penetrates up and down and contains the base 4, the magnetic circuit part 5, the armature part, the moving spring part 6 and the static spring part 7, the quick connection terminals 64 and 74 are exposed out of the upper end of the housing 8, and the moving spring lead-out pin 63, the static spring lead-out pin 73 and the two welding tabs 56 are respectively exposed out of the lower end of the housing 8.

The above embodiments are only for illustrating the technical solution of the present utility model, but not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and therefore all other embodiments obtained by those skilled in the art without making creative efforts are intended to fall within the protection scope of the present utility model.

Claims (10)

1. An armature component comprising an armature, a push block and a bracket, wherein:

the armature is provided with a beam;

the pushing block is made of thermosetting materials, the pushing block is fixed with the cross beam of the armature, the length dimension of the pushing block is not smaller than the length dimension of the cross beam, the width dimension of the pushing block is not smaller than the width dimension of the cross beam, and the pushing block completely covers one side, contacted with the pushing block, of the cross beam;

the support is made of thermoplastic materials, the support is combined with the armature and the pushing block which are fixed mutually in an injection molding mode, and the armature, the pushing block and the support form an integral piece through injection molding.

2. The armature component of claim 1, wherein: the pushing block comprises a fixing seat and a boss, the fixing seat is fixed with the cross beam, the fixing seat is configured to be a nonlinear shortest creepage path from one side of the fixing seat, which is close to the cross beam, to the other side, which is far away from the cross beam, the fixing seat and the cross beam are wrapped inside the bracket in an injection molding mode, and the boss protrudes outside the bracket.

3. The armature component of claim 2, wherein: one side of the fixing seat, which is contacted with the cross beam, is provided with a first retaining wall which extends to the side edge of the cross beam to increase the creepage distance.

4. The armature component of claim 2, wherein: the periphery of the fixing seat is provided with a step structure along the creepage direction.

5. The armature component of claim 4, wherein: the step structure is provided with a first step and a second step at least in sequence from the direction close to the cross beam to the direction far away from the cross beam, and a second retaining wall for increasing the creepage path is arranged on one side of the first step far away from the cross beam.

6. The armature component of claim 2, wherein: the armature comprises a first armature section and a second armature section which are connected, the first armature section and the second armature section are connected into an L shape, one end of the first armature section, which is far away from the second armature section, is provided with the cross beam, one side of the cross beam, which is close to the second armature section, is provided with a groove, two sides of the groove are respectively provided with two connecting arms, and the two connecting arms are connected with the cross beam.

7. The armature component of claim 6, wherein: the crossbeam is rectangle, and two linking arms are connected to a long limit of crossbeam, the fixing base be with the rectangle of crossbeam looks adaptation, one side of fixing base that contacts with the crossbeam is provided with two first barricades that are used for sheltering from two long limits of crossbeam respectively, is equipped with step structure around the fixing base, and step structure is equipped with one-level step and second grade step at least in proper order from being close to the crossbeam to the direction of keeping away from the crossbeam, and one side of keeping away from the crossbeam of two long limits of at least one-level step is provided with two second barricades that increase creepage path.

8. The armature component of claim 2, wherein: the boss integrated into one piece in the fixing base back to the crossbeam one side, the cross-section of boss personally submits square, the boss has four sides, and the slope of at least two of them opposite sides is less than 50 and with the top surface smooth transition of boss.

9. The armature component of claim 8, wherein: the slopes of the two side surfaces of the boss in the length direction are less than 50 degrees.

10. An electromagnetic relay with high creepage performance is characterized in that: comprising an armature component according to any one of claims 1 to 9.