CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of the filing date under 35 U.S.C. ยง 119(a)-(d) of Chinese Patent Application No. 201811155249.4, filed on Sep. 30, 2018.
FIELD OF THE INVENTION
The present invention relates to a relay and, more particularly, to an electromagnetic relay.
BACKGROUND
An electromagnetic relay usually comprises a coil, an iron core inserted into the coil, a yoke riveted to the iron core, and an armature connected between the yoke and the iron core. When the coil is energized, an electromagnetic loop is formed among the yoke, the armature, and the iron core, and the armature moves under the action of electromagnetic force, thus realizing the switching action of electromagnetic relay.
The electromagnetic relay, however, includes too many components, which leads to a complex structure and low manufacturing efficiency. Moreover, because of too many components, excessive cumulative errors will result during assembling the electromagnetic relay, which is not conducive to the consistency of the function of the final products.
SUMMARY
An electromagnetic relay includes a base, a spool provided on the base, a coil wound on the spool, a yoke inserted into a hole formed in the spool, an armature movably provided on the base, a movable contact fixed on the base, a static contact fixed on the base, and a driving member connected between the armature and the movable contact. The yoke is L-shaped. The yoke and the armature form a rectangular magnetic loop.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example with reference to the accompanying Figures, of which:
FIG. 1 is an exploded perspective view of an electromagnetic relay according to an embodiment;
FIG. 2 is a perspective view of the electromagnetic relay in an assembled state; and
FIG. 3 is a sectional perspective view of the electromagnetic relay.
DETAILED DESCRIPTION OF THE EMBODIMENT(S)
Exemplary embodiments of the present disclosure will be described hereinafter in detail with reference to the attached drawings, wherein like reference numerals refer to like elements. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will convey the concept of the disclosure to those skilled in the art.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
An electromagnetic relay according to an embodiment, as shown in FIGS. 1-3, comprises a base 10, a spool 20, a coil 30, a yoke 40, an armature 50, a movable contact 71, 71a, a static contact 72, 72a, and a driving member 60. The spool 20 is provided on the base 10. The coil 30 is wound on the spool 20. The yoke 40 is inserted into a hole 21 formed in the spool 20. The armature 50 is movably disposed on the base 10. The movable contact 71, 71a is fixed on the base 10. The static contact 72, 72a is fixed on the base 10. The driving member 60 is connected between the armature 50 and the movable contact 71, 71a.
In the embodiment shown in FIGS. 1-3, each of the yoke 40 and the armature 50 is L-shaped, and the yoke 40 and the armature 50 form a rectangular magnetic loop.
When the coil 30 is energized, the armature 50 drives the driving member 60 to move under the action of magnetic force, and the driving member 60 drives the movable contact 71, 71a to move towards the static contact 72, 72a, so that the movable contact 71, 71a electrically contacts the static contact 72, 72a. When the coil 30 is de-energized, the movable contact 71, 71a moves away from the static contact 72, 72a under the action of its elastic restoring force, so that the movable contact 71, 71a and the static contact 72, 72a are electrically separated.
As shown in FIGS. 1-3, the yoke 40 includes a main body 41 and an extension end 42 connected to an upper end of the main body 41 and perpendicular to the main body 41. The armature 50 includes a main body 51 and an extension end 52 connected to a lower end of the main body 51 and perpendicular to the main body 51. The main body 41 of the yoke 40 and the main body 51 of the armature 50 are arranged opposite to each other to form a first pair of opposite sides of the rectangular magnetic loop. The extension end 42 of the yoke 40 and the extension end 52 of the armature 50 are arranged opposite to each other to form a second pair of opposite sides of the rectangular magnetic loop. The extension end 42 of the yoke 40 is arranged to face the upper end of the main body 51 of the armature 50. The extension end 52 of the armature 50 is arranged to face the lower end of the main body 41 of the yoke 40.
As shown in FIGS. 1-3, the main body 41 of the yoke 40 is inserted into the hole 21 of the spool 20, and the extension end 42 of the yoke 40 is located outside the spool 20. The extension end 42 of the yoke 40 has a width larger than that of the main body 41 of the yoke 40, and the upper end of the main body 51 of the armature 50 has a width larger than a remainder of the main body 51 of the armature 50. In this way, an area of the extension end 42 of yoke 40 facing the upper end 51 of main body 51 of the armature 50 is increased, increasing the magnetic force between the extension end 42 of the yoke 40 and the upper end of the main body 51 of the armature 50.
In the shown embodiment, the base 10 and the spool 20 are formed as a single integral component. For example, in an exemplary embodiment, the base 10 and the spool 20 may be formed as a single injection molding component. The base 10 and the spool 20 need not be manufactured separately, and a step of assembling the spool 20 onto the base 10 is omitted.
As shown in FIG. 1, a receiving slot 12 is formed at one end of the base 10 near the spool 20, and the extension end 52 of the armature 50 is received in the receiving slot 12.
The electromagnetic relay, as shown in FIGS. 1-3, includes an elastic pressing member 80 that is fixed in the receiving slot 12 of the base 10 and pressed against the outer side of the lower end of the main body 51 of the armature 50, so as to position the armature 50 in the slot 12 and provide an auxiliary thrust to the armature 50. The elastic pressing member 80 is constructed to prevent the extension end 52 of the armature 50 from being moved to the outside of the slot 12, so that the armature 50 is positioned reliably in the receiving slot 12. The elastic pressing member 80 is adapted to exert a certain auxiliary thrust on the armature 50, and the auxiliary thrust together with the magnetic force acting on the armature 50 is used to push the armature 50 to swing. Thus, the magnetic force needed to drive the armature 50 to swing may be reduced.
The elastic pressing member 80, as shown in FIG. 1, has a base part 82 and an elastic sheet 81 connected to the base part 82. The base part 82 of the elastic pressing member 80 is located below the bottom surface of the extension end 52 of the armature 50 and fixed in the slot 12 in an interference fit manner. The elastic sheet 81 of the elastic pressing member 80 is elastically pressed against the outer side of the lower end of the main body 51 of the armature 50.
The movable contact 71, 71a, as shown in FIGS. 1 and 2, has a movable elastic arm 71 and a movable contact point 71a provided on an upper end of the movable elastic arm 71. A lower end of the movable elastic arm 71 is fixed on the base 10, for example, is assembled in a groove formed in the base 10. The static contact 72, 72a has a static elastic arm 72 and a static contact point 72a provided on an upper end of the static elastic arm 72. A lower end of the static elastic arm 72 is fixed on the base 10, for example, is assembled in a groove formed in the base 10. In the shown embodiment, the movable contact point 71a is formed as a separate contact component mounted on the movable elastic arm 71, and the static contact point 72a is formed as a separate contact component mounted on the static elastic arm 72. In other embodiments, the movable contact point 71a may be a convex part integrally formed on the movable elastic arm 71, and the static contact point 72a may be a convex part integrally formed on the static elastic arm 72.
As shown in FIGS. 1-3, the upper end of the armature 50 is inserted into a slot formed in a first end of the driving member 60, and a second end of the driving member 60 is inserted into a slot formed in the upper end of the movable elastic arm 71. In this way, the driving member 60 is connected between the armature 50 and the movable elastic arm 71.
The electromagnetic relay, as shown in FIGS. 1 and 2, comprises a pair of coil pins 31, 32 for electrically connecting the coil 10 to an external power supply. The pair of coil pins 31, 32 are fixed on the base 10 and electrically connected to the coil 10.
The electromagnetic relay, as shown in FIG. 1, comprises a housing 1 adapted to be hermetically assembled on the base 10. The coil 30, the yoke 40, the armature 50, the movable contact 71, 71a, the static contact 72, 72a, and the driving member 60 are sealed and contained in the housing 1.
It should be appreciated for those skilled in this art that the above embodiments are intended to be illustrated, and not restrictive. For example, many modifications may be made to the above embodiments by those skilled in this art, and various features described in different embodiments may be freely combined with each other without conflicting in configuration or principle.
Although several exemplary embodiments have been shown and described, it would be appreciated by those skilled in the art that various changes or modifications may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.
Patent Application
20200105489
