CN116741581A - Relay for preventing AC tail sound - Google Patents

Abstract

The invention provides a relay for preventing alternating current tail sound, which comprises a wire frame, a coil wound on the wire frame, a yoke iron arranged outside the coil, an iron core penetrating into the wire frame, an armature iron contacted with a knife edge surface of the yoke iron, a movable spring component connected with the yoke iron and the armature iron, and a static spring component matched with the movable spring component, wherein the yoke iron is arranged on the yoke iron; the iron core is provided with a pole shoe surface which is arranged corresponding to the armature clapping surface, a short circuit ring is arranged at the position, close to the pole shoe surface, of the iron core, and the pole shoe surface is provided with a first side end, close to the knife edge surface of the yoke iron, and a second side end, away from the knife edge surface of the yoke iron; the pole shoe surface is an inclined surface with a high first side end and a low second side end, so that when the armature iron contacts the iron core, a seamless smooth joint is formed between the pole shoe surface of the iron core and the armature iron. The alternating current tail sound can be effectively eliminated.

Description

Relay for preventing AC tail sound

Technical Field

The invention relates to the field of relays, in particular to a relay for preventing alternating current tail sound.

Background

An electromagnetic relay is an electronic control device, and is an electric appliance in which a controlled amount is subjected to a predetermined step change in an electric output circuit when a change in an input amount (excitation amount) reaches a prescribed requirement. It has an interactive relationship between the control system (also called input loop) and the controlled system (also called output loop). It is commonly used in automated control circuits and is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, the circuit plays roles of automatic regulation, safety protection, circuit switching and the like.

In the existing relay, the pole shoe surface of the traditional iron core is a plane, the knife edge surface of the yoke iron and the pole shoe surface of the iron core have a fall, when the relay acts, the rotating fulcrum of the armature is arranged on the knife edge of the yoke iron, when the armature rotates to the pole shoe surface of the iron core, the armature and the pole shoe surface of the iron core form an angle, a gap exists between the two surfaces, the gap is necessarily formed, the larger the gap (the larger the angle) is, the larger the loss of the magnetic field attraction is, and the alternating current tail sound is more easy to generate. The ac tail sounds can accelerate contact erosion, causing early failure of the relay.

Disclosure of Invention

Therefore, the relay for preventing the alternating current tail sound can effectively prevent the alternating current tail sound from being generated and avoid early failure of the relay.

In order to achieve the above purpose, the technical scheme provided by the invention is as follows:

a relay for preventing AC tail sound comprises a wire frame, a coil wound on the wire frame, a yoke iron arranged outside the coil, an iron core penetrating into the wire frame, an armature iron connected with a knife edge surface of the yoke iron, a movable spring component connected with the yoke iron and the armature iron, and a static spring component matched with the movable spring component; the iron core is provided with a pole shoe surface which is arranged corresponding to the clapping surface of the armature, a short circuit ring is arranged at a position close to the pole shoe surface, and the pole shoe surface of the iron core is provided with a first side end close to the knife edge surface of the yoke and a second side end far away from the knife edge surface of the yoke; the pole shoe surface of the iron core is an inclined surface with a high first side end and a low second side end, so that when the armature iron contacts the iron core, a seamless smooth fit is formed between the pole shoe surface of the iron core and the armature iron.

Further, the armature is provided with a boss corresponding to the pole shoe surface, the surface of the boss is the clapping surface, and the armature is contacted with the pole shoe surface of the iron core through the boss surface.

Further, the area of the boss is slightly larger than the pole shoe surface of the iron core.

Further, the pole shoe surface of the iron core is recessed downwards to form a through concave part, and the concave part divides the pole shoe surface of the iron core into two parts; the shorting ring is disposed within the recess and surrounds one of the pole shoe faces, defining a portion surrounded by the shorting ring as a first portion and the other portion as a second portion.

Further, a connecting centerline of the first side end to the second side end of the pole shoe face is defined as a contact centerline, and a length extension line of the recess is perpendicular to the contact centerline.

Further, the first portion is proximate the second side end and the second portion is proximate the first side end.

Further, the shape of the short circuit ring is a D shape or a square shape.

Further, a first flange and a second flange are respectively arranged at two ends of the wire frame, the coil is arranged between the first flange and the second flange, and the armature corresponds to the first flange; the yoke iron is of an L-shaped structure and is provided with a vertical part and a transverse part, the vertical part is arranged vertically, the transverse part is arranged transversely, the vertical part is positioned at the outer side of the coil, and the end face of the vertical part is the knife edge surface; the transverse portion corresponds to the second flange and is fixed with the iron core.

The technical scheme provided by the invention has the following beneficial effects:

the pole shoe surface of the iron core is designed into an inclined plane, and after the relay is attracted, the clapping surface of the armature and the pole shoe surface of the iron core realize seamless smooth attachment, so that the loss of magnetic field attraction force is avoided, the AC relay is attracted more reliably, and the AC tail sound is effectively eliminated.

Drawings

FIG. 1 is a schematic view showing an internal structure of a relay according to an embodiment;

fig. 2 is a schematic diagram of a part of a structure of the relay according to the embodiment before the armature and the core are attached;

fig. 3 is a schematic diagram of a part of a structure of a relay according to an embodiment after an armature and an iron core are attached;

fig. 4 is a perspective view showing a part of the structure of the relay according to the embodiment;

FIG. 5 is a schematic view showing the structure of the iron core according to the embodiment;

fig. 6 shows a schematic diagram of the armature in an exemplary embodiment;

fig. 7 shows a top view of the iron core in an embodiment.

In the figure: 11 bobbins, 12 coils, 20 yokes, 21 vertical parts, 22 transverse parts, 40 iron cores, 201 knife edge surfaces, 30 armatures, 31 bosses, 13 moving spring assemblies, 14 static spring assemblies, 41 pole shoe surfaces, 50 short-circuit rings, 401 first side ends, 402 second side ends, 42 concave parts, 411 first parts and 412 second parts.

Detailed Description

For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The invention will now be further described with reference to the drawings and detailed description.

Referring to fig. 1 to 7, the present embodiment provides a relay for preventing ac tail sounds, comprising a bobbin 11, a coil 12 wound on the bobbin 11, a yoke 20 disposed outside the coil 12, an iron core 40 penetrating into the bobbin 11, an armature 30 connected to a knife edge surface 201 of the yoke 20, a moving spring assembly 13 connected to the yoke 20 and the armature 30, and a static spring assembly 14 for cooperating with the moving spring assembly 13; this enables a basic assembly of the relay.

Specifically, the iron core 40 has a pole shoe surface 41 disposed corresponding to the clapping surface of the armature 30, the iron core 40 is provided with a short circuit ring 50 near the pole shoe surface 41, and the pole shoe surface 41 of the iron core 40 has a first side end 401 near the knife edge surface 201 of the yoke 20 and a second side end 402 far from the knife edge surface 201 of the yoke 20; the pole shoe surface 41 of the iron core 40 is an inclined surface with a high first side end 401 and a low second side end 402, so that when the armature 30 is clapped to the iron core 40, a seamless flat joint is formed between the pole shoe surface 41 of the iron core 40 and the clapping surface of the armature 30, as shown by a reference numeral a in fig. 3. By the arrangement, after the relay is attracted, the armature 30 and the pole shoe face 41 of the iron core 40 realize seamless smooth attachment, so that magnetic flux loss is avoided, the relay is attracted more reliably, and alternating current tail sound is effectively eliminated.

At the same time, the core 40 is provided with a short-circuit ring 50 at a position close to the pole shoe face 41, which short-circuit ring 50 divides the magnetic flux phi in the working air gap into a magnetic flux phi 1 surrounded by the short-circuit ring 50 and a magnetic flux phi 2 not surrounded by the short-circuit ring 50. In operation, an induced current is generated in the shorting ring 50 that impedes the change in magnetic flux, i.e., the shorting ring 50 produces a magnetic reactance that causes the magnetic flux Φ1 to lag behind Φ2 by a phase angle. Because the magnetic flux phi 1 and the magnetic flux phi 2 are out of phase in time, under the combined action of the magnetic flux phi 1 and the magnetic flux phi 2, the attraction force acting on the armature 30 at any moment is not equal to zero (zero crossing is not performed at the same time), so that the relay is more than the counter force to realize stable closing of the relay.

Further, in this embodiment, the armature 30 has a boss 31 disposed corresponding to the pole shoe surface 41, and the armature 30 contacts the pole shoe surface 41 of the core 40 through the surface of the boss 31, and the surface of the boss 31 is the clapping surface. By adopting the boss 31 structure, the surface (i.e. the clapping surface) of the armature 30, which is contacted with the pole shoe surface 41, is independently processed, so that the flatness of the surface is ensured, and the seamless contact between the armature 30 and the pole shoe surface 41 is better ensured. More specifically, the area of the boss 31 is slightly larger than that of the pole shoe surface 41, so that the boss 31 can completely cover the pole shoe surface 41, and complete contact and close adhesion are ensured. Of course, this is not limiting in other embodiments.

Further, in this embodiment, the pole shoe surface 41 of the iron core 40 is recessed downward with a through recess 42, and the recess 42 divides the pole shoe surface 41 of the iron core 40 into two parts; the shorting ring 50 is disposed within the recess 42 and surrounds one of the pole shoe faces 41. The part surrounded by the short circuit ring 50 is defined as a first part 411, the other part is defined as a second part 412, and the magnetic flux at the position of the first part 411 is the magnetic flux phi 1 surrounded by the short circuit ring 50; the magnetic flux at the location of the second portion 412 is the magnetic flux Φ2 not surrounded by the shorting ring 50.

Further, in this embodiment, as shown in fig. 7, a connecting centerline between the first side end 401 and the second side end 402 of the pole shoe face 41 is defined as a contact centerline A1, and a length extension line A2 of the recess 42 is perpendicular to the contact centerline A1; the arrangement is that the distribution of the magnetic flux phi 1 and the magnetic flux phi 2 on the left side and the right side of the contact center line A1 are equal, so that the suction center line coincides with the contact center line A1, and the effect of eliminating the alternating current tail sound is better.

More specifically, the first portion 411 is adjacent to the second side end 402, and the second portion 412 is adjacent to the first side end 401.

Further, in this embodiment, the shape of the shorting ring 50 is "D" shape, which is convenient for assembly. Of course, in other embodiments, square, etc. are also possible.

Further, in this embodiment, a first flange and a second flange are respectively disposed at two ends of the bobbin 11, the coil 12 is disposed between the first flange and the second flange, and the armature 30 corresponds to the first flange; the yoke 20 is in an L-shaped structure and is provided with a vertical part 21 arranged vertically and a transverse part 22 arranged transversely, the vertical part 21 is positioned at the outer side of the coil 12, and the end surface of the vertical part 21 is the knife edge surface 201; the lateral portion 22 corresponds to the second flange of the bobbin 11 and is fixed to the core 40. The stable assembly of the relay component is realized. Of course, in other embodiments, the structure of the bobbin 11, the arrangement position of the coil 12, the structure of the yoke 20, and the fixing manner are not limited thereto.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A relay for preventing AC tail sound comprises a wire frame, a coil wound on the wire frame, a yoke iron arranged outside the coil, an iron core penetrating through the wire frame, an armature iron connected with a knife edge surface of the yoke iron, a movable spring component connected with the yoke iron and the armature iron, and a static spring component matched with the movable spring component; the method is characterized in that: the iron core is provided with a pole shoe surface which is arranged corresponding to the clapping surface of the armature, a short circuit ring is arranged at a position close to the pole shoe surface, and the pole shoe surface is provided with a first side end close to the knife edge surface of the yoke and a second side end far away from the knife edge surface of the yoke; the pole shoe surface is an inclined surface with a high first side end and a low second side end, so that when the armature contacts the iron core, a seamless smooth fit is formed between the pole shoe surface and the armature.

2. The relay for preventing ac tail sounds according to claim 1, wherein: the armature is provided with a boss corresponding to the pole shoe surface, the surface of the boss is the clapping surface, and the armature is contacted with the pole shoe surface of the iron core through the boss surface.

3. The relay for preventing ac tail sounds according to claim 2, wherein: the area of the boss is slightly larger than that of the pole shoe face.

4. The relay for preventing ac tail sounds according to claim 1, wherein: the pole shoe face is downwards sunken with a concave part which divides the pole shoe face into two parts; the shorting ring is disposed within the recess and surrounds one of the pole shoe faces, defining a portion surrounded by the shorting ring as a first portion and the other portion as a second portion.

5. The relay for preventing ac tail sounds according to claim 4, wherein: the connecting center line from the first side end to the second side end of the pole shoe surface is defined as a contact center line, and the length extension line of the concave part is perpendicular to the contact center line.

6. The relay for preventing ac tail sounds according to claim 5, wherein: the first portion is adjacent the second side end and the second portion is adjacent the first side end.

7. The relay for preventing ac tail sounds according to claim 4, wherein: the shape of the short circuit ring is D-shaped or square.

8. The relay for preventing ac tail sounds according to claim 1, wherein: the coil is arranged between the first flange and the second flange, and the armature corresponds to the first flange; the yoke iron is of an L-shaped structure and is provided with a vertical part and a transverse part, the vertical part is arranged vertically, the transverse part is arranged transversely, the vertical part is positioned at the outer side of the coil, and the end face of the vertical part is the knife edge surface; the transverse portion corresponds to the second flange and is fixed with the iron core.