CN112271113A

CN112271113A - Relay capable of preventing contact adhesion

Info

Publication number: CN112271113A
Application number: CN202011191798.4A
Authority: CN
Inventors: 唐俊平
Original assignee: Sanyou Corp Ltd
Current assignee: Sanyou Corp Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-26

Abstract

The invention relates to the technical field of relays, in particular to a relay for preventing contact adhesion.A static contact end surface is a plane, a moving contact end surface is an arc surface, and the center of the moving contact and the center of the static contact are staggered; the moving electrode is provided with a yielding hole for the rod body to pass through, and the hole wall of the yielding hole is inclined to form a chamfer. When the moving contact is in contact with the static contact, the moving electrode can be inclined and displaced under the pressure of the static contact, so that a twisting displacement exists between the moving contact and the static contact, sliding friction exists between the moving contact and the static contact, electric arcs between the moving contact and the static contact are eliminated, parts tending to fusion welding are changed, and adhesion between the moving contact and the static contact is broken through twisting; similarly, after the coil is powered off, the buffer spring enables the moving electrode to tend to restore to be arranged flatly, so that the moving contact and the static contact are separated to generate twisting displacement, and the effect of twisting the moving contact and the static contact to be adhered is achieved.

Description

Relay capable of preventing contact adhesion

Technical Field

The invention relates to the technical field of relays, in particular to a relay capable of preventing contact adhesion.

Background

As a component for controlling high voltage at low voltage, a relay is widely applied to various high-voltage devices, so that people can safely control various large devices, thereby avoiding the danger of electric shock. Through the development of many years, the types of relays are more and more, and a push-rod relay is just one of the relays, and the operating principle of the push-rod relay is that after a coil is electrified, an armature and a push rod are attracted by a fixed iron core to move upwards, so that a moving contact connected to the push rod is driven to be in contact with a fixed contact, and the electrification of a high-voltage end is realized.

The contact is one of the important parts of the relay, and most of accidents happen to the control circuit because the contact of the relay is not broken completely, adhesion occurs, electric arcs are easy to generate, and potential safety hazards exist.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a relay for preventing contact adhesion, which can avoid adhesion when a moving contact and a static contact are mutually closed or disconnected.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a relay of contact adhesion prevention, including the casing and set up in the static electrode of casing, the tip of static electrode is equipped with the static contact, be equipped with electromagnetic component and push rod subassembly in the casing, electromagnetic component includes fixed iron core, armature, coil and the elastic component that resets, the coil is around outside armature and fixed iron core, armature can move towards fixed iron core, the elastic component that resets is used for exerting the reset force to armature, push rod subassembly includes the body of rod and the moving electrode of cup jointing in the tip of the body of rod, the moving electrode is equipped with the moving contact that is used for butt static contact, the body of rod is connected with armature looks fixed; the rod body is sleeved with a buffer spring, and the buffer spring upwards supports the moving electrode; the end face of one of the moving contact and the static contact is a plane, the end face of the other one is an arc face, and the center of the moving contact and the center of the static contact are staggered; the middle part of the moving electrode is provided with a yielding hole for the rod body to pass through, and the hole wall of the yielding hole is inclined to form a chamfer so that the moving electrode can be inclined to move.

Preferably, the end face of the moving contact is an arc face, and the end face of the static contact is a plane.

Preferably, a guide post is arranged in the housing, the moving electrode is provided with a guide hole, the side wall of the guide hole is inclined to form a chamfer, and the guide post penetrates through the guide hole.

Preferably, the outer side of the static electrode is provided with an annular protrusion, the shell is provided with a clamping groove matched with the annular protrusion, and the side part of the static electrode is provided with a limiting plane, so that the static electrode is prevented from rotating relative to the shell.

Preferably, the rod body is sleeved with a rod sleeve at the outer side, and the end part of the rod sleeve is inserted into the armature in an interference fit manner.

Preferably, the rod sleeve is provided with a limiting protrusion, and the top of the fixed iron core is provided with a limiting step capable of supporting the limiting protrusion upwards.

Preferably, the top joint of the body of rod has the clamp, and the clamp supports the dynamic electrode downwards.

Preferably, the top of the armature and the bottom of the fixed iron core are provided with positioning grooves for embedding two ends of the reset elastic piece.

The invention has the beneficial effects that:

according to the relay for preventing contact adhesion, the end face of one of the moving contact and the fixed contact is a plane, the end face of the other one of the moving contact and the fixed contact is an arc face, and the center of the moving contact and the center of the fixed contact are staggered; the middle part of the moving electrode is provided with a yielding hole for the rod body to pass through, and the hole wall of the yielding hole is inclined to form a chamfer so that the moving electrode can be inclined to move. When the moving contact is in contact with the static contact, the moving contact and the static contact are in arc surface-plane contact, the centers of the moving contact and the static contact are staggered in combination, and the hole wall of the abdicating hole is chamfered, so that the moving electrode can be obliquely displaced under the pressure of the static contact, a twisting displacement exists between the moving contact and the static contact, sliding friction exists between the moving contact and the static contact, electric arcs between the moving contact and the static contact are eliminated, parts tending to fusion welding are changed, and adhesion between the moving contact and the static contact is rubbed off; similarly, after the coil is powered off, the buffer spring makes the moving contact tend to restore to the flat arrangement, so that the moving contact and the static contact are separated to generate twisting displacement, and the effect of twisting the moving contact and the static contact to be adhered is also achieved.

Drawings

Fig. 1 is a schematic structural diagram of a relay for preventing contact adhesion in an embodiment.

Fig. 2 is a sectional view taken along a-a in fig. 1.

Fig. 3 is a sectional view taken along B-B in fig. 1.

Fig. 4 is a cross-sectional view of a moving electrode in an embodiment, hiding the moving contact.

Reference numerals:

a housing 1;

the static electrode 2, the static contact 21, the annular bulge 22 and the limit plane 23;

a guide post 3;

the electromagnetic assembly 4, the fixed iron core 41, the limit step 411, the positioning groove 412, the armature 42, the coil 43 and the reset elastic piece 44;

the push rod assembly 5, the rod body 51, the rod sleeve 52, the limiting protrusion 521, the moving electrode 53, the moving contact 531, the abdicating hole 532, the guide hole 533, the buffer spring 54, the hoop 55 and the tray 56.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

The relay for preventing contact adhesion in the present embodiment, as shown in fig. 1 to 4, includes a housing 1 and a static electrode 2 disposed on the housing 1, wherein a static contact 21 is disposed at an end of the static electrode 2. An electromagnetic assembly 4 and a push rod assembly 5 are arranged in the housing 1, the electromagnetic assembly 4 comprises a fixed iron core 41, an armature 42, a coil 43 and a reset elastic piece 44, the coil 43 is wound outside the armature 42 and the fixed iron core 41, the armature 42 can move towards the fixed iron core 41, and the reset elastic piece 44 is used for applying reset force to the armature 42. The push rod assembly 5 comprises a rod body 51 and a moving electrode 53 made of a copper sheet sleeved at the end part of the rod body 51, the moving electrode 53 is provided with a moving contact 531 used for abutting against the static contact 21, and the rod body 51 is fixedly connected with the armature 42. The rod body 51 is sleeved with a buffer spring 54, and the buffer spring 54 upwards supports the moving electrode 53. The end surface of the moving contact 531 is an arc surface with a slightly raised middle part, the end surface of the static contact 21 is a plane, in practice, the moving contact 531 is changed into a plane, and the static contact 21 can also be an arc surface. The centers of the movable contacts 531 and the fixed contacts 21 are offset from each other. The middle part of the moving electrode 53 is provided with a yielding hole 532 for the rod body 51 to pass through, and the hole wall of the yielding hole 532 is inclined to form a chamfer so that the moving electrode 53 can be obliquely displaced.

When the electric switch is used, after the coil 43 is electrified, the armature 42 is subjected to the action of suction force to overcome the action force of the reset elastic part 44 and move towards the fixed iron core 41, the armature 42 drives the rod body 51 and the moving electrode 53 to move towards the static electrode 2, when the moving contact 531 contacts the static contact 21, because the moving contact 531 and the static contact 21 are in arc surface and plane contact, the centers of the moving contact 531 and the static contact 21 are staggered, and the hole wall of the abdicating hole 532 is chamfered, under the pressure of the static contact 21, the moving electrode 53 can be obliquely displaced, so that a twisting displacement exists between the moving contact 531 and the static contact 21, sliding friction exists between the moving contact 531 and the static contact 21, electric arcs between the moving contact 531 and the; similarly, after the coil 43 is powered off, the buffer spring 54 makes the moving contact 53 tend to recover to the flat arrangement, i.e. the state perpendicular to the rod 51, so that the moving contact 531 and the static contact 21 also generate twisting displacement when separated, and the effect of twisting the two is also achieved.

In this embodiment, the top portion of the housing is provided with the guide post 3, the movable electrode 53 is provided with the guide hole 533, the side wall of the guide hole 533 is inclined to form a chamfer, and the guide post 3 passes through the guide hole 533, so that the movable electrode 53 moves up and down more stably without affecting the inclination displacement.

In this embodiment, the outside of static electrode 2 is equipped with annular protrusion 22, and casing 1 is equipped with the draw-in groove with annular protrusion 22 looks adaptation, and the lateral part of static electrode 2 is equipped with spacing plane 23 to prevent that static electrode 2 from rotating relative to casing 1, the mode of clamping realizes automated assembly more easily.

In this embodiment, the rod sleeve 52 is sleeved outside the rod body 51, the end portion of the rod sleeve 52 is inserted into the armature 42 in an interference fit manner, the rod sleeve 52 is provided with a limiting protrusion 521, and the top of the fixed iron core 41 is provided with a limiting step 411 capable of supporting the limiting protrusion 521 upwards to realize mutual matching and limiting.

In this embodiment, the top of the rod 51 is clamped with a clamp 55, and the clamp 55 is pressed against the moving electrode 53 to prevent the moving electrode 53 from separating from the rod 51.

In this embodiment, the top of the armature 42 and the bottom of the fixed iron core 41 are provided with positioning grooves 412 for the two ends of the elastic restoring element 44 to be embedded into, so that the elastic restoring element 44 can apply an acting force to the armature 42 more stably. A U-shaped tray 56 is provided at the bottom of the buffer spring 54 to allow the buffer spring 54 to be stably compressed and expanded in an oriented manner.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A relay for preventing contact adhesion comprises a shell and a static electrode arranged on the shell, wherein a static contact is arranged at the end part of the static electrode, an electromagnetic assembly and a push rod assembly are arranged in the shell, the electromagnetic assembly comprises a fixed iron core, an armature, a coil and a reset elastic part, the coil is wound outside the armature and the fixed iron core, the armature can move towards the fixed iron core, the reset elastic part is used for applying reset force to the armature, the push rod assembly comprises a rod body and a moving electrode sleeved at the end part of the rod body, the moving electrode is provided with a moving contact for abutting against the static contact, and the rod body is fixedly connected with the armature; the rod body is sleeved with a buffer spring, and the buffer spring upwards supports the moving electrode; the method is characterized in that: the end face of one of the moving contact and the static contact is a plane, the end face of the other one is an arc face, and the center of the moving contact and the center of the static contact are staggered; the middle part of the moving electrode is provided with a yielding hole for the rod body to pass through, and the hole wall of the yielding hole is inclined to form a chamfer so that the moving electrode can be inclined to move.

2. The relay of claim 1, wherein: the end face of the moving contact is an arc face, and the end face of the static contact is a plane.

3. The relay of claim 1, wherein: be equipped with the guide post in the shell, the moving electrode is opened there is the guiding hole, and the lateral wall slope of guiding hole forms the chamfer, and the guide post passes the guiding hole.

4. The relay of claim 1, wherein: the outside of static electrode is equipped with annular protrusion, and the casing is equipped with the draw-in groove with annular protrusion looks adaptation, and the lateral part of static electrode is equipped with spacing plane to prevent that the relative casing of static electrode from rotating.

5. The relay of claim 1, wherein: the outside cover of the body of rod has the pole cover, and the tip of pole cover inserts in the armature with interference fit.

6. The relay of claim 5, wherein: the rod sleeve is provided with a limiting bulge, and the top of the fixed iron core is provided with a limiting step capable of supporting the limiting bulge upwards.

7. The relay of claim 1, wherein: the top joint of the body of rod has the clamp, and the clamp supports the moving electrode downwards.

8. The relay of claim 1, wherein: the top of the armature iron and the bottom of the fixed iron core are provided with positioning grooves for embedding the two end parts of the reset elastic piece.