CN201051473Y

CN201051473Y - Safety relay

Info

Publication number: CN201051473Y
Application number: CNU2007201090496U
Authority: CN
Inventors: 张吕生
Original assignee: NINGBO JINHAI ELECTRONIC CO Ltd
Current assignee: NINGBO JINHAI ELECTRONIC CO Ltd
Priority date: 2007-05-10
Filing date: 2007-05-10
Publication date: 2008-04-23
Anticipated expiration: 2017-05-10

Abstract

The utility model relates to a safety relay, comprising an outer cover, a base, an electromagnetic system, a contact system, and a pushing card, and is characterized in that the pushing card is arranged on one side in the outer cover of the relay, one end is connected with an extension end of an armature, the other end is connected with a restoring reed, two small straight flutes which are arranged on the position inclined to the right of the middle portion of the pushing card are connected with ends of two movable contact springs, the armature and the two movable contact springs form a mechanical interlock through the pushing card, an insulating body is additionally arranged between the contact system and the electromagnetic system, and an insulating baffle plate is arranged between the moveable and a stationary contact springs in the contact system. The relay with the above structure is provided with forced guide, a normally opened contact and a normally-closed contact cannot be simultaneously closed, in the whole service life period, the distance between contacts which are in the interrupted state is provided with the minimum distance of 0.5 mm. The basic conditions are provided for a self-detecting system to ensure that the power supply can be safely interrupted when abnormal situations occur.

Description

Safety relay

Technical field

The utility model relates to a kind of relay, has the safety relay of forced guiding contact.

Background technology

No mechanical interlock between relay two movable contact springs of conventional structure, as molten clinging after the normally opened contact closure of one side, when coil blackout discharges, the movable contact spring of another side still can move, still can restore after this another side normally opened contact closure, the relay static contact spring piece of conventional structure does not have dividing plate and block is spacing, and the contact is meltable sticking, the closed simultaneously dangerous situation of normally opened contact, normally-closed contact might occur, reason is no forced guiding.Because push card is movable at relay middle part, there is the slit to communicate between electromagnetic system and contact system, creepage path is not intercepted, and the leakage path that is not less than 10mm be cannot say for sure card.Do not have reset reed, the recuperability of depending merely on movable contact spring is difficult to force to disconnect closed normally opened contact in some cases, and relay reliability is low.Do not have insulating barrier, insulating spacer, blow as the reed accident, naked stops that fail safe is low.The armature adjutage is short, and the push card stroke is little, and contact gap is difficult to guarantee.As shown in Figure 4.

Summary of the invention

The purpose of this utility model is: the fault of construction at above-mentioned relay exists, design a kind of safety relay with forced guiding contact.

Design of the present utility model is: safety relay, it comprises outer cover, pedestal, electromagnetic system, contact system and push card, it is characterized in that push card is located at a side in the relay outer cover, one end of push card is connected with the armature elongated end, the middle part of push card is connected with movable contact spring, and the other end is connected with reset reed; Set up insulator between contact system and the electromagnetic system; In contact system, set up insulating barrier between the sound reed.

The beneficial effects of the utility model are: because push card is located at the side in the relay outer cover and establishes insulator between electromagnetic system and contact system, so just increase the creepage path between two systems, guarantee the safe distance greater than 10mm.One end of push card is connected with the armature elongated end, and the other end is connected with reset reed, and the push card middle part takes over, and the position is provided with two little straight troughs and two movable contact spring ends socket-connect, and armature and two movable contact springs just form mechanical interlock by push card like this.Establish insulating barrier between the dynamic and static reed in contact system, so not only can strengthen the insulation between them, and cooperate with above-mentioned mechanical interlock and to make this relay have forced guiding, normally opened contact and normally-closed contact just can not be closed simultaneously, for self-detection system provides primary condition, guarantee when having abnormal conditions to occur that power safety ground disconnects.

Description of drawings

Fig. 1 is the utility model section of structure.

Fig. 2 is that the A of the utility model structure is to view.

Fig. 3 is the utility model three-dimensional structure diagram.

Fig. 4 is the structure chart of common relay.

Embodiment

With reference to Fig. 1, this safety relay is made up of outer cover 1, pedestal 14, electromagnetic system, contact system and push card 8.Electromagnetic system comprises iron core 4, bobbin 3, coil 2, yoke 5, armature 19 and armature stage clip 18.The transfer contact of two groups of symmetries is arranged in the contact system, and every group of transfer contact has two fixed contacts and a moving contact, and each contact riveting constitutes contact spring on a reed.The sound reed constitutes the contact spring group, and two contact spring groups constitute contact system.Movable contact spring 15 is each a slice of front and back, and the end of front and back movable contact spring is connected with push card 8, as shown in Figure 2.

With reference to Fig. 1,3, the insulating barrier in the contact system between the sound reed comprises right clapboard 13 and left clapboard 16.Right clapboard 13 has the thin plate of arc convex to the right for the upper end, and its end bosses is pressed close to right static contact spring piece 12 left surfaces mutually in the position near the contact, and this dividing plate the inside links to each other with mid-board plate 20, and the lower end links to each other with pedestal 14.Similarly, left clapboard 16 has the thin plate of arc convex left for the upper end, and its end bosses is pressed close to left static contact spring piece 17 right surfaces mutually in the position near the contact, and this dividing plate the inside links to each other with mid-board plate 20, and the lower end links to each other with pedestal 14.The profile of insulating spacer 9 with towards with the protruding identical of right clapboard 13 and be in sustained height, its inner end links to each other with mid-board plate 20, this insulating spacer 9 press close to mutually with the left surface of left static contact spring piece 17 and left clapboard 16 together that left static contact spring piece 17 is spacing.Insulator between contact system and the electromagnetic system by front and back sidewall paneling 21, be connected the isolation riser 7 of sidewall paneling 21 and be located at the mid-board plate 20 of isolating in the middle of the riser 7 and form.Be provided with sidewall paneling 21 before and after the electromagnetic system and link to each other with isolation riser 7 dual-sides, they are separated electromagnetic system and contact system together, have intercepted the creepage path between two systems, guarantee to have the spacing that is not less than 10mm.Mid-board plate 20 and isolation 7 vertical linking to each other of riser are positioned in the middle of the two reed groups, and the insulation that this mid-board plate 20 is strengthened between two reed groups reaches the requirement of safety relay.Establishing an isolation boss 10 on this mid-board plate 20 matches with the horizontal elongated slot 22 of push card; Establish at outer cover 1 top two convex tendons 24 with isolate boss 10 mutually scarf close, this isolations boss 10 has increased leakage distance between two movable contact spring ends with convex tendon 24, satisfies minimum leakage apart from being the safety standard of 5mm.Above-mentioned all insulating barriers, insulating spacer 9, sidewall paneling 21, isolation riser 7, mid-board plate 20 and pedestal 14 fuse, and are injection moldings.

With reference to Fig. 1, electromagnetic system and contact system interact by push card 8, and this push card 8 is a flat board, is located at the top in the relay outer cover 1.There is a straight trough to be connected in the middle of the left end of push card 8, owing to set up armature elongated end 6, the corresponding increase of the stroke of push card 8, the gap of increasing break contact with armature elongated end 6.The right-hand member of push card 8 is connected with the upper end of reset reed 11, and the lower end of reset reed 11 is connected with pedestal 14, and the ability that this reset reed 11 disconnects " closed normally opened contact " improves, and can strengthen the anti-molten sticking ability in contact.Establish a horizontal elongated slot 22 and match with isolating boss 10 on push card 8, isolate boss 10 and play the motion guide effect when push card 8 motions, the end of establishing two symmetrical little straight troughs 23 and front and back movable contact spring in these both sides of growing crosswise groove 22 socket-connects.Armature 19 and two movable contact springs 15 just form mechanical interlock by push card 8 like this, as shown in Figure 2.The relay of said structure has the forced guiding contact, for self-detection system provides primary condition, guarantees that power safety ground disconnects.

Under the normal condition, when electromagnetic excitation is arranged, the recuperability that the rotation drive push card 8 of armature 19 overcomes reset reed 11 and movable contact spring 15 moves right, pressure is turned right movable contact spring 15 and is pushed away, make the normally opened contact closure, because the obstruct of left clapboard 16 is arranged, make left static contact spring piece 17 be in the origin-location, the normally-closed contact of Duan Kaiing has the spacing of 0.5mm at least like this; During no electromagnetic excitation, reset reed 11 acts on power on the movable contact spring 15 by push card 8, and the recuperability of movable contact spring 15 is forced jointly movable contact spring 15 turned left and is pushed away, make the normally-closed contact closure, because the obstruct of right clapboard 13 is arranged, make right static contact spring piece 12 be in the origin-location, the normally opened contact of Duan Kaiing has the spacing of 0.5mm at least like this.The left static contact spring piece 17 of insulating spacer 9 pressures is in the origin-location does not allow it continue to guarantee that to left movement the spacing of contact system and electromagnetic system is not less than the safety standard of 10mm.

Under the improper situation, molten clinging after the normally opened contact closure, even there is not electromagnetic excitation, the position when right clapboard 13 forces movable contact spring 15 and right static contact spring piece 12 to be in their closures, left clapboard 16 makes left static contact spring piece 17 be in the origin-location, so just can guarantee that all normally-closed contact spacings are not less than 0.5mm.Molten clinging after the normally-closed contact closure, even electromagnetic excitation is arranged, position when left clapboard Final 16 pawl spring 15 and left static contact spring piece 17 are in their closures, right clapboard 13 makes right static contact spring piece 12 be in the origin-location, so just can guarantee that all normally opened contact spacings are not less than 0.5mm.

Generally speaking, in whole useful life period, normally opened contact and normally-closed contact can not be closed simultaneously, realize the requirement of safety function at relay.

Claims

1. safety relay, it comprises outer cover (1), pedestal (14), electromagnetic system, contact system and push card (8), it is characterized in that push card (8) is located at the side in the relay outer cover (1), one end of push card (8) is connected with armature elongated end (6), the middle part of push card (8) is connected with movable contact spring (15), and the other end is connected with reset reed (11); Set up insulator between contact system and the electromagnetic system; Set up insulating barrier between the sound reed in contact system.

2. safety relay according to claim 1 is characterized in that movable contact spring (15) is each a slice of front and back, and the end of front and back movable contact spring is connected with push card (8).

3. safety relay according to claim 1 is characterized in that establishing a horizontal elongated slot (22) on push card (8), the two symmetrical little straight troughs (23) that are connected with front and back movable contact spring (15) end are established in described elongated slot (22) both sides.

4. safety relay according to claim 1, it is characterized in that insulator by front and back sidewall paneling (21), connect the isolation riser (7) of sidewall paneling (21) and be located at the mid-board plate (20) of isolating in the middle of the riser (7) and forms, sidewall paneling (21), isolation riser (7) and mid-board plate (20) and pedestal (14) fuse.

5. safety relay according to claim 4 is characterized in that establishing an isolation boss (10) and matches with elongated slot (22) on mid-board plate (20).

6. safety relay according to claim 4 is characterized in that establishing the insulating spacer spacing to static contact spring piece (9) in mid-board plate (20) both sides.

7. safety relay according to claim 1, it is characterized in that insulating barrier is the thin plate that the end has projection, its end bosses is pressed close to the static contact spring piece surface mutually in the position near the contact, and the other end links to each other with pedestal (14), and the inside is connected with mid-board plate (20).

8. safety relay according to claim 1, it is characterized in that outer cover (1) top establish two convex tendons (24) with isolate boss (10) mutually scarf close.

9. safety relay according to claim 1 is characterized in that establishing reset reed (11) in a side of relay, and the one end links to each other with pedestal (14), and the other end is connected with push card (8).