CN211830212U

CN211830212U - Interlocking circuit

Info

Publication number: CN211830212U
Application number: CN202020759503.8U
Authority: CN
Inventors: 粟晓立
Original assignee: XIAMEN YUDIAN AUTOMATION TECHNOLOGY CO LTD
Current assignee: XIAMEN YUDIAN AUTOMATION TECHNOLOGY CO LTD
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2020-10-30
Anticipated expiration: 2030-05-09

Abstract

The utility model relates to an interlock circuit, the circuit includes first relay, second relay, third relay, time relay, fourth relay and fifth relay, and it is through introducing fourth relay and fifth relay to locate the coil return circuit of third relay with its normally closed contact, make under the condition that time relay only has two way control signal output, realized the electric interlock of three routes relay with lower cost, thereby can treat the switching circuit steadily and switch over the action, guarantee circuit safety.

Description

Interlocking circuit

Technical Field

The utility model relates to an electrical control technical field, more specifically say, relate to an interlocking circuit.

Background

Some existing electrical devices are generally required to provide a stable variable voltage power supply environment. Such as a meter burn-in test cabinet, which requires three different supply voltages to be provided, thereby improving the reliability of the test results. For power supply safety, when the power supply voltage is switched, the interlock problem of the multi-way switch is involved.

The existing interlock circuit for electrically interlocking the multi-way selector switch generally adopts an intelligent controller capable of outputting multi-way control signals to control the multi-way intermediate relay and realize the electrical interlocking. However, the intelligent controller adopted by the system is too high in cost and complex in algorithm. Thus, the existing interlock circuit has yet to be improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned technical problem, provide an interlocking circuit, its electric interlocking with lower cost realization change over switch to can treat steadily that the circuit that waits switches over the action, guarantee circuit safety.

In order to achieve the above purpose, the technical scheme of the utility model is that: an interlock circuit having first and second terminals configured as power supply ports and including first, second and third relays for effecting electrical interlock of the three relays; the interlock circuit further comprises a time relay, a fourth relay and a fifth relay;

a coil of the first relay, a normally closed contact of the second relay and a normally closed contact of the third relay are connected in series and then are connected in parallel with a coil of the fourth relay to form a first branch circuit;

a coil of the second relay, the normally closed contact of the first relay and the normally closed contact of the third relay are connected in series and then are connected in parallel with a coil of the fifth relay to form a second branch circuit;

a coil of the third relay, the normally closed contact of the first relay, the normally closed contact of the second relay, the normally closed contact of the fourth relay and the normally closed contact of the fifth relay are connected in series to form a third branch circuit;

the time relay is provided with a first time sequence switch and a second time sequence switch which are switched on according to a preset time sequence;

the first branch and the second branch are respectively connected in series with the first time sequence switch and the second time sequence switch to form a fourth branch and a fifth branch; the third branch, the fourth branch and the fifth branch are connected in parallel, and the common points of the third branch, the fourth branch and the fifth branch are connected to the first end and the second end.

In one embodiment: the coils of the time relay are connected to the first and second terminals.

In one embodiment: the first end or the second end is connected with a power supply through a manual switch.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the interlocking circuit provided by the embodiment of the utility model has the advantages that the fourth relay and the fifth relay are introduced, and the normally closed contact of the interlocking circuit is arranged on the coil loop of the third relay, so that the electric interlocking of the three relays is realized at lower cost under the condition that the time relay only has two paths of control signal output, and the switching action of the switching circuit can be stably treated, and the circuit safety is ensured;

(2) the utility model discloses interlock circuit owing to can set up ac contactor's coil on the normally open contact return circuit of first relay, second relay and third relay to make this interlock circuit can be used to the change over switch of heavy current environment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a circuit diagram of an interlock circuit according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence. In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, if the term "electrically connected" is used, it is meant to include both direct electrical connection and indirect electrical connection.

Referring to fig. 1, an embodiment of the present invention provides an interlock circuit having a first end and a second end configured as a power supply port, and including a first relay KA1, a second relay KA2, and a third relay KA3 for achieving electrical interlocking of the three relays. The first end and the second end are connected with a power supply, such as a fire wire end and a zero wire end.

Normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 cannot be closed simultaneously, so that stability of a circuit when a change-over switch acts is guaranteed, and circuit components are prevented from being damaged in a switching process. In the embodiment, the interlocking circuit further comprises a time relay, a fourth relay KA4 and a fifth relay KA 5.

In a specific circuit structure, the time relay is provided with a first timing switch AL1 and a second timing switch AL2 which are switched to be closed according to a preset timing, and coils of the time relay are connected to the first end and the second end. In this embodiment, the time relay is integrated in an intelligent instrument controller, and the model of the intelligent instrument controller is AI-716P.

And a coil of the first relay KA1, a normally closed contact of the second relay KA2 and a normally closed contact of the third relay KA3 are connected in series and then are connected with a coil of the fourth relay KA4 in parallel to form a first branch circuit.

And a coil of the second relay KA2, a normally closed contact of the first relay KA1 and a normally closed contact of the third relay KA3 are connected in series and then are connected with a coil of the fifth relay KA5 in parallel to form a second branch.

And a coil of the third relay KA3, a normally closed contact of the first relay KA1, a normally closed contact of the second relay KA2, a normally closed contact of the fourth relay KA4 and a normally closed contact of the fifth relay KA5 are connected in series to form a third branch.

The first timing switch AL1 and the second timing switch AL2 are respectively connected in series with the first branch and the second branch to form a fourth branch and a fifth branch. The third branch, the fourth branch and the fifth branch are connected in parallel, and the common points of the third branch, the fourth branch and the fifth branch are connected to the first end and the second end.

In addition, in this embodiment, the normally open contacts of the first relay KA1, the second relay KA2, and the third relay KA3 are connected in parallel and connected to the first end and the second end, so that an external circuit to be switched or an external load can be respectively disposed on the normally open contact loops of the relays to be powered by the first end and the second end, and perform corresponding switching on the external circuit. It should be understood that the normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 can also be arranged on an external circuit to be switched.

Therefore, the interlock circuit of the embodiment of the present invention has the following working principle:

because the coil of the time relay is connected to the first end and the second end, the time relay switches and closes the first timing switch AL1 and the second timing switch AL2 according to the preset timing after being electrified.

When the first timing switch AL1 is closed, the coils of the first relay KA1 and the fourth relay KA4 are energized, and the normally open contact of the first relay KA1 is closed to perform corresponding switching. Simultaneously, the normally closed contact disconnection of first relay KA1 and fourth relay KA4 for second relay KA2 and third relay KA 3's coil can not be circular telegram, has prevented that first relay KA1, second relay KA2 and third relay KA 3's normally open contact is closed simultaneously, makes the operational environment who treats the switched circuit stable, and the circuit security is high.

By the same principle, when the second timing switch AL2 is closed, the coils of the second relay KA2 and the fifth relay KA5 are energized, and the normally open contact of the second relay KA2 is closed to be switched accordingly. Simultaneously, the normally closed contact disconnection of second relay KA2 and fifth relay KA5 for first relay KA1 and third relay KA 3's coil also can not be switched on, has prevented that first relay KA1, second relay KA2 and third relay KA 3's normally open contact is closed simultaneously, makes the operational environment who treats the switched circuit stable equally, and the circuit security is high.

When the first timing switch AL1 and the second timing switch AL2 are both off, the coils of the first relay KA1, the second relay KA2, the fourth relay KA4 and the fifth relay KA5 are not electrified, so that the normally closed contacts of the third branch are all closed, the coil of the third relay KA3 is electrified, and the normally open contacts are closed, so that corresponding switching is performed. Simultaneously, the normally closed contact disconnection of third relay KA3 for first relay KA1 and second relay KA 2's coil can not the circular telegram, has prevented that first relay KA1, second relay KA2 and third relay KA 3's normally open contact is closed simultaneously, makes the operational environment who treats the switching circuit stable equally, and the circuit security is high.

The utility model discloses an introduce fourth relay KA4 and fifth relay KA5 to locate third relay KA 3's coil return circuit with its normally closed contact, make the electric interlocking that has realized three routes relay under the condition that time relay only has two way outputs, thereby realized the electric interlocking of three routes contactor with lower cost, can switch the action steadily, guarantee to treat the steady work and the circuit safety of switching circuit.

In addition, in this embodiment, in one working cycle of the time relay, the first timing switch AL1 and the second timing switch AL2 are configured as follows: the sequence of both open, first timing switch AL1 closed, both open, second timing switch AL2 closed, both open cycles. Thus, each relay follows: the normally open contact of the third relay is closed, the normally open contact of the first relay is closed, the normally open contact of the third relay is closed, the normally open contact of the second relay is closed, and the normally open contact of the third relay is closed, so that the corresponding switching function of the circuit is realized.

Further, since the coil of the ac contactor may be disposed on the normally open contact circuit of the first relay KA1, the second relay KA2, and the third relay KA3, the interlock circuit may be used for a switch in a high current environment.

In a preferred embodiment, the interlock circuit further comprises a manual switch SB1, and the first end is connected to the power supply through a manual switch SB 1. The manual switch SB1 is a button switch, thereby providing an operation interface for operators and ensuring the safety of electricity utilization.

The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.

Claims

1. An interlock circuit having first and second terminals configured as power supply ports and including first, second and third relays for effecting electrical interlock of the three relays; the circuit is characterized by further comprising a time relay, a fourth relay and a fifth relay;

2. The interlock circuit of claim 1, wherein: the coils of the time relay are connected to the first and second terminals.

3. The interlock circuit of claim 1, wherein: the first end or the second end is connected with a power supply through a manual switch.