CN206341160U

CN206341160U - Air-conditioner set compressor start protection circuit

Info

Publication number: CN206341160U
Application number: CN201621469616.4U
Authority: CN
Inventors: 李秀丽; 陈烨; 季宜斌
Original assignee: Mcquay Air Conditioning Refrigeration Suzhou Co Ltd
Current assignee: Mcquay Air Conditioning Refrigeration Suzhou Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2017-07-18
Anticipated expiration: 2026-12-29

Abstract

A kind of air-conditioner set compressor start protection circuit, it is characterised in that：The control loop of circuit is specific as follows：Controller exports the coil for connecing starting relay, the termination power of normally opened contact one of starting relay, the other end is used as node, the node connects the coil of the time relay, normally-closed contact of the node also through the time relay is connected to normally-closed contact one end of triangular form contactor, the coil of the star-like contactor of another termination of the normally-closed contact of triangular form contactor；Normally opened contact of the node also through the time relay is connected to normally-closed contact one end of star-like contactor, the coil of another termination triangular form contactor of the normally-closed contact of star-like contactor；Normally opened contact of the node also through star-like contactor connects the coil of main contactor；Also, the normally opened contact that main contactor is parallel with the normally opened contact of triangular form contactor, the normally opened contact of star-like contactor is parallel with the normally opened contact of the time relay.

Description

Air-conditioner set compressor start protection circuit

Technical field

The utility model belongs to air-conditioner set field, and in particular to a kind of starting protection circuit of air-conditioner set compressor.

Background technology

It is well known that if motor is directly initiated, starting current is up to 4-7 times of rated current, excessive starting current Motor overheating will be caused, electrical machinery life is influenceed, while winding is in the presence of electric power, it may occur that deformation, short circuit is likely to result in And motor is burnt out, but also line voltage can be caused to be remarkably decreased and influence the normal work of other loads on same power network, therefore And, it is necessary to reduced-voltage starting.

Star delta reduced-voltage starting mode, compressor electric motor during startup are generally used for the motor of compressor in air-conditioning unit Winding is connected into star-like, starts and terminates to enter after running status, then the switching of the winding of compressor electric motor is connected into triangular form.Existing skill In art, the major loop of the electric circuit of compressor electric motor is as shown in figure 1, using three contactors：Main contactor KM1, triangular form Contactor KM2 and star-like contactor KM55, realizes that Y starts when KM1 main contacts and KM55 main contacts adhesives, when KM1 main contacts And machine winding is connected into △ completion startups during KM2 main contacts adhesives；And the control loop of the electric circuit of compressor electric motor As shown in Fig. 2 including controller and time relay KT.There is following defect in the control loop of above-mentioned existing electric circuit：

1st, because contactor KM2 and KM55 can not be also turned on, therefore often mechanical interlocked dress is set between KM2 and KM55 Put, still, if mechanical interlocked when using be stuck or time relay KT breaks down, can cause the compressor electric motor can not be by Y types are changed into △, and compressor electric motor is just constantly in the operating of Y types, because compressor electric motor power can not be with dynamic load, compressor Motor can cross cause thermal damage；

2. the direct control contactor KM1 coil adhesives of controller, occur larger temporary impact electric current during adhesive, control is damaged Relay in device processed, influences the controller life-span；

3. time relay KT is easily disconnected by external electromagnetic interference, contactor KM2 coil losing electricities can be caused, cause start/ Failure in running.

The content of the invention

The utility model purpose is to provide a kind of air-conditioner set compressor start protection circuit, to improve reliability, it is to avoid The failure brought by time relay misoperation, and loss of the coil adhesive high current to controller when starting is reduced, prolong Long controller service life.

To reach above-mentioned purpose, the technical solution adopted in the utility model is：A kind of air-conditioner set compressor start protection Circuit, is divided into major loop and control loop two parts, and the component of the circuit includes controller, the time relay of on-delay Device, main contactor, triangular form contactor and star-like contactor；The component of the circuit also includes a starting relay；Institute State control loop specific as follows：The controller output connects the coil of starting relay, the normally opened contact of the starting relay One termination power, the other end is as node, and the node connects the coil of the time relay, and node is also through the time relay Normally-closed contact be connected to normally-closed contact one end of triangular form contactor, another termination of the normally-closed contact of triangular form contactor is star-like The coil of contactor；Normally opened contact of the node also through the time relay is connected to the normally-closed contact one of star-like contactor End, the coil of another termination triangular form contactor of the normally-closed contact of star-like contactor；The node is also through star-like contactor Normally opened contact connects the coil of main contactor；Also, triangular form contactor is parallel with the normally opened contact of the time relay The normally opened contact of main contactor is parallel with normally opened contact, the normally opened contact of the star-like contactor.

Compared with prior art, the utility model has advantages below：

1. it is, as signal transfer, to reduce compression with starting relay KW because controller output meets starting relay KW Loss of the high current to controller, extends controller service life during machine motor start-up procedure coil adhesive；

2. the normally opened contact KM2-2 due to being parallel with triangular form contactor on time relay normally opened contact KT-2, it is to avoid Time relay KT-2 misoperations issuable failures.

Brief description of the drawings

Fig. 1 is the major loop schematic diagram of prior art electric drawings, is also that the master of the utility model embodiment returns simultaneously Road schematic diagram；

Fig. 2 is the control loop schematic diagram of prior art electric drawings；

Fig. 3 is the control loop schematic diagram of the utility model embodiment.

Embodiment

Below in conjunction with the accompanying drawings and embodiment is further described to the utility model：

Embodiment：Referring to shown in Fig. 1 and Fig. 3：

A kind of air-conditioner set compressor start protection circuit, is divided into major loop and control loop two parts.

The component of the circuit includes：Controller, the time relay of on-delay, main contactor, triangular form contactor, Star-like contactor and starting relay.

The major loop of the circuit as shown in figure 1, the motor M of compressor switches on power through main contactor KM1 main contacts, and The motor M of compressor is connected into triangular form by triangular form contactor KM2 main contacts, and star-like contactor KM55 main contacts will be pressed The motor M of contracting machine is connected into star-like.

The control loop of the circuit is described to open as shown in figure 3, controller output meets the coil KW of starting relay The termination powers of normally opened contact KW-1 mono- of motor type relay, the other end connects the line of the time relay as node E, node E KT is enclosed, the node E also normally-closed contact KT-1 through the time relay are connected to the normally-closed contact KM2-1 mono- of triangular form contactor End, the coil KM55 of the normally-closed contact KM2-1 of the triangular form contactor star-like contactor of another termination；The node E is also through institute The normally opened contact KT-2 for stating the time relay is connected to normally-closed contact KM55-1 one end of star-like contactor, star-like contactor it is normally closed The coil KM2 of contact KM55-1 another termination triangular form contactor；Normally opened contacts of the node E also through star-like contactor KM55-2 meets the coil KM1 of main contactor；Also, triangular form contact is parallel with the normally opened contact KT-2 of the time relay The normally opened contact of main contactor is parallel with the normally opened contact KM2-2, the normally opened contact KM55-2 of the star-like contactor of device KM1。

During startup, controller output makes starting relay coil KW obtain electric, closes the normally opened contact KW-1 of starting relay Close, the coil KM55 of star-like contactor is obtained electric, so that the normally opened contact KM55-2 closures of star-like contactor, make main contactor line Circle KM1 obtains electric, so that on major loop, main contacts KM1, KM55 closure, compressor voltage is connected into star-like, realizes star-like open It is dynamic；Meanwhile, time relay coil KT also electric carry out timing.

When main contactor coil KM1 obtains electric, the normally opened contact KM1-1 of main contactor coil is that closure keeps main contactor line That encloses KM1 obtains electricity condition always.

After time relay coil KT preset times are arrived, the normally-closed contact KT-1 of the time relay disconnects, and makes star-like connect The coil KM55 dead electricity of tentaculum, the normally opened contact KT-2 closures of the time relay, makes triangular form contactor coil KM2 obtain electric, and three The normally opened contact KM2-2 closures of angle-style contactor, the normally-closed contact KM2-1 of triangular form contactor, which disconnects, ensures star-like contactor Coil KM55 power-off, so that be now that main contactor coil KM1 and triangular form contactor coil KM2 obtain electric, on major loop, Main contacts KM1, KM2 are closed, by compressor electric motor successful handover into triangular form.

As triangular form contactor coil KM2 once obtaining electric, the normally opened contact KM2-2 of triangular form contactor coil is that closure is protected Hold triangular form contactor coil KM2 always electricity condition, it is to avoid because time relay KT-2 misoperations it is issuable therefore Barrier.

Above-described embodiment is only to illustrate technical concept of the present utility model and feature, and its object is to allow be familiar with technique Personage can understand content of the present utility model and implement according to this, protection domain of the present utility model can not be limited with this. All equivalent change or modifications made according to the utility model Spirit Essence, should all cover protection domain of the present utility model it It is interior.

Claims

1. a kind of air-conditioner set compressor start protection circuit, is divided into major loop and control loop two parts, the member of the circuit Device includes controller, the time relay of on-delay, main contactor, triangular form contactor and star-like contactor；It is special Levy and be：The component of the circuit also includes a starting relay；The control loop is specific as follows：The controller output Connect the coil of starting relay（KW）, the normally opened contact of the starting relay（KW-1）One termination power, the other end is used as knot Point（E）, the node（E）Connect the coil of the time relay（KT）, node（E）Normally-closed contact also through the time relay （KT-1）It is connected to the normally-closed contact of triangular form contactor（KM2-1）One end, the normally-closed contact of triangular form contactor（KM2-1）It is another The coil of the one star-like contactor of termination（KM55）；The node（E）Normally opened contact also through the time relay（KT-2）Connect To the normally-closed contact of star-like contactor（KM55-1）One end, the normally-closed contact of star-like contactor（KM55-1）Another termination triangle The coil of type contactor（KM2）；The node（E）Normally opened contact also through star-like contactor（KM55-2）Connect the line of main contactor Circle（KM1）；Also, the normally opened contact of the time relay（KT-2）On be parallel with the normally opened contact of triangular form contactor （KM2-2）, the normally opened contact of the star-like contactor（KM55-2）On be parallel with the normally opened contact of main contactor（KM1）.