CN209557311U

CN209557311U - A kind of three-phase draught fan control circuit

Info

Publication number: CN209557311U
Application number: CN201822135624.0U
Authority: CN
Inventors: 李伟
Original assignee: China Automobile Industry Engineering Co Ltd; Scivic Engineering Corp
Current assignee: China Automobile Industry Engineering Co Ltd; Scivic Engineering Corp
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2019-10-29
Anticipated expiration: 2028-12-19

Abstract

The utility model discloses a kind of three-phase draught fan control circuit, including change-over switch SA, and the start-stop button SB1 being connected is controlled on the spot with the change-over switch SA, SB2, the normally-closed contact of the other end connection electrothermal relay KH of stop button SB2, the other end of the normally-closed contact of electrothermal relay KH is connected with the coil of contactor KM1, the normally opened contact of contactor KM1 is connected in parallel on the both ends of button SB1, the other end of button SB2 and one end of rocker switch connect, and the other end of the rocker switch and the control terminal on the spot of change-over switch connect.The utility model uses above technical scheme, so that can be more convenient in control process, it may be implemented to select to be controlled on the case face of control cabinet, also can choose and controlled by switching.

Description

A kind of three-phase draught fan control circuit

Technical field

The utility model relates to air-blower control technical fields, more particularly to a kind of three-phase draught fan control circuit.

Background technique

The control of three-phase blower can generally be controlled on control cabinet case face by button, if control cabinet is not in blower Erecting bed then also needs to install control element on the spot at the scene.Bright dress button box is generallyd use at present is used as control element on the spot, Be inconvenient to control use.

Utility model content

The purpose of this utility model is to be directed to technological deficiency existing in the prior art, and provide a kind of facilitate and operate energy in fact The three-phase draught fan control circuit controlled on the spot with the selection of case face now.

It is for technical solution used by realization the purpose of this utility model:

A kind of three-phase draught fan control circuit, including change-over switch SA, and the control on the spot with the change-over switch SA Hold the normally-closed contact of the other end connection electrothermal relay KH of the start-stop button SB1, SB2, stop button SB2 that are connected, hot relay The other end of the normally-closed contact of device KH is connected with the coil of contactor KM1, and the normally opened contact of contactor KM1 is connected in parallel on button The both ends of SB1, the other end of button SB2 and one end of rocker switch connect, and the other end and the conversion of the rocker switch are opened The connection of control terminal on the spot closed.

The case face control terminal of the rocker switch is connect with breaker, one end phase of the breaker and overload-alarm circuit Connection, the overload-alarm circuit other end are connected with zero curve, and the overload-alarm circuit includes electrothermal relay normally opened contact And intermediate relay KA2 coil, after the electrothermal relay normally opened contact and intermediate relay KA2 coil tandem, with centre after The sequential circuit that electric appliance KA2 normally opened contact connects alarm lamp HL3 is in parallel.

Between the intermediate relay KA2 normally opened contact and the connecting line and zero curve of alarm lamp HL3 joint noise reduction circuit with And bell circuit, the muffling circuit include the coil of intermediate relay KA3 and the coil of the connection intermediate relay KA3 Button SB3, the button SB3 is in parallel with the normally opened contact of intermediate relay KA3, and the bell circuit includes buzzer DL1 and with the normally-closed contact of the buzzer DL1 intermediate relay KA3 connecting, the normally-closed contact of intermediate relay KA3 The other end is connected with the other end of the normally opened contact of intermediate relay KA3 and button SB3.

The both ends of the coil of contactor KM1 are parallel with indicator light HL2.

Compared with prior art, the utility model has the beneficial effects that

The utility model uses above technical scheme, so that can be more convenient in control process, it may be implemented to select It is controlled on the case face of control cabinet, also can choose and controlled by switching.

Detailed description of the invention

Fig. 1 show the structural schematic diagram of the three-phase draught fan control circuit of the utility model；

The scheme of installation for the rocker switch that Fig. 2 is shown.

Specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that this place The specific embodiment of description is only used to explain the utility model, is not used to limit the utility model.

As shown in Figs. 1-2, the three-phase draught fan control circuit of the utility model, comprising:

Change-over switch SA, and the start button SB1 being connected is controlled on the spot with the change-over switch SA, stop pressing Button SB2, stop button SB2 the other end connection electrothermal relay KH normally-closed contact, the normally-closed contact of electrothermal relay KH it is another End is connected with the coil of contactor KM1, and the normally opened contact of contactor KM1 is connected in parallel on the both ends of button SB1, and button SB2's is another One end and one end of rocker switch connect, and the other end of the rocker switch and the control terminal on the spot of change-over switch connect, and connect The both ends of the coil of tentaculum KM1 are parallel with indicator light HL2.

The case face control terminal of the rocker switch is connect with breaker, one end phase of the breaker and overload-alarm circuit Connection, the overload-alarm circuit other end are connected with zero curve (N line), and the overload-alarm circuit includes that electrothermal relay is normally opened After contact and intermediate relay KA2 coil, the electrothermal relay normally opened contact and intermediate relay KA2 coil tandem, in Between relay KA2 normally opened contact connection alarm lamp HL3 sequential circuit it is in parallel.

In the utility model, the change-over switch SA has 3 positions, i.e. case face operating position, stop position and on the spot Operating position.

When change-over switch SA is threaded to case face operating position, start button SB1 is pressed, contactor KM1 is powered, and connection is led back Road, blower starting, control loop pass through the self-sustaining of KM1 auxiliary contact.When pressing stop button SB2, contactor KM1 power-off is broken Major loop is opened, blower stops.

When change-over switch SA is threaded to local operation position, it is closed rocker switch, contactor KM1 is powered, major loop is connected, Blower starting, control loop pass through 100 self-sustaining of rocker switch.Rocker switch 100, contactor KM1 power-off are disconnected, disconnection is led back Road, blower stop.

When electrothermal relay KH1 movement, contactor KM1 power-off disconnects major loop, and blower stops.Simultaneously by alarm bell into Row overload-alarm.

The utility model further includes having power indicating circuit, including the power supply indicator HL1 being located between firewire and zero curve.

Wherein, the change-over switch SA is mounted on control cabinet panel, and the start-stop button SB1, SB2 are also peace On the case face of control cabinet, the rocker switch 100 is mounted on metope 300, and inside is electrical wiring wall box 200.

The working principle of the utility model is as follows:

Change-over switch SA is provided on control cabinet panel, the choosing that the control of case face can be carried out by change-over switch and controlled on the spot It selects.When the start and stop of blower need to be controlled at case face, change-over switch is rotated to case face and controls position, it at this moment can be by case face Start-stop button SB1, SB2 controls blower；Usually when assembling scene controls on the spot, change-over switch need to be rotated To position is controlled on the spot, at this moment blower can be controlled by the rocker switch at scene.

The above is only the preferred embodiment of the utility model, it is noted that for the general of the art For logical technical staff, without departing from the principle of this utility model, several improvements and modifications can also be made, these change It also should be regarded as the protection scope of the utility model into retouching.

Claims

1. a kind of three-phase draught fan control circuit, which is characterized in that including change-over switch SA, and with the change-over switch SA's The normally closed touching of the other end connection electrothermal relay KH for the start-stop button SB1, SB2, stop button SB2 that control terminal is connected on the spot The other end of point, the normally-closed contact of electrothermal relay KH is connected with the coil of contactor KM1, and the normally opened contact of contactor KM1 is simultaneously The both ends of button SB1 are associated in, the other end of button SB2 and one end of rocker switch connect, the other end of the rocker switch It is connect with the control terminal on the spot of change-over switch.

2. three-phase draught fan control circuit as described in claim 1, which is characterized in that the case face control terminal of the rocker switch with Breaker connection, the breaker are connected with one end of overload-alarm circuit, the overload-alarm circuit other end and zero curve It is connected, the overload-alarm circuit includes electrothermal relay normally opened contact and intermediate relay KA2 coil, the electrothermal relay After normally opened contact and intermediate relay KA2 coil tandem, the concatenation of alarm lamp HL3 is connect with intermediate relay KA2 normally opened contact Circuit in parallel.

3. three-phase draught fan control circuit as claimed in claim 2, which is characterized in that the intermediate relay KA2 normally opened contact Joint noise reduction circuit and bell circuit between the connecting line and zero curve of alarm lamp HL3, the muffling circuit include it is intermediate after The button SB3, the button SB3 of the coil of the coil and connection intermediate relay KA3 of electric appliance KA3 and intermediate relay The normally opened contact of device KA3 is in parallel, the bell circuit include buzzer DL1 and the centre being connect with the buzzer DL1 after The normally opened contact of the normally-closed contact of electric appliance KA3, the other end of the normally-closed contact of intermediate relay KA3 and intermediate relay KA3 with And the other end of button SB3 is connected.

4. three-phase draught fan control circuit as claimed in claim 3, which is characterized in that the both ends of the coil of contactor KM1 are in parallel There is indicator light HL2.