CN203336766U - Speed control device for outdoor fan of air conditioner - Google Patents

Abstract

The utility model discloses a speed regulation control device for an outdoor fan of an air conditioner, which comprises a drive circuit, a transformer with multi-stage output, a contactor, and a switching control module. The utility model adopts a transformer with multi-stage output, and the output of different levels of the transformer is switched and outputted through a controllable contactor. When working, the switching control module controls and switches the contactor based on the detected working pressure of the air conditioner, so that the fan It can work under different voltages correspondingly, and then can run at the corresponding speed and match the working pressure of the air conditioner. The above-mentioned device has low cost and no influence of electromagnetic noise during operation; compared with chopper step-down speed regulation control, the cost can be reduced, and there is no low-frequency noise; the failure rate is also low.

Description

Air conditioner outdoor fan speed control device

technical field

The utility model relates to the control technology of an outdoor fan of an air conditioner, in particular to a speed regulation control device for an outdoor fan of an air conditioner.

Background technique

Generally speaking, in order to adapt to the requirements of different environmental conditions, the outdoor unit of the air conditioning unit needs to control the speed of the fan when the unit is running at different ambient temperatures to maintain a suitable range of condensing pressure or water temperature. At present, the more commonly used speed regulation methods include stepless regulation and on/off regulation. Stepless regulation is to control the frequency or voltage of the fan through frequency conversion or variable voltage (mainly chopping voltage regulation) to change the speed of the fan to change the air volume. Maintain a stable pressure or water temperature; on/off regulation is to control the on-off of the fan through the pressure controller to maintain a suitable range of pressure or water temperature.

Frequency conversion speed regulation needs to add a frequency converter, which is costly and has electromagnetic noise; while chopper variable voltage speed regulation needs to add a variable voltage speed regulator, its low frequency noise is very large, and it will cause resonance; on/off speed regulation is It is simple and practical to control the fan through the switch type pressure (temperature) controller, but it can only be adjusted by turning on and off the fan, which will cause the system pressure to be unstable.

Contents of the invention

In view of the above problems, the utility model provides a speed regulation control device for an outdoor fan of an air conditioner with reduced cost, no electromagnetic noise, low failure rate and good speed regulation effect.

The technical scheme that the utility model adopts for solving its technical problem is:

The speed control device for the outdoor fan of the air conditioner includes: fan load; a transformer with multi-stage output, the input end of the transformer is connected to the mains power supply circuit; two or more contactors, each contactor includes at least two sets of main Contacts and control coils for controlling the opening and closing states of the main contacts, the input side of the two sets of main contacts is connected to one of the output terminals of the transformer and the ground wire, and the output side is connected to the fan load; the switching control module, the switching The control module includes a control unit and a sensing unit for detecting the working pressure of the air conditioner. The output end of the sensing unit is connected to the input end of the control unit. The control coil is connected.

In a preferred embodiment, the number of contactors is three, including the first contactor, the second contactor and the third contactor, each contactor is provided with a group of normally closed auxiliary contacts, and the control unit includes three control switches The switch is a first control switch, a second control switch and a third control switch, each control switch includes a switch circuit and a trigger end for controlling the opening and closing of the switch circuit, one end of the switch circuit is connected to the mains power supply circuit The other end is used as the output end of the closing and opening signals. The sensing unit has three trigger signal output ends. The sensing unit is respectively connected to the trigger end of the control switch through the trigger signal output ends. One side of the control coil of the first contactor It is connected to one side of the normally closed auxiliary contact of the second contactor, and the other side is connected in parallel with one side of the control coil of the second contactor and one side of the normally closed auxiliary contact of the third contactor, and the second contactor is normally closed. The other side of the closed auxiliary contact is connected to the closing and opening signal output end of the first control switch, the other side of the control coil of the second contactor is connected to the closing and opening signal output end of the second control switching switch, and the third contactor The other side of the normally closed auxiliary contact and one side of the control coil are connected to the ground wire, and the other side of the control coil is connected to the on-off signal output end of the third control switch.

In a preferred embodiment, a master switch is connected in series with the mains power supply circuit.

The beneficial effects of the utility model are: the utility model adopts a transformer with multi-level output, and the outputs of different levels of the transformer are switched and outputted through a controllable contactor. The contactor performs control switching, so that the fan can work at different voltages accordingly, and then can run at the corresponding speed and match the working pressure of the air conditioner. The above-mentioned device has low cost and no influence of electromagnetic noise during operation; compared with chopper step-down speed regulation control, the cost can be reduced, and there is no low-frequency noise; the failure rate is also low.

Description of drawings

Further explanation is carried out below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is a composition diagram of an embodiment of the utility model.

Detailed ways

The main function of the utility model is to automatically change the working voltage of the fan according to the working pressure of the air conditioner, so that the rotating speed of the fan can match the working state of the air conditioner, so as to ensure the stability and normality of the air conditioning system. Specifically, the utility model can control the fan to work at a certain corresponding voltage in different states, and because the voltage is different, the corresponding rotational speed of the fan will change accordingly. Referring to Fig. 1, the device of the present invention includes a fan load 1, a transformer 2 with multi-stage output, a number of contactors 4, a switching control module, etc. Of course, the power supply of the device generally adopts a mains power supply circuit 3.

Wherein, the fan load 1 generally works in parallel, and the number of the fan load 1 is not limited, and it is configured according to the requirements of the system. In this embodiment, the number of fan loads 1 is three. When the voltage changes, the speed of the fan load 1 changes.

The transformer 2 has multi-stage outputs, and its input end is connected to the mains power supply circuit 3 . When working, it converts the mains voltage (generally 220V) and can generate multiple output voltages of different sizes. The output stages of the transformer can be set according to the needs, the more the number, the more switchable output voltages, and the more accurate and precise the control and speed regulation of the fan. In a general embodiment, as shown in FIG. 1 , a transformer including three-level output can meet the requirement of use. Specifically, in the embodiment of FIG. 1 , the transformer 2 has output voltage values of 90V, 160V, and 220V. When the fan operates at the above-mentioned voltage values, it corresponds to the low, medium, and high working pressure states of the air conditioner.

The contactor 4 is arranged between the transformer 2 and the fan load 1 , and is used to respectively control the conduction state of the loop between the output of each stage of the transformer 2 and the drive circuit 1 . The number of contactors 4 is generally the same as the number of output stages of the transformer 2 , and of course, may be less than the number of output stages of the transformer 2 . Each contactor 4 includes at least two sets of main contacts and control coils for controlling the closing and opening states of the main contacts. load connection. This contactor is generally implemented by commonly used equipment. In commonly used equipment, the number of main contacts is generally three groups, and only two groups of them are required for use. Only one of the multiple contactors 4 can be turned on at the same time period, that is, only one output of the transformer 2 is connected to the fan load 1 .

The switching control module is used to control the opening and closing states of all contactors 3 . The switching control module includes a control unit 51 and a sensing unit 52 for detecting the working pressure of the air conditioner. The output end of the sensing unit 52 is connected to the input end of the control unit 51. The output terminal is connected with the control coil of the contactor 4 .

In this embodiment, the number of contactors 4 is three, including a first contactor 41, a second contactor 42 and a third contactor 43, and each contactor 41, 42, 43 is provided with a group of normally closed auxiliary contacts. head. The control unit 51 includes three control switches, which are a first control switch 511 , a second control switch 512 and a third control switch 513 . Each control switch 511 , 512 , 513 includes a switch circuit and a trigger terminal for controlling the opening and closing of the switch circuit. One end of the switch circuit is connected to the mains power supply circuit, and the other end is used as an on/off signal output terminal. The sensing unit 52 is provided with three trigger signal output terminals, and the sensing unit 52 is respectively connected to the trigger terminals of the control switches 511 , 512 , 513 through the trigger signal output terminals. One side A1 of the control coil of the first contactor 41 is connected to one side NC of the normally closed auxiliary contact of the second contactor 42, and the other side A2 is connected to one side A2 of the control coil of the second contactor 42 and the third contact One side NC of the normally closed auxiliary contact of the device 43 is connected in parallel, and the other side NC of the normally closed auxiliary contact of the second contactor 42 is connected with the closing and opening signal output end L1 of the first control switch 511, and the second contactor 42 The other side A1 of the control coil is connected to the on/off signal output end L2 of the second control switch 512, the other side NC of the normally closed auxiliary contact of the third contactor 43 and one side A2 of the control coil are connected to the ground wire, The other side A1 of the control coil is connected to the ON/OFF signal output end L3 of the third control switch 513 .

During operation, the sensing unit 52 detects the working pressure of the air conditioner, and changes the signal at the output end of the trigger signal based on the detected data, so that the switch loop in the corresponding control switch is closed. When the first control switch 511 is closed, the second control switch 512 and the third control switch 513 are opened, the normally closed auxiliary contacts of the second contactor 42 and the third contactor 43 are in the closed state, and the first control switch The on-off signal output terminal of the switch 511 forms a loop along the normally closed auxiliary contact of the second contactor 42, the control coil of the first contactor 41, the normally closed auxiliary contact of the third contactor 43 and the ground wire in sequence, the first The main contact of the contactor 41 is closed, and the main contacts of other contactors are open; similarly, when the second control switch 512 is closed, the first control switch 511 and the third control switch 513 are opened, the second control The on-off signal output terminal of the changeover switch 512 forms a loop along the control coil of the second contactor 42, the normally closed auxiliary contact of the third contactor 43 and the ground wire in sequence, the main contact of the second contactor 42 is closed, and the other contacts The main contact of the switch is disconnected; when the third control switch 513 is closed and the first control switch 511 and the second control switch 512 are opened, the closing and opening signal output terminal of the third control switch 513 passes through the third contactor The control coil of 43 forms a loop with the ground wire, the main contacts of the third contactor 43 are closed, and the main contacts of other contactors are opened. Based on the above working principle, the control device only has one contactor closed at the same time to realize the power supply to the fan load 1 .

In order to make the device work more safely and reliably, a main switch 6 is generally connected in series with the mains power supply circuit 3 .

The implementation of the utility model is not limited by the above-mentioned examples, as long as it achieves the technical effect of the utility model by basically the same means, it should belong to the protection scope of the utility model.

Claims (3)

1. outdoor fan of air-conditioner speed-regulating control device is characterized in that comprising:

Fans load (1);

Transformer (2) with multistage output, the input of transformer (2) is connected with mains-supplied loop (3);

Two or more contactors (4), each contactor (4) comprises at least two group main contacts and the control coil that closes minute state for controlling main contact, the input side of two groups of main contacts is connected with ground wire with a wherein output of transformer (2), and outlet side is connected with fans load (1);

The switching controls module, described switching controls module comprises control module (51) and for detection of the sensing unit (52) of air-conditioning work pressure, the output of sensing unit (52) is connected with the input of control module (51), control module (51) is provided with and closes the sub-signal output, closes the sub-signal output and is connected with the control coil of contactor (4).

2. outdoor fan of air-conditioner speed-regulating control device according to claim 1, the quantity that it is characterized in that contactor (4) is three, comprise the first contactor (41), the second contactor (42) and the 3rd contactor (43), each contactor (41, 42, 43) be provided with one group of normally closed auxiliary contact, control module (51) comprises that three are controlled change-over switch, it is the first control change-over switch (511), second controls change-over switch (512) and the 3rd controls change-over switch (513), each controls change-over switch (511, 512, 513) comprise switch loop and the trigger end opened and closed for the gauge tap loop, one end in switch loop is connected with the mains-supplied loop, the other end is as closing the sub-signal output, sensing unit (52) is provided with three triggering signal outputs, sensing unit (52) by the triggering signal output respectively with control change-over switch (511, 512, 513) trigger end connects, one side of the control coil of the first contactor (41) is connected with a side of the normally closed auxiliary contact of the second contactor (42), one side of one side of the control coil of opposite side and the second contactor (42) and the normally closed auxiliary contact of the 3rd contactor (43) also connects, the opposite side of the normally closed auxiliary contact of the second contactor (42) is connected with the first sub-signal output that closes of controlling change-over switch (511), the opposite side of the second contactor (42) control coil is connected with the second sub-signal output that closes of controlling change-over switch (512), the opposite side of the normally closed auxiliary contact of the 3rd contactor (43) and a side of control coil are connected with ground wire, the opposite side of control coil is connected with the 3rd sub-signal output that closes of controlling change-over switch (513).

3. outdoor fan of air-conditioner speed-regulating control device according to claim 1 and 2, is characterized in that on described mains-supplied loop (3) being serially connected with master switch (6).

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