CN202431562U - Frequency-conversion adjusting device of compressor fan - Google Patents
Frequency-conversion adjusting device of compressor fan Download PDFInfo
- Publication number
- CN202431562U CN202431562U CN2011205604851U CN201120560485U CN202431562U CN 202431562 U CN202431562 U CN 202431562U CN 2011205604851 U CN2011205604851 U CN 2011205604851U CN 201120560485 U CN201120560485 U CN 201120560485U CN 202431562 U CN202431562 U CN 202431562U
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- frequency
- compressor
- adjusting device
- programmable logic
- logic controller
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Abstract
The utility model relates to a frequency-conversion adjusting device of a compressor fan. The frequency-conversion adjusting device comprises a group of motors correspondingly connected with a compressor cooling fan and is characterized in that a programmable logic controller is arranged, an RS-485BD communication adapter is connected onto the programmable logic controller and correspondingly connected with a group of 485PU ports of a frequency changer, each frequency changer is connected with corresponding motor, and frequency conversion and speed regulation of the motors are achieved through an RS-485 half-duplex serial communication between the programmable logic controller and the frequency changer. A compressor temperature transmitter is arranged on a compressor, and the compressor temperature transmitter is connected with an AI module of the programmable logic controller. The frequency-conversion adjusting device has the advantages that the RS-485BD communication adapter is used for controlling, only one communication cable is used for connecting to complete startup, stopping and frequency setting of a plurality of frequency changers, synchronized operation on-line control between the plurality of motors are easy to achieve, cooling effects of the compressors are effectively guaranteed, and a problem of forced air cooling quantity of the compressors is solved.
Description
Technical field:
The utility model relates to the gas compressor field, particularly compressor fan frequency conversion controlling device.
Background technique:
Growing along with Power Electronic Technique and automatic control technology, the speed governing of motor from relay control era development to today by the Frequency Converter Control speed governing.And in industrial every field, obtained using very widely.Traditional compressor blower fan control is controlled the cooling effect that can't guarantee compressor through relay, and the sky is prone to cause compressor circuit ice stifled when cold, can't realize that also the multiple compressors blower fan links the temperature of controlling compressor effectively.In present compressor control system; The most commonly realize the speed regulating control of motor by PLC control frequency variator; The speed governing curve smoothing is continuous, working stability, but actuating cable is longer, when especially the DA module adopts voltage signal output; Circuit has bigger voltage drop, has influenced the stability and the reliability of system.In addition, consider from economic angle, as control many frequency variators, need many DA modules, and this expansion module price is more expensive, so in the mass production of the speed governing of needs control multiple motors, this method is expensive comparatively expensive; The number of frequency variator is more on the one hand, and the distance of motor distribution is inconsistent on the other hand.Adopting the D/A expansion module to do Synchronous motion control receives the fluctuation of analog signals easily and because of the inconsistent influence that decays apart from the inconsistent analog signals that causes, whole system operation stability and reliability is reduced.
The model utility content
The utility model purpose is exactly to the deficiency that exists in the existing technology, a kind of compressor fan frequency conversion controlling device of proposition.
The technological scheme that adopts is:
A kind of compressor fan frequency conversion controlling device; Comprise one group of motor with the corresponding connection of compressor cooling blower; It is characterized in that dress RS-485BD communications adapter on PLC; The corresponding connection of 485PU mouth of communications adapter and one group of frequency variator, each frequency variator and corresponding motor connect, and realize Variable Frequency and Speed Adjusting of Electromotor through the RS485 half-duplex serial communication between PLC and the frequency variator.
On the basis of technique scheme, following further technological scheme can be arranged:
On compressor, be provided with the compressor temperature transmitter, the compressor temperature transmitter links to each other with programmable controller AI module.
The advantage of the utility model is: with RS-485 communication communications adapter control, only connect through a communication cable, just can accomplish many frequency variators startup, stop, frequency setting; And be easy to realize the online control of synchronous operation between many motors, guaranteed the cooling effect of compressor effectively, solve the air-cooled amount problem of compressor.This system advantage: hardware is simple, can realize stepless change, and velocity transformation is level and smooth, and speed controlling is accurate, and adaptive capacity is good.This system cost is low, long distance of signal transmission, strong interference immunity.Especially be fit at a distance many Electric Machine Control.But also have certain deficiency: bigger such as the programing work amount, response has time-delay.
The description of drawings book:
Fig. 1 is the structure principle chart of the utility model.
Embodiment:
A kind of compressor fan frequency conversion controlling device as shown in Figure 1, that the utility model provides, comprise one group with the motor of the corresponding connection of compressor cooling blower (M1-Mn).
The RS-485BD communications adapter is installed on programmable controller PLC; Communications adapter and (the corresponding connection of 1-N) 485PU mouth of one group of frequency variator; Each frequency variator (1-N) with corresponding motor (M1-Mn) connect realizes Variable Frequency and Speed Adjusting of Electromotor through the RS485 half-duplex serial communication between PLC and the frequency variator.
On compressor, be provided with the compressor temperature transmitter, the compressor temperature transmitter links to each other with programmable controller AI module.
Through the given PLC of inputing to is set, through PLC control frequency variator, control motor via frequency variator more again, give PLC with the Temperature Feedback of compressor subsequently, thereby after relatively, export to frequency variator realization astatic velocity modulation.The 485PU mouth communication of logical again RS-485BD communications adapter and frequency variator realizes that many typhoons machine links to regulate the compressor cooling air quantity, reaches the purpose of regulating compressor temperature with this, makes in the system of compressor, controls more accurate to the temperature of compressor.Reach energy conservation and consumption reduction effects simultaneously, more advanced control device is provided.
The utility model is in order to solve the cooling air quantity problem in the conventional piston formula compressor design.The control that makes compressor more rationally, the operation of safety and reliability.Dress RS-485BD communications adapter is connected with the 485PU mouth of frequency variator on PLC, realizes that many typhoons machine links to regulate the compressor cooling air quantity, and when compressor temperature was high, its many typhoons machine full range moved; When compressor temperature was low, according to compressor institute required airflow, dormancy was carried out in adjustment variable-frequency motor frequency or frequency conversion frequently.
Claims (2)
1. compressor fan frequency conversion controlling device; Comprise one group of motor with the corresponding connection of compressor cooling blower; It is characterized in that being provided with a programmable controller, be connected with the RS-485BD communications adapter on the programmable controller, the corresponding connection of 485PU mouth of RS-485BD communications adapter and one group of frequency variator; Each frequency variator connects with corresponding motor, realizes Variable Frequency and Speed Adjusting of Electromotor through the RS485 half-duplex serial communication between programmable controller and the frequency variator.
2. compressor fan frequency conversion controlling device according to claim 1 is characterized in that on compressor, being provided with the compressor temperature transmitter, and the compressor temperature transmitter links to each other with programmable controller AI module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205604851U CN202431562U (en) | 2011-12-29 | 2011-12-29 | Frequency-conversion adjusting device of compressor fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205604851U CN202431562U (en) | 2011-12-29 | 2011-12-29 | Frequency-conversion adjusting device of compressor fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202431562U true CN202431562U (en) | 2012-09-12 |
Family
ID=46781014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205604851U Expired - Lifetime CN202431562U (en) | 2011-12-29 | 2011-12-29 | Frequency-conversion adjusting device of compressor fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202431562U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017024609A1 (en) * | 2015-08-13 | 2017-02-16 | 中山大洋电机股份有限公司 | Multi-motor system and control method thereof, and refrigerator using the multi-motor system and control method thereof |
-
2011
- 2011-12-29 CN CN2011205604851U patent/CN202431562U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017024609A1 (en) * | 2015-08-13 | 2017-02-16 | 中山大洋电机股份有限公司 | Multi-motor system and control method thereof, and refrigerator using the multi-motor system and control method thereof |
| US10396700B2 (en) | 2015-08-13 | 2019-08-27 | Zhongshan Broad-Ocean Motor Co., Ltd. | Multi-motor system, freezer comprising the same, and methods for controlling thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |