A kind of source pump frequency modulation point control methodTechnical field
The present invention relates to art of heat pumps, especially a kind of source pump frequency modulation point control method.
Background technology
Frequency conversion heat pump system is the hot-cool demand according to user, by changing the frequency of supply of drive motor for compressor, is changedBecome cooling system agent flux, so as to realize that the cooling/heating amount of heat pump is matched with the cold heat load of user.
The energy consumption of air conditioner refrigerating is continuously increased always, and energy supply is very nervous, and people are required to indoor comfort in additionMore and more higher, also just promotes the extensive application and the continuous development of frequency conversion heat pump technology of frequency conversion heat pump product.
Often occurs situations below when conventional frequency conversion heat pump is run at some frequencies：
1st, the resonance of unit inner components can be caused, is caused unit noise big, not only be have impact on our daily life,And certain loss of unit inner components can be caused；
2nd, frequency-changeable compressor can be caused to send ear-piercing shriek, has had a strong impact on our daily life.
Prior art controls frequency-modulating process by complicated process, and high cost is difficult in maintenance, and technical difficulty is big.
The content of the invention
In order to solve above-mentioned technical problem, the purpose of the present invention is：One kind is provided and avoids frequency conversion heat pump unit internal resonanceAnd the frequency modulation point control method of frequency-changeable compressor cacophony.
The technical solution adopted in the present invention is：A kind of source pump frequency modulation point control method, includes following steps：
A, in the controller input cause the frequency range of generating set resonant vibration and compressor shriek；
B, controller detect the turnover coolant-temperature gage of unit by Inlet and outlet water temperature-sensitive head, and calculate the output frequency of unit；
C, when output frequency is more than minimum frequency in step A medium frequency scope, controller by the value of output frequency fromFrequency converter is transmitted further to after dynamic tax is little；When output frequency is less than the peak frequency in step A medium frequency scope, controller will be defeatedFrequency converter is transmitted further to after the automatic tax greatly of value for going out frequency；
D, frequency converter are exported according to the output frequency for receiving and carry out corresponding raising frequency or down conversion process to compressor.
Further, in step C, controller output frequency is assigned automatically it is little after value be less than step A medium frequency scopeMinimum of a value.
Further, in step C, the value after output frequency is assigned greatly by controller automatically is more than step A medium frequency scopeMaximum.
Further, in step B, controller goes out the output frequency of unit according to Inlet and outlet water differential thermal calculation.
Further, in step C, output frequency is transferred to frequency converter by RS485 holding wires by the controller.
The invention has the beneficial effects as follows：Because for frequency conversion heat pump unit, it is one which causes resonance and the frequency screamedIt is fixed, therefore need the frequency range evaded by being first input into the part in the controller, controller further according to output frequency withSaid frequencies scope is contrasted, and then the value of output frequency is carried out assigning greatly or is transmitted further to frequency converter after tax is little, its controlMethod is simple, and stability is high, the low cost realized, and efficiently avoid that resonance and shriek occurs in unit canCan, reduce unit noise and the impact to daily life.
Description of the drawings
The step of Fig. 1 is the inventive method flow chart.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further：
With reference to Fig. 1, a kind of source pump frequency modulation point control method includes following steps：
A, in the controller input cause the frequency range of generating set resonant vibration and compressor shriek；
B, controller detect the turnover coolant-temperature gage of unit by Inlet and outlet water temperature-sensitive head, and calculate the output frequency of unit；
C, when output frequency is more than minimum frequency in step A medium frequency scope, controller by the value of output frequency fromFrequency converter is transmitted further to after dynamic tax is little；When output frequency is less than the peak frequency in step A medium frequency scope, controller will be defeatedFrequency converter is transmitted further to after the automatic tax greatly of value for going out frequency；
D, frequency converter are exported according to the output frequency for receiving and carry out corresponding raising frequency or down conversion process to compressor.
Be further used as preferred embodiment, in step C, controller output frequency is assigned automatically it is little after value it is littleIn the minimum of a value of step A medium frequency scope.
It is further used as preferred embodiment, in step C, the value after output frequency is assigned greatly by controller automatically is bigIn the maximum of step A medium frequency scope.
Frequency values are made after automatic assignment less than the minimum of a value of step A medium frequency scope or more than step A medium frequency scopeMaximum, it is ensured that the scope of output frequency value is not in step in frequency range, therefore avoids frequency-changeable compressor altogetherVibration frequency works, and it also avoid frequency-changeable compressor and is operated in resonant frequency in conversion process.
It is further used as preferred embodiment, in step B, controller goes out unit according to Inlet and outlet water differential thermal calculationOutput frequency.
It is further used as preferred embodiment, in step C, the controller will be exported by RS485 holding wiresFrequency is transferred to frequency converter.
It is more than that the preferable enforcement to the present invention is illustrated, but the invention is not limited to the enforcementExample, those of ordinary skill in the art on the premise of without prejudice to spirit of the invention can also be made a variety of equivalents or be replacedChange, the deformation or replacement of these equivalents are all contained in the application claim limited range.