CN2708152Y

CN2708152Y - Frequency changing precision air-conditioner

Info

Publication number: CN2708152Y
Application number: CN 200420044663
Authority: CN
Inventors: 方沛明
Original assignee: GUANGDA REFRIGERATING CO Ltd DONGGUAN
Current assignee: Guangdong Liyou Thermal System Co., Ltd.
Priority date: 2004-04-13
Filing date: 2004-04-13
Publication date: 2005-07-06
Anticipated expiration: 2014-04-13

Abstract

The utility model belongs to the field of a precise air conditioning system with constant temperature and humidity. The utility model solves the problems that the precise air conditioner with fixed frequency and constant temperature and humidity has the disadvantages of large energy consumption and low control precision. In the course that the technical problems are solved, a variable frequency compressor, a high precise sensor with temperature and humidity, a DDC micro computer controlling system and PID arithmetic (proportion, differentiation and integral) controlled on the basis of the value of air enthalpy are adopted in the utility model. By comparing the enthalpy value of a controlled environment and the enthalpy value set by a user in DDC (corresponding to the specific set value of temperature and humidity), a PID value is obtained and is then converted to a physical signal of from 0V to 10V, from 2V to 10V or from 4mA to 20mA. The signal is used for driving the frequency output of a converter, accordingly, the power output of the compressor is controlled, and synchronously, the PID control arithmetic is adopted for heating control and humidification control. The utility model changes the mode that the temperature and the humidity are respectively independently controlled for improving efficiency and control precision.

Description

The frequency conversion precision air conditioner

Technical field

The utility model relates to conditioner, more particularly, relates to a kind of central air conditioner system, more particularly, relates to the constant temperature and humidity air-conditioning system that adopts frequency-changeable compressor.

Background technology

In existing business air conditioner field, the refrigerating capacity of precision air conditioner unit that carries the refrigerant system is generally between 20KW to 250KW, and heating capacity is between 10KW to 120KW.Compressor, the evaporimeter of one or more small-sized customization cold are housed, condenser, throttling arrangement, heater, humidifier, supply air system and air cleaner etc. in the precision air conditioner equipment of a compact conformation.In control, carry out the control of refrigerating capacity and dehumidifying by the operation quantity of control compressor.Its control curve is a kind of curve of stepped change, is not a kind of curve of slyness.Therefore the loss of energy is bigger, and control accuracy is also not high enough.

The utility model content

The purpose of this utility model is, a kind of precision air conditioner that adopts frequency-changeable compressor is provided, and can overcome the existing above-mentioned shortcoming of existing precision air conditioner system, realizes the step-less adjustment of energy in the precision air conditioner system; Realize than adopting invariable frequency compressor to save the energy and more high-precision control greatly.

The utility model adopts following technical scheme to realize: construct a kind of precision air conditioner system, what comprise connection in regular turn is frequency-changeable compressor, with the suitable evaporimeter of compressor, heating PTC, humidifier, device for drying and filtering, blower fan, expansion valve, condenser, screen pack, sensor and control module, also comprise the DDC controller, the output interface of this DDC controller links to each other with the frequency converter of described precision air conditioner system, described sensor and control module come out the humiture of controlled environment and signal are sent to the DDC controller by sensor sensing, the user compares calculating from the enthalpy of the humiture correspondence of establishing by enthalpy difference in the enthalpy of the humiture correspondence that the DDC controller is sensed Temperature Humidity Sensor and the DDC controller, the PID analog control signal of a 0～10V of output is given the frequency converter of frequency-changeable compressor, control the frequency of frequency-changeable compressor by frequency converter, thereby reached the purpose of control refrigeration and dehumidifying.

In above-mentioned air-conditioning system, the humiture of controlled environment can be come out by sensor sensing and signal is sent to DDC (programmable digital self-operated controller) controller.The user sets in the DDC temperature, humidity and control accuracy requirement.The unique enthalpy all corresponding according to each humiture.The user compares calculating from the enthalpy of the humiture correspondence of establishing by enthalpy difference in the enthalpy of the humiture correspondence that Temperature Humidity Sensor is sensed and the DDC, exports this value scope 0～10V of a PID analog signal (PID value) or the magnitude of voltage of 2～10V or the current value of 4～20mA.Calculation diagram is as follows.

By the enthalpy difference computing method, refrigeration system is controlled by temperature or humidity no longer separately, but the enthalpy difference that combined by humiture is controlled.Enthalpy difference hour, system only need start heat temperature raising and fall wet and little cold refrigeration and can satisfy environmental requirement.Avoid a large amount of cooling dehumidifier and a large amount of heat temperature raisings, thereby saved energy consumption; When enthalpy difference was big, refrigeration system was given frequency converter according to the signal of the controlling value 0～10V of DDC output, changed the frequency of compressor by frequency converter, can realize the step-less adjustment of energy, and than adopting invariable frequency compressor to save the energy greatly.The loss that has promptly reduced energy improves the control accuracy of precision air conditioner again.

In the utility model, the DDC controller of the PID account form of employing, employing be frequency-changeable compressor, can realize the step-less adjustment of adjustable range, the loss of the energy in the time of can overcoming stepped change and the not high problem of control accuracy from [0～130%].In addition, because the efficient height of frequency-changeable compressor when the slow-speed of revolution, therefore in enthalpy difference hour, the saving effect of energy is more obvious.

The utility model has the advantages that: the utility model adopts advanced DDC control hardware in conjunction with PID (ratio, integration, differential) enthalpy difference algorithm and more energy-conservation frequency-changeable compressor.Give the frequency converter of frequency-changeable compressor by calculating the output pid value, thus the rotating speed of control frequency-changeable compressor.The control problem that has solved frequency conversion precision air conditioner control system can be alleviated simultaneously the big problem of present precision air conditioner energy consumption again, has not only improved control accuracy but also has reduced the energy consumption of unit.

Description of drawings

Fig. 1 is the control principle block diagram of the utility model module precision air conditioner;

Fig. 2 is the utility model unit electrical schematic diagram.

The specific embodiment

With reference to Fig. 1, Fig. 2,, this VFC precision air conditioner system is by the frequency-changeable compressor that connects in regular turn, oil eliminator, blower fan (band motor), condenser, device for drying and filtering, expansion valve magnetic valve, capillary, evaporimeter, electrical heating PTC, humidifier, hydraulic accumulator connects and composes.Be provided with the control device that is made of control module and DDC controller in system, the DDC controller is an existing equipment, can order as required, and compressor shown in the figure is frequency-changeable compressor (attaching has frequency converter)

Wherein the humidification amount of humidifier size and start-stop are by the humidity control of controlled chamber; The unlatching of heater is by the temperature control of controlled chamber; The unlatching of compressor and operating frequency are by the enthalpy control of controlled chamber humiture correspondence.Adopt the refrigerating circuit that frequency-changeable compressor forms+organize electrode humidifler of electrical heating PTC+ more, the control of air-conditioning system on, the humiture of controlled environment is come out by sensor sensing and signal is sent to DDC (programmable digital self-operated controller) controller.The user sets in the DDC temperature, humidity and control accuracy requirement.The unique enthalpy all corresponding according to each humiture.The user compares calculating from the enthalpy of the humiture correspondence of establishing by enthalpy difference in the enthalpy of the humiture correspondence that Temperature Humidity Sensor is sensed and the DDC, exports this value scope 0～10V of a PID controlling value (PID value) or the magnitude of voltage of 2～10V or the current value of 4～20mA.Calculation diagram is as follows.

By the enthalpy difference computing method, refrigeration system is controlled by temperature or humidity no longer separately, but the enthalpy difference that humiture combines is controlled.Enthalpy difference hour, system only need start heat temperature raising and fall wet and little cold refrigeration and can satisfy environmental requirement.Avoid a large amount of cooling dehumidifier and a large amount of heat temperature raisings, thereby saved energy consumption; When enthalpy difference was big, refrigeration system was given frequency converter according to the controlling value of DDC output, thereby realized the startup of frequency-changeable compressor and the change of frequency, thereby realized the input as required of stepless, not only improved control accuracy but also reduced energy consumption.

Claims

1, a kind of precision air conditioner system that has adopted frequency-changeable compressor and DDC control, comprise the frequency-changeable compressor that connects in regular turn, with the suitable oil eliminator of compressor, blower fan, condenser, device for drying and filtering, expansion valve, screen pack, evaporimeter, heating PTC, humidifier, magnetic valve, hydraulic accumulator, sensor and control module, also comprise the DDC controller, it is characterized in that, the output interface of this DDC controller is connected with the DDC controller binding post of described control module, described sensing and control module come out the humiture of controlled environment and signal are sent to the DDC controller by sensor sensing, the user compares calculating from the enthalpy of the humiture correspondence of establishing by enthalpy difference in the enthalpy of the humiture correspondence that the DCC controller is sensed Temperature Humidity Sensor and the DDC controller, export the voltage signal of PID controlling value corresponding physical signal a 0～10V or 2～10V or the current value of 4～20mA and give frequency converter, the power output of Frequency Converter Control compressor, thereby the work of control air-conditioning system.

2, according to the described precision air conditioner system that has adopted frequency-changeable compressor and DDC control of claim 1, it is characterized in that, be provided with frequency-changeable compressor in this air-conditioning system.

According to the described frequency conversion precision air conditioner of claims 1 system, it is characterized in that 3, the frequency-changeable compressor that is provided with combines with DDC control, by the DDC signal is passed to the frequency that frequency converter is controlled compressor.