CN101430112A

CN101430112A - Automatic control device for greenhouse hot-water heating

Info

Publication number: CN101430112A
Application number: CNA200810233690XA
Authority: CN
Inventors: 罗小林; 闫聪; 李�杰
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2008-12-08
Filing date: 2008-12-08
Publication date: 2009-05-13

Abstract

The invention provides an automatic hot water heating control device used in a greenhouse, and relates to the automatic hot water heating control device suitable for greenhouse heating. A single-chip microprocessor of a control system controller is electrically connected with a computer, an electric actuator which is connected with a regulating valve and a temperature sensor respectively by data lines, and the controller is internally provided with the single-chip microprocessor, an input keyboard and a display nixie tube. The temperature sensor measures the actual temperature in the greenhouse, the single-chip microcomputer periodically performs data acquisition, program storage, data processing and storage, setting information is input through the keyboard, the data are transmitted and stored in a host computer, a dedicated nixie tube display element displays the preset temperature and the measured temperature, finally, the single-chip microprocessor compares parameters, thus determining actuation direction and actuation time of the electric actuator, regulating the flow of the hot water in the a radiating tube, and automatically regulating the temperature in the greenhouse.

Description

A kind of automatic control device for greenhouse hot-water heating

Technical field

The present invention is a kind of heat supply control device, particularly is applicable to the hot water heating automaton of greenhouse heat supply.

Background technology

The heat-supplying mode that the greenhouse is commonly used is hot-air heating, electrothermal heating, radiant heating and hot water heating at present.Hot air heating system utilizes the principle to air heat, compares with hot water heating, and the indoor temperature field is inhomogeneous, and causes the plant leaf surface dewfall easily; Electrothermal heating utilizes electric current to change electric energy into heat energy by the big conductor of resistance to carry out the heating mode that air or soil are heated, but because power consumption is big, only is applicable to the air heat of growing seedlings and testing isothermal chamber; The radiant heating utilization discharges infrared ray and directly air, soil and plant in the greenhouse is heated, the principle of heating is to be that heat energy raises its surface temperature by transform light energy, and then by convection current and hot the conduction with object and ambient air temperature raising, but equipment requires high, reflector and material behavior thereof are required height, and big to greenhouse side wall radiation loss; Hot water heating makes in the greenhouse by the heat radiation of the heat in the radiator and heats up, so hot-water heating system is more suitable for large greenhouse.Yet the temperature of traditional hot water heating control is the reading that hangs thermometer in the greenhouse by reading, and judges the height of temperature, utilizes the switch of boiler and valve is regulated temperature in the greenhouse, artificial drop into bigger.

Summary of the invention

The purpose of this invention is to provide a kind of hot-water heating system that temperature in the greenhouse is controlled automatically, the user can set in advance according to needed temperature that the greenhouse implants is grown, different plants is preset different temperature, native system just can automatically adjust by pre-set programs, reaches temperature controlled purpose in the greenhouse.

Solving the scheme that technical problem of the present invention adopts is: the single-chip microcomputer of controller is electrically connected with computer, the electric operator that is connected control valve and temperature sensor respectively by data wire, and single-chip microcomputer, input keyboard and demonstration charactron are housed in the controller.

Technology of the present invention also comprises: single-chip microcomputer adopts AT89S52 in described controller, bears procedure stores and data acquisition, data processing, control decision.It is more than two that temperature sensor adopts the quantity of DS18B20 and setting, the temperature data of multiple spot actual measurement is sent to the I/O mouth of single chip computer AT 89S52.Single-chip microcomputer connects electric operator by the TLC5615 D/A conversion unit, and electric operator drives control valve, regulates the hot water flow that flows through radiator, thereby regulates the temperature in the greenhouse.Single-chip microcomputer is sent to host computer with temperature data by the RS-232 bus, and computer shows the temperature parameter curve and analyzes.The single-chip microcomputer of the controller of this device also is connected with the alarm unit of band light emitting diode and buzzer, and when detected temperature was higher or lower than setting range, light emitting diode can glimmer and follow the buzzer sounding alarm.Described control valve is the electric three passes control valve, is installed on the hot water pipeline, can adjust the hot water flow that flows through radiator easily, thereby regulates the temperature in the greenhouse.

The keyboard that comprises a customization in this automaton circuit, keyboard are 3 keys, and its define name is: one " setting key ", one " addend key ", one " subtrahend key ".When the temperature over-range value is set, press once " setting key ", screen will show original capping value, and expression is being provided with the higher limit of temperature at present, at this time, can revise the numeral of screen by " addend key " and " subtrahend key ", press button once, numeral can increase progressively (or successively decreasing) thereupon, does not put if press ﹠ hold, after reaching 3 seconds, the screen numeral will be run fast.After setting higher limit, press " setting key " once more, screen can demonstrate original lower limit, and expression is provided with the lowest temperature value now, subsequently, also is to use " addend key " or " subtrahend key " to revise the numeral of screen.After the lowest temperature value sets up, press " setting " key once more, will withdraw from the state of setting and return normal observing and controlling state, will demonstrate the temperature of current actual measurement on the screen.

When system works, at first target temperature is provided with by keyboard, the charactron display unit, the temperature when being used for temperature range and being provided with shows, so that man-machine interaction, when system carries out work, the temperature information that charactron can display system be gathered in real time.Digital temperature sensor D1, D2, D3 are sent to the temperature data of 3 actual measurements in the I/O mouth of AT89S52; CPU carries out timing acquiring by timer to temperature data, and the temperature data of actual measurement compared direction of action and the actuation time of deciding electric operator according to result relatively with the temperature data that sets in advance, when detected temperature is higher or lower than setting range, LED flash is also followed the buzzer sounding alarm, the control valve hot water amount reduces or increases, the backflow water yield increases or reduces, and when detected temperature was in setting range, the control valve water yield was constant.The hot water flow of radiator is flow through in adjusting, thereby regulates the temperature in the greenhouse.

The invention has the beneficial effects as follows: the indoor temperature field is even, and energy consumption is low, is fit to large greenhouse and uses, and can automatically adjust by pre-set programs, reaches temperature controlled purpose in the greenhouse, reduces manually and drops into.

Description of drawings

The present invention is described further below in conjunction with accompanying drawing and concrete program circuit.

Fig. 1 is control circuit figure of the present invention;

Fig. 2 is a program flow diagram of the present invention;

Fig. 3 is a greenhouse heating control system overall structure schematic diagram of the present invention;

Fig. 4 is a heat supply controller architecture schematic diagram of the present invention;

Fig. 5 is a heat supply controller schematic appearance of the present invention.

Each label is represented successively among the figure: single-chip microcomputer 1, keyboard 2, demonstration charactron 3, alarm unit 4, temperature sensor 5, electric operator 6, charactron demonstration 7, light emitting diode 8, data wire 9, data wire 10,

button

11,12,13, data wire 14, hot-water boiler 15, water pump 16, return pipe 17, water inlet pipe 18, computer 19, controller 20, control valve 21, radiator 22.

The specific embodiment

Comprise three digital temperature sensor D1, D2, D3 in this circuit shown in Figure 1.Its SDATA end links to each other with the P2.0 mouth of single-chip microcomputer (CPU), the VCC termination power, and GND holds ground connection.

This circuit comprises a display unit that shows that charactron 3 is formed, and its each field location control port links to each other with the P0 port of single-chip microcomputer 1.

This circuit comprises the keyboard 2 of a customization, and keyboard 2 is provided with three

buttons

11,12,13, and each port links to each other with P1.0, P1.1, the P1.2 mouth of single-chip microcomputer 1 respectively

This circuit comprises a TLC5615 D/A conversion unit, its DIN, CLK, CS, connects P1.7, P1.6, the P1.5 mouth of single-chip microcomputer 1 respectively, and DOUT termination output data line is to the motorized adjustment valve actuating mechanism.

This circuit comprises a sounding alarm unit 4 of being made up of light emitting diode 8, buzzer, the P2.1 of one termination single-chip microcomputer 1, another termination VCC.

Program flow diagram shown in Figure 2 comprises to be read the preset temperature range parameter, reads temperature sensor data, C.T, and when observed temperature exceeded preset temperature range, the output control signal changed hot water or cold water's flow in the water inlet pipe.

Fig. 3 is greenhouse heating control system figure, and controller 20 of the present invention is directly controlled electric control valve 21, and control valve 21 is directly controlled hot water or cold water's flow of return pipe 17 and water inlet pipe 18.Single-chip microcomputer 1 is sent to computer 19 by the RS232 communication form with data message, and 19 pairs of temperature parameter curves of computer show and analyze.

Fig. 4 is a greenhouse heat supply controller fundamental diagram, single-chip microcomputer 1, bear procedure stores and data acquisition, data processing, control decision, be provided with by 2 pairs of target temperatures of keyboard, temperature sensor 5 is sent to single-chip microcomputer 1 with the temperature data of actual measurement, and shows that in showing charactron 3 luminous, sounding alarm unit 4 links to each other with the I/O mouth of single-chip microcomputer 1, the thermometric degree is not in default parameter area strictly according to the facts, and light emitting diode 8 can glimmer and follow the buzzer sounding alarm.The electric operator 6 of control valve links to each other with the DOUT of TLC5615 end.

Fig. 5 is greenhouse heat supply controller external form figure, charactron shows 7, off-limit alarm diode 8, output data line 9 connects electric control valve 21, image data line 10 connects the SDATA end of temperature sensor 5 (DS18B20), and button 11 is " a subtrahend key ", and button 12 is " an addend key ", button 13 is " setting key ", and communication data line 14 links to each other with the serial ports of host computer 19.

Claims

1, a kind of automatic control device for greenhouse hot-water heating, it is characterized in that: the single-chip microcomputer of controller is electrically connected with computer, the electric operator that is connected control valve and temperature sensor respectively by data wire, and single-chip microcomputer, input keyboard and demonstration charactron are housed in the controller.

2, automatic control device for greenhouse hot-water heating according to claim 1, it is characterized in that: the single-chip microcomputer of controller adopts AT89S52, it is more than two that temperature sensor adopts the quantity of DS18B20 and setting, single-chip microcomputer connects electric operator by the TLC5615 D/A conversion unit, and single-chip microcomputer is sent to host computer with temperature data by the RS-232 bus.

3, automatic control device for greenhouse hot-water heating according to claim 2 is characterized in that: the single-chip microcomputer of controller is connected with the alarm unit of band light emitting diode and buzzer.

4, automatic control device for greenhouse hot-water heating according to claim 3 is characterized in that: the control valve that is installed on the hot water pipeline is the electric three passes control valve.