CN201097530Y - Greenhouse CO2 computer-controlled system - Google Patents

Abstract

The utility model discloses a greenhouse CO2 computer control system, comprising a CO2 gas source (3), a CO2 transmission controller (2) and a greenhouse (1) which are orderly connected through a gas channel, wherein, a gas pressure transmitter (5) is arranged in the CO2 gas source (3), a gas consistency transmitter (4) is arranged in the greenhouse (1), the gas consistency transmitter (4) and the gas pressure transmitter (5) are respectively connected with a multifunction card (6) through signal lines, a microcomputer (7) is connected with the multifunction card (6) through a data interface to control the CO2 transmission controller (2). The system can determine the volume of CO2 gas which needs to be supplemented before the CO2 gas is supplemented into the greenhouse, and supplement the CO2 gas into the greenhouse with accurate amount, thereby accurately controlling the consistency of the CO2 gas in the greenhouse; while the whole process is finished by automatic control of the computer without human interference, which saves manpower and time.

Description

Greenhouse CO 2Computer control system

Technical field

The utility model relates to CO in the greenhouse ₂The accurate control of concentration especially relates to a kind of greenhouse CO ₂Computer control system.

Background technology

In greenhouse, there is not extraneous CO ₂Under the situation of input, the CO that photosynthesis of plant needs ₂Concentration constantly descends, and in order to keep the photosynthetic rate of tissue cultivating seedling, must replenish CO in greenhouse ₂, and CO ₂Magnitude of recruitment should stablize, accurately.Traditional tonifying Qi mode is that tonifying Qi limit, limit is measured, because CO ₂Fully diffusion needs the regular hour, CO in environment ₂The signal that consistency transmitter is measured in most cases can not be represented CO ₂Actual concentrations after the diffusion evenly.

Summary of the invention

The purpose of this invention is to provide a kind of greenhouse CO ₂Computer control system can be stablized, accurate the be replenished CO in the greenhouse ₂Gas, the photosynthetic rate of maintenance tissue cultivating seedling.

Technical scheme provided by the utility model is achieved in that in order to achieve the above object

It comprises the CO that connects successively by gas passage ₂Gas source, CO ₂Transmission control unit (TCU) and greenhouse, CO ₂Be provided with the gas pressure transmitter in the gas source, be provided with the gas concentration transmitter in the greenhouse, the gas concentration transmitter is connected with multifunction card respectively by holding wire with the gas pressure transmitter, and microcomputer connects multifunction card control CO by data-interface ₂Transmission control unit (TCU).

Described CO ₂Transmission control unit (TCU) comprises built-in power and the intake valve, constant volume container and the air outlet valve that connect successively, and intake valve is by air inlet pipe and CO ₂Gas source connects, and air outlet valve is connected with the greenhouse by escape pipe, and built-in power is connected with air outlet valve with gas concentration transmitter, gas pressure transmitter, intake valve respectively by power line.

The utility model is owing to replenishing CO in the greenhouse ₂CO with regard to determining to replenish before the gas ₂The volume of gas, and with accurate quantity additional CO in the greenhouse ₂Gas, thus CO in the greenhouse accurately controlled ₂The concentration of gas, and whole process is all finished by computer controlled automatic, need not human intervention, has saved manpower and time.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model CO ₂The transmission control unit (TCU) structural representation.

Embodiment

Below in conjunction with embodiment the utility model is described in detail:

Present embodiment comprises by gas passage connection CO successively ₂ Gas source 3, CO ₂Transmission control unit (TCU) 2 and greenhouse 1, CO ₂Be provided with gas pressure transmitter 5 in the gas source 3 in order to monitoring CO ₂The pressure of source of the gas is provided with gas concentration transmitter 4 in order to CO in the monitoring greenhouse in the greenhouse 1 ₂Concentration, gas concentration transmitter 4 is connected with multifunction card 6 circuit respectively by holding wire with gas pressure transmitter 5, microcomputer 7 connects multifunction card 6 by data-interface, multifunction card 6 has that data receive, data latch, data are exported, the integrated circuit of digital-to-analogue conversion (analog-to-digital conversion) function, externally has the data-interface that meets industrial standard, can be connected with microcomputer and carry out exchanges data with it, by air outlet valve control signal wire 15 and intake valve control signal wire 16 control CO ₂Transmission control unit (TCU) 2.

CO ₂Transmission control unit (TCU) 2 comprises built-in power 9 and the intake valve 10, constant volume container 11 and the air outlet valve 12 that connect successively, and intake valve 11 is by air inlet pipe 17 and CO ₂Gas source 3 connects, air outlet valve 12 is connected with greenhouse 1 by escape pipe 14, built-in power 9 is connected with gas concentration transmitter 4, gas pressure transmitter 5 with gas pressure transmitter power line 18 by gas concentration transmitter power line 19, is connected with air outlet valve 12 with intake valve 10 and is located at power interface 8 connections on the housing 13 by power line.Be convenient of the present utility model installing and using, gas pressure transmitter power line 18 and gas concentration transmitter power line 19 form with standard interface can be integrated on the housing 13.

If certain utilizes gas concentration transmitter 4 to detect CO in the greenhouse 1 constantly ₂Gas concentration is ρ 1, if replenish pure CO in greenhouse 1 ₂Gas makes CO in the greenhouse 1 ₂Concentration rise to ρ 2.Known greenhouse 1 air volume is V, CO ₂The air volume of the constant volume container 11 of transmission control unit (TCU) 2 is v, utilizes gas pressure transmitter 5 to detect CO ₂The air pressure of gas source 3 is P (relative barometric pressure), replenishes CO in greenhouse 1 ₂Process as follows:

Microcomputer 7 sends control signal, opens CO ₂The intake valve 10 of transmission control unit (TCU) 2, pure CO ₂Gas promptly enters constant volume container 11, and microcomputer 7 sends control signal and closes intake valve 12 then.Because the general air volume than big and constant volume container 11 of source of the gas air pressure is generally very little, so constant volume container 11 internal gas pressures are slightly less than P, can be approximately P, gas source 3 can think that its pressure is constant after inflating once in constant volume container 11.Microcomputer 7 sends control signal and opens CO ₂The air outlet valve 12 of transmission control unit (TCU) 2, the CO in the constant volume container 11 ₂Just flow to greenhouse 1, can calculate and flow to greenhouse 1 interior gas volume is Pv under normal pressure.Like this, the CO in the greenhouse 1 ₂Concentration raising amount is

$\mathrm{\Δ\ρ}=\frac{\mathrm{Pv}}{\mathrm{Pv}+V}$

In order to make the CO in the greenhouse 1 ₂Concentration rises to ρ 2, and the number of times of above action is repeatedly

$n=\frac{{\mathrm{\ρ}}_2-{\mathrm{\ρ}}_1}{\mathrm{\Δ\ρ}}$

Strictly speaking, CO ₂Each through CO ₂After transmission control unit (TCU) 2 flows into greenhouse 1, CO ₂Air pressure in the gas source 3 all will descend, CO ₂Transmission control unit (TCU) 2 flows to greenhouse 1 interior gas flow at every turn to be reduced gradually.But because gas source air pressure generally very high (high-pressure air source air pressure can reach tens to up to a hundred atmospheric pressure), the gas source gas gross is very big, and requirement is up to ten thousand times of the required additional gas flow in greenhouse.The error that calculates by above formula is often less than the measure error of gas concentration transmitter 4, so can think to calculate by above formula does not have error.

In fact, n is a decimal often, CO ₂The number of times that transmission control unit (TCU) 2 is carried out action can only be an integer.For this reason, with n be rounding to Integer n ', like this will be in the greenhouse gas concentration desired value and replenish between the theoretical value of back and produce error, max value of error is 0.5 Δ ρ.

As seen, in order to reduce to replenish CO ₂CO in the back greenhouse 1 ₂The error of aimed concn and actual concentrations should be selected the constant volume container 11 of less volume for use as far as possible, and the v value of constant volume container 11 is more little, and Δ ρ is just more little, replenishes CO ₂Back concentration error is also more little.At design CO ₂During the constant volume container 11 of transmission control unit (TCU) 2, can be according to CO in the greenhouse 1 ₂Its gas volume is determined in the required precision of concentration, is no more than CO in the group training case with the concentration error that guarantees 0.5 Δ ρ ₂The limits of error of concentration.

Microcomputer 7 operation control programs, control CO ₂The air valve of transmission control unit (TCU) 2 is made corresponding action, finishes to greenhouse 1 and replenishes CO ₂N ' is inferior.CO in greenhouse 1 ₂After the diffusion evenly, CO ₂Concentration should be approached the aimed concn value, and its worst error is no more than 0.5 Δ ρ.

In order to guarantee carrying out smoothly of above process, must write suitable computer program.Computer program should have data acquisition, computational analysis and order output function, and has good man computer interface.During the program operation group is trained CO in the case ₂Concentration is monitored, in case find CO ₂The concentration reduction is just sent corresponding order and is passed through CO ₂Transmission control unit (TCU) 2 replenishes CO in greenhouse 1 ₂CO in the greenhouse ₂The concentration target can be provided with by program interface.

With CO ₂Constant volume container 11 in the transmission control unit (TCU) 2 makes that volume can be regulated and measurable parts, replenishes CO in the time of just can regulating the greenhouse system works ₂Speed and precision.Its volume is transferred when big, and system replenishes CO in greenhouse ₂Speed will accelerate, but precision will descend; When its volume was turned down, system replenished CO in greenhouse ₂Speed will descend, but precision will improve.Must make corresponding change in control software when regulating the volume of constant volume container 11, this change can directly be changed on the program runnable interface and needn't revise in program code.

The utility model adopts the minimum gas compensation process, each CO that only replenishes minute quantity in the greenhouse testing environment ₂Gas adopts the method for repeatedly replenishing when the gas flow that needs in the greenhouse testing environment is big, promptly each inflation only replenishes a fixed percentage of required magnitude of recruitment, every replenishing CO with same percentage in greenhouse again after a period of time ₂, so just can prevent CO ₂Concentration over-standard, but can make CO ₂Concentration is approached to aimed concn always, has guaranteed the accurate conveying of amount of gas, thereby can accurately control CO in the greenhouse testing environment ₂The concentration of gas.

Claims (2)

1, a kind of greenhouse CO ₂Computer control system comprises the CO that connects successively by gas passage ₂Gas source (3), CO ₂Transmission control unit (TCU) (2) and greenhouse (1) is characterized in that CO ₂Be provided with gas pressure transmitter (5) in the gas source (3), be provided with gas concentration transmitter (4) in the greenhouse (1), gas concentration transmitter (4) is connected with multifunction card (6) respectively by holding wire with gas pressure transmitter (5), and microcomputer (7) connects multifunction card (6) control CO by data-interface ₂Transmission control unit (TCU) (2).

2, greenhouse CO according to claim 1 ₂Computer control system is characterized in that, described CO ₂Transmission control unit (TCU) (2) comprises built-in power (9) and the intake valve (10), constant volume container (11) and the air outlet valve (12) that connect successively, and intake valve (10) is by air inlet pipe (17) and CO ₂Gas source (3) connects, and air outlet valve (12) is connected with greenhouse (1) by escape pipe (14), and built-in power (9) is connected with gas concentration transmitter (4), gas pressure transmitter (5), intake valve (10) and air outlet valve (12) respectively by power line.

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