A kind of central air-conditioning split formula network intelligent temperature controller
Technical field
The present invention relates to a kind of central air-conditioning split formula network intelligent temperature controller.
Background technology
The tail end of central air conditioner temperature controller is the adjustment actuating mechanism of whole building air-conditioner system room environment temperature, generally is divided into control wind, control water or not only controls wind but also control water.No matter adopt which kind of control model, its final purpose is will be with the room environment temperature constant at design temperature, to reach comfortable and energy-conservation effect.Controller architecture generally is comprised of temperature sensor, LCD display, setting parameter button, relay etc., is the field controller of an integral body.
Demand along with information fusion and energy-saving and emission-reduction, temperature controller manufacturer begins the network control technology of Focus Control device, the communication network that adopts mainly contains RS485, CAN, Ethernet etc., wherein bottom communication is take lower-cost RS485 as main, make temperature controller present certain intelligent network, thereby be easy to be integrated in the central air-conditioning centralized monitoring system, realize the Internet of Things of air-conditioning.
Currently marketed main flow temperature controller is mainly the integral type design, namely realizes wind speed control and the switch control of water valve and the network communication of high-end applications etc. of temperature detection, fan coil with an integral part.Its temperature controller structure as shown in Figure 1, generally can be divided into two parts on structure: front and rear panels, header board mainly comprise LCD display, button and governor circuit etc.; Rear plate comprises analog power, relay, binding post etc.Two parts are realized connecting in the temperature controller plastic housing by the multicore winding displacement, as can be seen from Figure 1, the structure of above type temperature controller is monolithic devices, embeds the inner also final integral of mould of plastics after forward and backward plate is connected by inner winding displacement and is placed in the standard terminal box of body of wall.The control of fan coil wind speed and water valve need to be connected to the wiring of correspondence on the binding post of rear plate by the spool threading in the body of wall.
If when engineering project is just built, while cloth AC power supplies, control line and 2 spools of order wire, select above-mentioned integrally-built temperature controller to give no cause for much criticism, but during to the transformation networking project of the three speed switch of original installation or Simple temperature controller, because there is not communication spool (being used for large systems connection), the Party A does not allow to transform again civil engineering---and stringing again, problem has just occurred.Traditional Integral temperature controller wiring is on the binding post of plate behind the temperature controller, wire casing generally is a 4 ' Kbg spool in original body of wall, wants to realize that network control has two problems to realize: 1) 5~6 AC power supplies, the control lines shielding line of communicating by letter with 2 can't pass 4 ' Kbg spool simultaneously; 2) if reduce design standard, use fine line diameter, consider it is unallowed from communication quality and security of system angle, list is considered from the security of system angle, in case order wire has broken skin and AC line overlap joint, whole Remote Monitoring System for Central Air-conditioning will all be paralysed, and consequence is hardly imaginable.Integral temperature controller heavy-current control and power supply (AC220V) all concentrate on temperature controller inside in addition, also easily cause certain potential safety hazard.
Except above structure, the terminal temperature controllers such as the large-scale household air conditioning of part such as U.S. York, McQuay, Trane and domestic Haier, Hisense also adopt split-type design to a certain extent, but its structure is to adopt two cover MCU control systems, be that forward and backward plate respectively has a MCU to communicate contact and control, communication protocol generally adopts I
2The serial mode such as C, SPI, spool wiring are generally 4 (VCC, GND, connection A/B, header board is without independent power supply) or 2 (connection A/B, header board have independent power supply).Rear plate (Execution driven mechanism) is by mode and central air conditioner main machine contacts such as RS485 or CAN buses; Above-described split-type design has following characteristics:
1) front and rear panels line≤4 piece respectively contain a slice MCU, can work alone separately;
2) front and rear panels are passed through I
2The simple and easy serial mode such as C, SPI is finished overall work.
But 2 weak points are arranged during above household air conditioning networking:
1) central air conditioner main machine can only be communicated by letter with rear plate (Execution driven mechanism), can not make many central air conditioner main machines of whole building and all large networkings of fan coil and terminal temperature controller formation;
2) this temperature controller adopts two MCU, nominally for split designs, but cost is higher, is difficult for promoting.
Therefore, it is the Split type temperature controller system that above-mentioned Split type temperature controller defines more accurately, is not being divided into two of single MCU traditional integral temperature controller, and can not consist of the large networking of whole building.
By patent retrieval, find the temperature controller (patent No.: CN200920171726.6) of the split type thought design of the not extensive employing of using on the another kind of market.In this patent specification, this product is divided into panel, drive plate two parts with traditional Integral temperature controller, panel comprises liquid crystal display, base plate, button, and drive plate comprises transformer, relay, binding post etc., and two parts connect by the connecting line with plug.This specification emphasizes that two alignment header boards that drive plate passes through " not polarity " provide work low pressure, transmit panel simultaneously to the control signal of drive plate simultaneously.Just functionally set forth the portion of external physical arrangement in the specification, and by analyzing as can be known: 1) if this patent is realized not polarity, then need intended polarity automatically to detect and reverse circuit; 2) if need to realize the control signal transmission, then be divided into again following two kinds of situations: if adopt wired: control signal must be modulated, on two power lines that then are added to, and survey at drive plate and to carry out demodulation, the processing of control signal; If adopt wireless: can adopt easy radio remote control circuit etc., but wireless signal wants through walls etc., effect is affected.So the simplification in the wiring must cause the complexity on original processing of circuit.By its patent specification, can't find out the realization that it is concrete, to the design without reference value.Simultaneously, by the introduction in the patent specification, learn that it does not contain network communication function, can not realize the large networking of central air-conditioning, and cost is higher, practical value is limited.
Summary of the invention
In order to solve traditional temperature controller in new construction and old deficiency aspect engineered, the invention provides a kind of central air-conditioning split formula network intelligent temperature controller.
For achieving the above object, the present invention's following scheme of sampling:
A kind of central air-conditioning split formula network intelligent temperature controller, it comprises control panel and power panel, described control panel separates with power panel; Described control panel comprises microcontroller, microcontroller respectively with temperature-measuring module, display module is connected with the setting parameter panel, and described microcontroller also is connected with relay control module on the power panel, and the power module on the power panel is relay control module and control panel power supply.
Described control panel is placed in any standard terminal box of body of wall, and major function comprises temperature survey, setting parameter, liquid crystal display and combined network communication etc.
Described power panel is placed near the ceiling fan coil pipe, for control panel provides operating voltage, and the instruction of sending according to control panel, drives air flow relay and or the switching of water valve.
Be equipped with the RJ45 standard socket on described control panel and the power panel, two RJ45 standard sockets connect by netting twine.
Also be provided with the RS485 communication module on the described power panel.
The present invention has adopted single MCU split-type design method to the central air-conditioning network intelligent temperature controller, adopt forceful electric power, light current isolation technics in the design, so that forceful electric power exists only in rear plate (Execution driven mechanism), the part of user's contact only has the safety low-pressure (DC 5V) of front panel, thereby has greatly promoted security.Order wire and DC 5V light current coexist in the netting twine (general adopt surpass the non-shield type of five classes) of a diameter 5.5mm, the smooth phenomenon of the communication that because of forceful electric power the light current electromagnetic interference has been caused when thoroughly having stopped traditional wiring has promoted Systems balanth and reliability.If be applied to new construction, the netting twine of 5.5mm also can be optimized space, saves the extra expenses of 2 pipe wirings.Simultaneously, the design's method only adopts a control chip (MCU), has realized the seamless link of forward and backward plate and Split type central air-conditioner network intelligent temperature controller truly.The expansion the RS485 interface strengthened network savvy, make temperature controller and whole system the operation stability, reliability and communication performance be optimized, and cost near minimum, the design more scientific and reasonable.
Beneficial effect: the present invention adopts header board, rear plate list MCU network-type split-type design, has solved next root installation pipe of conventional situation and has been difficult for temperature controller is incorporated the civil engineering dependence that central air-conditioning is concentrated the disadvantage of (long-range) monitoring system, reduced temperature controller; The network intelligent temperature controller that adopts the split mode to design can utilize existing civil engineering structure to greatest extent, has avoided large-scale engineered; By a netting twine and standardized RJ45 interface, traditional temperature controller is divided into two, realize that strong, weak electricity separates, avoided electromagnetic interference problem that may be potential in the communication; Owing to adopt split type so that strong, weak electricity separates, user side is the DC 5V voltage of safety, guarantees to use safety.Be used for the integrated RS485 interface of network and be directed near the rear plate that is fixed in the blower fan, avoided traditional temperature controller when needing the large networking of system, order wire must be passed the difficulty that causes terminal row the terminal box from body of wall, alleviated the bearing pressure of original spool.By RS485 interface easily, the RS485 hub of supporting special use (being used for expanding the substation) and intermediate station (RS485 turns Ethernet) are easy to system extension to make up the Large Central Air Conditioning System network to thousands of points.The application of this product will thoroughly solve users to be wanted for many years to implement the remote monitoring of central air-conditioning Ethernet and carries out energy-conservationly, can not destroy again the worry of body of wall, has protected original civil engineering structure, has saved unnecessary expenditures.Adopt this split type network intelligent temperature controller, can easily consist of central air-conditioning and concentrate (long-range) monitoring system.Because native system has the new construction cost saving, original old engineering need not transformed civil engineering, remarkable, the benefit advantages such as gain quick return of energy-saving effect, therefore will produce huge economic benefit and social benefit.
Description of drawings:
Fig. 1 is that integral type temperature controller header board and rear plate pass through winding displacement connection diagram in mould;
Fig. 2 is that Split type temperature controller header board of the present invention is by netting twine and at a distance rear plate connection diagram;
Fig. 3 is the Split type temperature controller theory diagram;
Fig. 4 is the forward and backward plate connecting line of the present invention order figure;
Fig. 5 is header board circuit diagram of the present invention;
Fig. 6 is rear plate circuit diagram of the present invention;
Fig. 7 is temperature detecting module theory diagram of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples:
A kind of central air-conditioning split formula network intelligent temperature controller, as shown in Figure 3, it comprises control panel and power panel, described control panel separates with power panel; Described control panel comprises microcontroller, microcontroller respectively with temperature-measuring module, display module is connected with the setting parameter panel, and described microcontroller also is connected with relay control module on the power panel, and the power module on the power panel is relay control module and control panel power supply.
Described control panel is placed in any standard terminal box of body of wall, and major function comprises temperature survey, setting parameter, liquid crystal display and combined network communication etc.
Described power panel is placed near the ceiling fan coil pipe, for control panel provides operating voltage, and the instruction of sending according to control panel, drives air flow relay and or the switching of water valve.
Be equipped with the RJ45 standard socket on described control panel and the power panel, two RJ45 standard sockets connect by netting twine.
Also be provided with the RS485 communication module on the described power panel.
Be illustrated in figure 2 as header board of the present invention (left side) by netting twine and at a distance rear plate (right side) connection diagram, connect by an adjustable length netting twine.At forward and backward plate the RJ45 socket of standard is arranged, the length of netting twine depends on the engineering actual conditions, and general length is 2~5 meters.Network line sequence is set concrete line order such as Fig. 4 by forward and backward plate terminal function correspondence and signal transmission least interference two principle.
Header board RJ45 interface line order is: GND, VCC, H, M, L, Valve, 485B, 485A, and function is as follows separately:
1) GND: rear plate is to power supply ground that header board provides;
2) VCC: the DC 5V power supply that rear plate provides to header board;
3) H: header board backward plate provides high-speed control signal;
4) M: header board backward plate provides the middling speed control signal;
5) L: header board backward plate provides the low speed control signal;
6) Valve: header board backward plate provides the water valve control signal;
7) 485B: header board backward plate provides RS485 communication B end signal;
8) 485A: header board backward plate provides RS485 communication A end signal;
Rear plate RJ45 interface line order is: GND, VCC, H, M, L, Valve, 485B, 485A, and function is as follows separately:
1) GND: provide power supply ground to header board;
2) VCC: provide DC 5V power supply to header board;
3) H: header board backward plate provides high-speed control signal;
4) M: header board backward plate provides the middling speed control signal;
5) L: header board backward plate provides the low speed control signal;
6) Valve: header board backward plate provides the water valve control signal;
7) 485B: header board backward plate provides RS485 communication B end signal;
8) 485A: header board backward plate provides RS485 communication A end signal;
High, medium and low three wind speed of header board and the water valve control signal RJ45 interface by forward and backward plate by network cable transmission to rear plate, plate relay-operated controller circuit after driving, by a netting twine and corresponding interface, just realized the split-type design of temperature controller, the inconvenience of convenient and engineered middle appearance so that the engineering wiring becomes.Because connected mode adopts netting twine commonly used, as long as adopt the line order of the design's regulation, just can conveniently realize the replacement of connecting line, the change of lengthening.
The Split type temperature controller schematic diagram as shown in Figure 3, header board (being control panel) main control chip major function comprises temperature survey, setting parameter, liquid crystal display, RS485 communication etc.; Rear plate (being power panel) is for system provides operating voltage, and the control level that provides according to front panel simultaneously drives the switching of air flow relay and water valve.
The circuit theory of header board wherein mainly comprises as shown in Figure 5:
A) recognition by pressing keys: A1-A6 realizes switching on and shutting down, temperature, pattern, mailing address and baud rate setting etc.;
B) liquid crystal drive shows: adopt the special-purpose segment liquid crystal of central air-conditioning, show in real time the use state;
C) temperature detection: by the method for resistance, capacitor charge and discharge, be 1% thermistor by precision, certainty of measurement is not higher than ± and 1 ℃;
D) network communication: adopt RS485 as the bottom communication network, chip adopts MAX485;
E) extend out excuse: adopt the RJ45 standard socket, be connected with rear board by netting twine, realize relay switch control.
The circuit theory diagrams of rear plate are as shown in Figure 6: wherein mainly comprise:
A) power supply conversion: adopt analog power, civil power is converted to two kinds of dc voltages of 12V, 5V, be respectively rear plate relay, the header board logic control provides working power;
B) Control: by control relay, realize the high, medium and low switching of wind speed, other keep one the tunnel often contain open, the relay (K4) of normally closed point, for expanding air-valve (or water valve);
C) extend out interface: adopt the RJ45 standard socket, be connected with header board by netting twine, realize connected network communication, relay switch control.
General temperature detection, or adopt digital scheme such as 18B20 or adopt the A/D of modeling scheme such as thermistor to sample.When product design, for considering cost, selected a main control chip with the A/D excuse: STC10F08XE.The STC10 series monolithic is the single-chip microcomputer of the single clock/machine cycle (1T) of macrocrystalline science and technology production, high speed, low-power consumption, jamproof 8051 single-chip microcomputers of new generation, instruction system is compatibility 8051 fully, but the fast 8-12 of speed doubly, inner integrated highly reliable reset circuit.
Thermometric realization realizes that by the charge-discharge circuit that precision resistance, thermistor, electric capacity form principle is implemented as follows as shown in Figure 7: P3.6, P3.7 and P3.2 are 3 I/O pin of single-chip microcomputer; RK is the precision resistance of 100K; RT is 100K, and precision is 1% thermistor; R1 is the conventional, electric-resistance of 47 Ω; CN is the Leaded Ceramic Disc Capacitor of 0.1 μ F.
First P3.6, P3.7, P3.2 are made as 0, CN are discharged to discharge.P3.6 is made as 1, T1 conversion time of record P3.2 from 0 to 1.Again P3.6, P3.7, P3.2 are made as 0, CN are discharged to discharge.P3.7 is made as 1, T2 conversion time of record P3.2 from 0 to 1.
According to formula: T1/RK=T2/RT, get RT=T2*RK/T1.The RT temperature curve is non-linear, and temperature characteristics is provided by thermistor manufacturer, has guaranteed correctness and the continuity measured.Adopt lookup table mode, obtain final temperature value.Temperature controller finally records the error of temperature within ± 1 ℃, meets the demands.
In the practical engineering application, header board is placed in the standard terminal box of body of wall, is connected with rear plate by netting twine.The user regulates design temperature, fan speed, operational mode etc. according to self needs; For the management level user, can be by the mode of input password, the parameter that the regulating system communication is relevant is such as address, baud rate, compensation temperature etc.The above-mentioned relevant parameter of domestic consumer's disable access is in case affect the central air conditioner system networking.Rear plate is placed near the ceiling fan coil pipe, is connected with header board by netting twine.Because the Control part is all at rear plate, realized that forceful electric power, light current separate, blower fan three fast taps and water valve are connected the control that can finish wind speed and water valve with corresponding relay terminal, central air-conditioning network communication line is connected just with A, the B two ends of RS485 can realizes the RS485 communication, realize easily the networking of temperature controller.