CN201449641U

CN201449641U - Remote prepaid water meter of solar centralized heating system

Info

Publication number: CN201449641U
Application number: CN2009200338101U
Authority: CN
Inventors: 韦军
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-07
Filing date: 2009-07-07
Publication date: 2010-05-05
Anticipated expiration: 2019-07-07

Abstract

The utility model mainly comprises a microcontroller, a TM read/write circuit, a signal acquisition module, a motorized valve control circuit, a voltage detecting circuit, a power supply module, a real-time clock circuit, and an LCD display module. The utility model is characterized in that a mechanical signal of solar standard hot water supply amount is transformed into an electrical signal and transmitted into the microcontroller by a flow measuring module; a corresponding value is taken away from the prestored solar standard hot water supply amount in the TM card by the microcontroller and a water valve is controlled to be open or closed by an EOV (electrically operated valve) driving module, and simultaneously the system is also equipped with auxiliary functional modules such as an LCD display circuit, a voltage detecting module, a real-time clock circuit module and the like. After buying water by payment with a TM card, a user inserts the TM card into a card socket, the microcontroller in the water meter can finish the reading of water buying information instantly, and the water valve is opened for allowing the user to use water. When the left water amount in the card is left with a certain amount and the water valve is closed by the microcontroller and emits alarms, the user can only go on using water by touching the TM card again until the left water amount is used up.

Description

The long-range prepay water meter of a kind of central solar heating system

Technical field:

The utility model relates to solar utilization technique and automatic control technology, is specifically related to the technical field of heat metering in the solar energy system.

Background technology:

In recent years, the relevant departments of country have also issued " national intelligent residential area system's demonstration project construction main points and technological guidance " (tentative original text) and vital documents such as " dwelling house remote meter-reading systems " successively, for the industry development direction of intelligent residential district provides theoretical foundation and has proposed its developing goal: in advanced person's computer technology, the communication technology, on control technology and the IC-card technical foundation, adopt system integration method, progressively set up one and link up inner resident family in sub-district and resident family, resident family and sub-district multi-purpose service centers, resident family and outside social multimedia comprehensive information Internet platform.

But at present in the most of city of China, the construction of intelligent residential district also is in the middle of the planning, and metropolitan intelligent residential district pilots such as Beijing, Shanghai and Guangzhou are also perfect constantly.Particularly the meter reading method of power consumption resource such as water, gas and electricity is entering electronization, intellectuality and digitized epoch.In the former quite a while, the mode that the water, gas and electricity meter reading mode of China city dweller dwelling house is still manually checked meter month by month to the doorstep, not only work efficiency is low, the consumption great deal of labor, but also the opportunity of house robbery is provided for the lawless person.

Along with the development of commercialize housing, the enhancing of housing unit personalization and independence, this energy-dissipation measuring charge method more and more seems incompatible with social development.On the other hand, raising along with progress of science and technology and people's material and cultural life, the progressively enforcement of central solar heating system, then the long-range prepay water meter of central solar heating system become in the solar building integrated design be in indispensable important component part, have crucial development meaning.

Summary of the invention:

The utility model proposes the long-range prepay water meter of a kind of central solar heating system, the DS1961s (TM card) that the main Dallas of use company releases is as the prestore storage medium of water rate of user, design a integrated level height, action accurately, long-range prepay water meter that measuring accuracy is high.As shown in Figure 1, mainly comprise microcontroller, TM card read/write circuit, signal acquisition module, motorized valve control circuit, voltage detecting circuit, power module, real time clock circuit, LCD display module etc.It is characterized in that, the flow detection module is converted into electronic signal with the mechanical signal of sun power standard hot water output, be sent to microcontroller by data acquisition interface, deduct corresponding numerical value in the sun power standard hot water output that prestores of microcontroller from the TM card and pass through the switching that the electrically operated valve driver module is controlled penstock, simultaneity factor also is equipped with subsidiary function modules such as LCD display circuit, voltage detecting, real time clock circuit.Microcontroller is the key control unit of the long-range prepay water meter of TM card, it need finish user's sun power standard hot water output information collection, add up, and circuit sends control signal to the periphery.

The function and the characteristics of each chief component of the present utility model describe:

1 microcontroller

The MSP430 of TI company series monolithic is a kind of mixed signal controller of super low-power consumption, it has 16 risc architectures, 16 registers and the constant generator of CPU make the MSP430 microcontroller can reach the highest code efficiency. and the clock source can make device reach minimum power consumption flexibly. and numerically controlled oscillator (DCO) can make device wake up rapidly from low-power consumption mode, the 16 bit timing devices that are activated into normal working method .MSP430 series monolithic in the time less than 6us are to be applied to Industry Control such as ripple counter, digitalized motor control, ammeter, the desired configuration of water meter and hand-held instrument etc., its built-in hardware multiplier has been strengthened its function greatly, provide software and hardware compatible mutually scope, improved data-handling capacity.

2TM card module for reading and writing

The module for reading and writing of TM card is the key modules that realizes long-range prepay water meter systemic-function.This module hardware line is fewer, only need a data lines to connect micro controller I and DS1961s, when TM card touching read-write deck, corresponding IO mouth is arranged under the interruption of work mode, microcontroller promptly jumps to operational mode from the low-power consumption module, MSP430F149 reads information such as user's water information, remaining sum, existing water price from the TM card by the IO mouth.

Only defined a data lines in the 1-Wire unibus system, so, guarantee that each equipment that drives on the bus at reasonable time is very important.For making aforesaid operations be easy to realize, each device that is connected on the 1-Wire bus must all have an open-drain or ternary port connection data line.The 1-Wire port of DS1961s is an open-drain, and its inner equivalent electrical circuit as shown in Figure 2.Multi-point bus is formed by having connected a plurality of 1-Wire buses from machine equipment.Under standard speed, the maximum rate of 1-Wire bus is 16.3kbps.Under fast mode, speed can reach 142kbps.DS1961s does not guarantee with the iButton standard compatible fully.Its maximum rate is 14.1kbps under the standard speed pattern, 125kbps under fast mode.For execute store under arbitrary velocity and SBA operational order, the 1-Wire pull-up resistor maximal value that DS1961s needs is 2.2k ohm.When communicating by letter simultaneously with several DS1961s, same key for example is installed is given several devices, device from working storage when EEPROM transmits data, should utilize on the Low ESR that is pulled to Upup and draw this resistance of bypass.

The idle condition of 1-Wire bus is a high level.Will recover to communicate by letter as suspending communication because of certain reason, waiting a moment, bus must remain on idle condition.If not so, when bus is in low level state above 16us (fast mode) or 120us (conventional speed), the single or multiple devices on the bus will be reset.When DS1961s was connected on the bus, bus level was that the low time can not be greater than 15.2us, to guarantee not having the slave device to be reset on the bus under the fast mode.Rise when using with the DS2480B1-Wire driver with based on the serial port adapter of this driver chip, except limited flexibility, DS1961s can normally communicate.

3 flow detection modules

As a novel long-range prepay water meter, it must satisfy high-precision requirement, and the effect of flow detection module is very crucial.Consider that existing in the market rotary wind type mechanical water meter technology is very ripe, and Costco Wholesale is lower.Therefore, can on traditional mechanical water meter, install the sensor that can detect fixed solar standard hot water output, sun power standard hot water output information translation is become the electric signal or the form of pulse.Use the oboe sensor in the utility model, have only two tongue tube sensors all to detect pulse information, just think correct sun power standard hot water output signal, it is invalid only to detect individual pulse.The critical point vibration can be effectively solved and the problem of mistaking signal like this, artificial destruction can also be effectively prevented simultaneously.

4 electrically operated valve driver modules

The steady operation of electrically operated valve driving circuit is one of key of long-range prepay water meter design.Because long-range prepay water meter adopts the lithium battery power supply of 3.6V, need long-term work, and consider the bulk factor of long-range prepay water meter, require therefore that motor is must the pressure loss little, volume is little and low in energy consumption.

Therefore, the electrically operated valve driving circuit adopts DC micromotor to drive the scheme of ball valve. and valve actuator adopts the all-metal gear, antiwear property is strong, life-span is long, now by continuous 30,000 times open and close valve gate test, respond well, action is precisely. and the valve that the utility model adopts has two kinds of limit methods, spacing and the mechanical position limitation of switch. mechanical position limitation will lag behind, spacing when malfunctioning when switch, mechanical position limitation just can work. and in the valve operational process, limit switch is in conducting state, when valve put in place, limit switch was in off-state.

Description of drawings:

Fig. 1 is the long-range prepay water meter structural representation of a kind of central solar heating system

Fig. 2 is a TM card module for reading and writing interface schema

Among the figure 1: microprocessor, the 2:1-Wire interface, 3: signal is accepted interface, and 4: the signal transmission interface

Embodiment:

The user hold the TM card pay the fees purchase water after, the TM card is embedded on the deck, the microcontroller moment in the water meter just can be finished and be purchased reading of water information, opens water valve simultaneously and allows user's water.When the residue sun power standard hot water output in the card reaches certain limit, microcontroller cuts out water valve and gives the alarm, the user need touch the TM deck once more could continue water, exhaust Deng residue sun power standard hot water output, water meter is forbidden user's water with automatic-closing valve, and the user need arrive water supply mechanism and supplement with money once more just and can resume water supply.

Claims

1. the long-range prepay water meter of a central solar heating system, mainly comprise microcontroller, TM card read/write circuit, signal acquisition module, motorized valve control circuit, voltage detecting circuit, power module, real time clock circuit, LCD display module, it is characterized in that: the flow detection module is converted into electric signal with the mechanical signal of sun power standard hot water output and delivers to microcontroller, deducts corresponding numerical value and the switching by electrically operated valve driver module control penstock in the sun power standard hot water output that prestores of microcontroller from the TM card.