CN2781335Y - Electronic household gas meter - Google Patents

Abstract

The utility model discloses an electronic household gas meter. A housing is provided with a display panel, a control circuit and a venting pipeline is arranged inside the housing, wherein both ends of the venting pipeline are respectively provided with a charging joint and a discharging joint, and the middle of the venting pipeline is provided with a sensor; the sensor is a heat type flowrate sensor; besides, the control circuit comprises a constant current source, an amplification module, an A/D conversion module, a data processing module, an output module, a display and an input module. The household gas meter has the advantages of simple mechanical structure, simple manufacture technology, small volume and low manufacture cost. Because of diversity and strong functions of electronic circuits, the utility model has multiple actualization methods and can meet the needs of various measuring ranges and guarantee measuring accuracy; the utility model can particularly raise the sensitivity of small range measurement and has high response speed and low power consumption, and the utility model approaches zero initial measurement; moreover, the utility model can achieve a plurality of additional functions.

Description

A kind of electronic domestic gas meter

Technical field

The utility model relates to a kind of domestic gas meter, specifically a kind of electronic domestic gas meter.

Background technology

At present, known domestic gas meter has IC-card gas meter, flow meter, diaphragm gas meter, direct-reading gas meter, flow meter, remote transmitting gas meter, IC-card family expenses diaphragm gas meter several, these several gas meter, flow meters all are to utilize the membrane type principle, by mechanical metering structure, by photoelectricity or Hall element the flow of combustion gas is converted to electric signal input unit sheet and measures.With reference to Fig. 1, have cavity 35 and 36,38 and airbag cover 33 of two essentially identical standard air bags of volume in its shell 34, main airway 31 is by valve 32 and described cavity 35 UNICOMs, described airbag cover 33 is coupling above described standard air bag 36,38, which is provided with an air intake opening 41 and makes described cavity 35 select a conducting with described two standard air bags 36,38; Respectively by door 37,29 and interior pipe 40 UNICOMs, described interior pipe 40 is connected to user's tracheae 42 on described two standard air bags 36,38; Mechanical counter 44 is by train 43 and described airbag cover 33 interlocks.The principle of work of above-mentioned membrane type domestic gas meter is: after gas enters domestic gas meter cavity 35 from main airway 21 by valve 32, enter one of them air bag by the air intake opening on the airbag cover 41, for example left air bag 38, at this moment, the left valve 39 on the left air bag is closed; Behind left air bag 38 gassies, thereby airbag cover 33 produces rotation under the effect of air pressure transfer and right air bag 36 conductings the air intake opening 41 on it, valve 39 on the air bag 38 of a left side is opened and 40 conductings of described interior pipe, and gas flow into user's tracheae 42 by interior pipe 40.Meanwhile, the gas in the cavity 35 enters into right air bag 36 by air intake opening 41, and at this moment, the right valve 37 on the right air bag is closed; Behind right air bag 36 gassies, thereby airbag cover 33 produces rotation under the effect of air pressure transfer and left air bag 38 conductings the air intake opening 41 on it, valve 37 on the right air bag 36 is opened and 40 conductings of described interior pipe, and gas flow into user's tracheae 42 by interior pipe 40., so moving in circles, left and right air bag hockets and inflates and gas transmission, because when gas transmission, the cavity of this air bag and domestic gas meter is isolated, thereby guarantees that the volume of each output gas is the volume of air bag.Whenever finish a change action, the rotating band driving wheel of airbag cover 33 system rotates, and the dial rotation of driving device counter 44 once determines to export the capacity of gas by calculating number of times that air bag switches and the product of the volume of standard air bag.The parts of above-mentioned mechanical gas table are a lot of, and physical construction is very complicated, and the manufacturing process difficulty is very big, and manufacturing cost is higher relatively.And,, influenced the precision of measuring because the limitation of mechanical realization makes traditional mechanical gas table insensitive to the tiny flow quantity reaction.In addition, traditional mechanical type gas meter volume is bigger, and is compatible relatively poor, brings inconvenience for the installation and the measurement of user and gas company.

Summary of the invention

To be solved in the utility model is the problems referred to above that existing domestic gas meter exists, and a kind of electronic domestic gas meter of novelty is provided, and is intended to simplify product structure, improves measuring accuracy, reduces manufacturing cost, reduces small product size.The technical scheme that addresses the above problem employing is: a kind of electronic domestic gas meter, comprise shell, described shell is provided with display panel, be provided with control circuit and breather line in the shell, the two ends of described breather line are provided with inlet suction port and air outlet adapter, the centre is provided with sensor, and described sensor is a thermal flow rate sensor, and described control circuit comprises:

The heater strip of the described thermal flow rate sensor of _ _ give provides the constant current source of steady current;

The amplification module that the aanalogvoltage difference signal of _ _ described sensor is exported amplifies;

_ _ sampling after the described amplification signal and convert it into the A/D modular converter of digital signal;

The control signal that the data that _ _ to the A/D modular converter transforms carry out computing and storage, receive load module simultaneously handles that back output shows and/or the data processing module of control signal;

_ _ receive the demonstration and/or the control signal of data processing module output provides the output module of output interface to output device;

_ _ the signal of output module output the is converted into display of flow and correlation parameter;

_ _ the provide load module of input interface to input equipment.

Electronic domestic gas meter of the present utility model, adopt thermal flow rate sensor, by electronic control circuit the aanalogvoltage difference signal of sensor output is amplified, after a series of processing such as A/D conversion, computing storage and output, reads by display at last.Thereby compare with traditional mechanical type domestic gas meter, domestic gas meter of the present utility model, its physical construction and manufacturing process are very simple, and volume is much smaller, and manufacturing cost reduces greatly.Simultaneously, because the diversity and the power of electronic circuit, make that implementation of the present utility model is a lot, not only each functional module can adopt different circuit to realize, and, also can combine between two or more adjacent functional modules and realize with the multifunction module of a maturation.And, by inserting different input equipments, perhaps output to different output devices, perhaps export to different executive components, can satisfy the needs of various range kinds, guarantee measuring accuracy by control module, especially can improve the sensitivity of journey measurement in a small amount, and response speed is fast, and is low in energy consumption, measures near zero initiating; Simultaneously can realize additional functions, as warning function, the card-reading function of IC-card, infrared meter reading function, the solenoid control function etc. of supplying gas.

Electronic domestic gas meter of the present utility model is applicable to coal gas and rock gas.

As everyone knows, along with the natural gas applications of China has entered a peak period, continue " after the West-east Gas, " Russia send in gas south ", " river gas goes out the river ", " southern gas disembarkation " and " eastern gas east is sent " engineering all go into operation in succession, for the development of natural gas meter provides vast market.At present, the transfering natural gas from the west to the east eastern section keeps the safety and steady operation always, and to Henan, Anhui, Soviet Union, Zhejiang, Hu Si province one city, 20 tame user's air feed, the accumulative total air demand breaks through 5 billion cubic meters.Also measurable, rock gas all can be used in landlocked each province of China soon, and rock gas also will replace coal gas and enter huge numbers of families.

Known membrane type natural gas in home table, unit price is 350 yuan, the cost height; Measuring error is between 1.5% to 3%; And have that poor compatibility, susceptibility, security of system are not high, cost is high, volume is big, use is inconvenient, short or the like the deficiency of life of product.Simultaneously in a sense, flow metering accurately, be directly connected to China at present just emphasis carry out " success of West-east Gas engineering construction also is directly connected to the interests of resident and gas company.

Electronic domestic gas meter of the present utility model is a kind of micro electronmechanical hot-type domestic gas meter, flow meter, can accurately measure gas flow.This gas meter, flow meter is made up of the metering mechanism of full electronic, by the thermal mass flow sensor flow of combustion gas is converted to voltage signal, and the input single-chip microcomputer measures.This gas meter, flow meter can not only be measured tiny flow quantity, and response speed is fast, highly sensitive, low in energy consumption, range ability is wide, approaching zero initiating is measured, performances such as volume is little, appearance looks elegant.

In following 2 years, the consumption of domestic gas meter just will increase about 300,000, calculates with 350 yuan/platform of present epithelium formula domestic gas meter comprehensive unit price, and 100,000,000 500 ten thousand yuans market capacity will be arranged.And along with the increase of output, its price also can be than traditional stem-winder considerably cheaper.Simultaneously, along with " all completion in succession of series engineering is waited in West-east Gas, " Russia send in gas south ", " river gas goes out the river ", " southern gas disembarkation " and " eastern gas east is sent " a moment, and the market capacity of natural gas in home table will enlarge rapidly, and its commercial promise is limitless.

As further improvement of the utility model, described output module is provided with infrared output interface, and infrared emission and receiver module are connected to described infrared output interface.Like this, gas company can read user's gas consumption from this infrared output interface by infrared meter reading device, improved the degree of accuracy of meter reading, can avoid the manual personal error and the mistake of checking meter and to cause, data have been stored, handled and manage but also help gas company.

Further improve as the utility model, the output terminal of described data processing module also is provided with the control module that the control signal of described data processing module output is converted into steering order again.The output terminal of described control module is provided with warning device and/or solenoid valve interface.Described warning device can be buzzer circuit.When user's gas consumption exceeds standard, when perhaps the battery of domestic gas meter was lower than setting value, hummer sent chimes of doom, and the prompting user buys new gas consumption, the battery that perhaps more renews as early as possible.

Described control module can also be provided with the driving circuit of a solenoid valve, is provided with solenoid valve in the described breather line.When user's gas consumption exceeded its purchase volume, control module output control signal was ordered about the closed electromagnetic valve breather line by driving circuit.

Further improve as the utility model, described load module is provided with keyboard interface at least again.Can import various parameters by keyboard, as range, display type etc.Described load module also is provided with reference battery electric weight input interface and/or IC-card reader interfaces.Reference battery electric weight input interface can offer reference battery charge value of domestic gas meter of the present utility model, and when the battery of family expenses gas meter, flow meter was lower than this reference battery charge value, circuit can produce warning.The IC-card reader interfaces can be used for swiping the card of IC-card, and the user deposits the gas quantity of buying in this IC-card in, and after the reader interfaces place swiped the card, the gas quantity of this purchase was read in the table with IC-card.When user's gas consumption during near the gas quantity of this purchase, circuit can send warning, uses up rear electromagnetic valve fully and closes breather line automatically.Buy new gas quantity once more and swipe the card up to the user, the result after data processing module will be handled reopens breather line by control module and the action of driving circuit control electromagnetic valve.

Further improve again as the utility model, also be provided with pretreatment module between described sensor and the amplification module.Described pretreatment module comprises two followers, can carry out simple process to the signal of sensor output, to improve the antijamming capability of circuit.

Further improve as of the present utility model, described sensor is connected with control circuit by the high temperature shielding line.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of prior mechanical gas meter, flow meter.

Fig. 2 is the physical construction synoptic diagram of electronic domestic gas meter of the present utility model.

Fig. 3 is the circuit block diagram of the utility model electronic domestic gas meter.

Fig. 4 is the circuit diagram of the utility model electronic domestic gas meter.

Fig. 5 is the circuit diagram of the sensor of the utility model electronic domestic gas meter.

Fig. 6 is the circuit diagram of the constant current source of the utility model electronic domestic gas meter.

Fig. 7 is the circuit diagram of the CPU element that comprises amplification module, A/D modular converter, data processing module, output module and control module of the utility model electronic domestic gas meter.

Fig. 8 is the circuit diagram of the display of the utility model electronic domestic gas meter.

Fig. 9 is the infrared emission of the utility model electronic domestic gas meter and the circuit diagram of receiver module.

Figure 10 is the circuit diagram of the keyboard interface of the utility model electronic domestic gas meter.

Figure 11 is the circuit diagram of the interior keys module of the utility model electronic domestic gas meter.

Figure 12 is the circuit diagram of the reference battery electric weight input interface of the utility model electronic domestic gas meter.

Figure 13 is the circuit diagram of the IC-card reader interfaces of the utility model electronic domestic gas meter.

Figure 14 is the circuit diagram of the buzzer circuit of the utility model electronic domestic gas meter.

Figure 15 is the circuit diagram of the driving circuit for electromagnetic valve of the utility model electronic domestic gas meter.

Figure 16 is the circuit diagram of the pretreatment module of the utility model electronic domestic gas meter.

Figure 17 is the circuit diagram of the power module of the utility model electronic domestic gas meter.

Figure 18 is the circuit diagram of the DLL (dynamic link library) module of the utility model electronic domestic gas meter.

Embodiment

Shown in Figure 1 is the structural representation of prior mechanical domestic gas meter, and its defective front was described, and did not repeat them here.

With reference to Fig. 2, electronic domestic gas meter of the present utility model comprises shell 1 and bonnet 2, and the surface of described shell 1 is provided with display panel 25, is provided with the insertion mouth of user's IC-card below display panel 25, which is provided with IC-card lid 3; The motherboard 4 of control circuit is fixed on shell 1 inside surface by screw 24.Be provided with the inlet suction port 5, solenoid valve 9, main tracheae 6, testing tube 7 and the air outlet adapter 8 that are communicated with successively between shell 1 and bonnet 2, the passage between above-mentioned each parts is a breather line 26; Junction between each parts is equipped with O-ring seal 11; Mounting hole by described testing tube 7 inserts thermal flow rate sensor A, makes the airintake direction of sensitive face over against breather line 26.Described thermal flow rate sensor A, its structure can be any standard structure, the disclosed a kind of heat-flow sensor of integrated Si-membrane of Chinese patent CN1040577C instructions for example, the perhaps thermal flow rate sensor of the disclosed a kind of microfabrication of Chinese patent CN1077283C instructions, its structure see relevant instructions for details in full.

Be provided with battery case 12 below bonnet 2, described battery case 12 is connected with bonnet 2 tracks, which is provided with battery case lid 19, and described battery case lid 19 is fixed on the bonnet 2 by nut 22.The front end of described battery case 12 is provided with the snap device 13 that comprises a buckle spring 13 and a buckle handle 14.When changing battery 16, battery case 12 is outwards pulled out along the track on the bonnet 2, push card attacker's handle 14, buckle spring 13 eject battery 16 and get final product.

With reference to Fig. 3, described control circuit comprises:

The heater strip of the described thermal flow rate sensor of _ _ give provides the constant current source B of steady current;

The amplification module C that the aanalogvoltage difference signal of _ _ described sensor is exported amplifies;

_ _ sampling after the described amplification signal and convert it into the A/D modular converter D of digital signal;

The control signal that the data that _ _ to A/D modular converter D transforms carry out computing and storage, receive load module H simultaneously handles that back output shows and/or the data processing module E of control signal;

_ _ receive the demonstration and/or the control signal of data processing module E output provides the output module F of output interface to output device;

The display that _ _ with the signal of output module F output is converted into flow and correlation parameter G.1;

_ _ the provide load module H of input interface to input equipment.

Described output module F is provided with infrared output interface, and G.2 infrared emission and receiver module are connected to described infrared output interface.

The output terminal of described data processing module E also is provided with the control module J that the control signal of described data processing module E output is converted into steering order.

K.1 and solenoid valve interface the output terminal of described control module J is provided with warning device.

Described warning device is a buzzer circuit.

The driving circuit that described control module J also is provided with a solenoid valve K.2.

Described load module H be provided with keyboard I.1 interface, reference battery electric weight input interface I.2 with IC-card reader interface I.3.

Also be provided with pretreatment module M between described sensors A and the amplification module C.

With reference to Fig. 4, power module P is made up of integrated package U3 and part edge electric capacity, and the power supply by battery provides passes and changes reliable and stable 3.3V power supply into, and the part of module in the circuit is provided, as CPU, and pretreatment module etc.

Sensors A inside is respectively by thermoinduction heap TP1, and TP2 and add thermal reactor HEATER and constitute links to each other with the button J3 of company of mainboard by the high temperature shielded conductor.

Constant current source B is made up of boost sheet DW and current stabilization sheet U7 and the peripheral capacitance resistance of part, with the power supply of 6V by the current stabilization that boosts, be connected to 5,6 pin from 2,6 ports of U7 by plug-in unit J3, link to each other with the HEATER two ends of sensors A, the steady current of 4mA is provided, makes the thermal reactor HEATER that adds of sensors A produce a very stationary temperature.

Pretreatment module M is made up of integrated chip U1 and the peripheral resistance capacitance of part, wherein U1 inside comprises 2 groups of independence power amplifiers, form 2 followers by difference short circuit 1,2 pin and 6,7 pin wherein, 5 pin are connected with 1 pin of web member J3, link to each other with 1 end of TP1 in the sensors A, 3 pin connect with 4 pin that have been connected part J3, link to each other with 2 ends of TP2 in the sensors A.The signal of output is connected to 2 pin and 3 pin of CPU respectively by resistance R 20, R21 with 7 pin, 1 pin.

The central module CPU of circuit is the low-power consumption instrument dedicated processes chip MSP430 that has adopted present advanced person, integrated amplification module C, AD modular converter D, data processing module E, output module F, load module H, parts such as control module J.

22 pins of LCDs in G.1 are connected with 36～39 with 12～29 of CPU respectively, handle the back by data processing module D in the CPU and drive display screen G.1 by output module F.

Infrared delivery outlet G.2 mainly contains an infrared transmitting tube and infrared receiving tube is formed, by 59, the 60 pins connection transmission infrared signal of CPU.

I.0 part is the inside knob that is installed on the mainboard, and wherein 2 is that knob simply is set, and also one is breaking-proof switch.Be connected with 45,61,46 pins of CPU respectively.

I.1 be the external keyboard interface, connect 6 pin with CPU.

Wherein I.2 the part in the V point be the battery electric quantity check point, be connected with 4 pin of CPU, CPU compares the available quantity of judging power supply by the voltage with normal power supply.

IC-card reader pin I.3 connects 49～53 pin with CPU respectively, and CPU reads the information such as tolerance of purchasing in the IC-card by this module.

K.1, warning device is made up of hummer and triode, is connected with 11 pin of CPU by resistance R 11, is controlled the Kai Heguan of buzzer warning sound by CPU.

Battery valve control module K.26 triode and part resistance diode is formed, and is connected with 47,48 of CPU, and 1,2 pin by J2 are connected with solenoid valve.CPU by this control module, provides corresponding positive and negative power supply to solenoid valve by the different level of the high end of 47,48 pin output, and solenoid valve is made because of the power supply that provides and opened or closed action.

With reference to Fig. 5-Figure 18, entire circuit is by No. 5 powered battery of 4 joints, and power module P provides the 3.3V power supply to part of module.Constant current source B provides the steady current of 4mA for the HEATER of sensors A, and the HEATER of sensors A sends highly stable thermal source.Move the heat distribution situation that has changed this thermal source because of the air-flow in the pipeline, two groups of thermoinduction heaps of TP1 in the sensors A and TP2 can produce certain variation in voltage, TP1 in the sensors A and the voltage signal of TP2 are delivered to respectively among the U1 in the pretreatment module, signal to sensors A is done interference stability, output to 2,3 pin of CPU again, amplification module C among the CPU flows to A/D modular converter D after this signal is done processing and amplifying.A/D modular converter D is the conversion of signals after amplifying a data-signal.Data processing module E does conversion to this data-signal, calculates computings such as storage.Be transported to output module F after being calculated to be flow signal, G.1 output module shows to this information LCDs and also can G.2 send to the infrared table device of getting to these data by infrared interface.

I.0 in, can set few parameters in the instrument by setting and page turning key, breaking-proof switch is installed on the circuit main board, is close to and meter case, and when the situation that circuit board is disassembled occurring, ducted solenoid valve 9 can cut out immediately, disconnects source of the gas.

I.1, external keyboard is connected with the pin of CPU by keyboard interface, can be at all parameter adjustments and setting in the instrument.Comprise the inspection of instrument self, directly to the control of solenoid valve, the reading etc. of IC-card.

The voltage that CPU is provided in I.2 by battery voltage detection point compares with inner set magnitude of voltage and lower voltage limit value, when the magnitude of voltage on this check point during less than the magnitude of voltage that is provided with and greater than the lower voltage limit value, K.1, CPU sends alerting signal for warning device by control module J, and display screen G.1 on the prompting so that the reminding user to replace battery.When this potential value reached lower voltage limit value or complete no-voltage, solenoid valve controller used internal backup battery to close electromagnetic valve.And close the work of whole instrument.

I.3, IC-card is read the gas information of purchasing of IC-card as CPU by the IC-card card reading module, and CPU is added to former surplus to this tolerance, and the erasing of information in the card.Lack after some when the combustion gas residual of being stored in the CPU, the control module J in the CPU can give K.1 signal of warning device, and K.1 warning device can send alarm sound, buys combustion gas to remind the user.After remaining combustion gas value used up fully, K.2 the control module J in the CPU provided a closing information can for the solenoid control module, and solenoid valve 9 is shut valve, disconnects air feed.

What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the present utility model.

Claims (10)

1, a kind of electronic domestic gas meter, comprise shell (10), described shell (1) is provided with display panel (25), be provided with control circuit and breather line (26) in the shell (1), the two ends of described breather line (26) are provided with inlet suction port (5) and air outlet adapter (8), the centre is provided with sensor (A), it is characterized in that described sensor is a thermal flow rate sensor, and described control circuit comprises:

---the constant current source (B) of steady current is provided to the heater strip of described thermal flow rate sensor;

---the amplification module (C) that the aanalogvoltage difference signal of described sensor output is amplified;

---signal after the described amplification of sampling also converts it into the A/D modular converter (D) of digital signal;

---to A/D modular converter (D) transform that good data are carried out computing and storage, the control signal that receives load module (H) simultaneously handles that back output shows and/or the data processing module (E) of control signal;

---receive the demonstration and/or the control signal of data processing module (E) output, the output module (F) of output interface is provided to output device;

---the signal of output module (F) output is converted into the display (G.1) of flow and correlation parameter;

---the load module (H) of input interface is provided to input equipment.

2, a kind of electronic domestic gas meter as claimed in claim 1 is characterized in that described output module (F) is provided with infrared output interface, and infrared emission and receiver module (G.2) are connected to described infrared output interface.

3, a kind of electronic domestic gas meter as claimed in claim 1 is characterized in that the output terminal of described data processing module (E) also is provided with the control module (J) that the control signal of described data processing module (E) output is converted into steering order.

4, a kind of electronic domestic gas meter as claimed in claim 3 is characterized in that the output terminal of described control module (J) is provided with warning device and/or solenoid valve interface.

5, a kind of electronic domestic gas meter as claimed in claim 4 is characterized in that described warning device is a buzzer circuit.

6, a kind of electronic domestic gas meter as claimed in claim 4 is characterized in that described control module (J) also is provided with the driving circuit (K.1) of a solenoid valve, is provided with solenoid valve (9) in the described breather line (26).

7, a kind of electronic domestic gas meter as claimed in claim 1 is characterized in that described load module (H) is provided with keyboard (I.1) interface at least.

8, a kind of electronic domestic gas meter as claimed in claim 7 is characterized in that described load module (H) also is provided with reference battery electric weight input interface (I.2) and/or IC-card reader (I.3) interface.

9, a kind of electronic domestic gas meter as claimed in claim 1 is characterized in that also being provided with pretreatment module (M) between described sensor (A) and the amplification module (C).

10, a kind of electronic domestic gas meter as claimed in claim 1 is characterized in that described sensor (A) is connected with control circuit by the high temperature shielding line.

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