CN201277892Y - Digital correcting automatic compensating measurement apparatus for quantity of flow - Google Patents

Abstract

The utility model relates to a flow measuring technology for a calorimeter, in particular to a flow digital correcting automatic compensation technology comprising a flow sensor, a microprocessor and a pairing temperature sensor. The microprocessor gets a flow signal through the flow sensor, gets a water temperature signal of a water inlet and a water outlet from a temperature measuring circuit and calculates the heat quantity released by liquid with heat quantity according to a standard heat calculation formula. The flow sensor obtains the pulse count of water which passes through a measuring meter, the flow is not in linearity with the pulse count but is relative to the flow speed, so the pulse count needs to be corrected and then is converted into flow, the pulse count corresponds to the flow speed, while a curved line exists between the pulse count and the flow and is divided into eight sections which are corrected one by one. A microcomputer compares the pulse flow value of each section of flow with the standard pulse flow value, when any error exists, the microcomputer automatically compensate the section of pulse flow value to be the standard flow value, so that the measurement of the measuring meter reaches the most accurate value.

Description

A kind of traffic figure correction automatic compensation measuring device

(1), technical field

The utility model relates to a kind of heat quantity flow metering device, particularly relates to a kind of traffic figure correction automatic compensation measuring device.

(2), background technology

At present, be used to measure the actual instrument of central heating user both at home and abroad with heat, be divided into two types by the metering system difference, a kind ofly be the heat dissipation capacity by radiator in the measuring chamber and calculate the heat distribution value, another kind is by measurement the flow through discharge and the temperature difference of user's heat supply pipeline heat, again through calculating and accumulative total obtains calorie value.Use often, use and management is conveniently a kind of discharge formula instrument in back.

China is carrying out the central heating system reform, and purpose is to break welfare system, makes the heat supply commercialization.Under welfare system, press the charge of dwelling house area with heat always, although this method has investment tubule reason characteristic of simple, but what are with irrelevant with heat demand owing to pay dues, also irrelevant with the heat insulating ability of building, thereby can't take the adjusting relation between supply and demand with heat, and also be unfavorable for energy savings, become an obstacle of reform.Carry out commercialization, should be with the heat nature as use the table meterage with tap water, how many numbers table walks, and just receives how many expenses by unit price, many with paying dues, few with paying dues less more, has saved with heat and has just saved expense naturally.Yet fact proved that effect is really not so.Heat supply is different with water supply, heat energy is produced and is difficult to storage, heat energy in pipeline is no matter you use and disuse and can constantly miss, the thermal efficiency difference of equipment under different load of producing heat energy is very big, especially large coal-fired boiler and hot water cyclesystem, operation can cause very big energy dissipation under low load condition.If open in the time of can causing the user to go home by the table meterage with tap water is equally simple with thermal imagery, close when going out, form the hot mode of using of " switch " formula.Especially, the most of hot user's of China daily schedule is similar, and resident's the level of consumption is also not high, and " saving " consciousness is very strong, all adopts the household metering charge method, and general " switch " formula that can form is with hot.In view of this type of situation, the subject matter that the numerous especially users of the accuracy of measuring of heat are concerned about.And the calorimeter on the market is not all noted or ignored this problem, and a slight error through accumulation for a long time, can become very big metering mistake, brings unnecessary trouble for user and administrative authority.

(3), utility model content

The utility model has proposed a kind of traffic figure correction automatic compensation measuring device at the error that exists in the calorimeter metering on the market.

Calorimeter is to be used for measuring and to show that carrying the cold and hot liquids cold and hot exchange system of flowing through discharges high-performance, the smart instrumentation of cold and hot amount, is made up of flow sensor, microprocessor and pairing temperature sensor.Microprocessor obtains flow signal by flow sensor, obtains the water temperature signal of water delivering orifice and water inlet from temperature measurement circuit, calculates the heat that thermal liquid discharges according to standard heat Calculation formula.

Base table is connected with microprocessor by flow sensor, and temperature sensor is connected with microprocessor by temperature measurement circuit, and microprocessor links to each other with solenoid valve by driving circuit.

Unique metering method of calorimeter has determined the variable of the used heat of user to depend on the temperature difference of the water of the flow by the water of gauging table, hot coefficient and the gauging table of flowing through.Obviously, hot coefficient is constant, and the temperature difference is to obtain by the gap between the temperature of the temperature of water inlet and water delivering orifice, and is very little to the influence of calorie value metering, and the principal element that influences the calorie value metering is the metering of hot water flow.

And flow sensor obtains is umber of pulse through the water of gauging table, each pulse all has the pulse equivalency of an acquiescence, flow and umber of pulse are not linear, relevant with flow velocity, so convert flow to after needing number of pulses to do correction, umber of pulse is corresponding to flow velocity, and between umber of pulse and the flow a corresponding curve arranged, this curve is divided into 8 sections, and each section is revised one by one.

To be divided into eight sections between minimum flow and the maximum flow, eight sections endpoint values are respectively minimum flow, 0.1 times nominal flow rate, 0.2 times nominal flow rate, 0.3 times nominal flow rate, 0.5 times nominal flow rate, nominal flow rate and maximum flow.Impeller metering mechanism converts the rotation of impeller electric impulse signal to and carries out record by counter by flow detection sensor.On each flow point, a reference pulse equivalent of acquiescence through Hose Test, draws real pulse equivalency value according to flow value that gauging table measured and the error between institute's amount of flush water.Micro computer is modified to actual pulse equivalency value with the pulse equivalency of acquiescence automatically then, in the metering process afterwards, gauging table will calculate with the pulse equivalency value of reality, the error of the discharge of feasible like this process flowmeter is reduced within the error allowed band, and it is minimum that error in dipping is dropped to.

When bath detects, micro computer is compared with the full sized pules flow value according to the stream of pulses value of each section flow velocity, if have error between the stream of pulses value of this section and the full sized pules flow value, micro computer then automatically will this section the stream of pulses value replenish and be the normal stream value, make the metering of gauging table reach the most accurate.

The beneficial effects of the utility model are:

1, flow is divided into 8 sections sectional calibration corrections, makes the flow metering precision high.

2, the application of automatic compensatory technique, the flow velocity of segmentation all reaches standard flow rate, for the accuracy of measuring provides strong guarantee.

(4), description of drawings

Fig. 1 is the principle schematic of a kind of traffic figure correction of the utility model automatic compensation measuring device.

(5), embodiment

As shown in Figure 1, the utility model is made up of flow sensor, microprocessor and pairing temperature sensor.Microprocessor obtains flow signal by flow sensor, obtains outlet and inlet water temperature signal from temperature measurement circuit, calculates the heat that thermal liquid discharges according to standard heat Calculation formula.Unique metering method of calorimeter has determined the variable of the used heat of user to depend on the temperature difference of the water of the flow by the water of gauging table, hot coefficient and the gauging table of flowing through.Obviously, hot coefficient is constant, and the temperature difference is to obtain by the gap between the temperature of the temperature of water inlet and water delivering orifice, and is very little to the influence of calorie value metering, and the principal element that influences the calorie value metering is the metering of hot water flow.

And flow sensor obtains is umber of pulse through the water of gauging table, flow and umber of pulse are not linear, relevant with flow velocity, so convert flow to after needing number of pulses to do correction, umber of pulse is corresponding to flow velocity, and between umber of pulse and the flow a corresponding curve is arranged, and this curve is divided into 8 sections, each section is revised one by one.

When bath detects, micro computer is compared with the full sized pules flow value according to the stream of pulses value of each section flow velocity, if have error between the stream of pulses value of this section and the full sized pules flow value, the stream of pulses value that micro computer then automatically will this section replenishes and is the normal stream value.Make the metering of gauging table reach the most accurate.

Claims (1)

1, a kind of traffic figure correction automatic compensation measuring device, contain flow sensor, microprocessor and pairing temperature sensor, it is characterized in that: base table is connected with microprocessor by flow sensor, temperature sensor is connected with microprocessor by temperature measurement circuit, and microprocessor links to each other with solenoid valve by driving circuit.

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