CN201589673U - Large-caliber heat meter verification device - Google Patents

Abstract

The utility model discloses a verification device for a large-caliber heat meter. It has a simple structure, easy to use, and the measuring range is DN50~DN300. The device adopts the quality method + standard meter method, which not only saves cost, reduces occupied space, is convenient and practical, but also can complete the heat meter that meets the requirements of grades 1, 2, and 3. Type evaluation, verification, measurement performance test and other requirements. Its structure is as follows: it includes a heating system, the heating system is connected with at least one fluid container, the fluid container is connected with the power system of stabilizing pressure, the power system of stabilizing pressure is connected with the standard instrument group of the standard meter method, the standard instrument group of the standard meter method is connected with the tested meter System connection, the tested meter system is connected to the mass method standard set through the connecting pipeline, the connecting pipeline, the standard meter standard set and the checked meter system are all connected to the flow adjustment system, the mass method standard set will test the fluid Return fluid container.

Description

Large-caliber heat meter verification device

technical field

The utility model relates to a metering device, in particular to a large-caliber heat meter verification device, which is used for the measurement verification and accuracy test of the large-caliber heat meter.

Background technique

In 2000, the country began to carry out heating reform, from charging based on heating area to heating metering charging reform. The heating development and reform in the past 10 years has achieved initial results. The state not only compels the installation of household heat meters, but also requires the installation of large-diameter heat meters used for heating metering in residential quarters and residential units. Heat meters used for heating main pipelines, residential areas and corridors are generally called large-caliber heat meters, and the caliber is generally above DN50. At present, the largest caliber heat meter verification device in my country is DN80, and there is only one in the whole country. In terms of quantity and capacity, it cannot meet the requirements of measurement management, type evaluation, and first verification of heat meters, which seriously hinders the process of heating reform.

Contents of the invention

The purpose of this utility model is to solve the above problems, to provide a simple structure, easy to use, measuring range of DN50 ~ DN300, the device adopts quality method + standard table method, which not only saves cost, reduces occupied space, is convenient and practical, And it can complete the type evaluation, verification, measurement performance test and other requirements of class 1, 2 and 3 heat meters.

In order to achieve the above object, the utility model adopts the following technical solutions:

A large-diameter heat meter verification device, which includes a heating system, the heating system is connected to at least one fluid container, the fluid container is connected to a power system with a constant pressure, the power system with a stable pressure is connected to a standard instrument group of the standard table method, and the standard device of the standard table method The group is connected with the meter system under inspection, the meter system under inspection is connected with the quality method standard device group through the connecting pipeline, the connecting pipeline, the standard meter method standard device group and the meter system under inspection are all connected with the flow regulation system, the quality method standard device The group returns the detected fluid to the fluid container.

The standard meter group includes a plurality of electromagnetic flowmeters as standard meters, which are connected in parallel to form a standard meter group.

There are six standard meters in total, including 4 DN100 calibers, 1 DN40 caliber and 1 DN15 caliber. Each standard meter is equipped with a pneumatic valve at the rear end, and any one or several combinations or all of them can be selected according to the verification requirements. .

The inspected meter system is composed of multiple inspected meters connected in parallel and/or in series, wherein the inspected meters with calibers of DN300, DN250, DN200, DN150, and DN125 form tiled pipelines, and the calibers of DN100, DN80, DN65, and DN50 are The meter inspection consists of multi-epitope replaceable pipelines, and each pipeline is connected to the standard instrument group of the standard meter method.

The flow regulating system includes a plurality of electric regulating valves, which are installed on the connecting pipeline between the tested meter system and the mass method standard device group; Valve; the flow regulating system also includes two valves connected in series at both ends of each meter to be checked in the checked meter system, and the whole flow regulating system is connected with a computer.

The mass method standard set includes a plurality of electronic balances, and each electronic balance is in communication with a connecting pipeline.

The heating system includes one or more of a gas boiler, an electric heater and a solar heating system.

The pressure stabilizing power system includes a water pump, the water pump is connected to the surge tank through a check valve, the surge tank is provided with a pressure transmitter, the pressure transmitter is connected to the water pump controller, and the water pump controller adjusts the water pump according to the pressure of the surge tank run.

The mass method standard set sends the detected fluid back to the fluid container in two ways: the weighing container adopts a bottom valve to release water, and the weighing container and the weighing container adopt an automatic drainage method relying on atmospheric pressure without hard connection with the outside world.

The working principle of the utility model is:

It uses an electronic balance and a standard table as the primary and secondary standards.

3 electronic balances, 3t, 600kg and 150kg. Corresponding flow measurement range (0.05～120)m ³ /h.

Standard meter: 4 DN100, 1 DN40, 1 DN15 electromagnetic flowmeters. Measuring range (0.05～500)m ³ /h.

According to the two working methods of the standard device: standard table method and quality method.

Measuring range of mass method: (0.05～120)m ³ /h;

Measuring range of standard table method (0.2～500)m ³ /h.

Heating method: gas boiler, electric heating, solar energy, used at the same time or separately.

The water flowing through the "tested meter" flows through the "standard meter" at the same time, and the indication value error between the tested meter and the standard meter can be obtained by comparing the indications of the two.

The water flowing through the "checked meter" flows into the "electronic balance" at the same time, and the value of the checked meter is compared with the water collected in the balance weighing container, and the relationship between the checked meter and the weighing value of the balance can be obtained , so as to obtain the indication error of the tested meter.

In the pressure-stabilizing power system, a pressure transmitter is installed on the pressure-stabilizing tank, and the pressure signal is output to the water pump controller, and the water pumps are started one by one according to the pressure change. The last pump to be started is controlled by a frequency converter to achieve stable pressure function to stabilize the flow. The flow regulation system realizes the flow control by automatically adjusting the electric regulating valve through calculation. Because there is a "dead angle" in the manifold of the parallel pipeline, there will be gas resident. When it exists between the standard meter and the test, because the gas volume changes greatly with the pressure, the resident gas will affect the test results. The pipeline is not allowed to have Gas is present and must be vented. An exhaust device is installed in front of each straight pipe section at the header. The exhaust device is composed of pipelines and valves. During operation, the valves are controlled by a computer and opened and closed according to the set sequence to control the exhaust effect. The fluid container is a water tank or an oil tank or a box of other flowing substances, which is automatically controlled by the main heating of the gas boiler and the auxiliary electric heating; the verification or test of the heat meter needs to raise the water temperature to the verification and test requirements. Reach (50±5)℃, and the temperature cannot change 5K each time. The design of this device adopts gas boiler heating, and electric heating is used as auxiliary heating to ensure the stability of the test temperature; the solar heating energy is designed according to the heat preservation effect of the water tank, and the solar energy is used to heat the water tank to provide daily non-working water temperature maintenance. During the general test, the water temperature should reach (50±5)℃. The caliber of the thermal energy meter is divided into different sizes. The water consumption of the thermal energy meter with the smaller caliber is small for verification, and the water consumption for the verification of the larger caliber is large. In order to save energy and speed up the temperature rise, it is decided to heat a The water tank is still two water tanks. The water tanks are connected by double valves. When one water tank is heated, the space between the two valves is emptied to reduce heat conduction.

The beneficial effect of the utility model is that it is mainly used for the type evaluation, verification and metering performance test of large-diameter heat meters, and it is also used for metering performance tests of other liquid meters and the comparison of metering performance under various medium temperatures. Provide reliable data for the formulation of relevant standards and regulations. The degree of automation is high, and computer control can be adopted. Pneumatic valves and electric regulating valves can be used to control the flow rate. The balance, standard table data and verified data are automatically collected by the computer.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them, 1. Water storage tank, 2. Gas boiler, 3. Water pump, 4. Check valve, 5. Regulator tank, 6. Pressure transmitter, 7. Water pump controller, 8. Standard meter, 9. Valve, 10. Checked meter, 11.3t electronic balance, 12.600kg electronic balance, 13.150kg electronic balance, 14. Electric regulating valve, 15. Pneumatic valve.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

In Fig. 1, there are two water storage tanks 1, which are respectively heated by gas boilers 2. In order to ensure temperature stability, the water storage tank 1 is also connected with an electric heating device or a solar heating system. The water storage tank 1 is connected to the surge tank 5 through the water pump 3 and the check valve 4. The pressure transmitter 6 is provided on the surge tank 5. The pressure transmitter 6 is connected to the water pump controller 7, and the water pump controller 7 controls the operation of the water pump. , so that a stable flow of hot water can be guaranteed through the system. The output end of the surge tank 5 is connected to the standard instrument group of the standard meter method through a pipeline, and the standard meter group of the standard meter method includes at least one standard meter 8 (electromagnetic flowmeter), and the output end of the standard meter group of the standard meter method is connected to the meter system under inspection , the checked meter system is a plurality of checked meters 10 connected in parallel. The output ends of each meter to be checked are connected to the mass method standard device group through connecting pipelines. The mass method standard device group includes a 3t electronic balance 11, a 600kg electronic balance 12 and a 150kg electronic balance 13. Weighing is carried out, and the weighed fluid is sent back to the water storage tank 1 . The flow regulating system includes a plurality of electric regulating valves 14, which are installed on the connecting pipeline between the meter system to be checked and the mass method standard device group; includes pneumatic valves 15 connected in series for each standard meter 8 in the standard meter method standard device group; Including valves 9 connected in series at both ends of each checked meter 10 in the checked meter system, the entire flow regulating system is connected with a computer. Simultaneously each standard meter 8, checked meter 10 and electronic balance are also connected with computer.

Claims (9)

1. heavy caliber heat meter calibration facility, it is characterized in that, it comprises heating system, heating system is connected with at least one fluid container, fluid container is connected with the voltage stabilizing power system, the voltage stabilizing power system is connected with method of standard table standard group, method of standard table standard group is connected with tested table system, tested table system is connected with mass method standard group by connecting line, connecting line, method of standard table standard group all are connected with flow control system with tested table system, and mass method standard group will detect the back fluid and send fluid container back to.

2. heavy caliber heat meter calibration facility as claimed in claim 1 is characterized in that, described method of standard table standard group comprises a plurality of electromagnetic flowmeters as standard scale (8), and they compose in parallel method of standard table standard group.

3. heavy caliber heat meter calibration facility as claimed in claim 2, it is characterized in that, totally six of described standard scales (8), wherein be 4 of DN100 bores, 1 of DN40 bore, 1 of DN15 bore, each standard scale (8) rear end is equipped with operated pneumatic valve (15), require to select wherein any one or several combinations or all uses according to calibrating.

4. heavy caliber heat meter calibration facility as claimed in claim 1, it is characterized in that, described tested table system is in parallel and/or be composed in series by a plurality of tested tables (10), wherein the tested table (10) of DN300, DN250, DN200, DN150, DN125 bore is formed the tiling pipeline, the tested table (10) of DN100, DN80, DN65, DN50 bore is formed the replaceable pipeline of multi-epitope, and each pipeline is connected with method of standard table standard group.

5. as claim 1 or 2 or 3 or 4 described heavy caliber heat meter calibration facilities, it is characterized in that described flow control system comprises a plurality of electric control valves (14), they are installed on the connecting line between tested table system and mass method standard group; Flow control system also comprises the operated pneumatic valve (15) that each standard scale (8) is connected respectively in the method for standard table standard group; Flow control system also comprises two valves (9) of each tested table (10) two ends series connection in the tested table system, and whole flow control system is connected with computing machine.

6. heavy caliber heat meter calibration facility as claimed in claim 1 is characterized in that, described mass method standard group comprises a plurality of electronic balances, and each electronic balance all is communicated with connecting line.

7. heavy caliber heat meter calibration facility as claimed in claim 1 is characterized in that, described heating system comprises one or more in gas fired-boiler (2), electric heater and the solar heating system.

8. heavy caliber heat meter calibration facility as claimed in claim 1, it is characterized in that, described voltage stabilizing power system comprises water pump (3), water pump (3) is connected with buffer tank (5) by non-return valve (4), buffer tank (5) is provided with pressure unit (6), pressure unit (6) is connected with water pump controller (7), and water pump controller (7) is adjusted water pump (3) operation according to buffer tank (5) pressure.

9. heavy caliber heat meter calibration facility as claimed in claim 1, it is characterized in that, described mass method standard group will detect the back fluid and send fluid container back to, adopt dual mode: weighing container (11) adopts bottom valve to discharge water, and weighing container (12) and weighing container (13) adopt with extraneous no hard connecting mode and rely on the automatic drainage pattern of atmospheric pressure.