CN108917891B - High-temperature liquid flow standard device - Google Patents
High-temperature liquid flow standard device Download PDFInfo
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- CN108917891B CN108917891B CN201811146407.XA CN201811146407A CN108917891B CN 108917891 B CN108917891 B CN 108917891B CN 201811146407 A CN201811146407 A CN 201811146407A CN 108917891 B CN108917891 B CN 108917891B
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- 239000007788 liquid Substances 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 176
- 238000012360 testing method Methods 0.000 claims abstract description 85
- 238000005303 weighing Methods 0.000 claims abstract description 21
- 239000000498 cooling water Substances 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 61
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000008236 heating water Substances 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000011056 performance test Methods 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/14—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a weighing apparatus
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a high-temperature liquid flow standard device, which comprises a checked meter, a hot water storage tank, a standard flowmeter, a weighing container, an electronic scale and a water storage tank, wherein the hot water storage tank is communicated with the water storage tank through a test pipeline; the hot water storage tank is connected with a water storage tank through a pipeline, and a water pump, a first test ball valve, a detected meter, a first thermometer, a test pressure meter, a second test ball valve, a standard flowmeter, an electric regulating valve, a third test ball valve, a heat exchanger, a fourth test ball valve, a second thermometer, a reverser, a third thermometer, a weighing container and a fifth test ball valve are sequentially arranged on the test pipeline; a cooling flow meter and a circulating water pump are arranged on a cooling water inlet pipe of the heat exchanger; one pipeline of the reverser is communicated to the water storage tank through the weighing container, and the other pipeline is directly communicated to the water storage tank; the weighing container is placed on an electronic scale. The device adopts a standard meter method and a quality method to perform performance test on the detected meter at the water temperature of more than 100 ℃, and has accurate measurement and small error.
Description
Technical Field
The invention relates to the technical field of flow metering, in particular to a high-temperature liquid flow standard device.
Background
The liquid flow standard device is a measurement standard for tracing the magnitude of a liquid flow measurement instrument. Such as water meters, electromagnetic flow meters, etc., for metering liquid flow, the accuracy of which requires verification or calibration by a liquid flow standard device.
The liquid flow standard devices are generally classified into (cold) water flow standard devices and hot water flow standard devices according to the temperature range of the medium. For example, a domestic cold water meter is calibrated by a (cold) water flow standard device, and a heat meter is calibrated by a hot water flow standard device. The medium temperature of the (cold) water flow standard device works below 30 ℃, and the medium temperature of the hot water flow standard device is generally in the range of normal temperature to 90 ℃.
Some flow meter devices have working medium temperatures in excess of 100 ℃ and high temperature liquid flow standard devices are required to perform real flow testing of liquid flow meter devices at temperatures in excess of 100 ℃. In order to develop research and test of metering characteristics of the high-temperature liquid flow metering device, development and construction of a high-temperature liquid flow standard device have great needs.
Disclosure of Invention
The invention provides a high-temperature liquid flow standard device, which aims to solve the problems of research and test of metering characteristics of a high-temperature liquid flow metering device.
The invention provides a high-temperature liquid flow standard device, which comprises a tested meter, a hot water storage tank, a standard flowmeter, a weighing container, an electronic scale and a water storage tank, wherein the tested meter is a tested flow metering device, the hot water storage tank is used for storing hot water with the temperature of more than 100 ℃, and the hot water storage tank is communicated with the water storage tank through a test pipeline; the hot water storage tank is connected with a water storage tank through a pipeline, and a water pump, a first test ball valve, a detected meter, a first thermometer, a test pressure meter, a second test ball valve, a standard flowmeter, an electric regulating valve, a third test ball valve, a heat exchanger, a fourth test ball valve, a second thermometer, a reverser, a third thermometer, a weighing container and a fifth test ball valve are sequentially arranged on the test pipeline; the cooling water outlet pipeline and the cooling water inlet pipeline of the heat exchanger are both communicated with a cooling water tank, and the cooling water inlet pipeline is provided with a cooling flowmeter and a first circulating water pump; one pipeline of the reverser is communicated to the water storage tank through the weighing container, and the other pipeline is directly communicated to the water storage tank; the weighing container is placed on the electronic scale; the system also comprises a first recovery pipeline and a second recovery pipeline, wherein the first recovery pipeline is used for recovering from the water storage tank to the hot water storage tank, and a recovery water pump and a recovery check valve are sequentially arranged on the first recovery pipeline according to the recovery direction; the second recovery pipeline is recovered to the hot water storage tank by the test pipeline, and the second recovery pipeline is provided with a recovery ball valve.
Optionally, the hot water storage tank is a sealed heating storage tank, and the sealed heating storage tank is provided with a circulating heating pipeline, a steam adjusting pipeline, a pressure controller, a pressure relief valve, a hot water thermometer, a hot water pressure gauge, a hot water recovery pipeline and a hot water check valve in a communicating manner, wherein the circulating heating pipeline returns to the sealed heating storage tank through a second circulating water pump and a heating loop heat exchanger by the sealed heating storage tank, and the hot fluid of the heating loop heat exchanger is steam from a boiler; the steam adjusting pipeline sends steam into the sealed heating water storage tank through the pressure reducing valve and the steam ball valve; the hot water recovery pipeline is used for recovering the water from the sealed heating water storage tank to the water storage tank, and a hot water recovery ball valve is arranged on the hot water recovery pipeline.
Optionally, the hot water storage tank is an open hot water storage tank, and an open water inlet and a hot water thermometer are arranged on the open hot water storage tank.
Optionally, the hot water recovery device further comprises a controller, wherein the controller is in control connection with the pressure controller, the pressure release valve, the hot water check valve, the pressure release valve, the steam ball valve, the hot water recovery ball valve, the test water pump, the first test ball valve, the second test ball valve, the electric control valve, the third test ball valve, the fourth test ball valve, the fifth test ball valve, the circulating water pump, the recovery check valve and the recovery ball valve.
The invention has the following beneficial effects:
the invention relates to a high-temperature liquid flow standard device, in particular to a liquid flow standard device with medium temperature exceeding 100 ℃, which can test the metering performance of a flow metering device under the condition that the medium temperature exceeds 100 ℃. The invention can adopt two test methods of standard meter method and quality method to compare and test, and has accurate measurement and small error.
In addition, the test medium is heated by adopting a method of sealing and heating the water storage tank, so that the medium cannot evaporate in the heating process; before the hot water flows out of the pipeline, the temperature of the hot water can be reduced to be lower than 100 ℃ through the heat exchanger, so that the evaporation of the hot water flowing into the weighing container is reduced, and the accuracy is better when the measurement is carried out by a mass method.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a high temperature liquid flow standard device according to the present invention;
fig. 2 is a schematic structural diagram of another high-temperature liquid flow standard device provided by the invention.
The reference numerals in fig. 1 and 2 denote: 1-inspected meter, 2-hot water storage tank, 3-standard flowmeter, 4-weighing container, 5-electronic scale, 6-water storage tank, 7-test line, 8-cooling water outlet line, 9-cooling water inlet line, 10-cooling water tank, 11-first recovery line, 12-second recovery line, 2-sealed heating water storage tank, 2B-open hot water storage tank, 21-circulation heating line, 22-steam conditioning line, 23-pressure controller, 24-pressure release valve, 25-hot water thermometer, 26-hot water pressure meter, 27-hot water recovery line, 28-hot water check valve, 29-water inlet, 211-second circulation water pump, 212-heating loop heat exchanger, 221-pressure release valve, 222-steam ball valve, 271-hot water recovery ball valve, 71-test water pump, 72-first test ball valve, 73-first thermometer, 74-test pressure meter, 75-second test ball valve, 76-electric conditioning valve, 77-third test, 78-heat exchanger, 79-fourth test ball valve, 710-second thermometer, 92-third switch, 111-cooling water pump, 112-return pump, and return pump 713-112-recovery valve.
Detailed Description
The invention provides a high-temperature liquid flow standard device, which aims to solve the problems of research and test of metering characteristics of a high-temperature liquid flow metering device. The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the high-temperature liquid flow standard device provided in this embodiment 1 includes a table 1 to be inspected, a hot water storage tank 2, a standard flow meter 3, a weighing container 4, an electronic scale 5, and a water storage tank 6.
Specifically, the test table 1 is a flow meter to be tested, and the hot water storage tank 2 (not shown) is a sealed heating storage tank 2A for heating and storing hot water at 100 ℃. The sealed heating water storage tank 2A is provided with a circulating heating pipeline 21, a steam adjusting pipeline 22, a pressure controller 23, a pressure relief valve 24, a hot water thermometer 25, a hot water pressure gauge 26, a hot water recovery pipeline 27 and a hot water check valve 28 in a communicating manner, wherein the circulating heating pipeline 21 is formed by returning the sealed heating water storage tank 2A from the sealed heating water storage tank 2A through a second circulating water pump 211 and a heating loop heat exchanger 212, and the hot fluid of the heating loop heat exchanger 212 is steam from a boiler; the steam regulating pipeline 22 sends steam into the sealed heating water storage tank 2A through the pressure reducing valve 221 and the steam ball valve 222; the hot water recovery line 27 is recovered from the sealed heating water storage tank 2A to the water storage tank 6, and a hot water recovery ball valve 271 is provided on the hot water recovery line 27. Wherein, the circulating heating pipeline 21 adopts a heat exchange method to heat and seal the water in the water storage tank 2A so that the temperature exceeds 100 ℃, the test temperature is met, and the water temperature is measured by the hot water thermometer 25. Due to the sealed heating of the water storage tank 2A, a steam conditioning line 22 is required to assist the hot water into the test line 7. The pressure controller 23 and the relief valve 24 are provided to prevent an unexpected occurrence of explosion of the tank body due to an excessive pressure in the tank. The hot water pressure gauge 26 is used to monitor the pressure in the tank and assist the opening and closing of the steam adjusting pipeline 22, the pressure controller 23 and the pressure relief valve 24. The hot water check valve 28 is to prevent the sealed heating water storage tank 2A in a closed state from being deformed and damaged due to the negative pressure formed in the medium temperature decrease and the outside, when the pressure in the sealed heating water storage tank 2A is lower than the external pressure, the hot water check valve 28 is opened, and the pressure in the water tank is balanced with the atmospheric pressure.
The sealed heating water storage tank 2A is communicated with the water storage tank 6 through a test pipeline 7, and the water storage tank 6 is an open water storage tank; in the direction from the hot water storage tank 2 to the water storage tank 6, a test water pump 71, a first test ball valve 72, a detected table 1, a first thermometer 73, a test pressure gauge 74, a second test ball valve 75, a standard flow meter 3, an electric control valve 76, a third test ball valve 77, a heat exchanger 78, a fourth test ball valve 79, a second thermometer 710, a reverser 711, a third thermometer 712, a weighing container 4 and a fifth test ball valve 713 are sequentially arranged on the test pipeline 7. The cooling water outlet pipeline 8 and the cooling water inlet pipeline 9 of the heat exchanger 78 are both communicated with the cooling water tank 10, the cooling water inlet pipeline 9 is provided with a cooling flow meter 91 and a first circulating water pump 92, the temperature of hot water is required to be reduced to a state of being difficult to evaporate under 1 atmosphere before flowing to the reverser 711, the hot water is weighed and used by a static mass method, and the temperature of the hot water in the heat exchanger 78 is reduced by cold water in the cooling water tank 10. One pipeline of the reverser 711 passes through the weighing container 4, a valve 713 is arranged at the bottom of the weighing container 4, the valve 713 is opened to discharge water in the weighing container 4 to the water storage tank 6, and the other pipeline is directly communicated to the water storage tank 6; the weighing container 4 is placed on an electronic scale 5. The device further comprises a first recovery pipeline 11 and a second recovery pipeline 12, wherein the first recovery pipeline 11 is recovered from the water storage tank 6 to the hot water storage tank 2, and a recovery water pump 111 and a recovery check valve 112 are sequentially arranged on the first recovery pipeline 11 according to the recovery direction; the second recovery pipeline 12 is recovered from the test pipeline 7 to the hot water storage tank 2, and a recovery ball valve 121 is arranged on the second recovery pipeline 12.
And a controller (not shown in the figure) which is in control connection with the pressure controller 23, the pressure release valve 24, the hot water check valve 28, the pressure release valve 221, the steam ball valve 222, the hot water recovery ball valve 271, the test water pump 71, the first test ball valve 72, the second test ball valve 75, the electric control valve 76, the third test ball valve 77, the fourth test ball valve 79, the fifth test ball valve 713, the first circulating water pump 92, the recovery water pump 111, the recovery check valve 112, and the recovery ball valve 121. The controller is arranged to facilitate the opening and closing of the various valves and the water pump.
Among them, in order to ensure safety, the present embodiment 1 provides a pressure controller 23 on the seal-heated water storage tank 2A, and generates an excessive pressure on the seal-heated water storage tank 2A in order to reduce expansion of the heating process water. The working mode is as follows: the pressure protection upper and lower limit values (P1, P2) are set, the pressure controller 23 transmits a pressure signal to the controller in real time, when the pressure exceeds P2, the controller outputs a control signal to enable the hot water recovery ball valve 271 to be opened, water in the sealed heating water storage tank 2A is discharged into the water storage tank 6, and when the pressure is smaller than P1, the hot water recovery ball valve 271 is controlled to be closed.
Static quality method work flow: the commutator 711 is switched to a state of directly entering the water storage tank 6, and the test water pump 71, the first test ball valve 72, the second test ball valve 75, the electric regulating valve 76, the third test ball valve 77, the fourth test ball valve 79 and the fifth test ball valve 713 are opened to enable the value of the standard flowmeter 3 to reach the used flow. After the above work is completed, the initial values of the electronic scale 5 and the inspected table 1 are recorded, the commutator 711 is switched to enable water to enter the weighing container 4, after a certain amount of water is reached, the commutator 711 is switched to a state of directly entering the water storage tank 6, the numerical values of the electronic scale 5 and the inspected table 1 and the temperature count values are recorded at the same time, and the relevant parameters of the inspected table can be obtained through data processing.
Standard meter method workflow: the third test ball valve 77 is closed, the test water pump 71, the first test ball valve 72, the second test ball valve 75, the electric control valve 76, the third test ball valve 77, the fourth test ball valve 79 and the fifth test ball valve 713 are opened, the electric control valve 76 is adjusted, and when the required flow rate is reached, the detection can be performed, and the value of the standard flow meter 3 is compared with the detected table 1.
Example 2
As shown in fig. 2, in order to provide the high-temperature liquid flow standard device of the present embodiment 2, the hot water storage tank 2 is an open hot water storage tank 2B, and an open water inlet 29 and a hot water thermometer 25 are provided on the open hot water storage tank 2B. When in use, the hot water with the temperature higher than 100 ℃ is directly led into the open hot water storage tank 2B. Except that the structure of the hot water storage tank 2 is different, the rest is the same as that of the embodiment 1, and details of the embodiment 1 will not be described.
The above embodiments of the present invention do not limit the scope of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (2)
1. The high-temperature liquid flow standard device is characterized by comprising a detected meter (1), a hot water storage tank (2), a standard flowmeter (3), a weighing container (4), an electronic scale (5) and a water storage tank (6), wherein,
the detected meter (1) is a flow metering device to be tested, the hot water storage tank (2) is used for storing hot water with the temperature of more than 100 ℃, and the hot water storage tank (2) is communicated with the water storage tank (6) through a test pipeline (7); in the direction from the hot water storage tank (2) to the water storage tank (6), a test water pump (71), a first test ball valve (72), a detected meter (1), a first thermometer (73), a test pressure meter (74), a second test ball valve (75), a standard flow meter (3), an electric regulating valve (76), a third test ball valve (77), a heat exchanger (78), a fourth test ball valve (79), a second thermometer (710), a reverser (711), a third thermometer (712), a weighing container (4) and a fifth test ball valve (713) are sequentially arranged on the test pipeline (7); the cooling water outlet pipeline (8) and the cooling water inlet pipeline (9) of the heat exchanger (78) are both communicated with a cooling water tank (10), and a cooling flow meter (91) and a first circulating water pump (92) are arranged on the cooling water inlet pipeline (9);
one pipeline of the reverser (711) is communicated to the water storage tank (6) through the weighing container (4), and the other pipeline is directly communicated to the water storage tank (6); the weighing container (4) is placed on the electronic scale (5);
the water heater further comprises a first recovery pipeline (11) and a second recovery pipeline (12), wherein the first recovery pipeline (11) is recovered from the water storage tank (6) to the hot water storage tank (2), and a recovery water pump (111) and a recovery check valve (112) are sequentially arranged on the first recovery pipeline (11) according to the recovery direction; the second recovery pipeline (12) is recovered from the test pipeline (7) to the hot water storage tank (2), and a recovery ball valve (121) is arranged on the second recovery pipeline (12);
the hot water storage tank (2) is a sealed heating water storage tank (2A), a circulating heating pipeline (21), a steam adjusting pipeline (22), a pressure controller (23), a pressure release valve (24), a hot water thermometer (25) and a hot water pressure gauge (26), a hot water recovery pipeline (27) and a hot water check valve (28) are communicated with the sealed heating water storage tank (2A),
the circulating heating pipeline (21) returns to the sealed heating water storage tank (2A) from the sealed heating water storage tank (2A) through a second circulating water pump (211) and a heating loop heat exchanger (212), and the hot fluid of the heating loop heat exchanger (212) is steam from a boiler; the steam regulating pipeline (22) sends steam into the sealed heating water storage tank (2A) through a pressure reducing valve (221) and a steam ball valve (222); the hot water recovery pipeline (27) is recovered from the sealed heating water storage tank (2A) to the water storage tank (6), and a hot water recovery ball valve (271) is arranged on the hot water recovery pipeline (27);
the hot water storage tank (2) is an open hot water storage tank (2B), and an open water inlet (29) and a hot water thermometer (25) are arranged on the open hot water storage tank (2B).
2. The high temperature liquid flow standard device according to claim 1, further comprising a controller that controls and connects the pressure controller (23), the pressure release valve (24), the hot water check valve (28), the pressure release valve (221), the steam ball valve (222), the hot water recovery ball valve (271), the test water pump (71), the first test ball valve (72), the second test ball valve (75), the electric control valve (76), the third test ball valve (77), the fourth test ball valve (79), the fifth test ball valve (713), the first circulating water pump (92), the recovery water pump (111), the recovery check valve (112), and the recovery ball valve (121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146407.XA CN108917891B (en) | 2018-09-27 | 2018-09-27 | High-temperature liquid flow standard device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146407.XA CN108917891B (en) | 2018-09-27 | 2018-09-27 | High-temperature liquid flow standard device |
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| Publication Number | Publication Date |
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| CN108917891A CN108917891A (en) | 2018-11-30 |
| CN108917891B true CN108917891B (en) | 2024-02-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110736523B (en) * | 2019-09-20 | 2020-12-01 | 成都秦川物联网科技股份有限公司 | High-low temperature performance test testing device for membrane type gas meter |
| CN110954193B (en) * | 2019-12-27 | 2024-05-17 | 山东省计量科学研究院 | Flow meter durability test device capable of changing temperature and flow rate |
| EP4043843A1 (en) * | 2021-02-16 | 2022-08-17 | Belimo Holding AG | Test stand for liquid flow meters |
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| KR20110122501A (en) * | 2010-05-04 | 2011-11-10 | 신화에이치 주식회사 | A hot water circulation device using the vapor pressure |
| CN203132656U (en) * | 2013-04-01 | 2013-08-14 | 烟台市计量所 | Device for calibrating steam flowmeter by using condensation weighing method |
| CN104458063A (en) * | 2014-12-12 | 2015-03-25 | 合肥瑞纳表计有限公司 | Energy-saving flow calibration device and method of heat meter |
| CN207280638U (en) * | 2017-09-28 | 2018-04-27 | 陕西省计量科学研究院 | A kind of mass method calorimeter automatic calibrator based on M-bus interfaces |
| CN208984179U (en) * | 2018-09-27 | 2019-06-14 | 山东省计量科学研究院 | A kind of high-temp liquid flow standard device |
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2018
- 2018-09-27 CN CN201811146407.XA patent/CN108917891B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110122501A (en) * | 2010-05-04 | 2011-11-10 | 신화에이치 주식회사 | A hot water circulation device using the vapor pressure |
| CN203132656U (en) * | 2013-04-01 | 2013-08-14 | 烟台市计量所 | Device for calibrating steam flowmeter by using condensation weighing method |
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| CN207280638U (en) * | 2017-09-28 | 2018-04-27 | 陕西省计量科学研究院 | A kind of mass method calorimeter automatic calibrator based on M-bus interfaces |
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