CN110954193A - Variable-temperature and variable-flow flowmeter durability test device - Google Patents
Variable-temperature and variable-flow flowmeter durability test device Download PDFInfo
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Abstract
The invention discloses a variable-temperature variable-flow flowmeter durability test device which comprises a to-be-tested meter, a test pipeline, two water storage tanks, two water pumps, two sets of flow regulating devices and two sets of temperature and pressure monitoring devices, wherein the to-be-tested meter is communicated with the test pipeline; the test pipeline adopts a double-row design parallel operation structural form, the test pipeline adopts a double-row structural form at a test section of the flow metering device, and the front section of the test section and the rear end of the test section are provided with the flow three-way switching valve. The durability test device of the flow metering device is simple in structure and small in occupied space; the durability test device of the flow metering device can complete a constant-temperature variable-flow durability test and can also complete a constant-flow variable-temperature durability test; when the durability test device of the flow metering device runs a constant-temperature variable-flow durability test, the test efficiency of the device is doubled; the durability test device of the flow meter can save more than 50% of energy when running a constant flow and temperature change durability test.
Description
Technical Field
The invention relates to the technical field of metering, in particular to a variable-temperature variable-flow durability test device of a flow metering appliance.
Background
The calorimeter is a flowmeter for measuring the heat quantity supplied by a heating system using hot water as a medium, and the calorimeter mainly comprises a calculator, a temperature sensor and a flow sensor. The flow sensor measures the amount of water flowing through, the temperature sensor is matched to sense the temperature of the water supply pipe and the water return pipe, and the calculator acquires the three signals and then obtains the heat value according to the specified medium pressure and the like, so that the heat meter is a key metering device for heat supply trade settlement in the heat supply field. The test qualification rate of the conventional project reaches more than 98%, but the evaluation of the long-term use reliability of the product is always the core problem of continuous research in the industry, namely whether the heat meter product can maintain stable metering performance in long-term use. For this reason, europe has already had an effective test method for reference, and 4000 high-temperature and low-temperature cycle tests performed on a temperature sensor: the 2 temperature points are one cycle (5min), 4000 cycles (333.3h), high load (80-85) DEG C, duration: 2.5min, low load (15-20) DEG C, duration: 2.5min, the temperature alternation time is less than or equal to 1 min; the test for the flow sensor is a 2400h variable flow cycle test: 1.5qi、qp、qs、qp、1.5qiAnd (4) operating according to the specified time under the condition of equal flow, and finishing the stable switching to the next flow within 15min at the operation end. In the temperature or flow switching stage, the fluctuation deviation of the working condition instantaneous flow and the standard instantaneous flow is +/-10 percent; and in the stable operation stage, the flow fluctuates by +/-5 percent.
Aiming at the two test modes, the development of equipment capable of realizing the durability test of the heat meter (flow meter) at variable flow and variable temperature becomes an important subject in the heat metering industry.
In China, the 2400h test mode is brought into the GB/T32224-2015 calorimeter standard, so that devices for testing the 2400h test capacity are researched in China mostly, and the technical difficulty of the devices is that flow switching is stable in a specified time, and pressure fluctuation is small enough in variable flow. The device developed by each family in China generally adopts the traditional frequency converter control technology in the technical parameter control, the opening of the valve body is adjusted, the regulation of the flow is completed, the data collected in the test process is displayed, and the flow fluctuation range is 4-6%. The disadvantage is that the variable flow control is not fine enough.
The 4000 times of test modes are included in a newly revised EN1434-2016 heat meters standard, the national standard is not mentioned, but part of enterprises start to develop the device due to the fact that products are in contact with the international rail, and at present, two design schemes exist in China: 1. the test device is characterized in that two independent power circulation systems are designed according to high-temperature and low-temperature loads, one power circulation system is a high-temperature medium, the other power circulation system is a low-temperature medium, when one power circulation system performs a load test on a sample, the other power circulation system performs idle standby at the same flow rate, when the working period of 2.5min is reached, switching of high-temperature and low-temperature test media is completed through rapid switching of a valve body, and the utilization rate of the designed test device is 50%; 2. the whole equipment is provided with a power circulation system and a heating and refrigerating system with enough power, the medium is switched between (15-20) DEG C and (80-85) DEG C within 1min, the high-temperature operation at 80 ℃ is carried out for 2.5min, the refrigerating system is started, the water temperature is reduced to 20 ℃ within 1min, the low-temperature operation is carried out for 2.5min, the heating system is started, the water temperature is increased to 80 ℃ within 1min, the next cycle is carried out, and the steps are repeated in this way, so that the 4000 cycles are completed. The design has the following disadvantages: refrigeration and heating are frequently switched to cause great waste of energy, and a pipeline system, a monitoring instrument, a standard meter and the like in the whole cycle perform high and low temperature tests along with a test sample meter in one period, so that not only is great waste of energy caused, but also aging and easy damage are caused to the pipeline and the instrument due to temperature impact.
Aiming at the actual situation and the test requirement, the durability test device for the flowmeter with variable temperature and variable flow is developed, and the practical, low-energy and effective test mode for realizing the variable flow and variable temperature of the heat meter becomes the important content of the invention.
Disclosure of Invention
The durability test device of the flow metering device provided by the invention completes 2400h and 4000 times of test modes on one set of equipment; according to the durability test device of the flow metering appliance, the flow control adopts a mode of combining frequency conversion speed regulation, valve body opening, software control and data pre-operation, so that the stable switching of the maximum flow and the minimum flow ratio within a measuring range of 67 and within 1min is completed, and the control and the metering of the flow stability of operation data and a test link are realized; according to the durability test device for the flow metering instrument, the high-low temperature medium adopts a design mode that double rows of cold and hot pipelines are parallel, and the cold and hot exchange independent circulation is completed by switching the front valve and the rear valve of the tested sample table, so that the temperature is switched between 20 ℃ and 85 ℃, the temperature of the medium flowing through the water pump and the standard flow meter group is not alternated, one set of device has two test modes, the utilization rate of the test device is improved, and the energy consumption of temperature rise and temperature reduction is reduced.
The durability test device of the flow metering device comprises two sets of power circulation systems, wherein when a 2400h mode test is carried out, the two sets of power circulation systems of the whole device form two completely independent test systems which are respectively subjected to test operation; when 4000 times of mode tests are carried out, the two sets of power circulation systems of the whole device form a high-temperature operation system and a low-temperature operation system, high and low-temperature media are switched before and after a tested meter, and the tested meter with double rows of pipelines realizes high and low temperature impact circulation tests.
Each set of power cycle comprises a detected meter, an annular test pipeline and a circulating water storage tank, wherein the detected meter is a tested flow metering device and is communicated with the annular test pipeline; the annular test pipeline penetrates through the circulating water storage tank, and an electric heating assembly is arranged on the circulating water storage tank and used for heating water; the annular test pipeline is also communicated with a standard flowmeter, a test water pump, a flow regulating valve and a temperature measuring meter; and each power cycle completes the test operation of the detected meter corresponding to the power cycle through the switching of electromagnetic valves at the front end and the rear end of the detected meter.
Optionally, a pressure measuring instrument is further communicated with the annular test pipeline.
Optionally, the meter under test communicates with the annular test line through a connection fitting.
Optionally, the system further comprises a controller, and the controller is connected with the test water pump, the flow regulating valve, the water inlet pump and the water discharge pump in a control mode.
The invention has the following beneficial effects:
1. two test modes of 2400h and 4000 times of temperature cycle are realized on one set of device: see example 1 for a description.
2. Greatly reduced energy consumption of variable temperature test
The heat quantity calculation method comprises the following steps:
in the formula: v is the volume of the heat carrier in the heat exchange system
Delta theta is the temperature variation difference of the heat-carrying liquid in the heat exchange system
k is a thermal coefficient
The analysis is simplified, the heat exchange system does not generate heat loss, and according to the law of energy conservation, the temperature rise and the temperature fall between 20 ℃ and 80 ℃ to absorb and release energy are the same. Namely, it is
Q＝k×V×Δθ；
Temperature rise and fall period: t is 2.5 min;
heating power of the heating device: p is Q/T is k multiplied by V multiplied by delta theta/T;
refrigerating power of the refrigerating device: p is Q/T is k multiplied by V multiplied by delta theta/T;
the device is designed as a water storage tank energy consumption calculation: the energy consumed for completing the temperature cycle of one test is the sum of the heat absorbed by temperature rise and the energy released by temperature decrease, namely Q1＝2×k×V1X delta theta, wherein the design volume of the tank V1＝0.0925m3And the energy Q required for 4000 times of temperature change circulation is completedGeneral 1＝740kΔθ；
The invention designs two water storage tanks with the same volume (92.5L), one water storage tank is a medium at 20 ℃ and the other water storage tank is a medium at 80 ℃, the temperature of each water storage tank medium in the test maintains a corresponding temperature index, and the high-temperature and low-temperature switching is realized in front of and behind the test apparatus, so that the energy required by heating or cooling is the sum of the energy required by heating and cooling the medium in the test pipe section.
DN20 test sample is shown as an example: the number of the clamp meters is 9, the middle pipe section is 5cm, the distance between the switching valve and the test sample meter is 35cm, and the medium volume of the pipe section is as follows: v2＝(9×0.13+8×0.05+2×0.35)×3.14×0.01×0.01＝0.00072m34000 times of circulation supply and demand energy QGeneral 2＝2×k×V2×Δθ×4000＝5.8kΔθ
By adopting the double-row pipeline design, the operating temperature alternating amplitude can reach more than 60 ℃, and the alternating time is less than or equal to 1 min. The total energy consumption of temperature conversion is 740 kDelta theta without adopting the invention, and the total energy consumption is reduced to 5.8 kDelta theta by adopting the invention, thereby realizing the low energy consumption control of constant flow quantity variable temperature.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a schematic structural diagram of a variable-temperature variable-flow flowmeter durability test device provided by the invention.
In fig. 1, the reference numerals denote: 108-a first detected meter, 208-a second detected meter, 110-a first test pipeline, 210-a second test pipeline, 121-a first water storage tank, 221-a second water storage tank, 114-a first standard flowmeter, 115-a second standard flowmeter, 214-a third standard flowmeter, 215-a fourth standard flowmeter, 103-a water pump A, 203-a water pump B, 116-a first flow regulating valve, 117-a second flow regulating valve, 216-a third flow regulating valve, 217-a fourth flow regulating valve, 106-a temperature sensor A, 111-a temperature sensor B, 119-a first temperature sensor, 206-a temperature sensor C, 211-a temperature sensor C, 219-a second temperature sensor, 101-a first water outlet, 201-a second water outlet, 118-a first water return port, 218-a second water return port, 105-a three-way valve A, 113-a three-way valve B, 205-a three-way valve C, 213-D, a three-way valve A, 113-a three-way valve B, 121-a three-, 104-frequency converter a, 204-frequency converter B, 107-pressure sensor a, 112-pressure sensor B, 207-pressure sensor C, 212-pressure sensor D, 109-first clamping device, 209-second clamping device, 001-controller, 120-first electric heating assembly, 220-second electric heating assembly, 102-ball valve a, 202-ball valve B, 222-refrigerator
Detailed Description
The invention provides a variable-temperature variable-flow flowmeter durability test device, which realizes two test modes of constant-temperature variable-flow and constant-flow variable-temperature, has the lowest heating and refrigerating power and saves energy.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The durability test device for the variable-temperature and variable-flow flowmeter provided by the embodiment 1 comprises a first to-be-tested meter 108, a second to-be-tested meter 208, a first annular test pipeline 110, a second test pipeline 210, a first water storage tank 121 and a second water storage tank 221. Specifically, the first and second tables 108 and 208 are flow meters to be tested, such as heat meters. The first tested meter 108 and the second tested meter 208 can be directly communicated with the first annular test pipeline 110 and the second annular test pipeline 210, and the first tested meter 108 and the second tested meter 208 are respectively communicated in the first test pipeline 110 and the second test pipeline 210 by the first clamping device 109 and the second clamping device 209.
The first meter under test 108 is a flow meter under test, and is disposed in communication with the first test line 110; the first test pipeline 110 starts from the water outlet 101 of the first water storage tank 121 and ends at the water return port 118 of the first water storage tank 121, and a first electric heating component 120 is arranged on the first water storage tank 121 and used for heating a test medium; a first temperature sensor 119 is arranged on the first water storage tank 121;
the second meter under test 208 is a flow meter under test, and is disposed in the second test pipeline 210 in a communicating manner; the second test pipeline 210 starts from the water outlet 201 of the second water storage tank 221 and ends at the water return port 218 of the second water storage tank 221, and a second electric heating assembly 220 is arranged on the second water storage tank 221 and used for heating a test medium; the second water storage tank 221 is provided with a refrigerator 222 for cooling the test medium; a second temperature sensor 219 is arranged on the second water storage tank 221;
the first test pipeline 110 is also provided with a first standard flowmeter 114 and a second standard flowmeter 115 in parallel communication, and the first standard flowmeter 114 and the second standard flowmeter 115 are respectively connected with a first flow regulating valve 116 and a second flow regulating valve 117; the first test pipeline 110 is also provided with a temperature measurement meter A106 and a temperature measurement meter B111 which are respectively arranged at two sides of the first detected meter 108;
the second test pipeline 210 is also provided with a third standard flowmeter 214 and a fourth standard flowmeter 215 in parallel communication, and the third standard flowmeter 214 and the fourth standard flowmeter 215 are respectively connected with a third flow regulating valve 216 and a fourth flow regulating valve 217; the second test pipeline 210 is further provided with a temperature measurement meter C206 and a temperature measurement meter D211 which are respectively arranged at two sides of the second detected meter 208.
The first test pipeline 110 is also provided with a pressure sensor A112 and a pressure sensor B107 in a communicating manner, and the pressure sensor A112 and the pressure sensor B107 are respectively arranged at two sides of the first detected meter 108;
the second test pipeline 210 is further provided with a pressure sensor C212 and a pressure sensor D207 in a communicating manner, and the pressure sensor C212 and the pressure sensor D207 are respectively arranged on two sides of the second detected meter 208.
The controller 001 is connected with a water pump, an electric regulating valve, a three-way valve, a temperature sensor, a pressure sensor and a standard flowmeter.
The first standard flowmeter 114 and the second standard flowmeter 115 are used in parallel, the wide range of the upper flow limit and the lower flow limit of the sample meter is covered, and the range ratio can reach 67: 1; the third standard flowmeter 214 and the fourth standard flowmeter 215 are used in parallel, the wide range of the upper flow limit and the lower flow limit of the sample meter is covered, and the range ratio can reach 67: 1.
A ball valve A102, a water pump A103, a frequency converter A104 and a three-way valve A105 are sequentially arranged on one side of the water outlet of the first water storage tank 121; a ball valve B202, a water pump B203, a frequency converter B204 and a three-way valve B205 are sequentially arranged on one side of the water outlet of the second water storage tank 221;
the three-way valve A105 is positioned behind the water pump A103; the three-way valve B113 is located before the first meter standard 114 and the second meter standard 115; the three-way valve C205 is positioned behind the water pump B203; the three-way valve D213 is located before the third and fourth standard flow meters 214 and 215; the influence of water temperature change on a water pump and a standard flowmeter in a constant flow variable temperature durability experiment is avoided.
The water pump A103 inputs frequency through the frequency converter A104 to regulate flow; the water pump B203 inputs frequency through the frequency converter B204 to regulate the flow.
And calculating the heat quantity Q absorbed or released by 1 ℃ when the temperature rises or falls according to the specification of the tested sample table by a pipeline between the three-way valve A105 and the three-way valve B113 and a pipeline between the three-way valve C205 and the three-way valve D213, and determining the refrigerating power.
The first flow regulating valve 116, the second flow regulating valve 117, the third flow regulating valve 216 and the fourth flow regulating valve 217 realize the control of flow regulation by setting the opening degree.
The device pre-operates, the controller 001 sets the opening of the electric regulating valve and the frequency of the frequency converter in sequence, collects data corresponding to the standard flowmeter and the pressure measuring instrument, forms a pre-operation database of frequency, opening, pressure and flow, and stores data for operating the steady flow.
The first annular test pipeline 110 and the second annular test pipeline 210 are further provided with a first standard flow meter 114, a second standard flow meter 115, a third standard flow meter 214, a fourth standard flow meter 215, a water pump A103, a water pump B203, a first flow regulating valve 116, a second flow regulating valve 117, a third flow regulating valve 216, a fourth flow regulating valve 217, a temperature measuring meter A106, a temperature measuring meter B111, a first temperature sensor 119, a temperature measuring meter C206, a temperature measuring meter D211, a second temperature sensor 219, a pressure sensor A107, a pressure sensor B112, a pressure sensor C207 and a pressure sensor D212 in a communicating manner. The first standard flowmeter 114 and the second standard flowmeter 115 form a standard meter group, wherein the first standard flowmeter controls the large, medium and small flow of the first test pipeline 110 of the loop, and the second standard flowmeter measures the accuracy of the first detected meter 108, so that the durability of the first detected meter 108 is evaluated; the third standard flowmeter 214 and the fourth standard flowmeter 215 form a standard meter group, which is used for controlling the large, medium and small flow rates of the second test pipeline 210 of the loop and measuring the accuracy of the second detected meter 208, so as to evaluate the durability of the second detected meter 208. The test water pump a103 is used for opening or closing the first annular test pipeline 110, that is, opening or ending the durability test on the first meter under test 108; the first flow regulating valve 116, the second flow regulating valve 117, the temperature measuring meter a106, the temperature measuring meter B111, the first temperature sensor 119, the pressure sensor a107 and the pressure sensor B112 are respectively used for regulating the flow of the first annular test pipeline 110 and measuring the temperature and the pressure of water in the first annular test pipeline 110. The test water pump B203 is used for opening or closing the second annular test pipeline 210, i.e. opening or ending the durability test on the second inspected meter 208; the third flow regulating valve 216, the fourth flow regulating valve 217, the temperature measuring meter C206, the temperature measuring meter D211, the second temperature sensor 219, the pressure sensor C207, and the pressure sensor D212 are respectively used for regulating the flow of the second annular test pipeline 210 and measuring the temperature and the pressure of the water in the second annular test pipeline 210.
The durability test device of the flow meter is controlled by a controller 001, and the controller 001 is connected with the test water pumps 103 and 203, the electric control valves 116, 117, 216 and 217, the standard flow meters 114, 115, 214 and 215, the three- way valves 105, 205, 113 and 213, the frequency converters 104 and 204, the heating devices 120 and 220 and the refrigerator 222.
Constant temperature variable flow circulation: two independent cycles are performed in parallel in the test, which is equivalent to two sets of devices.
The device 1: the medium is communicated with a first to-be-detected meter 108 in a first water storage tank 121 through a first water outlet 101 and a water pump A103, a first standard flowmeter 114 and a second standard flowmeter 115 are respectively communicated with a first test pipeline 110, the first standard flowmeter 114 and the second standard flowmeter 115 are respectively communicated with a first flow regulating valve 116 and a second flow regulating valve 117, a second standard flowmeter 115 channel is selected for large and medium flow, a first standard flowmeter 114 channel is selected for small flow, and the medium is circulated back to the first water storage tank 121 through a first water return port 118 of the first test pipeline 110. A first electric heating component 120 is arranged on the circulating first water storage tank 121 and used for heating a test medium;
the device 2: the medium is communicated with a second to-be-detected meter 208 in a second water storage tank 221 through a second water outlet 201 and a water pump B203, a second test pipeline 210 is respectively communicated with a third standard meter 214 and a fourth standard meter 215, the third standard meter 214 and the fourth standard meter 215 are respectively communicated with a third flow regulating valve 216 and a fourth flow regulating valve 217, a fourth standard meter 215 channel is selected for large and medium flow, a third standard meter 214 channel is selected for small flow, and the medium is circulated back to the second water storage tank 221 through a second water return port 218 of the second test pipeline 210; a second electric heating component 220 is arranged on the second water storage tank 221 and used for heating a test medium;
the first and second storage tanks 121 and 221 store an amount of water sufficient to fill the first and second test lines 110 and 210;
in test operation, the water temperatures of the first water storage tank 121 and the second water storage tank 221 are constant at 90-95 ℃, and the flow rates are periodically changed.
Constant flow and temperature change circulation: the test is carried out by alternately cycling the test tube section at high and low temperatures, which is equivalent to a set of equipment. The first water storage tank 121 is high in temperature and medium temperature is 80 ℃, the second water storage tank 221 is provided with a refrigerator 222 and is low in temperature and medium temperature is 20 ℃; the flow of the tested meter is constant, the high temperature and the low temperature respectively last for 2.5min, the temperature change is completed within 1min, and 5min is a complete cycle. For convenience of description, the 5min period is divided into three stages: 1. 2.0min stable operation stage, 2, 1min high and low temperature switching stage, and 3, 2.0min stable operation stage.
2.0min steady operation stage: the medium flows through the first water outlet 101 of the first water storage tank 121, the water pump A103, the three-way valve A105, the first detected meter 108, the three-way valve D113, the first standard flow meter 114 or the second standard flow meter 115 and returns to the first water storage tank 121 through the first water return port 118; meanwhile, the medium flows through a second water outlet 201 of the second water storage tank 221, a water pump B203, a three-way valve C205, a second detected meter 208, a three-way valve D213, a third standard flow meter 214 or a fourth standard flow meter 215 and returns to the second water storage tank 221 through a second water return port 218; the first detected meter 108 is communicated with a high-temperature medium for 2.0min, and the second detected meter 208 is communicated with a low-temperature medium for 2.0 min;
1.0min high and low temperature switching stage, wherein the medium flows through the first water outlet 101 of the first water storage tank 121, the water pump A103, the three-way valve A105 and the three-way valve A105, flows through the second detected meter 208, is switched through the three-way valve D213 and the three-way valve D213, and returns to the first water storage tank 121 through the first standard flowmeter 114 or the second standard flowmeter 115 and the first water return port 118; meanwhile, the medium is switched by a second water outlet 201 of the second water storage tank 221, a water pump B203, a three-way valve C205 and the three-way valve C205, flows through the first detected meter 108, the three-way valve B113 and the three-way valve B113, and returns to the second water storage tank 221 through a second water return port 218 by a third standard flow meter 214 or a fourth standard flow meter 215; the first table 108 to be detected switches low-temperature media, and the second table 208 to be detected switches high-temperature media; and after the switching is stable, the operation is continued for 2.0 min. And completing a cycle of one period and entering the next period.
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 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 will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. The utility model provides a variable temperature becomes flowmeter durability test device of flow volume which characterized in that, includes first examined table (108), second examined table (208), first test pipeline (110), second test pipeline (210), first storage water tank (121) and second storage water tank (221), wherein:
the first to-be-detected meter (108) is a to-be-tested flow measuring instrument and is communicated with the first test pipeline (110); the first test pipeline (110) starts from a water outlet (101) of a first water storage tank (121) and ends at a water return port (118) of the first water storage tank (121), and a first electric heating component (120) is arranged on the first water storage tank (121) and used for heating a test medium; a first temperature sensor (119) is arranged on the first water storage tank (121);
the second tested meter (208) is a tested flow measuring instrument and is communicated with the second test pipeline (210); the second test pipeline (210) starts from a water outlet (201) of a second water storage tank (221) and ends at a water return port (218) of the second water storage tank (221), and a second electric heating component (220) is arranged on the second water storage tank (221) and used for heating a test medium; the second water storage tank (221) is provided with a refrigerator (222) for cooling a test medium; a second temperature sensor (219) is arranged on the second water storage tank (221);
the first test pipeline (110) is also provided with a first standard flowmeter (114) and a second standard flowmeter (115) in a parallel communication mode, and the first standard flowmeter (114) and the second standard flowmeter (115) are respectively connected with a first flow regulating valve (116) and a second flow regulating valve (117); the first test pipeline (110) is also provided with a temperature measurement meter A (106), and a temperature measurement meter B (111) which are respectively arranged at two sides of the first detected meter (108);
the second test pipeline (210) is also provided with a third standard flowmeter (214) and a fourth standard flowmeter (215) in a parallel communication mode, and the third standard flowmeter (214) and the fourth standard flowmeter (215) are respectively connected with a third flow regulating valve (216) and a fourth flow regulating valve (217); the second test pipeline (210) is also provided with a temperature measuring meter C (206), and a temperature measuring meter D (211) are respectively arranged at two sides of the second detected meter (208).
2. The durability test device of the flow meter according to claim 1, wherein the first test pipeline (110) is further provided with a pressure sensor A (112) and a pressure sensor B (107) in a communication manner, and the pressure sensor A (112) and the pressure sensor B (107) are respectively arranged on two sides of the first to-be-detected meter (108);
and the second test pipeline (210) is also provided with a pressure sensor C (212) and a pressure sensor D (207) in a communicated manner, and the pressure sensor C (212) and the pressure sensor D (207) are respectively arranged at two sides of the second to-be-detected meter (208).
3. The durability test device of the flow meter instrument according to claim 1, wherein the controller (001) is connected with a water pump, an electric control valve, a three-way valve, a temperature sensor, a pressure sensor and a standard flow meter.
4. The durability test device of the flow meter instrument according to the claim 1, characterized in that the first standard flowmeter (114) and the second standard flowmeter (115) are used in parallel, covering wide range of the upper flow limit and the lower flow limit of the sample meter, the range ratio can reach 67: 1; the third standard flowmeter (214) and the fourth standard flowmeter (215) are used in parallel, the wide range of the upper flow limit and the lower flow limit of the sample meter is covered, and the range ratio can reach 67: 1.
5. The durability test device of the flow meter according to claim 1, wherein a ball valve A (102), a water pump A (103), a frequency converter A (104) and a three-way valve A (105) are sequentially arranged on the water outlet side of the first water storage tank (121); a ball valve B (202), a water pump B (203), a frequency converter B (204) and a three-way valve B (205) are sequentially arranged on one side of the water outlet of the second water storage tank (221);
the three-way valve A (105) is positioned behind the water pump A (103); the three-way valve B (113) is positioned in front of the first standard flowmeter (114) and the second standard flowmeter (115); the three-way valve C (205) is positioned behind the water pump B (203); the three-way valve D (213) is positioned before the third standard flow meter (214) and the fourth standard flow meter (215); the influence of water temperature change on a water pump and a standard flowmeter in a constant flow variable temperature durability experiment is avoided.
6. The durability test device of the flow meter according to claim 1, wherein the water pump A (103) performs flow rate adjustment by inputting a frequency through a frequency converter A (104); and the water pump B (203) inputs frequency through the frequency converter B (204) to regulate the flow.
7. The durability test device of the flow meter according to claim 1, wherein the device is operated in advance, the controller (001) sets the opening degree of the electric regulating valve and the frequency of the frequency converter in sequence, collects data corresponding to the standard flow meter and the pressure measuring instrument, and forms a frequency, opening degree, pressure and flow pre-operation database to store data for operating steady flow.
8. The durability test device of the flow meter appliance according to claim 1, characterized in that the constant temperature variable flow test is equivalent to two sets of independent operation devices;
the device 1: the medium is communicated with a first detected meter (108) through a first water outlet (101) and a water pump A (103) in a first water storage tank (121), a first test pipeline (110) is respectively communicated with a first standard flowmeter (114) and a second standard flowmeter (115), the first standard flowmeter (114) and the second standard flowmeter (115) are respectively communicated with a first flow regulating valve (116) and a second flow regulating valve (117), a second standard flowmeter (115) channel is selected for medium and large flows, a first standard flowmeter (114) channel is selected for small flows, and the medium is circulated back to the first water storage tank (121) through a first water return port (118) of the first test pipeline (110). A first electric heating component (120) is arranged on the circulating first water storage tank (121) and used for heating a test medium;
the device 2: a medium is communicated with a second detected meter (208) in a second water storage tank (221) through a second water outlet (201) and a water pump B (203), a second test pipeline (210) is respectively communicated with a third standard meter (214) and a fourth standard meter (215), the third standard meter (214) and the fourth standard meter (215) are respectively communicated with a third flow regulating valve (216) and a fourth flow regulating valve (217), a fourth standard meter (215) channel is selected for large and medium flow, a third standard meter (214) channel is selected for small flow, and the medium is circulated back to the second water storage tank (221) through a second water return port (218) of the second test pipeline (210); a second electric heating component (220) is arranged on the second water storage tank (221) and used for heating the test medium;
the first water storage tank (121) and the second water storage tank (221) store enough water to fill the first test pipeline (110) and the second test pipeline (210);
in test operation, the water temperatures of the first water storage tank (121) and the second water storage tank (221) are constant at 90-95 ℃, and the flow rates are changed periodically.
9. The durability test device for flow rate measuring instrument according to claim 1, wherein the constant flow rate and the variable temperature cycle, the variable temperature cycle is switched before and after the sample to be tested, the device is equivalent to a set, and the variable temperature operation is described as follows:
2.0min steady operation stage: the medium flows through a first water outlet 101 of a first water storage tank (121), a water pump A (103), a three-way valve A (105), a first detected meter (108), a three-way valve D (113), a first standard flow meter (114) or a second standard flow meter (115) and returns to the first water storage tank (121) through a first water return port (118); meanwhile, the medium flows through a second water outlet (201) of a second water storage tank (221), a water pump B (203), a three-way valve C (205), a second detected meter (208), a three-way valve D (213), a third standard flow meter (214) or a fourth standard flow meter (215) and returns to the second water storage tank (221) through a second water return port (218); the first detected meter (108) is communicated with a high-temperature medium for 2.0min, and the second detected meter (208) is communicated with a low-temperature medium for 2.0 min;
1.0min high-low temperature switching stage, namely, a medium passes through a first water outlet (101) of a first water storage tank (121), a water pump A (103), a three-way valve A (105) is switched, flows through a second detected meter (208), a three-way valve D (213) and a three-way valve D (213) are switched, and the medium returns to the first water storage tank (121) through a first standard flow meter (114) or a second standard flow meter (115) through a first water return port (118); meanwhile, the medium flows through a second water outlet (201) of a second water storage tank (221), a water pump B (203), a three-way valve C (205), the three-way valve C (205) is switched to flow through a first detected meter (108), the three-way valve B (113) and the three-way valve B (113) are switched, and the medium returns to the second water storage tank (221) through a second water return port (218) through a third standard flow meter (214) or a fourth standard flow meter (215); the first detected table (108) switches low-temperature media, and the second detected table (208) switches high-temperature media; and after the switching is stable, the operation is continued for 2.0 min. And completing a cycle of one period and entering the next period.
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