CN102680058B - Movable liquid flux standard device adopting mass method - Google Patents

Abstract

The invention relates to a liquid flow standard device, which belongs to the field of flow detection. A movable mass method liquid flow standard device, including an electronic balance and a water container, is characterized in that it also includes a water supply tank, the water supply tank is connected to the water inlet of the frequency conversion pump, the water outlet of the frequency conversion pump is connected to the pipeline system, and the pipe A check valve is installed on the road system, a filter is installed behind the check valve, a transition vessel is installed behind the filter, a temperature transmitter and a pressure transmitter are installed on the transition vessel, and a flowmeter to be tested is installed behind the transition vessel The variable-diameter installation station, the variable-diameter installation station is connected to the meter clip, the meter clip is connected to the flow regulating valve, and a three-way is set behind the flow regulating valve. One way of the three-way directly returns to the water supply tank, and the other way Connected to the water outlet, the water outlet is arranged directly above the water container on the electronic balance, and the bottom of the water container is provided with a water discharge valve to return to the water supply tank.

Description

Movable mass method liquid flow standard device

technical field

The invention relates to a liquid flow standard device, in particular to a movable mass method liquid flow standard device for small flow.

Background technique

At present, the verification of small liquid flowmeters mainly uses electronic scales to measure the liquid quality and manually cooperate with stopwatches to detect. This method has large human errors, low degree of automation, long measurement time, and low measurement accuracy. The problem is even more pronounced when measuring small flows.

Moreover, the traditional liquid flow standard device has a large volume, is fixed and cannot be moved, and the medium used is tap water. The water density is affected by impurities in the water, and the density value is also unstable, which adversely affects the accuracy of the test results.

Contents of the invention

The technical problem to be solved by the present invention is to provide a movable mass method liquid flow standard device, which solves the defects that the existing liquid flow standard device cannot carry out on-site verification and has low degree of automation in small flow detection.

Technical solutions

A movable mass method liquid flow standard device, including an electronic balance and a water container, is characterized in that it also includes a water supply tank, the water supply tank is connected to the water inlet of the frequency conversion pump, the water outlet of the frequency conversion pump is connected to the pipeline system, and the pipe A check valve is first installed on the road system, and a filter is installed after the check valve to purify the water quality. A transition container is installed after the filter, and a temperature transmitter and a pressure transmitter are installed on the transition container to detect The temperature and pressure of the liquid in the pipeline system. After the transition container, there is a variable-diameter installation station for installing the flowmeter to be tested. After the variable-diameter installation station, it is connected to a meter clip. Set a three-way behind the regulating valve, one of the three-way is directly connected to the water supply tank, and the other is connected to the water outlet, the water outlet is connected to the water container installed on the electronic balance, and the bottom of the water container is provided with a return pipe Connect back to the water supply tank.

Further, a high-precision mass flowmeter is installed between the filter and the variable-diameter installation station where the flowmeter to be tested is installed as a reference standard.

Further, a water inlet solenoid valve is installed before the variable diameter installation station of the liquid flowmeter to be tested, and an additional pipeline system is added after the water inlet solenoid valve before the variable diameter installation station. The system is provided with an installation station for installing a micro-flow liquid flowmeter to be detected, as well as a water outlet and a corresponding water container arranged on the electronic balance.

The bottom of the water container of the added pipeline system is also provided with a return pipe to communicate with the water supply tank.

Further, the variable-diameter installation station adopts a recessed hole in the middle of the flanges at both ends of the fixed liquid flowmeter, and a matching variable-diameter straight pipe is installed in the recessed hole, and one end of the variable-diameter straight pipe is connected to the flange. The concave hole in the middle matches and fixes the end in the concave hole, and the other end is a straight pipe with a diameter that needs to be changed, which is arranged in the middle straight pipe section of the variable diameter installation station. The outer end face of the flange is in the same plane as the end face of the flange.

Further, the flow regulating valve adopts a double-needle valve, which can be adjusted roughly and finely for the flow.

Further, the water container is inclined towards the return pipe at the bottom, and the return pipe is provided with a water discharge valve.

The water storage container is inclined 10 degrees towards the water return pipe.

Further, a wind cover is arranged outside the water outlet of the piping system, the water container and the electronic balance.

Further, it also includes a box body of the device, the water supply tank and the pipeline system are all arranged in the box body of the device, and the bottom of the box body of the device is provided with moving rollers.

Beneficial effect

The mobile mass method liquid flow standard device of the present invention has a small overall volume, is suitable for on-site verification, adopts an automatic cycle design, can realize automatic control measurement, and improves accuracy; two methods of standard meter method and quality method can be used to realize the same set of devices Calibrate the flowmeter; realize the rapid installation of the same pipeline for the flowmeter under test with different calibers.

Description of drawings

Fig. 1 is a schematic diagram of the present invention.

Fig. 2 is a three-dimensional schematic diagram of the single-channel detection of the present invention.

Fig. 3 is a schematic cross-sectional view of a flange at one end of a variable-diameter installation station in the present invention.

Fig. 4 is a schematic diagram of the pipeline of the water outlet in the present invention.

Among them: 1-electronic balance, 2-water container, 3-water supply tank, 4-frequency conversion pump, 5-check valve, 6-filter, 7-transition container, 8-temperature transmitter, 9-pressure changer Conveyor, 10-variable diameter installation station, 11-meter clamp, 12-flow regulating valve, 13-tee, 14-water outlet, 15-high precision mass flowmeter, 16-inlet solenoid valve, 17 -Installation station, 18-flange, 19-variable diameter straight pipe, 20-wind cover, 21-cabinet, 22-moving roller.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

In order to improve the automation of mass method flow detection, a movable mass method liquid flow standard device is designed, including electronic balance 1 and water container 2, and also includes water supply tank 3, water supply tank 3 and frequency conversion pump 4 for water delivery The water inlet is connected, and the water outlet of the frequency conversion pump 4 is connected to the pipeline system. A check valve 5 is firstly installed on the pipeline system, and a filter 6 is installed after the check valve 5 to purify the water quality. A transition valve is installed after the filter 6. Container 7, a temperature transmitter 8 and a pressure transmitter 9 are installed on the transition container 7 to detect the temperature and pressure of the liquid in the pipeline system, after the transition container 7 is provided with a variable diameter sensor for installing a liquid flowmeter to be detected The installation station 10, the variable diameter installation station 10 is connected to the meter clip 11, the meter clip 11 is connected to the flow regulating valve 12, and a three-way 13 is set behind the flow regulating valve 12, and the one-way pipeline system of the three-way 13 is directly Connected to the water supply tank 3, another pipeline system is connected to the water outlet 14, the water outlet 14 is connected to the water container 2 arranged on the electronic balance 1, and the bottom of the water container 2 is provided with a return pipe connected to the water supply tank 3.

A high-precision mass flowmeter 15 is installed between the filter 6 and the variable-diameter installation station 10 where the liquid flowmeter to be tested is installed as a comparison standard table.

A water inlet solenoid valve 16 is installed before the variable diameter installation station 10 of the liquid flowmeter to be tested, and an additional pipeline system is added after the water inlet solenoid valve 16 and before the variable diameter installation station 10. The pipeline system is provided with an installation station 17 for installing a liquid flowmeter with a small flow rate to be detected, as well as a water outlet and a corresponding water container arranged on the electronic balance.

The bottom of the water container of the added piping system is also provided with a return pipe connected to the water supply tank 3 .

The variable-diameter installation station 10 adopts a concave hole in the middle of the flange 18 at both ends of the fixed liquid flowmeter, and a matching variable-diameter straight pipe 19 is installed in the concave hole. The recessed hole in the middle of the blue is matched and fixed to the end in the recessed hole, and the other end is a straight pipe with a diameter that needs to be changed, which is arranged in the middle straight pipe section of the variable diameter installation station 10. The variable diameter straight pipe 19 The outer end face of the end head and the end face of the flange 18 are located in the same plane. The details of the structure of the flange at one end of the variable-diameter installation station are shown in the schematic cross-sectional view of the accompanying drawing 2.

The flow regulating valve 12 adopts a double-needle valve, which can be used for coarse adjustment and fine adjustment of the flow rate, and can realize rapid adjustment of the flow rate.

The water container 2 is inclined to the return pipe at the bottom, and the water container 2 is inclined at 10 degrees to the return pipe, which can automatically drain water by free flow of water. The interior of the water container 2 can be designed with double-layer partitions, and the partitions The hole is opened on the top and the bottom is connected, which will not affect the flow of water and prevent the water from shaking in the container, so that it can be stable as soon as possible and the weighing result is stable.

A wind cover 20 is arranged outside the water outlet 14 of the piping system, the water container 2 and the electronic balance 1 . The high-precision electronic balance 1 is protected by a windshield to improve the stability of the balance and reduce the influence of the airflow in the detection environment on the evaporation of the electronic balance and the working medium.

It also includes a device casing 21, the water supply tank 3 and the pipeline system are all arranged in the device casing 21, and the bottom of the device casing 21 is provided with a moving roller 22.

The mass method small flow standard device is of mobile design with small overall volume and is suitable for on-site verification. The verification device is divided into upper and lower layers, the lower layer is the frequency conversion pump 4 and the water supply tank 3, and the upper layer is the flowmeter verification pipeline.

The device uses distilled water as the working medium, and uses a replaceable filter to ensure the stability of the working medium and improve the uncertainty of the device;

The high-precision mass flowmeter 15 is used as a reference standard meter, so that the same set of devices can be calibrated by the standard meter method and the mass method;

It can adopt double pipelines to be tested, that is, add a pipeline system and install a liquid flowmeter for detection, and can also adapt to different installation methods of the flowmeters to be tested;

The variable-diameter installation station of the flowmeter is used to realize the rapid installation of the same pipeline to the tested flowmeters of different calibers, and the front and rear straight pipe sections meet the requirements of the regulations;

The front and rear straight pipe sections of the tested flowmeter are precisely processed to ensure that they are consistent with the caliber of the tested flowmeter.

The water outlet 14 adopts a downward triangular design to prevent continuous dripping of water. As shown in Figure 3, the triangular design can keep the water in the pipeline system at a certain level, thereby avoiding continuous dripping of water.

The device adopts the variable frequency pump 4 to realize the verification of the flowmeter under different working pressures.

Flow range: (100-5000) ml/min, the expanded uncertainty of the device reaches Urel=0.06% (k=2).

As shown in Figure 1, the working principle of the present invention is:

Start the frequency conversion pump 4, open the water inlet solenoid valve 16, after the distilled water passes through the high-precision mass flowmeter 15, flow to the electronic balance 1 after passing through the tested flowmeter, adjust the verification flow rate, close the water inlet solenoid valve 16, and empty the water container 2, Close the water discharge valve set before the tee 13, and then open the water inlet solenoid valve 16, collect the pulse or instantaneous flow signal of the liquid flowmeter to be tested, record the verification time, and when the verification time is up, close the water inlet solenoid valve 16, and stop collecting the flow At the same time, the mass of the electronic balance 1 is recorded, and the collected mass is corrected by density and buoyancy to calculate the standard flow rate, and the indication value of the liquid flow meter under test is compared with the indication value of the standard flow rate, and the tested liquid flow rate can be obtained. Indication error of the flowmeter.

Frequency conversion pump 4, all solenoid valves or other valves can be connected to the control computer, and the pressure and temperature transmitters installed on the transition vessel 7 are also connected to the control computer, so that automatic control and detection can be realized; double-pipeline design is adopted Adjusting the flow with the double needle valve can also realize multi-range flowmeter detection; adopting the variable diameter installation station of the flowmeter, the flowmeter with different calibers can be quickly replaced for detection, instead of replacing the front and rear straight pipes together.

Claims (8)

1. a packaged type mass method liquid flow standard device, comprise electronic balance (1) and water container (2), it is characterized in that: also comprise water tank (3), water tank (3) is connected with the water inlet of variable frequency pump (4), the water delivering orifice connecting line system of variable frequency pump (4), in pipe system, be first provided with non-return valve (5), after non-return valve (5), be provided with filtrator (6), be used for purifying water, transition container (7) is installed after filtrator (6), temperature transmitter (8) and pressure unit (9) are installed on described transition container (7), the temperature and pressure of liquid in signal piping system, after transition container (7), be provided with the reducing installation station (10) that tested flowmeter is installed, reducing connects meter-clamping apparatus (11) after station (10) is installed, connection traffic variable valve (12) after meter-clamping apparatus (11), a threeway (13) that is provided with water drain valve is above set after flow control valve (12), threeway (13) Yi road is directly communicated with back water tank (3), another road is connected to water delivering orifice (14), described water delivering orifice (14) connection is arranged on the water container (2) on electronic balance (1), described water container (2) bottom is provided with return pipe and is communicated with back water tank (3), the reducing of the tested flowmeter of described installation is installed station (10) entering water electromagnetic valve (16) is installed before, after entering water electromagnetic valve (16), reducing is installed station (10) increases a pipe system before in addition, in described pipe system, be provided with the installation station (17) that tiny flow quantity liquid flowmeter to be detected is installed, and water delivering orifice and the corresponding water container on electronic balance that is arranged on, the casing (21) that also comprises device, described water tank (3) and pipe system are all arranged in the casing (21) of described device, and the casing of described device (21) bottom is provided with shifting roller (22).

2. packaged type mass method liquid flow standard device as claimed in claim 1, is characterized in that: at the reducing of described filtrator (6) and the tested flowmeter of installation, install between station (10) and high precision mass flowmeter (15) conduct is installed with reference to standard.

3. packaged type mass method liquid flow standard device as claimed in claim 1, is characterized in that: the water container bottom of a pipe system of described increase is also provided with return pipe and is communicated with back water tank (3).

4. packaged type mass method liquid flow standard device as claimed in claim 1 or 2, it is characterized in that: described reducing is installed station (10) and adopted the middle shrinkage pool that has of flange (18) at the two ends of immobile liquid flowmeter body, the reducing straight tube (19) of coupling is installed in shrinkage pool, described reducing straight tube one end is mated and is fixed on the termination in shrinkage pool for the shrinkage pool with in the middle of flange, the other end is the straight tube that requires the diameter of change, being arranged on reducing installs in the straight length of centre of station (10), the end face of the outer face of the termination of described reducing straight tube (19) and flange (18) is positioned at same plane.

5. packaged type mass method liquid flow standard device as claimed in claim 1 or 2, is characterized in that: described flow control valve (12) adopts crosspointer valve, can carry out coarse adjustment and fine setting for flow.

6. packaged type mass method liquid flow standard device as claimed in claim 1 or 2, is characterized in that: the return pipe of described water container (2) towards bottom is obliquely installed, and is provided with water drain valve on return pipe.

7. packaged type mass method liquid flow standard device as claimed in claim 6, is characterized in that: water container (2) arranges towards return pipe inclination 10 degree.

8. packaged type mass method liquid flow standard device as claimed in claim 1 or 2, is characterized in that: at the water delivering orifice (14) of described pipe system and water container (2) and electronic balance (1), be outside equipped with fan housing (20).

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