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Liquid flow standard calibration device

A verification device and liquid flow technology, which is applied in the field of standard verification devices, can solve the problems of front and back stroke difference, occupy a large space and floor space, and require a lot of investment, and achieve the effects of high verification accuracy, avoiding errors, and avoiding a lot of investment

Inactive Publication Date: 2011-09-14
张广忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the static volume method flow standard verification device is that due to the existence of the water tower and the commutator, the investment required to build a flow standard verification device is large, the space occupied and the ground are large, the height of the water tower (ie pressure) is limited, and the commutator The positive and negative stroke difference makes it difficult to further improve the measurement accuracy of the whole device

Method used

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  • Liquid flow standard calibration device
  • Liquid flow standard calibration device
  • Liquid flow standard calibration device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (Example 1, liquid level gauge detection mode)

[0013] exist figure 1 Among them, the working valve 2 and the verification valve 10 both adopt pneumatic shut-off valves, and a standard pressure gauge 9 is installed on the lower pipe of the standard weighing container 8. When the verification valve is closed and the liquid level in the standard weighing container rises gradually, The change of the liquid level corresponds to the pressure felt by the standard pressure gauge, and the standard pressure gauge can measure the liquid level accordingly.

[0014] The working process of this embodiment: After several verification flow points of the flowmeter 5 to be verified are input into the industrial computer in advance, the entire verification process will be automatically carried out under the control of the industrial computer. At a certain verification flow point, the industrial computer first opens the pneumatic working valve and the pneumatic verification valve, start...

Embodiment 2

[0015] (Example 2, electronic scale detection mode)

[0016] Take the standard weighing container, verification valve and connecting pipe as a whole, and let the weight of this whole act on the electronic scale. When the verification valve is closed, the electronic scale will weigh the change in weight. When the weight reaches the timing start weight Start timing, and stop timing when the weight reaches the end weight of timing. According to the weight difference at the two time points and the timing time obtained by timing, the accurate weight flow rate of the verification flow point can be calculated, and the accurate value is compared with the verification to be carried out. The output signal value corresponding to the flowmeter. An advantage of this embodiment is that weight measurements are generally more accurate than volume measurements.

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Abstract

The invention discloses a liquid flow standard calibration device. The device adopts an overflow structure in a closed container to obtain stable liquid level on which stable high air pressure acts to enable a fluid source of the device to have the advantages of flow stability of a water tower and high Reynolds number of container pressure stabilizing method and to have less fabrication cost and occupied area than those of the water tower method; the device does not need a reverser, and avoids the error caused by unsymmetrical double direction switching process of the reverser; during the calibration, the opening and closing of a valve are not taken as the starting point and terminal point of timing, liquid flowing stays in stable state within timing section, and calibration error mainly depends on the measurement error of the volume or weight of liquid in a standard measuring container, therefore, compared with the calibration device using the reverser, the liquid flow standard calibration device has higher calibration precision.

Description

technical field [0001] The invention relates to a standard verification device in the technical field of flow measurement standards. Background technique [0002] In various industries of the national economy, a large number of various forms of flow metering instruments are used. In order to ensure the accuracy and reliability of the data measured by these flowmeters, regular verification of these flowmeters must be carried out on the flow standard verification device. There are many types of flow standard verification devices, but due to the high requirements on the flow stability of the fluid source during the verification process of the flow meter, the static volume method flow standard verification devices with good flow stability have been widely used. In the static volume method flow standard verification device, the water pump sends the water from the lower pool to the upper pool of the water tower. During the whole verification process, the upper pool is in an overf...

Claims

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Application Information

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IPC IPC(8): G01F25/00
Inventor 张广忠
Owner 张广忠
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