U-shaped pipe pressure meter and pressure measurement method thereof

Abstract

The invention discloses a U-shaped pressure meter and a pressure measurement method thereof. In the U-shaped pressure meter, the bottom of the U-shaped pressure meter is communicated with a liquid feed tank through a liquid feed pipe; the right pipe section of a U-shaped pipe extends in the horizontal direction into an overpressure overflow protection tank; the left pipe section of the U-shaped pipe is communicated with a high pressure measurement mouth pipe and a horizontal connection pipe, and a three-way valve is arranged at the joint of the left pipe section of the U-shaped pipe, the highpressure measurement mouth pipe and the horizontal connection pipe; the external end of the horizontal connection pipe is communicated with a horizontal escape pipe and a piston air measurement cylinder, and another three-way valve is arranged at the joint of the external end of the horizontal connection pipe, the horizontal escape pipe and the piston air measurement cylinder; and the volume scale is marked on the left pipe section of the U-shaped pipe. The pressure measurement method comprises the following steps of: disconnecting the high pressure measurement mouth pipe and the U-shaped pipe by the three-way valve; connecting high-pressure gas in the U-shaped pipe and the piston air measurement cylinder; and measuring the volume of high-pressure gas in the U-shaped pipe under normal pressure by using the piston air measurement cylinder and calculating to obtain pressure of the high-pressure gas. The invention has the characteristics that the measurement accuracy does not change along with the rise of pressure, and when the measurement pressure is higher, relative error is smaller.

Description

technical field [0001] The invention belongs to a pressure measurement device and method, in particular to a U-shaped tube pressure gauge and a measurement method for high-pressure gas pressure measurement. Background technique [0002] U-tube pressure gauges are widely used in industrial production, scientific research and other fields due to their simple structure, durable, low price, high sensitivity and high precision. However, the current common U-tube manometers have the following problems in use: 1. Since the height of the liquid column on the high-pressure side and the liquid column on the low-pressure side need to be read, the difference in height of the liquid column is generally about 1m when used. ; If it is necessary to measure the pressure above 20kPa, when water is used as the pressure measuring medium, the height difference of the liquid column is more than 2m, and it is extremely inconvenient to manually read the height of the liquid level at both ends; if o...

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Problems solved by technology

However, the current common U-tube manometers have the following problems in use: 1. Since the height of the liquid column on the high-pressure side and the liquid column on the low-pressure side need to be read, the difference in height of the liquid column is generally about 1m when used. ; If it is necessary to measure the pressure above 20kPa, when water is used as the pressure measuring medium, the height difference of the liquid column is more than 2m, and it is extremely inconvenient to manually read the height of the liquid level at both ends; if only reading the height of the liquid level at one end, due to production and processing Uneven pipe diameters at both ends of the U-shaped tube will lead to large measurement errors; if the pressure measurement medium is changed to a liquid with a higher density than water, such as carbon tetrachloride, tribromomethane, mercury, etc., the liquid pressure during pressure measurement will be reduced. The height of the column is poor, but due to the toxicity of these media, it is usually not recommended to use, or special protection treatment is required to make the price expensive; 2. At present, the addition of the pressure measurement medium of ordinary U-shaped tube manometers is usually added from the top, which is very inconvenient. And it is easy to generate air bubbles or even local gas columns to cause measurement errors; 3. If the measured pressure exceeds the range when the ordinary U-shaped tube pressure gauge is used, the pressure-measured medium in the U-shaped tube will be ejected from the low-pressure measuring port into the measured system, resulting in unnecessary damage or loss

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