A first-class standard metal measure

Abstract

The invention discloses a first-class standard metal measuring instrument, the main body of which is formed by connecting the upper part of the measuring instrument and the lower part of the measuring instrument. The top of the upper part of the measuring instrument is connected with an overflow device. The overflow device includes a and the casing of the overflow pipe, the upper opening of the overflow pipe is set in the casing and is not lower than the water outlet at the top of the gauge, the lower opening of the overflow pipe is set outside the casing; there is also a Bending, the bending position is lower than the water outlet at the upper top of the measuring device, and an overflow hole is arranged at the bending position. The overflow device adopted in the present invention avoids the error caused by artificially observing the liquid level scale of the metering neck, and improves the measurement accuracy; it is easier to process and transport, and it is convenient to disassemble the measuring device for cleaning; the measurement accuracy and repeatability are improved, and the annular hard seal is more accurate. It is easy to ensure the sealing performance; the imported three-way valve is used to avoid the error caused by the switching valve; the platinum resistance temperature measuring device is used, which has the advantages of high precision and short response time.

Description

technical field [0001] The invention relates to a first-class standard metal measuring device, in particular to a first-class metal measuring device with a main cylinder separated. Background technique [0002] The standard metal gauge is a standard measuring instrument used to measure the volume of a liquid, and can be used as a measuring instrument for transferring volume values. It is widely used in flow measurement verification and calibration devices, and is one of the important equipment for performance testing of flowmeters in manufacturing and scientific research. [0003] The first-class standard metal gauge is a standard measuring instrument for measuring liquids. It is a standard measuring device that must be equipped when measuring high-precision volumes. accuracy. The liquid level scale value of the nominal capacity corresponds to the nominal capacity value at 20°C. The liquid level scale of the nominal capacity is generally located in the middle of the meter...

AI Technical Summary

Problems solved by technology

This kind of metal measuring instrument is to observe the coincidence degree of the liquid level and the scale line with the naked eye. Due to the different viewing angles, there are human visual errors, which will lead to low measurement accuracy.

In addition, the existing first-class metal gauges also have the following disadvantages: 1. The liquid level tube will be dirty after a long time of use, and this extremely slender liquid level tube is very inconvenient to clean, and even if it is dirty, it can only be replaced , which increases the cost of the measuring device; 2. The water supply and drainage valve under the lower cone is a self-made three-way valve, which has disadvantages such as low precision, long switch response time, and lax closing; 3. Using mercury thermometer readings, it will Affected by ambient temperature and human factors, errors are caused, and the accuracy is not high; 4. The overall welding structure will cause inevitable permanent deformation during processing, and the phenomenon of wall hanging after the measuring device is drained, which will affect the repeatability of the measuring device 5. Commonly used stainless steel is used as the material. If this stainless steel is placed in the atmosphere for a long time, it is easy to oxidize with the acidic substances in the air.

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