UA15732U - Rotameter - Google Patents

Abstract

The proposed rotameter contains a glass conical tube with flanges, safety inserts, which are installed between the tube and the flanges, a float, which is installed in the tube, and two limit stops for the float.

Description

Description of the invention

The useful model belongs to measuring equipment, in particular to devices for measuring the volume flow of liquids and gases.

The most common devices of the group of constant pressure drop flowmeters are rotameters - flowmeters with a float that moves in the device body (Industrial automation tools. Part 1. Measuring devices / Edited by A.K. Babchenko. - Kharkiv: NTU "KhPI", 2001 - P.179). Thus, there is a well-known rotameter containing a glass conical tube with several floats placed in it, installed between two flanges tightened by 70 pins, as well as two float limiters (a.s. Mo108982 of the USSR, IPC СО1Е 7/00, application 04/23/1956 ). Due to the presence of several floats of different mass and geometric dimensions, the specified rotameter provides measurement of the volumetric flow rate of a liquid or gas flow in a wide range. The disadvantage of this rotameter is its low reliability, which is caused by possible blows of the floats, most often on the end sections of the glass conical tube during an instantaneous change in the flow rate and the float reaching one of the limiters of its course, 12 as a result of which the corresponding end section of the glass conical tube is destroyed and the rotameter exits out of order

The closest in terms of technical essence to the proposed technical solution is a rotameter containing a glass conical tube with at least one float placed in it, installed between two flanges tightened by pins, as well as two float limiters | Industrial automation tools. Part 1. Measuring devices / In general. editor A.K. Babchenko - Kharkiv: NTU "KhPI", 2001. - P.182, fig. 4.29,61.

The specified rotameter has a simple design and ease of use, but it has the same drawback as the considered analog.

The useful model is based on the task of improving the rotameter, in which its new design eliminates the possibility of destruction of the end sections of the glass conical tube during an instantaneous change in the flow rate of the medium and when the float reaches one of the limiters of its movement, and therefore ensures high reliability of the rotameter as a whole while maintaining the simplicity of the design and ease of use.

The problem is solved by the fact that in the rotameter, which contains a glass conical tube with at least one float placed in it, installed between two flanges tightened by pins, as well as two float limiters, according to the proposed useful model, what is new is that between the glass conical 30 tube and flanges are placed safety tubular inserts. co

In the most acceptable example of a rotameter, safety tubular inserts are made of a transparent material, for example, polymethyl methacrylate. -

Equipping the rotameter with safety tubular inserts ensures that shock loads from the floats are not absorbed by the end sections of the glass conical tube, but directly by the indicated inserts. 35 Even if they are destroyed (when manufactured, for example, also from glass), they can be quickly replaced without harming the device as a whole, since the main measuring element - a glass conical tube - remains intact.

The implementation of safety tubular inserts made of transparent material also contributes to increasing the reliability of the rotameter, as it provides a simple visual control of the condition of the limiters of the float. The use of transparent polymethyl methacrylate material in Z 40 ensures their necessary strength and ease of mechanical processing during manufacture and repair. c" The essence of the useful model is explained by a drawing showing a longitudinal section of the proposed rotameter.

The rotameter contains a glass conical tube 1 with at least one float 2 placed in it, installed 45 between two tightened pins with flanges 4 and 5, as well as two float limiters 6 and 7 (Fig.). Between - the glass conical tube 1 and the flanges 4 and 5 there are safety tubular inserts 8 and 9, which can be 4! made of transparent material, for example, polymethyl methacrylate (organic glass).

The rotameter works in the following way. and A controlled flow of liquid or gas enters the lower part of the glass conical tube 1 (from the side of the flange so 20 4). As a result of the pressure drop, the float 2 rises to a height proportional to the volumetric flow rate, which exits the rotameter through the upper part of the glass conical tube 1 (from the side of the flange 5). With the presence of several serially installed floats 2, which have different mass and geometric dimensions, the upper one of the floats (not shown) begins to move first, usually when it reaches the limiter 7 (upper) of the float 2 stroke, the float next to it starts to move, etc. d. when the flow rate of the measured flow decreases, the floats are lowered in the reverse sequence. c During a momentary increase (or decrease) in the flow rate, the float 2 quickly reaches the limiter 7 (or 6) of the float stroke, can bounce back and hit the corresponding safety tubular insert 9 (or 8) with force, absorbing shock mechanical loads and preventing destruction of a fragile glass conical tube 1. 60 The proposed useful model, easy to manufacture and convenient to operate, ensures high reliability of the rotameter.

Claims (2)

The formula of the invention b5 1. A rotameter containing a glass conical tube with at least one float placed in it, installed between two pin-tightened flanges, as well as two float limiters, which is distinguished by the fact that safety tubular inserts are placed between the glass conical tube and the flanges. 2. Rotameter according to claim 1, which is characterized by the fact that the safety tubular inserts are made of transparent material. C. Rotameter according to claim 2, which differs in that the safety tubular inserts are made of polymethyl methacrylate. that 2 s (ze) in iv) є - and? - 1 -i (95) Ko) 60 b5