CN2337532Y

CN2337532Y - Glass tube wide-range flowrator

Info

Publication number: CN2337532Y
Application number: CN 98216577
Authority: CN
Inventors: 左光武; 周凌; 孔庆彦
Original assignee: RED FLAG INSTRUMENT CO Ltd KAIFENG
Current assignee: RED FLAG INSTRUMENT CO Ltd KAIFENG
Priority date: 1998-07-11
Filing date: 1998-07-11
Publication date: 1999-09-08
Anticipated expiration: 2008-07-11

Abstract

The utility model relates to a glass tube wide-range flowrator. The big end of the glass tapered tube is upwardly arranged in a cavity body constituted by two base seats, a bracket and a cover casing connected between the two base seats. The utility model is characterized in that the glass tapered tube is provided with a light float and a heavy float inside and the glass tapered tube is provided with two sets of graduation which are respectively used for displaying the flow displayed by the light float and the heavy float. The utility model can take the measurements of the media flow via the light float and the heavy float, with the advantages of simple structure, convenient repair and use, low cost, and can only use one flow meter to realize the wide-range measurement of the media flow.

Description

Glass tube wide-range spinner-type flowmeter

The utility model relates to a kind of flow instrument, particularly a kind of glass tube wide-range spinner-type flowmeter that is used to measure single-phase medium instantaneous deliveries such as non-turbid liquid or gas.

Existing its measure portion of glass tube spinner-type flowmeter is made of the float (also claiming rotor) in a vertically arranged glass tapered tube and the pipe, and its big end of this tapered tube upwards is arranged in the cavity that is made of support plate that connects between two pedestals and two pedestals and case.Under the duty, when medium passes through tapered tube from bottom to top, float can move along axis direction is upper and lower with the large and small variation of flow, when the raising force that acts on float during greater than the float weight that is immersed in the medium, circulation area between float maximum gauge and the glass tapered tube inwall increases with the rising of float, the flow velocity of medium also descends thereupon, the raising force that acts on float also reduces gradually, when raising force equals float and is immersed in weight in the medium, float just is stabilized on a certain height, at this moment, just can directly read flow value from glass tapered tube scale.Because the flowmeter survey rangeability of this structure only is 5-10, when the user runs into measurement above this rangeability, adopt the flowmeter more than two to be installed in parallel often in actual applications, select one by its measured flow.Or many flowmeters are installed in series, and during low discharge, read small flowmeter, read large capacity meter during big flow.But no matter adopt which kind of installation method, take into account accessories such as valve with purchasing many flows per family, this has not only increased fund input, and also more complicated is installed, during use, according to the big or small frequent operated valve of flow close or the turn-on flow rate meter also comparatively the trouble.

The purpose of this utility model is to provide a kind of glass tube wide-range spinner-type flowmeter, and it is not only simple in structure, use is easy to maintenance, cheap, and only can realize the measurement of degree on a large scale of flow with a flowmeter.

Its concrete solution is: in the glass tapered tube, be provided with light, weigh two floats, and frivolous son is positioned at heavy buoy upper.Flow equation according to spinner-type flowmeter

q_{V} = αA \sqrt{\frac{2 g V_{f} (ρ_{f} - ρ)}{A_{f} ρ}}

Can draw at A _F1=A _F2Situation under,

q_{v 1} = q_{v 2} \frac{α_{1}}{α_{2}} \sqrt{\frac{V_{f 1}}{V_{f 2}}} \sqrt{\frac{ρ_{f 1} - ρ}{ρ_{f 2} - ρ}}

(in the formula: footnote 1,2 is represented frivolous son and heavy float respectively; q _vBe volumetric flow rate; α is a coefficient of flow; A is a circulation area; V _fVolume for float; ρ _fDensity for float; ρ is a density of medium; A _fFor the float fluoran stream surface amasss.As long as) satisfy α ₁＜α ₂, V _F1＜V _F2, (ρ _F1-ρ)＜＜(ρ _F2-ρ) just can design desirable light, heavy float.In addition then, on tapered glass tube, be respectively equipped with two groups of flow scales, flow hour, frivolous son will at first float, and can read its flow value by the position of frivolous son low discharge scale of living in.When flow is big, frivolous son will rise to the top of tapered glass tube, and heavy float begins come-up, and can read the big flow value of this moment this moment by the position of heavy float big flow scale of living in.

The utility model can by be provided with in the flowmeter light, weigh two floats the rate-of flow in the tapered tube measured, it not only has simple in structure, easy to maintenance, directly reading, cheap advantage, and because flow measurement range degree big (maximum can reach 100-200), so only can realize the measurement of degree on a large scale of rate-of flow with this flowmeter, it has been exempted needs in the prior art to adopt many flowmeter series and parallels to use the trouble of being brought, and greatly reduces fund input.

In conjunction with the accompanying drawings the utility model is described in detail below by embodiment:

In the accompanying drawing, two pedestals (11) are for having the pedestal of flange, the two ends of two support plates (5) are passed through bolt (8) support and connection respectively in two pedestal both sides, constitute the flowmeter shell framework, organic glass case (1) is installed on the framework, is set with lining (10) in the pedestal at framework two ends (11) and plays antisepsis.Its big end of glass tapered tube (2) places between two pedestals up, do not gone out flowmeter for stopping float by medium, be equipped with backstop (12) at glass tapered tube (2) two ends, and, the gland (6) at glass tapered tube two ends is connected on the pedestal (11) by bolt (8), and be filled with airtight and watertight padding (7) in the gland (6), be provided with gasket seal (13) between lining (10) in the gland (6) and the glass tapered tube, in glass tapered tube (2), be provided with a heavy float (4) and be positioned at the frivolous son (3) that weighs float (4) top, heavy float (4) make for stainless steel material with the long-pending hammer float that equates of frivolous sub-fluoran stream surface, coefficient of flow that frivolous son (3) is made for plastic material and volume are all less than the heavy disc type float of float.Be respectively equipped with the two groups of scales (15), (14) that are used to show flow shown in light, the heavy float on the glass tapered tube (2).

During use, can be connected with vertical pipe in the pipeline by the flange on the two ends pedestal (11), when flowmeter is started working, at first be that frivolous son rises, the indication flow, when frivolous son is raised to the upper limit place of flow scale (15), simultaneously, heavy float just is raised to the lower limit place of flow scale (14), and flow continues to increase, frivolous son is raised to backstop place, flowmeter top, by heavy float indication flow value.

Claims

1, a kind of glass tube wide-range spinner-type flowmeter, its big end of glass tapered tube (2) upwards is arranged in the cavity that is made of support plate (5) that connects between two pedestals (11) and two pedestals (11) and case (1), it is characterized in that in the glass tapered tube, being provided with frivolous son (3) and heavy float (4), and, frivolous son (3) is positioned at the top of heavy float (4), and glass tapered tube (2) is provided with two groups of scales (15), (14) that are respectively applied for flow shown in light, the heavy float of demonstration.