CN2337530Y

CN2337530Y - Impulse flowmeter

Info

Publication number: CN2337530Y
Application number: CN 98208475
Authority: CN
Inventors: 范蓉
Original assignee: Shanghai Pulian Technology Co Ltd
Current assignee: Shanghai Pulian Technology Co Ltd
Priority date: 1998-04-09
Filing date: 1998-04-09
Publication date: 1999-09-08
Anticipated expiration: 2008-04-09

Abstract

The utility model relates to an impulse flowmeter, which comprises a flow transmitter and an indicating instrument, wherein, the flow transmitter is composed of a casing, a seat which is fixed on the casing, a protective casing which is fixed on the casing by the seat, and a flow sensor; the sensor comprises a strain body; the strain body is positioned in the protective casing, and one end of the strain body is fixed on the casing; the upper side of the strain body is pasted with a strain foil; the inner part of the strain body is provided with a lever; the upper end of the lever is fixed with the free end of the strain body, and the lower end of the lever is vertically and downwards extended into the casing; the lower end of the lever is provided with an impulse body (a target body). the utility model has the advantages of simple structure, high entirety performance, and little error.

Description

Impulse flowmeter

The utility model relates to the flow measurement meter, relates to impulse flowmeter especially.

Existing impulse flowmeter generally comprises flow transmitter and Displaying Meter two parts, the main body of flow transmitter is a disc target, and when fluid flowed, the particle that flows impacted on target, make target produce micro displacement, this displacement has just reflected the size of flow.Its principle of work is, when fluid flows, and one of effect and the proportional power of velocity head on target, momentum body (target body) is contained on the lever of flexible seal, and the power that acts on the momentum body (target body) is measured in the dynamic balance converter via lever transmission.The acting force that bears on measured flux and the momentum body (target body) and the gap of looping pit are relevant.Therefore, as long as adopt the dynamic balance converter to measure the size that momentum body (target body) is gone up suffered acting force, can draw measured flux.Yet there is following problem in present target type meter: 1. owing to adopt the dynamic balance throw-over gear of vector mechanism driving, its measuring accuracy is low, and repdocutbility is poor, and error is big back and forth, and is not shock-resistant, fragile; 2. owing to be subjected to the restriction of sensing arrangement, the flow range ability is narrow, only is 1:3; 3. owing to the mechanical transmission structure complexity, so detection sensitivity is low, energy measurement hangs down flow velocity, low discharge, and can not be used for measurement gas and steam in actual use.

Given this, the purpose of this utility model is to provide a kind of impulse flowmeter, and it is simple in structure, the overall performance height, and error is little, applied range.

For this reason, a kind of impulse flowmeter that the utility model provides, comprise flow transmitter and Displaying Meter two parts, described flow transmitter by housing, be fixed in base on the housing, be fixed in a protective sleeve and a flow sensor on the housing by base, it is characterized in that: described flow sensor comprises a response body, described response body is positioned at protective sleeve, and the one end is fixed on the described housing, is pasted with foil gauge on the response body; Be provided with a lever in the described response body, its upper end is fixed with the free end of response body, and the lever lower end is stretched in the housing vertically downward, and described lever lower end is equipped with a momentum body (target body).

Because the utility model has adopted the sensor of response body and foil gauge form, and avoided the dynamic balance throw-over gear adopted in the prior art target type meter, thereby simplified the structure of flow converter, and overcome the defective that error easily takes place mechanical drive, improve measurement sensitivity, thereby can be widely used in the measurement of various fluids.

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, with the understanding of further intensification, wherein to architectural feature of the present utility model and advantage:

Fig. 1 is the broken section front elevation of a preferred embodiment of the utility model impulse flowmeter;

Fig. 2 is the cut-open view of flow sensor in the target type meter among Fig. 1;

Fig. 3 is the sectional view along Fig. 2 center line F-F;

See also Fig. 1-shown in Figure 3, there is shown a kind of embodiment according to impulse flowmeter of the present utility model.This flowmeter mainly is made of flow transmitter A and Displaying Meter B; Flow transmitter A comprises a housing 1, constitutes the measurement chamber that flow passes through in this housing 1; One protective sleeve 2 is fixed on the housing 1 by a base 3, constitutes a sealed space like this.Also comprise a flow sensor 4, this sensor can replace the dynamic balance throw-over gear of present target type meter, thereby simplified the structure of flow converter, and has overcome the defective that error easily takes place mechanical drive, improve measurement sensitivity, thereby can be widely used in the measurement of various fluids.This sensor 4 comprises an I-shaped response body 41, and this response body 41 is positioned at protective sleeve 2, and the one end is fixed on the housing 1, as shown in Figure 1.This response body 41 is a hollow, also is equipped with a lever 42 in it, and the free end N of these lever 42 upper ends and response body fixes, and the lower end is stretched into vertically downward and measured chamber (as shown in Figure 1), and the N place promptly constitutes the fulcrum of lever 42 on response body 41 like this.On stretching into that end in the chamber, lever 42 is fixed with a momentum body (target body) 43, the impulse force when flowing to bear fluid.Be pasted with four foil gauge m, n on response body 41, foil gauge m, n are connected with Displaying Meter B by circuit.

Impulse flowmeter of the present utility model also is that the principle of utilizing momentum body (target body) be subjected to displacement by fluid impact is measured flow.As shown in Figure 1, impulse flowmeter of the present utility model is flatly installed (also can vertically install as required), and when the measurement chamber inner fluid in the housing 1 did not flow, momentum body (target body) and whole sensor were in the effect of initial static equilibrant; When fluid flowed as the direction of arrow from left to right, the momentum body (target body) 43 in the chamber was subjected to the impact of fluid, and momentum body (target body) convection cell produces a reacting force simultaneously, i.e. resistance, this power F ₁Be delivered to fulcrum N by lever 42, owing to response body 41 is fixed, so power F ₁Be delivered on the response body 41, on response body 41, produce a dynamic stress F ₂Foil gauge m, n on the response body, dynamic stress F ₂Compare with the initial static equilibrant, dynamic stress makes response body 41 produce distortion during greater than the initial static equilibrant.In the present embodiment, foil gauge m, n are the foil resistance foil gauge, the distortion of response body causes the variation of strain bridge circuit resistance bridge, handle input signal by the bridge circuit signal detector, and the standard direct current signal of output 4-20mA, and this value is delivered to Displaying Meter B by circuit, finally demonstrates the flow value of detected fluid.

Compare with other flowmeter commonly used at present, impulse flowmeter of the present utility model has following characteristics:

1. be not subjected to pipeline vibration effect, have good vibration and interference resistance, especially the low flow velocity of energy measurement, low discharge can improve the lower limit flow measurement range, on-the-spotly use verification simple (available extension hang down method);

2. pressure loss is little, and measurement range is big, and is cheap;

3. simple in structure, no movable member, range ability is big, and is shock-resistant, and the life-span is long, safeguards easy to use.

Below in conjunction with the accompanying drawings an embodiment of the present utility model is described in detail, but for those of ordinary skill in the art, design also can be made multiple variation according to the utility model, for example, the shape of response body can be T shape or ⊥ shape; Foil gauge also can be various existing foil gauges, and the stickup of the foil gauge on response body face can be a plane symmetry shape, cylindrical or polygonal.In addition, lever can be made into hollow, in it temperature sensing meter 5 can be installed, and lever both can be done the stress transmission like this, can play the medium temperature compensation again.

Claims

1. impulse flowmeter, comprise flow transmitter and Displaying Meter two parts, described flow transmitter by housing, be fixed in base on the housing, be fixed in a protective sleeve and a flow sensor on the housing by base, it is characterized in that: described flow sensor comprises a response body, described response body is positioned at protective sleeve, the one end is fixed on the described housing, is pasted with foil gauge on the response body; Be provided with a lever in the described response body, its upper end is fixed with the free end of response body, and the lever lower end is stretched in the housing vertically downward, and described lever lower end is equipped with a momentum body.

2. impulse flowmeter as claimed in claim 1 is characterized in that: described response body is I-shaped.

3. impulse flowmeter as claimed in claim 1 is characterized in that, described response body is a T shape.

4. impulse flowmeter as claimed in claim 1 is characterized in that, described response body is a ⊥ shape.

5. as claim 1 or 2 or 3 or 4 described impulse flowmeters, it is characterized in that described lever is hollow, it is built-in with a temperature sensing meter.

6. as claim 1 or 2 or 3 or 4 described impulse flowmeters, it is characterized in that described foil gauge is a resistance strain gage.