CN2670916Y

CN2670916Y - Internal flowmeter

Info

Publication number: CN2670916Y
Application number: CN 200320131861
Authority: CN
Inventors: 刘慎民; 吕宁军; 何海燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-18
Filing date: 2003-12-18
Publication date: 2005-01-12
Anticipated expiration: 2013-12-18

Abstract

The utility model relates to a flow measuring meter with a differential pressure type. The measuring meter comprises a flange (1), a straight pipe (2) and a cone. The cone (4) which positions in the straight pipe (2) presents a V-shaped inner cone. The cone (4) is communicated with a pressure taking pipe of negative pressure (5) which extends out the straight pipe. A pressure taking pipe of positive pressure (6) positions afore the pressure taking pipe of negative pressure (5). The cone (4) is fixedly connected on a supporting rod (3) by the pressure taking port of the cone. The utility model has high precision, good repeatability, low pressure loss and wide measuring range ratio. Furthermore, with the anti-abrasion, the internal flowmeter is provided with the functions of self-rectification and self-cleaning. The internal flowmeter is used for the flow measurement of the smudge fluid, with the wide application.

Description

Inner cone flow meter

Technical field

The utility model belongs to the measurement instrument field, particularly a kind of differential pressure type flow measurement instrument.

Background technology

The differential pressure type flow measurement instrument that is used for measuring fluid at present mainly is that these restricting elements have standard orifice plate, nozzle, Venturi tube and annular orifice etc. at the pipeline that the is full of fluid restricting element of packing into.In measuring flow liquid process, these restricting elements are because the defective on the self structure makes surveying work have many unfavorable factors.As standard orifice plate, when flowing through the circular port of being opened, fluid forms the fluid local contraction, under orifice plate, can form the sizable vortex of amplitude again, make range ratio dwindle, reduced the measuring accuracy of flowmeter; The defective of annular orifice is that range ratio is little, and the differential pressure signal noise is big, poor repeatability, as run into dirty fluid, pressure port has blocked danger.The defective of Venturi tube is the erected cost height, measures when containing the particle of solid, easily piles up at neck, causes measuring error, and when being used for heavy-caliber pipeline, Venturi tube is bulky, heavy, costs an arm and a leg.

Summary of the invention

The purpose of this utility model is the weak point that exists at existing differential pressure type flow meter, and wall inner cone flow meter of contraction type gradually in a kind of limit is provided.

The technical solution of the utility model is such.By the mode of throttling element throttling, adopt the limit wall inner cone flow meter of contraction type gradually according to fluid with self-cleaning, self-rectifying effect.This flowmeter comprises flange, straight tube and cone, taper in cone is V-shaped, and cone is connected with the negative pressure pressure pipe that stretches out straight tube, and malleation pressure pipe is positioned at before the negative pressure pressure pipe, and cone is fixedly connected on the support bar by pressure tappings.The main effect of V-type inner cone is: (1) changes flow direction, realizes the effect that fluid shrinks to tube wall gradually.(2) convection cell carries out rectified action, and when fluid process cone, fluid only can produce high frequency turbulent flow by a narrow margin in the throttling element downstream, makes differential pressure transmitter obtain wideer range and better repeated.

The utility model is compared with existing differential pressure type fluid measurement instrument has following remarkable result: 1,, and precision height, good reproducibility; 2, crushing is little, and range ratio is wide; 3, wear-resistant, the measuring accuracy good stability; 4, installation requirement is lower; 5, signal stabilization does not need flow conditioner, has the self-rectifying effect; 7, have the self-cleaning function, can be used for the flow measurement of dirty fluid, be widely used.

Brief Description Of Drawings

Fig. 1 is a structural representation of the present utility model.As shown in Figure 1, main parts size of the present utility model is: 1-flange 2-straight tube 3-support bar 4-cone 5-negative pressure pressure pipe 6-malleation pressure pipe

Embodiment

Embodiment of the present utility model is illustrated in conjunction with the accompanying drawings.As shown in Figure 1, the utility model comprises flange (1), straight tube (2) and cone (4), be arranged in the V-shaped taper of cone (4) of straight tube (2), cone (4) is connected with the negative pressure pressure pipe (5) that stretches out straight tube, malleation pressure pipe (6) is positioned at negative pressure pressure pipe (5) before, and cone (4) is fixedly connected on the support bar (3) by its pressure tappings.

Measuring straight tube is that Precision Machining is good, when measuring fluid, produces differential pressure at the two ends of sharp cone.Malleation obtains at the pressure tappings place before upstream fluid is shunk, and negative pressure is to open the pressure port center at cone towards the downstream end face center to obtain.The tip of this cone is a sharp-pointed acute angle between this cone and its tail surface towards incoming flow, and the edge of this face of joining makes fluid that a level and smooth zone of transition be arranged before entering the low-pressure area in downstream.When fluid passes through the V-type inner cone, can change direction of flow, realize the effect that fluid shrinks to tube wall gradually.

Claims

1, inner cone flow meter, comprise flange (1), straight tube (2) and cone (4), it is characterized in that being arranged in the V-shaped taper of cone (4) of straight tube (2), cone (4) is connected with the negative pressure pressure pipe (5) that stretches out straight tube, malleation pressure pipe (6) is positioned at before the negative pressure pressure pipe, and cone (4) is fixedly connected on the cramp bar (3) by its pressure tappings.