CN2594770Y

CN2594770Y - Throttling differential pressure flowmeter

Info

Publication number: CN2594770Y
Application number: CN 02287271
Authority: CN
Inventors: 卢玖庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-13
Filing date: 2002-11-13
Publication date: 2003-12-24
Anticipated expiration: 2012-11-13

Abstract

The utility model relates to a throttling type differential pressure flowmeter which belongs to the technical field of flow quantity measurement. The throttling type differential pressure flowmeter comprises two pressure taking devices and a differential pressure transmitter, wherein, the two pressure taking devices are arranged at one side of a pipeline, adopting the differential pressure transmitter as the central symmetry, and a throttling element is arranged at the relative position of the inner wall of the pipeline and the differential pressure transmitter. The bottom parts of pressure taking pipes are communicated with the pipeline, two valves are arranged at the middle part of the pressure taking pipes, and the opposite direction side of the upper parts of the two pressure taking pipes are respectively communicated with one end of a pressure conducting pipe. The other end of the pressure conducting pipe is communicated with the differential pressure transmitter, and the two pressure conducting pipes and the differential pressure transmitter are connected into a flat U-shaped pipe. Filling liquid is filled in the pressure conducting pipe, and the upper part of the pressure taking pipe is full of air. A screw cap is screwed on the top part of the pressure taking pipe, and the zero stability is good. The differential pressure transmitter can be checked in real time without being affected by environment and medium temperature change.

Description

A kind of throttle differential flowmeter

Technical field: the utility model is a kind of throttle differential flowmeter, belongs to the field of measuring technique of flow, promptly a kind of flowmeter by gaging pressure or differential pressure.

Background technology: existing restriction flowmeter is made up of throttling body and flanged bellows kapillary teletransmission differential pressure transmitter usually, be applicable to high viscosity, contain the fluid of solid particle, measurement as flows such as heavy oil, residual oil, sewage, ore pulps, and be applicable to the measurement of low flow rates of fluid, be widely used in industries such as oil, chemical industry, metallurgy, electric power, but its cost height, be subject to the variation of ambient temperature influence and cause differential pressure transmitter zero point drift, and can't adjust zero point in use, the differential pressure transmitter of verification in real time.

Summary of the invention: the utility model is a kind of throttle differential flowmeter, it is the throttle differential flowmeter that links into an integrated entity by pressure obtaning device and differential pressure transmitter, it comprises pressure obtaning device 1, pressure obtaning device 1 ' and differential pressure transmitter 2, pressure obtaning device 1 and pressure obtaning device 1 ' with differential pressure transmitter 2 are the side of center symmetric offset spread at pipeline 8, inwall and differential pressure transmitter 2 relative positions at pipeline 8 are provided with throttling element 3, it is Venturi tube, venturi nozzle, nozzle, one of orifice plate or wedge type orifice plate, pressure obtaning device 1 comprises pressure pipe 4, valve 5 and connecting pipe 7, pressure obtaning device 1 ' comprise pressure pipe 4 ', valve 5 ' and connecting pipe 7 ', pressure pipe 4 and pressure pipe 4 ' bottom and pipeline 8 connect, be respectively equipped with at pressure pipe 4 and pressure pipe 4 ' middle part valve 5 and valve 5 ', pressure pipe 4 and pressure pipe 4 ' top in opposite directions a side respectively with connecting pipe 7 and connecting pipe 7 ' an end be connected, connecting pipe 7 and connecting pipe 7 ' other end are connected with differential pressure transmitter 2, pressure pipe 4 and pressure pipe 4 ' with connecting pipe 7 and connecting pipe 7 ' interface be in same surface level, connecting pipe 7 and connecting pipe 7 ' be in same surface level with the interface of differential pressure transmitter 2, and be lower than pressure pipe 4 and pressure pipe 4 ' with connecting pipe 7 and connecting pipe 7 ' interface, a flat U-shaped pipe of connecting pipe 7 and differential pressure transmitter 2 and connecting pipe 7 ' be linked to be, at connecting pipe 7 and connecting pipe 7 ' interior filling filling liquid is arranged, liquid level and connecting pipe 7 and connecting pipe 7 ' fair with the interface of differential pressure transmitter 2, pressure pipe 4 and pressure pipe 4 ' top are full of air, like this dirts that flow of pipeline 8 can not enter or block pressure pipe 4 and pressure pipe 4 ', pressure pipe 4 and pressure pipe 4 ' the top have screw, be connected with respectively on it screw cap 6 and screw cap 6 ', can turn on screw cap 6 and screw cap 6 ' adjustment zero point, also the differential pressure transmitter of verification in real time 2, zero stability is good, be not subjected to environment temperature, the influence that medium temperature changes, owing to save teletransmission kapillary flange differential pressure transmitter, not only reduced cost significantly, and safeguarded simple, easily.

Description of drawings: Fig. 1 is the utility model structural representation; Fig. 2 is the pressure obtaning device structural representation.

Embodiment: pipeline and two pressure obtaning devices are integrally welded, and be the side of center symmetric offset spread at pipeline with the differential pressure transmitter, inwall and differential pressure transmitter relative position at pipeline are equipped with throttling element, it is Venturi tube, venturi nozzle, nozzle, one of orifice plate or wedge type orifice plate, its length is half of internal diameter of the pipeline, two connecting pipes and differential pressure transmitter are linked to be a flat U-shaped pipe, in connecting pipe, pour into filling liquid, the interface of liquid level and connecting pipe and differential pressure transmitter maintains an equal level, at pressure pipe middle part valve is installed, be connected with an end of two connecting pipes respectively two relative sides in pressure pipe top, the interface of pressure pipe and connecting pipe is in same surface level, the interface of connecting pipe and differential pressure transmitter also is in same surface level, and be lower than the interface of pressure pipe and connecting pipe, have screw at pressure pipe top, and be connected with a screw cap, two pressure pipe tops are full of air, can stop the interior liquid of pipeline upwards to flow, enter or stop up the pressure pipe, and the error that causes is very little, can satisfy the accuracy requirement of flow measurement fully.

Claims

1, a kind of throttle differential flowmeter, comprise pressure obtaning device (1), pressure obtaning device (1 ') and differential pressure transmitter (2), it is characterized in that pressure obtaning device (1) and pressure obtaning device (1 ') are the side of center symmetric offset spread at pipeline (8) with differential pressure transmitter (2), on the inwall of pipeline (8), be provided with throttling element (3) with differential pressure transmitter (2) relative position.

2, a kind of throttle differential flowmeter according to claim 1, it is characterized in that pressure obtaning device (1) comprises pressure pipe (4), valve (5) and connecting pipe (7), pressure obtaning device (1 ') comprises pressure pipe (4 '), valve (5 ') and connecting pipe (7 '), the bottom of pressure pipe (4) and pressure pipe (4 ') and pipeline (8) connect, be respectively equipped with valve (5) and valve (5 ') at pressure pipe (4) and pressure pipe (4 ') middle part, a side is connected with an end of connecting pipe (7) and connecting pipe (7 ') respectively in opposite directions on the top of pressure pipe (4) and pressure pipe (4 '), and the connecting pipe (7) and connecting pipe (7 ') other end are connected with differential pressure transmitter (2).

3, a kind of throttle differential flowmeter according to claim 1 is characterized in that throttling element (3) can be any one in Venturi tube, venturi nozzle, nozzle, orifice plate or the wedge type orifice plate, and its length is half of pipeline (8) internal diameter.

4, a kind of throttle differential flowmeter according to claim 2, it is characterized in that the interface of pressure pipe (4) and connecting pipe (7) and the interface of pressure pipe (4 ') and connecting pipe (7 ') are in same surface level, connecting pipe (7) and connecting pipe (7 ') are in same surface level with the interface of differential pressure transmitter (2), and are lower than the interface of pressure pipe (4) and pressure pipe (4 ') and connecting pipe (7) and connecting pipe (7 ').

5, a kind of throttle differential flowmeter according to claim 2, it is characterized in that pressure pipe (4) and pressure pipe (4 ') top are full of air, top at pressure pipe (4) and pressure pipe (4 ') has screw, is connected with screw cap (6) and screw cap (6 ') on it respectively.

6, according to claim 2 or 4 described a kind of throttle differential flowmeters, it is characterized in that connecting pipe (7) and differential pressure transmitter (2) and connecting pipe (7 ') are linked to be a flat U-shaped pipe, irritating in connecting pipe (7) and connecting pipe (7 ') has filling liquid, and liquid level and connecting pipe (7) and connecting pipe (7 ') maintain an equal level with the interface of differential pressure transmitter (2).