CN201795818U

CN201795818U - Plug-in type electromagnetic flow meter sensor

Info

Publication number: CN201795818U
Application number: CN2010205359395U
Authority: CN
Inventors: 黄平; 黄训松
Original assignee: FUJIAN SHANGRUN PRECISION INSTRUMENT Co Ltd
Current assignee: FUJIAN SHANGRUN PRECISION INSTRUMENT Co Ltd
Priority date: 2010-09-27
Filing date: 2010-09-27
Publication date: 2011-04-13
Anticipated expiration: 2020-09-27

Abstract

The utility model discloses a plug-in type electromagnetic flow meter sensor. The sensor comprises a shell, two iron cores, a pair of electrodes, an electrode fixing seat and a coil, wherein a through hole through which conductive liquid flows is formed on the shell; the two iron cores are arranged in the shell in parallel; the lower parts of the two parallel iron cores are connected by another iron core; the coil is wound on the connected iron cores; a through hole is formed in the center of the electrode fixing seat and corresponds to the through hole of the shell; the electrode fixing seat is arranged between the two iron cores; and the pair of electrodes is fixed at the upper end and the lower end of a U-shaped cavity formed by the two parallel iron cores behind the electrode fixing seat along the vertical direction. By using the structure of the utility model, the linearity of sensor measurement can be improved, the distance between the two electrodes is ensured to be the maximum while the sensor has the same size, the electrodes are arranged along the axial direction of the sensor, and an induction signal is increased and stabilized.

Description

Inserted electromagnet flow meter sensor

Technical field

The utility model relates to sensor, particularly relates to inserted electromagnet flow meter sensor.

Background technology

The measuring system of electromagnet flow meter sensor is based on Faradic electricity magnetic induction and decides rate, with measuring tube axis and the orthogonal tube wall of magnetic field magnetic line on a pair of detecting electrode is installed, when conducting liquid during along the measuring tube axial-movement, conducting liquid is made cutting magnetic line movement and is produced induced potential.This induced potential is detected by two electrodes on the measuring tube.This induced potential is provided by following formula:

U=K·B·L·V

In the following formula: U is an induced voltage, and K is a meter constant, and B is a magnetic field intensity, and L is conductor length (distance between the electrode), and V is the conductor movement velocity.Therefore, when magnetic field intensity B was constant, induced voltage U was proportional to the speed V and the L of motion.

Existing inserted electromagnet flow meter sensor is a kind of novel fluid flow instrument that grows up on the basis of duct type electromagnet flow meter sensor.It is on the basis that keeps duct type electromagnetic flowmeter advantage, at the duct type electromagnet flow meter sensor difficulty is installed on large pipeline, defectives such as expense is big, after adopting press and open holes, band to press field engineering, inserted electromagnet flow meter sensor can be installed under the situation of (water) of not stopping, also can be on cast-iron pipe, open fire canal, PE pipe, install on the concrete duct.Different with general electromagnet flow meter sensor is, emission magnetic field outside the sensor of inserted electromagnet flow meter can form in the outside of sensor, the induced signal of therefore outer emission magnetic field electromagnetic current speed sensors is influenced by the boundary layer thickness in flow field and magnetic field, can reduce the linearity of measurement; Simultaneously, potential electrode is in the end or the both sides of sensor, and there is limitation in distance between electrodes (L), and transducing signal is not very stable.

For example patent of invention 200310109710, denomination of invention is " inserted electromagnet flow meter sensor ", as shown in Figure 1, a kind of inserted electromagnet flow meter sensor is disclosed, it comprises electrode 11, coil 12 and sheath 13, it is characterized in that having two groups of coils to be located at the both sides of electrode 11 in 13 minutes, and between coil 12 and sheath 13, be provided with bell housing 14.Though be provided with bell housing 14 in this patent, closed shielding is not carried out in whole magnetic field, emission magnetic field reduces the linearity of measuring outside the sensor outside still can form.

Summary of the invention

The utility model provides a kind of and can produce airtight internal magnetic field, the inserted electromagnet flow meter sensor that induced signal is stable in order to overcome the deficiency of above-mentioned prior art.

In order to achieve the above object, the utility model inserted electromagnet flow meter sensor comprises shell, two iron cores, pair of electrodes, electrode holder and coil, described shell is provided with the through hole that conducting liquid flows through, two parallel being located in the shell of iron core, two parallel mandrel lower are connected by another root iron core, coil is wound on this connection iron core, the center of electrode holder is a through hole, its through hole is corresponding with outer casing through hole, described electrode holder is located between two iron cores, and pair of electrodes is fixed in the two ends up and down that are positioned at the U die cavity that two parallel iron cores form behind the electrode holder respectively up and down.

Be provided with one deck yoke between described iron core and shell.

In the utility model, one deck yoke is set between shell and iron core, will sends out magnetic field outward and become airtight internal magnetic field, make the magnetic field of generation very stable, with the external world do not have related, the linearity of improve measuring; Simultaneously, electrode is fixed in the two ends up and down that are positioned at the U die cavity that two parallel iron cores form behind the electrode holder, distance is big in the identical big or small condition bottom electrode of sensor installation site; And electrode is not both sides or the end face that is installed in sensor by classic method, but axial direction, thereby can strengthen induced signal, stable to reach induced signal.

Generally speaking, adopt structure of the present utility model, can improve the linearity of sensor measurement, guarantee that when sensor size is identical two interelectrode distances are maximum, electrode is installed in the axial direction of sensor, increase and the sense of stability induction signal.

Description of drawings

Now in conjunction with the accompanying drawings the utility model is further elaborated:

Fig. 1 is the prior art structural drawing;

Fig. 2 is the cut-open view of the utility model inserted electromagnet flow meter sensor;

Fig. 3 is the structural representation of the shell of the utility model inserted electromagnet flow meter sensor.

Embodiment

As Fig. 2 or shown in Figure 3, the utility model inserted electromagnet flow meter sensor comprises shell 1, two iron cores 2, pair of electrodes 3, electrode holder 4 and coil 5, described shell 1 is provided with the through hole 12 that conducting liquid flows through, two iron core 2 parallel being located in the shell 1, the bottom of two parallel iron cores 2 is connected by another iron core 21, coil 5 is wrapped on this connection iron core 21, the center of electrode holder 4 is a through hole 41, its through hole 41 is corresponding with the through hole 12 of shell 1, described electrode holder 4 is located between two iron cores 2, and pair of electrodes 3 is fixed in the two ends up and down that are positioned at the U die cavity that two parallel iron cores 2 form behind the electrode holder 4 respectively up and down.

1 on iron core 2 and shell are provided with one deck yoke 6.

During use, be wound in the coil 5 that connects iron core 21 and produce a magnetic field, the yoke 6 that iron core 2 and shell are 1 plays the effect of armoured magnetic field, is not subjected to extraneous interference.When the central through hole 41 of conducting liquid from electrode holder 4 flows through, cutting magnetic line produces signal induced electricity, by the electrode detection on the electrode holder 4 and spread out of.

Claims

1. inserted electromagnet flow meter sensor, comprise shell, two iron cores, pair of electrodes, electrode holder and coil, described shell is provided with the through hole that conducting liquid flows through, two parallel being located in the shell of iron core, two parallel mandrel lower are connected by another root iron core, coil is wrapped on this connection iron core, the center of electrode holder is a through hole, its through hole is corresponding with outer casing through hole, it is characterized in that: described electrode holder is located between two iron cores, and pair of electrodes is fixed in the two ends up and down that are positioned at the U die cavity that two parallel iron cores form behind the electrode holder respectively up and down.

2. inserted electromagnet flow meter sensor according to claim 1 is characterized in that: be provided with one deck yoke between iron core and shell.