CN202329708U - Excitation coil fixing structure for electromagnetic flow-meter - Google Patents

Abstract

The utility model provides an excitation coil fixing structure of an electromagnetic flowmeter, which includes a liner, a pressure plate, a support stud fixed on the outer wall of the liner and an excitation coil located on the outer wall of the liner. The inner surface of the top presses the excitation coil on the outer wall of the liner, and the two ends of the bottom of the pressing plate are respectively fixed on the support studs by locking nuts. The cross-section of the pressing plate in the utility model is in the shape of "a few". After the lock nut is installed on the supporting stud, the height of the lock nut sinks, which saves the installation space of the excitation coil and improves the convenience of fixing the excitation coil. . At the same time, the several "shaped pressure plate also limits the shape of the exciting coil, so that the designed coil has a uniform width and a consistent shape, which ensures the balance and consistency of the magnetic field distribution and provides a guarantee for improving the performance of the sensor.

Description

The excitation coil fixing structure of the electromagnetic flowmeter

technical field

The utility model relates to an electromagnetic flowmeter, in particular to an excitation coil fixing structure of the electromagnetic flowmeter.

Background technique

The electromagnetic flowmeter uses Faraday's law of electromagnetic induction, that is, the conductive liquid flows in the non-magnetic measuring tube perpendicular to the magnetic field, and the flow in the direction perpendicular to the flow direction is proportional to the flow rate. According to the induced electromotive force, we can know the size of the flowing flow according to the magnitude of the induced electromotive force.

The sensor chamber of the electromagnetic flowmeter is equipped with a measuring tube, and excitation coils are installed on both sides of the outer wall of the liner of the measuring tube. After passing the exciting current, a magnetic field is generated to pass through the measuring tube, and then the induced potential is drawn out by the electrode, and sent to the converter to display the flow rate. Signal. Referring to Figures 6 to 8, the existing fixing structure of the excitation coil includes a liner 1, a pressure plate 2, a support stud 3 fixed on the outer wall of the liner 1, and an excitation coil 4 located on the outer wall of the liner 1, and the pressure plate 2 is a flat plate , the pressing plate 2 presses the exciting coil 4 on the outer wall of the liner, and the two ends of the pressing plate 2 pass through the support stud 3 and are fixed by the flat washer 6, the spring washer 7 and the lock nut 5. Although the existing fixing structure is firm and reliable, the height of the flat washer, spring washer and bolt head used to fix the excitation coil will affect the space of the sensor chamber, especially the small diameter, clamping type, etc. For sensors with a relatively compact space, a height of a few millimeters will make the assembly of the instrument difficult.

Utility model content

The technical problem solved by the utility model is to provide an excitation coil fixing structure of the electromagnetic flowmeter, which can save the installation space of the excitation coil.

The technical scheme of the utility model is: an excitation coil fixing structure of an electromagnetic flowmeter, including a liner, a pressure plate, a support stud fixed on the outer wall of the liner, and an excitation coil located on the outer wall of the liner, characterized in that the pressure plate The cross-section of the pressure plate is in the shape of "Ji", the inner surface of the top of the pressure plate presses the excitation coil on the outer wall of the liner, and the two ends of the bottom of the pressure plate are respectively fixed on the support studs by lock nuts.

The length of each support stud is less than or equal to the height from the top to the bottom of the platen.

A flat washer and a spring washer are arranged between the pressing plate and the lock nut.

The beneficial effects of the utility model are: the cross-section of the pressing plate in the utility model is in the shape of “几”, the inner surface of the top of the pressing plate presses the excitation coil on the outer wall of the liner, and the two ends of the bottom of the pressing plate are respectively fixed on the On the supporting stud, compared with the existing flat pressing plate, the length of the supporting stud can be shortened. After the lock nut is installed on the supporting stud, the height of the locking nut sinks, and the original position on the flat pressing plate Flat washers, spring washers, and the top of the support stud are lowered below the outer surface of the excitation coil, or the top of the support stud is flush with the outer surface of the excitation coil, so that only about 3mm to 4mm of space is left between the excitation coil and the sensor housing , is enough to meet the assembly of the excitation coil, saves the installation space of the excitation coil, and improves the convenience of fixing the excitation coil. At the same time, the several "shaped pressure plate also limits the shape of the exciting coil, so that the designed coil has a uniform width and a consistent shape, which ensures the balance and consistency of the magnetic field distribution and provides a guarantee for improving the performance of the sensor.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the A-A line schematic diagram of Fig. 1;

Fig. 3 is the enlarged schematic diagram of the M place of Fig. 2;

Fig. 4 is the structural representation of the pressing plate in the utility model;

Fig. 5 is the structural representation of the excitation coil in the utility model;

Fig. 6 is the structural representation of prior art;

Fig. 7 is the B-B line schematic diagram of Fig. 6;

FIG. 8 is an enlarged schematic diagram of N in FIG. 7 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Referring to Fig. 1 to Fig. 5, an excitation coil fixing structure of an electromagnetic flowmeter includes a liner 1, a pressure plate 2, a support stud 3 fixed on the outer wall of the liner 1, and an excitation coil 4 located on the outer wall of the liner 1, and the liner 1 Both sides of the outer wall are symmetrically equipped with excitation coils. After the excitation current is passed, the excitation coils on both sides generate a magnetic field that passes through the measuring tube, and then the induced potential is drawn out from the electrodes, and sent to the converter to display the flow signal. Each excitation coil 4 is respectively fixed by the pressure plate 2, and the cross-section of each pressure plate 2 is in the shape of “几”. The inner surface 2a of the top of the pressure plate 2 presses the excitation coil 4 on the outer wall of the liner 1, and the two ends of the bottom of the pressure plate 2 respectively pass through The locking nut 5 is fixed on the support stud 3, wherein one end of the pressing plate 2 is located in the inner ring of the exciting coil 4, the other end of the pressing plate 2 is located outside the exciting coil 4, and a Flat washer 6 and spring washer 7 to enhance the tightness of lock nut 5. The length of each supporting stud 3 is less than the height from the top to the bottom of the pressing plate 2, so that the top of the supporting stud 3 is lowered below the outer surface of the excitation coil 4, and the length of each supporting stud 3 can also be equal to the height from the top to the bottom of the pressing plate 2 , so that the top of the supporting stud 3 is flush with the outer surface of the exciting coil 4 .

Claims (3)

1. An excitation coil fixing structure of an electromagnetic flowmeter, comprising a liner, a pressure plate, a support stud fixed on the outer wall of the liner, and an excitation coil positioned at the outer wall of the liner, characterized in that: the cross section of the pressure plate is “several ” shape, the inner surface of the top of the pressure plate presses the excitation coil on the outer wall of the liner, and the two ends of the bottom of the pressure plate are respectively fixed on the support studs by lock nuts. 2. The excitation coil fixing structure of the electromagnetic flowmeter according to claim 1, wherein the length of each supporting stud is less than or equal to the height from the top to the bottom of the pressure plate. 3. The excitation coil fixing structure of the electromagnetic flowmeter according to claim 1, wherein a flat washer and a spring washer are arranged between the pressing plate and the lock nut.

Images