CN2854543Y

CN2854543Y - Exiting structure of vibration string sensor

Info

Publication number: CN2854543Y
Application number: CN 200520073852
Authority: CN
Inventors: 王风
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-25
Filing date: 2005-07-25
Publication date: 2007-01-03
Anticipated expiration: 2015-07-25

Abstract

The utility model relates to an excitation structure with a vibrating wire sensor, belonging to the measurement instrument field, which is composed of a vibrating wire, a vibrating wire protection tube, a magnetic core, a magnetic core fixation rack, a collet and a base. The vibrating wire is sealed and be arranged in the middle of the vibrating wire protection tube. The two ends of the vibrating wire are respectively positioned at the two bases by the two collets, while the two ends of the vibrating wire protection tube are respectively provided with the two bases and the middle of the protection tube is provided with small slots so that the magnetic core is arranged in the small slots by the magnetic core fixation rack. The distance between the magnetic core and the vibrating wire depends on the depth of the small slot. The deeper the small slot is, the shorter the distance is. The centering of the vibrating wire and the depth of the small slot can be controlled by the accurate machine finishing so that the distance between the magnetic core and the vibrating wire can be accurately controlled, which should be controlled above 0.1 mm in order to prevent the magnetic core from absorbing the vibrating wire. The beneficial effect of the utility model is to evidently reduce the distance between the magnetic core and the vibrating wire, to increase the magnetic force, to reduce the dimension of the magnetic core and then to reduce the general dimension of the vibrating wire sensor.

Description

A kind of excitation structure of vibrating string type sensor

Affiliated technical field

The utility model relates to a kind of excitation structure of vibrating string type sensor, belongs to the surveying instrument field.

Background technology

The excitation structure of vibrating string type sensor mainly comprises magnetic core and string wire, and the instantaneous energising of magnetic core produces instantaneous magnetic force to string wire, and string wire is vibrated, and suitable magnetic force size is the key that guarantees the string wire stable oscillation.The effect of magnetic core just provides magnetic force, and the principal element that influences the magnetic force size is the distance between magnetic core and the string wire and the number of turn of coil.Reduce distance and can improve magnetic force, increase the number of turn and also can improve magnetic force.

In the excitation structure of existing vibrating string type sensor, there are two kinds of methods to control distance between magnetic core and the string wire.The first is fixed to magnetic core on the screw, controls this distance by artificial visually examine's adjusting screw, and the precision of adjusting depends on producer's experience, generally is difficult to this distance is controlled to below the 0.5mm; It two is methods of CN2141081Y, and it is to utilize the diameter of string wire pillar to control distance between string wire and the magnetic core.Because string wire is centered in the string wire pillar, and can not contact with string wire pillar wall, make the diameter of string wire pillar be difficult to accomplish very little, the distance of string wire and magnetic core also just can't further reduce.The diameter of the string wire pillar of CN2141081Y is 1.6-2.4mm, and the distance of string wire and magnetic core is 0.8-1.2mm.Therefore present excitation structure still can not be reduced to the distance between magnetic core and the string wire below the 0.5mm, to obtain bigger magnetic force or to reduce the number of turn of magnetic core coil, the magnetic core size also just can not further be dwindled, the magnetic core size is generally about φ 12mm * 8mm at present, its shortcoming is that volume is bigger, make the overall dimensions of sensor also become greatly, improved the cost of manufacture of sensor, also influenced the application of sensor.

Summary of the invention

In order to overcome the above-mentioned deficiency of present vibrating string type sensor excitation structure, the utility model provides a kind of excitation structure, and this excitation structure can be controlled the distance between magnetic core and the string wire exactly, and this arrives 0.1mm apart from minimum controllable system; The core volume of this excitation structure also can significantly reduce, and its size can be φ 8mm * 6mm.

The technical scheme that its technical matters that solves the utility model adopts is: string wire is centered in the string wire pillar, and is separately fixed at by chuck on the bearing at two ends, the string wire pillar also fixes with the bearing at two ends.Middle part at the string wire pillar has sulculus, and magnetic core is fixed in the sulculus by the magnetic core fixed mount.Then the distance between magnetic core and the string wire just depends on the degree of depth of sulculus, and dark more this distance of sulculus is more little.Because the degree of depth of the placed in the middle and sulculus of string wire can accurately be controlled by machine finishing, so the distance between magnetic core and the string wire also just can accurately be controlled, but adsorb string wire for fear of magnetic core, generally should be controlled at more than the 0.1mm.

The sulculus 31 that open at string wire pillar 3 middle parts as shown in Figure 1.

The beneficial effects of the utility model are, can reduce the distance between magnetic core and the string wire significantly, increase magnetic force, reduce the magnetic core size, thereby have reduced the overall dimension of vibrating string type sensor.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the synoptic diagram of string wire pillar middle part sulculus.

Among Fig. 1,3. string wire pillar, 31. sulculuses.

Fig. 2 is the utility model one-piece construction synoptic diagram.

Among Fig. 2,1. bearing, 2. chuck, 3. string wire pillar, 4. magnetic core fixed mount, 5. magnetic core, 6. string wire.

Embodiment

As shown in Figure 2, the utility model is by string wire 6, string wire pillar 3, magnetic core 5, magnetic core fixed mount 4, compositions such as chuck 2 and bearing 1, string wire 6 is sealed and be centered in the string wire pillar 3, string wire 6 two ends are fixed on two bearings 1 by two chucks 2 respectively, string wire pillar 3 two ends are fixed together with two bearings 1 respectively, string wire pillar 3 passes the transverse holes 42 of magnetic core fixed mount 4 bottoms and fixes with magnetic core fixed mount 4, magnetic core 5 be placed into magnetic core fixed mount 4 vertically in hole 41, and be pressed in the sulculus 31 at string wire pillar 3 middle parts, adopt structure glue with magnetic core then, magnetic core fixed mount and string wire pillar three fix.The diameter of string wire 6 is 0.2mm, and string wire pillar 3 is the brass tube of φ 4mm wall thickness 0.5mm, and the degree of depth of sulculus 31 is 1.7mm, and then the distance between magnetic core and the string wire is 0.2mm, and it is original 1/2 that the number of turn of magnetic core coil can be kept to, and magnetic core is of a size of φ 8mm * 6mm.

Claims

1. the excitation structure of a vibrating string type sensor, form by string wire (6), string wire pillar (3), magnetic core (5), magnetic core fixed mount (4), chuck (2) and bearing (1) etc., string wire (6) is sealed in the string wire pillar (3), string wire (6) two ends are fixed on two bearings (1) by two chucks (2) respectively, string wire pillar (3) two ends are fixed together with two bearings (1) respectively, the middle part that it is characterized in that string wire pillar (3) has sulculus (31), and magnetic core (5) can be fixed in the sulculus (31).