CN2362108Y

CN2362108Y - Resistance level sensor

Info

Publication number: CN2362108Y
Application number: CN 99203851
Authority: CN
Inventors: 曲云峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-03-24
Filing date: 1999-03-24
Publication date: 2000-02-02
Anticipated expiration: 2009-03-24

Abstract

The utility model relates to a resistance type liquid level sensor, which belongs to a measuring type instrument sensor. The utility model is characterized in that two spiral reed type resistance wires are arranged in a non-magnetic cylindrical pipe, wherein, insulating layers are coated outside the resistance wire reeds; small magnetic conducting rolling balls are arranged in the resistance wire reeds; the non-magnetic cylindrical pipe is sheathed with a floating ball, and a ring type magnetic iron is arranged in the floating ball. During the measurement, the magnetic floating ball moves up and down with the liquid level change, the small rolling balls on the inner wall of the resistance wires also synchronously roll up and down with the liquid level change under the action of the magnetic force in the floating ball, and therefore, the liquid level change can be measured by measuring the resistance change between the two resistance wires.

Description

Resistance-type level transducer

The utility model resistance-type level transducer belongs to level gauging class instrument.

The level gauging mode is various, not following tens kinds of instrument kind, as: glass type, float-type, condenser type, ultrasonic type, radar type and optical fiber type etc. are varied.Only in the magnetic float type level gauge, just there are resistance dry-reed, magnetic turnover plate type, magnetic to turn over pillar, magnetic to flex effect formula, magnetic inductive, magnetic switch formula etc., these instrument cut both ways, advantage and practical scope that oneself is respectively arranged, various defectives are also arranged, the cost height that measurement range is wide, and precision is low; Measuring accuracy is high, as: ultrasonic type, radar type and magnetic to every prices such as flex effect formula all reach units up to ten thousand, and measurement range is restricted.

The purpose of this utility model provides a kind of measuring accuracy height, measurement range is wide, cost is low liquid level sensor.

The purpose of this utility model is achieved in that two Luo are housed revolves the resistance wire of spring formula in non-magnetic column type pipe, the outside of resistance wire spring is surrounded by insulation course, the little ball of magnetic conduction is arranged in the resistance wire spring, and non-magnetic cylindrical tube is with ball float outward, and ring magnet is housed in the ball float.The utility model has been used the principle of swept resistance, shown in figure one.When the magnetic ball float moves up and down with liquid level change, under the effect of the little ball magnetic force in the magnetic ball float on the resistance wire inwall also with the synchronous scroll-up/down of liquid level change, and, no matter how ball rolls can be communicated with two adjacent resistance wires, can record liquid level change by measuring two resistance variations between resistance wire ab like this.Simultaneously, because the electrical impedance interference performance is strong, and measuring error is only relevant with the slit of two resistance wire springs, and the slit of two resistance wire springs can be done very for a short time, so the measuring accuracy of this sensor is very high.

Owing to adopt such scheme, can measure high temperature, high pressure, liquid such as perishable, and the measuring accuracy height, cost is low.

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

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is first embodiment longitudinal profile structural map of sensor

Fig. 3 is first embodiment synoptic diagram of resistance wire structure.

Fig. 4 is a magnetic ball float synoptic diagram.

Fig. 5 is second embodiment synoptic diagram of resistance wire structure.

Fig. 6 is the sensor movement synoptic diagram.

Among the figure: 1. resistance wire 2. non-magnetic cylindrical tube 3. resistance wire spring outer wall insulation courses 4. ring magnets 5. balls 6. ball floats 7. insulative cylinders pipes

Among the embodiment shown in Figure 2, the resistance wire (1) that two Luo revolve the spring formula is housed in the non-magnetic column type pipe (2), the outside of resistance wire spring (1) is surrounded by insulation course (3), the little ball (5) that magnetic conduction is arranged in the resistance wire spring (1), non-magnetic cylindrical tube (2) is outer to be with ball float (6), and ring magnet (4) is housed in the ball float (6).Two resistance wires that the resistance wire spring is adjacent are answered mutually insulated, and spin and resistance wire appearance should be non-corrosion metals, and resistance wire should be non-magnetic conduction substance, and ball should be magnetic conductive substance, and outside surface should be smooth.Spin is rolling friction in the motion of resistance wire spring inwall, and acting force is minimum, so ring magnet can be done very for a short time.

In first embodiment synoptic diagram of resistance wire structure shown in Figure 3, the outside of two resistance wire springs (1) is surrounded by insulation course (3), and the little ball (5) of magnetic conduction is arranged in the resistance wire spring (1).

Shown in Figure 5 is another embodiment of resistance wire structure, and resistance wire (1) is fixed on the vertical masonry joint both sides of insulative cylinders pipe (7), as the slideway of ball (5).The diameter of ball (5) should be greater than the distance between two resistance wires.

In concrete enforcement, the processing of resistance wire spring is a difficult point, can be earlier with two resistance wires on heat-shrink tube, simultaneously, for guaranteeing that distance is evenly inserted other two lines and together twined between two resistance wires between resistance wire, again other two lines are removed after winding, wrap insulation course in the outside of resistance wire spring then, insert conduit again, heating gets final product heat-shrink tube contraction extraction to heat-shrink tube.Another kind method is to open a vertical masonry joint shown in Figure 5 with the carbon fiber cylindrical tube, then two resistance wires is wrapped on the surface of carbon fiber pipe, wraps insulation course, together inserts conduit.

Claims

1, a kind of liquid level sensor, outside non-magnetic cylindrical tube, be with ball float, ring magnet is housed in the ball float, it is characterized in that: two Luo are housed in the non-magnetic column type pipe revolve the resistance wire of spring formula, the outside of resistance wire spring is surrounded by insulation course, and the little ball of magnetic conduction is arranged in the resistance wire spring.

2, resistance wire according to claim 1 is characterized in that: two resistance wires are separately fixed at the both sides of insulative cylinders pipe vertical masonry joint, and ball rolls between two resistance wires.