CN2241325Y

CN2241325Y - Capacity liquid level sensor

Info

Publication number: CN2241325Y
Application number: CN 95214496
Authority: CN
Inventors: 陈�光
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-06-30
Filing date: 1995-06-30
Publication date: 1996-11-27
Anticipated expiration: 2005-06-30

Abstract

The utility model relates to a capacity liquid level sensor which comprises an inner column and an outer cylinder, wherein, the outer surface of the inner column is provided with an isolating layer, and the inner column is arranged in the outer cylinder; the upper end of the inner column is fixed to the middle position of an upper flange cover by a locking nut; an upper flange is arranged on the outer cylinder and is fixedly connected with the upper flange cover by bolts and nuts; the side face of the outer cylinder 1 is provided with a B end tube which is connected with boiler water in a boiler drum and an A end tube which is connected with boiler steam in the boiler drum. The utility model solves the problem that scale effects measurement of the sensor and has the advantages of high measurement precision, stable performance, simple structure and low cost. Besides, the utility model is capable of accurately carrying out displaying, controlling and alarming extreme position.

Description

Capacitance level transducer

The utility model relates to a kind of sensor of measuring liquid level, particularly a kind of capacitance level transducer.

The boiler liquid level sensor that has used has electric pole type, photo-electric and float-ball type.Electric pole type is a characteristic of utilizing the water conduction, the metal electrode post of many differing heights is set, major defect be boiler scale (impurity in the water is the sediment that solid phase is separated out through not evaporating and concentrating on the Boiler Metallic surface) when existing electrode column resistance increase malfunctioning easily.Photo-electric is to place light source and photoelectric tube in the both sides of water gauge glass, utilizes lighting change photoelectric tube resistance to control, and major defect is malfunctioning easily when there is dirt inboard and outside when glass tube, the maintenance inconvenience.Float-ball type is that hollow float moves up and down with liquid level, connect Metallic rod in buoy upper, constitute the magnetic control dry-reed with its assembly, the sensor of mercury cut-off formula and telefault formula, because float is done mechanical motion, float can not be too big with outer ligament, and under the situation of High Temperature High Pressure and boiler scale existence, the continuous accumulation of incrustation scale easily causes the card jail.In sum, the subject matter that influences the boiler sensor use is the incrustation scale of boiler, add various places water quality difference, water treatment does not reach requirement, the boiler room management work is with not going, caused the high phenomenon of present boiler sensor crash rate, the malfunctioning umber one that has accounted for boiler breakdowns of water level alarm system has seriously influenced the safe operation of boiler.

The purpose of this utility model is to overcome the shortcoming of existing boiler sensor, solves the influence of incrustation scale to sensor, for boiler liquid level control provides simple in structure, stable performance, capacitance level transducer reliable, with low cost, easy to use.

The purpose of this utility model takes following measure to realize:

The utility model comprises inner prop, urceolus, the outside surface of described inner prop is provided with separation layer, the lower end of inner prop places in the urceolus, and the upper end of inner prop is fixed on the upper flange lid centre position by check nut, and the upper flange on the urceolus is connected with fixed by nut by bolt with the upper flange lid.

The side of described urceolus is provided with B end pipe that connects boiler drum stove water and the A end pipe that is connected boiler drum steam.

Described inner prop is metal or the crooked multiply metal material of energy, separation layer is a polytetrafluoroethylplastic plastic or other is as insulating material such as plastics, rubber, urceolus is metal seamless tube or metal hollow pipe, and check nut is processed into by polytetrafluoroethylplastic plastic or metal.

Structural design of the present utility model, the inside surface of inner prop surface and urceolus is regarded as two pole plates of a coaxial garden cylindrical condenser, constant when their distance, area is constant and during mutually insulated, capacitance also just changed thereupon when the shared length ratio of inner two media changed, and promptly water level is directly proportional with capacitance.Because its incrustation scale relative dielectric constant little (being 2-3), to the influence of capacitance type sensor various sensors far below present use.

Of the present utility modelly compare, have following advantage with existing product:

1, can overcome the various faults that incrustation scale causes;

2, do not have the machinery motion, can continuous detecting indicate liquid level;

3, the linearity is good, measuring accuracy height, stable performance, reliable;

4, simple in structure, transposing is installed conveniently, and very easily to having the repacking of boiler liquid level sensor now;

5, can in high temperature, high pressure, strong acid, highly basic liquid, detect liquid level;

6, do not change traditional metering system and can carry out demonstration, control and the advantage such as warning of extreme position exactly.

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

Fig. 1 is a structural representation of the present utility model

Embodiment with reference to the accompanying drawings, the capacitance type liquid level sensing comprises urceolus 1, inner prop 5, the outside surface of inner prop 5 is provided with separation layer 2.The lower end of inner prop 5 places in the urceolus 1, and its upper end is fixed on the centre position of upper flange lid 3 by check nut 4, is suspension status.3 on upper flange 8 on the urceolus 1 and upper flange lid is fixedlyed connected with nut 7 by bolt 6, is provided with pad between two flanges.

1 of upper flange 8 and urceolus adopt welding manner to link into an integrated entity.

Urceolus 1 is selected metal seamless tube for use, and inner prop 5 is made by metal bar, and separation layer 2 is made as insulating material such as plastics, rubber by polytetrafluoroethylplastic plastic or other, and check nut 4 is processed into by polytetrafluoroethylplastic plastic or metal.

When measurement environment is during at no pressure condition, inner prop 5 can be by making by crooked multiply metal material, and the bottom of urceolus 1 can be set as opening.

The side of urceolus 1 is provided with B end pipe and A end pipe, and B end pipe connects boiler drum stove water, and A end pipe connects boiler drum steam.The liquid level of sensor has just reflected the water level of boiler drum like this.When respectively connecing a lead on the upper end of inner prop 5 and urceolus 1, (being urceolus ground connection) just can take out the electric capacity of variation, and can control automatically and report to the police by the height of setting.

Claims

1, a kind of capacitance level transducer, comprise inner prop (5), urceolus (1), the outside surface that it is characterized in that described inner prop (5) is provided with separation layer (2), the lower end of inner prop (5) places in the urceolus (1), the upper end of inner prop (5) is fixed on upper flange lid (3) centre position by check nut (4), and the upper flange (8) on the urceolus (1) is fixedlyed connected with nut (7) by bolt (6) with upper flange lid (3).

2, condenser type liquid sensor according to claim 1 is characterized in that the side of described urceolus (1) is provided with B end pipe that connects boiler drum stove water and the A end pipe that is connected boiler drum steam.

3, capacitance level transducer according to claim 1 and 2, it is characterized in that described inner prop (5) is metal or the crooked multiply metal material of energy, separation layer (2) is a polytetrafluoroethylplastic plastic or other is as insulating material such as plastics, rubber, urceolus (1) is metal seamless tube or metal hollow pipe, and check nut (4) is processed into by polytetrafluoroethylplastic plastic or metal.