CN2260315Y

CN2260315Y - Corrosion-resistant liquid level sensing device for pressure container

Info

Publication number: CN2260315Y
Application number: CN 96226049
Authority: CN
Inventors: 段祥照
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-25
Filing date: 1996-04-25
Publication date: 1997-08-20
Anticipated expiration: 2006-04-25

Abstract

The utility model relates to a corrosion-resistant liquid level sensing device for a pressure container, comprising a casing, a sensing device shell and a sensitive element which are assembled in the casing, wherein, the casing is provided with a sealing press cover, a sealing flange and a connecting box. Transitional rings at the pressure measuring end and the reference pressure end of the sensing device shell are respectively used for encapsulating isolation diaphragms by using pressure diaphragm rings, and pressure guide medium is filled between the two isolation diaphragms; the inner and the outer lead wire contacts of the sensing element are shielded and encapsulated in a protective sleeve, and a sealed cavity at the reference pressure end is communicated with a medium to be measured through an upper pressure conducting pipe. The utility model which adopts an isolated closed structure solves the problem of measuring the liquid level of corrosive medium of strong acid and strong alkali kinds in a pressure container; the service performance and the service life of the sensing device can be enhanced.

Description

Corrosion-resistant band pressure vessel liquid level sensor

The utility model relates to a kind of liquid level sensor, and particularly a kind of can being applicable to measured the corrosion-resistant band pressure vessel liquid level sensor of being with the strong acid and strong base class medium in the pressure vessel.

The existing way of measuring liquid level in the band pressure vessel mainly contains two kinds: one adopts the differential pressure pick-up of band teletransmission flange, and it two is the high-precision pressure sensors that adopt more than two.Above-mentioned two kinds of ways are because of troublesome poeration, measure inaccurately, can't measure problems such as viscous medium, and influence is promoted the use of.The present inventor designs a kind of band pressure vessel liquid level sensor once at the problems referred to above, has widened measurement range and has improved measuring accuracy.But because of the sealing to sensitive element and lead contact thereof does not generally realize isolating fully, be difficult to prevent the corrosion of moisture attacks and other hazardous medium, so not only influence the stability of pressure transducer work, and when measuring strong acid, highly basic class medium, reduce its serviceable life.Up to now, also there are not the strong acid in the energy measurement band pressure vessel, the Ideal Liquid level sensor of highly basic class medium.

The purpose of this utility model provides a kind of corrosion-resistant band pressure vessel liquid level sensor, it adopts and isolates enclosed construction, fundamentally solved the problems of measurement of measuring strong acid and strong base class corrosive medium liquid level in the band pressure vessel, the usability and the serviceable life of further having improved sensor.

The purpose of this utility model is achieved in that this device comprises housing and interior sensor shell, the sensitive element of assemble case that has sealing gland, seal flange and terminal box, wherein sensor shell pressure measurement end, utilize press mold ring seal dress isolation diaphragm respectively with reference to the transition rings of pressure side, filling pilot medium between two isolation diaphragms, the inside and outside lead contact of sensitive element, barrier enclosure is communicated with measured medium by last connecting pipe with reference to the sealed cavity of pressure side in protective jacket.

Because the utility model adopts transition rings and the press mold ring is encapsulated in the pressure measurement end of sensor shell respectively with isolation diaphragm and with reference to pressure side, filling pilot medium between two isolation diaphragms, so the sensitive element and the measured medium that are encapsulated in the sensor shell are isolated fully, prevent the corrosion infringement of measured medium effectively.The inside and outside lead contact barrier enclosure of sensitive element is in protective jacket, be isolated from the outside, fundamentally solved the lead contact that exists in the prior art easily by the problem of moisture attacks and the corrosion of other hazardous medium, thus the serviceable life of further improving sensor.Exist under the bigger background pressure situation at the band pressure vessel, by the reference pressure side that communicates with measured medium, utilize differential pressure principle, accurately measure the liquid level that the interior temperature of band pressure vessel is lower than 200 ℃ of strong acid, highly basic class corrosive medium, export with electric signal, thereby improve interior strong acid, the highly basic class corrosive medium level gauging precision of band pressure vessel, help improving the usability of sensor.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a kind of concrete structure synoptic diagram of the utility model.

Describe concrete structure of the present utility model in detail according to Fig. 1.This device adopts wide-mouth balance cover type throw-in type structure.It comprises the housing 15 that is fixed with seal flange 14, terminal box 20, be encapsulated in the sealing gland 1 of housing upper end, be encapsulated in sensor shell 22 in the housing and assembly thereof,

anticorrosive packing

16,23, sealing bush 13, balance cover 12 parts such as grade.Wherein the assembly of sensor shell 22 is formed by the sealed protective cover 21 that is encapsulated in sensitive element 7 in the sensor shell 22, internal lead 17, insulator 18, outside line line 19, sensor shell 22 and pressure measurement end thereof with reference to the

transition rings

6,8 of pressure side, isolation diaphragm 5,9, press mold ring 4,10 etc.The

transition rings

6,8 at sensor shell 22 two ends is utilized respectively between the isolation diaphragm 5,9 of press mold ring 4,10 encapsulation, filling pilot medium.The internal lead 17 of sensitive element 7 and outer lead 19 contacts, barrier enclosure are in protective jacket 21, and outer lead 19 is encapsulated in the terminal box 20 with the contact of output line, and each contact complete closed is isolated, and prevent that it from contacting with the boundary.Sensor shell 22 is communicated with measured medium by last connecting pipe 3 with reference to the sealed cavity of pressure side.In order to improve the antiseptic property to tested strong acid, highly basic class corrosive medium, the anticorrosion lining 24 of anticorrosion lining 2 corresponding surface-coated in housing 15 upper ends and sealing gland 1 makes the leakage that can not produce corrosive medium with reference to the pressure side sealed cavity.Sensor shell 22 all with anticorrosive packing 23 (as the sealed insulation resin etc.) filling encapsulation, prevents that corrosive medium from leaking with reference to the transition rings 6 of pressure side encapsulation, press mold ring 4.The transition rings 8 of sensor shell 22 pressure measurement ends encapsulation, press mold ring 10 and the following connecting pipe 11 that press mold ring 10 and balance cover 12 are connected utilize sealing bush 13 and anticorrosive packing 16 fillings, prevent that corrosive medium from leaking.

During use, the seal flange 14 that end face is had sealing bush 13 linings is encapsulated on the band pressure vessel of tested strong acid, highly basic class corrosive medium, when wide-mouth balance cover 12 is put into measured medium, air in balance cover 12 wide-mouth inner chambers and following connecting pipe 11 endoporus is compressed, the pressure that the measured medium liquid level produces passes to the pressure measurement end of sensitive element 7, and the background pressure in the container passes to the reference pressure side of sensitive element 7 by last connecting pipe 3.At this moment, the electric signal of sensitive element 7 output through the signal amplification/display device of terminal box 20 or send into secondary instrument and handle, can accurately be measured the interior strong acid of band pressure vessel, the liquid level of highly basic class corrosive medium.

Claims

1, a kind of corrosion-resistant band pressure vessel liquid level sensor, comprise the housing and interior sensor shell, the sensitive element of assemble case that have sealing gland, seal flange and terminal box, it is characterized in that sensor shell pressure measurement end, utilize press mold ring seal dress isolation diaphragm respectively with reference to the transition rings of pressure side, filling pilot medium between two isolation diaphragms, the inside and outside lead contact of sensitive element, barrier enclosure is communicated with measured medium by last connecting pipe with reference to the sealed cavity of pressure side in protective jacket.

2, sensor according to claim 1 is characterized in that the press mold ring of sensor shell pressure measurement end and with the following connecting pipe that press mold ring and balance cover are connected, utilizes the encapsulation of sealing bush and anticorrosive packing.

3, sensor according to claim 1 is characterized in that housing upper end and the interior anticorrosion lining of the corresponding surface-coated of anticorrosion lining of sealing gland.

4, sensor according to claim 1 is characterized in that transition rings, press mold ring that sensor shell encapsulates with reference to pressure side utilize anticorrosive packing filling encapsulation.