CN202041342U

CN202041342U - Electric insulation structure of differential metal capacitance bellows and metal shell assembly

Info

Publication number: CN202041342U
Application number: CN201120124810XU
Authority: CN
Inventors: 张惠益
Original assignee: FUJIAN SHANGRUN PRECISION INSTRUMENT Co Ltd
Current assignee: FUJIAN SHANGRUN PRECISION INSTRUMENT Co Ltd
Priority date: 2011-04-21
Filing date: 2011-04-21
Publication date: 2011-11-16
Anticipated expiration: 2021-04-21

Abstract

The utility model discloses an electric insulation structure of a differential metal capacitance bellows and a metal shell assembly, belonging to the structure of a differential metal capacitance bellows in the series of pressure sensors. A half cup body is provided; the outer end of the half cup body is provided with a protective ring and an isolation diaphragm, and the inner end of the half cup body is connected with a ceramic ring plate; the inner end of the ceramic ring plate is connected with a metal ring plate; inner cavities of the half cup body, the ceramic ring plate and the metal ring plate are connected with glass; an oil charging pipe is arranged in the glass; a ceramic pipe with through holes is axially arranged in the middle of the half cup body, the ceramic ring plate, the metal ring plate and the glass; the head end surface of the oil charging pipe in the glass, the head end surface of the ceramic pipe with through holes in the glass and the glass are positioned on a same concave cambered surface; the inner end surface of the concave cambered surface is plated with an electric conductor body layer and an insulation protective layer; and the inner end of the concave cambered surface is further provided with a central metallic diaphragm. The electric insulation structure solves the problem that the sensing element of the capacitive differential pressure transmitter and the metal shell of the capacitive differential pressure transmitter are greatly electrically isolated, thereby improving the capacity of resisting disturbance and the stability.

Description

The electrically insulated structures of a kind of differential metal capacitance bellows and metal shell assembly

Technical field

The utility model relates to the structure of the differential metal capacitance bellows that uses in the pressure transducer series of industrial automation product, the electrically insulated structures of a kind of specifically differential metal capacitance bellows and metal shell assembly.

Background technology

Electronic equipment, Switching Power Supply, computing machine etc. in use can produce interference such as noise, especially in the course of the work information obtains, transmits, when changing, when signal circuit two ends all during ground connection, because there is potential difference (PD) in the place, two ends, will form the vagabond current loop, vagabond current becomes interference voltage through signal wire resistance, causes interference for the differential pressure transmitter metering circuit of using the manufacturing of differential metal capacitance bellows.Therefore adopt differential pressure transmitter that the sensing element of the novel isolation structure of differential metal capacitance bellows makes with the reliability of the antijamming capability that improves the metal capacitance differential pressure transmitter and system show very important.

Existing metal capacitance differential pressure transmitter is mainly by silicone oil, connecting pipe is delivered to the central metal diaphragm with the variation of external pressure, make the central metal diaphragm produce certain displacement, like this central metal diaphragm with it the electric capacity between the conductive layer pole plate of both sides change, the changes in capacitance amount is linked the current signal of the standard that is converted to again on the electronic circuit through lead separately, what will specify here is existing metal capacitance differential pressure transmitter aufbauprinciple, make central metal diaphragm and transmitter use the ground wire of mounting points or connect together greatly all the time, therefore on-the-spot interference electric signal is easy to make the electric capacity of central metal diaphragm both sides to change, cause differential pressure transmitter anti-interference, measuring accuracy and stability are all relatively poor.

The utility model content

In order to overcome the defective of prior art, the purpose of this utility model is the electrically insulated structures that a kind of simple in structure, easy to make, safe in utilization, reliable a kind of differential metal capacitance bellows and metal shell assembly will be provided.

The technical scheme that its technical matters that solves the utility model adopts is: the electrically insulated structures of a kind of differential metal capacitance bellows and metal shell assembly, it is characterized in that: a metal half cup body is arranged, the outer end of half cup body is provided with protective ring and isolation diaphragm, the inner of half cup body is connected with ceramic ring plate, pottery ring plate the inner is connected with the metal ring plate, the half cup body, the pottery ring plate, the inner chamber of metal ring plate is connected with the glass that head is a concave body, be provided with oil filler pipe in the glass, the half cup body, the pottery ring plate, the intermediate shaft of metal ring plate and glass is to being provided with the multi-through hole ceramic pipe, oil filler pipe head end in the glass, multi-through hole ceramic pipe head end and glass are on same cancave cambered surface in the glass, the cancave cambered surface inner face is coated with conductor layer and insulating protective layer, and cancave cambered surface the inner also is provided with the central metal diaphragm.

Described insulator is stupalith and glass.

Described multi-through hole ceramic pipe is provided with 1～20 through hole in the middle of it.

The utility model is to utilize existing known technology that glass and multi-through hole ceramic pipe and half cup body and ceramic ring plate and metal ring plate and oil filler pipe are sintered into one; Grind a cancave cambered surface by grinding technics then, then on cancave cambered surface, plate conductor layer respectively and plate insulating protective layer again, form half cup body assembly by technique for vacuum coating.

The utility model utilization welding is welded into one isolation diaphragm, protective ring, center diaphragm and half cup body assembly.Introducing silicone oil by oil filler pipe again makes silicone oil be full of whole room by the multi-through hole ceramic pipe.

During work when external pressure is applied to isolation diaphragm, by silicone oil pressure is passed to the central metal diaphragm, the central metal diaphragm will produce certain displacement, therefore the electric capacity that is made of the conductor layer on central metal diaphragm and its both sides will change, and electric capacitance change offers circuit by central metal diaphragm extension line and conductor layer via the oil filler pipe extension line.The variation of final external pressure is converted to capacitance variation.Be converted into the output signal of standard again by circuit.

The beneficial effects of the utility model are: it is anti-interference that the utility model has solved existing differential pressure transmitter, measuring accuracy and all relatively poor problem of stability utilize insulating material such as pottery etc. with the sensing element (bellows) of capacitance differential pressure cell and the metal shell electricity isolation structure of capacitance differential pressure cell.Half cup body inter-module welds the access insulating material respectively on both sides---ceramic ring plate, glass, the another side of half cup body is with isolation diaphragm and protective ring welding, the metal ring plate of dead center metallic membrane has just insulated with the protective ring of its both sides like this, played the isolation action of electric signals, when by pressure measurement with when affacting on the isolation diaphragm of differential capacitor bellows both sides respectively, silicone oil in the bellows is by the multi-through hole ceramic pipe, be delivered to central metal diaphragm both sides with liquid pressure transmission form, both kept the constant of differential capacitor bellows principle of work.Therefore, the utility model has solved sensing element and the metal shell of capacitance differential pressure cell and the problem that the earth needs electricity to isolate of capacitance differential pressure cell, has improved the antijamming capability and the stability of capacitance differential pressure cell greatly.

Description of drawings

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

Fig. 1 is the topology view of the utility model full section.

Fig. 2 is the left view of the utility model Fig. 1.

Fig. 3 is the vertical view of the utility model Fig. 1.

Fig. 4 is the A-A zoomed-in view of the utility model Fig. 1.

Among the figure: 1 isolation diaphragm, 2 multi-through hole ceramic pipes, 3 protective rings, 4 half cup bodies, 5 oil filler pipes, 6 ceramic ring plates, 7 metal ring plates, 8 glass, 9,11,12 circumferential welds, 10 silicone oil, 13 central metal diaphragm extension lines, 14 oil filler pipe extension lines, 15 central metal diaphragms, 16 conductor layers, 17 insulating protective layers.

Embodiment

Embodiment 1:

See also accompanying drawing, a metal half cup body 4 is arranged, the outer end of half cup body 4 is provided with protective ring 3 and isolation diaphragm 1, the inner of half cup body 4 is connected with ceramic ring plate 6, pottery ring plate 6 the inners are connected with metal ring plate 7, half cup body 4, pottery ring plate 6, the inner chamber of metal ring plate 7 is connected with the glass 8 that head is a concave body, be provided with oil filler pipe 5 in the glass 8, half cup body 4, pottery ring plate 6, the intermediate shaft of metal ring plate 7 and glass 8 is to being provided with multi-through hole ceramic pipe 2, oil-filled 5 tube head end faces in the glass 8, multi-through hole ceramic pipe 8 head end and glass 8 are on same cancave cambered surface in the glass 8, the cancave cambered surface inner face is coated with conductor layer 16 and insulating protective layer 17, and cancave cambered surface the inner also is provided with central metal diaphragm 15.Among the figure: 9,11,12 be labeled as circumferential welds, 10 is that silicone oil, 13 is central metal diaphragm extension line, 14 is the oil filler pipe extension line.

Claims

1. the electrically insulated structures of differential metal capacitance bellows and metal shell assembly, it is characterized in that: a metal half cup body is arranged, the outer end of half cup body is provided with protective ring and isolation diaphragm, the inner of half cup body is connected with ceramic ring plate, pottery ring plate the inner is connected with the metal ring plate, the half cup body, the pottery ring plate, the inner chamber of metal ring plate is connected with the glass that head is a concave body, be provided with oil filler pipe in the glass, the half cup body, the pottery ring plate, the intermediate shaft of metal ring plate and glass is to being provided with the multi-through hole ceramic pipe, oil filler pipe head end in the glass, multi-through hole ceramic pipe head end and glass are on same cancave cambered surface in the glass, the cancave cambered surface inner face is coated with conductor layer and insulating protective layer, and cancave cambered surface the inner also is provided with the central metal diaphragm.

2. the electrically insulated structures of a kind of differential metal capacitance bellows according to claim 1 and metal shell assembly is characterized in that: described multi-through hole ceramic pipe is provided with 1～20 through hole in the middle of it.