KR20160031761A

KR20160031761A - Tape type gas detection sensor with ceramic composite

Info

Publication number: KR20160031761A
Application number: KR1020140121858A
Authority: KR
Inventors: 유홍근
Original assignee: (주)유민에쓰티
Priority date: 2014-09-15
Filing date: 2014-09-15
Publication date: 2016-03-23

Abstract

The present invention relates to a gas detection sensor. More specifically, the objective of the present invention is to provide a tape type gas detection sensor using a ceramic composite which can detect a leaking LNG gas and a leaking LPG gas promptly by constituting a gas sensor to detect the LNG gas and the LPG gas in a tape type, and surrounding a connection part of a pipeline with the gas sensor or attaching the gas sensor to a welded portion of a tank lorry directly or attaching the gas sensor to an indoor or outdoor wall or bottom where gas leakage is expected. The tape type gas detection sensor using a ceramic composite of the present invention to achieve the above objective comprises: a base film layer which is made of a film material; and a pair of conductive lines which are formed in parallel with each other on an upper plane of the base film layer in a longitudinal direction. One of the conductive lines comprises a ceramic composite paste where 80-95 wt% of graphene, 2.5-15 wt% of titanium oxide and 2.5-15 wt% of silica are mixed.

Description

TECHNICAL FIELD [0001] The present invention relates to a tape type gas detection sensor using a ceramic composite,

The present invention relates to a gas sensing sensor, and more particularly, to a tape-type gas sensing sensor using a ceramic composition for sensing LNG and LPG gas.

LNG, LPG, etc. can be burned so that many fuels such as home and industry are used, and when transported or stored, they are in a liquefied state under high pressure.

However, if containers are damaged during transport or storage, there is a great risk of major accidents such as explosion and fire accidents where high pressure gas is ejected.

In particular, when a long distance is transported, many pipelines are used, and the most gas leakage occurs at the connection portions of the pipes.

In order to prevent such a large accident, the gas sensor can immediately alert the gas sensor when it is leaked. Such a conventional gas sensor is disclosed in Japanese Patent Laid-Open No. 1998-050398, and FIGS. 1 and 2 Is a diagram showing the structure of such a gas sensor.

As shown in Figs. 1 and 2, a conventional gas sensor has a support rod 2 formed at a lower portion of the body 1, A temperature compensating portion 3 made of a platinum coil and a support 5 for supporting the coil of the active portion 4 are provided on the body 1.

At this time, the alumina carrier 7 in which the catalyst containing chlorine is permeated is integrally enclosed in the temperature compensating part 3 and the active part 4 coil.

Further, the catalyst is constituted by combining PdO and Pt black obtained by using [Pd (NH 3) b] (NO 3) a and [Pt (NH 3) b] (NO 3) a, and the alumina carrier 7 is formed into a cylindrical shape A through hole 8 is formed in the inside thereof, and an applied voltage of 3 V (± 10%) is applied.

Therefore, it is possible to detect gas by contact combustion.

However, such a conventional gas sensor is in the form of a single device, which is installed only in a very limited room, and is not applicable to a welding portion of a gas transportation vehicle such as a connecting portion of a pipeline or a tank lorry, .

In order to solve the problems of the related art, a gas sensor for detecting LNG and LPG gas in the form of a tape is installed to cover a connection part of a pipeline or directly to a welding part such as a tank lorry, The present invention provides a tape type gas sensing sensor using a ceramic composite that is installed on a wall or floor of an indoor or outdoor unit to instantaneously detect leaked LNG and LPG gas.

In order to accomplish the above object, there is provided a tape type gas sensing sensor using a ceramic composite,

A base film layer made of a film material;

And a pair of conductive lines formed in parallel on the upper surface of the base film layer in the longitudinal direction,

One conductive line of the conductive lines is formed of a ceramic composite paste having 80 to 95% by weight of graphene, 2.5 to 15% by weight of titanium oxide, and 2.5 to 15% by weight of silica.

According to the present invention, since the conductive line formed by the ceramic composite paste reacts with the gas such as LNG or LPG to change the resistance value, the leakage of the gas can be accurately detected by the changed resistance value, It is attached directly to a welding part such as a connecting part of a pipe or a tank, and is easily attached to a wall or a floor of an indoor or outdoor area, so that the installation is easy.

In addition, since it is manufactured by chemical treatment, the manufacturing cost is low and the price competitiveness is excellent.

1 and 2 are views showing the structure of a conventional gas sensing sensor.
3 is a view showing a decomposition structure of a gas sensing sensor according to the present invention.
4 is a view showing the laminated state of the present invention.

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a view showing the decomposition structure of the present invention. FIG. 4 is a laminated state view of the present invention. The gas sensing sensor 100 of the present invention includes a base film layer 110, conductive lines 111 and 112, Layer 120 as shown in FIG.

The base film layer 110 is a layer on which the conductive lines 111 and 112 are formed and may be formed of PET, PE, PI, PC, PTFE, PVC or other Teflon series As shown in Fig.

The conductive lines 111 and 112 are disposed in strips parallel to each other in the longitudinal direction spaced apart from each other on the upper surface of the base film layer 110. One conductive line 111 is formed of a conductive ceramic composite paste Paste), and another conductive line 112 is formed by printing with a conductive ink or silver compound.

At this time, one ends of the two conductive lines 111 and 112 are electrically connected to each other.

The ceramic composite paste for forming the conductive line 111 is a mixture of graphene, titanium oxide (TiO 2), and silica (SiO 2). The conductive paste is composed of 80 to 95% by weight of graphene as a conductive binder, 2.5 to 15% by weight of titanium oxide as a raw material, and 2.5 to 15% by weight of silica as a reactant for controlling sensing sensitivity are mixed.

Since LNG and LPG gas are mainly composed of carbon (C) and hydrogen (H), hydrogen (H) reacts with O2 constituting titanium oxide to generate water. The resistance value is changed.

In this case, in order to control the reaction sensitivity of the conductive line 111 in the case of silica, it is possible to control the reaction sensitivity of titanium oxide according to the mixing amount.

The upper protective film layer 120 is laminated by lamination on the upper part of the base film layer 110 to protect the conductive lines 111 and 112 from external stimuli. Like the base film layer 110, A sensing hole 121 may be formed at a predetermined distance in a position corresponding to the conductive line 111. The sensing hole 121 may be formed of a material such as PI, PC, PTFE, PVC or other Teflon material.

In particular, the upper protective film layer 120 may be laminated in order to protect the conductive lines 111 and 112, and the upper protective film layer 120 may be selectively laminated depending on circumstances. It may not be laminated.

The sensing process of the gas sensing sensor 100 will be described with an example in which the upper protective film layer 120 is laminated.

Since the gas sensing sensor 100 of the present invention is in the form of a tape, it can be wound or attached on a welded portion of a connection portion of a pipe through which LNG or LPG moves, a storage tank such as a storage tank or a tank lorry, or an LNG or LPG Or may be attached to a wall or floor of an outside room.

Therefore, when the gas leaks and flows into the sensing hole 121 of the upper protective film layer 120, the leaked gas comes into contact with the conductive line 111 made of the ceramic composite paste. At this time, The line 112 is electrically connected to one end of the line and the other end is connected to the controller through a connector to form a closed circuit. Therefore, the conductive line 111 is conductive, and water The resistance value is lowered.

That is, the conductive line 111 is in a state having a predetermined resistance value before being contacted with LPG or LNG by graphene, but when the LPG or LNG is contacted, the resistance value changes due to the reaction of titanium oxide and silica will be.

Therefore, the change in the resistance value is notified to the remote unit through the conductive line 112, which is a signal line, so that the leakage state of the gas can be confirmed.

100: Gas sensor
110: base film layer 111, 112: conductive line
120: upper protective film layer 121: sensing hole

Claims

A base film layer made of a film material;
And a pair of conductive lines formed in parallel on the upper surface of the base film layer in the longitudinal direction,
Wherein one of the conductive lines is constituted by a ceramic composite paste in which graphene, titanium oxide, and silica are mixed.

The tape-shaped gas sensing device according to claim 1, wherein the ceramic composite paste comprises a mixture of 80 to 95% by weight of graphene, 2.5 to 15% by weight of titanium oxide, and 2.5 to 15% .

The method according to claim 1, wherein an upper protective film layer made of a film material is laminated on the upper surface of the coating layer, and a sensing hole is formed in the upper protective layer at a position corresponding to a conductive line made of a ceramic composite paste Tape type gas sensing sensor using ceramic composite features.