CN2456165Y

CN2456165Y - Electrochemical carbon oxide sensor

Info

Publication number: CN2456165Y
Application number: CN 00265004
Authority: CN
Inventors: 倪丕芬; 林荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-09
Filing date: 2000-12-09
Publication date: 2001-10-24
Anticipated expiration: 2010-12-09

Abstract

The utility model relates to an electrochemical carbon oxide sensor. The interior of a casing body is a liquid chamber, and the upper side of the casing body is provided with a lower electrode slice, a lower induction electrode, a middle insulating and isolating layer, an upper induction electrode, an upper electrode slice and an outer cover. A catalyst film is applied on the upper surface of the lower induction electrode and used as the lower corresponding electrode, and the catalyst film is applied on the lower surface of the upper induction electrode and used as the upper corresponding electrode. The lower electrode slice is provided with a liquid permeation hole, and the upper electrode slice is provided with an air inlet. The interior of the outer cover is an air filtering chamber. The utility model has the advantages of firmness, reliability and long service life, and besides, the utility model can not generate mistake signal for alcohol and humidity change in the air.

Description

Electrochemical carbon monoxide sensor

The utility model relates to a carbon monoxide sensor, in particular to an electrochemical carbon monoxide sensor.

The majority of the annual deaths from gas poisoning are reported to be carbon monoxide. Carbon monoxide is a colorless, tasteless and extremely toxic gas, can destroy the oxygen supply capacity of a human body, can cause poisoning symptoms such as dizziness, headache, nausea, vomit, somnolence, coma and the like when the carbon monoxide is gathered in the blood of the human body and reaches a certain concentration, and can cause nerve damage to become a plant or die seriously, so that the design of the carbon monoxide sensor with excellent performance is of great significance. The sampling sensor in the "carbon monoxide detection alarm protection instrument" (ZL91204769, terminated) is a UL281 conductor CO probe. The sensor used in the "home carbon monoxide alarm" (ZL91229585, terminated) used an HQ-5 type gas sensitive device. The sensor in the "optical fiber type carbon monoxide detection alarm" (ZL92215656, terminated) comprises a wet gas sensor and an optical sensing assembly in which a palladium sulfate-ammonium silicomolybdate solution is placed in a light-transmitting container. A "carbon monoxide detection sensor" (97112594, trial) is composed of a gas detector portion and an electrode member. The gas sensor used in the carbon monoxide alarm (ZL98212325) is a thermal limit type sensitive element.

In fact, the carbon monoxide sensor used in the international market is mainly a tin oxide sensor, and the countries and regions in which it is used are the north american countries such as japan, europe, canada, and the like and some regions of the united states. The tin oxide sensor adopts a tin oxide semiconductor principle, tin oxide must be heated in work, the requirement on the environment is strict, and error signals can be generated on the humidity in alcohol and air; the life time depends on the life time of the heating wire and the platinum wire transmitting signals therein, and is not shock-resistant.

The utility model aims at providing an electrochemistry carbon monoxide sensor, it is firm reliable, and longe-lived can not produce the error signal to the humidity change in alcohol and the air.

For accomplishing the above task, the utility model discloses the solution of taking is: an electrochemical carbon monoxide sensor is composed of a liquid chamber in a casing, lower and upper electrode plates, insulating isolating layer, upper and lower induction electrodes, and a casing with liquid permeable holes, gas filtering chamber in the casing, and catalyst film coated on the upper surface of lower induction electrode and lower surface of upper induction electrode.

It has the following positive effects:

it is designed as a combination of electrochemical pumps, and can be regarded as a carbon monoxide-hydrogen fuel cell, and its correspondent electrode, i.e. catalytic electrode, is directly combined on the surface of induction electrode, and the carbon monoxide can be used for making electrochemical reaction on the induction electrode and oxidizing it, and the proton produced on the induction electrode can be converted in interiorAcross the surface to the counter electrode, i.e. atOne side of the induction electrode: and one side of the corresponding electrode: and integrally: it is assumed that the upper and lower cells are constructed such that the concentration of carbon monoxide can be detected by measuring the voltage difference between the two cells. It can be seen from the above working principle that the sensor does not generate signals to the concentration change of alcohol and water, so that the carbon monoxide detector or the alarm made of the sensor has low requirements on the environment, such as being completely placed in a foggy bathroom, and therefore, the application range of the carbon monoxide detector or the alarm is wider than that of the existing carbon monoxide sensor. Moreover, the product can be made into firm and reliable products, and has long service life which can reach more than ten years.

The present invention will be described with reference to the following embodiments and accompanying drawings.

Fig. 1 is a schematic structural diagram of the present embodiment.

In the figure, 1, a shell, 2, a lower electrode external connection wire, 3, a pressing ring, 4, a sealing gasket, 5, an outer cover, 6, an upper electrode external connection wire, 7, a gas filtering chamber, 8, a filtering gasket, 9, an air inlet hole, 10, an upper electrode plate, 11, an upper induction electrode, 12, an upper corresponding electrode, 13, a middle insulating isolation layer, 14, a lower corresponding electrode, 15, a lower induction electrode, 16, a lower electrode plate, 17, a liquid permeation hole, 18 and a liquid chamber.

As shown in figure 1, an electrochemical carbon monoxide sensor is characterized in that a liquid chamber 18 is arranged in a shell 1, a lower electrode plate 16, a lower induction electrode 15, a middle insulating isolation layer 13, an upper induction electrode 11, an upper electrode plate 10 and an outer cover 5 are arranged on the liquid chamber, a catalyst film is coated on the upper surface of the lower induction electrode 15 to serve as a lower corresponding electrode 14, a catalyst film is coated on the lower surface of the upper induction electrode 11 to serve as an upper corresponding electrode 12, a liquid permeation hole 17 is formed in the lower electrode plate 16, an air inlet hole 9 is formed in the upper electrode plate 10, and a gas filter chamber 7 is arranged in the outer cover 5. An upper electrode external connection wire 6 is led out from the upper electrode plate 10, and a lower electrode external connection wire 2 is led out from the lower electrode plate 16. The housing 1 and the outer cover 5 are hermetically combined by a gasket 4 and a peripheral pressing ring 5. The upper electrode plate 10 and the lower electrode plate 16 are made of stainless steel.

Claims

1. An electrochemical carbon monoxide sensor, characterized by: a liquid chamber (18) is arranged in a shell (1), a lower electrode plate (16) and a lower induction electrode (15), a middle insulation isolation layer (13), an upper induction electrode (11), an upper electrode plate (10) and a housing (5) are arranged on the liquid chamber, a catalyst film is coated on the upper surface of the lower induction electrode (15) and serves as a lower corresponding electrode (14), a catalyst film is coated on the lower surface of the upper induction electrode (11) and serves as an upper corresponding electrode (12), a liquid permeation hole (17) is formed in the lower electrode plate (16), an air inlet hole (9) is formed in the upper electrode plate (10), and a gas filter chamber (7) is arranged in the housing (5).

2. An electrochemical carbon monoxide sensor according to claim 1, wherein: an upper electrode external connecting wire (6) is led out from the upper electrode plate (10), and a lower electrode external connecting wire (2) is led out from the lower electrode plate (16).

3. An electrochemical carbon monoxide sensor according to claim 1, wherein: the shell (1) and the outer cover (5) are hermetically combined by a sealing gasket (4) and a pressing ring (5) at the periphery.

4. An electrochemical carbon monoxide sensor according to claim 1 or 2, wherein: the upper electrode plate (10) and the lower electrode plate (16) are made of stainless steel materials.