CN2192036Y

CN2192036Y - Smoke heating sensing device

Info

Publication number: CN2192036Y
Application number: CN 94209442
Authority: CN
Inventors: 赵金宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-27
Filing date: 1994-04-27
Publication date: 1995-03-15
Anticipated expiration: 2004-04-27

Abstract

The key factor for causing the people to be toxic is that the content of the CO gas of the fume of the domestic gas combustion water heater is overproof. The utility model provides a gas sensor which is used for monitoring the content variation of the CO of the fume. The utility model outputs an electrical signal to an externally connected control circuit, and then realizes the purposes of alarm and automatic gas passage cutting. The utility model uses a sintered body which is made of metal-oxide semiconductor material and is hung and barely mounted. Electrodes on both sides are welded on a guide column which is made of nickel-chromium material. The guide column is fixed on a porcelain seat which is made of heat-resisting insulating ceramic. The utility model has the advantages of simple structure, high-temperature resistance, high-moisture resistance, corrosion resistance and long service life.

Description

Smoke heating sensing device

The utility model belongs to the gas sensor structural design, particularly a kind of flue gas heat air dependent sensor that is used for domestic gas-fired water heater monitoring flue gas CO gas content.

Gas sensor is the sensor that is used to detect all gases.It is little, highly sensitive that semiconductor gas sensor has a volume, and advantage such as easy to use is developed rapidly in actual applications.The application of gas water heater is more and more general, but because the safety prevention measure imperfection often has human casualty accident to take place in application.Combustion gas circle the expert think, to exceed standard be the key factor that causes personal poisoning injures and deaths to the CO gas content in the flue gas of burning back.Therefore, how to monitor CO content in smoke, and realize that when exceeding standard reporting to the police with cutting off fuel gas path automatically is an important subject.

According to data " semiconductor transducer " (referring to P255～302, publishing house of University Of Tianjin 1992) introduces, utilize semiconductor gas sensor can detect the CO gas concentration, and have highly sensitive, the characteristics that response speed is fast, through we research and experimental results show that: utilize gas sensor directly to monitor the variation of the CO gas content in the gas heater flue gas, and change it into electric signal and be defeated by control circuit, when exceeding standard, the device that can realize reporting to the police and automatically cut off fuel gas path has many advantages, and satisfies the industry standard requirement of related city gas heater fully.(this monitoring technology and device---gas heater CO exceed standard automatic disconnecting device, inventor's patent applied for).But also find simultaneously to utilize existing gas sensor directly to be used in and have in the combustion gas flue gas fragile, perishable, non-refractory, short shortcoming of life-span, particularly under the medium and high temperature condition of work.

The purpose of this utility model provides a kind of flue gas heat air dependent sensor of high temperature resistant, corrosion-resistant, long service life, is beneficial to its applying on the gas heater safety device.

Fig. 1, flue gas heat air dependent sensor structural representation

Fig. 2, sno2 gas sensor structural representation

The utility model mainly is the semi-conducting material (it is constant to fill a prescription) that utilizes existing gas sensor, structurally improves design, to adapt to the specific (special) requirements of flue gas. Be structural representation of the present utility model such as Fig. 1, its mainly by 1, the MOS sintered body; 2, electrode; 3, guide pillar; 4, the porcelain seat forms. For ease of relatively, now provide a kind of structural representation (shown in 2) of sno2 gas sensor commonly used, among the figure: 6, stainless steel dual network; 7, lead-in wire; 8, sno2 semi-conducting material; 9, heater coil; 10, pedestal; 11, pin.

Now in conjunction with the accompanying drawings 1,2, how the comparative illustration the purpose of this utility model realizes.

1, utilize the semiconductor material (it is constant to fill a prescription) of sno2 gas sensor to make the MOS(metal oxide semiconductor material of overstriking thickening) sintered body 1, to improve its permanance; Owing to be to utilize hot flue gas heating, do not need additional heating source, so cancelled the heater coil 9 in the former device.

2, the stainless steel dual network 6 of the former device of cancellation influences use to avoid dust to stop up mesh.The utility model adopts MOS sintered body 1 unsettled, the exposed installation, helps the flue gas heating on the one hand, has both made part fall to having dust on the other hand, still can normally use.

For increasing the contact area of MOS sintered body 1 and electrode 2, sintered body is made I-shaped closely cooperating with the convex shape electrode and is contacted (as shown in Figure 1).

3, the lead-in wire of 1 of the electrode of former device and pin one is a fine wire, has only 005～008mm frangibility, perishable.The utility model is that two lateral electrodes 2 directly are welded on the both sides guide pillar 3, guide pillar is whittled into a plane, long-pending to increase with electrode contact surface, strengthen weld strength, improved permanance (as shown in Figure 1), guide pillar adopts high temperature resistant, the erosion-resisting nickel chromium triangle material of φ 2mm to make simultaneously.

4, the pedestal 10 that former electricity consumption wood material is made changes the oblate cylindricality porcelain seat made from the high temperature insulation stupalith 4 into, to adapt to the condition of work requirement of high temperature, high humidity.

In sum, as shown in Figure 1, the utility model is the semiconductor material system MOS sintered body that utilizes former sno2 gas sensor, unsettled, the exposed installation, its two lateral electrode 2 is welded in respectively on the both sides guide pillar 3, two guide pillars are packed on the porcelain seat 4, and guide pillar is provided with the anti-rotation groove, closely cooperate fixing with the porcelain seat.The porcelain seat can cooperate installation with the gas sensor socket of special use, and two guide pillars link to each other with external circuit.

Be not difficult to find out that the utility model is compared with existing gas sensor, not only simplifies the structure, and has saved the energy, and improve the performance of corrosion stability, high temperature resistant, anti-high humidity, prolonged serviceable life.Through our experimental results show that, the utility model can be used for that the CO gas content detects in the flue gas of all types of gas water heaters, both made under the hypoxemia situation (flue gas oxygen content is lower than below 335%) also can operate as normal, this be that existing gas sensor is incomparable.

Claims

1, a kind of flue gas heat air dependent sensor that uses metal oxide partly to lead material is characterized in that the unsettled exposed installation of MOS sintered body (1) of being made by semiconductor material, and two lateral electrodes (2) are welded on the guide pillar (3), and guide pillar is packed on the porcelain seat (4).

2, sensor as claimed in claim 1 is characterized in that described guide pillar (3) made by the nickel chromium triangle material.

3, sensor as claimed in claim 1 is characterized in that described porcelain seat (4) made by the high temperature insulation stupalith.