CN113295755B - A Sampling Type Rapid Primary Battery Oxygen Sensor - Google Patents

Abstract

The invention discloses a sampling type rapid oxygen sensor for a galvanic cell, which comprises an external main shell and an upper cover plate shell, wherein an air inlet and an air exhaust opening are formed above the upper cover plate shell, a space between the upper cover plate shell and the main shell forms a sensing air chamber of the galvanic cell, after external gas enters the sensing air chamber through the air inlet, oxygen in the gas enters a reaction air chamber through an oxygen permeable membrane for chemical reaction, and other impurity gases flow out through a plurality of micropores on the edge and are pumped away through the air exhaust opening via an air exhaust cavity. The reaction gas chamber comprises an anode rod and a microporous cathode. The sponge block with adsorbability is placed in the reaction air chamber and attached to the anode rod and the microporous cathode, and after the electrolyte is consumed in use, the sponge block ensures that the microporous cathode and the anode rod still have the electrolyte to be transferred to the electrode for reaction. The pressure balance air chamber ensures that the electrolyte in the reaction air chamber can not overflow, and the oxygen permeable membrane is not stressed and is not easy to break away from and break, thereby prolonging the service life of the sensor.

Description

A Sampling Type Rapid Primary Battery Oxygen Sensor

technical field

The invention relates to the field of medical oxygen sensors, in particular to a sampling type fast original battery oxygen sensor.

Background technique

The analysis and determination of oxygen is widely used in laboratory, biology, medicine, chemical industry, energy and many other fields. Oxygen sensor is the most researched and most mature type of sensor among all gas sensors.

Oxygen sensors can be divided into electrochemical oxygen sensors, optical fiber oxygen sensors, thermomagnetic oxygen sensors, semiconductor resistive oxygen sensors, etc. according to different working principles. Electrochemical oxygen sensors usually use electrochemical reactions to measure oxygen. This type of sensor has the advantages of high sensitivity, wide measurement range, and short response time. It is widely used in chemical, medical, biological, and military fields. It is the most mature technology at present. The most widely used oxygen sensor.

Due to the problem of the ventilation structure of the existing electrochemical oxygen sensor, the dead space will be large, which will affect the response speed of the sensor; the temperature change difference during the measurement process will cause the internal pressure to increase, and the increase in pressure will lead to electrolysis. If the liquid clogs or even leaks out of the air intake hole, the sensor cannot be air-intaked and fails.

Contents of the invention

The object of the present invention is to provide a sampling type fast original battery oxygen sensor in order to remedy the defects of the prior art.

The present invention is achieved through the following technical solutions:

A sampling type fast original battery oxygen sensor, its main structure includes an upper cover shell 1 and a main shell 2; the upper cover shell part: the upper cover shell 1 contains an air inlet 9 and an air suction port 10 , the air inlet 9 is thinner than the air inlet 10, and there is a cylinder 19 inside the upper cover shell 1, and the air inlet 9 corresponds to the center of the cylinder, and the gas enters the sensor's induction chamber 13 through this channel . The periphery of the cylinder 19 contains a plurality of micropores. Main housing part: the upper part of the main housing includes a raised spacer 20, a plurality of air outlet micropores 21 and an oxygen-permeable membrane 3 made of polytetrafluoroethylene, and the reaction gas chamber 12 of the sensor is under the oxygen-permeable membrane 3. The interior contains the microporous cathode 4 and the anode rod 7 under the oxygen-permeable membrane 3, respectively soaked in the electrolyte, and also contains a sponge block 8 that can absorb the electrolyte and a soft sealing membrane 6, and the soft sealing membrane 6 isolates the The reactant plenum 22 and the pressure equalization plenum 14 .

When assembling a sampling type fast original battery oxygen sensor, cover the upper cover shell 1 on the main shell 2, the edge 25 of the upper shell is completely attached to the edge 24 of the main shell, and the cylinder 19 inside the upper cover shell 1 It can be directly attached to the raised spacer 20 of the main shell 2. The oxygen-permeable membrane 3 is placed under the raised spacer 20. The air inlet 9 just corresponds to the oxygen-permeable membrane 3. Glue the upper cover shell 1 and sealed with the outer edge of the main housing to avoid the entry of external air. Two cavities are formed inside, a tiny reaction gas chamber 22 and an air extraction chamber 23 . When working, the external air enters the sensor through the air inlet 9, and the oxygen in the air enters the reaction gas chamber 22 through the oxygen-permeable membrane 3 to undergo a chemical reaction. Air port 10 is pumped away.

Further, the space between the upper cover shell 1 and the main shell 2 constitutes the induction gas chamber 13 of the primary battery.

Further, the pressure balance air chamber 14 isolated by a soft sealing film 6 inside the main housing 2 is provided with a pressure balance port 11 on the side of the balance air chamber 14, and when the sampling sensor is working, the air suction port 10 and the The pressure balance ports 11 are respectively connected with soft rubber tubes, and the two gas ports are connected through a three-way tube. The other port of the three-way tube is connected to a section of rubber tube and then extended through the three-way tube. One end is connected to an air pump 16 for pumping air. Processing, the other end is connected to the noise reduction pump 15 to eliminate the noise generated in the pumping process.

Further, an absorbent sponge block 8 is placed inside the reaction gas chamber 22 and soaked in the KOH solution, so that the microporous cathode 4 and the anode rod 7 can contact the sponge block 8 . Ensure that after the sensor is used and consumed for a long time, the cathode and anode can still come into contact with the electrolyte for chemical reactions.

Further, the material of the microporous cathode 4 is platinum metal; the material of the anode rod 7 is lead; the material of the oxygen permeable membrane 3 is polytetrafluoroethylene; and the electrolyte is KOH electrolyte 5 .

The advantages of the present invention are:

The structural design of a sampling type fast primary battery oxygen sensor makes the inner sealing of the sensor better, the gas flows smoothly after entering the sensor through the air inlet, and the residual time of the residual gas after the reaction is shorter. The internal tiny induction air chamber has a small dead space, which makes the response speed of the sensor short and quick. A pressure balance port is specially set. When the gas enters the induction chamber from the air inlet, the external pumping makes the pressure of the induction chamber and the balance chamber close, and the pressure on both sides of the oxygen-permeable membrane remains relatively equal. The membrane of the device Not easy to move or break. A sponge block that can absorb the electrolyte is placed inside the reaction gas chamber of the sensor to ensure that the microporous cathode and anode rods can continuously contact the KOH solution after a long period of use and consumption of the sensor, which improves the life of the sensor.

Description of drawings

Fig. 1 is the structural diagram of upper cover plate shell of the present invention not covered;

Fig. 2 is a gas flow circuit diagram during the work of the present invention;

Fig. 3 is an internal view of the upper cover shell of the present invention;

Fig. 4 is a structural diagram of the upper part of the main casing of the present invention;

Fig. 5 is a front view of the sensor of the present invention;

Fig. 6 is a structural diagram of the peripheral pressure balance device when the present invention works.

In the figure, 1 upper cover shell; 2 main shell; 3 oxygen permeable membrane; 4 microporous cathode; 5 KOH electrolyte; 6 soft sealing film; 7 anode rod; 8 sponge block; 9 air inlet; 10 pump Air port; 11 pressure balance port; 12 gas flow path; 13 induction chamber; 14 pressure balance chamber; 15 silencer pump; 16 suction pump; 17 tee pipe; 18 air pipe; 19 cylinder; 21 Air outlet micropore; 22 Reaction gas chamber; 23 Pumping cavity; 24 Edge of main shell; 25 Edge of upper shell; 26 Electrode leads.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and exemplary embodiments.

As shown in FIGS. 1-5 , the main structure of a sampling type rapid primary battery oxygen sensor includes an upper cover shell 1 and a main shell 2 . There is an air inlet 9 and an air inlet 10 above the upper cover shell 1. The air inlet 9 is thinner than the air inlet 10. The upper cover shell 1 contains an inner shell cylinder 19, and the air inlet corresponds to the At the center of the cylinder 19, cover the top cover shell 1 on the main shell 2, the edge 25 of the upper shell and the edge 24 of the main shell are completely fitted, the cylinder 19 of the top cover shell and the top of the main shell 2 The raised spacer 20 fits perfectly and can be embedded, and the edges of the upper cover shell 1 and the main shell 2 are bonded with glue to keep a sealed state and prevent external air from entering the inside of the sensor. The space between the upper cover shell 1 and the main shell 2 constitutes the induction gas chamber 13 of the primary battery. The flow path of the gas is shown in the gas flow path 12 shown in Figure 2 below. The gas enters the induction chamber 13 through the air inlet 9 through the inner shell cylinder 19, and the material below the inner shell cylinder 19 is 10- 20um thick polytetrafluoroethylene oxygen-permeable membrane 3, the oxygen in the gas enters the reaction gas chamber 22 of the sensor through the oxygen-permeable membrane 3 for chemical reaction. The remaining impurity gas is pumped by the suction pump 16, flows out from the gas outlet micropore 21 of the main housing 2, passes through the suction cavity 23, and is pumped out from the gas suction port 10. The special structural design makes the gas flow into the sensor smooth, and the gas after the reaction The residence time of the impurity gas is short, and the dead space of the tiny induction gas chamber 13 inside is small, which is beneficial to speed up the response speed of the sensor and improves the performance of the sensor.

The above-mentioned reaction gas chamber 22 includes a microporous cathode 4 below the oxygen-permeable membrane, the material of which is platinum metal, and the anode rod 7 located on the inner wall of the sensor side is made of lead material, and the sensor is drawn out through the electrode lead 26. The microporous cathode 4 and the anode rod 7 are soaked in the KOH electrolyte 5, and the reaction gas chamber 22 contains an absorbable sponge block 8, and the top and side of the sponge block 8 are respectively in contact with the microporous cathode 4 and the anode rod 7, It is ensured that after the sensor is used for a long time, after the electrolyte is consumed and lost, the energy source of the microporous cathode 4 and the anode rod 7 is continuously absorbed into the electrolyte to undergo a chemical reaction, which increases the service life of the sensor. The reaction of oxygen entering the reaction gas chamber 22 is: the reduction reaction occurs immediately when the oxygen reaches the microporous cathode 4, and the reaction equation is: O ₂ +2H ₂ O+4e ^- →4OH ^- . The generated hydroxide ions pass through the KOH electrolyte 5 and reach the anode rod 7 for an oxidation reaction. The reaction equation is 2Pb+4OH ^- →2PbO+2H ₂ O+4e ^- .

The bottom of the reaction gas chamber 22 of a sampling type rapid primary battery oxygen sensor uses a soft sealing film 6 to isolate a pressure balance gas chamber 14, and a pressure balance port 11 is arranged on the side of the balance gas chamber 14. When the sampling sensor is working, as shown in Figure 6, the structure diagram of the peripheral pressure balance device during the work of the present invention, the gas extraction port 10 and the pressure balance port 11 are respectively drawn by the air pipe 18, and the two ends of the three-way pipe 17 are used to connect the two nozzles. The other end of the three-way pipe 17 is connected with a section of rubber hose and then connected with the same three-way pipe. One end is connected to the rubber hose, the other end is connected to the air pump 16 for air extraction, and the remaining end is connected to the silencer pump 15 for air extraction. Noise removal works. During the pumping process, the induction air chamber 13 and the pressure balance air chamber 14 are close to the vacuum environment, and there are nearly equal negative pressures in the two air chambers. Therefore, the pressure difference between the induction gas chamber 13 and the balance gas chamber 14 is small, so that the electrolyte in the reaction gas chamber 22 will not overflow through the porous electrodes. Meanwhile, the oxygen-permeable membrane 3 is not subjected to stress, so the oxygen-permeable membrane does not exist Tendency to detach from the cathode and rupture, helping to extend the life of the sensor.

A specific method of using a sampling type fast primary battery oxygen sensor is as follows: First, as shown in Figure 6, the air suction port 10 and the pressure balance port 11 are introduced into the air pump 16 through two sections of air pipes;

Connect the air inlet 9 to the part of the gas to be measured through the adjustable throttle valve through the air pipe, and adjust the gas flow rate within 50-400 ml per minute by adjusting the throttle valve;

The positive and negative signals of the electrode lead wire 26 are connected to the conditioning amplification acquisition circuit, and the oxygen concentration of the site to be measured can be quickly detected through the acquisition signal.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (3)

1. The utility model provides a quick galvanic cell oxygen sensor of sampling formula which characterized in that: the main structure comprises an upper cover plate shell (1) and a main shell (2); the upper cover plate shell (1) is provided with an air inlet (9) and an air pumping hole (10) above, the air inlet (9) is thinner than the air pumping hole (10), a cylinder (19) is arranged in the upper cover plate shell (1), the air inlet corresponds to the center of the cylinder (19), and air enters an induction air chamber (13) of the sensor through the channel; the upper part of the main shell (2) comprises a convex spacer (20), a plurality of air outlet micropores (21) and oxygen permeable membranes (3), a reaction air chamber (22) of the sensor is arranged below the oxygen permeable membranes (3), the interior of the main shell comprises microporous cathodes (4) and anode bars (7) which are arranged below the oxygen permeable membranes (3) and are respectively soaked in electrolyte, and the main shell also comprises a sponge block (8) capable of adsorbing the electrolyte and a soft sealing membrane (6), and the soft sealing membrane (6) isolates the reaction air chamber (22) and a pressure balance air chamber (14); during assembly, the upper cover plate shell (1) covers the main shell body (2), the edge (25) of the upper shell is completely attached to the edge (24) of the main shell, the cylinder (19) inside the upper cover plate shell (1) is directly attached to the position of the convex spacer (20) of the main shell body (2), the oxygen permeable membrane (3) is placed below the convex spacer (20), the air inlet (9) just corresponds to the oxygen permeable membrane (3), the upper cover plate shell (1) and the outer edge of the main shell body are sealed and bonded by glue, external air is prevented from entering, two cavities are formed inside, and the sensing air chamber (13) and the air suction chamber (23) are formed; when the device works, external gas enters the sensor from the gas inlet (9), oxygen in the gas enters the reaction gas chamber (22) through the oxygen permeable membrane (3) to perform chemical reaction, and residual impurity gas flows out through a plurality of gas outlet micropores (21) of the main shell (2) and is pumped away through the pumping hole (10); the space between the upper cover plate shell (1) and the main shell (2) forms an induction air chamber (13) of the primary battery; the pressure balance air chamber (14) isolated through a soft sealing film (6) is arranged in the main shell (2), a pressure balance port (11) is arranged on the side edge of the balance air chamber (14), when the sampling sensor works, the air suction port (10) and the pressure balance port (11) are respectively led out through air pipe connection, two air ports are connected through a three-way pipe, the other port of the three-way pipe is extended out through the three-way pipe after being connected with a section of rubber pipe, one end of the three-way pipe is connected with an air suction pump (16) for air suction treatment, and the other end of the three-way pipe is connected with a noise reduction pump (15) for eliminating noise generated in the air suction process.

2. The sensor of claim 1, wherein: an adsorptive sponge block (8) is arranged in the reaction air chamber (22) and is soaked in KOH solution, and the microporous cathode (4) and the anode bar (7) are contacted with the sponge block (8), so that the cathode and the anode can still be contacted with electrolyte to carry out chemical reaction after the electrolyte in the sensor is used and consumed.

3. The sensor of claim 1, wherein: the material of the microporous cathode (4) is platinum metal; the anode bar (7) is made of lead; the oxygen permeable membrane (3) is made of polytetrafluoroethylene; the electrolyte is KOH electrolyte (5).

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