CN113295755A - Sampling type rapid primary battery oxygen sensor - Google Patents
Sampling type rapid primary battery oxygen sensor Download PDFInfo
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- CN113295755A CN113295755A CN202110542192.9A CN202110542192A CN113295755A CN 113295755 A CN113295755 A CN 113295755A CN 202110542192 A CN202110542192 A CN 202110542192A CN 113295755 A CN113295755 A CN 113295755A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract
The invention discloses a sampling type rapid oxygen sensor for a primary battery, which comprises an external main shell and an upper cover plate shell, wherein an air inlet and an air extraction opening are formed above the upper cover plate shell, a space between the upper cover plate shell and the main shell forms an induction air chamber of the primary battery, after external air enters the induction air chamber through the air inlet, oxygen in the air 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 extracted away through the air extraction opening via an air extraction 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, the oxygen permeable membrane is not stressed, and is not easy to separate and break, and the service life of the sensor is prolonged.
Description
Technical Field
The invention relates to the field of medical oxygen sensors, in particular to a sampling type rapid primary battery oxygen sensor.
Background
The analysis and measurement of oxygen is widely applied to many fields such as laboratories, biology, medicine, chemical industry, energy and the like. The oxygen sensor is the most studied and most mature sensor in all gas sensors.
The oxygen sensor can be classified into an electrochemical oxygen sensor, an optical fiber oxygen sensor, a thermomagnetic oxygen sensor, a semiconductor resistance oxygen sensor, and the like according to different working principles. The electrochemical oxygen sensor generally utilizes electrochemical reaction to realize oxygen measurement, has the advantages of high sensitivity, wide measurement range, short response time and the like, is widely applied to the fields of chemical industry, medical treatment, biology and military, is the most mature oxygen sensor with the most wide application in the prior art.
The existing electrochemical oxygen sensor has the defects that dead space is large due to the problem of a ventilation structure, so that the reaction speed of the sensor is slow due to the influence; the temperature variation difference in the measurement process can lead to the pressure inside to become great, and the increase of pressure can lead to electrolyte to block up and even ooze the inlet port, causes the sensor can't admit air and fail.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a sampling type rapid primary cell oxygen sensor.
The invention is realized by the following technical scheme:
a sampling type rapid primary cell oxygen sensor comprises a main body structure, a sampling type rapid primary cell oxygen sensor and a sampling type rapid primary cell oxygen sensor, wherein the main body structure comprises an upper cover plate shell 1 and a main shell 2; upper cover shell part: the upper portion of the upper cover plate shell 1 comprises an air inlet 9 and an air pumping hole 10, 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 9 corresponds to the center of the cylinder, and air enters the sensing air chamber 13 of the sensor through the channel. The cylindrical body 19 includes a plurality of minute holes at its peripheral edge. A main housing portion: main casing top includes protruding spacer 20, and a plurality of oxygen permeation membrane 3 of micropore 21 and polytetrafluoroethylene material of giving vent to anger are the reaction air chamber 12 of sensor under the oxygen permeation membrane 3, and inside includes micropore negative pole 4 and the positive pole stick 7 of oxygen permeation membrane 3 below, soaks respectively in electrolyte, contains sponge piece 8 and soft seal membrane 6 of adsorbable electrolyte equally, and reaction air chamber 22 and pressure balance air chamber 14 are kept apart to soft seal membrane 6.
The utility model provides a quick galvanic cell oxygen sensor of sampling formula is when the equipment, with upper cover plate shell 1 lid on main casing body 2, upper cover edge 25 laminates completely with main casing edge 24, the cylinder 19 of upper cover plate shell 1 inside can directly laminate in main casing body 2's protruding dottle pin 20 department, oxygen permeation membrane 3 is placed to protruding dottle pin 20's below, air inlet 9 just is corresponding oxygen permeation membrane 3, use glue with upper cover plate shell 1 and with the sealed bonding of main casing body outside edge, avoid outside air to get into. Two cavities, a minute reaction gas chamber 22 and a pumping chamber 23, are formed inside. When the oxygen-permeable sensor works, external air enters the sensor from the air inlet 9, oxygen in the air enters the reaction air chamber 22 through the oxygen-permeable membrane 3 to perform chemical reaction, and residual impurity gas flows out through a plurality of micropores on the edge of the cylinder in the upper cover and is pumped away through the air pumping hole 10.
Further, the space between the upper cover case 1 and the main case 2 constitutes an induction air chamber 13 of the primary battery.
Further, the pressure balance air chamber 14 that separates through a soft seal membrane 6 in main casing 2 inside, the side of balance air chamber 14 sets up a pressure balance mouth 11, when the sampling sensor during operation, draw air outlet 10 and pressure balance mouth 11 with soft rubber tube connection respectively and draw forth, link to each other two gas ports through the three-way pipe, another port of three-way pipe extends out through the three-way pipe after connecting one section rubber tube, an end connects aspiration pump 16 and carries out the processing of bleeding, another end connects the noise that noise elimination amortization pump 15 produced in the air bleed process.
Further, a sponge block 8 having adsorption property is placed inside the reaction gas chamber 22, and is soaked in KOH solution, so that the microporous cathode 4 and the anode bar 7 can contact the sponge block 8. The chemical reaction between the cathode and the anode can be ensured to be still contacted with the electrolyte to generate after the sensor is used and consumed for a long time.
Further, 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.
The invention has the advantages that:
the utility model provides a structural design of quick galvanic cell oxygen sensor of sampling formula makes sensor internal seal nature better, and gas circulates smoothly after getting into the sensor through the air inlet, and the residual time of reaction back residual gas is shorter. The dead space of the internal tiny induction air chamber is small, so that the response speed of the sensor is short, and the response is rapid. The special pressure balance port is arranged, after gas enters the sensing air chamber from the gas inlet, the pressure of the sensing air chamber and the pressure of the balance air chamber are close by external pumping, the pressure on two sides of the oxygen permeable membrane is kept relatively equal, and the membrane of the device is not easy to move or break. A sponge block capable of adsorbing electrolyte is arranged in a reaction air chamber of the sensor, so that after the sensor is used for a long time, the microporous cathode and the anode bar can be continuously contacted with KOH solution, and the service life of the sensor is prolonged.
Drawings
FIG. 1 is a block diagram of the uncovered upper deck shell of the present invention;
FIG. 2 is a gas circuit diagram of the gas flow circuit in operation of the present invention;
FIG. 3 is an inside view of the upper deck shell of the present invention;
FIG. 4 is a top view of the main housing of the present invention;
FIG. 5 is a front view of the sensor of the present invention;
fig. 6 is a structural view of the peripheral pressure equalizing device in operation of the present invention.
In the figure, 1, a cover plate shell is arranged; 2 a main housing; 3 an oxygen permeable membrane; 4 a microporous cathode; 5 KOH electrolyte; 6 soft sealing film; 7 an anode rod; 8, sponge blocks; 9 an air inlet; 10 air extraction openings; 11 a pressure balancing port; 12 gas circulation gas circuit; 13 sensing the air chamber; 14 a pressure balance chamber; 15 a sound-deadening pump; 16 a suction pump; 17 a tee pipe; 18 air pipe; 19 a cylinder; 20 raised spacers; 21 air outlet micropores; 22 a reaction gas chamber; 23 air pumping cavity; 24 a main shell edge; 25, upper shell edge; 26 electrode leads.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and exemplary embodiments.
As shown in fig. 1-5, the main structure of a sampling type fast primary cell oxygen sensor comprises an upper cover plate shell 1 and a main shell 2. There are air inlet 9 and extraction opening 10 in the top of upper cover shell 1, air inlet 9 is thin on the side of being compared with extraction opening 10, upper cover shell 1 inside contains inner shell cylinder 19, the air inlet just corresponds to the center department of cylinder 19, cover upper cover shell 1 on main casing body 2, upper shell edge 25 and main shell edge 24 are laminated completely, the cylinder 19 of upper cover shell and the protruding spacer 20 of main casing body 2 top are coincide completely and can be inlayed, upper cover shell 1 and the edge of main casing body 2 use the glue bonding, keep a sealing state, prevent that outside air from getting into inside the sensor. The space between the upper cover shell 1 and the main shell 2 constitutes the induction air chamber 13 of the galvanic cell. The flow path of the gas is as shown in the gas flow path 12 shown in the following fig. 2, the gas enters the sensing gas chamber 13 through the gas inlet 9 via the inner shell cylinder 19, the oxygen permeable membrane 3 made of polytetrafluoroethylene with the thickness of 10-20um is arranged below the inner shell cylinder 19, and the oxygen in the gas enters the reaction gas chamber 22 of the sensor for chemical reaction via the oxygen permeable membrane 3. Remaining foreign gas is pumped by aspiration pump 16 and is handled, flows out from main casing body 2's the micropore 21 of giving vent to anger and is taken out by extraction opening 10 through air exhaust chamber 23, and special structural design makes gas entering sensor circulation smooth and easy, and the foreign gas after the reaction stops the time shorter, and inside small response air chamber 13 dead space is less, is of value to the response speed of sensor and accelerates, has promoted the performance of sensor.
The reaction chamber 22 contains inside a microporous cathode 4 under the oxygen permeable membraneThe material is platinum metal, the anode bar 7 is arranged on the inner wall of the side edge of the sensor, the material is lead material, and the lead material is led out of the sensor through an electrode lead 26. Micropore negative pole 4 and anode bar 7 soak in KOH electrolyte 5, and reaction chamber 22 is inside to contain a sponge piece 8 that has adsorbability, and sponge piece 8 top and side contact respectively in micropore negative pole 4 and anode bar 7, guarantee that the sensor is in long-time use, and behind the consumption loss of electrolyte, micropore negative pole 4 and anode bar 7 energy source absorb electrolyte constantly and take place chemical reaction, have increased the life of sensor. The oxygen entering the reaction chamber 22 performs the following reaction: the oxygen reaches the microporous cathode 4 and immediately undergoes a reduction reaction, and the reaction equation is as follows: o is2+2H2O+4e-→4OH-. The generated hydroxyl ions reach the anode bar 7 through the KOH electrolyte 5 to undergo oxidation reaction, and the equation of the reaction is 2Pb +4OH-→2PbO+2H2O+4e-。
A reaction gas chamber 22 of a sampling type rapid primary cell 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 edge of the balance gas chamber 14. When the sampling sensor works, as shown in fig. 6, the structure diagram of the peripheral pressure balancing device during working is that an air pipe 18 is respectively used for leading out an air pumping port 10 and a pressure balancing port 11, two pipe orifices are connected by two ends of a three-way pipe 17, the other end of the three-way pipe 17 is connected with a section of rubber soft leather pipe and then is connected by the same three-way pipe, one end of the three-way pipe is connected with the rubber soft leather pipe, the other end of the three-way pipe is connected with an air pumping pump 16 for air pumping treatment, and the other end of the three-way pipe is connected with a silencing pump 15 for noise removal. During the air extraction process, the sensing air chamber 13 and the pressure balance air chamber 14 are close to a vacuum environment, and the two air chambers have nearly equal negative pressure. Therefore, the pressure difference between the sensing gas chamber 13 and the balance gas chamber 14 is small, so that the electrolyte in the reaction gas chamber 22 cannot overflow through the porous electrode, and meanwhile, the oxygen permeable membrane 3 is not stressed, so that the oxygen permeable membrane has no tendency of separating from the cathode and cracking, and the service life of the sensor is prolonged.
A sampling type rapid primary cell oxygen sensor concretely comprises the following steps: first, as shown in fig. 6, the suction port 10 and the pressure balance port 11 are introduced into the suction pump 16 through two air pipes;
connecting an air inlet 9 to a gas part to be measured through an air pipe by an adjustable throttle valve, and adjusting the flow rate of the gas within 50-400 ml per minute by the adjustable throttle valve;
the positive and negative signals of the electrode lead 26 are connected into the conditioning amplification acquisition circuit, and the oxygen concentration of the part to be detected can be quickly detected through the acquired signals.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
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 part of the upper cover plate shell (1) comprises an air inlet (9) and an air pumping hole (10), 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; main casing body (2) top includes protruding spacer (20), and a plurality of micropore (21) and oxygen permeable membrane (3) of giving vent to anger are the response air chamber (13) of sensor under oxygen permeable membrane (3), and inside includes micropore negative pole (4) and positive pole stick (7) of oxygen permeable membrane (3) below, soaks respectively in electrolyte, contains sponge piece (8) and soft seal membrane (6) of adsorbable electrolyte equally, and reaction air chamber (22) and pressure balance air chamber (14) are kept apart out in soft seal membrane (6).
2. The sensor of claim 1, wherein: 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) is opposite 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 reaction air chamber (22) and the air suction chamber (23) are formed; when the gas sensor 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 the plurality of gas outlet micropores (21) of the main shell (2) and is pumped away through the pumping hole (10).
3. The sensor of claim 1, wherein: 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.
4. 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.
5. 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).
6. The sensor of claim 1, wherein: the space between the upper cover plate shell (1) and the main shell (2) forms an induction air chamber (13) of the primary battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110542192.9A CN113295755B (en) | 2021-05-18 | 2021-05-18 | Sampling type rapid primary battery oxygen sensor |
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| CN202110542192.9A CN113295755B (en) | 2021-05-18 | 2021-05-18 | Sampling type rapid primary battery oxygen sensor |
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| CN113295755A true CN113295755A (en) | 2021-08-24 |
| CN113295755B CN113295755B (en) | 2022-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114965648A (en) * | 2022-05-23 | 2022-08-30 | 西北工业大学 | Oxygen sensor |
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