CN215066326U - Electrochemical sensor with long service life - Google Patents

Abstract

The utility model relates to a gas concentration detection technical field has solved among the prior art electrochemical sensor its electrolyte analyte gas consumption's when need not the measurement problem. The utility model provides a long life's electrochemical sensor, includes confined cavity, is equipped with the sensor body in the cavity, and the intercommunication has protective gas intake pipe, measuring gas intake pipe and outlet duct on the cavity, all is equipped with the solenoid valve in protective gas intake pipe and the measuring gas intake pipe, is equipped with the aspiration pump on the outlet duct, is equipped with the gaseous absorbing device of analyte in the protective gas intake pipe. In a non-measuring state, when the environmental gas passes through the analyte gas absorption device, the analyte gas is absorbed, and only the environmental gas which does not contain the analyte gas enters the cavity, so that the electrolyte of the sensor body is prevented from being consumed by the analyte gas in the environmental gas in the non-measuring state. The electrolyte consumption speed of the sensor body is slowed down, and the service life of the sensor body is prolonged.

Description

Electrochemical sensor with long service life

Technical Field

The utility model relates to a gas concentration detects technical field, especially relates to a long service life's electrochemical sensor.

Background

Electrochemical sensors for measuring gas concentrations are usually composed of a gas permeable membrane, electrodes and an electrolyte, the gas permeable membrane being used to cover the sensing (catalytic) electrodes, to provide mechanical protection for the sensor, to filter out unwanted particles; the electrode material should be a catalytic material capable of performing a semi-electrolytic reaction for a long period of time; the electrolyte is capable of electrochemically reacting with the analyte gas and producing an electrical signal at the electrode; sometimes a scrubbing filter is installed in front of the sensor to filter out unwanted gases. The electrolyte in an electrochemical sensor is limited and continues to electrochemically react with the analyte gas and be consumed during use, eventually leading to failure of the electrochemical sensor. In fact, in some cases, the concentration of a certain gas does not need to be measured continuously, but is measured at regular intervals, and the existing electrochemical sensor is of a diffusion type and is also in an analyte gas atmosphere in the time without measurement, so that the electrolyte is consumed wastefully, and the service life of the electrochemical sensor is shortened.

For example, an ammonia gas electrochemical sensor used in a chicken house in a chicken farm only needs to measure ammonia gas concentration for several times every day, but the electrochemical sensor is always in a high-concentration ammonia gas atmosphere, electrolyte is continuously consumed, the service life of one ammonia gas sensor is only 50 days, and the ammonia gas electrochemical sensor needs to be frequently replaced and is high in use cost and troublesome.

SUMMERY OF THE UTILITY MODEL

The utility model provides a long service life's electrochemical sensor has solved among the prior art electrochemical sensor its electrolyte analyte gas consumption's when need not the measurement problem.

The utility model provides a long life's electrochemical sensor, includes confined cavity, is equipped with the sensor body in the cavity, and the intercommunication has protective gas intake pipe, measuring gas intake pipe and outlet duct on the cavity, all is equipped with the solenoid valve in protective gas intake pipe and the measuring gas intake pipe, is equipped with the aspiration pump on the outlet duct, is equipped with the gaseous absorbing device of analyte in the protective gas intake pipe. When the utility model is used, the protection gas inlet pipe is closed through the electromagnetic valve, the measurement gas inlet pipe is opened, the air pump pumps air to generate negative pressure in the cavity, and the environmental gas enters the cavity through the measurement gas inlet pipe and is measured by the sensor body; under the non-measuring state, will measure the gas inlet pipe through the solenoid valve and seal, the protective gas intake pipe is opened, and the aspiration pump bleeds, produces the negative pressure in the cavity, and when ambient gas passed through analyte gas absorbing device, the gaseous interior absorption of analyte wherein, the ambient gas who only does not contain analyte gas that gets into the cavity has avoided the electrolyte of sensor body to be consumed by the analyte gas in the ambient gas under the non-measuring state. The electrolyte consumption speed of the sensor body is slowed down, and the service life of the sensor body is prolonged.

Furthermore, the sensor body is connected with a control circuit, and the electromagnetic valve and the air pump are connected with the control circuit.

Furthermore, the analyte gas absorption device comprises a shell, wherein at least one of calcium phosphate solution, formalin, hydrogen peroxide solution, potassium permanganate solution and copper sulfate solution acetic acid solution is contained in the shell, the shell is communicated with an absorption gas inlet pipe and an absorption gas outlet pipe, a pipe orifice of the absorption gas inlet pipe is positioned below the liquid level, a pipe orifice of the absorption gas outlet pipe is positioned above the liquid level, and one ends of the absorption gas inlet pipe and the absorption gas outlet pipe, which extend out of the shell, are connected with the protective gas inlet pipe. When the sensor body is an ammonia gas concentration sensor, the analyte gas is ammonia gas, the analyte gas absorption device is used for absorbing the ammonia gas, and the calcium phosphate solution, the formalin, the hydrogen peroxide solution, the potassium permanganate solution and the copper sulfate solution acetic acid solution can absorb the ammonia gas, preferably the potassium permanganate solution.

Furthermore, a drying device is arranged on the protective gas inlet pipe, two electromagnetic valves are arranged on the protective gas inlet pipe, and the analyte gas absorption device and the drying device are located between the two electromagnetic valves. And the drying device is positioned between the analyte gas absorption device and the cavity and used for absorbing moisture, so that the influence of overlarge humidity on the measurement of the sensor body is avoided.

Furthermore, the analyte gas absorption device comprises a shell, wherein activated carbon is arranged in the shell, one end of the shell is communicated with an absorption gas inlet pipe, the other end of the shell is communicated with an absorption gas outlet pipe, and the ends, extending out of the shell, of the absorption gas inlet pipe and the absorption gas outlet pipe are both connected with the protective gas inlet pipe. When the analyte gas is hydrogen sulfide gas, the sensor body is a hydrogen sulfide gas sensor, the analyte gas absorption device is used for absorbing the hydrogen sulfide gas, and the active carbon can absorb the hydrogen sulfide gas.

Furthermore, an electromagnetic valve is arranged on the air outlet pipe and connected with the control circuit. In a measuring state, the protective gas inlet pipe is closed through the electromagnetic valve, the measuring gas inlet pipe is opened, the air extracting pump extracts air to generate negative pressure in the cavity, environmental gas enters the cavity through the measuring gas inlet pipe, when the volume of the gas extracted by the air extracting pump is larger than or equal to the volume of the cavity, the electromagnetic valves on the measuring gas inlet pipe and the air outlet pipe and the electromagnetic valve on the protective gas inlet pipe, which is close to the cavity, are closed, so that the cavity is closed, and the sensor body performs measurement; under the non-measuring state, will measure the gas inlet pipe through the solenoid valve and seal, the protective gas intake pipe is opened, the aspiration pump bleeds, produce the negative pressure in the cavity, when ambient gas passes through analyte gas absorbing device, analyte gas is interior to absorb wherein, the ambient gas that only does not contain analyte gas that gets into the cavity, when the gas volume that the aspiration pump bleeds is greater than or equal to the cavity volume, the solenoid valve that is close to the cavity on measuring gas intake pipe and the solenoid valve that is close to the cavity in the protective gas intake pipe is closed, make the cavity seal, the sensor body is in the atmosphere that does not contain analyte gas, the consumption of electrolyte has been avoided.

The gas-liquid separation device further comprises a shell, the cavity, the air pump and the electromagnetic valve are located in the shell, and the protective gas inlet pipe, the measuring gas inlet pipe and the gas outlet pipe penetrate through the shell.

The gas-liquid separation device is characterized by further comprising a shell, wherein the cavity, the air extracting pump and the electromagnetic valve are located in the shell, the protective gas inlet pipe and the measuring gas inlet pipe are communicated with the cavity through first gas inlet pipes, and the protective gas inlet pipe, the measuring gas inlet pipe and the first gas inlet pipes form a three-way structure.

And the protective gas inlet pipe and the measuring gas inlet pipe are communicated with the second gas inlet pipe, the protective gas inlet pipe and the measuring gas inlet pipe form a three-way structure, and the second gas inlet pipe and the gas outlet pipe penetrate through the shell.

Furthermore, the shell comprises a shell body and a plugging plug, the shell body and the plugging plug are in sealing connection through conical threads, and the absorption air inlet pipe and the absorption air outlet pipe penetrate through the plugging plug. The solution used for absorbing the analyte gas in the analyte gas absorption device can be consumed, when the concentration of the solution is reduced to a certain degree and needs to be replaced, the shell body is rotated to enable the solution to be separated from the plugging plug, and the solution is replaced and then the solution absorption device is assembled, so that the operation is convenient. The taper thread connection can ensure that the air tightness between the shell body and the plugging plug is good, and a thread sealing agent can be used for sealing between the shell body and the plugging plug when necessary.

According to the technical scheme, the utility model has the advantages of it is following:

when the utility model is used, the protection gas inlet pipe is closed through the electromagnetic valve, the measurement gas inlet pipe is opened, the air pump pumps air to generate negative pressure in the cavity, and the environmental gas enters the cavity through the measurement gas inlet pipe and is measured by the sensor body; under the non-measuring state, will measure the gas inlet pipe through the solenoid valve and seal, the protective gas intake pipe is opened, and the aspiration pump bleeds, produces the negative pressure in the cavity, and when ambient gas passed through analyte gas absorbing device, the gaseous interior absorption of analyte wherein, the ambient gas who only does not contain analyte gas that gets into the cavity has avoided the electrolyte of sensor body to be consumed by the analyte gas in the ambient gas under the non-measuring state. The electrolyte consumption speed of the sensor body is slowed down, and the service life of the sensor body is prolonged.

Drawings

In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive work.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is a schematic view of the housing structure of the present invention;

1. the device comprises a cavity, 2, a sensor body, 3, a protective gas inlet pipe, 4, a measuring gas inlet pipe, 5, an outlet pipe, 6, an electromagnetic valve, 7, an air pump, 8, an analyte gas absorption device, 9, an absorption inlet pipe, 10, an absorption outlet pipe, 11, a drying device, 12, a shell, 13, a first inlet pipe, 14, a second inlet pipe, 15, a shell body, 16 and a sealing plug.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the embodiments described below are only some embodiments, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the present patent without making any creative effort, shall fall within the scope of protection of the present patent.

Example 1

As shown in fig. 1 and 3, an electrochemical sensor with long service life comprises a sealed cavity 1, a sensor body 2 is arranged in the cavity 1, a protective gas inlet pipe 3, a measurement gas inlet pipe 4 and an outlet pipe 5 are communicated with the cavity 1, electromagnetic valves 6 are arranged on the protective gas inlet pipe 3 and the measurement gas inlet pipe 4, an air suction pump 7 is arranged on the outlet pipe 5, and an analyte gas absorption device 8 is arranged on the protective gas inlet pipe 3. When the utility model is used, the measuring state and the non-measuring state are divided, under the measuring state, the protective gas inlet pipe 3 is sealed through the electromagnetic valve 6, the measuring gas inlet pipe 4 is opened, the air is pumped by the air pump 7, negative pressure is generated in the cavity 1, and the environmental gas enters the cavity 1 through the measuring gas inlet pipe 4 and is measured by the sensor body 2; under the non-measuring state, the measuring gas inlet pipe 4 is closed through the electromagnetic valve 6, the protective gas inlet pipe 3 is opened, the air extracting pump 7 extracts air, negative pressure is generated in the cavity 1, and when environmental gas passes through the analyte gas absorption device 8, the analyte gas in the environmental gas is absorbed, and only the environmental gas which does not contain the analyte gas enters the cavity 1, so that the electrolyte of the sensor body 2 is prevented from being consumed by the analyte gas in the environmental gas under the non-measuring state. The electrolyte consumption speed of the sensor body 2 is slowed down, and the service life of the sensor body 2 is prolonged. The sensor body 2 is connected with a control circuit, and the electromagnetic valve 6 and the air pump 7 are connected with the control circuit. The analyte gas absorption device 8 comprises a shell, wherein at least one of calcium phosphate solution, formalin, hydrogen peroxide solution, potassium permanganate solution and copper sulfate solution acetic acid solution is contained in the shell, the shell is communicated with an absorption gas inlet pipe 9 and an absorption gas outlet pipe 10, a pipe orifice of the absorption gas inlet pipe 9 is positioned below the liquid level, a pipe orifice of the absorption gas outlet pipe 10 is positioned above the liquid level, and one ends of the absorption gas inlet pipe 9 and the absorption gas outlet pipe 10, which extend out of the shell, are connected with the protective gas inlet pipe 3. When the sensor body 2 is an ammonia gas concentration sensor, the analyte gas is ammonia gas, the analyte gas absorption device 8 is used for absorbing the ammonia gas, and the calcium phosphate solution, the formalin, the hydrogen peroxide solution, the potassium permanganate solution and the copper sulfate solution acetic acid solution can absorb the ammonia gas, preferably the potassium permanganate solution. Be equipped with drying device 11 on the protective gas intake pipe 3, be equipped with two altogether on the protective gas intake pipe 3 solenoid valve 6, analyte gas absorption device 8 and drying device 11 are located between two solenoid valves 6. And the drying device 11 is located between the analyte gas absorption device 8 and the cavity 1, and is used for absorbing moisture, so that the influence of overlarge humidity on the measurement of the sensor body 2 is avoided.

And the air outlet pipe 5 is provided with an electromagnetic valve 6, and the electromagnetic valve 6 is connected with the control circuit. In a measuring state, the protective gas inlet pipe 3 is closed through the electromagnetic valve 6, the measuring gas inlet pipe 4 is opened, the air extracting pump 7 extracts air to generate negative pressure in the cavity 1, environmental gas enters the cavity 1 through the measuring gas inlet pipe 4, when the volume of the gas extracted by the air extracting pump 7 is larger than or equal to the volume of the cavity 1, the electromagnetic valves 6 on the measuring gas inlet pipe 4 and the air outlet pipe 5 and the electromagnetic valve 6 on the protective gas inlet pipe 3, which is close to the cavity 1, are closed, so that the cavity 1 is closed, and the sensor body 2 performs measurement; under the non-measuring state, will measure gas intake pipe 4 and seal through solenoid valve 6, protective gas intake pipe 3 opens, aspiration pump 7 bleeds, produce the negative pressure in cavity 1, when ambient gas passes through analyte gas absorbing device 8, analyte gas is interior to absorb wherein, the only ambient gas that does not contain analyte gas that gets into cavity 1, when the gas volume that air pump 7 bleeds is greater than or equal to cavity 1 volume, solenoid valve 6 on measuring gas intake pipe 4 and the outlet duct 5 and the solenoid valve 6 that is close to cavity 1 in the protective gas intake pipe 3 close, make cavity 1 seal, sensor body 2 is in the atmosphere that does not contain analyte gas, the consumption of electrolyte has been avoided.

The device is characterized by further comprising a shell 12, wherein the cavity 1, the air extracting pump 7 and the electromagnetic valve 6 are located in the shell 12, and the protective gas inlet pipe 3, the measuring gas inlet pipe 4 and the air outlet pipe 5 penetrate through the shell 12. The shell comprises a shell body 15 and a blocking plug 16, the shell body 15 and the blocking plug 16 are in sealing connection by adopting taper threads, and the absorption air inlet pipe 9 and the absorption air outlet pipe 10 penetrate through the blocking plug 16. The solution used for absorbing the analyte gas in the analyte gas absorption device 8 is also consumed, when the concentration of the solution is reduced to a certain degree and needs to be replaced, the housing body 15 is rotated to enable the solution and the plugging plug 16 to be separated, and the solution is replaced and then the solution is assembled, so that the operation is convenient. The taper screw connection ensures good airtightness between the housing body 15 and the plug 16, and if necessary, a screw sealant may be used to seal between the housing body 15 and the plug 16.

Example 2

As shown in fig. 2, the present embodiment is different from embodiment 1 in that the analyte gas absorption device 8 includes a housing, activated carbon is disposed in the housing, one end of the housing is communicated with an absorption gas inlet tube 9, the other end of the housing is communicated with an absorption gas outlet tube 10, and both ends of the absorption gas inlet tube 9 and the absorption gas outlet tube 10 extending out of the housing are connected to the shielding gas inlet tube 3. When the analyte gas is a hydrogen sulfide gas, the sensor body 2 is a hydrogen sulfide gas sensor, the analyte gas absorption device 8 is used for absorbing the hydrogen sulfide gas, and the activated carbon can absorb the hydrogen sulfide gas.

Still include shell 12, cavity 1, aspiration pump 7, solenoid valve 6 are located shell 12, protective gas intake pipe 3, measuring gas intake pipe 4 all through first intake pipe 13 with cavity 1 intercommunication, protective gas intake pipe 3, measuring gas intake pipe 4, first intake pipe 13 form the tee bend structure. Still include second intake pipe 14, protective gas intake pipe 3, measuring gas intake pipe 4 all communicate with second intake pipe 14, and the three forms the tee bend structure, second intake pipe 14 with outlet duct 5 passes shell 12.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a long service life's electrochemical sensor, its characterized in that, including confined cavity (1), be equipped with sensor body (2) in cavity (1), the intercommunication has protective gas intake pipe (3), measuring gas intake pipe (4) and outlet duct (5) on cavity (1), all is equipped with solenoid valve (6) on protective gas intake pipe (3) and measuring gas intake pipe (4), is equipped with aspiration pump (7) on outlet duct (5), is equipped with analyte gas absorption device (8) on protective gas intake pipe (3).

2. The long-life electrochemical sensor according to claim 1, characterized in that the sensor body (2) is connected with a control circuit, and the electromagnetic valve (6) and the air pump (7) are connected with the control circuit.

3. The long-life electrochemical sensor according to claim 2, wherein the analyte gas absorption device (8) comprises a housing, at least one of calcium phosphate solution, formalin, hydrogen peroxide solution, potassium permanganate solution and copper sulfate solution acetic acid solution is contained in the housing, an absorption gas inlet pipe (9) and an absorption gas outlet pipe (10) are communicated with the housing, a pipe orifice of the absorption gas inlet pipe (9) is located below the liquid level, a pipe orifice of the absorption gas outlet pipe (10) is located above the liquid level, and one ends of the absorption gas inlet pipe (9) and the absorption gas outlet pipe (10) extending out of the housing are both connected with the protective gas inlet pipe (3).

4. A long-life electrochemical sensor according to claim 3, characterized in that the protective gas inlet tube (3) is provided with a drying device (11), the protective gas inlet tube (3) is provided with a total of two of the solenoid valves (6), and the analyte gas absorption device (8) and the drying device (11) are located between the two solenoid valves (6).

5. The long-life electrochemical sensor according to claim 2, wherein the analyte gas absorption device (8) comprises a housing, activated carbon is disposed in the housing, one end of the housing is communicated with an absorption gas inlet pipe (9), the other end of the housing is communicated with an absorption gas outlet pipe (10), and the ends of the absorption gas inlet pipe (9) and the absorption gas outlet pipe (10) extending out of the housing are both connected with the protective gas inlet pipe (3).

6. The long-life electrochemical sensor according to any one of claims 2 to 5, wherein the air outlet pipe (5) is provided with a solenoid valve (6), and the solenoid valve (6) is connected with the control circuit.

7. The long-service-life electrochemical sensor according to claim 6, further comprising a housing (12), wherein the cavity (1), the air pump (7) and the electromagnetic valve (6) are located in the housing (12), and the protective gas inlet pipe (3), the measuring gas inlet pipe (4) and the air outlet pipe (5) penetrate through the housing.

8. The long-service-life electrochemical sensor according to claim 6, further comprising a housing (12), wherein the cavity (1), the air pump (7) and the electromagnetic valve (6) are located in the housing, the protective gas inlet pipe (3) and the measurement gas inlet pipe (4) are communicated with the cavity (1) through a first gas inlet pipe (13), and the protective gas inlet pipe (3), the measurement gas inlet pipe (4) and the first gas inlet pipe (13) form a three-way structure.

9. The long-service-life electrochemical sensor according to claim 8, further comprising a second gas inlet pipe (14), wherein the protective gas inlet pipe (3) and the measurement gas inlet pipe (4) are both communicated with the second gas inlet pipe (14), the protective gas inlet pipe, the measurement gas inlet pipe and the measurement gas inlet pipe form a three-way structure, and the second gas inlet pipe (14) and the gas outlet pipe (5) penetrate through the housing (12).

10. The long-life electrochemical sensor according to claim 3, wherein the housing comprises a housing body (15) and a plug (16), the housing body (15) and the plug (16) are hermetically connected by a taper thread, and the absorption gas inlet pipe (9) and the absorption gas outlet pipe (10) penetrate through the plug (16).

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