CN111596004A

CN111596004A - Gas sectional measurement method, device and system

Info

Publication number: CN111596004A
Application number: CN202010328556.9A
Authority: CN
Inventors: 蒲友强
Original assignee: Chengdu Chang Ai Electronic Science & Technology Co ltd
Current assignee: Chengdu Chang Ai Electronic Science & Technology Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-08-28

Abstract

The invention provides a gas sectional measurement method, a device and a system, comprising the following steps: s1: dividing the gas concentration into at least two measurement intervals; s2: judging that the concentration of the gas to be measured is in a specific measurement interval; s3: selecting a corresponding sensor to measure the gas concentration; s4: the sensor monitors the change of the gas concentration in the measuring process, and the sensor used for measuring is replaced in time. The problem of current gas measurement accuracy not enough is solved. According to the gas sectional measurement method, the gas sectional measurement device and the gas sectional measurement system, different working modes are defined by dividing the number of the sensors for measurement through the division of the measurement intervals, and different working modes are adopted corresponding to different measurement intervals by combining the trend of the gas concentration change, so that the precision of the gas concentration measurement result is improved.

Description

Gas sectional measurement method, device and system

Technical Field

The invention belongs to the technical field of gas concentration measurement, and particularly relates to a gas sectional measurement method, device and system.

Background

In the field of gas analysis, there is often a need for users to measure a wide range of gas concentrations, such as from ppm levels to% levels, however, almost all gas sensors currently fail to meet such a wide range of measurement accuracy requirements. For oxygen concentration measurements from 1ppm to 25%, fuel cells or zirconia-based sensors are commonly used, but none of these sensors can meet the accuracy requirements in the range of 1ppm to 25%, and in some ranges only provide observations showing trends, and measurement accuracy is not guaranteed.

Disclosure of Invention

The invention aims to provide a gas sectional measurement method, a gas sectional measurement device and a gas sectional measurement system, which solve the problem of insufficient measurement precision of the existing gas.

The technical scheme adopted by the invention is as follows:

a method of gas staging measurement comprising the steps of:

s1: dividing the gas concentration into at least two measurement intervals;

s2: judging the change trend of the concentration of the gas to be measured and the position of the gas to be measured in a specific measurement interval;

s3: selecting a corresponding sensor to measure the gas concentration;

s4: the sensor monitors the change of the gas concentration in the measuring process, and the sensor used for measuring is replaced in time.

According to the gas sectional measurement method, the measurement interval and the gas concentration change trend are measured in real time, so that the sensors for measurement are switched in time, the gas concentration measurement precision is ensured, the sensors work alternately, and the service life of the sensors is effectively prolonged.

Preferably, each measurement interval corresponds to at least one sensor for measuring the gas concentration in the measurement interval.

Preferably, the measurement interval includes a high concentration interval, an intermediate concentration interval, and a low concentration interval;

the sensors comprise an elevation sensor for measuring a high concentration interval and a low-range sensor for measuring a low concentration interval, and the elevation sensor and the low-range sensor are jointly used for measuring an intermediate concentration interval.

Preferably, the method for selecting the corresponding sensor in step S3 is as follows:

s301: dividing the gas concentration variation trend into a descending trend and an ascending trend;

s302: judging the concentration variation trend of the gas to be measured and a measurement interval corresponding to the gas concentration, and selecting a corresponding sensor;

s303: and outputting the result of the measurement of the sensor.

Preferably, in step S302, when the concentration variation trend of the gas to be measured conforms to the descending trend, when the gas concentration is higher than the lower limit value of the intermediate concentration interval, the elevation sensor works alone; when the gas concentration is lower than the lower limit value of the middle concentration interval, the elevation sensor and the low-range sensor work together;

in step S303, the output measurement result is: when the concentration variation trend of the gas to be measured accords with the descending trend, when the gas concentration is higher than the lower limit value of the middle concentration interval, outputting a result as a measurement result of the elevation sensor; and when the gas concentration is lower than the lower limit value of the intermediate concentration interval, outputting a measurement result of the low-range sensor.

Preferably, in step S302, when the concentration variation trend of the gas to be measured conforms to the rising trend, when the gas concentration is lower than the upper limit value of the intermediate concentration interval, the elevation sensor and the low sensor work together; when the gas concentration is higher than the upper limit value of the middle concentration interval, the elevation sensor works independently;

in step S303, the output measurement result is: when the concentration variation trend of the gas to be measured accords with the rising trend, when the gas concentration is lower than the upper limit value of the middle concentration interval, outputting a result as the measurement result of the low-range sensor; and when the gas concentration is higher than the upper limit value of the middle concentration interval, outputting the measurement result of the elevation sensor.

A gas sectional measuring device comprises a sensor;

the gas sectional measuring device also comprises a seat body, a plurality of cavities positioned on the seat body and a packing device used for sealing the cavities, wherein each cavity is internally and correspondingly provided with a sensor, and the seat body is also provided with a gas circuit control structure.

The gas measuring device sets different working modes through the use of the sensor module, ensures the precision of gas concentration measurement, reduces the requirement on the number of measuring equipment and saves the economic cost; through the setting of the working mode, a plurality of sensors can work alternately, and the service life of a single sensor is prolonged.

Preferably, the gas circuit control structure comprises a valve body connected with the seat body, a shutoff valve detachably arranged on the valve body and a gas flow pipeline positioned in the valve body;

the gas flow pipeline comprises a gas inlet pipeline and a gas outlet pipeline which are communicated with each other, the gas inlet pipeline is communicated with the outside, the gas outlet pipeline is communicated with the cavity, and the gas inlet pipeline and the gas outlet pipeline are connected through a shutoff valve.

Preferably, the air inlet pipeline comprises an air inlet groove, a first passage and a second passage which are sequentially communicated, the air inlet groove is communicated with the outside, the first passage is provided with an air resistance structure, and the second passage is connected with the shutoff valve.

Preferably, the gas outlet pipeline comprises a third passage and a fourth passage which are communicated in sequence, the third passage is connected with the shutoff valve, and the fourth passage is communicated with the cavity and the third passage respectively.

Preferably, the gas flow pipeline further comprises an auxiliary pipeline, the auxiliary pipeline comprises a plugging groove and a fifth passage which are sequentially communicated, the plugging groove is communicated with the outside, a plugging block is detachably arranged on the plugging groove, and the fifth passage is communicated with the fourth passage.

Preferably, the packing device comprises a cover plate, a sealing structure and at least one knob, wherein the cover plate is fixed on the base body;

one end of the cavity is sealed through a sealing structure, and the other end of the cavity is sealed through a knob.

Preferably, the seat body is provided with a sealing cavity communicated with the cavity body, the sealing structure is arranged in the sealing cavity, and the cover plate shields the sealing cavity;

the sealing structure comprises a thread positioned on the sealing cavity and a pressing ring matched with the thread, and the pressing ring is connected with the sensor;

the knob is detachably connected with the cavity, and the knob corresponds to the cavity one by one.

Preferably, the sensor comprises a sensor body and a signal acquisition board arranged on the cavity, and the sensor body is provided with an annular metal layer;

still be equipped with the wiring mouth on the pedestal, be equipped with on the signal acquisition board with annular metal level assorted probe, probe one end is connected with the sensor body electricity through annular metal level, the probe other end is connected with the wiring mouth electricity.

A gas subsection measuring system comprises a gas subsection measuring device;

the gas subsection measuring system also comprises a signal transmission module and a control module, wherein the signal transmission module receives signals from the gas subsection measuring device and transmits the signals to the control module, and the control module controls the opening and closing of a shutoff valve in the gas subsection measuring device.

The control module selectively opens one or more of the shut-off valves and closes others of the shut-off valves by switching the operating mode. The sensor corresponding to the shut-off valve that is opened is in a measuring state, and the sensor corresponding to the shut-off valve that is closed is in a non-measuring state.

The invention has the beneficial effects that:

a gas subsection measuring method divides measuring intervals, selects sensors suitable for measuring in the intervals, defines different working modes according to the number and characteristics of the sensors for measuring, combines the trend of gas concentration change, and adopts different working modes corresponding to different measuring intervals, thereby improving the precision of gas concentration measuring results. Different working modes are adopted, the electrochemical gas sensor is effectively prevented from being used in a range exceeding the measurement range, the service life of the sensor is effectively prolonged, the replacement frequency is reduced, and the maintenance cost is reduced.

A gas subsection measuring device can not only ensure the use requirement of wide range, but also reduce the number of used devices, ensure the service life of the gas subsection measuring device, reduce the frequency of device replacement and reduce the cost of replacement and maintenance; and the knob easy to disassemble is arranged, so that the sensor is convenient to replace.

The gas subsection measuring system controls the working process of the gas subsection measuring device, realizes automatic operation and reduces the manpower input; meanwhile, the control module is switched to the working mode of the gas sectional measuring device, and different measuring modes are adopted for different measuring intervals, so that the gas concentration measuring precision is improved.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

FIG. 1 is a flow chart of a method of gas staging.

Fig. 2 is a schematic structural diagram of a gas segment measuring device.

FIG. 3 is a schematic view of a gas segment measuring device with the cover plate removed.

Fig. 4 is a schematic top view of a gas-section measuring apparatus.

FIG. 5 is a schematic diagram of a side view of a gas segment measuring device.

Fig. 6 is a partially enlarged schematic view of a structure at a.

Fig. 7 is a partially enlarged structural view at B.

Fig. 8 is a block diagram of a gas segment measurement system.

In the figure: 1-a seat body; 11-a cavity; 12-a wiring port; 13-sealing the cavity; 2-packing means; 21-cover plate; 22-a knob; 23-a sealing structure; 231-a pressure ring; 232-sealing ring; 3-a gas circuit control structure; 31-a valve body; 32-gas flow line; 33-a shut-off valve; 321-an air inlet line; 321 a-an air inlet groove; 321 b-first pathway; 321 c-a second pathway; 321 d-air-blocking structure; 322-gas outlet pipeline; 322 a-third pass; 322 b-fourth path; 323-auxiliary line; 323 a-plugging the groove; 323 b-fifth pathway; 4-a sensor; 41-a sensor body; 42-a signal acquisition board; 421-Probe.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

Example 1:

as shown in fig. 1, a gas segment measuring method of the present embodiment includes the following steps:

s1: dividing the gas concentration into at least two measurement intervals;

s3: selecting a corresponding sensor 4 to measure the gas concentration;

s4: the sensor 4 simultaneously monitors the change of the gas concentration in the measuring process, and the sensor 4 used for measuring is replaced in time.

In the field of gas analysis, there is often a need for users to measure a wide range of gas concentrations, such as from ppm levels to% levels, however, almost all gas sensors currently fail to meet such a wide range of measurement accuracy requirements. For oxygen concentration measurements from 1ppm to 25%, fuel cells or zirconia-based sensors are commonly used, but none of these sensors can meet the accuracy requirements in the range of 1ppm to 25%, and in some ranges only provide observations showing trends, and measurement accuracy is not guaranteed. Meanwhile, the electrochemical gas sensor has a shortened service life as the measured gas concentration increases, for example, when the oxygen sensor for measuring the ppm level fuel cell is used for measuring the% level gas concentration, the internal electrode thereof is rapidly consumed, and the service life is shortened. If the accuracy requirement in a wide range is to be met, several gas analyzers of different principles must be used for simultaneous measurement. However, this method requires the user to purchase multiple instruments, and is expensive to use and maintain, and thus is difficult to be widely used.

By applying the gas sectional measurement method, the number of the sensors 4 for measurement is divided by dividing the measurement interval, so that different working modes are defined, different working modes are adopted corresponding to different measurement intervals by combining the trend of gas concentration change, and the precision of a gas concentration measurement result is improved. Meanwhile, the number of the sensors 4 required to be used according to the requirement of high-precision measurement is reduced, the measurement cost is reduced, the use of an electrochemical gas sensor is avoided, the service life of the sensors 4 is effectively prolonged, and the replacement frequency is reduced.

Before the gas measurement, preparation is performed, including but not limited to partitioning the gas concentration as described in step S1, specifically, in the measurement of the gas wide range, the wide range is subdivided into different measurement intervals again, a suitable sensor is selected according to each measurement interval, and different operation modes are formulated, so that different operation modes can be adopted for different measurement intervals in the actual measurement process, and the measurement accuracy is further improved.

The wide range is a range defined by the existing sensor technology and the actual user requirement, and the range exceeds the measuring range of some sensors (or is within the measuring range of the sensors, but the measuring precision of a part of sections is poor and cannot meet the user using requirement), but is the measuring range required by the user.

After the preparation is completed, the actual measurement process is performed, that is, steps S2-S4 are performed, wherein step S2 is performed to enable the gas sectional measurement system to grasp the measurement interval corresponding to the gas concentration in the space to be measured, and then select the corresponding working mode and the sensor 4 in the corresponding working mode to perform the measurement of the gas concentration, the gas sectional measurement system records the gas concentration at each time point in the measurement time period, for example, the length of the measurement time is generally between 200ms and 2S, and then the change trend of the gas concentration in the space to be measured in the measurement time period is analyzed, and then different working modes are switched in time to perform the measurement of the gas concentration.

Specifically, in step S2, the gas segment measurement system is in the M3 mode after being turned on, and further the measurement interval corresponding to the measured gas concentration is determined according to the measurement result of the elevation sensor, and the operation mode is switched according to the measurement result.

The following describes each specific step of the gas segment measurement method.

In the specific embodiment provided by the present disclosure, each measurement interval corresponds to at least one sensor 4 for measuring the gas concentration in the measurement interval.

A specific measurement of the measurement interval will now be described, in which the wide range of the gas is divided into a plurality of measurement intervals, each measurement interval corresponding to at least one sensor 4, thereby ensuring the accuracy of the measurement by the sensors 4.

Specifically, the measurement intervals include, as an option, a high concentration interval, an intermediate concentration interval, and a low concentration interval;

the sensors 4 include an elevation sensor for measuring a high concentration zone and a low-range sensor for measuring a low concentration zone, and the elevation sensor and the low-range sensor are used together for measuring an intermediate concentration zone.

A practical solution is now given by the measurement interval and the arrangement of the corresponding sensors 4, wherein the measurement interval is divided into a high concentration interval, an intermediate concentration interval and a low concentration interval according to the gas concentration from high to low, wherein the gas concentration is divided into C0, C1, C2 and C3 from low to high, the high concentration interval is located between C2 and C3, the intermediate concentration interval is located between C2 and C1, and the low concentration interval is located between C1 and C0.

Sensor 4 includes two elevation sensors and two low sensors, and there are three operating modes of sensor 4, which are defined as M1: only the low range sensor is operating; m2: both the low-range sensor and the elevation sensor work; m3: only the elevation sensors operate.

In the specific embodiment provided in the present disclosure, as an option, the method for selecting the corresponding sensor 4 in step S3 is:

s302: judging the concentration variation trend of the gas to be measured and the measurement interval corresponding to the gas concentration, and selecting a corresponding sensor 4;

s303: the result measured by the sensor 4 is output.

Now, step 3 is supplemented, wherein the selection of the sensor 4, i.e. the selection of the working mode, depends on the measurement interval in which the gas to be measured is located, and then different working modes are selected; when the concentration of the measured gas changes, the working mode needs to be switched in order to ensure the measurement accuracy, and at this time, a switching point of the working mode needs to be selected according to the concentration change trend of the measured gas, for example, when the concentration change trend is up, the working mode switching point is the upper limit of the middle concentration interval; when the trend is downward, the working mode switching point is the lower limit of the middle concentration range, and the sensor 4 is ensured to be switched in time so as to improve the measurement precision.

Specifically, the variation trend can be divided into an ascending trend and a descending trend, and the selection of the working mode and the corresponding output measurement result are different, which are described below.

Before the introduction, the measurement of the elevation sensors is defined as CH, and the measurement of the low-range sensors is defined as CL.

Specifically, as an option, in step S302, when the concentration variation trend of the gas to be measured conforms to the descending trend, when the gas concentration is higher than the lower limit value of the intermediate concentration interval, the elevation sensor operates alone; when the gas concentration is lower than the lower limit value of the middle concentration interval, the elevation sensor and the low-range sensor work together;

The description will now be made in a down trend, where at power-on, the gas segment measurement system is operating and at M3, i.e. only the elevation sensor is used for gas concentration measurement, and the output of the gas segment measurement device is CH.

Because the gas concentration of the space to be measured is in a descending trend, when the gas concentration in the space to be measured is measured by the elevation sensor to be less than C1, the gas sectional measurement system is in M2, namely the low-range sensor is started simultaneously and used for measuring the gas concentration together with the elevation sensor, and the output result CH of the gas sectional measurement device is obtained.

And the gas concentration in the space to be measured continuously decreases, and when the low-range sensor and the elevation sensor measure that the gas concentration in the space to be measured is less than C1, the gas sectional measurement system is kept at M2, and the output result CL of the gas sectional measurement device is obtained.

Specifically, the selection of the operation mode and the output result of the gas concentration in the downward trend are as follows:

satisfies the conditions	Mode of operation	Gas concentration output result
			Starting up	M3	CH
CH＜C1	M2	CH
			CH≤C1，CL≤C1	M2	CL

Specifically, as an option, in step S302, when the concentration variation trend of the gas to be measured corresponds to an ascending trend, when the gas concentration is lower than the upper limit value of the intermediate concentration interval, the elevation sensor and the low sensor work together; when the gas concentration is higher than the upper limit value of the middle concentration interval, the elevation sensor works independently;

An up-trend scenario will now be described in which, when the gas concentration is less than C2, the gas segment measurement system begins operating and is at M2, i.e., the low and elevation sensors work together and are used for gas concentration measurements, and the output of the gas segment measurement device is CL.

Because the gas concentration of the space to be measured is in the ascending trend, when the height sensor measures that the gas concentration in the space to be measured is less than C2, and the low sensor measures that the gas concentration in the space to be measured is greater than C2, the gas sectional measurement system is kept at M2, and the output result CL of the gas sectional measurement device is obtained.

And when the low-range sensor and the elevation sensor measure that the gas concentration in the space to be measured is less than or equal to C2, the gas sectional measurement system is switched to M3, and the output result CH of the gas sectional measurement device is obtained.

Specifically, the selection of the operation mode and the output result of the gas concentration in the rising trend are as follows:

satisfies the conditions	Mode of operation	Gas concentration output result
			CL≤C2，CH≤C2	M2	CL
CL＞C2，CH≤C2	M2	CL
			CL＞C2，CH＞C2	M3	CH

Generally speaking, there are hundreds of sensors for measuring the concentration of a gas, each sensor has a corresponding measurement component (i.e., a test object) and a measurement range, and the measurement accuracy of the sensor can be ensured only when the measurement component and the measurement range of the selected sensor are matched with the component and the concentration of the gas to be measured. Such as: sensors based on electrochemical principles, some sensors can only be used for measuring ppm level (usually below 1000 ppm), and when the concentration is too high, the sensors can not accurately measure and can be quickly exhausted (such sensors are usually called microsensors); some sensors are only suitable for measuring% levels and the concentration is too low to measure accurately (such sensors are often called constant sensors).

The gas subsection measurement method divides the measurement range required by a user into a plurality of intervals, each interval is measured by using the sensor 4 meeting the precision requirement, and the measurement results of each sensor 4 are combined, so that the precision requirement in the whole measurement range can be met, a plurality of instruments are not required to be used, and the use and maintenance cost of the user is reduced. In the technical scheme, as the sensors 4 are adopted, in order to reduce the service life consumption of the sensors 4, when the measurement range of one sensor is exceeded, the sensor is closed and is switched to other sensors 4 for measurement, so that the service life of the sensors 4 is protected.

Meanwhile, the gas with different concentration ranges can be measured by selecting the sensors 4 with different measuring ranges, the range of the gas sectional measuring method is expanded, and the market competitiveness of the gas sectional measuring device is improved.

Example 2:

as shown in fig. 2 to 8, the present embodiment introduces a gas segment measuring device based on embodiment 1, the gas segment measuring device including a sensor 4;

the gas sectional measuring device further comprises a base body 1, a cavity 11 located on the base body 1 and a packing device 2 used for sealing the cavity 11, the cavity 11 is provided with a plurality of cavities, a sensor 4 is correspondingly arranged in each cavity 11, and a gas circuit control structure 3 is further arranged on the base body 1.

Since the measurement range of existing gas sensors is typically narrow, a user may need to perform gas concentration measurements over a wider range. In the prior art, part of the sensors are used beyond the range, which shortens the service life of the sensors and reduces the measurement precision.

The gas sectional measuring device is designed for overcoming the defects of the existing gas sensor, and by using the gas sectional measuring device, the requirement on measuring precision in a wide range can be met, the number of used equipment is reduced, the service life of the gas sectional measuring device is ensured, the frequency of equipment replacement is reduced, and the replacement and maintenance cost is reduced.

Specifically, the present gas segment measuring apparatus uses a plurality of sensors 4 for measurement of gas concentration, each sensor 4 corresponding to measurement of gas concentration of one segment, which may be referred to as a sensor module for a combination of the plurality of sensors 4.

Now, a description is given of a gas measurement process by combining a specific structure of the gas sectional measurement device, specifically, when the gas sectional measurement device is required to measure gas, a sensor module is placed in the seat body 1, the gas sectional measurement device is started and the sensor module is in a start-up state, and then sample gas is introduced into the seat body 1; the control module starts an initial mode to open one or more shut-off valves 33 in the gas path control structure 3, so that the sample gas flows to the sensor 4 corresponding to the start-up state, the sensor 4 corresponding to the start-up state measures the range of the gas concentration, and then the corresponding working mode is selected according to the measurement interval and the variation trend of the gas concentration and the concentration of the sample gas is measured in real time.

With reference to the gas segment measurement method described in embodiment 1, when the gas segment measurement system detects a change in the content of the measured gas, the working mode of the sensor module needs to be switched, that is, the control module opens the shut-off valve 33 corresponding to one or more cavities 11 according to the gas content change trend and the corresponding measurement interval, so that the one or more cavities 11 are in a normal measurement state; and simultaneously closing the corresponding shut-off valves 33 of other cavities 11 to cut off the contact of the sensors 4 and the gas to be detected, thereby avoiding unnecessary loss of the sensors 4.

The following describes the gas measurement process in detail with reference to the specific structure of each component of the gas-segment measuring device.

In the specific embodiments provided by the present disclosure, the air path control structure 3 may be configured in any suitable structure. Alternatively, the air passage control structure 3 comprises a valve body 31 connected with the seat body 1, a shut-off valve 33 detachably arranged on the valve body 31 and a gas flow pipeline 32 positioned in the valve body 31;

the gas flow pipeline 32 comprises an air inlet pipeline 321 and an air outlet pipeline 322 which are communicated with each other, the air inlet pipeline 321 is communicated with the outside, the air outlet pipeline 322 is communicated with the cavity 11, and the air inlet pipeline 321 is connected with the air outlet pipeline 322 through a shutoff valve 33.

Now, the process of the gas entering the seat body 1 will be described with reference to the specific structure of the gas path control structure 3, wherein the valve body 31 is connected to the seat body 1 and provides an installation position for the shut-off valve 33 and the gas flow pipeline 32, so as to control the gas flowing into the seat body 1, specifically, the gas flow pipeline 32 provides a channel for the gas flowing, which functions as a gas pipe, and the gas flow pipeline 32 ensures the monitoring of the smoothness of the gas flowing and the timely remedy of the gas flowing disorder through the design of its own structure. The shut-off valve 33 plays a role of a switch, the shut-off valve 33 controls whether gas can enter the seat body 1, and meanwhile, when the plurality of cavities 11 and the sensors 4 in the corresponding cavities 11 are arranged, the shut-off valve 33 also controls the gas to enter and flow out of a specific cavity 11.

Through the setting of gas circuit control structure 3, both guaranteed that gas can get into in the pedestal 1, realized the control to the concrete direction of gas flow again, combine the setting of a plurality of sensors 4, for gaseous measurement provides multiple mode, corresponds different mode through the measuring range of difference, has effectively improved measuring precision.

The following is a description of the specific structure of each component of the gas path control structure 3.

Specifically, as an option, the intake pipe 321 includes an intake groove 321a, a first passage 321b, and a second passage 321c that are sequentially communicated, the intake groove 321a communicates with the outside, the first passage 321b is provided with an air blocking structure 321d, and the second passage 321c is connected to the shutoff valve 33.

The intake process will now be described with reference to the specific structure of the intake pipe 321, wherein the intake pipe 321 is the first half of the gas flow pipe 32, which plays a role of guiding the gas into the shut-off valve 33, and the gas flow in the intake pipe 321 is monitored by the arrangement of the gas blocking structure 321 d.

Specifically, the air inlet groove 321a is used for arranging an air inlet joint to facilitate connection with an external air pipe; the gas resistance structure 321d is arranged on the first passage 321b, the gas resistance structure 321d is a small-diameter pipeline which plays a role in connection between two large-diameter pipelines, when gas passes through the gas resistance structure 321d, obvious pressure difference can be generated on two sides of the gas resistance structure 321d, pressure on two sides of the gas resistance structure 321d can be respectively measured by pressure difference measuring sensors arranged on two sides of the gas resistance structure 321d in a matched mode, and therefore the pressure difference value on two sides of the gas resistance structure 321d can be obtained.

Specifically, as an option, the gas outlet pipeline 322 includes a third passage 322a and a fourth passage 322b which are communicated in sequence, the third passage 322a is connected with the shutoff valve 33, and the fourth passage 322b is respectively communicated with the cavity 11 and the third passage 322 a.

The gas inlet process will now be described with reference to the specific structure of the gas outlet line 322, wherein the gas outlet line 322 is the latter half of the gas flow line 32 and serves to guide the gas into the chamber 11. Specifically, the gas is guided into the cavity 11 through the gas outlet pipeline 322, and then is measured by the sensor 4 in the cavity 11.

Specifically, as an option, the gas flow line 32 further includes an auxiliary line 323, the auxiliary line 323 includes a blocking groove 323a and a fifth passage 323b which are sequentially communicated, the blocking groove 323a is communicated with the outside, a blocking block is detachably disposed on the blocking groove 323a, and the fifth passage 323b is communicated with the fourth passage 322 b.

Now, the structure of the gas flow line 32 is supplemented, and the gas flow line 32 is supplemented with a function of timely remedying the gas flow failure, wherein the auxiliary line 323 is an additional channel in the gas flow line 32, the auxiliary line 323 is communicated with the gas outlet line 322, that is, the gas outlet line 322 is close to the cavity 11, and when the gas flow line 32 is blocked, the auxiliary line 323 is opened to convey gas into the cavity 11.

In general, the auxiliary line 323 remains closed under the plugging action of the plugging block while the gas flow line 32 remains flowing; meanwhile, the diameter of the blocking groove 323a is also larger than that of the fifth passage 323b, and the function of the blocking groove 323a is the same as that of the gas inlet groove 321a and the first passage 321b, which is not described herein again.

In the embodiments provided by the present disclosure, the gas segment measuring device may be configured in any suitable configuration. Alternatively, the closure packing 2 comprises a cover plate 21, a sealing structure and at least one knob 22, the cover plate 21 being fixed to the housing 1;

one end of the cavity 11 is closed by a sealing structure 23, and the other end of the cavity 11 is closed by a knob 22.

The seat body 1 is also provided with a sealing cavity 13 communicated with the cavity body 11, the sealing structure 23 is arranged in the sealing cavity 13, and the cover plate 21 shields the sealing cavity 13;

the sealing structure comprises a thread positioned on the sealing cavity 13 and a pressing ring 231 matched with the thread, and the pressing ring 231 is connected with the sensor 4;

the knob 22 is detachably connected with the cavity 11, and the knob 22 corresponds to the cavity 11 one by one.

Now, the structure of the gas sectional measuring device is supplemented, wherein the cavity 11 and the sealing cavity 13 are vertically arranged in the base body 1 in a penetrating manner, and in the measuring process of gas concentration, the measured gas only enters and flows out of the cavity 11 through the gas path control structure 3, namely the cavity 11 needs to be sealed, so that the falling of the sensor 4 is avoided while the measuring result is ensured.

Specifically, the signal acquisition board 42 is arranged to seal one end of the cavity 11, the knob 22 is arranged at the other end of the cavity 11, and the knob 22 and the signal acquisition board 42 are arranged oppositely to further seal two ends of the cavity 11.

Specifically, the structure of the knob 22 is supplemented, one end of the knob 22 is provided with a connecting structure which is detachably connected with the cavity 11, such as detachable connecting modes of threaded connection, bolt connection, flange connection, pin connection, key connection and the like, and meanwhile, the connecting structure also plays a role in jacking up the sensor 4; the other end of the knob 22 is provided with a strip-shaped boss, and the strip-shaped boss is convenient for the knob 22 to be taken down.

Now referring to the sealing structure 23, as shown in fig. 6, for the sealing cavity 13, the sealing cavity 13 is actually a through hole communicated with the cavity 11, and the joint of the cavity 11 and the sealing cavity 13 is closed in order to place the sensor 4 in the cavity 11 for a long time. Meanwhile, the lower end of the sealing cavity 13 is provided with a boss, the boss separates the sealing cavity 13 from the cavity 11, a sealing groove is formed in the boss, a sealing ring 232 is placed in the sealing groove, and the pressing ring 231 and the signal acquisition board 42 are sequentially arranged above the sealing ring 232 from top to bottom.

In the specific embodiments provided by the present disclosure, the sensor 4 may be configured in any suitable configuration. Alternatively, the sensor 4 includes a sensor body 41, a signal acquisition board 42 disposed on the cavity 11, and an annular metal layer connected to the signal acquisition board 42;

still be equipped with wiring mouth 12 on the pedestal 1, be equipped with on the signal acquisition board 42 with annular metal level assorted probe 421, probe 421 one end is connected with sensor body 41 electricity through annular metal level, the probe 421 other end is connected with wiring mouth 12 electricity.

The function of the sensor 4 will now be described with reference to the specific structure of the sensor 4, in which the sensor 4 measures the concentration of the gas and converts the gas concentration into an electrical signal, specifically, the sensor body 41 performs the measurement function, and the signal collecting board 42 receives the signal from the sensor body 41 and transmits the signal. The function of the annular metal layer is described in application No. 201720108377.8, entitled electrochemical sensor 4 with annular interface.

Specifically, the connection manner of the signal acquisition board 42 and the cavity 11 has been explained in the description of the sealing structure 23, and is not described herein again.

Example 3:

the present embodiment explains the structure of the gas segment measuring device on the basis of embodiment 2, that is, a practical solution is given.

As shown in fig. 2-7, the base 1 has two cavities 11, one cavity 11 has an elevation sensor disposed therein, and the other cavity 11 has a low-range sensor disposed therein; a valve body 31 is connected to one side surface of the seat body 1, a plurality of shut-off valves 33 are arranged above the valve body 31, and an air path control structure 3 is arranged in the valve body 31.

By combining the embodiment 1 and the embodiment 2, the two cavities 11 correspond to the two sensors 4, the two sensors 4 correspond to the two measurement intervals, and meanwhile, the cross part is designed between the two measurement intervals, when the content of the measured gas is located at the cross part, the two sensors 4 work together to measure the gas content, and the design of the cross part avoids the sudden change of the measurement result when the elevation sensor and the low-range sensor are switched, so that the accuracy of the measurement result is ensured.

Preferably, the arrangement of the cross portion also corresponds to the working mode of the high-range sensor and the low-range sensor in embodiment 1 for simultaneously measuring, which is beneficial to improving the accuracy of the measurement result.

Specifically, since there are two cavities 11, the air path control structure 3 includes four independent air flow pipelines 32, and each two air flow pipelines 32 correspond to one cavity 11 and provide air inlet and outlet channels for this cavity 11.

Considering that the four gas flow pipes 32 are identical in structure and are only arranged at different positions of the valve body 31, taking one of the gas flow pipes 32 as an example to explain the specific structure of the gas flow pipe 32, for the gas inlet pipe 321, a gas inlet groove 321a is provided on an end surface of the valve body 31, a first passage 321b is a straight hole communicating with the gas inlet groove 321a, and the first passage 321b is parallel to the length direction of the valve body 31; the second passage 321c is a straight hole communicating with the first passage 321b, and the second passage 321c is perpendicular to the first passage 321 b.

For four gas flow lines 32, two gas inlet slots 321a are oppositely disposed. The first passages 321b are parallel passages arranged between the air inlet grooves 321a, so that the area of the air inlet is increased, the efficiency of air flow is improved, and the integral blockage of the air passages caused by the blockage of a single pore channel is prevented.

As for the gas outlet pipe 322, the third passage 322a is a straight hole provided in parallel with the second passage 321c, and the third passage 322a and the second passage 321c are provided in the width direction of the valve body 31; the fourth passage 322b is a straight hole connecting the third passage 322a and the chamber 11, and the fourth passage 322b and the first passage 321b are located at different heights of the valve body 31, so that they do not intersect each other.

For the auxiliary pipe 323, the blocking groove 323a is provided on the end face of the valve body 31, and the blocking groove 323a and the gas inlet groove 321a are located on different end faces of the valve body 31; the fifth passage 323b is a straight hole communicating with the fourth passage 322b, that is, the fifth passage 323b and the fourth passage 322b are located on the same horizontal plane.

Specifically, one end of the cavity 11, which is far away from the knob 22, is provided with a signal acquisition board 42 for sealing the cavity 11, the lower end of the cavity 11 is provided with the knobs 22 for sealing the cavity 11, and one knob 22 corresponds to one cavity 11. The signal acquisition board 42 is matched with the upper end of the knob 22 so as to fix the sensor 4 in the cavity 11.

Meanwhile, the outlet of the fourth passage 322b is located at the upper end of the knob 22, so that the knob 22 is prevented from blocking the fourth passage 322b, and gas can flow into the cavity 11.

The design achieves the effects of low cost and simple manufacture, and lays a solid foundation for the wide-range popularization and application of the product.

Example 4:

this embodiment describes a gas segment measuring system for performing a wide-range measurement of gas using the gas segment measuring apparatus of embodiment 2, on the basis of embodiment 2.

As shown in fig. 2 to 8, a gas segment measuring system of the present embodiment includes a gas segment measuring device;

the gas subsection measuring system also comprises a signal transmission module and a control module, wherein the signal transmission module receives signals from the gas subsection measuring device and transmits the signals to the control module, and the control module controls the opening and closing of a shut-off valve 33 in the gas subsection measuring device.

The gas sectional measuring system supplements the gas measuring process on the basis of embodiment 1, wherein the gas sectional measuring device is used for measuring the gas concentration, the signal transmission module plays a role in signal transmission, specifically, the signals transmitted by the signal transmission module are of two types, namely, the working mode of the gas sectional measuring device is selected according to the result of the primary measurement of the gas concentration by the gas sectional measuring device, and the measuring result of the gas sectional measuring device in the gas concentration measuring process is selected.

The control module controls the work of the gas subsection measuring device on the basis of the signal transmitted by the signal transmission module, firstly, the working mode of the gas subsection measuring device is selected, namely when the gas concentration is in different measuring intervals, the control module controls the corresponding sensor 4 to be used for measuring, specifically, the shut-off valve 33 corresponding to the sensor 4 is controlled to be in an open state, the shut-off valves 33 of the other sensors 4 are controlled to be in a closed state, and then the gas enters the corresponding cavity 11 through the gas circuit control structure 3 and is measured by the sensor 4 in the cavity 11; and secondly, monitoring the change of the gas concentration, and replacing the sensor 4 for measurement in time, specifically, controlling the opening and closing of the shut-off valve 33, so that the gas enters the cavity 11 corresponding to the open state of the shut-off valve 33.

Preferably, the control module may be a Freescale single chip microcomputer, such as MC9S12XS128 MAA; or an STM singlechip, such as STM32F407ZGT 6.

Through the arrangement of the gas sectional measurement system, the working process of the gas sectional measurement device is controlled, the automatic operation is realized, and the labor input is reduced; meanwhile, the control module is switched to the working modes of the gas sectional measuring device, and different working modes are adopted for different measuring intervals, so that the gas concentration measuring precision is improved.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.

Claims

1. A gas subsection measurement method is characterized by comprising the following steps:

s1: dividing the gas concentration into at least two measurement intervals;

s3: selecting a corresponding sensor (4) for measuring the gas concentration;

s4: the sensor (4) simultaneously monitors the change of the gas concentration in the measuring process, and the sensor (4) used for measuring is replaced in time.

2. The gas segment measuring method according to claim 1, characterized in that: each measurement interval corresponds to at least one sensor (4) for measuring the gas concentration in the measurement interval.

3. The gas segment measuring method according to claim 1, characterized in that: the measuring interval comprises a high-concentration interval, a middle-concentration interval and a low-concentration interval;

the sensors (4) comprise an elevation sensor for measuring a high concentration interval and a low-range sensor for measuring a low concentration interval, and the elevation sensor and the low-range sensor are jointly used for measuring an intermediate concentration interval.

4. The gas segment measuring method according to claim 3, wherein the method of selecting the corresponding sensor (4) in step S3 is:

s302: judging the concentration variation trend of the gas to be measured and the measurement interval corresponding to the gas concentration, and selecting a corresponding sensor (4);

s303: and outputting the result measured by the sensor (4).

5. The gas segment measuring method according to claim 4, characterized in that: in step S302, when the concentration variation trend of the gas to be measured conforms to a downward trend, when the gas concentration is higher than the lower limit value of the intermediate concentration interval, the elevation sensor operates alone; when the gas concentration is lower than the lower limit value of the middle concentration interval, the elevation sensor and the low-range sensor work together;

6. The gas segment measuring method according to claim 4, characterized in that: in step S302, when the concentration variation trend of the gas to be measured meets the rising trend, when the gas concentration is lower than the upper limit value of the intermediate concentration interval, the elevation sensor and the low-range sensor work together; when the gas concentration is higher than the upper limit value of the middle concentration interval, the elevation sensor works independently;

7. A gas sectional measurement device is characterized in that: a measurement for the gas segment measuring method according to any one of claims 1 to 6;

a gas segment measuring device comprising a sensor (4) according to any one of claims 1 to 6;

the gas subsection measuring device further comprises a base body (1), a cavity (11) located on the base body (1) and a packing device (2) used for sealing the cavity (11), the cavity (11) is provided with a plurality of sensors (4), each sensor (4) is correspondingly arranged in each cavity (11), and a gas circuit control structure (3) is further arranged on the base body (1).

8. The gas segment measuring device according to claim 7, characterized in that: the gas path control structure (3) comprises a valve body (31) connected with the seat body (1), a shut-off valve (33) detachably arranged on the valve body (31) and a gas flow pipeline (32) positioned in the valve body (31);

the gas flow pipeline (32) comprises a gas inlet pipeline (321) and a gas outlet pipeline (322) which are communicated with each other, the gas inlet pipeline (321) is communicated with the outside, the gas outlet pipeline (322) is communicated with the cavity (11), and the gas inlet pipeline (321) is connected with the gas outlet pipeline (322) through a shutoff valve (33).

9. The gas segment measuring device according to claim 8, characterized in that: the air inlet pipeline (321) comprises an air inlet groove (321a), a first passage (321b) and a second passage (321c) which are communicated in sequence, the air inlet groove (321a) is communicated with the outside, an air resistance structure (321d) is arranged on the first passage (321b), and the second passage (321c) is connected with the shutoff valve (33).

10. The gas segment measuring device according to claim 8, characterized in that: the gas outlet pipeline (322) comprises a third passage (322a) and a fourth passage (322b) which are communicated in sequence, the third passage (322a) is connected with the shutoff valve (33), and the fourth passage (322b) is communicated with the cavity (11) and the third passage (322a) respectively.

11. The gas segment measuring device according to claim 8, characterized in that: the gas flow pipeline (32) further comprises an auxiliary pipeline (323), the auxiliary pipeline (323) comprises a blocking groove (323a) and a fifth passage (323b) which are sequentially communicated, the blocking groove (323a) is communicated with the outside, a blocking block is detachably arranged on the blocking groove (323a), and the fifth passage (323b) is communicated with the fourth passage (322 b).

12. The gas segment measuring device according to claim 7, characterized in that: the packing device (2) comprises a cover plate (21), a sealing structure (23) and at least one knob (22), wherein the cover plate (21) is fixed on the base body (1);

one end of the cavity (11) is sealed by a sealing structure (23), and the other end of the cavity (11) is sealed by a knob (22).

13. The gas segment measuring device according to claim 12, characterized in that: the seat body (1) is also provided with a sealing cavity (13) communicated with the cavity body (11), the sealing structure (23) is arranged in the sealing cavity (13), and the cover plate (21) shields the sealing cavity (13);

the sealing structure (23) comprises a thread positioned on the sealing cavity (13) and a pressing ring (231) matched with the thread, and the pressing ring (231) is connected with the sensor (4);

the knob (22) is detachably connected with the cavity (11), and the knob (22) corresponds to the cavity (11) one by one.

14. The gas segment measuring device according to claim 7, characterized in that: the sensor (4) comprises a sensor body (41) and a signal acquisition board (42) arranged on the cavity (11), wherein an annular metal layer is arranged on the sensor body (41);

still be equipped with wiring mouth (12) on pedestal (1), be equipped with on signal acquisition board (42) with annular metal layer assorted probe (421), probe (421) one end is passed through the annular metal layer and is connected with sensor body (41) electricity, probe (421) other end and wiring mouth (12) electricity are connected.

15. A gas staging measurement system, characterized by: comprising a gas staging device according to any one of claims 7 to 14;

the gas subsection measuring system also comprises a signal transmission module and a control module, wherein the signal transmission module receives signals from the gas subsection measuring device and transmits the signals to the control module, and the control module controls the opening and closing of a shut-off valve (33) in the gas subsection measuring device.