Gas water content and oxygen content integrated analyzer

Abstract

The invention relates to the technical field of gas analysis, in particular to a gas water content and oxygen content integrated analyzer. Comprising a dew point sensor, a sampling chamber of the dew point sensor, an oxygen sensor and a sampling chamber of the oxygen sensor, a sample gas input interface and a sample gas discharge interface which are arranged in an instrument shell, a pressure stabilizing valve, a flow meter with a flow adjusting function and a four-way valve which are used for adjusting the pressure, the flow and the flow direction in a gas path, the display screen and the circuit board are used for processing sensor signals, and the connecting pipeline is connected with the gas circuit component to form an instrument internal gas circuit. A traditional gas water oxygen analysis process needs to respectively use an oxygen content analyzer and a water content analyzer, the instrument can simultaneously measure the water content and the oxygen content in the gas, the time consumption of the process is shortened, two times of purging in the traditional process are reduced to one time, the gas consumption and the operation steps are reduced, and the cost is reduced. And interference caused by atmosphere introduction during pipeline connection is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gas analysis, and in particular to an integrated analyzer for water content and oxygen content in gas. Background Art

[0002] At present, in the process of measuring oxygen content and water content in industrial gases, two instruments, oxygen content analyzer and water content analyzer, are needed respectively. During the measurement process, the sample gas to be measured is first introduced into one of the instruments through the pipeline, and after sufficient purge, the sample gas is introduced into the sensor through the regulating valve, and a reading is obtained after waiting for a period of time. Then, the gas line connection is manually disconnected, and the sample gas to be measured is reintroduced into another instrument, and the previous steps are repeated to obtain another reading. This operation process involves two pipeline connections, thereby introducing interference from gaseous water and oxygen in the atmosphere twice, and the gas lines of the two instruments need to be purged, and the responses of the two instruments need to be waited for.

[0003] Therefore, it is urgent to integrate the functions of the oxygen content analyzer and the water content analyzer, reduce the number of gas line connections to reduce the burden of manual operation, and at the same time reduce the interference introduced by the infiltration of water and oxygen in the atmosphere when the instrument is connected once, thereby improving the measurement accuracy. In each sample gas measurement process, the gas line purge time and the waiting time for the instrument response are reduced once, thereby improving the detection efficiency. Summary of the invention

[0004] A main purpose of the present invention is to integrate the technologies of the above two detection instruments and eliminate the interference between sensors, so as to design an instrument which is easy to operate, fast in measurement, and can simultaneously measure the water content and oxygen content in the gas.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a gas water content and oxygen content integrated analyzer, including a dew point sensor and its sampling chamber, an oxygen sensor and its sampling chamber, a sample gas input interface, a sample gas discharge interface, an instrument housing, a display screen, a circuit board, a connecting pipeline, a pressure regulating valve, a flowmeter with a flow regulating function, and a four-way valve. After the measured sample gas is connected to the sample gas input interface by a pipeline outside the instrument, it is simultaneously distributed to the dew point sensor and its sampling chamber and the oxygen sensor and its sampling chamber through the connecting pipeline inside the instrument housing for analysis, and is discharged from the sample gas discharge interface after the analysis is completed; the display screen and the circuit board are electrically connected to the above two sensors; the dew point sensor and its sampling chamber select either series connection or parallel connection to form a gas path with the oxygen sensor and its sampling chamber inside the instrument housing; the instrument housing is a box body, and other components are accommodated and fixed on its surface and inside, forming a portable gas analysis instrument that can simultaneously analyze water content and oxygen content.

[0006] It is further defined that the instrument casing fixes and protects other components by mechanical connection; the display screen is installed on the surface of the instrument casing; the pressure regulating valve is installed in the front stage of the flowmeter with flow regulation function; the flowmeter with flow regulation function is installed in the front stage of the four-way valve; the four-way valve is installed in the front stage of the sample gas discharge interface.

[0007] It is further defined that the four-way valve is a two-position four-way valve, which is connected in parallel with the oxygen sensor and its sampling chamber in the gas circuit. By rotating the valve core, the oxygen sensor and its sampling chamber are switched between two states: connected to the gas circuit to receive the sample gas to be measured, and isolated and sealed from the gas circuit.

[0008] It is further defined that when the dew point sensor and its sampling chamber and the oxygen sensor and its sampling chamber are connected in series front and back to form an internal gas circuit, they are connected through connecting pipes to form a front and back stage relationship, the dew point sensor and its sampling chamber are in the front stage, and the oxygen sensor and its sampling chamber are in the back stage. The sample gas to be measured first passes through the dew point sensor for analysis by the dew point sensor and then passes through the oxygen sensor.

[0009] It is further defined that when the dew point sensor and its sampling chamber are connected in parallel with the oxygen sensor and its sampling chamber to form an internal gas circuit, one end of the dew point sensor and its sampling chamber is connected to the sample gas discharge interface of the rear stage of the oxygen sensor and its sampling chamber, and the other end is connected to the front stage component of the oxygen sensor and its sampling chamber. The sample gas to be measured is divided into two paths, passing through the dew point sensor and the oxygen sensor respectively.

[0010] It is further defined that, between the front-stage components and the rear-stage components, other components are allowed to be connected through connecting pipes under the condition that the front-stage and rear-stage relationships are correct; under the condition that the front-stage and rear-stage relationships of each component are correct, the actual connection relationship between the components will not be affected by changes in the instrument function.

[0011] It is further defined that the instrument casing is made of metal, the negative pole of the circuit board is connected to the instrument casing; the dew point sensor and its sampling chamber, the oxygen sensor and its sampling chamber, the connecting pipeline, the pressure regulating valve, the flow meter with flow regulation function, and the four-way valve are connected to the instrument casing, and the above components are electrically connected to form a common ground shielding layer.

[0012] It is further defined that the oxygen sensor and its sampling chamber are composed of three parts: a sampling chamber shell, a sensor bracket, and an oxygen sensor. The sensor bracket and the oxygen sensor are enclosed inside the sampling chamber shell. The oxygen sensor is supported by the sensor bracket, and there is no direct contact between the oxygen sensor and the sampling chamber shell.

[0013] In combination with the above technical solutions, it can be seen that the beneficial effects of the integrated gas water content and oxygen content analyzer proposed by the present invention are as follows:

[0014] The present invention places a dew point sensor and an oxygen sensor in a portable instrument housing, inputs a sample gas to be measured through a single sample gas input interface, distributes the sample gas to the dew point sensor and the oxygen sensor through connecting pipelines for simultaneous detection, integrates the functions of two instruments that need to be used separately in a traditional analysis process, and eliminates mutual interference between sensors through reasonable connection of internal pipelines, thereby reducing the number of operating steps in the process of measuring the water content and oxygen content of the gas, reducing the interference introduced by the atmosphere, and shortening the detection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] FIG1 is a diagram of the internal structure of the present invention, in which a dew point sensor and its sampling chamber are in series with an oxygen sensor and its sampling chamber;

[0017] Fig. 2 is an appearance diagram of the present invention;

[0018] FIG3 is a structural diagram of an oxygen sensor and its sampling chamber;

[0019] FIG4 is a flow chart of an optional embodiment of the present invention, in which the dew point sensor and its sampling chamber are in series with the oxygen sensor and its sampling chamber;

[0020] FIG5 is a flow chart of an optional embodiment of the present invention, in which the dew point sensor and its sampling chamber are in series with the oxygen sensor and its sampling chamber;

[0021] FIG6 is a flow chart of an optional embodiment of the present invention, in which the dew point sensor and its sampling chamber are in parallel mode with the oxygen sensor and its sampling chamber;

[0022] In the figure: 1-dew point sensor and its sampling chamber, 2-oxygen sensor and its sampling chamber, 3-sample gas input interface, 4-sample gas discharge interface, 5-instrument housing, 6-display screen, 7-circuit board, 8-connecting pipeline, 9-pressure regulating valve, 10-flow meter with flow regulating function, 11-four-way valve, 201-sampling chamber housing, 202-sensor bracket, 203-oxygen sensor. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] As shown in FIG1 , the present invention is a gas water content oxygen content integrated analyzer, including a dew point sensor and its sampling chamber 1, an oxygen sensor and its sampling chamber 2, a sample gas input interface 3, a sample gas discharge interface 4, an instrument housing 5, a display screen 6, a circuit board 7, a connecting pipeline 8, a pressure regulating valve 9, a flowmeter 10 with a flow regulating function, and a four-way valve 11. The sample gas to be measured is input from the external connecting pipeline to the sample gas input interface 3, and the connecting pipeline 8 includes multiple pipelines inside the instrument. The sample gas to be measured is distributed to the dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2 through the connecting pipeline 8 for simultaneous analysis. The data and electrical signals generated by the sensor are transmitted to the circuit board 7 for processing, and the processed results are displayed on the display screen 6. Since there are two types of sensors, one of the two modes of series connection or parallel connection needs to be selected inside the instrument to connect the sensor to the gas path. The series connection and parallel connection mentioned here refer to the relative connection relationship between the two sensors in the gas path, and both connection modes are feasible for the realization of the function. The instrument described in the present invention is a portable instrument. The instrument housing 5 is a box, and other components are accommodated and fixed on its surface and inside. During use, the instrument can be carried by hand and the position of the instrument can be moved quickly. Before use, only a single pipeline needs to be connected to the sample gas input interface 3 to simultaneously analyze the water content and oxygen content in the sample gas being measured.

[0025] There is a certain installation order for each component in the instrument. The pressure regulating valve 9 provides a stable air pressure to the flow meter 10 with flow regulating function. When the pressure input from the sample gas input interface 3 changes, the pressure output by the pressure regulating valve 9 is constant. Therefore, the pressure regulating valve 9 is installed in the front stage of the flow meter 10 with flow regulating function to ensure that the flow displayed by the flow meter 10 with flow regulating function will not change due to changes in external input pressure; the main purpose of the flow meter 10 with flow regulating function is to indicate the flow for the oxygen sensor and its sampling chamber 2, so the flow meter 10 with flow regulating function is installed in the front stage of the four-way valve 11. The four-way valve 11 is a two-position four-way valve, which is connected in parallel with the oxygen sensor and its sampling chamber 2 in the gas circuit. By rotating the valve core, the oxygen sensor and its sampling chamber 2 are switched between two states: connected to the gas circuit to receive the sample gas to be measured, and isolated from the gas circuit to seal the oxygen sensor. When the instrument is not in use, the four-way valve 11 is rotated to isolate the oxygen sensor from the gas circuit. The four-way valve 11 is connected to the sample gas discharge interface 4, and the sample gas to be measured is discharged from the instrument through the sample gas discharge interface 4.

[0026] In the actual implementation of the scheme, one of the two schemes, series and parallel, will be selected to connect the dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2. The two schemes have their own advantages and disadvantages, and it is impossible to directly compare the advantages and disadvantages. The following analyzes their advantages and disadvantages and explains the specific implementation methods.

[0027] When the dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2 are connected in series to form an internal gas path, they are connected through a connecting pipe 8 to form a front-to-back relationship, with the dew point sensor and its sampling chamber 1 being in the front stage and the oxygen sensor and its sampling chamber 2 being in the back stage. The sample gas to be measured first passes through the dew point sensor, and then passes through the oxygen sensor after analysis by the dew point sensor. Since the dew point of the sample gas to be measured is related to its pressure, and there are also oxygen sensors and their sampling chambers 2 and other components in the back stage of the dew point sensor and its sampling chamber 1, there is resistance when the gas flows through these components, resulting in the pressure at the dew point sensor and its sampling chamber 1 not being equal to the atmospheric pressure. Therefore, the series scheme also needs to measure the pressure at the dew point sensor. At the same time, the sample gas to be measured can reduce the amount of sample gas because it passes through the two sensors in succession.

[0028] When the dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2 are connected in parallel to form an internal gas path, as shown in Figure 6, one end of the dew point sensor and its sampling chamber 1 is connected to the sample gas discharge interface 4 of the rear stage of the oxygen sensor and its sampling chamber 2, and the other end is connected to the front stage component of the oxygen sensor and its sampling chamber 2. The measured sample gas is divided into two paths, passing through the dew point sensor and the oxygen sensor respectively. In this way, the pressure at the dew point sensor and its sampling chamber 1 is equal to the atmospheric pressure, so the parallel scheme does not need to measure the pressure at the dew point sensor. However, since the measured sample gas passes through two sensors respectively, the amount of sample gas will increase.

[0029] Between the front-stage components and the rear-stage components, under the condition that the front-stage relationship is correct, it is allowed to connect other components through the connecting pipe 8; under the condition that the front-stage relationship of each component is correct, the actual connection relationship between the components can be changed. Constraining the front-stage relationship ensures that each component can work normally. Under the condition that the constraints are met, adjusting the connection order between the components can achieve different beneficial effects: as shown in Figure 4: After the sample gas input interface 3 is connected to the pressure regulating valve 9, the pressure regulating valve 9 is then connected to the flow meter 10 with flow regulation function, and then connected to the four-way valve through the connecting pipe 8. The dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2 are simultaneously connected to the four-way valve 11, and the four-way valve 11 is connected to the sample gas discharge interface 4. In this case, the dew point sensor and its sampling chamber 1 and the oxygen sensor and its sampling chamber 2 can be isolated from the atmosphere by the four-way valve 11 at the same time. After isolation, the atmosphere cannot directly contact the sensor, thereby reducing the response time of the two sensors when converting high-concentration water oxygen signals into low-concentration signals. As shown in Figure 5: After the sample gas input interface 3 is connected to the pressure regulating valve 9 through the connecting pipe 8, the pressure regulating valve 9 is connected to the dew point sensor and its sampling chamber 1, and the dew point sensor and its sampling chamber 1 are connected to the flow meter 10 with flow regulation function, and then connected to the four-way valve 11. The four-way valve (11) is connected to the sample gas discharge interface. In this case, the air pressure at the dew point sensor and its sampling chamber 1 is the output pressure of the pressure regulating valve, and the pressure is stable and easy to measure.

[0030] The instrument housing 5 is made of metal and constitutes the chassis ground. The negative pole of the circuit board 7 is connected to the instrument housing 5. The dew point sensor and its sampling chamber 1, the oxygen sensor and its sampling chamber 2, the connecting pipeline 8, the pressure regulating valve 9, the flow meter 10 with flow regulation function, and the four-way valve 11 are connected to the instrument housing 5. The above components are electrically connected to form a shielding layer of a common ground, which reduces the electromagnetic interference of the external environment to the instrument and reduces the electromagnetic interference between sensors.

[0031] The oxygen sensor and its sampling chamber 2 are composed of three parts: a sampling chamber shell 201, a sensor bracket 202, and an oxygen sensor 203. The sensor bracket 202 and the oxygen sensor 203 are enclosed inside the sampling chamber shell 201, and the oxygen sensor 203 is supported by the sensor bracket 202, thereby avoiding direct contact between the oxygen sensor 203 and the sampling chamber shell 201.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas water content and oxygen content integrated analyzer, characterized in that: The invention comprises a dew point sensor and a sampling chamber (1), an oxygen sensor and a sampling chamber (2), a sample gas input interface (3), a sample gas discharge interface (4), an instrument housing (5), a display screen (6), a circuit board (7), a connecting pipeline (8), a pressure regulating valve (9), a flow meter (10) with a flow regulating function, and a four-way valve (11); after the sample gas to be measured is connected to the sample gas input interface (3) through a pipeline outside the instrument, it is distributed to the dew point sensor and its sampling chamber (1) and the oxygen sensor and its sampling chamber (2) through a connecting pipeline (8) inside the instrument housing (5) for analysis, and is discharged from the sample gas discharge interface (4) after the analysis is completed; the display screen (6) and the circuit board (7) are electrically connected to the above two sensors; the dew point sensor and its sampling chamber (1) are connected in series or in parallel to form a gas path with the oxygen sensor and its sampling chamber (2) inside the instrument housing (5); the instrument housing (5) is a box, and other components are accommodated and fixed on its surface and inside, forming a portable gas analysis instrument that can simultaneously analyze water content and oxygen content.

2. The integrated analyzer for water content and oxygen content in gas according to claim 1, characterized in that: The instrument housing (5) fixes and protects the other components described in claim 1 by means of mechanical connection; the display screen (6) is mounted on the shell surface of the instrument housing (5); the pressure regulating valve (9) is installed in the front stage of the flow meter (10) with flow regulating function; the flow meter (10) with flow regulating function is installed in the front stage of the four-way valve (11); the four-way valve (11) is connected to the sample gas discharge interface (4).

3. The integrated analyzer for gas water content and oxygen content according to claim 1, characterized in that: The four-way valve (11) is a two-position four-way valve, connected in parallel with the oxygen sensor and its sampling chamber (2) in the gas path, and the oxygen sensor and its sampling chamber (2) are switched between two states by rotating the valve core: connecting to the gas path to receive the sample gas to be measured, and isolating the oxygen sensor from the gas path to seal it.

4. The integrated analyzer for water content and oxygen content in gas according to claim 1, characterized in that: When the dew point sensor and its sampling chamber (1) and the oxygen sensor and its sampling chamber (2) are connected in series to form an internal gas path, they are connected via a connecting pipe (8) to form a front-to-back stage relationship, with the dew point sensor and its sampling chamber (1) being in the front stage and the oxygen sensor and its sampling chamber (2) being in the back stage. The sample gas to be measured first passes through the dew point sensor, is analyzed by the dew point sensor, and then passes through the oxygen sensor.

5. The integrated analyzer for water content and oxygen content in gas according to claim 1, characterized in that: When the dew point sensor and its sampling chamber (1) and the oxygen sensor and its sampling chamber (2) are connected in parallel to form an internal gas path, one end of the dew point sensor and its sampling chamber (1) is connected to the sample gas discharge interface (4) of the rear stage of the oxygen sensor and its sampling chamber (2), and the other end is connected to the front stage component of the oxygen sensor and its sampling chamber (2), and the sample gas to be measured is divided into two paths, passing through the dew point sensor and the oxygen sensor respectively.

6. The integrated analyzer for gas water content and oxygen content according to claim 1, characterized in that: Between the front-stage components and the rear-stage components, under the condition that the front-stage and rear-stage relationships are correct, it is allowed to connect other components through the connecting pipeline (8); under the condition that the front-stage and rear-stage relationships of each component are correct, the actual connection relationship between the components described in claim 1 will not affect the instrument function after changes.

7. The integrated analyzer for water content and oxygen content in gas according to claim 1, characterized in that: The instrument housing (5) is made of metal, and the negative pole of the circuit board (7) is connected to the instrument housing (5); the dew point sensor and its sampling chamber (1), the oxygen sensor and its sampling chamber (2), the connecting pipeline (8), the pressure regulating valve (9), the flow meter with flow regulating function (10), and the four-way valve (11) are connected to the instrument housing (5), and the above components are electrically connected to form a shielding layer with a common ground.

8. The integrated analyzer for water content and oxygen content in gas according to claim 1, characterized in that: The oxygen sensor and its sampling chamber (2) are composed of three parts: a sampling chamber housing (201), a sensor bracket (202), and an oxygen sensor (203); the sensor bracket (202) and the oxygen sensor (203) are enclosed within the sampling chamber housing (201); the oxygen sensor (203) is supported by the sensor bracket (202); and the oxygen sensor (203) has no direct contact with the sampling chamber housing (201).

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