An integrated multipoint calibration device for an exhaled gas analyzer

Abstract

The utility model discloses a kind of integrated multipoint calibration devices for exhaled gas analyzer, belong to gas analysis instrument calibration technical field.The device includes casing, first gas path component integrated in the inside of casing, second gas path component, solenoid valve group, detection component and controller.First gas path component is used to store standard sample gas, second gas path component provides clean carrier gas, solenoid valve group switches between each gas path, controlled by controller.By controlling carrier gas flow rate and sample gas carrying time, the stored single standard sample gas can be dynamically diluted into calibration gas of multiple concentration points, and sequentially measured by detection component, finally automatically complete multipoint calibration curve fitting.The utility model realizes the high integration of calibration device and the full automation of calibration process, with the advantages of simple operation, strong portability, high calibration accuracy and no need for multiple bottles of standard gas.

Description

Technical Field

[0001] This application relates to the field of gas analysis instrument technology, and specifically to an integrated multi-point calibration device for an exhaled gas analyzer. Background Technology

[0002] Exhaled gas analysis has significant applications in medical diagnosis, health monitoring, and scientific research. By detecting trace amounts of specific components (such as CO2, H2, and CH4) in human exhaled gas, it is possible to non-invasively assess the body's metabolic state, gut microbiota activity, and the risk of certain diseases. To ensure the accuracy and reliability of the analytical results, exhaled gas analyzers need to be calibrated periodically with standard gases of known concentrations before and during use.

[0003] Currently, the calibration of exhaled gas analyzers typically relies on external standard gas sources and manual operation. Common calibration methods include single-point calibration and multi-point calibration. Single-point calibration uses only a single concentration of standard gas, making it difficult to assess the instrument's linear response across the entire measurement range. Multi-point calibration, on the other hand, requires the use of multiple standard gases of different concentrations, enabling a more comprehensive calibration of the instrument's performance curves and thus improving measurement accuracy. Existing multi-point calibration processes suffer from the following prominent problems: First, the operation is cumbersome, requiring manual connection of standard gas cylinders of different concentrations, flow rate adjustment, measurement, and recording, resulting in low efficiency and high skill requirements for operators. Second, repeated manual switching of gas paths can easily introduce human error and external air pollution, affecting the accuracy of calibration results. Third, the equipment is dispersed; standard gas cylinders, flow control devices, and detection units are often placed independently, not only occupying space but also resulting in complex gas path connections, poor overall portability and integration, making it difficult to meet the needs of rapid, on-site calibration.

[0004] Therefore, there is an urgent need to develop a highly integrated and automated multi-point calibration device to achieve a rapid, accurate, and convenient multi-point calibration process for sample gases, in order to overcome the aforementioned shortcomings in existing technologies. Utility Model Content

[0005] This application provides an integrated multi-point calibration device for exhaled gas analyzers to solve the technical problems of cumbersome manual multi-point calibration operations, easy introduction of errors, and dispersed equipment with low integration in the prior art.

[0006] This application adopts the following technical solution: an integrated multi-point calibration device for an exhaled gas analyzer, comprising a housing, a chamber formed inside the housing, and a calibration mechanism disposed at the bottom of the housing. The calibration mechanism includes a first gas path assembly disposed inside the housing, the first gas path assembly being connected to a second gas path assembly, and the second gas path assembly being connected to a detection assembly. The first gas path assembly is used to store the sample gas to be tested, and the second gas path assembly is used to introduce air into the calibration mechanism to carry the sample gas and to send the mixed gas into the detection assembly, which is used to detect the composition of the sample gas. The first and second air path components are equipped with solenoid valve groups, which are used to control the air path opening and closing between the first air path component, the second air path component, and the detection component. The housing is also equipped with a controller, which is electrically connected to the solenoid valve group and the detection component. The controller is used to control the opening and closing state of the solenoid valve group and to receive and process the detection results from the detection component.

[0007] Furthermore, the solenoid valve assembly includes solenoid valve one, solenoid valve two, and solenoid valve three; solenoid valve two and solenoid valve three are disposed in the air path of the first air path assembly, and solenoid valve one is disposed in the air path of the second air path assembly; each of solenoid valve one, solenoid valve two, and solenoid valve three includes a main air intake channel, a channel A connected to the main air intake channel, and a channel B connected to the main air intake channel, and channels A and B are respectively connected to external pipelines to switch the gas flow direction of the main air intake channel.

[0008] Furthermore, the first gas path assembly includes a sample inlet, which is connected to a drying tube, which is connected to a filter, and the filter is connected to the main air inlet channel of solenoid valve two; channel A of solenoid valve two is connected to a gas storage tube, which is connected to the main air inlet channel of solenoid valve three; channel A of solenoid valve three is connected to the outside through a first sample outlet.

[0009] Furthermore, the second gas path assembly includes a flow meter, a flow valve, a gas collection bottle, a gas pump, and a drying tank; the inlet of the flow meter is connected to channel B of the solenoid valve three, and the outlet of the flow meter, the flow valve, the gas collection bottle, the gas pump, and the drying tank are connected in sequence, with the drying tank connected to the outside.

[0010] Furthermore, the main intake channel of solenoid valve two is connected to channel B of solenoid valve three, and channel B of solenoid valve two is connected to channel B of solenoid valve one.

[0011] Furthermore, the detection component includes a detection chamber, the inlet of which is connected to the main air intake channel of solenoid valve one; inside the detection chamber, a CO2 sensor, a color column spectrum and an H2 / CH4 sensor are arranged sequentially along the airflow direction.

[0012] Furthermore, the outlet of the detection chamber is connected to the outside through a second sample outlet. Additionally, a display screen is installed on one side of the casing, which is electrically connected to the controller; a communication interface is also installed on one side of the casing, which is electrically connected to the controller for exporting detection data.

[0013] Furthermore, ventilation holes are provided on the casing.

[0014] Furthermore, a valve group power switch is provided on the housing, which is used to supply power to solenoid valve one, solenoid valve two, and solenoid valve three.

[0015] Firstly, this invention achieves a high degree of integration and portable deployment of the gas calibration device through its integrated housing and internal modules. Specifically, the first gas path assembly, the second gas path group, the solenoid valve group, the detection component, and the controller are all integrated into a housing with heat dissipation holes, solving the problem of traditional calibration equipment having scattered components and occupying a large space, thus improving the device's portability and field applicability. At the same time, the detection mechanism, together with the display screen and communication interface on the housing, constitutes an intuitive human-machine interface, reducing the difficulty of operating the equipment.

[0016] Secondly, this invention achieves full automation and improved efficiency in the calibration process through the coordinated automatic control of the controller and solenoid valve assembly. It replaces traditional manual valve operation, flow regulation, and data recording, reducing the skill requirements for operators, avoiding human error, thus ensuring the consistency of the calibration and testing process, and improving the automation level and execution efficiency of calibration work.

[0017] Furthermore, this invention achieves precise multi-point calibration from a single gas source and high reliability of results by setting up a dynamic gas distribution circuit including a gas storage pipe and a multi-point detection process. Using clean carrier gas, different amounts of standard sample gas are drawn from the gas storage pipe to generate a series of concentration points, which are then measured sequentially by the detection components. Combined with existing controller processing, multi-point calibration, including zero-point calibration, can be automatically completed using standard gas, establishing an accurate concentration-response curve. This eliminates the cumbersome and error-prone switching between multiple gas cylinders, ensuring the consistency and accuracy of calibration data, thereby improving the overall measurement accuracy of the calibrated analyzer. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this application and are not intended to limit this application.

[0019] Figure 1 This is a schematic diagram of the overall structure of the integrated multi-point calibration device of this application; Figure 2This is a schematic diagram of the overall structure of the integrated multi-point calibration device of this application from another angle; Figure 3 This is a schematic diagram of the calibration mechanism in this application; Figure 4 This is a top view of the calibration facility in this application; Figure 5 This is a schematic diagram of the testing process of the integrated multi-point calibration device of this application.

[0020] Explanation of reference numerals in the attached figures: 10. Chassis; 11. Ventilation holes; 12. Display screen; 20. First gas path assembly; 21. Sample inlet; 22. Drying tube; 23. Filter; 24. Gas storage tube; 25. First sample outlet; 30. Solenoid valve assembly; 31. Solenoid valve one; 32. Solenoid valve two; 33. Solenoid valve three; 34. Valve assembly power switch; 40. Second gas path assembly; 41. Flow meter; 42. Flow valve; 43. Gas collection bottle; 44. Air pump; 45. Dryer; 50. Detection assembly; 51. Detection chamber; 52. CO2 sensor; 53. Chromatographic column; 54. H2 / CH4 sensor; 55. Second sample outlet; 60. Controller; 61. Communication interface. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," etc., mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Example 1

[0024] This embodiment discloses an integrated multi-point calibration device for an exhaled gas analyzer, aiming to provide a highly integrated, easy-to-operate device that can automatically complete the multi-point calibration process.

[0025] Reference Figures 1 to 4 The integrated multi-point calibration device includes a housing 10, the interior of which forms a chamber to accommodate the various components. Several heat dissipation holes 11 are provided on the side walls of the housing 10 to dissipate the heat generated by the internal electronic components during operation, ensuring the stability of the device's operation.

[0026] The calibration mechanism includes a first gas path assembly 20, a second gas path assembly 40, a detection assembly 50, a solenoid valve assembly 30, and a controller 60, all housed within the internal chamber of the housing 10. The first gas path assembly 20, the second gas path assembly 40, and the detection assembly 50 are connected by pipelines, forming the flow path for the calibration gas. Specifically, the first gas path assembly 20 is primarily responsible for introducing, pre-treating, and storing the calibration sample gas to be tested; the second gas path assembly 40 provides a clean airflow to carry and dilute the sample gas, forming calibration gases of different concentrations; and the detection assembly 50 is used for component analysis and concentration detection of the final mixed gas.

[0027] To precisely control the switching of gas between different paths, a solenoid valve group 30 is installed in the first gas path assembly 20 and the second gas path group 40. All valves in this solenoid valve group 30 are electrically connected to the controller 60. The controller 60 uses existing technology to control the opening and closing states of each valve in the solenoid valve group 30 according to preset program instructions, thereby dynamically changing the gas path connection relationship between the first gas path assembly 20, the second gas path assembly 40, and the detection assembly 50. At the same time, the detection signal from the detection assembly 50 is also transmitted to the controller 60 in real time, where the controller 60 receives, processes, analyzes, and stores the data.

[0028] In this technical solution, all components are centrally located inside the housing 10. This solves the problems of existing calibration equipment being scattered, occupying a large space, and being inconvenient for on-site deployment, thus improving the portability and on-site applicability of the device.

[0029] By setting up the controller 60 and the solenoid valve group 30, the valve switching, flow regulation, data recording and other operations that traditionally required manual operation are transformed into operations controlled by the controller 60. This simplifies the operation steps, reduces the skill requirements of the operators, and reduces systematic and random errors introduced by unstable or erroneous manual operation, thereby improving the automation level of the calibration process and the accuracy of the results. Example 2

[0030] Based on Example 1, referring to Figure 3 and Figure 4 , specifically: The solenoid valve assembly 30 includes three two-position three-way solenoid valves: solenoid valve 31, solenoid valve 32, and solenoid valve 33. Solenoid valves 32 and 33 are located in the gas path of the first gas path assembly 20 and are mainly responsible for controlling the flow direction of the sample gas. Solenoid valve 31 is located at the node between the second gas path assembly 40 and the detection assembly 50 and is responsible for controlling the merging of the carrier gas and the sample gas and its delivery to the detector.

[0031] Each solenoid valve (31, 32, 33) has a main intake channel, a channel A, and a channel B. The main intake channel is a normally open path, while channels A and B are selectively connected to or closed with the main intake channel depending on whether the solenoid valve is energized or de-energized, thereby realizing the switching of air flow diversion or merging.

[0032] Furthermore, the specific composition of the first air passage assembly 20 is as follows: Its starting end is the sample inlet 21, used to connect to an external standard gas cylinder or sample gas source. The sample inlet 21 is connected to a drying tube 22 via a pipeline. The drying tube 22 is filled with desiccant to remove moisture from the sample gas. The rear end of the drying tube 22 is connected to a filter 23, which is used to filter out any particulate matter that may be present in the sample gas. The clean sample gas after drying and filtration is connected to the main air inlet channel of solenoid valve 2 32 via a pipeline. Channel A of solenoid valve 2 32 is connected to a gas storage tube 24 with a certain volume via a pipeline. The gas storage tube 24 is used to temporarily store a certain amount of sample gas. The other end of the gas storage tube 24 is connected to the main air inlet channel of solenoid valve 3 33. Channel A of solenoid valve 3 33 is connected to the external environment or exhaust gas discharge pipeline through the first sample outlet 25.

[0033] Furthermore, the second air path assembly 40 is used to provide clean air, and its specific configuration is as follows: The system includes an air pump 44, whose inlet is connected to a drying tank 45 via a pipe. The drying tank 45 is in contact with the outside air and is used for preliminary filtration and drying of the intake air. The outlet of the air pump 44 is connected to a gas collecting bottle 43, which serves to buffer and stabilize the airflow. The outlet of the gas collecting bottle 43 is connected to the inlet of a flow meter 41 via a flow valve 42. The flow valve 42 is used to manually or electrically adjust the airflow, and the flow meter 41 is used to display the gas flow rate in real time. The outlet of the flow meter 41 is connected to channel B of a solenoid valve 33 via a pipe.

[0034] Reference Figure 5 The main intake channel of solenoid valve 2 32 is connected to channel B of solenoid valve 33 via a pipeline, and the air storage pipe 24 is connected between the two. Channel B of solenoid valve 2 32 is connected to channel B of solenoid valve 1 31 via a pipeline. The main intake channel of solenoid valve 1 31 leads directly to the detection component 50.

[0035] In this technical solution, the controller 60 controls solenoid valves 32 and 33 to switch to the desired state, allowing the externally introduced sample gas to flow sequentially through the drying tube 22, filter 23, the main channel of solenoid valve 32, the gas storage tube 24, and the main channel of solenoid valve 33, finally exiting from the first sample outlet 25. This effectively flushes and fills the entire gas storage tube 24 and upstream pipeline with fresh sample gas, thereby ensuring the accurate and pure concentration of the sample gas stored in the gas storage tube 24 and eliminating interference from residual gas in the pipeline.

[0036] The controller 60 controls solenoid valves 31 and 33 to switch to the desired state and starts the air pump 44. Outside air passes sequentially through the dryer 45, air pump 44, gas collection bottle 43, flow valve 42, and flow meter 41. At this time, channel B of solenoid valve 33 is closed, and the airflow flows through channel A of solenoid valve 31. Finally, it enters the detection component 50 from the main channel of solenoid valve 31 and exits from its outlet, achieving the effect of purging the detection component 50 and its related pipelines with clean air, removing any residual gas from the previous test, and preparing for the next accurate test.

[0037] The controller 60 controls solenoid valves 31 and 32 to switch to the desired state (at this time, solenoid valve 33 disconnects from the gas storage pipe 24), and starts the air pump 44. Clean air flows out from the second gas path assembly 40, then through the pipeline to the outlet end of the gas storage pipe 24, thereby utilizing the positive pressure carrying principle to "carry out" the sample gas stored in the gas storage pipe 24, forming a mixture of sample gas and carrier gas. This mixture then passes through channel A of solenoid valve 32 and channel B of solenoid valve 31, finally converging into the main channel of solenoid valve 31 and being sent to the detection assembly 50.

[0038] By precisely controlling the power of the gas pump 44, the opening degree of the flow valve 42, and the sample gas carrying time, the amount of sample gas carried out from the gas storage pipe 24 can be controlled, thereby mixing with a constant carrier gas flow to generate calibration gas of different concentrations, enabling a single sample gas source to simulate multiple concentration points for calibration. Example 3

[0039] Based on Example 2, referring to Figures 3 to 5 , specifically: The detection assembly 50 includes a detection chamber 51. The inlet of the detection chamber 51 is directly connected to the main inlet channel of the solenoid valve 31 via a pipeline, for receiving mixed gas or pure carrier gas from the solenoid valve assembly 30. Inside the detection chamber 51, three detection units are sequentially installed along the airflow direction: a CO2 sensor 52, a chromatography column 53, and an H2 / CH4 sensor 54. The CO2 sensor 52 employs, for example, the non-dispersive infrared (NDIR) principle for the detection of trace carbon dioxide (CO2) concentrations. The chromatography column 53 is a separation column packed with specific chromatographic packing material, used to separate hydrogen (H2) and methane (CH4) as the gas flows through it. Because the two gases have different retention times in the column, they can be detected separately. The H2 / CH4 sensor 54 is located after the chromatography column 53 and is used to detect the concentrations of the separated H2 and CH4.

[0040] The outlet of the detection chamber 51 is connected to the outside environment or a waste gas recovery system through a second sample outlet 55, through which the gas after detection is discharged. The housing 10 is also equipped with a display screen 12 and a communication interface 61, both electrically connected to the controller 60. The display screen 12 is used to display information such as flow rate, concentration, calibration curve, and equipment status in real time. The communication interface 61 is a USB interface, which, through an additional Ethernet or wireless module, is used to export the detection data and calibration results processed by the controller 60 to an external computer or network for data management and further analysis.

[0041] The multi-point calibration workflow for this device is as follows: S1: System Preparation and Baseline Calibration. Air pump 44 starts, and a clean airflow continuously purges the detection assembly 50 and its upstream piping for a period of time (e.g., 30-60 seconds). This purifies the entire detection channel, ensuring the stability of the detector response baseline (i.e., zero point). At this time, the detection assembly 50 detects the background signal of clean air, and the controller 60 records this signal as a reference value.

[0042] S2: Sample Gas Injection and Storage. The state of the solenoid valve group 30 is switched via the controller 60. A standard sample gas cylinder of known concentration is connected to the inlet 21. The sample gas flows in under its own pressure or slight pressure, passes through drying and filtration sequentially, fills the gas storage tube 24, and is continuously discharged from the first outlet 25 for a period of time. This completely replaces the residual gas in the gas storage tube 24 and the upstream pipeline with standard sample gas, ensuring that the concentration of the sample gas stored in the gas storage tube 24 is consistent with the nominal value of the standard gas cylinder. After completion, the sample gas source is turned off.

[0043] S3: Multi-point concentration generation and detection. Detection component 50 detects a series of calibration points with different concentrations. Example 4

[0044] Based on Examples 1 to 3, this example will provide examples of the steps for multi-point calibration and detection, as follows: For example, it may be necessary to test 5 concentration points (including zero point).

[0045] 1. Zero-point detection: In fact, repeat the operation of the first stage, introduce pure air, and the detection component 50 measures and records the response value of each component at this time. This point corresponds to the calibration point with a concentration of 0%.

[0046] 2. Low Concentration Point Detection: The controller 60 switches the state of the solenoid valve group 30, controlling the gas pump 44 to operate at lower power, or controlling the flow valve 42 to increase the carrier gas flow rate, while simultaneously controlling the sample gas carrying valve to open for a very short time (e.g., 0.5 seconds). In this way, only a very small amount of sample gas is carried out of the storage tube 24 by the carrier gas, mixing with a large amount of carrier gas to form the first low-concentration mixed gas. This mixed gas is sent to the detection chamber 51, where the CO2 sensor 52 and the H2 / CH4 sensor 54 (after separation by the column chromatography 53) detect its concentration, respectively. The controller 60 records the sensor response signal values. The theoretical concentration value corresponding to this concentration point can be calculated from parameters such as the carrier gas flow rate, sample gas carrying time, and the initial concentration in the storage tube 24, or determined through prior calibration.

[0047] 3. Detection at medium and high concentration points: Keeping the carrier gas conditions constant, gradually increase the duration of a single opening of the sample gas carrying valve (e.g., 1 second, 2 seconds, 4 seconds), or decrease the carrier gas flow rate. Each operation carries out more sample gas, thus generating a mixed gas with gradually increasing concentration. The detection component 50 detects the gas at each concentration, and the controller 60 synchronously records the sensor response value at each concentration point.

[0048] 4. Endpoint (or near-original concentration) detection: In the last cycle, the carrier gas flow rate is controlled to be extremely slow, or the sample gas carrying time is very long, so that the proportion of sample gas in the mixed gas is close to 100%. At this time, the detected concentration is close to the concentration of the original sample gas in the gas storage tube 24.

[0049] S4: Data processing and calibration complete. Once all preset concentration points have been detected, the controller 60 will obtain a set of data pairs: the theoretical concentration (or known concentration) of each analyte (CO2, H2, CH4) at each concentration point, and the actual response signal values ​​(such as voltage, current, peak area) measured by the sensor. The controller 60's built-in algorithm (existing, such as the least squares method) uses this data to perform curve fitting on each sensor, generating a concentration-response calibration curve (usually a linear or polynomial equation), and calculating parameters such as correlation coefficient and sensitivity. The calibration curve and parameters can be displayed on the display screen 12 and output via the communication interface 61. Subsequently, the device can re-enter the cleaning mode to prepare for the next use or actual measurement of the sample. Example 5

[0050] Based on the automated multi-point calibration device constructed in Examples 1 to 3, this example further supplements and refines its design in terms of human-computer interaction, auxiliary control and extended functions to improve the user-friendliness, safety and functionality of the device.

[0051] Reference Figure 1 , Figure 2 and Figure 4The housing 10 has a display screen 12 on its panel. This display screen 12 is preferably a liquid crystal touchscreen (LCD) and is electrically connected to the controller 60. It is used not only for displaying the final results as described in Embodiment 3, but also serves as an important human-machine interface, allowing users to operate the device via the touchscreen. The display screen 12 integrates a graphical user interface with status information, achieving the technical effect of reducing the complexity of device operation and improving the intuitiveness and convenience of user control.

[0052] Reference Figure 1 and Figure 2 A valve group power switch 34 is installed on the housing 10. This switch is connected in series in the power supply circuit of the solenoid valve group 30 (solenoid valve one 31, solenoid valve two 32, and solenoid valve three 33). When long-term maintenance or repair of the device is required, or when manual operation of the air circuit is required, this switch can be physically disconnected to ensure that the solenoid valve group 30 is completely de-energized. This setting provides hardware-level safety isolation, preventing accidental valve operation due to mis-triggering or controller 60 malfunction during maintenance, ensuring the safety of operators, and facilitating operations such as checking the airtightness of the pipeline.

[0053] The communication interface 61 provided on the housing 10 has further expanded functionality. In addition to data export as described in Embodiment 3, this communication interface 61 enables bidirectional communication. The controller 60 can receive remote control commands from a host computer (such as a personal computer or central server) through this interface, enabling remote start-up and control of the device. Furthermore, the device can also send real-time process data, status logs, and alarm information (such as abnormal flow, sensor failure, and pressure exceeding limits) to the host computer. By setting up bidirectional communication, this calibration device can be easily integrated into a laboratory information management system or remote monitoring network, achieving remote monitoring of the calibration process, centralized data management, and traceability, thereby improving the management level of the equipment and the breadth of its application scenarios.

[0054] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated multi-point calibration device for an exhaled gas analyzer, comprising a housing (10), wherein a chamber is formed inside the housing (10), and a calibration mechanism is disposed at the bottom of the housing (10), characterized in that: The calibration mechanism includes a first gas path assembly (20) disposed inside the housing (10), the first gas path assembly (20) being connected to a second gas path assembly (40), and the second gas path assembly (40) being connected to a detection assembly (50); the first gas path assembly (20) is used to store the sample gas to be tested, the second gas path assembly (40) is used to introduce air into the calibration mechanism to carry the sample gas, and to send the mixed gas into the detection assembly (50), the detection assembly (50) being used to detect the composition of the sample gas; The first air path assembly (20) and the second air path assembly (40) are provided with solenoid valve groups (30), which are used to control the air path opening and closing between the first air path assembly (20), the second air path assembly (40) and the detection assembly (50); the housing (10) is also provided with a controller (60), which is electrically connected to the solenoid valve group (30) and the detection assembly (50), and is used to control the opening and closing state of the solenoid valve group (30) and receive and process the detection results from the detection assembly (50).

2. The integrated multi-point calibration device according to claim 1, characterized in that, The solenoid valve assembly (30) includes solenoid valve one (31), solenoid valve two (32), and solenoid valve three (33); solenoid valve two (32) and solenoid valve three (33) are disposed in the air path of the first air path assembly (20), and solenoid valve one (31) is disposed in the air path of the second air path assembly (40); each of solenoid valve one (31), solenoid valve two (32), and solenoid valve three (33) includes a main air intake channel, a channel A connected to the main air intake channel, and a channel B connected to the main air intake channel. Channel A and channel B are respectively connected to external pipes to switch the gas flow direction of the main air intake channel.

3. The integrated multi-point calibration device according to claim 2, characterized in that, The first gas path assembly (20) includes an inlet (21), which is connected to a drying tube (22), which is connected to a filter (23), which is connected to the main air intake channel of the second solenoid valve (32); the channel A of the second solenoid valve (32) is connected to a gas storage tube (24), which is connected to the main air intake channel of the third solenoid valve (33); the channel A of the third solenoid valve (33) is connected to the outside through the first outlet (25).

4. The integrated multi-point calibration device according to claim 3, characterized in that, The second gas path assembly (40) includes a flow meter (41), a flow valve (42), a gas collection bottle (43), an air pump (44), and a drying tank (45); the inlet of the flow meter (41) is connected to the channel B of the solenoid valve (33), the outlet of the flow meter (41), the flow valve (42), the gas collection bottle (43), the air pump (44), and the drying tank (45) are connected in sequence, and the drying tank (45) is connected to the outside.

5. The integrated multi-point calibration device according to claim 4, characterized in that, The main intake channel of the second solenoid valve (32) is connected to the channel B of the third solenoid valve (33), and the channel B of the second solenoid valve (32) is connected to the channel B of the first solenoid valve (31).

6. The integrated multi-point calibration device according to claim 5, characterized in that, The detection component (50) includes a detection chamber (51), the inlet of which is connected to the main air intake channel of the solenoid valve (31); a CO2 sensor (52), a color column spectrum (53) and an H2 / CH4 sensor (54) are arranged sequentially inside the detection chamber (51) along the airflow direction.

7. The integrated multi-point calibration device according to claim 6, characterized in that, The outlet of the detection chamber (51) is connected to the outside through the second sample outlet (55).

8. The integrated multi-point calibration device according to claim 1, characterized in that, A display screen (12) is provided on one side of the housing (10), and the display screen (12) is electrically connected to the controller (60); a communication interface (61) is also provided on one side of the housing (10), and the communication interface (61) is electrically connected to the controller (60) for exporting detection data.

9. The integrated multi-point calibration device according to claim 1, characterized in that, The housing (10) has heat dissipation holes (11).

10. The integrated multi-point calibration device according to claim 2, characterized in that, The housing (10) is provided with a valve group power switch (34), which is used to supply power to the solenoid valve one (31), solenoid valve two (32) and solenoid valve three (33).

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