A stable flow condensation low residual gas path and detection cavity structure for multi-sensor exhaled breath detection

Abstract

The application discloses a stable flow and condensation removing low-residual gas path and detection cavity structure for multi-sensor exhaled air detection, and belongs to the technical field of gas path structure of exhaled air detection equipment, and comprises, which are sequentially and communicatively arranged, a blowing interface assembly, an import channel, a stable flow buffer assembly, a liquid blocking and condensation removing assembly, a detection cavity assembly, and an exhaust and cleaning recovery assembly. Through the combined arrangement of the stable flow cavity, the liquid blocking plate, the separation cavity, the main flow channel and the cleaning recovery branch, the blowing pulsation, the liquid drop impact, the condensation interference and the sample residue can be reduced, the action consistency of the sample at multiple sensor installation positions can be improved, and the stable flow and condensation removing low-residual gas path and detection cavity structure is suitable for multi-sensor exhaled air detection equipment.

Description

Technical Field

[0001] This invention relates to the technical fields of exhaled breath detection equipment, sample gas path pretreatment, and multi-sensor detection chamber structure, and particularly to a stable flow decondensation low residual gas path and detection chamber structure for multi-sensor exhaled breath detection. Background Technology

[0002] Human exhaled breath samples are characterized by high humidity, pulsation, complex composition, and significant individual differences. For multi-sensor exhaled breath detection devices, directly introducing exhaled breath into the sensor area can easily lead to problems such as unstable flow rate, droplet and aerosol impact, local condensation, uneven sample distribution, and sample residue, which in turn affect the consistency and repeatability of responses from multiple sensors.

[0003] Some existing exhaled breath detection devices only have a simple tubing or ordinary cavity after the exhalation port, lacking designs for stable flow, liquid blocking, low residue and rapid recovery to address the characteristics of high humidity, pulsation and multi-channel detection of exhaled breath. This makes it easy for residue from the previous test to affect the next test, and it is difficult to keep the action conditions of the sample consistent at different sensor locations.

[0004] Therefore, a gas path and detection chamber structure that can balance flow stabilization and buffering, liquid blocking / condensation removal, detection space optimization, and emptying recovery is needed to apply effective exhaled air samples to the multi-sensor array in a more stable and less disruptive manner. Summary of the Invention

[0005] The purpose of this invention is to provide a stable flow, decondensation, and low residual gas path and detection chamber structure for multi-sensor exhaled breath detection, in order to solve the problems of unstable exhaled breath sample introduction, significant interference from high humidity condensation, uneven flow field in the detection chamber, large impact of sample residue, and low emptying and recovery efficiency in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a stable flow, decondensation, and low residual gas path and detection chamber structure for multi-sensor exhaled breath detection, comprising a blowing interface assembly 1, an inlet channel 2, a stable flow buffer assembly 3, a liquid-blocking / decondensation assembly 4, a detection chamber assembly 5, and an exhaust and cleaning / restoration assembly 6 arranged sequentially. The blowing interface assembly 1 is used to receive human exhaled breath samples; the inlet channel 2 is used to introduce the sample into the device; the stable flow buffer assembly 3 is used to reduce pulsation fluctuations during the exhaled breath introduction process; the liquid-blocking / decondensation assembly 4 is used to reduce the probability of droplets, aerosols, or condensate entering the detection chamber assembly 5; the detection chamber assembly 5 is provided with multiple sensor mounting positions 19 and a main flow channel 18 for sample flow; the exhaust and cleaning / restoration assembly 6 is used to vent and clean the detection chamber assembly 5 and its connected gas paths after detection is completed.

[0007] Preferably, the air blowing interface assembly 1 includes a mouthpiece 7, an interface seat 8, and a replaceable isolator 9 located between the mouthpiece 7 and the interface seat 8. The replaceable isolator 9 is used to confine the easily contaminated parts to the front detachable area to balance hygiene isolation and maintenance convenience.

[0008] Preferably, the flow stabilizing buffer assembly 3 includes a flow stabilizing cavity 10, a flow stabilizing baffle 11, and a throttling channel 12. After being buffered by the flow stabilizing cavity 10, the exhaled gas sample passes through the flow stabilizing baffle 11 and the throttling channel 12 into the subsequent gas path, so as to reduce flow fluctuations and local turbulence during the sample introduction process.

[0009] Preferably, the liquid-blocking / condensation-removing assembly 4 includes a liquid-blocking plate 13, a separation chamber 14, a droplet collection area 15, and a hydrophobic element 16. Exhaled air samples change direction under the action of the liquid-blocking plate 13 and enter the separation chamber 14. Droplets and aerosols are separated in the separation chamber 14 and accumulate in the droplet collection area 15. The hydrophobic element 16 is positioned close to the main airflow path to prevent droplets from re-entering the main airflow path.

[0010] Preferably, the detection chamber assembly 5 includes a detection chamber housing 17, a main flow channel 18 located within the detection chamber housing 17, a flow guide 21 arranged along the main flow channel 18, and a lateral exposure area 20 communicating with the main flow channel 18. The lateral exposure area 20 is provided with multiple sensor mounting positions 19. The main flow channel 18 and the lateral exposure area 20 communicate to form a detection space, allowing multiple sensors to contact the sample under relatively uniform flow field conditions.

[0011] Preferably, the exhaust and cleaning recovery assembly 6 includes an exhaust channel 22, an exhaust valve 23, a cleaning branch 24, and an auxiliary air pump 25. The auxiliary air pump 25 is connected to the detection chamber assembly 5 through the cleaning branch 24 and is used to vent and clean the detection chamber assembly 5 and its connected air passages after the detection is completed.

[0012] Preferably, the inner wall of the gas path in contact with the sample is made of a low-adsorption material or forms a low-adsorption surface layer, and the flow paths of the inlet channel 2, the flow stabilizing buffer assembly 3 and the detection chamber assembly 5 are reduced to minimize stagnation space and blind end structures that are separated from the main flow path, so as to reduce sample residue.

[0013] In this invention, detection space optimization refers to reducing the stagnation space that is separated from the main sample flow path by combining the main channel 18, the lateral exposure area 20 and the guide 21; low residue refers to reducing the retention of the sample in the gas path and detection chamber by using low adsorption materials, reducing blind end structures and designing the emptying and cleaning path.

[0014] Compared with existing technologies, the present invention has the following advantages: First, the flow stabilization buffer component weakens the blowing pulsation and improves the sample introduction stability; second, the liquid blocking / condensation removal component reduces the direct impact of droplets, aerosols, and local condensation on the detection chamber; third, the combination of the main flow channel, lateral exposure area, and guide component improves the consistency of sample contact conditions at multiple sensors; fourth, the coordinated design of the exhaust channel, exhaust valve, cleaning branch, and auxiliary air pump shortens the post-detection evacuation recovery time; fifth, the easily contaminated front end is replaceable, balancing hygiene and maintainability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the steady flow decondensation low residual gas path and detection chamber of the present invention.

[0016] Figure 2 This is a cross-sectional schematic diagram of the detection cavity assembly of the present invention.

[0017] Figure 3 This is a schematic diagram of the current stabilization buffer component of the present invention.

[0018] Figure 4 This is a schematic diagram of the liquid-blocking / condensation-removing component of the present invention.

[0019] Figure 5 This is a schematic diagram of the exhaust and cleaning recovery path of the present invention.

[0020] Figure 6 This is a schematic diagram of the internal integrated structure of the exhaled breath detection device of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0022] Implementation method one: such as Figure 1 As shown, the stable flow, decondensation, and low residual gas path and detection chamber structure of this embodiment includes an air blowing interface assembly 1, an inlet channel 2, a stable flow buffer assembly 3, a liquid blocking / decondensation assembly 4, a detection chamber assembly 5, and an exhaust and cleaning recovery assembly 6. Human exhaled air samples enter the interface seat 8 through the mouthpiece 7 and then enter the stable flow buffer assembly 3 through the inlet channel 2. After being buffered in the stable flow chamber 10, the sample enters the liquid blocking / decondensation assembly 4 through the stable flow baffle 11 and the throttling channel 12. Subsequently, the sample after liquid blocking / decondensation enters the detection chamber assembly 5 and contacts multiple sensors. After detection, the sample is emptied or cleaned and restored by the exhaust and cleaning recovery assembly 6.

[0023] Implementation Method Two: (e.g.) Figure 2As shown, the detection chamber assembly 5 includes a detection chamber housing 17, a main flow channel 18, multiple sensor mounting positions 19, a lateral exposure area 20, and a flow guide 21. The main flow channel 18 forms the main sample flow path, and the flow guide 21 improves the uniformity of the flow field. The multiple sensor mounting positions 19 are located within the lateral exposure area 20, allowing the main airflow to act more evenly on the multiple sensors as it flows through the main flow channel 18. The combined arrangement of the main flow channel 18 and the lateral exposure area 20 reduces stagnation space while balancing the sample coverage area and recovery speed.

[0024] Implementation Method 3: For example Figure 3 As shown, the flow stabilization buffer assembly 3 includes a flow stabilization chamber 10, a flow stabilization baffle 11, and a throttling channel 12. After the exhaled gas sample enters from the inlet side, it is first buffered in the flow stabilization chamber 10, and then passes through the flow stabilization baffle 11 and the throttling channel 12 into the subsequent gas path. The flow stabilization baffle 11 can be configured as a single layer, multiple layers, or a perforated structure, and the throttling channel 12 can be designed with a cross-sectional area according to the target flow range of the equipment to reduce pulsation and local turbulence during sample introduction.

[0025] Implementation Method Four: (e.g.) Figure 4 As shown, the liquid-blocking / condensation-removing assembly 4 includes a liquid-blocking plate 13, a separation chamber 14, a droplet collection area 15, and a hydrophobic element 16. After the high-humidity exhaled air sample enters the liquid-blocking / condensation-removing assembly 4, some droplets change direction under the action of the liquid-blocking plate 13 and enter the separation chamber 14. Larger droplets and condensate eventually converge in the droplet collection area 15, while the gas portion continues to flow towards the detection chamber assembly 5. The hydrophobic element 16 can be positioned near the main ventilation path to prevent droplets from re-entering the main airflow path.

[0026] Implementation Method 5: (e.g.) Figure 5 As shown, the exhaust and cleaning recovery assembly 6 includes an exhaust channel 22, an exhaust valve 23, a cleaning branch 24, and an auxiliary air pump 25. After the test is completed, the main control unit controls the exhaust valve 23 to switch to the venting state and drives the auxiliary air pump 25 to perform evacuation and / or cleaning recovery on the test chamber assembly 5 through the cleaning branch 24. If necessary, background air or cleaning gas can also be introduced into the cleaning branch 24 to further shorten the waiting time between two adjacent tests.

[0027] Implementation method six: such as Figure 6As shown, the multi-sensor exhaled breath detection device includes a main control unit 28, a main sensor array 26, environmental sensors and / or auxiliary sensors 27, and the aforementioned stable flow, decondensation, low residue air path and detection chamber structure. The main sensor array 26 is arranged near the detection chamber assembly 5, and the environmental sensors and / or auxiliary sensors 27 can be arranged in corresponding positions inside the device to collect auxiliary parameters such as temperature, humidity, pressure, and flow rate. The main control unit 28 is used to control the sample introduction, detection, and recovery process. Through the above structural arrangement, an integrated air path with stable flow, liquid blocking, low residue, and rapid recovery can be formed in the multi-sensor exhaled breath detection device.

[0028] As an optional embodiment, the volume of the flow stabilizing chamber 10 can be from 5 mL to 100 mL; the angle of inclination of the baffle plate 13 relative to the mainstream direction of the sample flow can be from 30° to 75°; the number of sensor mounting positions 19 in the detection chamber assembly 5 can be from 2 to 12; the inner wall material in contact with the sample can be polytetrafluoroethylene, perfluoroalkoxy resin, polyetheretherketone, medical-grade silicone, stainless steel, or a material that forms a hydrophobic, low-adsorption surface layer. The above parameters can be adjusted according to the equipment volume, target flow range, and number of sensors.

Claims

1. A stable flow, decondensation, and low residual gas path and detection chamber structure for multi-sensor exhaled breath detection, characterized in that, It includes a blowing interface assembly, an inlet channel, a flow stabilizing buffer assembly, a liquid blocking / condensation removal assembly, a detection chamber assembly, and an exhaust and cleaning recovery assembly arranged in sequence; the detection chamber assembly is provided with a main flow channel and multiple sensor mounting positions; the exhaust and cleaning recovery assembly is connected to the detection chamber assembly and is used to vent and clean the detection chamber assembly and its connected air passages after the detection is completed.

2. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The air blowing interface assembly includes a mouthpiece, an interface seat, and a replaceable isolator located between the mouthpiece and the interface seat. The replaceable isolator is used to confine the easily contaminated part to the front removable area.

3. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The flow stabilization buffer assembly includes a flow stabilization chamber, a flow stabilization baffle, and a throttling channel. After being buffered by the flow stabilization chamber, the exhaled air sample passes through the flow stabilization baffle and the throttling channel into the subsequent air path.

4. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The liquid-blocking / coagulation-removing assembly includes a liquid-blocking plate, a separation chamber, and a droplet collection area. The liquid-blocking plate is disposed in the sample flow path so that the sample airflow changes direction before entering the separation chamber, and the droplets enter the droplet collection area under inertial action.

5. The stable flow decondensing low residual gas path and detection chamber structure according to claim 4, characterized in that, The liquid blocking / condensation removal assembly also includes a hydrophobic element disposed in the separation chamber. The hydrophobic element is disposed near the main airflow passage to prevent droplets from re-entering the main airflow passage.

6. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The detection chamber assembly includes a detection chamber housing, a main channel located within the detection chamber housing, a guide member arranged along the main channel, and a lateral exposure area communicating with the main channel. The lateral exposure area is provided with multiple sensor mounting positions.

7. The stable flow decondensing low residual gas path and detection chamber structure according to claim 6, characterized in that, The main flow channel is connected to the lateral exposure area to form a detection space. The flow guide is set along the main flow direction to guide the sample airflow through multiple sensor mounting positions in sequence.

8. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The exhaust and cleaning recovery assembly includes an exhaust channel, an exhaust valve, a cleaning branch, and an auxiliary air pump. The auxiliary air pump is connected to the detection chamber assembly through the cleaning branch and is used to vent and clean the detection chamber assembly and its connected air path after the detection is completed.

9. The stable flow decondensing low residual gas path and detection chamber structure according to claim 1, characterized in that, The inner wall of the gas path in contact with the sample is made of a low-adsorption material or forms a low-adsorption surface layer, and the flow paths of the inlet channel, the flow stabilization buffer assembly, and the detection cavity assembly have reduced stagnation space and blind end structures that are separated from the main flow path.

10. A multi-sensor exhaled breath detection device, characterized in that, It includes a main control unit, a main detection sensor array, an environmental sensor and / or an auxiliary sensor, and a stable flow decondensation low residual gas path and detection chamber structure as described in any one of claims 1 to 9. The main control unit is used to control the sample to be introduced into the detection chamber assembly through the blowing interface assembly, the inlet channel, the stable flow buffer assembly, and the liquid blocking / decondensation assembly, and to control the exhaust and cleaning recovery assembly to perform venting and / or cleaning recovery after the detection is completed.

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