A directional pressure relief, dead volume rejection and effective sample switching sampling assembly for infrared gas detection apparatus

Abstract

The present application relates to exhaled gas detection sampling technical field, specifically for a kind of directional pressure relief, dead cavity elimination and effective sample switching sampling assembly for infrared gas detection equipment.The sampling assembly includes sequentially connected disposable mouth assembly, front end anti-flying droplet flow guide section, hose air guide section, equipment end fixed interface seat and equipment end transition protection cavity;The equipment end transition protection cavity is communicated with main sampling channel, bypass channel and equipment internal gas circuit respectively, and is equipped with switching element inside.Initial exhalation stage, switching element makes main sampling channel close and bypass channel conduct, to discharge pre-stage exhalation;After continuous exhalation reaches set condition, switching element makes bypass channel close and main sampling channel conduct, to send post-stage exhalation into infrared gas detection equipment.The scheme can realize initial exhalation bypass and post-stage exhalation introduction at the front end of equipment, to complete dead cavity gas elimination and improve effective sample collection stability.

Description

Technical Field

[0001] This invention relates to the field of exhaled gas detection sampling components, and in particular to a directional depressurization, dead space rejection, and effective sample switching sampling component for infrared gas detection equipment. Background Technology

[0002] When infrared gas detection equipment detects breath samples, it typically guides exhaled gas into the internal gas path of the device through a mouthpiece assembly, air delivery tubing, and device interface for subsequent infrared detection. In existing front-end sampling structures, a common practice is to directly connect a disposable mouthpiece to a tubing, or to use a simple flow guide to continuously deliver all exhaled gas into the device. This type of structure has the following shortcomings in practical applications: First, the initial exhalation phase often contains a significant amount of dead space gas and unstable impulsive airflow; directly delivering this into the infrared detection device reduces the proportion of valid samples. Second, when the initial and subsequent exhalations share the same path without a front-end switching structure, it is difficult to remove invalid samples at the sampling front end. Third, if the device lacks transition protection and directional bypass structures, droplets, liquid droplets, and initially unstable exhaled gas are more likely to directly enter the internal gas path, affecting detection consistency and device maintenance. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, this invention provides a directional depressurization, dead space elimination, and effective sample switching sampling component for an infrared gas detection device, which enables the side-by-side elimination of the first part of the exhalation and the effective introduction of the second part of the exhalation through structural linkage at the front end of the device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A sampling assembly for directional pressure relief, dead space rejection, and effective sample switching in an infrared gas detection device includes a disposable mouthpiece, a front-end droplet-proof guide section, a flexible air guide section, a device-end fixed interface seat, and a device-end transition protection chamber connected in sequence. The device-end transition protection chamber is connected to a main sampling channel, a side-channel, and the internal gas path of the device. A switching element is installed inside the device-end transition protection chamber. During the initial exhalation phase, the switching element closes the main sampling channel and opens the side-channel, allowing the initial exhalation to be discharged through the side-channel and side-outlet. After the pressure, flow rate, or their combined effect from continuous exhalation reaches a set threshold, the switching element switches to close the side-channel and open the main sampling channel, allowing the subsequent exhalation to be delivered into the infrared gas detection device through the internal gas path. The switching element is used to switch the flow path between the main sampling channel and the side-channel according to the exhalation state, prioritizing the side-channel discharge of initial exhalation and introducing the subsequent exhalation into the internal gas path of the device after reaching the set conditions.

[0005] Furthermore, the disposable mouth assembly has a guide mouth shape that is larger at the front and smaller at the back, and a baffle component and / or grid component are provided in the front anti-droplet guide section to improve mouth alignment and reduce the possibility of droplets and liquids being transported backward.

[0006] Furthermore, the air guide section of the hose is connected to the fixed interface seat at the end of the equipment through a connection structure with directional limiting and sealing fit to ensure consistent assembly direction and improve airtightness.

[0007] Furthermore, the transition protection cavity at the equipment end is located between the fixed interface seat at the equipment end and the internal air passage of the equipment. Its internal flow path is deflected relative to the axis of the hose air guide section, and the conduction status of the main sampling channel and the bypass channel are controlled by the switching component respectively.

[0008] Compared with the prior art, the present invention has at least the following beneficial effects: 1. By installing a switching component in the transition protection chamber at the device end, the front and back exhalations can be structurally diverted at the front end of the device, thereby increasing the proportion of effective samples entering the infrared gas detection device.

[0009] 2. By prioritizing the exhalation of the initial exhalation through the side-channel, dead space air and unstable impulsive airflow can be eliminated at the structural level, reducing the probability of invalid samples entering the device.

[0010] 3. Through the combination structure of disposable mouth assembly, replaceable hose gas guide section, equipment end fixed interface seat and equipment end transition protection cavity, it takes into account hygiene requirements, usage distance requirements, interface orientation assembly requirements and front end protection requirements, and is suitable for the engineering application of infrared gas detection equipment.

[0011] 4. By separating the side-channel and side-outlet from the main sampling channel and the internal air path of the device, the risk of the exhaled air rewinding into the internal air path of the device can be reduced, thus improving sampling stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the sampling component of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure during the initial exhalation stage of the present invention.

[0014] Figure 3 This is a schematic diagram of the continuous expiratory sampling stage of the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0016] like Figure 1As shown, this embodiment provides a sampling component for directional pressure relief, dead space rejection, and effective sample switching in an infrared gas detection device. It includes a disposable mouth assembly 1, a front-end anti-droplet guide section 2, a flexible air guide section 3, a device-end fixed interface seat 4, and a device-end transition protection chamber 5, connected in sequence. The device-end transition protection chamber 5 contains a main sampling channel 6, a side channel 7, and a switching element 8, which are respectively connected to the internal gas path 9 and the side outlet 10 of the device. The disposable mouth assembly 1 is used to contact or align with the user's mouth. The front-end anti-droplet guide section 2 is used to guide the flow and block droplets. The flexible air guide section 3 provides a flexible connection between the user and the device. The device-end fixed interface seat 4 enables directional and sealed connection between the flexible air guide section 3 and the device end. The device-end transition protection chamber 5 completes flow path switching and transition protection at the front end of the device.

[0017] The disposable mouthpiece 1 is preferably a guide mouth shape that is larger at the front and smaller at the back, so that the user can direct exhalation to the rear. The front anti-droplet guide section 2 may be equipped with a baffle member, a grid member, or an equivalent flow-blocking structure to block larger droplet particles and reduce the direct entry of droplets into the hose guide section 3 along the mainstream direction. The hose guide section 3 is preferably a replaceable flexible air guide tube to meet the needs of usage distance and maintenance replacement.

[0018] The equipment-end fixed interface seat 4 is located at the front end of the equipment body and is used to form a detachable connection with the hose air guide section 3. The equipment-end fixed interface seat 4 may be provided with a non-circular insertion part, a limiting part, and a sealing part, thereby limiting the insertion direction and insertion depth of the hose air guide section 3, and ensuring the airtightness and directional consistency after assembly.

[0019] The equipment-end transition protection chamber 5 is located between the equipment-end fixed interface seat 4 and the internal air passage 9 of the equipment. A switching element 8 is installed inside, connecting the main sampling channel 6 and the bypass channel 7. The bypass channel 7 extends to the bypass outlet 10, and the main sampling channel 6 connects to the internal air passage 9 of the equipment. Preferably, the flow path within the equipment-end transition protection chamber 5 is deflected relative to the axis of the hose guide section 3 to reduce the direct impact of incoming air on the internal air passage 9 of the equipment.

[0020] like Figure 2 As shown, during the initial exhalation phase when the user begins to exhale, the switching element 8 is in the first position. At this time, the side channel 7 is unobstructed, the main sampling channel 6 is closed, and the switching element 8 blocks the main sampling channel 6 while opening the side channel 7. Therefore, the initial exhaled gas, after entering the transition protection chamber 5 at the device end, does not enter the internal air passage 9 of the device, but is discharged through the side channel 7 and the side outlet 10. Since the initial exhaled gas typically contains a large amount of dead space gas and an unstable impulsive airflow, this stage achieves the structural removal of invalid samples from the initial stage.

[0021] As the user continues to exhale, once the pressure, flow rate, or both of these generated by the continuous exhalation reach a set threshold, the switch 8 switches to the second position. For example... Figure 3 As shown, in the second position, the side channel 7 is closed, and the main sampling channel 6 is open. The switching element 8 closes the side channel 7 and opens the main sampling channel 6. Thus, the more stable exhalation in the latter part enters the internal gas path 9 of the device via the main sampling channel 6 and is further sent to the internal detection path of the infrared gas detection device. Because the side channel 7 is closed at this stage, continuous exhalation no longer exits through the side outlet 10, but instead preferentially enters the internal gas path 9 of the device via the main sampling channel 6.

[0022] In a preferred embodiment, the switching element 8 is a rotatable or swingable valve-type component, one end of which is installed in the transition protection cavity 5 at the device end via a rotating shaft, pin, or equivalent rotating connection structure. In the first position, the switching element 8 blocks the main sampling channel 6 and opens the side channel 7; in the second position, it blocks the side channel 7 and opens the main sampling channel 6. The action of the switching element 8 can be directly driven by the pneumatic force generated by continuous exhalation, or indirectly driven by a driving component linked to expiratory pressure or flow rate, as long as it can achieve the desired effect. Figure 2 and Figure 3 Simply switch between the two flow path states shown.

[0023] In this invention, the bypass channel 7 and the main sampling channel 6 are preferably located on different sides of the transition protection cavity 5 at the device end, and the discharge direction of the bypass outlet 10 is deviated from the entry direction of the internal gas path 9 of the device. This reduces the probability of bypass gas recirculating into the internal gas path 9 of the device. At the same time, the transition protection cavity 5 at the device end can also serve as a front-end buffer and protection space to reduce the risk of droplets or liquid droplets directly entering the internal gas path 9 of the device.

[0024] In practical use, the user first assembles the disposable mouthpiece 1 with the front anti-droplet guide section 2 and the hose air guide section 3, and then inserts the hose air guide section 3 into the device end fixing interface seat 4 in the predetermined direction. When the user begins to exhale, the first part of the exhalation is discharged through the side channel 7 and the side outlet 10 under the action of the switching element 8; when the user maintains continuous exhalation and reaches the set switching condition, the switching element 8 is activated, allowing the second part of the exhalation to enter the internal air passage 9 of the device through the main sampling channel 6. After the test is completed, the disposable mouthpiece 1 can be discarded, and the hose air guide section 3 and the device end fixing interface seat 4 can be cleaned, replaced or disinfected according to maintenance requirements.

[0025] This invention is not limited to the embodiments described above. Any equivalent substitutions or modifications made by those skilled in the art to the shape of the disposable mouthpiece 1, the flow guiding form of the front anti-droplet guide section 2, the specific connection method of the switching component 8, and the limiting and sealing structure of the device-end fixed interface seat 4, without departing from the concept of this invention, shall fall within the protection scope of this invention.

Claims

1. A sampling component for directional pressure relief, dead space rejection, and effective sample switching in an infrared gas detection device, characterized in that, The device includes a disposable mouthpiece, a front-end droplet-proof guide section, a hose air guide section, a device-end fixed interface seat, and a device-end transition protection chamber connected in sequence. The device-end transition protection chamber is connected to the main sampling channel, the side-exhaust channel, and the internal air passage of the device, and is equipped with a switching device that can be switched between a first position and a second position. When the switching device is in the first position, it closes the main sampling channel and opens the side-exhaust channel so that the initial exhalation is discharged through the side-exhaust channel and the side-exhaust outlet. The switching element switches to the second position after the pressure, flow rate, or their combined effect generated by continuous exhalation reaches a set threshold, thereby closing the side channel and opening the main sampling channel, so that the subsequent exhalation is sent into the infrared gas detection device through the internal air path of the device.

2. The sampling component according to claim 1, characterized in that, The disposable mouthpiece has a guide mouth shape that is larger at the front and smaller at the back, and its outlet is positioned opposite to the inlet of the front anti-droplet guide section so that exhaled air is introduced into the front anti-droplet guide section along the axial direction of the component.

3. The sampling component according to claim 1, characterized in that, The front-end anti-droplet guide section is equipped with a baffle component and / or a grid component to block droplets or liquid droplets in exhaled air before introducing them into the hose guide section.

4. The sampling component according to claim 1, characterized in that, The air guide section of the hose is a replaceable flexible air guide tube, and it is connected to the fixed interface seat of the equipment end through a connection structure with directional limiting and sealing fit.

5. The sampling component according to claim 1, characterized in that, The device end fixed interface seat is provided with a non-circular plug part, a limiting part that cooperates with the non-circular plug part, and a sealing part, so as to limit the insertion direction and insertion depth of the hose air guide section and form a sealed fit.

6. The sampling component according to claim 1, characterized in that, The transition protection cavity at the device end is located between the fixed interface seat at the device end and the internal air passage of the device, and its internal flow path is deflected relative to the axis of the hose air guide section, so that the exhaled air from the hose air guide section changes its flow direction before entering the internal air passage of the device.

7. The sampling component according to claim 1, characterized in that, The side-exhaust channel and the main sampling channel are located on different sides of the transition protection cavity at the device end, and the discharge direction of the side-exhaust outlet is different from the inlet direction of the internal air passage of the device.

8. The sampling component according to claim 1, characterized in that, The switching component is a rotatable or swingable valve plate type component, which closes the main sampling channel and opens the side channel in a first position, and closes the side channel and opens the main sampling channel in a second position.

9. The sampling component according to claim 1, characterized in that, The switching condition of the switching element is that the pressure, flow rate, or both of the continuous exhalation reach a set threshold, so that short exhalations that do not reach the set threshold are discharged only through the side channel without connecting the main sampling channel.

10. The sampling component according to claim 1, characterized in that, The disposable mouthpiece is a single-use component, and the air guide section of the hose and the fixed interface seat at the device end are replaceable and / or maintainable components.

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