阅读说明：本技术 一种新型呼出气体采样装置 (Novel expired gas sampling device ) 是由 武传伟 张崇军 牛小民 高锋 于 2019-09-04 设计创作，主要内容包括：本发明提供一种新型呼出气体采样装置,包括导流管和设置在所述导流管出口处的抽气风扇,所述导流管的一侧管壁上设置有导流负压板和采样口,所述采样口位于所述导流负压板和所述导流管的出气口之间,所述采样口直径小于所述导流负压板垂直于进气气流方向的投影长度小于所述导流管直径。本发明通过设置导流负压板,使呼出气流在导流负压板后形成一个不含水珠等杂质的负压区,解决了现有装置中存在的采集的呼出气体带有杂质以及吹气压力变化较大时干扰采气量的问题；通过在管道出气口处设置抽气风扇,解决了采样管道内残留气体的问题,具有设计科学、结构简单、操作方便和分析结果精度高等优点。(The invention provides a novel exhaled gas sampling device which comprises a flow guide pipe and an air exhaust fan arranged at the outlet of the flow guide pipe, wherein a flow guide negative pressure plate and a sampling port are arranged on the pipe wall on one side of the flow guide pipe, the sampling port is positioned between the flow guide negative pressure plate and the air outlet of the flow guide pipe, and the diameter of the sampling port is smaller than the diameter of the flow guide pipe, wherein the projection length of the flow guide negative pressure plate perpendicular to the air inlet flow direction is smaller than the diameter of the flow guide pipe. According to the invention, the flow guide negative pressure plate is arranged, so that the exhaled air flow forms a negative pressure region without impurities such as water drops and the like behind the flow guide negative pressure plate, and the problems that the collected exhaled air has impurities and the air collection amount is interfered when the change of the air blowing pressure is large in the conventional device are solved; through set up air exhaust fan at pipeline gas outlet department, solved the problem of residual gas in the sampling pipeline, have design science, simple structure, convenient operation and analysis result precision advantage such as high.)

1. The utility model provides a novel expired gas sampling device, includes the honeycomb duct, its characterized in that: be provided with water conservancy diversion negative pressure plate and sample connection on one side pipe wall of honeycomb duct, the sample connection is located water conservancy diversion negative pressure plate with between the gas outlet of honeycomb duct, just the sample connection diameter is less than the projection length of water conservancy diversion negative pressure plate perpendicular to air current direction of admitting air is less than the honeycomb duct diameter.

2. The novel exhaled breath sampling device according to claim 1, wherein: the air outlet of the flow guide pipe is also provided with a square groove, and an air exhaust fan is embedded in the square groove.

3. A novel exhaled breath sampling device according to claim 1 or 2, characterized in that: the honeycomb duct is L type honeycomb duct, the water conservancy diversion negative pressure plate with the sampling port sets up on the outside pipe wall of the gas outlet top of L type honeycomb duct.

4. The novel exhaled breath sampling device according to claim 3, wherein: the flow guide negative pressure plate comprises a parallel baffle with one end fixed on the outer side pipe wall above the air outlet of the L-shaped flow guide pipe and a baffle straight arm fixedly connected with the other end of the parallel baffle, the baffle straight arm is perpendicular to the air inlet flow direction, and the parallel baffle is parallel to the air inlet flow direction.

5. The novel exhaled breath sampling device according to claim 4, wherein: the length ratio of the length of the parallel baffle to the diameter of the air outlet of the L-shaped guide pipe is 1/3.

6. The novel exhaled breath sampling device according to claim 3, wherein: the flow guide negative pressure plate comprises a baffle straight arm, one end of the baffle straight arm is fixed on the outer side pipe wall above the air outlet of the L-shaped flow guide pipe, and the baffle straight arm is perpendicular to the air inlet flow direction.

7. The novel exhaled breath sampling apparatus according to any one of claims 4 to 6, wherein: and the extension line of the sampling port is perpendicular to the baffle straight arm space.

8. A novel exhaled breath sampling device according to claim 1 or 2, characterized in that: the honeycomb duct is straight honeycomb duct, the water conservancy diversion negative pressure board with the sampling port sets up the pipe wall upper portion of straight honeycomb duct.

9. The novel exhaled breath sampling device according to claim 8, wherein: the flow guide negative pressure plate comprises a baffle straight arm with one end fixed to the upper part of the pipe wall of the straight flow guide pipe and a parallel baffle fixedly connected with the other end of the baffle straight arm, the baffle straight arm is perpendicular to the air inlet flow direction, and the parallel baffle is parallel to the air inlet flow direction.

10. A novel exhaled breath sampling apparatus according to claim 4 or 5 or 6 or 9, characterized in that: the length ratio of the length of the baffle straight arm to the diameter of the draft tube is 2/3.

Technical Field

The invention relates to the field of gas sampling, in particular to a novel exhaled gas sampling device.

Background

The existing exhaled gas sampling device directly extracts the exhaled gas of a population from an exhaled gas flow guide pipe, so that the collected gas is inevitably provided with water drops or other particle impurities; meanwhile, the pressure at the sampling port changes along with the change of the blowing pressure to influence the sampling amount at the sampling port; and after sampling is finished each time, residual gas in the pipeline is not cleaned, and the gas directly enters a next sampling period, so that interference factors such as impurity water drops of exhaled gas, blowing pressure change, gas in the pipeline at the last time and the like can be superposed to the next sampling process, interference is caused to a gas analysis system, and an analysis result is inaccurate.

In order to solve the above problems, people are always seeking an ideal technical solution.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a novel exhaled gas sampling device which is simple in structure, free of impurities and residues and accurate in analysis.

In order to achieve the purpose, the invention adopts the technical scheme that: a novel exhaled gas sampling device comprises a flow guide pipe, wherein a flow guide negative pressure plate and a sampling port are arranged on the pipe wall of one side of the flow guide pipe, and the diameter of the sampling port is smaller than the projection length of the flow guide negative pressure plate perpendicular to the direction of an air inlet flow and is smaller than the diameter of the flow guide pipe; the air outlet of the flow guide pipe is also provided with a square groove, and an air exhaust fan is embedded in the square groove.

Based on the above, the honeycomb duct is L type honeycomb duct, the water conservancy diversion negative pressure plate with the sample connection sets up on the outside pipe wall of the gas outlet top of L type honeycomb duct.

Based on the above, the water conservancy diversion negative pressure plate includes that one end is fixed parallel baffle on the outside pipe wall of the gas outlet top of L type honeycomb duct and with the straight arm of baffle of parallel baffle other end rigid coupling, the straight arm of baffle is perpendicular with the air current direction of admitting air, parallel baffle is parallel with the air current direction of admitting air.

Based on the above, the flow guide negative pressure plate comprises a baffle straight arm with one end fixed on the outer pipe wall above the air outlet of the L-shaped flow guide pipe, and the baffle straight arm is perpendicular to the air inlet flow direction.

Based on the above, the honeycomb duct is straight honeycomb duct, the water conservancy diversion negative pressure board with the sampling port sets up the pipe wall upper portion of straight honeycomb duct.

Based on the above, the diversion negative pressure plate comprises a baffle straight arm with one end fixed on the upper part of the pipe wall of the straight diversion pipe and a parallel baffle fixedly connected with the other end of the baffle straight arm, the baffle straight arm is perpendicular to the air inlet flow direction, and the parallel baffle is parallel to the air inlet flow direction.

Compared with the prior art, the device has outstanding substantive characteristics and remarkable progress, and particularly, the device enables the exhaled air flow to form a negative pressure region without impurities such as water drops and the like after the negative pressure plate is arranged, so that the problem that the collected exhaled air has impurities in the existing device is solved; the problem of interference on gas production when the blowing pressure changes greatly is solved by arranging the positions of the sampling port and the flow guide negative pressure plate and improving the structure of the flow guide negative pressure plate; the air exhaust fan is arranged at the air outlet of the flow guide pipe, and the fan promotes the air circulation in the flow guide pipe after a sampling period is finished, so that the problem of residual air in a sampling pipeline is solved, and interference factors such as exhaled air impurity water drops, blowing pressure change and air in the pipe at the last time are prevented from being superposed to the next sampling process; the purity of the exhaled gas is improved by the three means, the accuracy of an analysis result is guaranteed, the problem which puzzles people all the time in the prior art is effectively solved, and the exhaled gas analyzing device has the advantages of being scientific in design, simple in structure, convenient to operate, high in purity of the exhaled gas and the like.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of embodiment 2 of the present invention.

Fig. 5 is a bottom view of embodiment 2 of the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of embodiment 3 of the present invention.

Fig. 7 is a schematic cross-sectional structure diagram of embodiment 4 of the present invention.

In the figure, 1. L-shaped draft tube; 2. a sampling port; 3. an air inlet; 4. an air outlet; 5. parallel baffles; 6. a baffle straight arm; 7. a square groove; 8. an air extraction fan; 9. a straight honeycomb duct.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.