Lung function test device

Abstract

The present invention discloses a pulmonary function tester detection device, including a detection component and a pressure difference collection component; the pressure difference collection component includes a venturi tube, and a pressure guide hole is provided on the peripheral wall of the venturi tube; and an interface component connected to the pressure guide hole; wherein the interface component is provided with a pressure guide flow channel, and the pressure guide flow channel includes at least one anti-water accumulation portion with a U-shaped cross-section. Through a U-shaped airflow channel, the incoming humid airflow passes through the condensation forming the U-shaped airflow channel, and the water droplets are collected at the bottom of the U-shaped airflow channel, effectively preventing water droplets from entering the detection device circuit, and solving the technical problem of detection error or device damage caused by water droplets entering the interior.

Description

Technical Field

[0001] The present invention relates to a lung function detection device applicable to the technical field of medical devices, and in particular to a lung function detection device using a venturi tube. Background Art

[0002] Vital capacity is closely related to human breathing and lung function. Physiological studies have shown that the organs, systems, tissues, and cells of the human body consume oxygen every moment, and the body can only work normally when there is sufficient oxygen supply. The oxygen supply inside the human body is obtained entirely by the breathing of the lungs. During the breathing process, the lungs not only take in oxygen, but also discharge the carbon dioxide metabolized in the body. We can think of it this way: the lungs are the transit station for gas exchange in the body. The volume of this transit station directly determines the amount of gas exchange in each breath. This is the most intuitive and objective indicator for detecting lung function.

[0003] In the prior art, float-type, rotary-type, and impeller-type spirometers are commonly used to measure human vital capacity. The float-type and rotary-type spirometers use water as the closed surface, and the gas blown in changes the volume through the transfer of liquid, and the human vital capacity is measured by the change in the volume. The impeller-type uses the flow of gas to drive the impeller to rotate, and the speed of the impeller is measured by a photoelectric sensor, so that the human vital capacity is displayed by a secondary instrument. The float-type and rotary-type spirometers are large in size, take a long time to measure, and have poor accuracy; the impeller-type spirometer has been greatly improved, but the friction resistance and rotational inertia of the impeller reduce the measurement accuracy and have a limited service life.

[0004] The Chinese utility model patent with publication number CN2191630Y discloses an electronic spirometer, which belongs to a gas flow measurement instrument. This electronic spirometer mainly adopts an orifice plate throttling device, a solid-state piezoresistive differential pressure sensor, an A / D converter and a single-chip microcomputer system. Although the electronic spirometer has significantly improved sensitivity and accuracy compared with the float type and mechanical spirometer, the resistance loss is large due to the use of the orifice plate throttling device. When the measured flow rate is low, the measurement result also has a large error.

[0005] The Chinese utility model patent with the publication number CN2367251Y discloses a digital electronic spirometer, including a flow measurement device, a pressure difference sensor connected to the pressure difference generating device, and a digital display device connected to the pressure difference sensor. The flow device is composed of a venturi tube, an intake pipe housing and an exhaust pipe. The intake pipe housing is provided with the above-mentioned venturi tube inside, and a pressure taking pipe is provided outside; the downstream end of the intake pipe housing is connected to the exhaust pipe; and the venturi tube is provided with a pressure difference collecting component. Among them, the digital display device composed of a voltage-frequency converter, a single-chip microcomputer and a display is all general prior art. The venturi tube is used as a component for generating a pressure difference. As is known to all, the venturi tube is composed of a tapered tube that gradually contracts and expands. A pressure difference collecting component is arranged on the wall of the venturi tube. The pressure difference collecting component includes: an upstream pressure taking device arranged at the straight pipe part, that is, the upstream end, and a downstream pressure taking device arranged at the junction of the converging pipe and the expanding pipe, that is, the throat of the venturi tube with the smallest diameter. The pressure obtained from the two upstream and downstream pressure takers is connected to the differential pressure sensor by a pipeline, and the pressure signal is converted into a voltage signal by the differential pressure sensor. Then the voltage signal is converted into a digital signal by a voltage-frequency converter (A / D converter). After these signals are processed by a single-chip microcomputer, the measurement results of the vital capacity are displayed digitally on the display screen. In this utility model, the differential pressure collection component set in the venturi tube can only measure the airflow in a single direction, that is, it cannot measure the vital capacity of blowing and inhaling.

[0006] The Chinese invention patent application with publication number CN106441468A discloses a venturi flowmeter capable of realizing bidirectional flow measurement and a measurement method thereof, wherein a front contraction tube and a rear expansion tube with the same structure are arranged between the stabilizing tube 1 and the stabilizing tube 2, a throat is arranged between the front contraction tube and the rear expansion tube, and the front contraction tube and the rear expansion tube are arranged symmetrically along the center between the connecting lines thereof, and the ends with larger end faces are respectively connected to the corresponding stabilizing tube 1 or stabilizing tube 2 as an integral structure, and the ends with smaller end faces are respectively connected to the throat as an integral structure, and the stabilizing tube 1, the stabilizing tube 2 and the throat are all provided with pressure measuring pipes, and the pressure measuring pipes are respectively connected to the corresponding stabilizing tube 1, the stabilizing tube 2 or the throat, and the pressure measuring pipes are connected to a valve group, and the valve group is connected to an intelligent differential pressure transmitter. The flowmeter and the method can be directly used for bidirectional flow measurement of single-phase liquid or single-phase gas in a pipeline, and can accurately measure the bidirectional flow in real time.

[0007] When the above flow meter is used as an air flow meter, especially when the air flow has a certain humidity, water droplets generated by condensation of the wet air flow can easily flow into the interior of the detection device through the pressure measuring tube, causing detection errors or damaging the detection device. Summary of the invention

[0008] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a pulmonary function measuring instrument detection device, which uses a U-shaped air flow channel to allow the incoming humid air flow to pass through the first partition and the second partition constituting the U-shaped air flow channel, so that the condensed water droplets are collected in the water accumulation part at the bottom of the U-shaped air flow channel, forming a U-shaped anti-water accumulation structure that can prevent the water droplets generated by the condensation of the humid air flow from entering the detection component, thereby effectively preventing water droplets from entering the detection device circuit, and solving the technical problem of detection errors or device damage caused by water droplets entering the interior.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A pulmonary function tester detection device includes a detection component and a pressure difference collection component; the pressure difference collection component includes a venturi tube, and a pressure guide hole is provided on the peripheral wall of the venturi tube; and an interface component connected to the pressure guide hole; wherein the interface component is provided with a pressure guide flow channel, and the pressure guide flow channel includes at least one water accumulation prevention portion with a U-shaped cross section. Through a U-shaped airflow channel, the incoming humid airflow passes through the condensation forming the U-shaped airflow channel, and the water droplets are collected at the bottom of the U-shaped airflow channel, effectively preventing water droplets from entering the detection device circuit, and solving the technical problem of detection error or device damage caused by water droplets entering the inside of the detection device.

[0011] Specifically, the pressure-conducting flow channel is arranged in an interface component; the interface component includes an interface body, the interface body is provided with a cavity, the upper end of the cavity is open, and a lower flow channel is provided on one side of the cavity; and a water-blocking cover is arranged in the cavity of the interface body; wherein, a first partition extending upward from the bottom wall of the cavity and adjacent to the lower flow channel is provided in the cavity of the interface body, forming a water accumulation portion in the cavity away from the lower flow channel; the water-blocking cover is provided with a second partition extending downward from the side wall of the water-blocking cover and toward the water accumulation portion, and the free end of the second partition is spaced apart from the bottom wall of the cavity and the first partition.

[0012] Preferably, in order to facilitate the introduction of air flow and make the incoming air flow flow along the guide wall to promote the condensation of humid air flow, the second partition includes a guide wall extending from the side wall of the water-blocking cover toward the top of the water accumulation part and slanting downward; the free end of the first partition is spaced apart from the guide wall.

[0013] Furthermore, in order to prevent the blockage of the air flow channel caused by condensed water droplets, a plurality of ventilation grooves connected to the outside are provided on the inner peripheral wall of the water accumulation part.

[0014] Furthermore, in order to prevent relative rotation between the water-blocking cover and the interface body and maintain the stability of the cross-sectional area of ​​the U-shaped airflow channel, a stop shoulder is provided on the circumferential edge of the upper opening of the cavity of the interface body, and a corresponding stop groove is provided on the upper edge of the water-blocking cover.

[0015] Furthermore, in order to ensure the stable flow of the airflow through the U-shaped airflow channel and to make the cross-section of the airflow channel continuously uniform, the positions of the anti-rotation shoulder and the anti-rotation groove are arranged so that the first partition plate and the second partition plate are parallel to each other.

[0016] Preferably, in order to maintain the sealed connection between the plug connector and the interface assembly and facilitate the loading and unloading of the venturi tube, an elastic cover is provided on the upper edge of the water-blocking cover, and a crack adapted to the plug connector is provided in the middle of the elastic cover.

[0017] The above and other objects, features and advantages of the present invention will be further clarified through the following specific embodiments and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the main cross-section structure of the present invention;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the pressure difference collection assembly in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the head cover in the present invention;

[0022] Figure 5 It is a side view of the bite direction of the present invention;

[0023] Figure 6 It is a schematic diagram of the clamping structure of the Venturi tube and the button in the present invention;

[0024] Figure 7 for Figure 6 Magnified view at B in the middle;

[0025] Figure 8 for Figure 3 Middle AA section view;

[0026] Fig. 9 It is a structural schematic diagram of the interface component in the present invention;

[0027] Fig.10 It is a schematic cross-sectional structure diagram of the interface component in the present invention;

[0028] Fig.11 It is a structural schematic diagram of the interface body in the present invention;

[0029] Fig.12 It is a schematic diagram of the structure of the water-proof cover in the present invention;

[0030] Fig.13 It is a cross-sectional view of the interface assembly at the anti-water accumulation structure in the present invention;

[0031] In the figure: 10, differential pressure collection assembly; 11, interface body; 110, cavity; 111, water accumulation part; 112, lower flow channel; 113, anti-rotation shoulder; 114, first baffle; 115, ventilation groove; 12, water-proof cover; 120, guide wall; 121, second baffle; 122, anti-rotation groove; 123, side opening; 13, elastic cover; 130, crack; 14, shell assembly; 140, head cover; 141, positioning groove; 14 2. Plug-in hole; 143. Card connector; 144. Front and rear shells; 15. Venturi tube; 150. Contraction section; 151. Throat; 152. Diffusion section; 153. Pressure-conducting hole; 154. Plug-in connector; 155. Positioning foot; 156. Hook; 16. Release button; 160. Hook foot; 17. Elastic element; 18. Interface assembly; 19. Screen; 20. Detection assembly; 30. Bite; 40. Three-way connector; 41. Air pipe. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0033] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as limiting the specific scope of protection of the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See attached picture Figure 1~Figure 4 According to an embodiment of the present invention, a pulmonary function tester detection device includes a detection component 20 arranged in a shell component 14 and a pressure difference collection component 10 connected to the pressure difference sensor on the detection component 20 through an air pipe 41. The pressure difference collection component 10 includes a venturi tube 15 arranged on a head cover 140 of the shell component 14 and an interface component 18 connected to a pressure guide hole 153 on the peripheral wall of the venturi tube 15. The venturi tube 15 is respectively provided with a contraction section 150, a throat 151 and a diffusion section 152; the pressure guide hole 153 is respectively arranged at the beginning of the contraction section 150, the throat 151, and the end of the diffusion section 152. The principle of the flow meter using the venturi tube 15 should be well known to those skilled in the art, and will not be repeated here.

[0037] See also Figure 5~Figure 8 A plug connector 154 extending outward from the pressure-conducting hole 153 is provided on the outer peripheral wall of the venturi tube 15. Positioning pins 155 extending in the same direction as the plug connector 154 are provided on the peripheral wall of the venturi tube 15 between the contraction section 150 and the throat 151, and between the throat 151 and the diffusion section 152. A circular arc groove matching the diameter of the venturi tube 15 is provided on the upper part of the head cover 140, and a positioning groove 141 and a plug hole 142 corresponding to the positions of the plug connector 154 and the positioning pins 155 are provided. An interface assembly 18 is connected below the plug hole 142 on the head cover 140, and the venturi tube 15 is connected to the head cover 140 of the shell assembly 14 through the positioning foot 155 and the positioning groove 141, and the plug connector 154 of the venturi tube 15 is correspondingly inserted into the plug hole 142 and sealed in the upper port of the interface assembly 18, and the pressure is transmitted to the detection assembly 20 through the air flow channel in the interface assembly 18.

[0038] Two hooks 156 are provided at the lower end of the positioning foot 155 provided on the venturi tube 15. A notch extending upward is provided between the two hooks 156 of each positioning foot 155. The notch allows the two hooks 156 to have a certain elasticity. The outside of the positioning groove 141 is formed on the clamping seat 143 below the head cover 140. Slideways that penetrate the lower part of the positioning groove 141 are provided on both sides of the clamping seat 143. A release button 16 with a hook foot 160 is provided in the slideway. An elastic element 17 is provided between the release button 16 and the clamping seat 143. The hook foot 160 of the release button 16 extends into the positioning groove 141 and forms an elastic clamping structure corresponding to the hook 156 on the positioning foot 155 inserted into the positioning groove 141. In this embodiment, the hook 156 protrudes toward the inside of the notch, the hook foot 160 turns toward the hook 156 in an L shape, and the elastic element 17 makes the hook foot 160 move outward. When the positioning foot 155 is inserted into the positioning groove 141, the guide surface on the head end of the hook 156 makes the hook foot 160 in the positioning groove 141 overcome the elastic force of the elastic element 17 and move toward the middle of the positioning groove 141, so that the hook 156 passes over the hook foot 160 and enters the bottom of the hook foot 160. The hook foot 160 turns toward the top of the hook 156 in an L shape in the positioning groove 141, thereby locking the venturi tube 15 on the head cover 140. Those skilled in the art should understand that the hook 156 and the hook foot 160 are provided to lock the venturi tube 15 on the head cover 140. In addition to the present embodiment, the elastic snap-fit ​​structure should be well known to those skilled in the art and may have various deformations, such as changing the protruding direction of the hook 156; or providing a slot adapted to the hook 156 on the inner wall of the positioning groove 141, and using the hook foot 160 only as a push rod to release the snap-fit ​​of the positioning foot, and the like.

[0039] See also Figure 3 , Figure 9~Figure 12The interface assembly 18 includes an interface body 11, a water-blocking cover 12 clamped in the cavity 110 of the interface body 11, and an elastic cover 13 arranged on the upper opening of the water-blocking cover 12. A lower flow channel 112 extending and opening to the lower end is provided on one side of the interface body 11. A pipe joint structure is formed on the outside of the lower flow channel 112 for connecting with the air pipe 41, and one end in the cavity 110 is lower than the upper opening of the interface body 11. A first partition 114 extending upward from the bottom wall of the cavity 110 and adjacent to the lower flow channel 112 is provided in the cavity 110 of the interface body 11. The first partition 114 separates a water accumulation portion 111 in the cavity 110. The first baffle 114 is flush with the opening of the lower flow channel 112 in the cavity 110. The first baffle 114 is higher than the opening of the lower flow channel 112 in the cavity 110 on both sides of the opening of the lower flow channel 112 in the cavity 110, but still lower than the upper opening of the interface body 11, so that a sinking structure is formed at the opening of the lower flow channel 112 in the cavity 110, and the sinking is provided with a notch facing the water accumulation part 111. An annular platform is provided around the upper opening of the interface body 11, and an annular shoulder is provided at the upper end of the water barrier cover 12, which overlaps the annular platform of the upper opening of the interface body 11. A guide wall 120 extending downwardly is provided at a position slightly lower than the upper opening of the water barrier cover 12, and a side opening 123 is provided on the side wall of the water barrier cover 12 in the extending direction of the guide wall 120. The guide wall 120 continues to extend axially downward at the side opening 123 to form a second partition 121. When the water-blocking cover 12 is set at the upper opening of the interface body 11, its second partition 121 extends into the water accumulation part 111 in the cavity 110, and is spaced apart from the peripheral wall and bottom wall of the cavity 110 at the water accumulation part 111. The lower wall surface of the guide wall 120 of the water-blocking cover 12 is spaced apart from the top of the first partition 114. The water accumulation part 111 of the interface body 11 forms a U-shaped airflow channel under the partitioning action of the second partition 121 of the water-blocking cover 12, and the water accumulation part 111 formed at the bottom of the U-shape forms an anti-water accumulation part of the interface assembly 18. Through a U-shaped air flow channel, the incoming humid air flow passes through the first partition 114 and the second partition 121 that constitute the U-shaped air flow channel, so that the condensed water droplets are collected in the water accumulation part 111 at the bottom of the U-shaped air flow channel, forming a U-shaped anti-water accumulation structure that can prevent water droplets generated by the condensation of the humid air flow from entering the detection component 20, thereby effectively preventing water droplets from entering the detection device circuit, and solving the technical problem of detection error or device damage caused by water droplets entering the circuit.

[0040] Two anti-rotation grooves 122 are provided on the outer periphery of the annular shoulder of the water-blocking cover 12, and anti-rotation shoulders 113 corresponding to the anti-rotation grooves 122 are provided on the annular platform of the interface body 11. The provision of the anti-rotation shoulders 113 and the anti-rotation grooves 122 limits the rotation of the water-blocking cover 12 in the cavity 110 of the interface body 11, keeps the second baffle 121 parallel to the first baffle 114, and maintains the stability of the cross-sectional area of ​​the airflow channel.

[0041] See also Fig.11 , Fig.12 and Fig.13 In order to prevent the condensed water droplets from blocking the U-shaped airflow channel, three ventilation grooves 115 are provided on the inner peripheral wall of the cavity 110 of the interface body 11. The ventilation grooves 115 extend downward from the upper opening of the interface body 11 and are spaced apart from the bottom wall of the water accumulation portion 111. The downward extension of the ventilation grooves 115 ends slightly beyond the extension distance of the second partition 121 in the cavity 110 of the interface body 11.

[0042] In order to maintain the sealed connection between the plug connector 154 and the interface assembly 18 and facilitate the assembly and disassembly of the venturi tube 15 , a split 130 adapted to the plug connector is provided in the middle of the elastic cover 13 .

[0043] The opening of the venturi tube 15 at one end near the contraction section 150 is provided with a mouthpiece 30 for the tester to blow and inhale. A mesh screen 19 is provided at the connection between the mouthpiece 30 and the venturi tube 15 to prevent the entry of foreign matter. The airflow blown in by the tester from the mouthpiece 30 passes through the mesh screen 19, passes through the contraction section 150 and the pressure guide hole 153 of the throat 151, enters the interface assembly 18, and reaches the pressure difference sensor of the detection assembly 20 through the three-way joint 40 and the air pipe 41, and obtains the pressure difference data of the airflow entering from the pressure guide hole 153 of the contraction section 150 and the throat 151 respectively. Similarly, when the airflow inhaled by the tester passes through the pressure guide hole 153 of the diffusion section 152 and the throat 151, and reaches the pressure difference sensor of the detection assembly 20 through the three-way joint 40 and the air pipe 41, the pressure difference data of the airflow entering from the pressure guide hole 153 of the diffusion section 152 and the throat 151 respectively is obtained.

[0044] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A pulmonary function tester detection device, comprising a detection component and a pressure difference acquisition component; characterized in that: The pressure difference collection component includes a venturi tube, a pressure-conducting hole is provided on the peripheral wall of the venturi tube; and an interface component connected to the pressure-conducting hole; wherein the interface component is provided with a pressure-conducting flow channel, and the pressure-conducting flow channel includes at least one water-proof portion with a U-shaped cross-section; the interface component includes an interface body and a water-blocking cover clamped in the cavity of the interface body, the interface body is provided with a lower flow channel, and a first partition extending upward from the bottom wall of the cavity and adjacent to the lower channel is provided in the cavity of the interface body, and the first partition separates a water-proof portion in the cavity; a guide wall is provided on the water-blocking cover, and the guide wall is provided at the lower flow channel and the upper part of the first partition, and the guide wall continues to extend downward at the opening of the water-blocking cover to form a second partition, and the second partition is spaced apart from the peripheral wall and bottom of the cavity at the water-proof portion; the water-proof portion of the interface body is separated by the second partition to form a U-shaped airflow channel, and the water-proof portion is formed by forming a water-proof portion at the bottom of the U-shape.

2. The pulmonary function tester detection device according to claim 1, characterized in that: The pressure-conducting flow channel is arranged in an interface component; the interface component includes an interface body, the interface body is provided with a cavity, the upper end of the cavity is open, and a lower flow channel is provided on one side of the cavity; and a water-blocking cover is arranged in the cavity of the interface body; wherein, a first partition extending upward from the bottom wall of the cavity and adjacent to the lower flow channel is provided in the cavity of the interface body, and a water accumulation portion is formed in the cavity away from the lower flow channel; the water-blocking cover is provided with a second partition extending downward from the side wall of the water-blocking cover and toward the water accumulation portion, and the free end of the second partition is spaced apart from the bottom wall of the cavity and the first partition.

3. The pulmonary function tester detection device according to claim 2, characterized in that: The second partition includes a guide wall extending from the side wall of the water-blocking cover toward the top of the water accumulation part and obliquely downward; the free end of the first partition is spaced apart from the guide wall.

4. The pulmonary function tester detection device according to claim 2 or 3, characterized in that: A plurality of ventilation grooves communicating with the outside are arranged on the inner peripheral wall of the water accumulation part.

5. The pulmonary function tester detection device according to claim 2 or 3, characterized in that: A rotation-stopping shoulder is provided on the peripheral edge of the upper opening of the cavity of the interface body, and a corresponding rotation-stopping groove is provided on the upper peripheral edge of the water-blocking cover.

6. The pulmonary function tester detection device according to claim 4, characterized in that: A rotation-stopping shoulder is provided on the peripheral edge of the upper opening of the cavity of the interface body, and a corresponding rotation-stopping groove is provided on the upper peripheral edge of the water-blocking cover.

7. The pulmonary function tester detection device according to claim 5, characterized in that: The positions of the anti-rotation shoulder and the anti-rotation groove are arranged so that the first partition plate and the second partition plate are parallel to each other.

8. The pulmonary function tester detection device according to claim 6, characterized in that: The positions of the anti-rotation shoulder and the anti-rotation groove are arranged so that the first partition plate and the second partition plate are parallel to each other.

9. The pulmonary function tester detection device according to claim 2 or 3, characterized in that: An elastic cover is arranged on the upper edge of the water-proof cover, a plug connector extending outward from the pressure-conducting hole is arranged on the outer peripheral wall of the venturi tube, and a crack matching with the plug connector is arranged in the middle of the elastic cover.

10. The pulmonary function tester detection device according to claim 4, characterized in that: An elastic cover is arranged on the upper edge of the water-proof cover, a plug connector extending outward from the pressure-conducting hole is arranged on the outer peripheral wall of the venturi tube, and a crack matching with the plug connector is arranged in the middle of the elastic cover.

11. The pulmonary function tester detection device according to claim 1, characterized in that: A mouthpiece is provided on the opening at one end of the venturi tube for the tester to blow and inhale, and a mesh screen is provided at the connection between the mouthpiece and the venturi tube.

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