Device for detecting concentration of hydrogen and methane in exhaled gas and correction method

Abstract

The invention discloses a device for detecting the concentration of hydrogen and methane in exhaled gas and a correction method, and relates to the technical field of gas analysis. Comprising a shell, a waste discharge cavity and an air inlet cavity are formed in the shell, an air inlet pipe is fixedly connected to the shell, a waste storage barrel is fixedly connected to the interior of the waste discharge cavity, and the air inlet pipe is communicated with the lower side of the waste storage barrel; the waste discharge pressing plate is connected into the waste storage barrel in a sliding mode, a waste discharge sealing ring is fixedly connected between the waste discharge pressing plate and the waste storage barrel, and the air inlet pipe is fixedly connected and communicated with a connecting pipe; and the transfer cylinder is fixedly connected into the air inlet cavity, and an oxygen sensor and a detection sensor are installed in the shell. The waste storage cylinder is used for collecting and isolating the front section of gas flowing in the shell, the rear section of gas flowing in the shell serves as sample gas to be detected, the influence of air in the gas guide pipe and the shell and dissecting dead space gas on the concentration of hydrogen and methane in the sample gas is reduced, and then the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas analysis, and in particular to a device for detecting the concentration of hydrogen and methane in exhaled gas and a calibration method. Background Art

[0002] Exhaled gas testing is a non-invasive medical diagnostic method that evaluates health status or detects specific diseases by analyzing the composition of exhaled gas. A gas analyzer is used to detect the concentrations of hydrogen and methane in the exhaled gas, which can be used to diagnose small intestinal bacterial overgrowth, lactose intolerance, and pancreatic exocrine function. When testing exhaled gas, a disposable filter tip is connected to the gas analyzer using an airway, and the patient blows air into the gas analyzer. The exhaled gas that enters the gas analyzer is used as the sample gas to pass through the sensor inside the gas analyzer, thereby detecting the concentrations of hydrogen and methane in the sample gas. Since the airway and the gas analyzer are initially At the same time, the exhaled gas is composed of alveolar gas (alveolar gas is the gas after gas exchange in the alveoli) and anatomical dead space gas (anatomical dead space gas refers to the gas in the respiratory tract from the nasal cavity to the terminal bronchioles. This part of the gas does not participate in the gas exchange between the alveoli and the blood). Hydrogen and methane enter the exhaled gas through the alveoli. Therefore, the air inside the airway and the gas analyzer and the existence of anatomical dead space gas will reduce the concentration of hydrogen and methane in the sample gas. In this way, after the sample gas passes through the gas analyzer, the sensor in the gas analyzer measures the average value of the hydrogen and methane concentrations in the sample gas, which is lower than the actual situation, resulting in low final detection accuracy. Summary of the invention

[0003] The present invention provides a device for detecting the concentration of hydrogen and methane in exhaled gas and a correction method thereof, so as to overcome the disadvantage that, when performing exhaled gas detection, the concentration of hydrogen and methane in the sample gas is reduced due to the presence of air in an airway and a gas analyzer and anatomical dead space gas, resulting in low detection accuracy.

[0004] The technical solution of the present invention is: a device for detecting the concentration of hydrogen and methane in exhaled gas, comprising: A shell, wherein a waste discharge chamber and an air intake chamber are arranged in the shell, an air intake pipe is fixedly connected to the shell, a waste storage cylinder is fixedly connected to the waste discharge chamber, and the air intake pipe is communicated with the lower side of the waste storage cylinder; A waste discharge pressure plate is slidably connected in the waste storage cylinder, a waste discharge sealing ring is fixedly connected between the waste discharge pressure plate and the waste storage cylinder, and a connecting pipe is fixedly connected and communicated with the air inlet pipe; A rotating cylinder is fixedly connected in the air inlet cavity, and its lower side is connected to the connecting pipe. A detection tube connected to the outside is fixedly connected to the lower side of the rotating cylinder, and an oxygen sensor and a detection sensor are installed in the shell. The detection tube is connected to the oxygen sensor and the detection sensor in sequence. A switching component is arranged in the connecting pipe and is used to control the connection state between the air intake pipe and the connecting pipe.

[0005] Furthermore, the switching component includes: A fixing ring, fixedly connected to a side of the connecting pipe close to the air inlet pipe; A fixing frame, fixedly connected to the connecting pipe, the fixing frame being fixedly connected to a sealing disk in contact with the fixing ring via a tension spring, the fixing frame and the sealing disk being respectively located on two sides of the fixing ring, and the fixing frame being located on a side of the sealing disk close to the air inlet pipe; A conversion plate is sealingly and slidably connected in the waste storage cylinder, the waste storage cylinder is provided with a waste discharge hole, the conversion plate is used to sequentially block the waste discharge hole and the connection between the air intake pipe and the waste storage cylinder, and the shell is provided with a first through hole connecting the waste discharge chamber with the outside.

[0006] Furthermore, the sealing disk is magnetic, and the fixing ring is made of soft magnetic material.

[0007] Furthermore, it also includes: The mounting frame is fixedly connected to the upper side of the waste storage barrel. The mounting frame is rotatably connected to a threaded knob. The threaded knob is threadedly connected to an extrusion piece that is slidably connected to the mounting frame. The extrusion piece is used to limit the range of movement of the waste discharge pressure plate.

[0008] Furthermore, it also includes: A transfer pressure plate is slidably connected in the transfer cylinder, the transfer pressure plate is fixedly connected to and communicated with a pressure relief valve, and a transfer sealing ring is fixedly connected between the transfer pressure plate and the transfer cylinder; A sealing member is sealingly and slidably connected in the rotating cylinder, the sealing member is fixedly connected to the sealing disk, and the sealing member is used to block the connection between the rotating cylinder and the detection tube.

[0009] Furthermore, it also includes: A recoil cylinder is fixedly connected in the air inlet cavity, an air extraction pipe is arranged at the lower side of the recoil cylinder, an air extraction one-way valve is fixedly connected in the air extraction pipe, and the housing is provided with a second through hole connecting the air inlet cavity with the outside; An exhaust pipe is fixedly connected to and communicated with the lower side of the recoil cylinder and is communicated with the connecting pipe near the intake pipe. The connecting point between the exhaust pipe and the connecting pipe is located on the side of the sealing disk away from the fixing frame. An exhaust check valve is fixedly connected in the exhaust pipe. A recoil plate is slidably connected in the recoil cylinder, and a bellows is fixedly connected between the recoil plate and the recoil cylinder; A trigger assembly is arranged on the recoil cylinder and is used to control the movement sequence of the recoil pressure plate and the transfer pressure plate.

[0010] Furthermore, the first through hole on the shell and the second through hole on the shell are respectively located on two sides of the shell.

[0011] Furthermore, the trigger component includes: A support member, fixedly connected to the transfer platen, for pressing the recoil platen; A connecting frame is fixedly connected to a side of the recoil cylinder close to the intermediate cylinder. The connecting frame is rotatably connected to a Z-shaped frame, and a torsion spring is fixedly connected between the two. The Z-shaped frame is used to limit the recoil pressure plate, and the intermediate pressure plate is used to squeeze the Z-shaped frame.

[0012] Furthermore, it also includes: A connecting ring is fixedly connected to the transfer sealing ring. The connecting ring is fixedly connected with a magnetic sheet. The magnetic sheet is used to seal the connection between the transfer cylinder and the detection tube. The transfer cylinder is made of soft magnetic material.

[0013] A calibration method for detecting the concentration of hydrogen and methane in exhaled gas, using the above-mentioned device for detecting the concentration of hydrogen and methane in exhaled gas, comprises the following steps: Step 1: Use the oxygen sensor to measure the oxygen concentration in the sample gas and record it; Step 2: Calculate the percentage of alveolar gas in the entire sample gas based on the oxygen concentration in the sample gas and the known oxygen concentration in the air; Step 3: Use the detection sensor to measure the concentration of hydrogen and methane, and combine it with the alveolar gas percentage to calculate the corrected hydrogen and methane concentration values; Step 4: Take the corrected hydrogen and methane concentration values ​​as the final values ​​and upload them to the instrument for subsequent processing.

[0014] Compared with the prior art, the present invention has the following advantages: the present invention utilizes a waste storage cylinder to collect and isolate the first section of gas flowing in the shell, and uses the second section of gas flowing in the shell as sample gas for detection, thereby reducing the influence of the air in the air duct and the shell and the anatomical dead space gas on the concentration of hydrogen and methane in the sample gas, thereby improving the detection accuracy.

[0015] The height of the extrusion piece is used to limit the movable range of the exhaust pressure plate, thereby controlling the maximum volume of the exhaust chamber, so that the residual air and anatomical dead space gas can fully enter the exhaust chamber, which can not only reduce the content of anatomical dead space gas in the sample gas, but also ensure the volume of the sample gas.

[0016] The sample gas is stored in a transfer cylinder. After the patient stops exhaling, the gravity of the transfer pressure plate is used to release the sample gas in the transfer cylinder at a uniform speed, and the concentrations of hydrogen and methane are detected through detection sensors. In this way, when different patients are tested, the sample gas always passes through the detection sensor at a uniform speed, thereby improving the accuracy of the test results.

[0017] The recoil cylinder is used to store air, and after the test, the air in the recoil cylinder is released to allow the air to flow through the connecting pipe, transfer chamber and detection tube and "flush" them, thereby reducing the impact of residual sample gas in the connecting pipe, transfer chamber and detection tube on subsequent tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the waste storage cylinder, the transfer cylinder and the recoil cylinder of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the air intake pipe, the exhaust pressure plate and the threaded knob of the present invention; Figure 4 It is a three-dimensional structural cross-sectional view of the air intake pipe, the waste storage tube and the connecting pipe of the present invention; Figure 5 It is a three-dimensional structural cross-sectional view of the air intake pipe, the exhaust pressure plate and the connecting pipe of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the transfer cylinder, the transfer pressure plate and the recoil cylinder of the present invention; Figure 7 It is a three-dimensional structural cross-sectional view of the connecting pipe and the exhaust pipe of the present invention; Figure 8 It is a three-dimensional structural cross-sectional view of the transfer plate and the back-punch plate of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting ring and the magnetic sheet of the present invention.

[0019] Marked in the figure: 1-shell, 101-waste discharge chamber, 102-air inlet chamber, 2-inlet pipe, 3-waste storage cylinder, 4-waste discharge pressure plate, 5-waste discharge sealing ring, 6-connecting pipe, 7-transfer cylinder, 8-detection tube, 9-oxygen sensor, 10-detection sensor, 11-fixing ring, 12-sealing disk, 13-fixing frame, 14-conversion plate, 141-waste discharge hole, 15-mounting frame, 16-threaded knob, 17-extrusion piece, 18-transfer pressure plate, 181-pressure relief valve, 19-transfer sealing ring, 20-seal, 21-recoil cylinder, 211-exhaust pipe, 22-exhaust check valve, 23-exhaust pipe, 24-exhaust check valve, 25-recoil pressure plate, 26-bellows, 27-support, 28-connecting frame, 29-Z-shaped frame, 30-connecting ring, 31-magnetic sheet. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] A device for detecting the concentration of hydrogen and methane in exhaled gas, please refer to Figure 1-Figure 5 , comprising: a shell 1, a waste discharge chamber 101 and an air intake chamber 102 are arranged in the shell 1, an air intake pipe 2 is fixedly connected to the shell 1, a waste storage cylinder 3 is fixedly connected to the waste discharge chamber 101, and the air intake pipe 2 is communicated with the lower side of the waste storage cylinder 3; a waste discharge pressure plate 4 is slidably connected in the waste storage cylinder 3, a waste discharge sealing ring 5 is fixedly connected between the waste discharge pressure plate 4 and the waste storage cylinder 3, and the air intake pipe 2 is fixedly connected and communicated with a connecting pipe 6; a transfer cylinder 7 is fixedly connected in the air intake chamber 102, and its lower side is communicated with the connecting pipe 6, and the lower side of the transfer cylinder 7 is fixedly connected and communicated with a detection tube 8 communicated with the outside, an oxygen sensor 9 and a detection sensor 10 are installed in the shell 1, and the detection tube 8 is communicated with the oxygen sensor 9 and the detection sensor 10 in turn; a switching component is arranged in the connecting pipe 6, and is used to control the connection state between the air intake pipe 2 and the connecting pipe 6.

[0022] In the above scheme, it is intended to solve the problem that when performing exhaled gas detection, the concentration of hydrogen and methane in the sample gas is affected by the presence of air in the airway and gas analyzer and anatomical dead space gas, resulting in low detection accuracy; this scheme uses the waste storage cylinder 3 to collect and isolate the first section of gas flowing in the shell 1, and uses the second section of gas flowing in the shell 1 as the sample gas for detection, thereby reducing the influence of the air in the airway and shell 1 and the anatomical dead space gas on the concentration of hydrogen and methane in the sample gas, thereby improving the detection accuracy; the air inlet pipe 2 is connected to the disposable filter tip through the airway pipe (not shown in the figure); the waste discharge sealing ring 5 is made of a plastic film (similar to a plastic wrap and ground film), initially, the waste discharge sealing ring 5 is in a "stacked" state, and the waste discharge sealing ring 5 is cylindrical in the expanded state; the waste storage cylinder 3, the waste discharge pressure plate 4 and the waste discharge sealing ring 5 together constitute an exhaust gas chamber (the gas entering the exhaust gas chamber will be referred to as exhaust gas later, which contains residual air and anatomical dead space gas); the detection sensor 10 includes an electrochemical sensor for detecting the concentration of hydrogen and methane. In the process of the gas flowing through the detection sensor 10, the detection sensor 10 can detect and record the concentration of hydrogen and methane respectively; a touch screen is provided on the shell 1, which allows medical staff to register information on the patient to be detected on the one hand, and is used to display the detection value on the other hand.

[0023] Please refer to Figure 4 and Figure 5The switching assembly includes: a fixed ring 11, fixedly connected to the side of the connecting pipe 6 close to the intake pipe 2; a fixed frame 13, fixedly connected to the connecting pipe 6, the fixed frame 13 is fixedly connected to a sealing disk 12 in contact with the fixed ring 11 through a tension spring, the fixed frame 13 and the sealing disk 12 are respectively located on both sides of the fixed ring 11, and the fixed frame 13 is located on the side of the sealing disk 12 close to the intake pipe 2; a conversion plate 14, sealingly slidably connected to the waste storage cylinder 3, the waste storage cylinder 3 is provided with a waste discharge hole 141, the conversion plate 14 is used to sequentially block the waste discharge hole 141 and the connection between the intake pipe 2 and the waste storage cylinder 3, the housing 1 is provided with a first through hole connecting the waste discharge chamber 101 with the outside; the sealing disk 12 is magnetic, and the fixed ring 11 is a soft magnetic material.

[0024] In the above scheme, the purpose is to use the air pressure in the intake pipe 2 to push the sealing disk 12 to move, so as to detect the volume of the exhaust gas in the exhaust gas chamber. When the exhaust gas volume is greater than the volume of the residual air and the anatomical dead space gas, the flow path of the subsequent sample gas is changed; initially, the conversion plate 14 blocks the exhaust hole 141, and the sealing disk 12 is magnetically adsorbed on the left side of the fixing ring 11. At this time, the intake pipe 2 is only connected to the exhaust gas chamber; the magnetic attraction between the fixing ring 11 and the sealing disk 12 plays a role in limiting the sealing disk 12, so that after the volume of the exhaust gas chamber reaches the maximum, the sealing disk 12 will not move immediately, but will first accumulate pressure in the intake pipe 2 and the exhaust gas chamber until the air pressure in the intake pipe 2 and the exhaust gas chamber is able to push the sealing disk 12 to move, and the sealing disk 12 can directly drive the conversion plate 14 to move left to the extreme position, so that the conversion plate 14 blocks the connection between the intake pipe 2 and the waste storage cylinder 3.

[0025] Please refer to Figure 2-Figure 4 , and also includes: a mounting frame 15, which is fixedly connected to the upper side of the waste storage barrel 3, and the mounting frame 15 is rotatably connected to a threaded knob 16, and the threaded knob 16 is threadedly connected to an extrusion member 17 that is slidably connected to the mounting frame 15, and the extrusion member 17 is used to limit the range of movement of the waste discharge pressure plate 4.

[0026] In the above scheme, in order to adapt to the different volumes of anatomical dead space gas in the exhaled gas of children and adults, the height of the extrusion piece 17 is used to limit the movable range of the exhaust pressure plate 4, thereby controlling the maximum volume of the exhaust chamber, so that the residual air and the anatomical dead space gas can fully enter the exhaust chamber, which can not only reduce the content of anatomical dead space gas in the sample gas, but also ensure the volume of the sample gas; initially, the extrusion piece 17 is located at the highest point (that is, the state of the extrusion piece 17 in the accompanying drawing). If it is necessary to test the child (reduce the maximum volume of the exhaust chamber), turn the threaded knob 16, and the threaded knob 16 moves the extrusion piece 17 downward through the threaded transmission, so that the highest point that the exhaust pressure plate 4 can move is lowered, thereby adapting to the situation that the volume of the anatomical dead space gas of children is smaller than that of adults.

[0027] Please refer to Figure 4-Figure 6 and Figure 8, and also includes: a transfer pressure plate 18, which is slidably connected in the transfer cylinder 7, the transfer pressure plate 18 is fixedly connected and communicated with a pressure relief valve 181, and a transfer sealing ring 19 is fixedly connected between the transfer pressure plate 18 and the transfer cylinder 7; a sealing member 20, which is sealingly slidably connected in the transfer cylinder 7, the sealing member 20 is fixedly connected to the sealing disk 12, and the sealing member 20 is used to block the connection between the transfer cylinder 7 and the detection tube 8.

[0028] The above scheme aims to solve the problem that when performing exhaled gas detection, different patients have different exhalation speeds during the detection process. If the sample gas flow rate entering the gas analyzer is too fast, the sensor will not be able to respond to the gas to be detected in time, resulting in the sensor detection reading being lower than the actual situation. If the sample gas flow rate entering the gas analyzer is slow, the sensor signal will be weak (for example, when using an electrochemical sensor to detect oxygen in the exhaled gas, the slow gas flow rate will reduce the oxygen molecules participating in the electrode reaction and the generated current signal will be weak), resulting in errors in the detection results. In this scheme, the transfer cylinder 7 is used to store the sample gas. After the patient stops exhaling, the gravity of the transfer pressure plate 18 is used to release the sample gas in the transfer cylinder 7 at a uniform speed, and the hydrogen and methane concentrations are detected by the detection sensor 10. In this way, when different patients are tested, the sample gas always passes through the detection sensor 10 at a uniform speed, thereby improving the accuracy of the detection results.

[0029] The transfer cylinder 7, the transfer pressure plate 18 and the transfer sealing ring 19 together constitute a transfer chamber, which is used to temporarily store the sample gas. The pressure relief valve 181 is used to discharge the excess sample gas after the sample gas volume in the transfer chamber reaches the maximum. In this way, during multiple tests, the volume of the sample gas in the transfer chamber can be kept consistent, thereby improving the reliability of the test results. The material of the transfer sealing ring 19 is the same as that of the waste sealing ring 5.

[0030] The working principle of the above scheme is as follows: when performing exhaled gas testing, the medical staff connects the disposable filter and the airway to the airway 2, and turns the threaded knob 16 according to the patient's age and body shape to adjust the maximum volume of the waste gas chamber. The patient then takes a deep breath and blows the gas into the airway through the disposable filter. The anatomical dead space gas that first enters the airway drives the residual air in the airway and the airway 2 to flow and enter the waste gas chamber. The volume of the gas in the waste gas chamber increases, and the waste discharge pressure plate 4 is pushed upward, so that the volume of the waste gas chamber increases, and gradually The waste gas sealing ring 5 is stretched, and finally the waste gas pressure plate 4 contacts the extrusion piece 17, and the volume of the waste gas chamber cannot continue to increase. At this point, most of the air in the air intake pipe 2 and the airway and the anatomical dead space gas enter the waste gas chamber. As the patient continues to blow, the air pressure in the waste gas chamber and the air intake pipe 2 increases together, until the squeezing force of the above-mentioned air pressure on the sealing disk 12 is sufficient to overcome the magnetic attraction between the sealing disk 12 and the fixing ring 11 and the tension of the adjacent tension spring on the sealing disk 12. The gas in the air intake pipe 2 pushes the sealing disk 12 to the left and stretches the tension spring adjacent to the sealing disk 12.

[0031] During the leftward movement of the sealing disk 12, the sealing disk 12 drives the conversion plate 14 and the sealing member 20 to move together, so that the conversion plate 14 releases the blockage of the waste discharge hole 141 and blocks the connection between the air inlet pipe 2 and the waste storage cylinder 3, and the sealing member 20 blocks the connection between the transfer cylinder 7 and the detection tube 8; under the gravity of the waste discharge pressure plate 4, there is a pressure difference between the waste gas in the waste gas chamber and the outside world, so that the waste gas stored in the waste gas chamber is gradually discharged into the waste discharge chamber 101 through the waste discharge hole 141, and then discharged to the outside world through the first through hole on the shell 1, and finally the waste discharge pressure plate 4 and the waste discharge sealing ring 5 are reset; the sample gas in the air inlet pipe 2 passes through the solid The gas passes through the gap between the fixed ring 11 and the sealing disk 12 and then enters the connecting tube 6, and then enters the transfer chamber through the connecting tube 6, so that the volume of the sample gas in the transfer chamber increases and pushes the transfer pressure plate 18 to move upward, and the transfer pressure plate 18 pulls the transfer sealing ring 19 to move and unfolds the transfer sealing ring 19 until the transfer pressure plate 18 moves to the highest point of the transfer cylinder 7, and the volume of the transfer chamber reaches the maximum. At this time, if the patient continues to blow air into the air inlet pipe 2, the air pressure in the transfer chamber increases and pushes the pressure relief valve 181 to open, and the excess sample gas in the transfer chamber is discharged into the air inlet chamber 102, and discharged to the outside through the second through hole on the shell 1.

[0032] When the volume of the transfer chamber reaches its maximum and the patient stops blowing into the air inlet pipe 2, the sample gas in the air inlet pipe 2 flows in the reverse direction and is discharged to the outside, reducing the air pressure in the air inlet pipe 2. The sample gas no longer flows through the gap between the fixed ring 11 and the sealing disk 12. At this time, the sealing disk 12 drives the conversion plate 14 and the sealing member 20 to move right and reset under the action of the adjacent tension spring, so that the sealing disk 12 contacts the fixed ring 11, and the conversion plate 14 blocks the waste discharge hole 141 again. The sealing member 20 releases the blockage of the connection between the transfer cylinder 7 and the detection tube 8. Under the action of the gravity of the transfer pressure plate 18, there is a pressure difference between the air pressure in the transfer chamber and the external gas, so that the sample gas in the transfer chamber enters the detection tube 8 at a uniform speed (due to the air inlet pipe 2). The right end of the trachea 2 is blocked by the fixing ring 11 and the sealing disk 12, so that the sample gas in the transfer chamber can only flow into the detection tube 8). The detection tube 8 guides the gas to pass through the oxygen sensor 9 and the detection sensor 10 in turn, and detects the oxygen, hydrogen and methane contents in the gas in turn. After the transfer pressure plate 18 is reset, the sample gas in the detection tube 8 stops flowing. At this time, the oxygen sensor 9 and the detection sensor 10 calibrate the detected data and display the calibrated data on the touch screen of the shell 1. At this point, the detection of hydrogen and methane concentrations in the exhaled gas of a single patient is completed. When another patient needs to be tested, the medical staff replaces a new disposable filter and repeats the above detection steps for detection.

[0033] Please refer to Figure 6-Figure 8 , also includes: a recoil cylinder 21, which is fixedly connected to the air inlet chamber 102, and an exhaust pipe 211 is arranged at the lower side of the recoil cylinder 21, and an exhaust check valve 22 is fixedly connected in the exhaust pipe 211, and the shell 1 is provided with a second through hole connecting the air inlet chamber 102 with the outside; an exhaust pipe 23, which is fixedly connected and connected to the lower side of the recoil cylinder 21, and is connected to the position of the connecting pipe 6 close to the air inlet pipe 2, and the connection point between the exhaust pipe 23 and the connecting pipe 6 is located on the side of the sealing disk 12 away from the fixed frame 13, and an exhaust check valve 24 is fixedly connected in the exhaust pipe 23; a recoil pressure plate 25, which is slidably connected in the recoil cylinder 21, and a bellows 26 is fixedly connected between the recoil pressure plate 25 and the recoil cylinder 21; a trigger assembly, which is arranged on the recoil cylinder 21, and is used to control the movement sequence of the recoil pressure plate 25 and the transfer pressure plate 18; the first through hole on the shell 1 and the second through hole on the shell 1 are respectively located on both sides of the shell 1.

[0034] In the above scheme, the purpose is to use the recoil cylinder 21 to store air (referring to the gas in the external environment), and after the detection is completed, the air in the recoil cylinder 21 is released, so that the air flows in the connecting pipe 6, the transfer chamber and the detection tube 8 and "flushes" them, thereby reducing the influence of the residual sample gas in the connecting pipe 6, the transfer chamber and the detection tube 8 on the subsequent detection; the recoil cylinder 21, the recoil pressure plate 25 and the bellows 26 together constitute a recoil chamber for temporarily storing air; the exhaust check valve 22 is connected from bottom to top, and the exhaust check valve 24 is connected from back to front; the first through hole on the shell 1 and the second through hole thereon are respectively arranged on the upper and lower sides of the shell 1, which can reduce the content of exhaust gas in the air of the recoil chamber, so that the content of various substances in the air in the recoil chamber is closer to the content of various substances in the external gas; the exhaust pipe 23 is connected to the right end of the connecting pipe 6.

[0035] Please refer to Figure 8 The trigger assembly includes: a support member 27, which is fixedly connected to the transfer pressure plate 18 and is used to squeeze the recoil pressure plate 25; a connecting frame 28, which is fixedly connected to the side of the recoil cylinder 21 close to the transfer cylinder 7, and the connecting frame 28 is rotatably connected to a Z-shaped frame 29, and a torsion spring is fixedly connected between the two, and the Z-shaped frame 29 is used to limit the recoil pressure plate 25, and the transfer pressure plate 18 is used to squeeze the Z-shaped frame 29.

[0036] In the above scheme, the swing of the Z-shaped frame 29 is used to control the order of movement of the transfer plate 18 and the back-punch plate 25; initially, the lower part of the Z-shaped frame 29 is in contact with the transfer plate 18, the torsion springs adjacent to the Z-shaped frame 29 are in a torsion storage state, and the Z-shaped frame 29 always has a tendency to rotate counterclockwise (the rotation perspective of this article is from front to back) under the action of its adjacent torsion springs; a limit column is provided on the connecting frame 28 (please refer to the attached Figure 8 ), used to limit the maximum angle of the Z-shaped frame 29 to rotate counterclockwise.

[0037] Please refer to Figure 6 and Fig. 9 , and further includes: a connecting ring 30, which is fixedly connected to the transfer sealing ring 19, and the connecting ring 30 is fixedly connected with a magnetic sheet 31, and the magnetic sheet 31 is used to block the connection between the transfer cylinder 7 and the detection tube 8, and the transfer cylinder 7 is a soft magnetic material.

[0038] In the above scheme, the purpose is to use the magnetic sheet 31 to seal the connection between the connecting tube 6 and the transfer cylinder 7, and to move the magnetic sheet 31 up and down during the process of the gas passing through the connection between the connecting tube 6 and the transfer cylinder 7, thereby driving the accumulation position of the transfer sealing ring 19 to be repeatedly turned over, so that the sample gas remaining at the accumulation position of the transfer sealing ring 19 can be discharged along with the air, further reducing the content of residual sample gas in the transfer sealing ring 19; the connecting ring 30 is fixedly connected to the middle part of the transfer sealing ring 19 after it is unfolded.

[0039] The above-mentioned steps for flushing the residual gas are as follows: in the process of the sample gas in the air inlet pipe 2 entering the transfer chamber through the connecting tube 6, the sample gas pressure in the connecting tube 6 first increases until the air pressure in the connecting tube 6 is sufficient to overcome the magnetic attraction between the magnetic sheet 31 and the transfer cylinder 7, and then the magnetic sheet 31 and the connecting ring 30 are pushed upward to release the blockage of the connection between the connecting tube 6 and the transfer cylinder 7 by the magnetic sheet 31. Subsequently, the volume of the sample gas in the transfer chamber gradually increases and pushes the transfer pressure plate 18 upward, and the transfer pressure plate 18 drives the connecting ring 30 and the magnetic sheet 31 to move upward through the transfer sealing ring 19.

[0040] During the upward movement of the transfer plate 18, the transfer plate 18 drives the recoil plate 25 to move upward together through the support 27, and the transfer plate 18 loses contact with the lower part of the Z-shaped frame 29, so that the Z-shaped frame 29 rotates counterclockwise under the action of the adjacent torsion spring and contacts with the limit column; as the recoil plate 25 moves upward, the recoil plate 25 drives the bellows 26 to gradually expand, so that the volume of the recoil chamber increases, and a pressure difference is generated at the exhaust pipe 211. As the above pressure difference increases, the exhaust check valve 22 opens, allowing the outside air to enter the recoil chamber through the exhaust pipe 211. The recoil plate 25 moves upward, and the distance between the recoil plate 25 and the upper part of the Z-shaped frame 29 gradually decreases, and finally the two contact each other. The recoil plate 25 pushes the Z-shaped frame 29 to rotate clockwise and twist its adjacent torsion spring until the transfer plate 18 moves to the highest point in the transfer cylinder 7. The volume of the recoil chamber reaches the maximum, the exhaust one-way valve 22 is closed, and the recoil plate 25 loses contact with the upper part of the Z-shaped frame 29. At this time, the Z-shaped frame 29 rotates counterclockwise under the action of the adjacent torsion spring, and the upper part of the Z-shaped frame 29 moves to the bottom of the recoil plate 25 to limit the recoil plate 25.

[0041] When the Z-shaped frame 29 limits the recoil pressure plate 25 and the sample gas in the transfer chamber begins to flow into the detection tube 8, the transfer pressure plate 18 drives the support member 27 to move downward. When the transfer pressure plate 18 moves down and resets, the magnetic suction sheet 31 contacts the transfer cylinder 7 again under the action of the magnetic suction force, and blocks the connection between the connecting tube 6 and the transfer cylinder 7. At the same time, the transfer pressure plate 18 contacts the lower part of the Z-shaped frame 29 and squeezes the Z-shaped frame 29 to rotate clockwise, twisting the adjacent torsion spring of the Z-shaped frame 29, so that the upper part of the Z-shaped frame 29 swings to the right and loses contact with the recoil pressure plate 25, releasing the limit on the recoil pressure plate 25. At this time, the recoil pressure plate 25 moves downward under the action of its gravity, and squeezes the air in the recoil chamber to flow into the exhaust pipe 23. The air in the exhaust pipe 23 squeezes the exhaust check valve 24 to open and enter the connecting pipe 6. At this time, the air pressure in the connecting pipe 6 gradually increases, and the magnetic suction piece 31 is pushed upward, and the blockage of the magnetic suction piece 31 on the connection between the connecting pipe 6 and the transfer cylinder 7 is released. At this time, a part of the air in the connecting pipe 6 enters the transfer chamber and is discharged to the outside through the detection tube 8, so that the air pressure in the connecting pipe 6 is reduced, and the magnetic suction piece 31 contacts the transfer cylinder 7 again under the action of gravity and magnetic attraction. The above steps of increasing the air pressure in the connecting pipe 6 are repeated to make the magnetic suction piece 31 move up and down. The magnetic suction piece 31 drives the transfer sealing ring 19 to shake through the connecting ring 30, so that the sample gas in the accumulation part of the transfer sealing ring 19 contacts the air flowing in the transfer chamber and is driven by the air to be discharged. In this way, the sample gas remaining in the connecting pipe 6, the transfer chamber and the detection tube 8 is flushed until the recoil pressure plate 25 is reset and the exhaust check valve 24 is closed.

[0042] Please refer to Figure 1-Figure 9 A calibration method for detecting the concentration of hydrogen and methane in exhaled gas, using the above-mentioned device for detecting the concentration of hydrogen and methane in exhaled gas, comprises the following steps: Step 1: Use oxygen sensor 9 to measure the oxygen concentration in the sample gas and record it; Step 2: Calculate the percentage of alveolar gas in the entire sample gas based on the oxygen concentration in the sample gas and the known oxygen concentration in the air; Step 3: Using the detection sensor 10 to measure the concentration values ​​of hydrogen and methane, and combining with the alveolar gas percentage, calculate the corrected concentration values ​​of hydrogen and methane; Step 4: Take the corrected hydrogen and methane concentration values ​​as the final values ​​and upload them to the instrument for subsequent processing.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A device for detecting the concentration of hydrogen and methane in exhaled gas, characterized in that: include: A shell (1), wherein a waste discharge chamber (101) and an air intake chamber (102) are provided in the shell (1), an air intake pipe (2) is fixedly connected to the shell (1), a waste storage cylinder (3) is fixedly connected to the waste discharge chamber (101), and the air intake pipe (2) is in communication with the lower side of the waste storage cylinder (3); A waste discharge pressure plate (4) is slidably connected in the waste storage barrel (3); a waste discharge sealing ring (5) is fixedly connected between the waste discharge pressure plate (4) and the waste storage barrel (3); and a connecting pipe (6) is fixedly connected and communicated with the air intake pipe (2); A central rotating cylinder (7) is fixedly connected to the air inlet cavity (102), and its lower side is connected to the connecting pipe (6). A detection tube (8) connected to the outside is fixedly connected to the lower side of the central rotating cylinder (7) and is connected thereto. An oxygen sensor (9) and a detection sensor (10) are installed in the housing (1), and the detection tube (8) is connected to the oxygen sensor (9) and the detection sensor (10) in sequence. A switching component is arranged in the connecting pipe (6) and is used to control the connection state between the air intake pipe (2) and the connecting pipe (6).

2. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 1, characterized in that: The switching component comprises: A fixing ring (11) fixedly connected to a side of the connecting pipe (6) close to the air inlet pipe (2); a fixing frame (13) fixedly connected to the connecting pipe (6), the fixing frame (13) being fixedly connected to a sealing disk (12) in contact with the fixing ring (11) via a tension spring, the fixing frame (13) and the sealing disk (12) being respectively located on two sides of the fixing ring (11), and the fixing frame (13) being located on a side of the sealing disk (12) close to the air intake pipe (2); A conversion plate (14) is sealingly and slidably connected in the waste storage barrel (3); the waste storage barrel (3) is provided with a waste discharge hole (141); the conversion plate (14) is used to sequentially block the waste discharge hole (141) and the connection between the air intake pipe (2) and the waste storage barrel (3); the housing (1) is provided with a first through hole connecting the waste discharge chamber (101) with the outside.

3. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 2, characterized in that: The sealing disk (12) is magnetic, and the fixing ring (11) is made of a soft magnetic material.

4. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 3, characterized in that: Also includes: A mounting frame (15) is fixedly connected to the upper side of the waste storage barrel (3); the mounting frame (15) is rotatably connected to a threaded knob (16); the threaded knob (16) is threadedly connected to an extrusion member (17) slidably connected to the mounting frame (15); the extrusion member (17) is used to limit the range of movement of the waste discharge pressure plate (4).

5. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 4, characterized in that: Also includes: A transfer pressure plate (18) is slidably connected in the transfer cylinder (7); the transfer pressure plate (18) is fixedly connected to and communicates with a pressure relief valve (181); a transfer sealing ring (19) is fixedly connected between the transfer pressure plate (18) and the transfer cylinder (7); A sealing member (20) is sealingly and slidably connected in the rotating cylinder (7), the sealing member (20) is fixedly connected to the sealing disk (12), and the sealing member (20) is used to block the connection between the rotating cylinder (7) and the detection tube (8).

6. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 5, characterized in that: Also includes: A recoil cylinder (21) is fixedly connected to the air inlet chamber (102); an air extraction pipe (211) is provided at the lower side of the recoil cylinder (21); an air extraction check valve (22) is fixedly connected to the air extraction pipe (211); and the housing (1) is provided with a second through hole for connecting the air inlet chamber (102) with the outside; an exhaust pipe (23) fixedly connected to and in communication with the lower side of the recoil cylinder (21), and in communication with a position of the connecting pipe (6) close to the air inlet pipe (2); the connecting point between the exhaust pipe (23) and the connecting pipe (6) is located on a side of the sealing disk (12) away from the fixing frame (13); an exhaust check valve (24) is fixedly connected in the exhaust pipe (23); A recoil plate (25) is slidably connected in the recoil cylinder (21), and a bellows (26) is fixedly connected between the recoil plate (25) and the recoil cylinder (21); A trigger assembly is arranged on the recoil cylinder (21) and is used to control the movement sequence of the recoil pressure plate (25) and the transfer pressure plate (18).

7. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 6, characterized in that: The first through hole on the shell (1) and the second through hole on the shell (1) are respectively located on two sides of the shell (1).

8. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 7, characterized in that: The trigger component comprises: A support member (27) fixedly connected to the intermediate pressure plate (18) and used for pressing the counter-punch pressure plate (25); A connecting frame (28) is fixedly connected to a side of the recoil cylinder (21) close to the intermediate cylinder (7); the connecting frame (28) is rotatably connected to a Z-shaped frame (29), and a torsion spring is fixedly connected therebetween; the Z-shaped frame (29) is used to limit the recoil pressure plate (25), and the intermediate pressure plate (18) is used to press the Z-shaped frame (29).

9. A device for detecting hydrogen and methane concentrations in exhaled gas according to claim 8, characterized in that: Also includes: A connecting ring (30) is fixedly connected to the transfer sealing ring (19); the connecting ring (30) is fixedly connected with a magnetic sheet (31); the magnetic sheet (31) is used to seal the connection between the transfer cylinder (7) and the detection tube (8); the transfer cylinder (7) is made of soft magnetic material.

10. A calibration method for detecting hydrogen and methane concentrations in exhaled gas, characterized in that: The device for detecting the concentration of hydrogen and methane in exhaled gas according to claim 9 comprises the following steps: Step 1: Use an oxygen sensor (9) to measure the oxygen concentration in the sample gas and record it; Step 2: Calculate the percentage of alveolar gas in the entire sample gas based on the oxygen concentration in the sample gas and the known oxygen concentration in the air; Step 3: Using the detection sensor (10) to measure the concentration values ​​of hydrogen and methane, and combining with the alveolar gas percentage, calculate the corrected concentration values ​​of hydrogen and methane; Step 4: Take the corrected hydrogen and methane concentration values ​​as the final values ​​and upload them to the instrument for subsequent processing.

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