A paramagnetic oxygen sensor and medical oxygen analysis system

Abstract

The application discloses a paramagnetic oxygen sensor and a medical oxygen analysis system, relates to the field of oxygen measurement, and comprises a gas sample box, an air inlet is formed in the gas sample box, a pressure reducing piece is arranged in the gas sample box, and a total gas path is formed in the pressure reducing piece, wherein the total gas path and the air inlet are in communication with each other, and the total gas path adopts a bending design; and a test main body is arranged at the outlet of the total gas path and is used for detecting the oxygen content of the gas to be detected. Through the above technical scheme, the oxygen content can be rapidly detected.

Description

Technical Field

[0001] This invention relates to the field of oxygen measurement, and more specifically to a paramagnetic oxygen sensor and a medical oxygen analysis system. Background Technology

[0002] Chinese invention patent publication number CN114002310A discloses a paramagnetic oxygen sensor with vibration resistance, comprising a gas sample chamber, a test body (including an optical lever, which rotates under the paramagnetic effect of oxygen) rotatably connected to the gas sample chamber, and an optical system for detecting the rotation of the test body. The gas sample chamber contains a gas sample cavity for containing a gas mixture. The optical system includes a photodetector, a mirror module, and a light source. The photodetector is coupled to a high-resolution ADC acquisition module, which is coupled to a Kalman filter module. The output of the Kalman filter module is used to connect to an external smart device. By incorporating the high-resolution ADC acquisition module and the Kalman filter module, the sensor ensures a fast response time T90 while reducing interference noise. The mirror module further increases the amplification ratio of the optical lever, making the sensor's detection results more accurate.

[0003] While this method can solve the problem of rapid response in paramagnetic oxygen sensors, in actual operation, when the gas to be detected is introduced into the paramagnetic oxygen sensor, the high gas pressure causes the gas entering the gas sample chamber to continuously drive the optical lever to rotate. After the gas to be detected is introduced, the airflow causes the optical lever to continue rotating until it reaches a stable state, at which point the optical system of this invention can quickly detect and output oxygen content data. Clearly, during optical system detection, the optical lever needs to be in a stationary tilted state to output stable data, a process that takes a significant amount of time.

[0004] Therefore, it is urgent to solve the existing problems. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a paramagnetic oxygen sensor and a medical oxygen analysis system to solve the technical problem of excessive air pressure in the gas flow to be detected.

[0006] First aspect

[0007] To achieve the above objectives, the present invention provides a paramagnetic oxygen sensor, comprising:

[0008] The gas sample chamber is equipped with an air inlet.

[0009] A pressure reducing device is installed inside the gas sample box, and a main gas passage is provided on the pressure reducing device. The main gas passage and the air inlet are interconnected, and the main gas passage adopts a bent design.

[0010] The test body is used to detect the oxygen content of the gas to be tested, and the test body is located at the outlet of the main gas path.

[0011] By adopting the above scheme, the pressure of the gas to be tested can be reduced. When the gas to be tested is introduced into the gas sample chamber, it enters the main gas path through the inlet. Because the main gas path adopts a tortuous design, the high-pressure gas flow will continuously change its direction as it flows through the main gas path. The high-pressure gas flow will experience a certain amount of energy loss during this process, thereby achieving the purpose of pressure reduction. Finally, when the gas to be tested flows out of the main gas path, its pressure will be reduced. The reduced pressure airflow has less impact on the test subject, allowing the optical system to quickly detect the oxygen content in the gas to be tested.

[0012] As a further description of the above technical solution, the pressure-reducing component includes:

[0013] The fixing plate has multiple fixing interfaces that form a plug-in part;

[0014] The movable plate has multiple movable insertion interfaces. The insertion part is inserted into the movable plate through the movable insertion interfaces. After the fixed plate and the movable plate are inserted, an insertion gap is formed between the fixed plate and the movable plate. The insertion gap is the main air passage.

[0015] By employing the above scheme, the pressure of the gas to be tested can be reduced. A fixed plate and a movable plate are set up, and the fixed plate and the movable plate are interlocked to form an interlocking gap. Due to the special nature of the interlocking gap, it exhibits multiple continuous "S"-shaped designs. When the gas to be tested passes through the interlocking gap, the gas flow direction changes continuously, thereby achieving the purpose of pressure reduction. Furthermore, compared to directly forming a bent main gas path, the interlocking method is simpler.

[0016] As a further description of the above technical solution, the fixing plate is provided with a plurality of first through holes, the first through holes and the fixing interface are interconnected, and the axis of the first through hole intersects the path of the fixing interface;

[0017] The movable plate has multiple second through holes, which are connected to the movable plug-in interface. The axis of the second through hole intersects the path of the movable plug-in interface.

[0018] The first through hole is connected to the second through hole, and the first through hole and the corresponding connected second through hole are misaligned.

[0019] By adopting the above technical solution, the air pressure can be further reduced. Although setting the insertion gap can reduce air pressure, the airflow path becomes longer, which is a technical problem that this application ultimately needs to solve: rapid response. A longer airflow path will inevitably affect the detection time of the test subject. To solve this problem, this technical solution forms a vertical air path by setting a first through hole and a second through hole. The vertical air path and the insertion gap are interconnected. When the airflow to be tested flows into the pressure reducing component, it flows into both the vertical air path and the insertion gap. Because the vertical air path is shorter and interconnected with the insertion gap, it effectively shortens the airflow's movement time in the insertion gap, thus achieving rapid flow into the test subject. Furthermore, the vertical air path is formed by the staggered first and second through holes, resulting in multiple stepped surfaces. The airflow flowing through the vertical air path is also depressurized by these stepped surfaces, ultimately achieving rapid pressure reduction.

[0020] As a further description of the above technical solution, the fixed plate is fixedly connected inside the gas sample box, and the movable plate is slidably installed inside the gas sample box.

[0021] By employing the above technical solution, the pressure of the gas to be detected can be adjusted. While setting up a vertical gas path can both reduce the pressure of the gas to be detected and shorten its path, thus accelerating the response, in actual operation, if the stepped surface of the vertical gas path is too large, the gas flow rate through the vertical gas path will be too small, in which case the path-shortening effect of the vertical gas path will be insignificant; if the stepped surface of the vertical gas path is too small, the pressure reduction effect of the vertical gas path will be insignificant. To solve this technical problem, a movable plate is slidably installed inside the gas sample chamber. The position of the movable plate is adjusted according to the pressure of the gas to be detected, thereby changing the size of the stepped surface of the vertical gas path, thus enabling the vertical gas path to achieve both optimal pressure reduction and path shortening.

[0022] As a further description of the above technical solution, it also includes:

[0023] A lead screw and nut assembly, wherein the nut of the lead screw and nut assembly is fixedly connected to the moving plate;

[0024] A driving component for driving the lead screw of the lead screw and nut assembly to rotate.

[0025] By adopting the above technical solution, the goal of high adjustment accuracy of the moving plate can be achieved. To ensure the vertical air path reaches its optimal state during the movement of the moving plate, high accuracy in its position is required. In practical applications, various transmission components can be selected to drive the movement of the moving plate, such as cylinders, hydraulic cylinders, linkage mechanisms, and worm gears. However, using these transmission components only enables the moving plate to move, but cannot guarantee its positional accuracy. In this solution, a screw-nut pair mechanism is used as the transmission component, which can satisfy the need to move the moving plate while ensuring its positional accuracy. Because the screw-nut pair mechanism itself has a stepless adjustment function, the moving plate can achieve continuous movement, although the movement speed is relatively slow. Finally, the screw-nut pair mechanism also has a fast response, achieving the goal of stopping the screw rotation and the nut stopping its movement simultaneously.

[0026] As a further description of the above technical solution, it also includes an elastic element, wherein the fixed plate is fixedly connected inside the gas sample box, and the movable plate is connected inside the gas sample box through the elastic element.

[0027] By adopting the above technical solution, adaptive pressure reduction can be achieved. When no gas to be tested is introduced into the gas sample chamber, the elastic element is in its natural state, and the stepped surface of the vertical gas path is at its maximum. When the gas to be tested is introduced into the gas sample chamber, the gas entering the vertical gas path pulls the elastic element, causing the vertical gas path to open continuously. That is, the stepped surface of the vertical gas path continuously decreases. During this process, the airflow in the vertical gas path does work on the elastic element, resulting in a loss of some pressure. On the other hand, the continuous opening of the vertical gas path increases the airflow, significantly shortening the path of the gas to be tested. Although the decreasing stepped surface weakens the ability to reduce air pressure, the pressure reduction capacity of the vertical gas path itself is enhanced because the work done by the elastic element is overcome. In this application, a smaller stepped surface in the vertical gas path not only increases the airflow but also significantly enhances the pressure reduction effect. This solution is clearly better than the solution where the moving plate is slidably installed inside the gas sample chamber.

[0028] As a further description of the above technical solution, it also includes a flow equalization membrane, which is disposed between the outlet of the main gas path and the test body.

[0029] By adopting the above technical solution, the purpose of stabilizing the airflow can be achieved. Although the pressure reducing device can reduce the pressure of the gas to be tested, after the gas to be tested is depressurized by the pressure reducing device, the gas to be tested flowing out of the main gas path will still spray onto the test body. Therefore, it is necessary to further depressurize the gas to be tested at the outlet of the main gas path. To solve this problem, a flow equalization membrane is set up. When the gas to be tested in the main gas path is ejected from the outlet of the main gas path, the pressure of the gas to be tested at the outlet of the main gas path is greater than the pressure of the gas to be tested around the outlet of the main gas path. After these gases to be tested pass through the flow equalization membrane, the gas to be tested with different pressures will be equalized by the flow equalization membrane. Thus, it can be understood that the pressure of the gas to be tested at the outlet of the main gas path is indirectly reduced.

[0030] As a further description of the above technical solution, the flow equalization membrane is oriented in the direction in which oxygen applies a force to the optical lever of the test subject.

[0031] By adopting the above technical solution, the jitter of the optical lever can be reduced. While setting up a flow equalization membrane and a pressure reducing device can lower the pressure of the gas to be detected, thus preventing the optical lever from taking a long time to stop jittering due to high gas pressure, and ultimately achieving rapid detection of the oxygen content in the gas, in actual use, the gas flowing out of the flow equalization membrane is not pressureless, but rather has a lower pressure. However, considering that the lower pressure still affects the optical lever, to reduce this impact, the position of the flow equalization membrane is defined so that its direction is towards the direction in which oxygen exerts force on the optical lever. Thus, when the gas to be detected blows towards the optical lever, the reaction force exerted by the oxygen on the optical lever reduces the impact of the gas's blowing force on the optical lever, ultimately reducing optical lever jitter and enabling the detection structure to respond quickly.

[0032] Second aspect

[0033] This invention provides a medical oxygen analysis system, comprising:

[0034] A paramagnetic oxygen analyzer, wherein the paramagnetic oxygen analyzer is a paramagnetic oxygen sensor as described in the first aspect;

[0035] Electrolytic micro-water analyzer is used to detect the water content in the gas to be tested;

[0036] An infrared gas analyzer is used to detect the content of CO or CO2 in a gas to be tested.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The pressure of the gas to be tested is reduced by setting a pressure reducing element.

[0039] 2. A total air path is formed by setting up interconnected vertical air paths and insertion gaps. The insertion air path achieves the purpose of reducing pressure by constantly changing the airflow direction, while the vertical air path achieves the purpose of reducing pressure by setting up stepped surfaces. In addition, since the vertical air path and the insertion air path are interconnected, the vertical air path also serves to shorten the airflow path.

[0040] 3. By setting a lead screw and nut pair, the position of the moving plate can be precisely adjusted, thereby achieving optimal pressure reduction and shortening of the path in the vertical air path.

[0041] 4. By setting up elastic components to cooperate with the vertical air passage, the smaller the step surface of the vertical air passage, the greater the air flow and the more significantly the pressure reduction effect can be enhanced.

[0042] 5. By setting up a flow equalization membrane, the pressure of the gas to be tested flowing out of the main gas path can be further reduced.

[0043] 6. The outlet direction of the flow equalization membrane is opposite to the stable direction of the optical lever (the direction of the force exerted by oxygen on the optical lever), which can reduce the vibration of the optical lever and thus enable the detection structure to respond quickly. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of a paramagnetic oxygen sensor according to Embodiment 1 of this application;

[0045] Figure 2 This is a schematic diagram of the structure of a paramagnetic oxygen sensor according to Embodiment 2 of this application.

[0046] In the picture:

[0047] 1. Gas sample chamber; 11. Air inlet; 2. Pressure reducing component; 21. Main gas path; 211. Insertion gap; 212. Vertical gas path; 2121. First through hole; 2122. Second through hole; 22. Fixing plate; 221. Fixed insertion interface; 222. Insertion part; 23. Moving plate; 231. Moving insertion interface; 3. Test body; 31. Optical lever; 4. Lead screw and nut pair; 41. Lead screw; 42. Nut; 5. Driving component; 6. Elastic component; 7. Flow equalization membrane; 8. Optical system; 81. Light source; 82. Reflector; 83. Photodetector. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The following is in conjunction with the appendix Figure 1 and Figure 2 The following describes some embodiments of the present invention in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] First aspect

[0051] Example 1

[0052] This invention provides a paramagnetic oxygen sensor; please refer to [link / reference]. Figure 1 As shown, it includes a gas sample chamber 1, a pressure reducing device 2, a test body 3, a lead screw and nut assembly 4, a drive component 5, a flow equalization membrane 7, and an optical system 8. Among them:

[0053] Gas sample box 1 is used to store the gas to be tested. It has an inlet 11 and an outlet 11.

[0054] Test body 3 is used to detect the oxygen content in the gas to be tested. It includes an optical lever 31 and a magnetic field generating device. The optical lever 31 is rotatably mounted inside the gas sample chamber 1. The magnetic field generating device is used to generate a magnetic field, usually an electromagnet. The electromagnet generates a non-uniform magnetic field inside the gas sample chamber 1. When the gas to be tested is introduced into the gas sample chamber 1, because oxygen is paramagnetic, it provides a rotational torque to the optical lever 31. The optical lever 31 rotates under the action of the rotational torque. After the optical lever 31 stabilizes, it is tilted at an angle.

[0055] The optical system 8 is used to output the rotation angle signal of the optical lever 31 in the test body 3 as a readable digital signal. It includes a light source 81, a reflector 82, a photodetector 83, and an ADC acquisition module. The reflector 82 is fixedly mounted on the optical lever 31, so that when oxygen drives the optical lever 31 to rotate, the reflector 82 also rotates with the optical lever 31; that is, the rotation angle of the optical lever 31 and the rotation angle of the reflector 82 are the same. The light emitted by the light source 81 enters the photodetector 83 under the action of the reflector 82. The photodetector 83 transmits the collected reflected light to the ADC acquisition module, which converts the optical signal into a readable digital signal, thereby accurately reading the oxygen content in the gas to be tested. Furthermore, the principles of light collection and detection, as well as the working principles of the photodetector 83 and the ADC acquisition module, can be found in Chinese Invention Patent Publication No. CN114002310A, and will not be elaborated further here.

[0056] Pressure reducing component 2 is used to reduce the gas pressure when the gas to be tested enters the inlet 11 of the gas sample chamber 1. It includes a fixed plate 22 and a movable plate 23. The fixed plate 22 is fixedly connected to the left side wall inside the gas sample chamber 1. Multiple fixed insertion interfaces 221 are formed on the right side of the fixed plate 22, creating insertion portions 222. Furthermore, multiple through holes 2121 are formed on the upper surface of the fixed plate 22, communicating with the fixed insertion interfaces 221. Multiple movable insertion interfaces 231 are formed on the left side of the movable plate 23. Additionally, multiple through holes 2122 are formed on the movable plate 23, communicating with the movable insertion interfaces 231. When the movable insertion interface 231 of the movable plate 23 is inserted into the insertion part 222 of the fixed plate 22, an S-shaped insertion gap 211 is formed between the movable plate 23 and the fixed plate 22 at the insertion point. Furthermore, a vertical air passage 212 with a stepped surface is also formed between a first through hole 2121 and a second through hole 2122. That is, the insertion gap 211 and the vertical air passage 212 together constitute the total air passage 21 of the pressure reducing member 2. When the gas to be tested is introduced into the inlet 11 of the gas sample box 1, the gas to be tested will first pass through the main gas path 21 before flowing to the optical lever 31. The main gas path 21 is composed of the insertion gap 211 and the vertical gas path 212. The insertion gap 211 adopts an S-shaped design. Therefore, the gas to be tested flowing into the insertion gap 211 will constantly change its flow direction. In this process, there will inevitably be a certain pressure loss. However, in the process of pressure loss, the S-shaped insertion gap 211 will also increase the airflow path. In this application, the purpose of pressure reduction is to prevent the optical lever 31 from being affected by the airflow to be tested, so that the optical lever 31 will shake continuously, thereby prolonging the detection time. However, the condition for pressure reduction of the insertion gap 211 is based on the premise of prolonging the path. Therefore, in terms of the detection response, the detection response effect is not obvious. By setting up a vertical air passage 212, which remains connected to the insertion gap 211, the airflow path of the insertion gap 211 is reduced, thereby achieving a faster response time for the detection result. Furthermore, due to the stepped surface of the vertical air passage 212, some pressure loss occurs when the airflow to be detected flows within it. In summary, the main air passage 21, composed of the vertical air passage 212 and the insertion gap 211, achieves both rapid pressure reduction and a fast detection response.

[0057] The lead screw and nut assembly 4 is used to adjust the stepped surface of the vertical air passage 212. While the vertical air passage 212 can shorten the path of the gas to be detected and reduce pressure, if the stepped surface of the vertical air passage 212 is too large, the airflow through the vertical air passage 212 will be small, and the effect of shortening the path will be insignificant. If the stepped surface of the vertical air passage 212 is too small, the pressure reduction effect will be insignificant. To solve this technical problem, the moving plate 23 and the nut 42 of the lead screw and nut assembly 4 are fixedly connected. The position of the moving plate 23 is adjusted according to the pressure of the gas to be detected, thus changing the size of the stepped surface of the vertical air passage 212, thereby enabling the vertical air passage 212 to achieve both optimal pressure reduction and path shortening. Furthermore, the lead screw and nut assembly 4 includes a lead screw 41, a nut 42, and a slider (not shown in the figure). Among them, nut 42 and moving plate 23 are fixedly connected, slider is fixedly connected to the front and rear sides of nut 42, and sliding grooves (not shown in the figure) are opened on the front and rear inner walls of gas sample box 1. The slider is slidably set on the sliding groove. Finally, screw 41 is threadedly connected to nut 42.

[0058] The drive component 5 is used to drive the lead screw 41 in the lead screw and nut assembly 4 to rotate, and the rotating lead screw 41 drives the nut 42 to move in a specific direction. The drive component 5 can be a servo motor or a stepper motor, or other drive components with output rotational torque.

[0059] The flow equalization membrane 7 is used to maintain the different pressures of the gas to be tested flowing out of the insertion gap 211 and the vertical gas path 212 at the same pressure. In order to counteract the influence of the gas to be tested flowing out of the flow equalization membrane 7 on the optical lever 31, the flow equalization membrane 7 is placed between the pressure reducing member 2 and the optical lever 31. In addition, the flow equalization membrane 7 is fixedly placed inside the gas sample box 1.

[0060] The working principle of this invention is described below:

[0061] The gas in the gas sample chamber 1 is evacuated by vacuuming to prevent residual gas from interfering with the oxygen content of the gas to be tested. After the gas in the gas sample chamber 1 is emptied, the valve at the outlet of the gas sample chamber 1 is closed. Then, the valve at the inlet 11 of the gas sample chamber 1 is opened to allow the gas to be tested to enter the gas sample chamber 1. Due to the different opening degrees of the valves, the gas pressure of the gas to be tested entering the gas sample chamber 1 is also different. According to the different pressures at the inlet 11 of the gas to be tested, the drive component 5 is activated. The drive component 5 adjusts the lead screw and nut pair 4, that is, the drive component 5 drives the moving plate 23 to move. Since the lead screw and nut pair 4 has the advantages of stepless adjustment and fast response, the moving plate 23 can be quickly and accurately adjusted to the expected position, so that the stepped surface of the vertical gas path 212 is in the optimal position. This satisfies the requirement of shortening the path of the gas to be tested in the vertical gas path 212, while also achieving the purpose of reducing pressure and relatively large gas flow. The gas to be tested continuously switches its flow direction between the insertion gap 211 and the vertical gas path 212, thereby achieving pressure reduction. When the gas to be tested flows out from the vertical gas path 212 and the insertion gap 211, the pressure varies. If this portion of the airflow is directly introduced into the optical lever 31, it will cause random and uncertain interference to the optical lever 31. By setting the flow equalization membrane 7, the pressure of the gas to be tested flowing out from the main gas path 21 can be stabilized at a uniform pressure. In terms of force, the pressure of the gas to be detected is controllable. Due to its paramagnetic properties, the oxygen in the gas to be detected exerts a downward rotational torque on the optical lever 31. By placing the flow equalization membrane 7 below the optical lever 31, when the gas to be detected continuously flows out from the flow equalization membrane 7, the gas to be detected exerts an upward impact force on the optical lever 31, while the oxygen exerts a downward rotational torque on the optical lever 31. Therefore, the oxygen can offset part of the impact force of the gas to be detected, thereby enabling the optical lever 31 to quickly maintain balance and ultimately achieve the purpose of rapid detection of oxygen content.

[0062] Example 2

[0063] This invention provides a paramagnetic oxygen sensor; please refer to [link / reference]. Figure 2 As shown, the difference from Embodiment 1 is that the lead screw and nut assembly 4 and the drive component 5 in Embodiment 1 are replaced with the elastic component 6. Wherein:

[0064] The elastic element 6 is a spring, and the two ends of the spring are fixedly connected to the moving plate 23 and the right side wall inside the gas sample box 1, respectively.

[0065] The following describes the working method of this application:

[0066] When no gas to be tested is introduced into the gas sample chamber 1, the elastic element 6 is in its natural state, and the stepped surface of the vertical air passage 212 is at its maximum. When the gas to be tested is introduced into the gas sample chamber 1, the gas entering the vertical air passage 212 pulls the elastic element 6, causing the vertical air passage 212 to open continuously. That is, the stepped surface of the vertical air passage 212 continuously decreases. During this process, the airflow in the vertical air passage 212 does work on the elastic element 6, resulting in a loss of some pressure. On the other hand, as the vertical air passage 212 continuously opens, the airflow rate of the vertical air passage 212 increases, greatly shortening the path of the gas to be tested. Although the ability of the continuously shrinking stepped surface to reduce air pressure weakens, the pressure reduction capability of the vertical air passage 212 itself is enhanced because the work done by the elastic element 6 is overcome. In this embodiment, a smaller stepped surface in the vertical air passage 212 not only increases the airflow rate but also significantly enhances the pressure reduction effect.

[0067] In summary, in practical use, Example 2 is preferred for detecting oxygen content.

[0068] Second aspect

[0069] The present invention also provides a medical oxygen analysis system, comprising:

[0070] A paramagnetic oxygen analyzer, wherein the paramagnetic oxygen analyzer is a paramagnetic oxygen sensor as described in the first aspect;

[0071] Electrolytic micro-water analyzer is used to detect the water content in the gas to be tested;

[0072] An infrared gas analyzer is used to detect the content of CO or CO2 in a gas to be tested.

[0073] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paramagnetic oxygen sensor, characterized in that, include: The gas sample box (1) is equipped with an air inlet (11); Pressure reducing component (2) is installed inside the gas sample box (1), and a main gas passage (21) is provided on the pressure reducing component (2), wherein the main gas passage (21) and the air inlet (11) are interconnected, and the main gas passage (21) adopts a bent design; The test body (3) is used to detect the oxygen content of the gas to be tested. The test body (3) is set at the outlet of the main gas path (21). The pressure-reducing component (2) includes: The fixing plate (22) has multiple fixing interfaces (221) and forms a plug-in part (222); The movable plate (23) has multiple movable insertion interfaces (231). The insertion part (222) is inserted into the movable plate (23) through the movable insertion interfaces (231). After the fixed plate (22) and the movable plate (23) are inserted, an insertion gap (211) is formed between the fixed plate (22) and the movable plate (23). The insertion gap (211) is the main air passage (21). The fixing plate (22) has a plurality of first through holes (2121), the first through holes (2121) and the fixing interface (221) are interconnected, and the axis of the first through hole (2121) intersects the path of the fixing interface (221); The movable plate (23) has a plurality of second through holes (2122), the second through holes (2122) and the movable plug-in interface (231) are interconnected, and the axis of the second through hole (2122) intersects the path of the movable plug-in interface (231); A first through hole (2121) is connected to a second through hole (2122), and the first through hole (2121) and the corresponding connected second through hole (2122) are misaligned. It also includes a flow equalization membrane (7), which is disposed between the outlet of the main gas path (21) and the test body (3).

2. The paramagnetic oxygen sensor according to claim 1, characterized in that: The fixed plate (22) is fixedly connected inside the gas sample box (1), and the movable plate (23) is slidably installed inside the gas sample box (1).

3. A paramagnetic oxygen sensor according to claim 2, characterized in that, Also includes: A lead screw and nut assembly (4) is fixedly connected to the nut (42) of the lead screw and nut assembly (4) and the moving plate (23); The drive unit (5) is used to drive the lead screw of the lead screw nut pair (4) to rotate.

4. A paramagnetic oxygen sensor according to claim 1, characterized in that: It also includes an elastic element (6), the fixed plate (22) is fixedly connected inside the gas sample box (1), and the movable plate (23) is connected inside the gas sample box (1) through the elastic element (6).

5. A paramagnetic oxygen sensor according to claim 1, characterized in that: The flow equalization membrane (7) is oriented in the direction in which oxygen is applied to the optical lever (31) of the test body (3).

6. A medical oxygen analysis system, characterized in that, include: A paramagnetic oxygen analyzer, wherein the paramagnetic oxygen analyzer is a paramagnetic oxygen sensor as described in claim 5; Electrolytic micro-water analyzer is used to detect the water content in the gas to be tested; An infrared gas analyzer is used to detect the content of CO or CO2 in a gas to be tested.

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