Ventilation device and paramagnetic gas sensor

Abstract

A ventilation device and a paramagnetic gas sensor are disclosed. The ventilation device includes an inspiratory branch, an expiratory branch, and a paramagnetic oxygen sensor, the paramagnetic oxygen sensor being connected to the inspiratory branch or the expiratory branch. The paramagnetic oxygen sensor includes an air circuit assembly, an electromagnet assembly, a measuring plate assembly, and a piping assembly. The air circuit assembly includes a sample gas branch and a reference gas branch. The electromagnet assembly forms an air gap with a magnetic field. The measuring plate assembly includes a measuring plate, a first microphone, and a second microphone, the first and second microphones being electrically connected to the measuring plate. The piping assembly includes a first piping, a second piping, a third piping, and a fourth piping. The first piping guides sample gas from the sample gas branch to the air gap, the second piping guides reference gas from the reference gas branch to the air gap, the third piping connects the first piping and the first microphone, and the fourth piping connects the second piping and the second microphone. The measuring plate assembly is located outside a line connecting any point on the electromagnet assembly and any point on the air circuit assembly.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a ventilation device and a paramagnetic gas sensor. Background Art

[0002] Ventilation devices, such as monitors, anesthesia machines, and ventilators, require oxygen sensors to monitor the oxygen content of the patient's inhaled air. Existing ventilation devices typically use oxygen cells installed on the device to monitor the oxygen content of the patient's inhaled air. However, these cells become ineffective after depletion of their material and require regular replacement, which is inconvenient and costly.

[0003] To this end, paramagnetic oxygen sensors have been developed on the market. Paramagnetic oxygen sensors use the paramagnetic properties of oxygen molecules to detect the oxygen content in the gas. They are not affected by the detection environment and have a long service life.

[0004] However, existing paramagnetic oxygen sensors have a complex structure, many bends in the gas path, and a lot of gas loss, which makes the detection results inaccurate. Summary of the Invention

[0005] In view of this, the present invention proposes a ventilation device and a paramagnetic gas sensor.

[0006] The ventilation device provided in the first aspect of the present invention comprises an inspiratory branch, an expiratory branch, and a paramagnetic oxygen sensor, wherein the inspiratory branch is used to supply fresh gas to the patient, the expiratory branch is used to receive gas exhaled by the patient, and the paramagnetic oxygen sensor is connected to the inspiratory branch or the respiratory branch, and is used to detect the oxygen content of the fresh gas in the inspiratory branch or the respiratory branch, wherein the paramagnetic oxygen sensor comprises:

[0007] A gas circuit assembly, comprising a sample gas branch and a reference gas branch, wherein the sample gas branch is used to transport the sample gas to be detected, and the reference gas branch is used to transport the reference gas;

[0008] an electromagnet assembly for forming an air gap having a magnetic field;

[0009] a measurement board assembly, comprising a measurement board, a first microphone and a second microphone, wherein the first microphone and the second microphone are electrically connected to the measurement board;

[0010] a pipeline assembly comprising a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, wherein the first pipeline connects the sample gas branch and the electromagnet assembly and is used to guide the sample gas from the sample gas branch to the air gap; the second pipeline connects the reference gas branch and the electromagnet assembly and is used to guide the reference gas from the reference gas branch to the air gap to mix with the sample gas; the third pipeline connects the first pipeline and the first microphone and is used to detect the air pressure oxygen content of the first pipeline; the fourth pipeline connects the second pipeline and the second microphone and is used to detect the air pressure oxygen content of the second pipeline;

[0011] The measuring plate assembly is located outside a line connecting any point on the electromagnet assembly and any point on the gas path assembly. The electromagnet assembly and the measuring plate assembly are located on different sides of the gas path assembly.

[0012] The paramagnetic gas sensor provided in the second aspect of the present invention comprises:

[0013] A gas circuit assembly, comprising a sample gas branch and a reference gas branch, wherein the sample gas branch is used to transport the sample gas to be detected, and the reference gas branch is used to transport the reference gas;

[0014] an electromagnet assembly for forming an air gap having a magnetic field;

[0015] a measurement board assembly, comprising a measurement board, a first microphone and a second microphone, wherein the first microphone and the second microphone are electrically connected to the measurement board;

[0016] a pipeline assembly comprising a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, wherein the first pipeline connects the sample gas branch and the electromagnet assembly and is used to guide the sample gas from the sample gas branch to the air gap; the second pipeline connects the reference gas branch and the electromagnet assembly and is used to guide the reference gas from the reference gas branch to the air gap to mix with the sample gas; the third pipeline connects the first pipeline and the first microphone and is used to detect the air pressure of the first pipeline; the fourth pipeline connects the second pipeline and the second microphone and is used to detect the air pressure of the second pipeline;

[0017] The measuring plate assembly is located outside a line connecting any point on the electromagnet assembly and any point on the gas path assembly. The electromagnet assembly and the measuring plate assembly are located on different sides of the gas path assembly.

[0018] As can be seen from the above technical solution, the ventilation device proposed in the first aspect of the present invention, by arranging the measuring plate assembly to be located outside the line connecting any point on the electromagnet assembly and any point on the gas path assembly, does not hinder the arrangement of the first pipeline and the second pipeline, thereby reducing the number of bends in the first pipeline and the second pipeline and reducing gas loss, thereby improving the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained from these drawings without any creative work.

[0020] Figure 1 is a schematic diagram of a partial structure of a ventilation device proposed in an embodiment of the present invention;

[0021] Figure 2 1 is a schematic structural diagram of a paramagnetic oxygen sensor proposed in an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the gas path of the paramagnetic oxygen sensor proposed in an embodiment of the present invention;

[0023] Figure 4 1 is a schematic structural diagram of a paramagnetic oxygen sensor proposed in an embodiment of the present invention;

[0024] Figure 5 1 is an exploded diagram of a paramagnetic oxygen sensor according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the connection between the paramagnetic oxygen sensor and the intake branch proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] like Figures 1 to 5 As shown, an embodiment of the present invention provides a ventilation device 100, such as a ventilator. The proposed ventilation device 100 includes an inspiratory branch 10, an expiratory branch 20, and a paramagnetic oxygen sensor 30. The inspiratory branch 10 is used to supply fresh air to the patient, and the expiratory branch 20 is used to receive gas exhaled by the patient. The paramagnetic oxygen sensor 30 is connected to the inspiratory branch 10 and is used to detect the oxygen content of the gas in the inspiratory branch 10. The paramagnetic oxygen sensor 30 includes an air circuit assembly 31, an electromagnet assembly 32, a measurement board assembly 33, and a piping assembly 34. The air circuit assembly 31 includes a sample gas branch 311 and a reference gas branch 312. The sample gas branch 311 is used to transport a sample gas to be tested, and the reference gas branch 312 is used to transport a reference gas. The electromagnet assembly 32 is used to form an air gap 321 having a magnetic field. The measurement board assembly 33 includes a measurement board 331, a first microphone 332, and a second microphone 333. The first microphone 332 and the second microphone 333 are electrically connected to the measurement board 331. In another embodiment of the present invention, the ventilation device 100 may be an anesthesia machine, and the paramagnetic oxygen sensor 30 may be used to detect the oxygen content of the gas in the expiratory limb 20.

[0030] The pipeline assembly 34 includes a first pipeline 341, a second pipeline 342, a third pipeline 343, and a fourth pipeline 344. The first pipeline 341 is used to guide the sample gas from the sample gas branch 311 to the air gap 321. The second pipeline 342 is used to guide the reference gas from the reference gas branch 312 to the air gap 321 to mix with the sample gas. The third pipeline 343 connects the first pipeline 341 and the first microphone 332, which is used to detect the air pressure in the first pipeline 341. The fourth pipeline 344 connects the second pipeline 342 and the second microphone 333, which is used to detect the air pressure in the second pipeline 342. The measurement board assembly 33 is located outside the line connecting any point on the electromagnet assembly 32 and any point on the gas circuit assembly 31. The connecting line refers to the line segment from the electromagnet assembly 32 to the gas circuit assembly 31, and does not include the extension line outside this line segment.

[0031] During use, the sample gas in the sample gas branch 311 is directed to the air gap 321 via the first conduit 341, while the reference gas in the reference gas branch 312 is directed to the air gap 321 via the second conduit 342. The sample and reference gases mix in the air gap 321. Because oxygen molecules are paramagnetic, they become magnetized in a certain magnetic field, forming a paramagnetic alignment. This generates a localized, small magnetic pressure. This paramagnetic alignment alters the molecular motion of the oxygen molecules, leading to a change in gas pressure within the gas path. The magnitude of this magnetic pressure is proportional to the oxygen concentration. The pressure of the sample gas in the first conduit 341 can be measured by the first microphone 332 using the acoustic pressure method. The oxygen concentration of the reference gas is known. For example, if the reference gas is atmospheric air with an oxygen concentration of 20.8%, the pressure of the reference gas in the second conduit 342 can be measured by the second microphone 333 using the acoustic pressure method. The oxygen concentration of the sample gas can be determined by the ratio of the gas pressure to the oxygen concentration in the sample and reference gases.

[0032] The ventilation device 100 proposed in an embodiment of the present invention, by arranging the measuring plate assembly 33 to be located outside the line connecting any point on the electromagnet assembly 32 and any point on the gas path assembly 31, the measuring plate assembly 33 will not hinder the arrangement of the first pipeline 341 and the second pipeline 342, so that the first pipeline 341 and the second pipeline 342 have fewer bends and less gas loss, which can improve the accuracy of the detection results.

[0033] In some embodiments, the gas circuit assembly 31 includes an integrated gas circuit board, which includes a sample gas branch 311 and a reference gas branch 312. Optionally, the integrated gas circuit board is an acrylic plate, and the sample gas branch 311 and the reference gas branch 312 are formed by machining the acrylic plate. For example, holes are drilled in the acrylic plate to form the sample gas branch 311 and the reference gas branch 312, or half of a groove for the sample gas branch 311 and a groove for the reference gas branch 312 are formed in two acrylic plates, respectively. When the two acrylic plates are connected together, the two halves of the groove for the sample gas branch 311 and the groove for the reference gas branch 312 are combined to form the sample gas branch 311 and the reference gas branch 312. Of course, the gas circuit board is not limited to being made of acrylic and can also be made of other materials, such as plastic or metal.

[0034] In this embodiment, by configuring the gas circuit assembly 31 as an integrated gas circuit plate, the diameters of the sample gas branch 311 and the reference gas branch 312 can be made smaller, thereby effectively reducing the size of the gas circuit assembly 31 and making the size of the paramagnetic oxygen sensor 30 smaller, making it suitable for use in a ventilation device 100 with a small installation space.

[0035] Of course, the gas circuit assembly 31 is not limited to the above-mentioned configuration. For example, in some other embodiments, the gas circuit assembly 31 may also be formed by connecting and assembling a plurality of pipelines.

[0036] like Figure 2 As shown, in some embodiments, the gas circuit assembly 31 includes a first side 31a and a second side 31b opposite the first side 31a. The first pipeline 341 and the second pipeline 342 are disposed on the first side 31a of the gas circuit assembly 31, and the third pipeline 343 and the fourth pipeline 344 are disposed on the second side 31b of the gas circuit assembly 31. With this design, the first pipeline 341 and the second pipeline 342 do not interfere with the third pipeline 343 and the fourth pipeline 344. The first pipeline 341, the second pipeline 342, the third pipeline 343, and the fourth pipeline 344 have fewer bends, which reduces gas loss and improves the accuracy of the detection results.

[0037] In some embodiments, the electromagnet assembly 32 is disposed on the first side 31a of the gas circuit assembly 31, and the measurement board assembly 33 is disposed on the second side 31b of the gas circuit assembly 31. This arrangement effectively utilizes space, making the layout of the gas circuit assembly 31, the electromagnet assembly 32, and the measurement board assembly 33 more compact, and effectively reducing the size of the paramagnetic oxygen sensor 30.

[0038] like Figure 2 As shown, in some embodiments, the gas circuit assembly 31 includes a first extension section 31d and a second extension section 31e. The second extension section 31e is connected to the first extension section 31d to form a first angle. The electromagnet assembly 32 is located in the area enclosed by the first and second extension sections 31d, 31e, based on the first angle. The measurement plate assembly 33 is located on the side of the first extension section 31d facing away from the electromagnet assembly 32. This design allows for efficient space utilization, resulting in a more compact layout of the gas circuit assembly 31 and the electromagnet assembly 32, and reducing the size of the paramagnetic oxygen sensor 30. Optionally, the first and second extension sections 31d, 31e are perpendicular to each other.

[0039] Of course, the first extending section 31d and the second extending section 31e may also be configured to extend in the same direction.

[0040] In some embodiments, the first pipeline 341, the second pipeline 342, the third pipeline 343, and the fourth pipeline 344 are flexible tubes. This design reduces the installation precision requirements for the flexible tubes, thereby reducing the machining precision of the air circuit assembly 31, the electromagnet assembly 32, and the measurement board assembly 33. Of course, the first pipeline 341, the second pipeline 342, the third pipeline 343, and the fourth pipeline 344 can also be configured as rigid tubes.

[0041] like Figure 2As shown, in some embodiments, the electromagnet assembly 32 includes an iron core 322 and a coil 323. The iron core 322 includes a first magnetic pole 3221 and a second magnetic pole 3222. The first magnetic pole 3221 and the second magnetic pole 3222 are separated to form an air gap 321. The coil 323 is wound around the iron core 322. When the coil 323 is energized, a magnetic field is generated in the air gap 321. The first and second pipes 341, 342 can guide the sample gas and the reference gas to the air gap 321 via other adapter components. Of course, the first and second pipes 341, 342 can also extend directly to the air gap 321 to directly deliver the sample gas and the reference gas to the air gap 321.

[0042] like Figures 3 to 5 As shown, in some embodiments, the ventilation device 100 further includes a main control board 40, which is electrically connected to the measurement board 331. The main control board 40 is used for power supply control and external communication of the paramagnetic oxygen sensor 30. The air circuit assembly 31 further includes a third side 31c connecting the first side 31a and the second side 31b, and the main control board 40 is located on the third side 31c of the air circuit assembly 31. By locating the main control board 40 on the third side 31c of the air circuit assembly 31, space can be effectively utilized, resulting in a compact layout among the air circuit assembly 31, the electromagnet assembly 32, the measurement board 331, and the main control board 40, thereby effectively reducing the size of the paramagnetic oxygen sensor 30.

[0043] In some embodiments, the measurement board 331 and the main control board 40 are two separate PCBs (Printed Circuit Boards), connected by a flat cable. In other embodiments, the measurement board 331 and the main control board 40 may be an integrated PCB. In still other embodiments, the measurement board 331 and the main control board 40 may be an integrated flexible printed circuit board.

[0044] In some embodiments, the paramagnetic oxygen sensor 30 further includes a housing 35 , one side of which is open and covered by a main control board 40 . The air path assembly 31 , the electromagnet assembly 32 , and the measurement board assembly 33 are enclosed within an inner cavity 351 formed by the housing 35 and the main control board 40 . In other words, the main control board 40 functions as a cover to seal the open portion. This design effectively utilizes the main control board 40, eliminating the need for a separate cover. This effectively reduces the size of the paramagnetic oxygen sensor 30 and allows it to be installed in smaller spaces. Furthermore, since the main control board 40 is exposed, it facilitates the dissipation of heat generated during operation. Alternatively, the main control board 40 can be positioned within the housing 35 , with a separate cover to seal the open portion.

[0045] In some embodiments, the shell 35 is provided with a sample gas inlet 352, a reference gas inlet 353 and an air outlet 354. The sample gas inlet 352 is connected to the sample gas branch 311, the reference gas inlet 353 is connected to the reference gas branch 312, and the air outlet 354 is connected to the inner cavity 351. The sample gas and the reference gas are mixed at the air gap 321 and diffuse into the inner cavity 351 and diffuse out from the air outlet 354.

[0046] like Figure 3 and Figure 6 As shown, in some embodiments, the ventilation device 100 further includes a first air inlet pipe 101, a second air inlet pipe 102, and an air outlet pipe 103. The first air inlet pipe 101 connects the inhalation branch 10 and the sample gas inlet 352. One end of the second air inlet pipe 102 connects to the reference gas inlet 353, and the other end of the second air inlet pipe connects to the atmosphere. The air outlet pipe 103 connects the air outlet 354 and the inhalation branch 10. Optionally, a first gas delivery device 104 is installed in the first air inlet pipe 101, and a second gas delivery device 105 is installed in the second air inlet pipe 102. When the ventilation device 100 is in operation, the first gas delivery device 104 drives a portion of the sample gas from the inhalation branch 10 into the sample gas branch 311, and the second gas delivery device 105 delivers reference gas from the atmosphere into the reference gas branch 312. After the sample gas and reference gas are mixed at the air gap 321, they return to the inhalation branch 10 through the air outlet pipe 103.

[0047] It should be noted that the configuration is not limited to the above. For example, in some other embodiments, in addition to the first gas delivery device 104 being installed on the first gas inlet pipe 101, the second gas delivery device 105 is installed on the second gas inlet pipe 102, and the third gas delivery device 106 is installed on the gas outlet pipe 103. Alternatively, the first gas delivery device 104 is not installed on the first gas inlet pipe 101, the second gas delivery device 105 is not installed on the second gas inlet pipe 102, and only the third gas delivery device 106 is installed on the gas outlet pipe 103.

[0048] The embodiment of the present invention further provides a paramagnetic gas sensor for detecting the concentration of paramagnetic gas. The structure of the proposed paramagnetic gas sensor can refer to the above-mentioned paramagnetic oxygen sensor 30 and will not be described in detail here.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A ventilation device, characterized in that: The device comprises an inspiratory branch, an expiratory branch, and a paramagnetic oxygen sensor, wherein the inspiratory branch is used to supply fresh gas to the patient, the expiratory branch is used to receive gas exhaled by the patient, the paramagnetic oxygen sensor is connected to the inspiratory branch or the expiratory branch, and is used to detect the oxygen content of the gas in the inspiratory branch or the expiratory branch, wherein the paramagnetic oxygen sensor comprises: A gas circuit assembly, comprising a sample gas branch and a reference gas branch, wherein the sample gas branch is used to transport the sample gas to be detected, and the reference gas branch is used to transport the reference gas; an electromagnet assembly for forming an air gap having a magnetic field; a measurement board assembly, comprising a measurement board, a first microphone and a second microphone, wherein the first microphone and the second microphone are electrically connected to the measurement board; a pipeline assembly comprising a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, wherein the first pipeline is used to guide the sample gas from the sample gas branch to the air gap, the second pipeline is used to guide the reference gas from the reference gas branch to the air gap to mix with the sample gas, the third pipeline connects the first pipeline and the first microphone, the first microphone is used to detect the air pressure of the first pipeline, and the fourth pipeline connects the second pipeline and the second microphone, the second microphone is used to detect the air pressure of the second pipeline; Wherein, the measuring plate assembly is located outside the line connecting any point on the electromagnet assembly and any point on the gas path assembly; The gas circuit assembly includes a first side and a second side opposite to the first side. The first pipeline and the second pipeline are arranged on the first side of the gas circuit assembly. The third pipeline and the fourth pipeline are arranged on the second side of the gas circuit assembly.

2. The ventilation device according to claim 1, characterized in that The gas circuit assembly comprises: first extension; a second extension section connected to the first extension section to form a first angle; The electromagnet assembly is located in a region enclosed by the first extension segment and the second extension segment based on the first angle, and the measuring plate assembly is located on a side of the first extension segment facing away from the electromagnet assembly.

3. The ventilation device according to claim 1, wherein The first pipeline, the second pipeline, the third pipeline, and the fourth pipeline are hoses.

4. The ventilation device according to claim 1, wherein The gas circuit assembly includes an integrated gas circuit plate, and the integrated gas circuit plate includes the sample gas branch and the reference gas branch.

5. The ventilation device according to claim 1, wherein The ventilation device also includes: A main control board, electrically connected to the measurement board, and used for power supply control and external communication of the paramagnetic oxygen sensor; The gas circuit assembly further includes a third side connecting the first side and the second side, and the main control board is located on the third side of the gas circuit assembly.

6. The ventilation device according to claim 5, characterized in that The paramagnetic oxygen sensor further includes a shell, one side of which is open and the main control board covers the open portion. The air path assembly, the electromagnet assembly, and the measurement board assembly are enclosed in an inner cavity formed by the shell and the main control board.

7. The ventilation device according to claim 6, characterized in that The shell is provided with a sample gas inlet, a reference gas inlet and an air outlet. The sample gas inlet is connected to the sample gas branch, the reference gas inlet is connected to the reference gas branch, and the air outlet is connected to the inner cavity. The sample gas and the reference gas are mixed at the air gap and diffuse into the inner cavity and diffuse out from the air outlet.

8. A paramagnetic gas sensor, characterized in that: include: A gas circuit assembly, comprising a sample gas branch and a reference gas branch, wherein the sample gas branch is used to transport the sample gas to be detected, and the reference gas branch is used to transport the reference gas; an electromagnet assembly for forming an air gap having a magnetic field; a measurement board assembly, comprising a measurement board, a first microphone and a second microphone, wherein the first microphone and the second microphone are electrically connected to the measurement board; a pipeline assembly comprising a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, wherein the first pipeline is used to guide the sample gas from the sample gas branch to the air gap, the second pipeline is used to guide the reference gas from the reference gas branch to the air gap to mix with the sample gas, the third pipeline connects the first pipeline and the first microphone, the first microphone is used to detect the air pressure of the first pipeline, and the fourth pipeline connects the second pipeline and the second microphone, the second microphone is used to detect the air pressure of the second pipeline; Wherein, the measuring plate assembly is located outside the line connecting any point on the electromagnet assembly and any point on the gas path assembly; The gas circuit assembly includes a first side and a second side opposite to the first side. The first pipeline and the second pipeline are arranged on the first side of the gas circuit assembly. The third pipeline and the fourth pipeline are arranged on the second side of the gas circuit assembly.

9. The paramagnetic gas sensor according to claim 8, wherein: The air path assembly includes a first extension section and a second extension section, the second extension section is connected to the first extension section to form a first angle, the electromagnet assembly is located in an area enclosed by the first extension section and the second extension section based on the first angle, and the measuring plate assembly is located on a side of the first extension section facing away from the electromagnet assembly.

10. The paramagnetic gas sensor according to claim 8, wherein: The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are hoses.

11. The paramagnetic gas sensor according to claim 8, wherein: The gas circuit assembly includes an integrated gas circuit plate, and the integrated gas circuit plate includes the sample gas branch and the reference gas branch.

12. The paramagnetic gas sensor according to claim 8, wherein Also includes: A main control board, electrically connected to the measurement board, and used for power supply control and external communication of the paramagnetic gas sensor; The gas circuit assembly further includes a third side connecting the first side and the second side, and the main control board is located on the third side of the gas circuit assembly.

13. The paramagnetic gas sensor according to claim 12, wherein: It also includes a shell, one side of the shell is open, the main control board covers the opening, and the air path assembly, the electromagnet assembly and the measuring board assembly are enclosed in an inner cavity formed by the shell and the main control board.

14. The paramagnetic gas sensor according to claim 13, wherein: The shell is provided with a sample gas inlet, a reference gas inlet and an air outlet. The sample gas inlet is connected to the sample gas branch, the reference gas inlet is connected to the reference gas branch, and the air outlet is connected to the inner cavity. The sample gas and the reference gas are mixed at the air gap and diffuse into the inner cavity and diffuse out from the air outlet.

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