A proportional valve and constant current module

Abstract

The application belongs to the technical field of medical apparatuses, and discloses a proportional valve and a constant flow module, wherein the proportional valve comprises a valve seat, a valve core and a driving piece, the valve seat has a medium channel, the medium channel comprises an inlet section, an outlet section and a communication section communicating the inlet section and the outlet section, the valve core is connected to the valve seat, and the valve core has an adjusting part and a connecting part, the adjusting part can extend into the communication section, and the driving piece is connected to the connecting part and is used for driving the valve core to move to adjust the flow area of the communication section, and then when the proportional valve in the application is applied to a nitric oxide breath analyzer, the driving piece can be used to drive the valve core, the adjusting part of the valve core can be used to adjust the flow area of the communication section, the flow of the exhaled gas of a patient can be adjusted, and the detection efficiency of the nitric oxide breath analyzer and the detection experience of the patient are improved.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, specifically relating to a proportional valve and a constant current module. Background Technology

[0002] With the development of medical technology, nitric oxide breath analyzers are becoming increasingly popular for detecting respiratory inflammation. They can reflect the inflammation status of different parts of the patient by detecting parameters such as FeNO50 and FeNO200. The FeNO50 parameter can reflect the inflammation status of the patient's large airways, while the FeNO200 parameter can reflect the inflammation status of the patient's small airways.

[0003] When measuring FeNO50, sampling is required within an oral expiratory flow rate range of 50 mL / s ± 10%; while for FeNO200, sampling is required within an oral expiratory flow rate range of 200 mL / s ± 10%. This necessitates patients controlling their expiratory force to meet the flow rate requirements for these two parameters. However, most patients cannot effectively control their expiratory force, requiring multiple exhalations to complete the oral expiratory flow sample collection, thus affecting the detection efficiency of the nitric oxide breath analyzer. Furthermore, for patients with weak expiratory force control, FeNO50 and FeNO200 parameters cannot be measured, impacting the patient's testing experience. Therefore, adjusting the patient's expiratory flow rate is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a proportional valve for adjusting the expiratory flow rate of a patient.

[0005] The technical solution adopted in this application is as follows:

[0006] A proportional valve, comprising:

[0007] A valve seat having a medium passage, the medium passage including an inlet section, an outlet section, and a connecting section connecting the inlet section and the outlet section;

[0008] A valve core, which is connected to the valve seat, and has an adjusting part and a connecting part, wherein the adjusting part can extend into the communicating section;

[0009] A driving component, which is connected to the connecting portion and is used to drive the valve core to move in order to adjust the flow area of ​​the connecting section.

[0010] By adopting the above technical solution, when using the proportional valve in this application, the inlet section and outlet section are connected to the tubing of the nitric oxide breath analyzer, so that the patient's exhaled gas first enters the tubing of the nitric oxide breath analyzer, and then returns to the tubing of the nitric oxide breath analyzer through the medium channel. That is, the patient's exhaled gas first enters the inlet section through the tubing of the nitric oxide breath analyzer, then enters the connecting section through the inlet section, then enters the outlet section through the connecting section, and finally enters the tubing of the nitric oxide breath analyzer through the outlet section. When adjusting the flow rate of the patient's exhaled gas, the driving component is activated to drive the valve core to move, thereby changing the depth of the adjusting part inserted into the connecting section, so as to adjust the flow area of ​​the connecting section, and thus realize the adjustment of the flow rate of the patient's exhaled gas.

[0011] In summary, the nitric oxide breath analyzer equipped with the proportional valve described in this application can drive the valve core through a driving component, thereby adjusting the flow area of ​​the connecting section and thus regulating the flow rate of the patient's exhaled gas. This reduces the requirement for the patient to control the force of exhalation when measuring FeNO50 and FeNO200 parameters, thereby improving the detection efficiency of the nitric oxide breath analyzer. Furthermore, it expands the user base of the nitric oxide breath analyzer, thereby improving the patient's testing experience and stabilizing their anxiety during medical visits.

[0012] Optionally, the valve core is coaxially arranged with the connecting section, and the diameter of the adjusting part is gradually reduced in the direction away from the connecting part.

[0013] By adopting the above technical solution, since the diameter of the adjusting part gradually decreases along the direction away from the connecting part, the flow area of ​​the connecting section gradually decreases as the depth of the adjusting part extending into the connecting section gradually increases, thereby gradually increasing the flow rate of the patient's exhaled gas. Conversely, as the depth of the adjusting part extending into the connecting section gradually decreases, the flow area of ​​the connecting section gradually increases, thereby gradually increasing the flow rate of the patient's exhaled gas. This achieves regulation of the patient's exhaled gas flow rate by changing the depth of the adjusting part extending into the connecting section. Furthermore, since the valve core is coaxially arranged with the connecting section, on the one hand, when the adjusting part extends into the connecting section, the inner wall of the connecting section can guide the adjusting part, increasing its stability; on the other hand, it can reduce the volume of the proportional valve, facilitating miniaturization of the proportional valve design.

[0014] Optionally, the connecting segment includes a first segment and a second segment with an inner diameter smaller than that of the first segment. The second segment is located at the end of the adjusting part away from the connecting part, and the diameter of the adjusting part at the end away from the connecting part is smaller than the inner diameter of the second segment.

[0015] By adopting the above technical solution, since the inner diameter of the second section is smaller than that of the first section, the second section is located at the end of the adjustment part away from the connection part, and the diameter of the end of the adjustment part away from the connection part is smaller than that of the second section, the movement stroke of the valve core is shortened while ensuring the adjustment range of the flow area of ​​the connecting section, so as to enable the valve core to be miniaturized, thereby achieving the effect of facilitating the miniaturization design of the proportional valve.

[0016] Optionally, the inlet section is connected to the first section, and the outlet section is connected to the second section.

[0017] By adopting the above technical solution, since the inlet section is connected to the first section and the outlet section is connected to the second section, the diameter of the regulating part gradually decreases from the inlet section to the outlet section. As a result, when the gas enters the connecting section through the inlet section, the outer peripheral surface of the regulating part can guide the gas, so that the gas can enter the connecting section more smoothly, thereby reducing the patient's expiratory resistance and improving the patient's testing experience.

[0018] Optionally, the medium channel further includes a guide section, which is connected to the connecting section, and at least a portion of the connecting portion is located in the guide section.

[0019] By adopting the above technical solution, since the guide section and the connecting section are connected, at least part of the connecting part is located in the guide section. Then, when the valve core and the valve seat slide relative to each other, the valve core can be guided by the cooperation of the connecting part and the guide section, so as to increase the stability of the valve core movement.

[0020] Optionally, the outer peripheral surface of the connecting part is provided with a limiting groove, and the connecting part is provided with a sealing member sleeved in the limiting groove, the sealing member being located inside the guide section.

[0021] By adopting the above technical solution, since the connecting part is equipped with a sealing element fitted in the limiting groove and the sealing element is located inside the guide section, on the one hand, the sealing element can be used to seal the gap between the connecting part and the guide section to ensure the sealing performance of the guide section, thereby avoiding noise caused by air leakage between the connecting part and the guide section, thus reducing the noise generated by the nitric oxide breath analyzer during operation. On the other hand, the groove wall of the limiting groove can also be used to limit the sealing element, thereby increasing the connection stability between the sealing element and the connecting part, and further ensuring the sealing effect of the sealing element on the guide section.

[0022] Optionally, the outer peripheral surface of the connecting part is provided with a plurality of mating teeth along the axial direction of the valve core, the driving component includes a stepper motor and a driving gear, the driving gear is meshed and transmitted with the mating teeth, and the output shaft of the stepper motor is transmittedly connected to the driving gear.

[0023] By adopting the above technical solution, when adjusting the flow area of ​​the connecting section, the stepper motor is started so that the output shaft of the stepper motor drives the drive gear to rotate. Since the drive gear is meshed with the mating gear, the drive gear can drive the valve core to move under the action of the mating gear, so that the depth of the adjustment part inserted into the connecting section changes, thereby realizing the adjustment of the flow area of ​​the connecting section.

[0024] By setting the driving component as a stepper motor and a driving gear, the driving component can drive the valve core to move, and the driving accuracy of the driving component to the valve core is improved. This improves the adjustment accuracy of the valve core to the flow area of ​​the connecting section, thereby improving the adjustment accuracy of the nitric oxide breath analyzer to the patient's expiratory flow rate, and thus improving the detection accuracy of the nitric oxide breath analyzer.

[0025] Optionally, the proportional valve further includes a gearbox, wherein the rotational speed of the input shaft of the gearbox is greater than the rotational speed of the output shaft of the gearbox, the output shaft of the stepper motor is drivenly connected to the input shaft of the gearbox, and the output shaft of the gearbox is drivenly connected to the drive gear;

[0026] And / or, the valve seat is provided with a guide wall located outside the connecting part, the guide wall is provided with a guide ring sleeved outside the connecting part, and the drive gear is located between the valve seat and the guide ring.

[0027] By adopting the above technical solution, since the speed of the input shaft of the gearbox is greater than the speed of the output shaft of the gearbox, the output shaft of the stepper motor is driven and connected to the input shaft of the gearbox, and the output shaft of the gearbox is driven and connected to the drive gear. In this way, the speed of the drive gear can be reduced by using the gearbox, so as to further improve the driving accuracy of the valve core, thereby further improving the adjustment accuracy of the valve core on the flow area of ​​the connecting section, and further improving the adjustment accuracy of the nitric oxide breath analyzer on the patient's expiratory flow rate.

[0028] Because the valve seat is provided with a guide wall located outside the connecting part, and the guide wall is provided with a guide ring sleeved outside the connecting part, the valve core can be guided by the cooperation between the guide wall and the guide ring and the connecting part when the valve core moves, thereby increasing the stability of the valve core movement; and because the drive gear is located between the valve seat and the guide ring, the drive gear can avoid the guide ring, thereby ensuring that the drive gear can mesh with the mating gear for transmission.

[0029] Optionally, the proportional valve further includes a mounting base, wherein the valve seat and the drive component are both disposed on the mounting base.

[0030] By adopting the above technical solution, since both the valve seat and the drive component are located on the mounting base, the valve seat and the drive component are integrated together. On the one hand, this increases the stability of the proportional valve, and on the other hand, it reduces the difficulty of installing the proportional valve into the nitric oxide breath analyzer, thereby improving the installation efficiency of the proportional valve.

[0031] Optionally, the proportional valve further includes a photoelectric sensor, and the valve core further includes a trigger portion disposed at the connection portion, the trigger portion being capable of triggering the photoelectric sensor.

[0032] By adopting the above technical solution, since the proportional valve also includes a photoelectric sensor and the valve core also includes a trigger part located in the connection part, the trigger part can trigger the photoelectric sensor, and then set the trigger position of the photoelectric sensor to the initial position, so as to facilitate the reset and correction of the valve core, thereby ensuring the control accuracy of the valve core, ensuring the adjustment accuracy of the flow area of ​​the connecting section by the valve core, and thus ensuring the detection accuracy of the nitric oxide breath analyzer. At the same time, it can also simplify the control logic of the driving component to ensure the stable operation of the proportional valve.

[0033] Optionally, the proportional valve further includes a mounting base and a proportional valve circuit board disposed on the mounting base, and the photoelectric sensor is disposed on the proportional valve circuit board.

[0034] By adopting the above technical solution, since the photoelectric sensor is located on the proportional valve circuit board, the photoelectric sensor is integrated into the proportional valve circuit board. On the one hand, this reduces the difficulty of electrical connection between the photoelectric sensor and the proportional valve circuit board, and on the other hand, it increases the structural compactness of the proportional valve, so as to facilitate the miniaturization design of the proportional valve. Furthermore, since the proportional valve circuit board is located on the mounting base, the proportional valve circuit board is integrated into the mounting base, which further increases the structural compactness of the proportional valve, and further facilitates the miniaturization design of the proportional valve.

[0035] Optionally, the proportional valve circuit board has a connecting lug, and the mounting base has a positioning rib located on the side of the connecting lug;

[0036] And / or, the valve seat is provided with a guide ring sleeved on the outside of the connecting part, the proportional valve circuit board is located between the guide ring and the mounting base, and the guide ring is provided with a clearance notch to avoid the proportional valve circuit board.

[0037] By adopting the above technical solution, since the proportional valve circuit board has a connecting ear and the mounting base has a positioning rib located on the side of the connecting ear, on the one hand, the positioning rib can be used to position the connecting ear to facilitate the accurate installation of the proportional valve circuit board, thereby reducing the installation difficulty of the proportional valve circuit board. On the other hand, the cooperation between the positioning rib and the connecting ear can be used to limit the proportional valve circuit board to increase the stability of the proportional valve circuit board and the photoelectric sensor, thereby ensuring the stable operation of the proportional valve.

[0038] Because the proportional valve circuit board is located between the guide ring and the mounting base, it can fully contact the mounting base, ensuring the contact area between the proportional valve circuit board and the mounting base, thereby increasing the connection stability between the proportional valve circuit board and the mounting base. Furthermore, because the guide ring is provided with a clearance notch to avoid the proportional valve circuit board, the distance between the valve core and the mounting base can be reduced, thereby increasing the structural compactness of the proportional valve and further facilitating the miniaturization design of the proportional valve.

[0039] This application also provides a constant flow module for regulating the patient's expiratory flow rate.

[0040] A constant flow module includes an intake pipe, a pressure sensor connected to the intake pipe, a flow sensor connected to the intake pipe, and a proportional valve as described above, wherein the inlet section of the proportional valve is connected to the outlet of the flow sensor.

[0041] By adopting the above technical solution, when using the constant flow module in this application, the inlet pipe is connected to the pipe of the nitric oxide breath analyzer, and the outlet section of the proportional valve is connected to the pipe of the nitric oxide breath analyzer. This allows the patient's exhaled gas to first enter the inlet pipe. Then, part of the gas entering the inlet pipe enters the pressure sensor to detect the pressure of the patient's exhaled gas, and the other part enters the flow sensor to detect the flow rate of the patient's exhaled gas. Then, based on the pressure of the patient's exhaled gas detected by the pressure sensor and the flow rate of the patient's exhaled gas detected by the flow sensor, the proportional valve is adjusted. This allows the proportional valve to adjust the patient's exhaled gas to the set flow rate, thereby reducing the difficulty for patients to measure FeNO50 and FeNO200 parameters and improving the patient's testing experience.

[0042] Optionally, the constant flow module further includes a control circuit board, the pressure sensor is disposed on the control circuit board, and the control circuit board is electrically connected to the flow sensor;

[0043] And / or, the constant flow module further includes a solenoid valve, the inlet of which is connected to the outlet of the flow sensor or to the outlet section of the proportional valve.

[0044] By adopting the above technical solution, since the pressure sensor is located on the control circuit board, the difficulty of electrical connection between the pressure sensor and the control circuit board is reduced, thereby reducing the manufacturing difficulty of the proportional valve. On the other hand, the pressure sensor is integrated into the control circuit board, which increases the structural compactness of the constant current module, thereby facilitating the miniaturization design of the constant current module.

[0045] Since the inlet of the solenoid valve is connected to the outlet of the flow sensor or the outlet section of the proportional valve, when the patient exhales, the solenoid valve can be opened to allow part of the patient's exhaled air to be directly discharged into the air, thereby reducing the patient's exhalation resistance, reducing the difficulty of exhalation, improving the smoothness of exhalation, and further improving the patient's testing experience.

[0046] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0047] 1. The proportional valve in this application includes a valve seat, a valve core, and a driving component. The valve seat has a medium channel, which includes an inlet section, an outlet section, and a connecting section connecting the inlet and outlet sections. The valve core is connected to the valve seat and has an adjusting part and a connecting part. The adjusting part can extend into the connecting section. The driving component is connected to the connecting part and is used to drive the valve core to move and adjust the flow area of ​​the connecting section. This allows the nitric oxide breath analyzer equipped with the proportional valve in this application to drive the valve core through the driving component, thereby adjusting the flow area of ​​the connecting section and regulating the flow rate of the patient's exhaled gas. This reduces the requirement for the patient to control the exhalation force when using the nitric oxide breath analyzer, thus reducing the number of exhalations during the measurement of FeNO50 and FeNO200 parameters, thereby improving the detection efficiency of the nitric oxide breath analyzer. Furthermore, it increases the number of users of the nitric oxide breath analyzer, thereby improving the patient's testing experience and stabilizing the patient's mood during medical visits.

[0048] 2. In this application, the valve core and the connecting section are coaxially arranged, and the diameter of the adjusting part gradually decreases in the direction away from the connecting part. As the depth of the adjusting part extending into the connecting section gradually increases, the flow area of ​​the connecting section gradually decreases, thereby increasing the flow rate of the patient's exhaled gas. Conversely, as the depth of the adjusting part extending into the connecting section gradually decreases, the flow area of ​​the connecting section gradually increases, thereby increasing the flow rate of the patient's exhaled gas. Thus, the flow rate of the patient's exhaled gas is adjusted by changing the depth of the adjusting part extending into the connecting section.

[0049] 3. The connecting section in this application includes a first section and a second section with an inner diameter smaller than that of the first section. The second section is located at the end of the adjusting part away from the connecting part, and the diameter of the end of the adjusting part away from the connecting part is smaller than the inner diameter of the second section. Thus, while ensuring the adjustment range of the flow area of ​​the connecting section, the movement stroke of the valve core is shortened, so that the valve core can be miniaturized, thereby achieving the effect of facilitating the miniaturization design of the proportional valve. Attached Figure Description

[0050] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0051] Figure 1 This is a schematic diagram of the proportional valve described in one embodiment of this application;

[0052] Figure 2 This is a schematic diagram of the proportional valve described in one embodiment of this application from another perspective.

[0053] Figure 3 This is an exploded view of the proportional valve described in one embodiment of this application;

[0054] Figure 4 This is a cross-sectional view of the valve seat described in one embodiment of this application;

[0055] Figure 5 This is a schematic diagram showing the connection relationship between the valve core and the valve seat in one embodiment of this application;

[0056] Figure 6 This is a schematic diagram of the valve seat structure in one embodiment of this application;

[0057] Figure 7 This is a schematic diagram of the structure of the mounting base according to one embodiment of this application;

[0058] Figure 8 This is a schematic diagram of the proportional valve circuit board in one embodiment of this application;

[0059] Figure 9 This is a schematic diagram of the constant current module described in one embodiment of this application;

[0060] Figure 10 This is a schematic diagram of the constant current module described in another embodiment of this application.

[0061] Figure label:

[0062] 1. Valve seat; 11. Medium passage; 111. Inlet section; 112. Outlet section; 113. Connecting section; 114. Guide section; 115. First section; 116. Second section; 12. Guide wall; 121. Guide ring; 13. Mounting part; 131. Reinforcing rib; 2. Valve core; 21. Adjusting part; 22. Connecting part; 221. Limiting groove; 222. Seal; 223. Mating tooth; 23. Triggering part; 3. Driving component; 31. Stepper motor; 32. Drive gear; 4. Mounting base; 41. Edge; 42. Positioning rib; 5. Photoelectric sensor; 6. Proportional valve circuit board; 61. Connecting lug; 7. Pressure sensor; 8. Flow sensor; 9. Control circuit board; 91. Solenoid valve. Detailed Implementation

[0063] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0064] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0065] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0066] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0068] Reference Figures 1 to 8 A proportional valve is disclosed, comprising a valve seat 1, a valve core 2, and a drive member 3. The valve seat 1 has a medium channel 11, which includes an inlet section 111, an outlet section 112, and a connecting section 113 connecting the inlet section 111 and the outlet section 112. The valve core 2 is connected to the valve seat 1 and has an adjusting part 21 and a connecting part 22. The adjusting part 21 can extend into the connecting section 113. The drive member 3 is connected to the connecting part 22 and is used to drive the valve core 2 to move to adjust the flow area of ​​the connecting section 113.

[0069] It is understandable that the end of the inlet section 111 away from the connecting section 113 has an inlet, and the end of the outlet section 112 away from the connecting section 113 has an outlet; the valve core 2 can move relative to the connecting section 113 under the driving action of the driving member 3, so that the depth of the adjusting part 21 extending into the connecting section 113 changes, so that the adjusting part 21 adjusts the flow area of ​​the connecting section 113.

[0070] When using the proportional valve in this application, the inlet section 111 and outlet section 112 are connected to the tubing of the nitric oxide breath analyzer, so that the patient's exhaled gas first enters the tubing of the nitric oxide breath analyzer, and then returns to the tubing of the nitric oxide breath analyzer via the medium channel 11. That is, the patient's exhaled gas first enters the inlet section 111 through the tubing of the nitric oxide breath analyzer, then enters the connecting section 113 through the inlet section 111, then enters the outlet section 112 through the connecting section 113, and finally enters the tubing of the nitric oxide breath analyzer again through the outlet section 112. When adjusting the flow rate of the patient's exhaled gas, the drive unit 3 is activated, so that the drive unit 3 drives the valve core 2 to move, thereby changing the depth of the adjusting part 21 extending into the connecting section 113, so as to adjust the flow area of ​​the connecting section 113, and thus realize the adjustment of the flow rate of the patient's exhaled gas.

[0071] In summary, the nitric oxide breath analyzer equipped with the proportional valve described in this application can drive the valve core 2 via the drive component 3, thereby adjusting the flow area of ​​the connecting section 113 and thus regulating the flow rate of the patient's exhaled gas. This reduces the requirement for the patient to control the exhalation force when the nitric oxide breath analyzer is used, thereby reducing the number of exhalations during the measurement of FeNO50 and FeNO200 parameters and improving the detection efficiency of the nitric oxide breath analyzer. Furthermore, it expands the user base of the nitric oxide breath analyzer, thereby improving the patient's testing experience and stabilizing the patient's mood during the consultation.

[0072] This application does not impose specific limitations on the positional relationship between the valve core 2 and the connecting section 113, or on the structure of the adjusting part 21; any of the following embodiments may be adopted:

[0073] Implementation Method 1, in this implementation method, refer to Figure 4 The valve core 2 is coaxially arranged with the connecting section 113, and the diameter of the adjusting part 21 is gradually reduced in the direction away from the connecting part 22.

[0074] It is understood that in this embodiment, an angle is formed between the inlet section 111 and / or the outlet section 112 and the connecting section 113 so that the valve core 2 can be coaxially arranged with the connecting section 113.

[0075] Because the diameter of the regulating part 21 gradually decreases in the direction away from the connecting part 22, the depth of the regulating part 21 extending into the connecting section 113 gradually increases, and the flow area of ​​the connecting section 113 gradually decreases, thereby increasing the flow rate of the patient's exhaled gas. Conversely, when the depth of the regulating part 21 extending into the connecting section 113 gradually decreases, the flow area of ​​the connecting section 113 gradually increases, thereby increasing the flow rate of the patient's exhaled gas. Thus, the flow rate of the patient's exhaled gas is adjusted by changing the depth of the regulating part 21 extending into the connecting section 113.

[0076] Furthermore, since the valve core 2 and the connecting section 113 are coaxially arranged, on the one hand, when the adjusting part 21 extends into the connecting section 113, the inner wall of the connecting section 113 can guide the adjusting part 21 to increase the stability of the adjusting part 21. On the other hand, it can reduce the volume of the proportional valve to facilitate the miniaturization design of the proportional valve.

[0077] This application does not specifically limit the positional relationship between the inlet section 111 and the outlet section 112 and the connecting section 113. Preferably, refer to Figure 4The inlet section 111 and the outlet section 112 are both located on the same side of the connecting section 113, so that the inlet section 111 and the outlet section 112 can both avoid the regulating part 21, so as to ensure the regulating effect of the regulating part 21 on the flow area of ​​the connecting section 113. At the same time, the inlet and outlet positions of the proportional valve are both located on the same side of the valve seat 1, so as to facilitate the connection of the proportional valve with the pipeline of the nitric oxide breath analyzer.

[0078] The better one is to refer to Figure 4 The central axes of the inlet section 111 and the outlet section 112 are both set perpendicular to the central axis of the connecting section 113 to increase the structural compactness of the proportional valve, thereby facilitating the miniaturization design of the proportional valve.

[0079] In other embodiments, one of the inlet section 111 and the outlet section 112 may be located on the side of the connecting section 113, and the other of the two may be coaxially arranged with the connecting section 113.

[0080] This application does not specifically limit the structure of the connected segment 113; preferably, refer to... Figure 4 The connecting segment 113 includes a first segment 115 and a second segment 116 with an inner diameter smaller than that of the first segment 115. The second segment 116 is located at the end of the adjusting part 21 away from the connecting part 22, and the diameter of the end of the adjusting part 21 away from the connecting part 22 is smaller than the inner diameter of the second segment 116.

[0081] It is understandable that the diameter of the adjustment part 21 near the connecting part 22 is larger than the inner diameter of the second section 116.

[0082] Since the inner diameter of the second segment 116 is smaller than that of the first segment 115, the second segment 116 is located at the end of the adjusting part 21 away from the connecting part 22, and the diameter of the end of the adjusting part 21 away from the connecting part 22 is smaller than that of the second segment 116, the movement stroke of the valve core 2 is shortened while ensuring the adjustment range of the flow area of ​​the connecting section 113, so that the valve core 2 can be miniaturized, thereby achieving the effect of facilitating the miniaturization of the proportional valve.

[0083] Furthermore, refer to Figure 4 The inlet section 111 connects to the first section 115, and the outlet section 112 connects to the second section 116.

[0084] It is understandable that the diameter of the adjustment section 21 is set to gradually decrease along the direction from the first section 115 to the second section 116.

[0085] Since the inlet section 111 is connected to the first section 115 and the outlet section 112 is connected to the second section 116, the diameter of the regulating section 21 gradually decreases from the inlet section 111 to the outlet section 112. As a result, when the gas enters the connecting section 113 through the inlet section 111, the outer peripheral surface of the regulating section 21 can guide the gas so that the gas can enter the connecting section 113 more smoothly, thereby reducing the patient's expiratory resistance and improving the patient's testing experience.

[0086] In other embodiments, the design of the second segment 116 may be omitted so that the diameter of the connecting segment 113 remains constant along the axial direction of the connecting segment 113.

[0087] In the second embodiment, the central axis of the adjusting part 21 is set perpendicular to the central axis of the connecting section 113, so that the valve core 2 moves in a direction perpendicular to the central axis of the connecting section 113 to adjust the flow area of ​​the connecting section 113.

[0088] In this embodiment, the positional relationship between the inlet section 111 and the outlet section 112 and the connecting section 113 is not specifically limited. Both the inlet section 111 and the outlet section 112 can be coaxially arranged with the connecting section 113. They can both be located on the side of the connecting section 113, or one of them can be coaxially arranged with the connecting section 113 and the other one can be located on the side of the connecting section 113.

[0089] In this embodiment, the structure of the adjustment part 21 is not specifically limited. It can be a columnar structure with a constant diameter, or it can be a structure with a diameter that gradually decreases in the direction away from the connecting part 22.

[0090] In a preferred embodiment, refer to Figure 4 The medium channel 11 also includes a guide section 114, which is connected to the connecting section 113, and at least a portion of the connecting part 22 is located in the guide section 114.

[0091] It should be noted that in the above-mentioned scheme where the valve core 2 and the connecting section 113 are coaxially arranged, the guide section 114 is coaxially arranged with the connecting section 113; in the above-mentioned scheme where the central axis of the adjusting part 21 is perpendicular to the central axis of the connecting section 113, the central axis of the guide section 114 is perpendicular to the central axis of the connecting section 113.

[0092] Since the guide section 114 is connected to the connecting section 113, at least a portion of the connecting part 22 is located in the guide section 114. When the valve core 2 and the valve seat 1 slide relative to each other, the valve core 2 can be guided by the cooperation of the connecting part 22 and the guide section 114, thereby increasing the stability of the valve core 2 during movement.

[0093] Furthermore, refer to Figure 3 and Figure 4 The outer peripheral surface of the connecting part 22 is provided with a limiting groove 221, and the connecting part 22 is provided with a sealing member 222 sleeved in the limiting groove 221. The sealing member 222 is located inside the guide section 114.

[0094] It is understood that the limiting groove 221 is an annular groove that extends circumferentially along the connecting part 22, and the outer peripheral surface of the sealing member 222 contacts the inner wall of the guide section 114 so as to seal the gap between the connecting part 22 and the guide section 114 by using the sealing member 222.

[0095] Since the connecting part 22 is provided with a sealing element 222 sleeved in the limiting groove 221, and the sealing element 222 is located inside the guide section 114, the sealing element 222 can seal the gap between the connecting part 22 and the guide section 114 to ensure the sealing performance of the guide section 114, thereby avoiding noise caused by air leakage due to the gap between the connecting part 22 and the guide section 114, thus reducing the noise generated when the nitric oxide breath analyzer is working. On the other hand, the groove wall of the limiting groove 221 can limit the sealing element 222 to increase the connection stability between the sealing element 222 and the connecting part 22, thereby further ensuring the sealing effect of the sealing element 222 on the guide section 114.

[0096] This application does not specifically limit the structure of the seal 222. Preferably, the seal 222 is a sealing ring, which reduces the friction between the connecting part 22 and the guide section 114 while ensuring the sealing effect of the seal 222 on the gap between the connecting part 22 and the guide section 114, thereby reducing the driving load of the driving member 3. In other embodiments, the seal 222 can also be a sealing gasket with a circular cross-section.

[0097] Of course, in other embodiments, the design of the limiting groove 221 can be omitted, or the limiting groove 221 can be located on the inner wall of the guide section 114.

[0098] This application does not impose specific limitations on the structure of the driving component 3, which can adopt any of the following embodiments:

[0099] Implementation Method 1, in this implementation method, refer to Figures 1 to 5 The outer peripheral surface of the connecting part 22 is provided with a plurality of mating teeth 223 along the axial direction of the valve core 2. The driving component 3 includes a stepper motor 31 and a driving gear 32. The driving gear 32 is meshed with the mating teeth 223 for transmission. The output shaft of the stepper motor 31 is transmitted to the driving gear 32.

[0100] When adjusting the flow area of ​​the connecting section 113, the stepper motor 31 is started so that the output shaft of the stepper motor 31 drives the drive gear 32 to rotate. Since the drive gear 32 is meshed with the mating gear 223, the drive gear 32 can drive the valve core 2 to move under the action of the mating gear 223, so that the depth of the adjusting part 21 extending into the connecting section 113 changes, thereby realizing the adjustment of the flow area of ​​the connecting section 113.

[0101] By setting the driving component 3 as a stepper motor 31 and a driving gear 32, on the one hand, the driving component 3 can drive the valve core 2 to move, and on the other hand, the driving accuracy of the driving component 3 on the valve core 2 is improved, so as to improve the adjustment accuracy of the valve core 2 on the flow area of ​​the connecting section 113, thereby improving the adjustment accuracy of the nitric oxide breath analyzer on the patient's expiratory flow rate, and thus improving the detection accuracy of the nitric oxide breath analyzer.

[0102] This application does not specifically limit the formation method of the mating teeth 223. Preferably, the outer peripheral surface of the connecting part 22 is provided with multiple notches, and the mating teeth 223 are formed at the positions where the notches are provided in the connecting part 22, so as to reduce the difficulty of forming the mating teeth 223 and thereby reduce the manufacturing cost of the proportional valve. In other embodiments, the outer peripheral surface of the connecting part 22 is provided with a receiving groove, and the mating teeth 223 are tooth structures separately provided on the groove wall of the receiving groove.

[0103] This application does not impose specific limitations on the transmission connection method between the output shaft of the stepper motor 31 and the drive gear 32, which can be any one of the following embodiments:

[0104] Example 1, in this example, refers to Figure 3 The drive gear 32 is coaxially fixedly connected to the output shaft of the stepper motor 31 to increase the connection stability between the drive gear 32 and the stepper motor 31 and reduce the number of parts required to be assembled when assembling the proportional valve, thereby improving the production efficiency of the proportional valve.

[0105] Example 2: In this example, the proportional valve also includes a gearbox. The rotational speed of the input shaft of the gearbox is greater than the rotational speed of the output shaft of the gearbox. The output shaft of the stepper motor 31 is driven to the input shaft of the gearbox, and the output shaft of the gearbox is driven to the drive gear 32.

[0106] It is understood that the gearbox has an input shaft and an output shaft, which are connected by gear transmission, and the speed of the input shaft of the gearbox is greater than the speed of the output shaft of the gearbox; the output shaft of the stepper motor 31 is coaxially fixedly connected to the input shaft of the gearbox through a coupling, and the drive gear 32 is coaxially fixedly connected to the output shaft of the gearbox.

[0107] Since the input shaft of the gearbox rotates faster than the output shaft, the output shaft of the stepper motor 31 is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the drive gear 32. This allows the gearbox to reduce the speed of the drive gear 32, thereby further improving the driving accuracy of the valve core 2. This, in turn, further improves the adjustment accuracy of the valve core 2 on the flow area of ​​the connecting section 113, and further improves the adjustment accuracy of the nitric oxide breath analyzer on the patient's expiratory flow rate.

[0108] Furthermore, refer to Figure 6 The valve seat 1 is provided with a guide wall 12 located outside the connecting part 22. The guide wall 12 is provided with a guide ring 121 sleeved outside the connecting part 22. The drive gear 32 is located between the valve seat 1 and the guide ring 121.

[0109] It is understandable that the drive gear 32 and the guide wall 12 are located on both sides of the connecting part 22 so that the guide wall 12 and the drive gear 32 can avoid each other.

[0110] Since the valve seat 1 is provided with a guide wall 12 located outside the connecting part 22, and the guide wall 12 is provided with a guide ring 121 sleeved on the outside of the connecting part 22, the valve core 2 can be guided by the cooperation of the guide wall 12 and the guide ring 121 with the connecting part 22 when the valve core 2 moves, thereby increasing the stability of the valve core 2 movement; and since the drive gear 32 is located between the valve seat 1 and the guide ring 121, the drive gear 32 can avoid the guide ring 121, thereby ensuring that the drive gear 32 can mesh and transmit power with the mating gear 223.

[0111] In the second embodiment, the driving component 3 is either a cylinder or an electric actuator. The piston rod of the cylinder or electric actuator is coaxially arranged with the valve core 2, and the piston rod of the cylinder or electric actuator is fixedly connected to the connecting part 22 so as to drive the valve core 2 by the movement of the piston rod.

[0112] Of course, in other embodiments, a combination of a cylinder or an electric actuator and a rack can be used to replace the stepper motor 31 in the first embodiment above, so as to achieve the same driving of the valve core 2.

[0113] In a preferred embodiment, refer to Figures 1 to 3 The proportional valve also includes a mounting base 4, where the valve seat 1 and the drive component 3 are all located. This integrates the valve seat 1 and the drive component 3 together, which increases the stability of the proportional valve and reduces the difficulty of installing the proportional valve into the nitric oxide breath analyzer, thereby improving the installation efficiency of the proportional valve.

[0114] This application does not specifically limit the connection method between valve seat 1 and mounting base 4. Preferably, refer to... Figure 3 The valve seat 1 has a plate-shaped mounting part 13, which is fixedly connected to the mounting base 4 by screws, so as to facilitate the installation of the valve seat 1 on the mounting base 4 and increase the connection stability between the valve seat 1 and the mounting base 4.

[0115] The better one is to refer to Figure 3 and Figure 7 The mounting base 4 is provided with an edge 41 located around the mounting part 13. The side of the mounting part 13 abuts against the edge 41. On the one hand, the valve seat 1 can be positioned by the cooperation between the edge 41 and the mounting part 13, so as to facilitate the installation of the valve seat 1 on the mounting base 4. On the other hand, the valve seat 1 can be limited by the cooperation between the edge 41 and the mounting part 13, so as to increase the connection stability between the valve seat 1 and the mounting base 4.

[0116] The better one is to refer to Figure 6 The guide wall 12 is located on the side of the mounting part 13 away from the connecting section 113, and the mounting part 13 is provided with a reinforcing rib 131 connecting the guide wall 12 and the guide ring 121 to increase the stability of the guide wall 12 and the guide ring 121, thereby ensuring the guiding effect on the valve core 2.

[0117] In other embodiments, the valve seat 1 can also be fixedly connected to the mounting base 4 by adhesive bonding.

[0118] This application does not specifically limit the connection method between the drive component 3 and the mounting base 4. Preferably, the drive component 3 is fixedly connected to the mounting base 4 by screws, which reduces the difficulty of fixing the drive component 3 and increases the connection stability between the drive component 3 and the mounting base 4. In other embodiments, the drive component 3 can also be fixedly connected to the mounting base 4 by a bracket.

[0119] In a preferred embodiment, refer to Figures 1 to 3 The proportional valve also includes a photoelectric sensor 5, and the valve core 2 also includes a triggering part 23 located on the connecting part 22. The triggering part 23 can trigger the photoelectric sensor 5, and then set the triggering position of the photoelectric sensor 5 by the triggering part 23 as the initial position, so as to facilitate the reset and correction of the valve core 2, thereby ensuring the control accuracy of the valve core 2, ensuring the adjustment accuracy of the flow area of ​​the connecting section 113 by the valve core 2, and thus ensuring the detection accuracy of the nitric oxide breath analyzer. At the same time, it can also simplify the control logic of the driving component 3 to ensure the stable operation of the proportional valve.

[0120] Preferably, the initial position of the valve core 2 is defined as the position where the adjusting part 21 is completely disengaged from the connecting section 113, so as to facilitate the reset and correction of the valve core 2.

[0121] This application does not specifically limit the structure of the trigger part 23 or the structure of the photoelectric sensor 5. Preferably, the photoelectric sensor 5 includes a photoelectric emitter and a photoelectric receiver arranged opposite each other. The trigger part 23 is a sheet-like structure located at the end of the connecting part 22 away from the adjusting part 21, and there is a gap between the photoelectric emitter and the photoelectric receiver to accommodate the trigger part 23. When the trigger part 23 moves between the photoelectric emitter and the photoelectric receiver, the trigger part 23 blocks the light emitted by the photoelectric emitter so that the photoelectric receiver cannot receive the light emitted by the photoelectric emitter, thereby triggering the photoelectric sensor 5. In other embodiments, one of the photoelectric sensor 5 and the trigger part 23 is a photoelectric emitter, and the other is a photoelectric receiver. When the trigger part 23 moves to a position opposite to the photoelectric sensor 5, the light emitted by the photoelectric emitter can be received by the photoelectric receiver to trigger the photoelectric sensor 5. Of course, the photoelectric sensor 5 can also be a proximity switch, and the trigger part 23 is a metal sheet capable of triggering the proximity switch.

[0122] Furthermore, refer to Figure 8 The proportional valve also includes a mounting base 4 and a proportional valve circuit board 6 disposed on the mounting base 4, and a photoelectric sensor 5 disposed on the proportional valve circuit board 6.

[0123] It is understandable that both the drive unit 3 and the photoelectric sensor 5 are electrically connected to the proportional valve circuit board 6 so that the proportional valve circuit board 6 can control the drive unit 3 according to the signal from the photoelectric sensor 5.

[0124] Since the photoelectric sensor 5 is located on the proportional valve circuit board 6, the photoelectric sensor 5 is integrated into the proportional valve circuit board 6. On the one hand, this reduces the difficulty of electrical connection between the photoelectric sensor 5 and the proportional valve circuit board 6, and on the other hand, it increases the structural compactness of the proportional valve, so as to facilitate the miniaturization design of the proportional valve.

[0125] Furthermore, since the proportional valve circuit board 6 is located on the mounting base 4, the proportional valve circuit board 6 is integrated into the mounting base 4, thereby further increasing the structural compactness of the proportional valve and further facilitating the miniaturization design of the proportional valve.

[0126] Furthermore, refer to Figure 3 , Figure 7 and Figure 8 The proportional valve circuit board 6 has a connecting lug 61, and the mounting base 4 has a positioning rib 42 located on the side of the connecting lug 61.

[0127] Understandably, after the proportional valve circuit board 6 is installed on the mounting base 4, the connecting lug 61 abuts against the positioning rib 42.

[0128] Since the proportional valve circuit board 6 has a connecting ear 61 and the mounting base 4 has a positioning rib 42 located on the side of the connecting ear 61, the positioning rib 42 can be used to position the connecting ear 61, so as to facilitate the accurate installation of the proportional valve circuit board 6 and reduce the installation difficulty of the proportional valve circuit board 6. On the other hand, the positioning rib 42 and the connecting ear 61 can be used to limit the proportional valve circuit board 6, so as to increase the stability of the proportional valve circuit board 6 and the photoelectric sensor 5, thereby ensuring the stable operation of the proportional valve.

[0129] This application does not specify a particular method for fixing the proportional valve circuit board 6. Preferably, the connecting ear 61 is provided with a hole structure, and the proportional valve circuit board 6 is fixedly connected to the mounting base 4 by screws passing through the hole structure, thereby increasing the connection stability between the proportional valve circuit board 6 and the mounting base 4. In other embodiments, the proportional valve circuit board 6 can also be fixedly connected to the mounting base 4 by adhesive.

[0130] Furthermore, refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 The valve seat 1 is provided with a guide ring 121 sleeved on the outside of the connecting part 22. The proportional valve circuit board 6 is located between the guide ring 121 and the mounting base 4, and the guide ring 121 is provided with a clearance notch to avoid the proportional valve circuit board 6.

[0131] Since the proportional valve circuit board 6 is located between the guide ring 121 and the mounting base 4, the proportional valve circuit board 6 can fully contact the mounting base 4, thereby ensuring the contact area between the proportional valve circuit board 6 and the mounting base 4 and increasing the connection stability between the proportional valve circuit board 6 and the mounting base 4.

[0132] Furthermore, since the guide ring 121 is provided with a clearance notch to avoid the proportional valve circuit board 6, the distance between the valve core 2 and the mounting base 4 can be reduced, thereby increasing the structural compactness of the proportional valve and further facilitating the miniaturization design of the proportional valve.

[0133] Reference Figure 9 and Figure 10 This application also discloses a constant flow module, which includes an intake pipe, a pressure sensor 7 connected to the intake pipe, a flow sensor 8 connected to the intake pipe, and a proportional valve as described above, wherein the inlet section 111 of the proportional valve is connected to the outlet of the flow sensor 8.

[0134] Understandably, the intake pipe is connected to the pipe of the nitric oxide breath analyzer, and the outlet section 112 of the proportional valve is connected to the pipe of the nitric oxide breath analyzer so that the patient's exhaled gas needs to pass through the constant flow module. The intake pipe is connected to the pressure sensor 7 and the flow sensor 8 through a three-way connector.

[0135] When using the constant flow module in this application, the inlet pipe is connected to the pipe of the nitric oxide breath analyzer, and the outlet section 112 of the proportional valve is connected to the pipe of the nitric oxide breath analyzer. This allows the patient's exhaled gas to first enter the inlet pipe. Then, part of the gas in the inlet pipe enters the pressure sensor 7 to detect the pressure of the patient's exhaled gas, and the other part enters the flow sensor 8 to detect the flow rate of the patient's exhaled gas. The proportional valve is then adjusted based on the pressure of the patient's exhaled gas detected by the pressure sensor 7 and the flow rate of the patient's exhaled gas detected by the flow sensor 8. This adjusts the patient's exhaled gas to the set flow rate, thereby reducing the difficulty for patients to measure FeNO50 and FeNO200 parameters and improving the patient's testing experience.

[0136] Specifically, when the flow rate of the patient's exhaled gas detected by the flow sensor 8 is less than the target range and the pressure of the patient's exhaled gas detected by the pressure sensor 7 is less than the target range, if the flow area of ​​the connecting section 113 is increased by the movement of the valve core 2, the pressure of the patient's exhaled gas will be further reduced, which will not meet the clinical needs. Therefore, no proportional valve is adjusted, and medical staff remind the patient to increase the exhalation force.

[0137] When the flow rate of the patient's exhaled gas detected by the flow sensor 8 is less than the target range and the pressure of the patient's exhaled gas detected by the pressure sensor 7 meets or exceeds the target range, the actuator 3 drives the valve core 2 to move the regulating part 21 toward the outside of the connecting section 113, thereby increasing the flow area of ​​the connecting section 113, increasing the flow rate of the patient's exhaled gas until it meets the target range, at which point the pressure decreases accordingly; if the reduced pressure meets the target range, it meets clinical requirements, the actuator 3 stops working, and the valve core 2 remains in the current position, maintaining the current force on the patient. Continue exhaling; if the reduced pressure is less than the target range, the actuator 3 drives the valve core 2 to move the adjusting part 21 toward the interior of the connecting section 113. The flow area of ​​the connecting section 113 decreases, the flow rate of the patient's exhaled gas decreases, and the pressure of the patient's exhaled gas increases accordingly. If the flow rate and pressure are still within the target range, then the clinical requirements are met, the actuator 3 stops working, so that the valve core 2 remains in the current position, and the patient continues to exhale with the current force. If the pressure value reaches the target range, but the patient's exhaled flow rate is less than the target range, the patient is reminded to increase the exhalation force.

[0138] When the flow rate of the patient's exhaled gas detected by the flow sensor 8 is at or above the target range and the pressure of the patient's exhaled gas detected by the pressure sensor 7 is below the target range, the valve core 2 is driven by the drive unit 3, so that the adjustment part 21 extends into the connecting section 113, thereby reducing the flow area of ​​the connecting section 113, so as to reduce the flow rate of the patient's exhaled gas and increase the pressure of the patient's exhaled gas. When the pressure of the patient's exhaled gas is within the target range, and the flow rate of the patient's exhaled gas is still within the target range, then the clinical requirements are met, the drive unit 3 stops working, so that the valve core 2 stays in the current position, and the patient continues to exhale with the current force. If the pressure value reaches the target range, but the flow rate of the patient's exhaled gas is below the target range, then the patient is reminded to increase the exhalation force.

[0139] When the flow rate of the patient's exhaled gas detected by the flow sensor 8 is greater than the target range and the pressure of the patient's exhaled gas detected by the pressure sensor 7 is within the target range, the valve core 2 is driven by the drive unit 3 so that the adjustment part 21 extends into the connecting section 113, thereby reducing the flow area of ​​the connecting section 113 and decreasing the patient's exhaled gas flow rate until the patient's exhaled gas flow rate is reduced to the target range. When the flow rate is reduced to the target range, if the pressure value is within the target range, the drive unit 3 stops working, the valve core 2 remains in the current position, and the patient continues to exhale with the current force. If the pressure value is greater than the target range, the patient is reminded to reduce the exhalation force.

[0140] When the flow rate of the patient's exhaled air detected by the flow sensor 8 is greater than the target range and the pressure of the patient's exhaled air detected by the pressure sensor 7 is greater than the target range, the patient is reminded to reduce the force of exhalation.

[0141] In a preferred embodiment, refer to Figure 9 and Figure 10 The constant flow module also includes a control circuit board 9, a pressure sensor 7 is located on the control circuit board 9, and the control circuit board 9 is electrically connected to the flow sensor 8.

[0142] It is understandable that the pressure sensor 7, flow sensor 8, and proportional valve circuit board 6 are all electrically connected to the control circuit board 9 so that the control circuit board 9 can send signals to the proportional valve circuit board 6 based on the pressure signal from the pressure sensor 7 and the flow signal from the flow sensor 8, so that the proportional valve circuit board 6 can control the drive unit 3 based on the signals sent by the control circuit board 9.

[0143] Since the pressure sensor 7 is located on the control circuit board 9, the difficulty of electrical connection between the pressure sensor 7 and the control circuit board 9 is reduced, thereby reducing the manufacturing difficulty of the proportional valve. On the other hand, the pressure sensor 7 is integrated into the control circuit board 9, which increases the structural compactness of the constant current module and facilitates the miniaturization design of the constant current module.

[0144] In a preferred embodiment, the constant flow module further includes a solenoid valve 91, the inlet of which is connected to the outlet of the flow sensor 8 or to the outlet section 112 of the proportional valve.

[0145] It is understood that the outlet of solenoid valve 91 is connected to air; this embodiment includes two schemes, one of which is as follows: Figure 9 As shown, the outlet of flow sensor 8 is connected to the inlet of solenoid valve 91 and the inlet section 111 of proportional valve via a tee connector; another type is as follows... Figure 10 As shown, the flow sensor 8 is located downstream of the proportional valve, that is, the outlet section 112 of the proportional valve is connected to the inlet of the solenoid valve 91 and the pipeline of the nitric oxide breath analyzer through a three-way connector.

[0146] Since the inlet of the solenoid valve 91 is connected to the outlet of the flow sensor 8 or to the outlet section 112 of the proportional valve, when the patient exhales, the solenoid valve 91 can be opened to allow part of the patient's exhaled air to be directly discharged into the air, thereby reducing the patient's exhalation resistance, reducing the difficulty of the patient's exhalation, improving the smoothness of the patient's exhalation, and further improving the patient's testing experience.

[0147] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0148] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0149] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A proportional valve, characterized in that, include: Valve seat (1), the valve seat (1) having a medium passage (11), the medium passage (11) including an inlet section (111), an outlet section (112) and a connecting section (113) connecting the inlet section (111) and the outlet section (112); The valve core (2) is connected to the valve seat (1), and the valve core (2) has an adjusting part (21) and a connecting part (22), the adjusting part (21) being able to extend into the connecting section (113); A drive member (3) is connected to the connecting part (22) and is used to drive the valve core (2) to move in order to adjust the flow area of ​​the connecting section (113).

2. A proportional valve according to claim 1, characterized in that, The valve core (2) is coaxially arranged with the connecting section (113), and the diameter of the adjusting part (21) is gradually reduced in the direction away from the connecting part (22).

3. A proportional valve according to claim 2, characterized in that, The connecting segment (113) includes a first segment (115) and a second segment (116) with an inner diameter smaller than that of the first segment (115). The second segment (116) is located at one end of the adjusting part (21) away from the connecting part (22), and the diameter of the adjusting part (21) away from the connecting part (22) is smaller than the inner diameter of the second segment (116).

4. A proportional valve according to claim 3, characterized in that, The inlet section (111) is connected to the first section (115), and the outlet section (112) is connected to the second section (116).

5. A proportional valve according to any one of claims 1-4, characterized in that, The medium channel (11) further includes a guide section (114), which is connected to the connecting section (113), and at least a portion of the connecting part (22) is located in the guide section (114).

6. A proportional valve according to claim 5, characterized in that, The outer peripheral surface of the connecting part (22) is provided with a limiting groove (221), and the connecting part (22) is provided with a sealing member (222) sleeved in the limiting groove (221), and the sealing member (222) is located inside the guide section (114).

7. A proportional valve according to any one of claims 1-4, characterized in that, The outer peripheral surface of the connecting part (22) is provided with a plurality of mating teeth (223) along the axial direction of the valve core (2). The driving component (3) includes a stepper motor (31) and a driving gear (32). The driving gear (32) is meshed with the mating teeth (223) for transmission connection. The output shaft of the stepper motor (31) is transmitted to the driving gear (32).

8. A proportional valve according to claim 7, characterized in that, The proportional valve also includes a gearbox, the input shaft of which rotates at a speed greater than the output ... And / or, the valve seat (1) is provided with a guide wall (12) located outside the connecting part (22), the guide wall (12) is provided with a guide ring (121) sleeved outside the connecting part (22), and the drive gear (32) is located between the valve seat (1) and the guide ring (121).

9. A proportional valve according to any one of claims 1-4, characterized in that, The proportional valve also includes a mounting base (4), and the valve seat (1) and the drive component (3) are both located on the mounting base (4).

10. A proportional valve according to any one of claims 1-4, characterized in that, The proportional valve also includes a photoelectric sensor (5), and the valve core (2) also includes a trigger part (23) disposed on the connection part (22), the trigger part (23) being able to trigger the photoelectric sensor (5).

11. A proportional valve according to claim 10, characterized in that, The proportional valve also includes a mounting base (4) and a proportional valve circuit board (6) disposed on the mounting base (4), and the photoelectric sensor (5) is disposed on the proportional valve circuit board (6).

12. A proportional valve according to claim 11, characterized in that, The proportional valve circuit board (6) has a connecting lug (61), and the mounting base (4) has a positioning rib (42) located on the side of the connecting lug (61); And / or, the valve seat (1) is provided with a guide ring (121) sleeved on the outside of the connecting part (22), the proportional valve circuit board (6) is located between the guide ring (121) and the mounting base (4), and the guide ring (121) is provided with a clearance notch that avoids the proportional valve circuit board (6).

13. A constant current module, characterized in that, It includes an intake manifold, a pressure sensor (7) connected to the intake manifold, a flow sensor (8) connected to the intake manifold, and a proportional valve as described in any one of claims 1-12, wherein the inlet section (111) of the proportional valve is connected to the outlet of the flow sensor (8).

14. A constant current module according to claim 13, characterized in that, The constant flow module also includes a control circuit board (9), the pressure sensor (7) is disposed on the control circuit board (9), and the control circuit board (9) is electrically connected to the flow sensor (8); And / or, the constant flow module further includes a solenoid valve (91), the inlet of which is connected to the outlet of the flow sensor (8) or to the outlet section (112) of the proportional valve.

Images