Gas constant flow valve and nitric oxide detection equipment
Through the fixed connection between the linear stepper motor and the valve core and the design of elastic parts, the problem of sliding deviation of the valve core is solved, the precise control of gas flow is achieved, and the wear and use cost of the equipment is reduced.
Patent Information
- Application Number
- CN202422711438.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-11-06
AI Technical Summary
In existing constant flow valves, the assembly deviation between the valve core and the slider leads to deviation between the slider and the screw, causing resistance and wear, and cannot guarantee the sliding accuracy of the valve core and affect the accuracy of the gas flow control.
A linear stepper motor is used to fix the valve core, and a stable support is provided through the first elastic member to reduce friction. Combined with the position detection device and the transmission member, the fine position adjustment of the valve core is achieved.
It reduces the friction between the valve core and the linear stepper motor, reduces equipment losses, improves the accuracy of gas flow control and the service life of the equipment, and reduces the cost of use.
Smart Images
Figure CN223215857U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of constant flow valves, in particular to a gas constant flow valve and nitric oxide detection equipment. Background Art
[0002] Currently, nitric oxide detectors or all-in-one breath analyzers require a constant flow valve to limit the flow of exhaled gas. The flow limiting purpose is achieved by moving the valve core back and forth in the constant flow valve, and the movement of the valve core is driven by a motor.
[0003] In the existing constant flow valve, a screw is provided on the side of the motor close to the valve core, the screw output shaft is connected to the slider with a thread, and the slider is fixedly connected to the valve core. When the motor is started, the valve core is slidably connected to the cylinder body inside the cylinder body, and the slider is fixed on the valve core. The rotation of the screw output shaft will drive the slider threaded with it to make a linear motion in the cylinder body, thereby driving the valve core to slide and drive the valve core to extend into the air flow port for adjustment.
[0004] However, there is a certain deviation in the fit between the slider and the screw rod, and there is also an assembly deviation between the slider and the valve core fixation, which may cause a certain deviation force when the slider moves forward or backward. These deviation forces will bring a certain resistance and accelerate the wear of the threads on the slider, and thus cannot guarantee the sliding of the valve core driven by the slider. Utility Model Content
[0005] The purpose of the utility model is to provide a gas constant flow valve and a nitric oxide detection device which can directly control the sliding of a valve core.
[0006] In order to achieve the above object, the utility model provides a gas constant flow valve, comprising:
[0007] The housing is provided with an air inlet pipe, a regulating port, a cavity and an air outlet pressure port in sequence, and the air inlet pipe is also provided with an air inlet pressure port;
[0008] a valve core, the valve core being arranged in the cavity near the regulating port and being used to adjust the ventilation area of the regulating port;
[0009] a linear stepping motor, the linear stepping motor being arranged at an end of the valve core away from the regulating port and being fixedly connected to the valve core, and being used for driving the valve core to slide away from or close the regulating port;
[0010] A first elastic member is sleeved on the valve core and located in the cavity, and a diameter of the first elastic member gradually increases along a direction from the linear stepping motor to the air intake pipe.
[0011] Furthermore, it also includes a transmission member driven by the linear stepping motor for transmitting force, and a mounting groove is opened at one end of the valve core close to the linear stepping motor, and the transmission member is inserted into the mounting groove of the valve core.
[0012] Furthermore, the housing includes a first shell and a second shell, the cavity is enclosed by the first shell and the second shell, and the valve core is slidably connected and arranged in the first shell.
[0013] Furthermore, the gas constant flow valve also includes a first seal, which is arranged in the cavity, one end of the first seal is sleeved on the valve core, and the other end of the first seal is abutted against the connection between the first shell and the second shell.
[0014] Furthermore, the valve core is provided with a groove at the connection between the valve core and the first sealing member, and the first sealing member is provided with a mounting portion, and the mounting portion is mounted in the groove.
[0015] Furthermore, the first sealing member further includes a sealing portion, and the sealing portion protrudes toward one side of the linear stepping motor.
[0016] Furthermore, an adjusting member is provided at one end of the valve core extending into the adjusting port.
[0017] Furthermore, the adjusting member is conical.
[0018] Furthermore, the gas constant flow valve further includes a position detection device, which is arranged on a side of the linear stepping motor away from the cavity, and is used to detect the position of the end of the transmission member.
[0019] The second aspect of the present invention further provides a nitric oxide detection device, comprising a host and a breathing handle connected to the host, wherein the host comprises a housing and the above-mentioned gas constant flow valve.
[0020] Compared with the prior art, the gas constant flow valve and nitric oxide detection device of the present invention have the following beneficial effects:
[0021] The utility model sets a fixed connection between the valve core and the linear stepping motor, thereby directly controlling the sliding of the valve core to move away from or close the regulating port. There is no deviation force between the two, which reduces the friction between the valve core and the linear stepping motor, thereby reducing equipment loss and lowering the cost of use; the first elastic member is sleeved on the valve core, and its diameter gradually increases along the direction from the linear stepping motor to the air intake pipe. The end with the largest diameter of the first elastic member abuts against the side wall of the cavity. When the valve core is adjusted, the first elastic member can provide stable support for the valve core, so that the position of the valve core can be finely adjusted according to needs. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 1 is a cross-sectional schematic diagram of a gas constant flow valve according to an embodiment of the present utility model;
[0023] Figure 2 This is a schematic diagram of the explosion structure of the gas constant flow valve according to an embodiment of the present utility model;
[0024] Figure 3 It is a schematic diagram of the installation structure of the valve core, the first sealing member and the first elastic member in an embodiment of the utility model.
[0025] In the figure, 100, gas constant flow valve; 1, shell; 11, first shell; 111, air inlet pipe; 112, air inlet pressure port; 113, air outlet pressure port; 114, regulating port; 12, second shell; 13, cavity; 2, valve core; 21, mounting groove; 22, groove; 23, regulating member; 3, linear stepping motor; 4, first elastic member; 5, transmission member; 6, first sealing member; 61, mounting portion; 62, sealing portion; 7, position detection device. DETAILED DESCRIPTION
[0026] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.
[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0029] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0030] In the examples, "parallel" refers to the state where the angle formed between two lines, between a line and a plane, or between two planes is between -1° and 1°. Furthermore, "perpendicular" refers to the state where the angle formed between two lines, between a line and a plane, or between two planes is between 89° and 91°. Equal distances, equal angles, or equal areas refer to the state where the tolerance range is between -1% and 1%.
[0031] like Figures 1 to 3 As shown, a gas constant flow valve 100 according to a preferred embodiment of the present invention includes: a housing 1 , a valve core 2 , a linear stepping motor 3 and a first elastic member 4 .
[0032] The housing 1 comprises a first shell 11 and a second shell 12. The housing 1 is provided with an air inlet line 111, a regulating port 114, a cavity 13, and an air outlet pressure port 113. The air inlet line is also provided with an air inlet pressure port 112. The cavity 13 is enclosed by the first shell 11 and the second shell 12. The cavity 13 and the air inlet line 111 are respectively provided at both ends of the regulating port. Pressure detection devices (not shown) are also connected to the air inlet pressure port 112 and the air outlet pressure port 113 to detect the air inlet and outlet pressures.
[0033] In this embodiment, there are two pathways for the gas exhaled by the human body from the air inlet pipe 111 into the gas constant flow valve 100 to leave the gas constant flow valve 100: one pathway is for the gas to flow directly from the air inlet pressure port 112 to the pressure detection device (not marked in the figure); the other pathway is for the gas to pass through the regulating port 114 and the cavity 13 and flow out of the pressure detection device (not marked in the figure) from the air outlet pressure port 113, and at the same time, the gas can also be connected to the air pipeline to flow out the gas.
[0034] The valve core 2 is disposed within the cavity 13, with one end proximate to the regulating port 114 for adjusting the ventilation area of the regulating port 114. The other end is connected to the linear stepper motor 3, which controls the movement of the valve core 2. The valve core 2 is also in sliding connection with the first shell 11. If the valve core 2 is inserted into the regulating port 114 and moves toward the air inlet line 111, the ventilation area of the regulating port 114 decreases, the gas discharged from the air outlet pressure port 113 decreases, and the pressure measured at the air outlet pressure port 113 decreases. If the valve core 2 moves away from the air inlet line 111, the ventilation area of the regulating port 114 increases, the gas discharged from the air outlet pressure port 113 increases, and the pressure measured at the air outlet pressure port 113 increases.
[0035] A linear stepper motor 3 is disposed at the end of the valve core 2 away from the regulating port 114 and is fixedly connected to the valve core 2. The linear stepper motor 3 is used to drive the valve core 2 to slide away from or close the regulating port 114. The linear stepper motor 3 directly converts electrical energy into linear motion mechanical energy. By incorporating a pressure detection device to sense the real-time pressure changes of a person's exhaled air, the linear stepper motor 3 is controlled in real time in terms of its movement direction and number of steps. This controls the degree of opening and closing of the valve core 2 at the regulating port 114, thereby adjusting the air intake volume of the intake pipe 111 and achieving a constant air flow output.
[0036] The first elastic member 4 is sleeved onto the valve core 2. The diameter of the first elastic member 4 gradually increases along the direction from the linear stepping motor 3 to the intake pipe 111. In this application, the end with the largest diameter of the first elastic member 4 abuts the outer wall of the first housing 11, while the end with the smallest diameter of the first elastic member 4 is disposed on the valve core 2. In other words, the end with the largest diameter of the first elastic member 4 is the fixed end, while the end with the smallest diameter of the first elastic member 4 is the moving end.
[0037] The end with the largest diameter of the first elastic member 4 as the fixed end can provide better stability because it has a larger contact area and can better resist tilting or offset, ensuring the stability of the first elastic member 4 when it is under load. The end with the smallest diameter of the first elastic member 4 as the movable end can reduce stress concentration because the pressure on the movable end is relatively small, which can extend the service life of the first elastic member 4. Similarly, when the valve core 2 is slidingly adjusted, it is the end with the smallest diameter of the first elastic member 4 that moves with the valve core 2. Its curvature radius is smaller, which means that under the same load, it is more likely to bend and deform, so that the valve core 2 can be finely adjusted in position according to needs.
[0038] Furthermore, the gas constant flow valve 100 also includes a transmission member 5 driven by the linear stepping motor 3 for transmitting force, and an installation groove 21 is opened at one end of the valve core 2 close to the linear stepping motor 3, and the transmission member 5 is inserted into the installation groove 21 of the valve core 2.
[0039] Specifically, the transmission member 5 is inserted into the mounting groove 21 of the valve core 2, and the transmission member 5 and the valve core 2 are coaxially driven. When the linear stepper motor 3 is started, it drives the transmission member 5 to move, and then the transmission mechanism drives the valve core 2 to move, thereby realizing the movement of the valve core 2.
[0040] In this embodiment, the transmission member 5 is provided to ensure a stable connection between the linear stepper motor 3 and the valve core 2. The transmission member 5 can serve as an isolation element to reduce the impact of vibration generated by the linear stepper motor 3 during operation on the valve core 2 and the entire system, thereby improving the stability of the system. The transmission member 5 can simplify the connection between the valve core 2 and the linear stepper motor 3, making installation and subsequent maintenance more convenient. If the transmission member 5 is damaged, only the transmission member 5 and the linear stepper motor 3 need to be replaced, without replacing the entire gas constant flow valve 100. Similarly, if the position accuracy or stroke of the valve core 2 needs to be adjusted, this can be achieved by adjusting the transmission member 5 without having to modify the linear stepper motor 3, thus facilitating adjustment and maintenance.
[0041] Furthermore, the gas constant flow valve 100 further includes a first sealing member 6, which is disposed within the cavity 13. One end of the first sealing member 6 is sleeved onto the valve core 2, and the other end of the first sealing member 6 abuts against the connection between the first shell 11 and the second shell 12. The first sealing member 6 includes a sealing portion 62, which protrudes toward the side of the linear stepping motor 3.
[0042] In this embodiment, the first sealing member 6 is made of silicone and is bowl-shaped, with the sealing portion 62 being the rim of the bowl. The mouth of the bowl of the first sealing member 6 is located at the junction of the first shell 11 and the second shell 12, and abuts against the first shell 11 and the second shell 12. The diameter of the mouth of the bowl of the first sealing member 6 is greater than the diameter of the inner cavity 13 of the first shell 11, that is, one end of the mouth of the bowl can cover the inner cavity 13 of the first shell 11. The valve core 2 passes through the bottom of the bowl of the first sealing member 6 and is fixed to the bottom of the bowl. When the valve core 2 moves away from or approaches the regulating port 114, the bottom and rim of the bowl of the first sealing member 6 undergo elastic deformation.
[0043] In this embodiment, the first sealing member 6 is a bowl-shaped sealing member. During the reciprocating motion of the valve core 2, the bowl-shaped sealing member can better adapt to the displacement of the valve core 2, and seal the first shell 11, the second shell 12 and the valve core 2, thereby providing a buffer and correcting the coaxial motion deviation, and also providing a certain resilience when using silicone material.
[0044] See also Figure 3 As shown, further, the valve core 2 is provided with a groove 22 at the connection between the valve core 2 and the first sealing member 6 , and the first sealing member 6 is provided with a mounting portion 61 , and the mounting portion 61 is mounted in the groove 22 .
[0045] In this embodiment, a groove 22 is provided on the valve core 2. Because the first sealing member 6 is sleeved on the outer wall of the valve core 2, the groove 22 is arranged in a circumferential manner on the valve core 2. That is, a circle of evenly distributed annular grooves 22 is provided on the outer circumference of the valve core 2. The grooves 22 can be V-shaped, U-shaped, or other shapes. The provision of the grooves 22 facilitates the secure sleeve placement of the first sealing member 6 on the valve core 2 through the grooves 22 and also facilitates the removal and replacement of the seal. Furthermore, if the first sealing member 6 expands or contracts during use due to changes in external pressure or temperature, the grooves 22 provide space to accommodate the deformation of the first sealing member 6, thereby maintaining the effectiveness of the seal.
[0046] Furthermore, a mounting portion 61 is provided at the contact point between the first seal 6 and the groove 22, and the size and shape of the mounting portion 61 match the groove 22. The mounting portion 61 can ensure that the first seal 6 is correctly installed in the designated position and will not slide or fall off easily, which helps to fix the first seal 6 and keep it stable during operation. The mounting portion 61 fits tightly with the groove 22, which can enhance the contact surface between the seal and the groove 22, thereby improving the sealing effect and preventing gas leakage. The design of the mounting portion 61 can prevent the first seal 6 from twisting or misalignment during installation or use, ensuring that the first seal 6 functions normally. When the first seal 6 needs to be replaced, the appropriate mounting portion 61 allows the user to easily remove and install a new one, reducing the workload of maintenance.
[0047] In the present invention, a groove 22 is provided on the valve core 2, and a sealing portion 62 is provided on the first sealing member 6, which are key parts connecting the first sealing member 6 and the valve core 2. They ensure the sealing of the gas constant flow valve 100 and are important parts for ensuring the normal use and operation of the gas constant flow valve 100.
[0048] Specifically, the first sealing member 6 is bowl-shaped and made of silicone. When the valve core 2 moves away from or close to the regulating port 114 , the bottom and edge of the bowl of the first sealing member 6 undergo elastic deformation.
[0049] Furthermore, an adjusting member 23 is provided at one end of the valve core 2 extending into the adjusting port 114. Optionally, the adjusting member 23 of the valve core 2 can be cylindrical, spherical, butterfly-shaped, conical, or the like.
[0050] Preferably, in this embodiment, the adjusting member 23 is tapered, with a sharp end of the adjusting member 23 disposed close to the adjusting opening 114 and a rounded end of the adjusting member 23 disposed away from the adjusting opening 114 .
[0051] When using the regulating member 23 of the valve core 2 for adjustment, the regulating member 23 of the valve core 2 is inserted into the regulating port 114 to adjust the ventilation area of the regulating port 114. When the regulating member 23 of the valve core 2 is fully inserted into the regulating port 114, the end of the regulating port 114 close to the valve core 2 can be completely closed to provide a better sealing effect. Due to the design of the conical structure, the valve core 2 can adjust the ventilation area of the regulating port 114 gradually and step by step, and can make slight position changes and make fine adjustments according to actual needs, so that the gas flow rate can be controlled very accurately. Similarly, the conical structure can also help slow down the gas flow rate, play a certain pressure reduction role, and ensure the smooth flow of gas.
[0052] Furthermore, the gas constant flow valve 100 further includes a position detection device 7 , which is disposed on a side of the linear stepping motor 3 away from the cavity 13 , and is used to detect the position of the end of the transmission member 5 .
[0053] Specifically, in this embodiment, the position detection device 7 may be an infrared optical coupler, which can detect the position of the transmission member 5 connected to the linear stepping motor 3 to prevent the transmission member 5 from exceeding the moving range when moving.
[0054] In a second aspect, the present invention further provides a nitric oxide detection device comprising a main unit and a breathing handle connected to the main unit, wherein the main unit comprises a housing and the aforementioned gas constant flow valve 100. The breathing handle is a device for the human body to exhale, which is connected to the main unit and transmits the exhaled gas to the gas constant flow valve 100 disposed in the main unit for detection.
[0055] The working process of the present utility model is as follows: when the gas constant flow valve 100 is in operation, gas flows into the gas constant flow valve 100 from the air inlet pipe 111. There are two passages in the gas constant flow valve 100. One passage is for gas to flow directly from the air inlet pressure port 112 to the connected pressure detection device, and the other passage is for gas to flow through the regulating port 114, the cavity 13, and out of the air outlet pressure port 113 to the connected pressure detection device and the air pipeline. When the gas flow needs to be adjusted, the linear stepper motor 3 is turned on, and the linear stepper motor 3 drives the valve core 2 to move. By moving the valve core 2 away from or closer to the regulating port 114, the ventilation area of the regulating port 114 is adjusted. When the required gas pressure value is adjusted, the linear stepper motor 3 can be stopped or turned off.
[0056] In summary, the embodiments of the present invention provide a gas constant flow valve and a nitric oxide detection device, which directly controls the sliding of the valve core to move away from or close the air intake pipe by setting a valve core and a linear stepping motor. There is no deviation force between the two, which reduces the friction between the valve core and the linear stepping motor, thereby reducing equipment loss and lowering the cost of use; the first elastic part is mounted on the valve core, and its diameter gradually increases along the direction from the linear stepping motor to the air intake pipe. The largest diameter end of the first elastic part abuts against the cavity. When the valve core is adjusted, the first elastic part can provide stable support for the valve core, so that the position of the valve core can be finely adjusted according to needs.
[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A gas constant flow valve, characterized in that: include: The housing is provided with an air inlet pipe, a regulating port, a cavity and an air outlet pressure port in sequence, and the air inlet pipe is also provided with an air inlet pressure port; a valve core, the valve core being arranged in the cavity near the regulating port and being used to adjust the ventilation area of the regulating port; a linear stepping motor, the linear stepping motor being arranged at an end of the valve core away from the regulating port and being fixedly connected to the valve core, and being used for driving the valve core to slide away from or close the regulating port; A first elastic member is sleeved on the valve core and located in the cavity, and a diameter of the first elastic member gradually increases along a direction from the linear stepping motor to the air intake pipe.
2. The gas constant flow valve according to claim 1, characterized in that: It also includes a transmission member driven by the linear stepping motor for transmitting force. An installation groove is opened at one end of the valve core close to the linear stepping motor, and the transmission member is inserted into the installation groove of the valve core.
3. The gas constant flow valve according to claim 1, characterized in that: The housing includes a first shell and a second shell, the cavity is enclosed by the first shell and the second shell, and the valve core is slidably connected and disposed in the first shell.
4. The gas constant flow valve according to claim 3, characterized in that: The gas constant flow valve further includes a first sealing member, which is disposed in the cavity. One end of the first sealing member is sleeved on the valve core, and the other end of the first sealing member abuts against the connection between the first shell and the second shell.
5. The gas constant flow valve according to claim 4, characterized in that: The valve core is provided with a groove at the connection position with the first sealing member. The first sealing member is provided with a mounting portion, and the mounting portion is mounted in the groove.
6. The gas constant flow valve according to claim 5, characterized in that: The first sealing member further includes a sealing portion, and the sealing portion is protruded toward one side of the linear stepping motor.
7. The gas constant flow valve according to claim 1, characterized in that: An adjusting member is provided at one end of the valve core extending into the adjusting port.
8. The gas constant flow valve according to claim 7, characterized in that: The adjusting member is tapered.
9. The gas constant flow valve according to claim 2, characterized in that: The gas constant flow valve further includes a position detection device, which is arranged on a side of the linear stepping motor away from the cavity, and is used to detect the position of the end of the transmission member.
10. A nitric oxide detection device, characterized in that: The device comprises a main unit and a breathing handle connected to the main unit, wherein the main unit comprises a housing and the gas constant flow valve according to any one of claims 1 to 9.