CN219035946U - Porous plate throttling element for pulmonary function instrument - Google Patents
Porous plate throttling element for pulmonary function instrument Download PDFInfo
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- CN219035946U CN219035946U CN202223506093.4U CN202223506093U CN219035946U CN 219035946 U CN219035946 U CN 219035946U CN 202223506093 U CN202223506093 U CN 202223506093U CN 219035946 U CN219035946 U CN 219035946U
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Abstract
The utility model relates to the technical field of throttling devices, and discloses a porous plate throttling element for a pulmonary function instrument, which comprises a measuring tube, a front pressure taking nozzle and a rear pressure taking nozzle, wherein the measuring tube is provided with a fluid cavity, and a porous plate structure positioned in the fluid cavity is arranged on the measuring tube; the porous plate structure comprises a plate body, a first through hole and a second through hole; the aperture of the first through hole is larger than that of the second through hole; the first through hole is arranged at the center of the plate body; the second through holes are uniformly distributed on the plate body around the first through holes. The porous plate throttling element for the pulmonary function instrument provided by the utility model can minimize vortex flow when fluid passes through a porous plate structure, the fluid forms approximate ideal fluid through balanced rectification, the fluid can form stable differential pressure at the upstream and downstream of the throttling element, the dead zone effect is reduced, the permanent pressure loss is reduced, the fluctuation of pressure taking signals is reduced, and further the balance measurement of the fluid is facilitated.
Description
Technical Field
The utility model relates to the technical field of throttling devices, in particular to a porous plate throttling element for a pulmonary function instrument, which is mainly applied to the fields of industry, chemistry, food, medical treatment and the like and needs to monitor and control the flow, temperature and pressure of physical parameters of fluid (gas and liquid).
Background
In the fields of industry, chemistry, food and medicine, there is a need to monitor and control the physical parameters flow, temperature and pressure of fluids (gases and liquids). The measurement of flow is difficult relative to the temperature and pressure measurement methods, and is therefore important for flow measurement.
The differential pressure type flowmeter with the throttling device being a detection part has the advantages of firmness, good stability, low cost and the like, and is very suitable for the field of lung function detection. The standard throttling element of the traditional throttling device comprises a measuring tube and a single-hole plate arranged in the measuring tube, but the single-hole plate of the throttling element can only enable fluid to pass through in a single mode, as shown in fig. 4, larger vortex is formed near the single-hole plate, and further the differential pressure variation of the upstream and downstream of the throttling element is too large, so that the balance measurement of the fluid is not facilitated.
Disclosure of Invention
The utility model aims to overcome the problems in the prior art and provides a porous plate throttling element for a pulmonary function instrument, which has small vortex and is easy to realize balance measurement of fluid.
In order to achieve the above purpose, the present utility model adopts the following scheme:
a porous plate throttling element for a pulmonary function instrument, comprising a measuring tube, a front pressure taking nozzle and a rear pressure taking nozzle, wherein the measuring tube is provided with a fluid cavity, and a porous plate structure positioned in the fluid cavity is arranged on the measuring tube; the porous plate structure comprises a plate body, a first through hole and a second through hole;
the aperture of the first through hole is larger than that of the second through hole; the first through hole is arranged at the center of the plate body; the second through holes are uniformly distributed on the plate body around the first through holes.
Further, the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle are positioned on the same plane; the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle are perpendicular to the central axis of the measuring tube; the thickness of the plate body is smaller than the distance between the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle.
Further, the distance between the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle is 21-23mm.
Further, the distance between the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle is 22.5mm.
Further, the measuring tube comprises a front tube section, a throttle tube section and a rear tube section; the front pipe section, the throttling pipe section and the rear pipe section are sequentially communicated from front to rear; the inner diameter of the front pipe section is the same as the inner diameter of the rear pipe section; the inner diameter of the front pipe section is larger than the inner diameter of the throttle pipe section.
Further, the inner diameter of the front pipe section is 20-22mm; the inner diameter of the throttling pipe section is 16-17mm.
Further, the inner diameter of the front pipe section is 20mm; the inner diameter of the throttle pipe section is 16.8mm.
Further, the diameter of the first through hole is 9.5-10mm; the diameter of the second through hole is 2.8-3mm.
Further, the diameter of the first through hole is 9.72mm; the diameter of the second through hole is 2.8mm.
Further, the porous plate throttling element for the pulmonary function instrument is integrally formed through 3D printing.
Compared with the prior art, the utility model has the following advantages:
the utility model sets up the porous plate structure formed by plate body, first through hole and second through hole in measuring tube, set up a plurality of second through holes Kong Raodi-through hole on the plate body and distribute evenly, when the fluid passes the porous plate structure, the eddy current will be minimized, the fluid will form the approximate ideal fluid through the balanced rectification, the fluid will form the steady differential pressure in the upper and lower stream of the throttling element, reduce the dead zone effect, reduce the permanent pressure loss, reduce the fluctuation of the pressure signal, and then help to realize the balanced measurement of the fluid.
Drawings
The present application is described in further detail below with reference to the drawings and detailed description.
Fig. 1 is a schematic perspective view of a porous plate restrictor for a pulmonary function machine according to the present utility model.
Fig. 2 is a schematic cross-sectional view of a porous plate restrictor for a pulmonary function machine of the present utility model.
Fig. 3 is a schematic side view of a porous plate restrictor for a pulmonary function machine of the utility model.
Fig. 4 is a schematic cross-sectional view of a standard throttle member of a conventional throttle device of the present utility model.
The drawings include:
the measuring tube 1, the front tube section 11, the throttle tube section 12, the rear tube section 13, the fluid chamber 14, the front pressure taking nozzle 2, the rear pressure taking nozzle 3, the porous plate structure 4, the plate body 41, the first through hole 42 and the second through hole 43.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
As shown in fig. 1 to 3, a porous plate throttling element for a pulmonary function instrument comprises a measuring tube 1, a front pressure taking nozzle 2 and a rear pressure taking nozzle 3, wherein the measuring tube 1 is provided with a fluid cavity 14, and the measuring tube 1 is provided with a porous plate structure 4 positioned in the fluid cavity 14; the porous plate structure 4 includes a plate body 41, a first through hole 42, and a second through hole 43; the aperture of the first through hole 42 is larger than the aperture of the second through hole 43; the first through hole 42 is arranged at the center of the plate 41; the plurality of second through holes 43 are uniformly distributed on the plate 41 around the first through hole 42.
This a porous plate throttling element for pulmonary function appearance sets up in survey buret 1 and has the porous plate structure 4 that forms by plate body 41, first through-hole 42 and second through-hole 43, set up a plurality of second through-holes 43 on plate body 41 and evenly distributed around first through-hole 42, when the fluid passes porous plate structure 4, the vortex can be minimized, the fluid forms approximately ideal fluid through balanced rectification, the fluid can form stable differential pressure in the upper and lower stream of throttling element, reduce the dead zone effect, reduce permanent pressure loss, reduce the fluctuation of getting the pressure signal, and then be favorable to realizing the balanced measurement of fluid.
Preferably, the diameter of the first through hole 42 is 9.5-10mm, preferably 9.72mm; the diameter of the second through hole 43 is 2.8-3mm, preferably 2.8mm. By designing the size ranges of the first through hole 42 and the second through hole 43, the fluid forms good and stable differential pressure at the upstream and downstream of the throttling element, the overlarge change of the differential pressure is avoided, and the accurate measuring effect of the fluid is achieved.
Preferably, the central axis of the front pressure taking nozzle 2 and the central axis of the rear pressure taking nozzle 3 are positioned on the same plane; the central axis of the front pressure taking nozzle 2 and the central axis of the rear pressure taking nozzle 3 are perpendicular to the central axis of the measuring tube 1; the thickness of the plate 41 is smaller than the distance between the central axis of the front pressure taking nozzle 2 and the central axis of the rear pressure taking nozzle 3. The distance between the central axis of the front pressure tap 2 and the central axis of the rear pressure tap 3 is denoted as D. By defining the thickness of the plate body 41, the influence of the thickness of the porous plate structure 4 on the differential pressure of the fluid is reduced, and the accuracy of the fluid measurement is improved.
Wherein the distance between the central axis of the front pressure taking nozzle 2 and the central axis of the rear pressure taking nozzle 3 is 21-23mm, preferably 22.5mm.
In the present embodiment, the measuring tube 1 includes a front tube section 11, a throttle tube section 12, and a rear tube section 13; the front pipe section 11, the throttle pipe section 12 and the rear pipe section 13 are sequentially communicated from front to back; the inner diameter of the front pipe section 11 is the same as the inner diameter of the rear pipe section 13; the inner diameter of the front pipe section 11 is larger than the inner diameter of the throttle pipe section 12. This facilitates the flow to create a differential pressure upstream and downstream of the restriction, which is more conducive to fluid measurement. Wherein the inner diameter of the front pipe section 11 is 20-22mm, preferably 20mm; the inner diameter of the throttle tube section 12 is 16-17mm, preferably 16.8mm. The wall thickness of the measuring tube 1 is 2mm. The inner diameters of the front pipe section 11 and the rear pipe section 13 are determined according to the standard-size inner diameter of the existing medical blowing nozzle, namely, 20mm, so that the purpose of the design is that the medical disposable blowing nozzle needs to be matched for use in order to avoid cross infection of testers when a breath test experiment is carried out. By sizing the throttle segment 12, excessive differential pressure variations upstream and downstream of the throttle are avoided, affecting stable measurements of the fluid.
In order to accelerate production efficiency, the manufacturing accuracy is high, and the cost is low, a porous plate throttling element for a pulmonary function instrument is integrally formed through 3D printing.
Compared with a standard single-hole plate throttling piece, the multi-hole plate throttling piece is the same in measurement principle, and is different in that the multi-hole plate structure 4 can adjust the fluid balance of the multi-hole plate structure to an ideal state to the greatest extent, so that the characteristics of the differential pressure type flowmeter are exerted to a greater extent. The measuring principle of the porous plate throttling element is that a porous plate is arranged on the section of a pipeline, the porous plate structure 4 is equivalent to a disc rectifier, when fluid passes through the porous plate structure 4, vortex flow can be minimized, approximate ideal fluid is formed through balanced rectification, the fluid can form stable differential pressure at the upstream and downstream of the throttling element, the differential pressure is obtained through measurement of a pressure measuring device, and then the mass flow and the volume flow can be obtained through calculation according to the existing mass flow formula and volume flow formula.
In summary, the embodiment of the present utility model provides a porous plate throttling element for a pulmonary function instrument, where the porous plate throttling element for a pulmonary function instrument is provided with a porous plate structure 4 formed by a plate body 41, a first through hole 42 and a second through hole 43 in a measuring tube 1, and a plurality of second through holes 43 are uniformly distributed around the first through hole 42 on the plate body 41, when fluid passes through the porous plate structure 4, vortex flow is minimized, the fluid forms approximately ideal fluid through balance rectification, and the fluid forms stable differential pressure at the upstream and downstream of the throttling element, thereby reducing dead zone effect, reducing permanent pressure loss, reducing fluctuation of pressure sampling signals, and further being beneficial to realizing balance measurement of the fluid.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present application, and these modifications and substitutions should also be considered as being within the scope of the present application.
Claims (10)
1. A porous plate throttling element for a pulmonary function instrument, comprising a measuring tube, a front pressure taking nozzle and a rear pressure taking nozzle, wherein the measuring tube is provided with a fluid cavity, and the porous plate throttling element is characterized in that a porous plate structure positioned in the fluid cavity is arranged on the measuring tube; the porous plate structure comprises a plate body, a first through hole and a second through hole;
the aperture of the first through hole is larger than that of the second through hole; the first through hole is arranged at the center of the plate body; the second through holes are uniformly distributed on the plate body around the first through holes.
2. The porous plate restrictor of claim 1, wherein the central axis of the front and rear pressure taps lie on the same plane; the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle are perpendicular to the central axis of the measuring tube; the thickness of the plate body is smaller than the distance between the central axis of the front pressure taking nozzle and the central axis of the rear pressure taking nozzle.
3. A porous plate restrictor for a pulmonary function machine according to claim 2, characterized in that the distance between the central axis of the front pressure tap and the central axis of the rear pressure tap is 21-23mm.
4. A porous plate restrictor for a pulmonary function machine according to claim 3, characterized in that the distance between the central axis of the front and rear pressure taps is 22.5mm.
5. The porous plate restrictor of claim 1 wherein the measurement tube comprises a front tube section, a restrictor tube section, and a rear tube section; the front pipe section, the throttling pipe section and the rear pipe section are sequentially communicated from front to rear; the inner diameter of the front pipe section is the same as the inner diameter of the rear pipe section; the inner diameter of the front pipe section is larger than the inner diameter of the throttle pipe section.
6. The porous plate restrictor of claim 5, wherein the inner diameter of the front tube section is 20-22mm; the inner diameter of the throttling pipe section is 16-17mm.
7. The porous plate restrictor of claim 6, wherein the inner diameter of the front tube section is 20mm; the inner diameter of the throttle pipe section is 16.8mm.
8. The porous plate restrictor of claim 1, characterized in that the diameter of the first through hole is 9.5-10mm; the diameter of the second through hole is 2.8-3mm.
9. The porous plate restrictor of claim 8, characterized in that the diameter of the first through hole is 9.72mm; the diameter of the second through hole is 2.8mm.
10. The multi-plate orifice for a pulmonary function machine of claim 1, wherein the multi-plate orifice for a pulmonary function machine is integrally formed by 3D printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223506093.4U CN219035946U (en) | 2022-12-26 | 2022-12-26 | Porous plate throttling element for pulmonary function instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223506093.4U CN219035946U (en) | 2022-12-26 | 2022-12-26 | Porous plate throttling element for pulmonary function instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219035946U true CN219035946U (en) | 2023-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223506093.4U Active CN219035946U (en) | 2022-12-26 | 2022-12-26 | Porous plate throttling element for pulmonary function instrument |
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| Country | Link |
|---|---|
| CN (1) | CN219035946U (en) |
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2022
- 2022-12-26 CN CN202223506093.4U patent/CN219035946U/en active Active
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