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WO2022110710A1 - Capteur d'écoulement à pression différentielle et ventilateur - Google Patents

Capteur d'écoulement à pression différentielle et ventilateur Download PDF

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Publication number
WO2022110710A1
WO2022110710A1 PCT/CN2021/096320 CN2021096320W WO2022110710A1 WO 2022110710 A1 WO2022110710 A1 WO 2022110710A1 CN 2021096320 W CN2021096320 W CN 2021096320W WO 2022110710 A1 WO2022110710 A1 WO 2022110710A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
honeycomb structure
flow sensor
differential pressure
pressure flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/096320
Other languages
English (en)
Chinese (zh)
Inventor
徐泽林
孟凡泗
尹鹏
邹海涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Comen Medical Instruments Co Ltd
Original Assignee
Shenzhen Comen Medical Instruments Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Comen Medical Instruments Co Ltd filed Critical Shenzhen Comen Medical Instruments Co Ltd
Publication of WO2022110710A1 publication Critical patent/WO2022110710A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical

Definitions

  • the present application relates to the technical field of differential pressure sensors, and in particular, to a differential pressure flow sensor and a ventilator.
  • the flow differential pressure curve is an upward concave parabola, the differential pressure increases rapidly with the increase of the flow rate, and the entire breathing tube has a certain resistance limit.
  • the purpose of the present application is to provide a differential pressure flow sensor and a ventilator capable of accurately measuring flow parameters under low flow.
  • a differential pressure flow sensor includes a main body and a honeycomb structure, the main body has a flow channel for circulating gas, the flow channel includes an inflow section, an outflow section, and a honeycomb structure. section and a throttle section connecting the inflow section and the outflow section;
  • the honeycomb structure is installed in the throttle section, and the honeycomb structure is formed with a number of through holes, or the honeycomb structure itself, the honeycomb structure and the inner wall of the throttle section are formed with a number of through holes, and a number of through holes are formed in the honeycomb structure itself, the honeycomb structure and the inner wall of the throttle section.
  • the through holes communicate with the inflow section and the outflow section respectively, and any two adjacent through holes share one through hole wall.
  • any of the through holes formed by the honeycomb structure is a regular hexagon.
  • the distance from the inner wall of the through hole toward the axis of the through hole gradually decreases and then gradually increases.
  • it further includes a first sampling tube and a second sampling tube, the first sampling tube has a first sampling channel, the second sampling tube has a second sampling channel, and the first sampling channel In communication with the inflow section, the second sampling channel is in communication with the outflow section.
  • the distance between the first sampling pipe and the throttle section is equal to the distance between the second sampling pipe and the throttle section.
  • the main body includes a front end and a rear end, the front end is fixed on the rear end, and the throttle section is formed on the front end.
  • the honeycomb structure and the front end are integrally formed.
  • the end face of the front end facing the rear end extends toward the rear end to form a convex ring, and the end face of the rear end facing the front end is recessed to form a groove adapted to the convex ring,
  • the protruding ring is installed in the groove and is bonded with the inner wall of the groove.
  • the first sampling tube is arranged on the front end
  • the second sampling tube is arranged on the front end or the rear end.
  • a ventilator comprising the differential pressure flow sensor as described in any of the above embodiments.
  • a honeycomb structure is installed in the throttle section, and among the several through holes on the honeycomb structure, since any two adjacent through holes share a through hole wall, the honeycomb structure Due to the advantages of its own structure, its stability is very high, so that the thickness of the through-hole wall shared by any two adjacent through-holes can be reduced as much as possible, thereby improving the linearity of the sensor, thereby improving the low flow rate.
  • the differential pressure resolution increases the measurement accuracy of the differential pressure flow sensor in this embodiment.
  • the ventilator using the differential pressure flow sensor in this embodiment can also improve the accurate measurement of various parameters of the patient using the ventilator, and improve the performance of the ventilator.
  • FIG. 1 is a schematic structural diagram of the differential pressure flow sensor according to the first embodiment of the application
  • Fig. 3 is the structural representation at A place in Fig. 2;
  • FIG. 4 is a schematic structural diagram of the differential pressure flow sensor in FIG. 1 from a viewing angle
  • 100 main body; 101, flow channel; 102, inflow section; 103, outflow section; 104, throttle section; 110, front end; 111, convex ring; 120, rear end; 121, groove; 200, honeycomb structure 310, the first sampling tube; 311, the first sampling channel; 320, the second sampling tube; 321, the second sampling channel.
  • an embodiment of the present application provides a differential pressure flow sensor.
  • the differential pressure flow sensor in this embodiment includes a main body 100 and a honeycomb structure 200 , and the main body 100 has a flow for circulating gas.
  • Channel 101, the flow channel 101 is divided into at least three sections, namely the inflow section 102, the outflow section 103 and the throttle section 104 connecting the inflow section 102 and the outflow section 103, the inflow section 102 is used for input air flow, and the outflow section 103 is used for output
  • the required parameters can be measured by taking the air pressure values at the inlet and outlet ends of the throttling section 104 respectively.
  • the honeycomb structure 200 is installed in the throttling section 104 to improve the measurement accuracy of the differential pressure flow sensor.
  • the flow channel 101 has a symmetrical shape with respect to its axis center, so as to ensure the stability of the flow through the flow channel 101 to improve the measurement accuracy.
  • the honeycomb structure 200 is formed with a number of through holes 201, or the honeycomb structure 200 itself and the inner walls of the honeycomb structure 200 and the throttle section 104 are formed with a number of through holes 201, that is, the through holes 201 may be only the honeycomb structure 200 itself. It can also include through holes 201 formed by the honeycomb structure 200 and the inner wall of the throttle section 104. Several through holes 201 are respectively connected to the inflow section 102 and the outflow section 103, and any two adjacent through holes 201 share one through hole. 201 Wall.
  • the honeycomb structure 200 is installed in the throttle section 104, and among the several through holes 201 on the honeycomb structure 200, since any two adjacent through holes 201 share a wall of the through hole 201, the honeycomb structure Due to the advantages of its own structure, the 200 has high stability, so that the thickness of the wall of the through hole 201 shared by any two adjacent through holes 201 can be reduced as much as possible, thereby improving the linearity of the differential pressure flow sensor. , thereby improving the differential pressure resolution under low flow rate, and making the measurement accuracy of the differential pressure flow sensor in this embodiment higher.
  • any through hole 201 formed by the honeycomb structure 200 is a regular hexagon.
  • the honeycomb structure 200 in this embodiment can form more through holes 201 while saving materials, and because of the high structural stability, the walls of the through holes 201 can be made relatively thinner, which is more conducive to improving the differential pressure flow sensor. Therefore, the differential pressure resolution under low flow rate is improved, and the measurement accuracy of the differential pressure flow sensor in this embodiment is higher.
  • the wall thickness of the through hole 201 is less than 0.5 mm.
  • the wall thickness of the through hole 201 is within this range, measurement accuracy at low flow rates can be ensured.
  • the stability of the honeycomb structure 200 is good enough, the smaller the wall thickness of the through hole 201, the better.
  • the through hole 201 may also be triangular, square or other shapes, etc., wherein the cross section of the through hole 201 is an equilateral triangle is also a preferred embodiment.
  • the wall thickness of any position of the through hole 201 is equal, so that the stability of the airflow flowing through the through hole 201 is better, and the test accuracy is higher, and the test result will not be greatly affected by the deviation of the test position. big change.
  • the distance from the inner wall of the through hole 201 toward the axis thereof gradually decreases and then gradually increases.
  • the differential pressure flow sensor further includes a first sampling tube 310 and a second sampling tube 320 , the first sampling tube 310 has a first sampling channel 311 , and the second sampling tube 320 There is a second sampling channel 321 , the first sampling channel 311 communicates with the inflow section 102 , and the second sampling channel 321 communicates with the outflow section 103 .
  • the inlet end of the throttle section 104 can be measured through the first sampling channel 311 , and the outlet end of the throttle section 104 can be measured through the second sampling channel 321 .
  • the distance between the first sampling tube 310 and the throttle section 104 is equal to the distance between the second sampling tube 320 and the throttle section 104 .
  • the first sampling tube 310 and the second sampling tube 320 in this embodiment are symmetrical about the throttle section 104, so that users can measure in both directions, which increases the convenience of installation of the differential pressure flow sensor in this embodiment.
  • first sampling tube 310 and the second sampling tube 320 may also be arranged symmetrically with respect to the throttling section 104, and may be arranged at positions where measurement is required according to requirements.
  • the main body 100 includes a front end 110 and a rear end 120 , the front end 110 is fixed on the rear end 120 , and the throttle section 104 is formed on the front end 110 .
  • the main body 100 By arranging the main body 100 into two parts, it can be easily separated and produced separately, and then assembled, which can reduce the difficulty of manufacturing.
  • the front end 110 and the rear end 120 are bonded by adhesive, so as to increase the tightness of the connection between the front end 110 and the rear end 120 .
  • a sealing ring (not shown in the figure) may also be provided between the front end 110 and the rear end 120 to further enhance the tightness of the connection between the front end 110 and the rear end 120 , improve the measurement accuracy.
  • the end face of the front end 110 toward the rear end 120 extends toward the rear end 120 to form a convex Ring 111
  • the end face of rear end 120 toward front end 110 is recessed to form a groove 121 adapted to the convex ring 111 .
  • glue by pouring glue into the groove 121, the bonding between the convex ring 111 and the inner wall of the groove 121 is realized. Due to the limiting effect of the convex ring 111 on the glue, it can largely prevent the glue pouring.
  • the adhesive flows into the flow channel 101 , thereby avoiding the influence of the adhesive flowing into the flow channel 101 on the measurement accuracy.
  • front end 110 and the rear end 120 in this embodiment may also be detachably connected, so as to facilitate maintenance or replacement of components.
  • the front end 110 and the rear end 120 may be connected by interference, wherein a sealing ring is provided at the part where the front end 110 and the rear end 120 are connected to ensure the sealing of the connection between the front end 110 and the rear end 120 .
  • the front end 110 and the honeycomb structure 200 are integrally formed, thereby ensuring the stability and uniformity between the front end 110 and the honeycomb structure 200, and can improve the consistency of the differential pressure flow sensor in this embodiment. to improve its measurement accuracy.
  • honeycomb structure 200 and the front end 110 can also be detachably connected to facilitate replacement or maintenance of the honeycomb structure 200 , and the honeycomb structure 200 with through holes 201 with different wall thicknesses can also be replaced according to user requirements.
  • the first sampling tube 310 is disposed on the front end 110
  • the second sampling tube 320 is disposed on the front end 110 or the rear end 120 .
  • the first sampling tube 310 is integrally formed with the front end 110
  • the second sampling tube 320 may be integrally formed with the front end 110
  • the second sampling tube 320 may also be integrally formed with the rear end 120 .
  • the production process is simpler and more convenient.
  • An embodiment of the present application also provides a ventilator.
  • the ventilator in this embodiment includes the differential pressure flow sensor in any of the above embodiments, because the linearity of the differential pressure flow sensor in the above embodiment is better , which effectively solves the contradiction between the differential pressure resolution and the air resistance of the differential pressure flow sensor under low flow, and improves the measurement accuracy under low flow.
  • the monitoring performance of the ventilator equipped with the differential pressure flow sensor is better, the use is safer, and the performance is better.

Landscapes

  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Volume Flow (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Capteur d'écoulement à pression différentielle et ventilateur. Le capteur d'écoulement à pression différentielle comporte un corps principal (100) et une structure en nid d'abeilles (200). Le corps principal (100) est doté d'un canal d'écoulement (101) qui permet à l'air d'y circuler, le canal d'écoulement (101) comprenant une section d'entrée (102), une section de sortie (103) et une section d'étranglement (104) qui fait communiquer la section d'entrée (102) avec la section de sortie (103). La structure en nid d'abeilles (200) est montée dans la section d'étranglement (104), de nombreux trous traversants (201) étant formés dans la structure en nid d'abeilles (200), ou les nombreux trous traversants (201) étant formés dans la structure en nid d'abeilles (200) elle-même et dans les parois internes de la structure en nid d'abeilles (200) et la section d'étranglement (104); les nombreux trous traversants (201) sont respectivement en communication avec la section d'entrée (102) et la section de sortie (103); deux trous traversants adjacents quelconques (201) partagent une paroi de trou traversant (201). Deux trous traversants adjacents quelconques (201) partagent une paroi de trou traversant (201), et la structure en nid d'abeilles (200) présente une très grande stabilité en raison de ses avantages structuraux; par conséquent, l'épaisseur de la paroi de trou traversant (201) partagée par deux trous traversants adjacents quelconques (201) peut être réduite autant que possible, et la linéarité du capteur peut être ainsi améliorée, ce qui permet d'améliorer la résolution de pression différentielle en cas de faible débit, et d'augmenter la précision de mesure du capteur d'écoulement à pression différentielle.
PCT/CN2021/096320 2020-11-30 2021-05-27 Capteur d'écoulement à pression différentielle et ventilateur Ceased WO2022110710A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011369888.8A CN112546367A (zh) 2020-11-30 2020-11-30 压差式流量传感器及呼吸机
CN202011369888.8 2020-11-30

Publications (1)

Publication Number Publication Date
WO2022110710A1 true WO2022110710A1 (fr) 2022-06-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/096320 Ceased WO2022110710A1 (fr) 2020-11-30 2021-05-27 Capteur d'écoulement à pression différentielle et ventilateur

Country Status (2)

Country Link
CN (1) CN112546367A (fr)
WO (1) WO2022110710A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112546367A (zh) * 2020-11-30 2021-03-26 深圳市科曼医疗设备有限公司 压差式流量传感器及呼吸机

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WO2003080218A1 (fr) * 2002-03-25 2003-10-02 Ngk Insulators, Ltd. Filtre en nid d'abeille
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CN209827861U (zh) * 2019-01-16 2019-12-24 深圳融昕医疗科技有限公司 流量传感器及具有该流量传感器的呼吸机
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080218A1 (fr) * 2002-03-25 2003-10-02 Ngk Insulators, Ltd. Filtre en nid d'abeille
CN101311683A (zh) * 2007-12-29 2008-11-26 北京谊安医疗系统股份有限公司 呼吸机及其低差压式流量检测机构
CN202010163U (zh) * 2011-01-28 2011-10-19 北京谊安医疗系统股份有限公司 流量采样探头及包括其的流量采样组件
KR101340536B1 (ko) * 2011-11-25 2013-12-11 주식회사 하이트롤 코니컬 오리피스형 차압식 유량 측정장치
KR20140133421A (ko) * 2013-05-10 2014-11-19 가부시키가이샤 테지케 유량 센서
CN203772341U (zh) * 2013-12-31 2014-08-13 北京怡和嘉业医疗科技有限公司 用于流量检测的稳流装置和检测装置
CN104721929A (zh) * 2015-03-24 2015-06-24 湖南明康中锦医疗科技发展有限公司 一种呼吸机截流装置
CN204563193U (zh) * 2015-03-24 2015-08-19 湖南明康中锦医疗科技发展有限公司 一种呼吸机截流装置
CN108318090A (zh) * 2018-01-22 2018-07-24 重庆市环境科学研究院 适用于大口径管道流量测量的流量计
CN208988881U (zh) * 2018-07-18 2019-06-18 河北冀德远健医疗器械科技有限公司 一种用于肺功能评测的压差发生器
CN210583400U (zh) * 2019-09-23 2020-05-22 吉林市人民医院 一种用于呼吸机的过滤组件
CN110681015A (zh) * 2019-11-22 2020-01-14 湖南万脉医疗科技有限公司 一种呼吸机采样结构
CN111238581A (zh) * 2020-03-12 2020-06-05 知心健(南京)科技有限公司 一种用于气体流量采集的周边取样压差传感器
CN112546367A (zh) * 2020-11-30 2021-03-26 深圳市科曼医疗设备有限公司 压差式流量传感器及呼吸机

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