CN215811009U

CN215811009U - Gas flow sensor for measuring medium and low flow velocity

Info

Publication number: CN215811009U
Application number: CN202122355022.8U
Authority: CN
Inventors: 何云琦; 雷世安; 刘伟; 成启通
Original assignee: Bosifa Technology Shenzhen Co ltd
Current assignee: Bosifa Technology Shenzhen Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-02-11
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses a gas flow sensor for measuring medium and low flow rates, which comprises a shell, a cover body and a circuit board with an induction probe, wherein a first opening is formed in one end part of the shell, the cover body covers the shell and is positioned at the position of the first opening, the circuit board is installed on the first opening, sampling pipelines penetrate through two adjacent end parts of the shell at the first opening, an airflow channel is arranged on each sampling pipeline, and a gas inlet and a gas outlet are formed in each airflow channel, so that air can enter from the gas inlet and then be discharged from the gas outlet; wherein, be equipped with the water conservancy diversion spare that the shape is wing section on the sampling pipeline, the one end of water conservancy diversion spare is connected on the lateral wall of sampling pipeline, the other end of water conservancy diversion spare extends to first opening for gas can be followed the water conservancy diversion spare flow through with the inductive probe that first opening position set up relatively.

Description

Gas flow sensor for measuring medium and low flow velocity

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a gas flow sensor for measuring medium and low flow rates.

Background

At present, most of gas flow sensors adopt a bypass structure mode, the flow value of gas is measured by sampling the air flow of a bypass, the general design of an air passage of the bypass has a small sectional area, water condensation is easily caused, the error of the measured flow value is large, the bypass is not easy to clean, and the using effect is greatly influenced.

The gas flow sensor is an important device for the working condition of the breathing machine, and the patient often contains more foreign matters and gas with larger humidity in expiration, so that the flow sensor is easy to block, the flow sensor cannot work normally, and meanwhile, the life safety of the patient is influenced by larger error.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas flow sensor for measuring medium and low flow velocity, which can ensure the stability of gas flow measurement and stable signals through a straight-through gas flow channel, and can not block a first opening 13 serving as a signal measuring hole, thereby ensuring the life safety of a patient and being convenient to disassemble and clean.

The utility model provides a gas flow sensor, which comprises a shell, a cover body and a circuit board with an induction probe, wherein one end part of the shell is provided with a first opening, the cover body covers the position of the shell at the first opening, the circuit board is arranged on the first opening, two adjacent end parts of the shell at the first opening are penetrated with a sampling pipeline, the sampling pipeline is provided with an airflow channel, and the airflow channel is provided with a gas inlet and a gas outlet, so that air can enter from the gas inlet and then is discharged from the gas outlet;

wherein, be equipped with the water conservancy diversion spare that the shape is wing section on the sampling pipeline, the one end of water conservancy diversion spare is connected on the lateral wall of sampling pipeline, the other end of water conservancy diversion spare extends to first opening for gas can be followed the water conservancy diversion spare flow through with the inductive probe that first opening position set up relatively.

In the gas flow sensor of the present invention, the housing is provided with a first cavity with an opening, the first opening is disposed on the first cavity and is communicated with the gas flow channel, the cover covers the opening of the first cavity, and the circuit board is mounted in the first cavity.

In the gas flow sensor of the present invention, the first opening has an elliptical structure, a length direction of the elliptical structure is parallel to or coincides with an axial direction of the sampling pipe, and two flat ends of the flow guide member are arranged along the length direction of the first opening.

In the gas flow sensor according to the present invention, the cross section of the flow guide has an elliptical shape having a first major axis and a first minor axis, the length of the first major axis gradually decreases toward the first opening to form a climbing structure, and the length of the first minor axis gradually increases toward the first opening.

In the gas flow sensor of the present invention, the width of the ramp structure gradually increases toward the first opening.

In the gas flow sensor of the present invention, the cover body is provided with at least one protruding portion having a locking groove, the housing is provided with a number of locking buckles matched with the protruding portion, and the locking groove is locked with the locking buckle.

In the gas flow sensor according to the present invention, the number of the protrusions is three, and the three protrusions are respectively provided on three adjacent side edges of the cover body.

In the gas flow sensor of the present invention, the cover body is provided with a limiting member, and the limiting member is disposed on a side different from the three protrusions.

In the gas flow sensor of the present invention, the housing is provided with a guide groove, and the shape and size of the guide groove are adapted to the shape and size of the projection.

In the gas flow sensor of the present invention, the gas flow sensor further includes a sealing member, a sealing member mounting groove is provided at the bottom of the first cavity, and the sealing member is mounted in the sealing member mounting groove and abuts against the circuit board.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs a measure gas flow sensor of well low velocity of flow, including casing, lid and the circuit board that has inductive probe, wherein, be equipped with the sampling pipeline that runs through two tip on the casing, be equipped with airflow channel on the sampling pipeline for gas flow sensor can guarantee through the airflow channel of direct mode that airflow measurement's is stable, the signal is stable, can not plug up the first opening 13 as the signal measurement hole again, in order to guarantee patient's life safety, convenient to detach gets off the washing simultaneously.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a gas flow sensor according to an embodiment of the present application;

FIG. 2 is an exploded schematic view of the gas flow sensor of FIG. 1 at another angle;

FIG. 3 is an exploded schematic view of the gas flow sensor of FIG. 1;

FIG. 4 is a schematic structural view of the cover of FIG. 1;

FIG. 5 is a schematic view of the cover of FIG. 1 at another angle;

FIG. 6 is a schematic structural view of the housing of FIG. 1

FIG. 7 is a schematic view of a portion of the housing of FIG. 1;

fig. 8 is a schematic view of the construction of the baffle member of fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only, and it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description only, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

As shown in fig. 1 to 8, the present application provides a gas flow sensor for measuring medium and low flow rates, which includes a housing 10, a cover 20 and a circuit board with an inductive probe, wherein one end of the housing 10 is provided with a first opening 13, the cover 20 covers the housing 10 at the position of the first opening 13, and the circuit board is mounted on the first opening 13.

In this embodiment, the sampling pipes 11 penetrate through two adjacent end portions of the first opening 13 of the housing 10, the sampling pipes 11 are provided with the airflow channel 111, and the airflow channel 111 is provided with the gas inlet and the gas outlet, so that air can enter from the gas inlet and then be discharged from the gas outlet, a straight-through design of the airflow channel 111 is realized, and the first opening 13, namely the signal measuring hole, is prevented from being blocked.

Wherein, be equipped with on the sampling pipe 11 and be the water conservancy diversion spare 14 that the shape is the wing section, the one end of water conservancy diversion spare 14 is connected on the lateral wall of sampling pipe 11, and the other end of water conservancy diversion spare 14 extends to first opening 13 for gas can follow the surface of water conservancy diversion spare 14 flow through the inductive probe who sets up with first opening 13 position relatively, and inductive probe is used for detecting the wind speed of air current.

Illustratively, the air flows form air flows through the air flow passage 111, wherein a small amount of air flows pass through the air flow passage 111 and reach the end surface platform 141 of the air flow member 14 at the first opening 13 after climbing along the air flow member 14, then the air flows pass through the surface of the induction probe, and the rest air flows pass through the air flow passage 111 and smoothly flow out from the air outlet.

In an alternative embodiment, the housing 10 is provided with an open first cavity 12, the first opening 13 is disposed on the first cavity 12 and is communicated with the airflow channel 111, the cover 20 covers the open of the first cavity 12, and the circuit board is mounted in the first cavity 12 to avoid direct contact with the outside, so as to protect the circuit board.

In an alternative embodiment, the first opening 13 has an oval configuration, wherein the length direction of the oval configuration is parallel to or coincides with the axial direction of the sampling tube 11, and the two flat ends of the flow guide 14 are arranged along the length direction of the first opening 13.

Illustratively, the cross section of the flow guiding member 14 is an ellipse, and the ellipse has a first major axis and a first minor axis, wherein the length of the first major axis gradually decreases toward the first opening 13 to form a climbing structure 142, and the length of the first minor axis gradually increases toward the first opening 13, and finally the stroke of the platform 141 on the end surface is similar to a rectangular structure.

Specifically, the flow guiding element 14 includes an airflow rectifying strip, a climbing structure 142 and an end surface platform 141, the airflow rectifying strip, the climbing structure 142 and the end surface platform 141 form a shape similar to an airplane wing, and the wing-shaped structure spans two sides of the airflow channel 111 to provide a gas isolation space for the sensing probe, thereby ensuring smoothness of gas flowing through the isolation space.

The whole wing-shaped structure enables airflow flowing through the airflow channel 111 to pass smoothly, the climbing structure 142 is a flat slope and can guide the airflow to pass through the isolation space so as to ensure that the airflow is fluidized by layers as much as possible, the rest airflow is split into the airflow channel 111, most of the airflow flows through the airflow channel 111, and the airflow rectifying strips can enable most of the airflow not to generate sudden counter pressure so as to avoid further fluctuation of the airflow.

In an alternative embodiment, the width of the ramp structure 142 gradually increases toward the first opening 13.

In an alternative embodiment, the cover 20 is provided with at least one protrusion 21 having a locking groove 211, the housing 10 is provided with a number of fasteners 16 matching the number of the protrusions 21, and the locking groove 211 is engaged with the fasteners 16 for mounting the cover 20 on the housing 10.

Illustratively, the number of the protrusions 21 is three, and three protrusions 21 are respectively disposed on three adjacent sides of the cover 20 to ensure the stability of the connection between the cover 20 and the housing 10.

In an alternative embodiment, the cover 20 is provided with a limiting member 22, wherein the limiting member 22 is disposed on a different side from the three protrusions 21, the housing 10 is provided with a limiting groove 15, and the limiting member 22 is located in the limiting groove 15 to perform a limiting function. In addition, the output end of the circuit board is just accommodated in the cavity formed by the limiting member 22 and the limiting groove 15.

In an alternative embodiment, the housing 10 is provided with a guide groove, the shape and size of the guide groove are matched with the shape and size of the protruding portion 21, and one side of the guide groove close to the end surface is provided with an inclined surface, so that the cover 20 can quickly snap the clamping groove 211 and the buckle 16 along the guide groove through the protruding portion 21 to complete the assembly of the cover 20 and the housing 10, and the inclined surface plays a guiding role.

In an alternative embodiment, a labyrinth structure is formed between the cover 20 and the housing 10, so as to prevent liquid such as water from entering the first cavity 12 through a gap at a joint between the cover 20 and the housing 10, which may cause short circuit or some functional failures of electronic devices on the printed circuit board, thereby achieving a waterproof effect.

Specifically, one of the cover 20 and the housing 10 is provided with a first mounting table, the other of the cover 20 and the housing 10 is provided with a first mounting groove, the cover 20 and the housing 10 form a labyrinth structure through the cooperation of the first mounting table and the first mounting groove, so that liquids such as water can be effectively prevented from entering the first cavity 12 through a gap at the joint of the cover 20 and the housing 10, which causes short circuit or certain functional failures of electronic devices on the printed circuit board, and a waterproof effect is achieved.

In an alternative embodiment, the gas flow sensor further comprises a sealing member, and the bottom of the first cavity 12 is provided with a sealing member mounting groove, and the sealing member is mounted in the sealing member mounting groove and abutted against the circuit board to prevent the gas flow from flowing out from the connection position of the housing 10 and the circuit board.

In an alternative embodiment, the cover 20 is further provided with a display window 23 for displaying the related detection data of the gas flow sensor

After the technical scheme is adopted, the cleaning is convenient, water condensation is not easy to generate, the flowing of the air flow is smoother, and the gas turbulence can be effectively inhibited.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A gas flow sensor for measuring medium and low flow rates is characterized by comprising a shell, a cover body and a circuit board with an induction probe, wherein a first opening is formed in one end of the shell, the cover body covers the shell and is positioned at the position of the first opening, the circuit board is installed on the first opening, sampling pipelines penetrate through two adjacent ends of the shell at the first opening, an airflow channel is arranged on each sampling pipeline, and a gas inlet and a gas outlet are formed in each airflow channel, so that air can enter from the gas inlet and then be discharged from the gas outlet;

2. The gas flow sensor according to claim 1, wherein the housing has a first cavity with an opening, the first opening is disposed on the first cavity and is communicated with the gas flow channel, the cover covers the opening of the first cavity, and the circuit board is mounted in the first cavity.

3. The gas flow sensor according to claim 2, wherein the first opening has an oval configuration, the length direction of the oval configuration is parallel to or coincides with the axial direction of the sampling pipe, and the two flat ends of the flow guide are disposed along the length direction of the first opening.

4. The gas flow sensor according to claim 2, wherein the flow guide has an oval shape in cross section, the oval shape having a first major axis and a first minor axis, the length of the first major axis gradually decreasing in a direction toward the first opening to form a ramp structure, and the length of the first minor axis gradually increasing in a direction toward the first opening.

5. The gas flow sensor according to claim 4, wherein a width of the ramp structure gradually increases toward the first opening.

6. The gas flow sensor according to claim 1, wherein the cover has at least one protrusion with a locking groove, and the housing has a number of locking tabs matching the number of protrusions, and the locking groove is engaged with the locking tabs.

7. The gas flow sensor according to claim 6, wherein the number of the projections is three, and three of the projections are provided on three adjacent sides of the cover, respectively.

8. The gas flow sensor according to claim 7, wherein a stopper is provided on the cover, and the stopper is provided on a side different from the three bosses.

9. The gas flow sensor according to claim 7, wherein the housing is provided with a guide groove having a shape and size adapted to the shape and size of the protrusion.

10. The gas flow sensor according to claim 2, further comprising a seal member, wherein a bottom of the first cavity is provided with a seal member mounting groove, and the seal member is mounted in the seal member mounting groove and abuts against the circuit board.