WO2022110710A1 - Differential-pressure flow sensor and ventilator - Google Patents

Abstract

A differential-pressure flow sensor and a ventilator. The differential-pressure flow sensor comprises a main body (100) and a honeycomb structure (200). The main body (100) is provided with a flow channel (101) for air to circulate therein, wherein the flow channel (101) comprises an inflow section (102), an outflow section (103), and a throttling section (104) that communicates the inflow section (102) with the outflow section (103). The honeycomb structure (200) is mounted in the throttling section (104), wherein several through holes (201) are formed in the honeycomb structure (200), or the several through holes (201) are formed in the honeycomb structure (200) itself and in inner walls of the honeycomb structure (200) and the throttling section (104); the several through holes (201) are respectively in communication with the inflow section (102) and the outflow section (103); and any two adjacent through holes (201) share one through hole (201) wall. Any two adjacent through holes (201) share one through hole (201) wall, and the honeycomb structure (200) has very high stability due to the structural advantages thereof; therefore, the thickness of the through hole (201) wall shared by any two adjacent through holes (201) can be reduced as much as possible, and the linearity of the sensor can be thus improved, thereby improving the differential pressure resolution under a low flow, and making the measurement precision of the differential-pressure flow sensor higher.

Description

Differential pressure flow sensor and ventilator technical field

The present application relates to the technical field of differential pressure sensors, and in particular, to a differential pressure flow sensor and a ventilator.

Background technique

Due to the characteristics of the differential pressure flow sensor, 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.

technical problem

There is a contradiction, that is, the contradiction between the differential pressure resolution and the air resistance of the differential pressure flow sensor under low flow, which results in the inability to accurately measure the flow parameters under low flow.

technical solutions

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.

According to an aspect of the present application, a differential pressure flow sensor is provided, the 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.

As an embodiment of the present application, on a section perpendicular to the axis of the throttle section, any of the through holes formed by the honeycomb structure is a regular hexagon.

As an embodiment of the present application, along any axial direction of the through hole, the distance from the inner wall of the through hole toward the axis of the through hole gradually decreases and then gradually increases.

As an embodiment of the present application, 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.

As an embodiment of the present application, 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.

As an embodiment of the present application, 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.

As an embodiment of the present application, the honeycomb structure and the front end are integrally formed.

As an embodiment of the present application, 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.

As an embodiment of the present application, the first sampling tube is arranged on the front end, and the second sampling tube is arranged on the front end or the rear end.

According to another aspect of the present application, there is provided a ventilator comprising the differential pressure flow sensor as described in any of the above embodiments.

beneficial effect

Implementing the embodiments of the present application will have the following beneficial effects:

In the differential pressure flow sensor in this embodiment, 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.

Similarly, 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.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of the differential pressure flow sensor according to the first embodiment of the application;

2 is a cross-sectional view 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;

Among them: 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.

Embodiments of the present invention

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the accompanying drawings. However, the application may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the disclosure of this application is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIGS. 1 to 4 , 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 For airflow, 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.

Preferably, 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.

Specifically, 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. In this embodiment, 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.

Referring to FIG. 2 and FIG. 4 , in one embodiment, on a section perpendicular to the axis of the throttle section 104 , 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.

Preferably, the wall thickness of the through hole 201 is less than 0.5 mm. When the wall thickness of the through hole 201 is within this range, measurement accuracy at low flow rates can be ensured. Of course, when the stability of the honeycomb structure 200 is good enough, the smaller the wall thickness of the through hole 201, the better.

It should be noted that, on the cross section perpendicular to the axis of the throttle section 104, 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.

Preferably, 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.

In one embodiment, along any axial direction of the through hole 201 , the distance from the inner wall of the through hole 201 toward the axis thereof gradually decreases and then gradually increases. By setting the through hole 201 in this structure, when the air flow passes through the through hole 201, since the flow cross-sectional area of the through hole 201 changes, the air pressure value of the air flow flowing through the through hole 201 is more likely to change, and the present embodiment can be further improved. The resolution of the differential pressure flow sensor can be improved especially at low flow rates.

Please refer to FIG. 1 and FIG. 2 , in one embodiment, 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 .

Preferably, 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.

Of course, in some embodiments, the 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.

Referring to FIGS. 1 and 2 , in one embodiment, 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 . 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.

Preferably, 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 .

Of course, in order 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.

Referring to FIGS. 2 and 3 , in order to prevent the front end 110 and the rear end 120 from flowing adhesive into the flow channel 101 during bonding, in one embodiment, 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 . In this embodiment, 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.

It should be noted that, the 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.

Specifically, 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 .

In one embodiment, 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.

Of course, the 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.

Referring to FIG. 1 and FIG. 2 , in one embodiment, the first sampling tube 310 is disposed on the front end 110 , and the second sampling tube 320 is disposed on the front end 110 or the rear end 120 .

Preferably, 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 , and the second sampling tube 320 may also be integrally formed with the rear end 120 . When the second sampling tube 320 and the rear end 120 are integrally formed, and the first sampling tube 310 and the front end 110 are integrally formed, compared with the first sampling tube 310 and the second sampling tube 320 being integrally formed with the front end 110 , 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. Thus, the monitoring performance of the ventilator equipped with the differential pressure flow sensor is better, the use is safer, and the performance is better.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

A differential pressure flow sensor is characterized in that it includes a main body and a honeycomb structure, the main body has a flow channel for circulating gas, and the flow channel includes an inflow section, an outflow section, and a connection between the inflow section and the outflow section. throttling segment of the segment; 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. The differential pressure flow sensor according to claim 1, characterized in that, on a section perpendicular to the axis of the throttle section, any of the through holes formed by the honeycomb structure is a regular hexagon. The differential pressure flow sensor according to claim 2, characterized in that, along any axial direction of the through hole, the distance from the inner wall of the through hole toward the axis of the through hole gradually decreases and then gradually increases. The differential pressure flow sensor according to claim 1, further comprising a first sampling tube and a second sampling tube, the first sampling tube having a first sampling channel, and the second sampling tube having a second sampling tube A sampling channel, the first sampling channel communicates with the inflow section, and the second sampling channel communicates with the outflow section. The differential pressure flow sensor according to claim 4, wherein the distance between the first sampling pipe and the throttle section and the distance between the second sampling pipe and the throttle section equal. The differential pressure flow sensor according to claim 4, wherein the main body comprises 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 differential pressure flow sensor according to claim 6, wherein the honeycomb structure is integrally formed with the front end. The differential pressure flow sensor according to claim 6, wherein 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 concave ring. The convex ring is fitted into the groove, the convex ring is installed in the groove and is bonded with the inner wall of the groove. The differential pressure flow sensor according to claim 6, wherein the first sampling pipe is arranged on the front end, and the second sampling pipe is arranged on the front end or the rear end. A ventilator, characterized by comprising the differential pressure flow sensor according to any one of claims 1-9.