CN112857482A

CN112857482A - Screen and differential pressure testing device

Info

Publication number: CN112857482A
Application number: CN202110316620.6A
Authority: CN
Inventors: 邓锐
Original assignee: Medcaptain Medical Technology Co Ltd
Current assignee: Medcaptain Medical Technology Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-05-28

Abstract

A screen mesh and a differential pressure test device, the screen mesh comprises a first mesh yarn, a second mesh yarn and a third mesh yarn arranged in sequence, and the materials of the first mesh yarn, the second mesh yarn and the third mesh yarn all have Extensibility, and the middle of the second mesh is provided with a first through hole, and the first mesh and the third mesh cover the first through hole. By arranging a screen structure formed by stacking the first, second and third mesh yarns with ductility in sequence, and making the second mesh yarn an annular structure with a first through hole in the middle, Reasonable design of the size of the first through hole is beneficial to improve the test accuracy of the differential pressure test device.

Description

Screen and differential pressure testing device

Technical Field

The invention relates to the technical field of gas detection equipment, in particular to a screen and a pressure difference testing device.

Background

The differential pressure sensor as one widely used flow sensor can detect the pressure difference between the front and back ends of some equipment or part in real time, and has the principle that one layer of screen-shaped isolating net is set on the flow rate sensor, the airflow is resisted by the net to reduce the flow rate and consequently the pressure at the other end of the net is slightly reduced, and the pressure drop difference is formed between the two ends of the net, so as to obtain the flow-volume curve and the volume-time curve. However, water vapor in the air flow is easy to condense and deposit on the screen-shaped separation net to block the screen, the cleaning and the disinfection of the separation net are difficult, and the error of the differential pressure sensor is large during high flow measurement.

At present, the most widely used technology is heating the screen and other technologies to improve the precision and the defects of the screen, however, as a core component of the sensor, aiming at the existing screen structure, the effect of improving the test precision by adopting the technology of heating the screen is not obvious, and the test precision of the differential pressure sensor is still low.

Disclosure of Invention

The invention aims to provide a screen and a differential pressure testing device, which are beneficial to improving the testing precision of the differential pressure testing device.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the invention provides a screen, which comprises a first gauze, a second gauze and a third gauze which are sequentially stacked, wherein the first gauze, the second gauze and the third gauze are made of ductile materials, a first through hole is formed in the middle of the second gauze, and the first gauze and the third gauze cover the first through hole.

In one embodiment, the screen panel further includes a fixing member in an annular shape, edges of the first gauze, the second gauze and the third gauze are connected and fixed by the fixing member, and the first gauze, the second gauze and the third gauze are tightened by the fixing member to be in a tightened state.

In one embodiment, the fixing part comprises a first adjusting part and a second adjusting part which are opposite, the first adjusting part is arranged on one side, back to the second gauze, of the first gauze, the second adjusting part is arranged on one side, back to the second gauze, of the third gauze, and the first adjusting part and the second adjusting part are fixedly connected.

In one embodiment, the first adjusting member is provided with a first pressing portion, the second adjusting member is provided with a second pressing portion, and the first pressing portion and the second pressing portion are correspondingly connected to tighten the screen.

In one embodiment, the number of the first stitching parts is plural, and the plural first stitching parts are arranged at intervals on a straight line of the first gauze extending from the center to the periphery.

In one embodiment, the first nip is connected end to end in a circumferential direction of the first gauze to form a ring shape.

In one embodiment, the first pressing portion is a protrusion, and the second pressing portion is a groove.

In one embodiment, the first adjusting member is provided with a first main body part, one end of the first main body part is connected with the first pressing part, and the other end of the first main body part extends to the edge of the first gauze, the second adjusting member is provided with a second main body part, one end of the second main body part is connected with the second pressing part, and the other end of the second main body part extends to the edge of the first gauze, and the second main body part is connected with the first main body part so as to tightly press and fix the first gauze, the second gauze and the third gauze.

In one embodiment, the first, second and third screen yarns are each 1 or more layers in number.

In a second aspect, the present invention provides a differential pressure testing apparatus comprising a screen according to any one of the embodiments described above.

Through setting up the screen cloth structure that is formed by first gauze, second gauze and the third gauze that have the ductility range upon range of in proper order, and make the second gauze be the annular structure that the middle part was provided with first through-hole, carry out rational design through the size to first through-hole, be favorable to improving pressure differential testing arrangement's test accuracy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a gauze construction according to an embodiment;

FIG. 2 is a schematic diagram of the overall structure of a screen panel according to one embodiment;

FIG. 3 is a cross-sectional view of one embodiment of a screen;

FIG. 4 is a cross-sectional view of another embodiment of a screen;

FIG. 5 is a schematic structural diagram of a differential pressure testing apparatus according to an embodiment;

FIG. 6 is a schematic structural diagram of a differential pressure test apparatus according to another embodiment;

FIG. 7 is a schematic view of a gauze construction according to another embodiment;

fig. 8 is a schematic view of a gauze structure according to another embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides a screen mesh 00, please refer to fig. 1 and 2, the screen mesh 00 comprises a first gauze 10, a second gauze 20 and a third gauze 30 which are sequentially stacked, wherein the edges of the first gauze 10, the second gauze 20 and the third gauze 30 are connected at one time, the middle part of the second gauze 20 is provided with a first through hole 21, and the first gauze 10 and the third gauze 30 cover the first through hole 21. In this embodiment, the screen 00 is only illustrated as a circular structure, and in other embodiments, the screen 00 may also be an oval, a triangle, a rectangle, or any other polygon to match with the differential pressure testing apparatus. The shape of the first through hole 21 can also be designed to be oval, triangular, rectangular or any other polygon according to actual requirements.

When the air flow needs to be tested, the air flow enters the screen 00 from the first gauze 10 and has a first pressure, the air flow passes through the second gauze 20 and flows out of the third gauze 30, after the resistance action of the first gauze 10, the second gauze 20 and the third gauze 30, the air flow pressure value is reduced to a second pressure, and the required pressure difference can be obtained by comparing the difference value of the first pressure and the second pressure. It will be appreciated that the first and

second veils

10 and 20 are of the same construction, and in other embodiments, the flow of air may be in the order of entering the screen 00 from the third veil 30 and exiting the screen 00 from the first veil 10. Specifically, the second gauze 20 further includes a ring structure 22, and when the size of the first through hole 21 is different, the test accuracy of the differential pressure test device is also different. When the size of the first through hole 21 is large, the area of the annular structure 22 is small, the contact area between the airflow and the second gauze 20 is small, the blocking effect of the second gauze 20 on the airflow is small, and the difference between the second pressure and the first pressure is small, when the size of the first through hole 20 is small, the area of the annular structure 22 is large, the contact area between the airflow and the second gauze 20 is large, the blocking effect of the second gauze 20 on the airflow is large, the loss of the airflow after being filtered by the second gauze 20 is large, the difference between the second pressure and the first pressure is large, the blocking effect of the screen 00 on the airflow is more obvious, and therefore the testing precision of the differential pressure testing device is improved.

In addition, when the air current passes through the second screen 20, since the middle portion of the second screen 20 is a through hole structure, only the annular structure 22 of the second screen 20 is in contact with the air current, thereby reducing the area on the second screen 20 where the water vapor in the air current condenses, avoiding the problem of blocking the screen 00 with the water vapor, and not requiring cleaning of the second screen 20.

Through setting up the screen cloth 00 structure that is formed by first gauze 10, second gauze 20 and third gauze 30 range upon range of in proper order, and make second gauze 20 be the annular structure that the middle part was provided with first through-hole 21, through designing the size to first through-hole 21, be favorable to improving pressure differential testing arrangement's test accuracy.

In one embodiment, referring to fig. 2 and 3, the screen panel 00 further includes a fixing member 40 having a ring shape, edges of the first gauze 10, the second gauze 20 and the third gauze 30 are flush, and the fixing member 40 fixes the first gauze 10, the second gauze 20 and the third gauze 30 by pressing the edges of the first gauze 10, the second gauze 20 and the third gauze 30, so as to prevent any one of the gauzes from moving when being subjected to an external force, thereby affecting a test result. In addition, the first gauze 10, the second gauze 20 and the third gauze 30 all have ductility, such as plastic or metal. When the airflow flux of the differential pressure testing device per unit time needs to be increased, the fixing member 40 applies a pulling force in a direction from the center to the periphery to the edges of the first gauze 10, the second gauze 20 and the third gauze 30, the warp threads and the weft threads of the first gauze 10, the second gauze 20 and the third gauze 30 extend to the periphery, and the fixing member 40 tightens the first gauze 10, the second gauze 20 and the third gauze 30 by the fixing member 40, so that the deposition of water vapor in the airflow on the screen mesh 00 is less. When it is required to reduce the air flow rate per unit time of the differential pressure test apparatus, the first, second, and

third screen yarns

10, 20, and 30 are reduced in the spread state by reducing the tensile force applied from the center to the peripheral direction by the fixing member 40 to the edges of the first, second, and

third screen yarns

10, 20, and 30. It is understood that in other embodiments, the first, second and

third gauze

10, 20, 30 may also be a metal material having a certain ductility, such as stainless steel. The first gauze 10, the second gauze 20 and the third gauze 30 are made of elastic materials or metal materials with ductility, the fixing piece 40 is arranged to be connected with the edges of the first gauze 10, the second gauze 20 and the third gauze 30, the edges of the first gauze 10, the second gauze 20 and the third gauze 30 can be tightly pressed to be fixed, and the tightening degree of the screen cloth 00 can be adjusted by applying pulling force from the center to the periphery to the edges of the first gauze 10, the second gauze 20 and the third gauze 30, so that the aim of adjusting the testing precision of the differential pressure measuring device is fulfilled.

In one embodiment, referring to fig. 2 and 3, the fixing member 40 includes a first adjusting member 41 and a second adjusting member 42 opposite to each other, the first adjusting member 41 is disposed on a side of the first gauze 10 facing away from the second gauze 20, the second adjusting member 42 is disposed on a side of the third gauze 30 facing away from the second gauze 20, and the first adjusting member 41 and the second adjusting member 42 are connected and fixed. Specifically, the first and

second adjusters

41 and 42 may use a metal material for different properties, but are not limited to the metal material. In this embodiment, stainless steel is taken as an example, and the type of the stainless steel can be freely selected according to actual test or set use requirements. The first adjusting member 41 and the second adjusting member 42 are both of an annular structure surrounding the first gauze 10, the second gauze 20 and the third gauze 30, wherein at least part of the first adjusting member 41 is connected with the surface of the first gauze 10, at least part of the second adjusting member 42 is connected with the surface of the third gauze 30 at a position corresponding to the first adjusting member 41, and the purpose of fixing the gauzes is achieved by the pressure effect on the three layers of gauzes formed by the cooperation of the first adjusting member 41 and the second adjusting member 42. In addition, the first adjusting member 41 is directly connected to the second adjusting member 42, and applies pressure to the three layers of the screen yarns while applying pressure to the screen yarns, so that the first screen yarn 10, the second screen yarn 20 and the third screen yarn 30 are uniformly stressed to be in a tensioned state.

In one embodiment, referring to fig. 3, the first adjusting member 41 has a first pressing portion 411, the second adjusting member 42 has a second pressing portion 421, and the first pressing portion 411 and the second pressing portion 421 are correspondingly connected to tighten the screen 00. In this embodiment, the first pressing portion 411 is a protrusion, and the second pressing portion 421 is a groove. Specifically, the first pressing part 411 may be a protrusion in a V shape, a U shape, a rectangular shape, or any other shape, the shape of the groove of the second pressing part 421 is designed to correspond to the shape of the protrusion, the groove includes an opening and a bottom, the first pressing part 411 and the second pressing part 421 are arranged opposite to the face, and the protrusion enters the inside of the groove from the opening and abuts against the bottom of the groove. The height of the protrusion is the same as the depth of the groove, the first gauze 10, the second gauze 20 and the third gauze 30 are arranged between the first pressing part 411 and the second pressing part 421, when the protrusion is matched with the groove, the three layers of gauzes are tensioned and tightened, and the tightening degree is related to the sizes of the protrusion and the groove. When the width of the protrusion and the width of the groove are fixed, the depth of the protrusion entering the groove is about large, the larger the pulling force of the first pressing part 411 and the second pressing part 421 to the three layers of gauze is, the larger the tightness of the three layers of gauze is. When the height of the protrusion is equal to the depth of the groove, the wider the width of the protrusion and the groove, the greater the pulling force of the first pressing part 411 and the second pressing part 421 on the three layers of gauze, and the greater the tightness of the three layers of gauze. Therefore, the tightness degree of the gauze can be adjusted by changing the sizes of the bulges and the grooves. Through setting up first pressfitting portion 411 and second pressfitting portion 421 for protruding and recess matched with structure, can design the size of arch and recess according to actual demand, realize the purpose of adjusting the tightness degree of gauze.

In one embodiment, referring to fig. 4, the number of the first pressing portions 411 is plural, and the plural first pressing portions 411 are arranged at intervals on a straight line extending from the center to the periphery of the first gauze 10. Similarly, the number of the second pressing portions 421 is plural, the plural second pressing portions 421 are arranged at intervals on a straight line of the third gauze 30 extending from the center image to the periphery, and the plural first pressing portions 411 and the plural second pressing portions 421 are arranged in one-to-one correspondence. The sizes of the first stitching portions 411 and the second stitching portions 421 are designed correspondingly, and the first stitching portions 411 may be designed to have the same structure and size or different structures and sizes according to actual requirements. If the first pressing portion 411 is a V-shaped protrusion and the second pressing portion 411 is a rectangular protrusion on the same straight line from the center to the periphery. Alternatively, the size of the first nip 411 is larger than that of the second nip 411, and so on. When one of the first and second press-

fit portions

411 and 421 cannot satisfy the requirement of making the screen reach the actually required tightness, the tightness of the screen can be made larger by increasing the number of the first and second press-

fit portions

411 and 421. And through designing the structure of a plurality of first stitching parts 411 and second stitching parts 421, the pulling force of the first adjusting part 41 and the second adjusting part 42 on the gauze can be flexibly changed, so that the tightness degree of the gauze meets the requirement.

In one embodiment, referring to fig. 2 and 3, the first stitching portions 411 are connected end to end in the circumferential direction of the first gauze 10 to form a ring shape. Similarly, the second nip 421 is connected end to end in the axial direction of the third screen 30 to be annular. Through making first nip portion 411 and second nip portion 421 ring structure, when first nip portion 411 and second nip portion 421 cooperation, can make the whole periphery of first gauze 10, second gauze 20 and third gauze 30 receive even pulling force and extend to all around for the gauze surface degree of tightening is even, avoids because the degree of tightening of gauze all around leads to the inconsistent to the resistance of air current, influences pressure differential test device's test accuracy.

In one embodiment, referring to fig. 3, the first adjusting member 41 is provided with a first main body part 412, one end of the first main body part 412 is connected to the first pressing part 411, the other end extends to the edge of the first gauze 10, the second adjusting member 42 is provided with a second main body part 422, one end of the second main body part 422 is connected to the second pressing part 421, the other end extends to the edge of the first gauze 10, and the second main body part 422 is connected to the first main body part 412 to press and fix the first gauze 10, the second gauze 20 and the third gauze 30. Specifically, the first body portion 412 is attached to a surface of the first screen yarn 10 facing away from the second screen yarn 20, and the second body portion 422 is attached to a surface of the third screen yarn 30 facing away from the second screen yarn 20, and extends from the surface of the third screen yarn 30 to a surface of the first screen yarn 10 facing away from the second screen yarn 20. The end of the first main body part 412 facing away from the first pressing part 411 is provided with a first inclined surface, the end of the second main body part 422 facing away from the second pressing part 421 is provided with a second inclined surface, and the second inclined surface abuts against the first inclined surface by applying pressure to the second inclined surface, so that the first adjusting part 41 and the second adjusting part 42 are fixed. In addition, the pressing force between the first and

second body portions

412 and 422 also fixes the first, second, and

third screen yarns

10, 20, and 30.

In one embodiment, referring to fig. 2, 7 and 8, the first, second and

third screen yarns

10, 20 and 30 are all 1 or more in number. Specifically, the screen panel 00 may have a 3-layer or more screen structure, and the screen structure may be a combination of one or more numbers of the first, second, and

third screen yarns

10, 20, and 30. As shown in fig. 7, the screen 00 includes a combination of one layer of the first screen 10, two layers of the screen 20, and two layers of the third screen 30, and in this case, the screen 00 has a 5-layer screen structure. As shown in fig. 8, the screen panel 00 has a 5-layer screen structure including two layers of the first screen 10, one layer of the second screen 20, and two layers of the third screen 30. It is understood that in other embodiments, the screen 00 may also be any multi-layer screen structure including 4 layers, 6 layers and the like of the first screen 10, the second screen 20 and the third screen 30 provided in the embodiments of the present application, which is not limited herein. The screen cloth meets different tension requirements by the combined design of the number of the first gauze 10, the second gauze 20 and the third gauze 30, and the application range of the screen cloth 00 is expanded.

Referring to fig. 5, the differential pressure testing apparatus includes the screen 00 according to any of the embodiments. In this embodiment, the differential pressure test apparatus includes a differential pressure sampler 50 and a sensor 60, and the screen 00 is disposed in the differential pressure sampler 50. The sampler 50 includes an air inlet 51 and an air outlet 52, and the air flow flows into the differential pressure sampler 50 from the air inlet 51, is filtered by the gauze 50, and then flows out from the air outlet 52. The sensor 60 is respectively connected with the air inlet 51 and the air outlet 52 of the differential pressure sampler 50 through conduits, and collects the air pressure values at the air inlet 51 and the air outlet 52 of the differential pressure sampler 50 in real time.

In another embodiment, referring to fig. 3 and fig. 6, the differential pressure testing apparatus is a differential pressure sensor, the screen 00 is disposed inside the differential pressure sensor, the differential pressure sensor further includes a first sensing unit 71, a second sensing unit 72 and a controller 80, and both the first sensing unit 71 and the second sensing unit 72 are electrically connected to the controller 80. The first sensing unit 71 is disposed on a surface of the first gauze 10 facing away from the second gauze 20, and the second sensing unit 72 is disposed on a surface of the third gauze 30 facing away from the second gauze 20. When air flows, the first sensing unit 71 is used for sensing the pressure of the air flow on the first gauze 10, converting the sensing signal into a first electric signal and transmitting the first electric signal to the controller 80, the second sensing unit 72 is used for sensing the pressure of the air flow on the third gauze 30, converting the sensing signal into a second electric signal and transmitting the second electric signal to the controller 80, and the controller 80 can calculate the air flow pressure loss by comparing the difference value of the first electric signal and the second electric signal, so that relevant parameters are obtained.

It is understood that in other embodiments, the differential pressure testing device may be an air quality detector, a gas filter, a lung function tester, or any other gas detection device including the screen 00 according to the embodiments of the present application.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A screen, characterized in that it comprises a first mesh yarn, a second mesh yarn and a third mesh yarn that are stacked in sequence, the first mesh yarn, the second mesh yarn and the third mesh yarn The materials of the yarns are all ductile, and the second mesh yarn is provided with a first through hole in the middle, and the first mesh yarn and the third mesh yarn cover the first through hole.

2. The screen according to claim 1, characterized in that, the screen further comprises an annular fixing member, and the edges of the first mesh, the second mesh and the third mesh are The first mesh yarn, the second mesh yarn and the third mesh yarn are tightened by the fixing member and are in a taut state.

3. The screen according to claim 2, wherein the fixing member comprises an opposite first regulating member and a second regulating member, and the first regulating member is disposed on the opposite side of the first mesh yarn. One side of the second mesh yarn, the second adjustment member is arranged on the side of the third mesh yarn away from the second mesh yarn, and the first adjustment member and the second adjustment member are connected and fixed .

4 . The screen according to claim 3 , wherein the first regulating member is provided with a first pressing portion, the second regulating member is provided with a second pressing portion, and the first pressing The second pressing part is correspondingly connected to make the screen tight.

5 . The screen according to claim 4 , wherein the number of the first pressing parts is plural, and the plurality of the first pressing parts are located from the center to the periphery of the first mesh yarn. 6 . The extended straight line is spaced apart.

6 . The screen according to claim 4 , wherein the first pressing portion is connected end to end in the circumferential direction of the first mesh yarn and is annular. 7 .

7 . The screen of claim 4 , wherein the first pressing portion is a protrusion, and the second pressing portion is a groove. 8 .

8 . The screen according to claim 4 , wherein the first adjusting member is provided with a first main body part, one end of the first main body part is connected with the first pressing part, and the other end extends To the edge of the first mesh yarn, the second adjusting member is provided with a second main body part, one end of the second main body part is connected with the second pressing part, and the other end extends to the first mesh The edge of the yarn, the second main body part is connected with the first main body part, so as to compress and fix the first mesh yarn, the second mesh yarn and the third mesh yarn.

9 . The screen according to claim 1 , wherein the number of the first mesh yarn, the second mesh yarn and the third mesh yarn is one or more layers. 10 .

10 . A differential pressure testing device, characterized in that, the differential pressure testing device comprises the screen according to any one of claims 1 to 9 .