CN216593590U - Differential pressure type flow sampling assembly, differential pressure type flow sensor and pulmonary function instrument - Google Patents

Abstract

A differential pressure type flow sampling assembly, a differential pressure type flow sensor and a lung function instrument are provided, the differential pressure type flow sampling assembly comprises a sampler, a flow resisting part and a detecting part, the sampler encloses a chamber and comprises an air inlet and an air outlet, and air flow passes through the chamber through the air inlet and is discharged from the air outlet; the flow choking piece is arranged in the chamber and divides the chamber into a first chamber and a second chamber, the air inlet is communicated with the first chamber, the air outlet is communicated with the second chamber, and the airflow is subjected to air resistance when passing through the flow choking piece, so that the first chamber and the second chamber generate pressure difference; the sampler has still seted up first air current groove and second air current groove, and first air current groove and first cavity pass through first breach intercommunication, and second air current groove and second cavity pass through the second breach intercommunication, and the detection piece is used for detecting the atmospheric pressure of first air current groove and second air current groove, can realize the precision measurement and can carry out flow measurement to the gas of two-way flow.

Description

Differential pressure type flow sampling assembly, differential pressure type flow sensor and lung function instrument

Technical Field

The utility model belongs to the technical field of flow sensor, especially, relate to a differential pressure formula flow sampling subassembly, differential pressure formula flow sensor and pulmonary function appearance.

Background

The flow sensor can be classified into a positive displacement type, a turbine type, a differential pressure type, an electromagnetic type and the like according to the principle, wherein the differential pressure type flow sensor works according to the working principle that when airflow passes through a flow blocking piece arranged in a pipeline, the flow blocking piece provides certain air resistance for the airflow, so that a certain pressure difference value is generated at the front end and the rear end of the flow blocking piece, and the flow value can be obtained by measuring the pressure difference value.

In the related art, the differential pressure type flow sensor can only realize one-way detection generally, so that the convenience and the universality of applicability in the use process are reduced, and meanwhile, the flow of the airflow easily influences the measurement result of the airflow pressure, so that the accurate measurement cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a differential pressure formula flow sampling subassembly, differential pressure formula flow sensor and lung function appearance can realize the accurate measurement and can carry out the flow measurement to two-way mobile's gas.

For realizing the purpose of the utility model, the utility model provides a following technical scheme:

in a first aspect, the present invention provides a differential pressure type flow sampling assembly, which comprises a sampler, a flow blocking element and a detection element, wherein the sampler encloses a chamber, which comprises an air inlet and an air outlet, and an air flow passes through the chamber via the air inlet and is discharged from the air outlet; the flow blocking piece is arranged in the chamber and divides the chamber into a first chamber and a second chamber, the air inlet is communicated with the first chamber, the air outlet is communicated with the second chamber, and air resistance is applied to airflow when the airflow passes through the flow blocking piece, so that pressure difference is generated between the first chamber and the second chamber; the sampler is also provided with a first airflow groove and a second airflow groove, the first airflow groove is communicated with the first cavity through a first gap, the second airflow groove is communicated with the second cavity through a second gap, and the detection piece is used for detecting the air pressure of the first airflow groove and the air pressure of the second airflow groove.

In one embodiment, the sampler includes a first divider plate that separates the first gas flow channel from the first chamber and a second divider plate that separates the second gas flow channel from the second chamber, the first divider plate defining the first opening and the second divider plate defining the second opening.

In one embodiment, the sampler comprises a first sampler comprising a first housing enclosing the first chamber and a second sampler comprising a second housing enclosing the second chamber, the first housing and the second housing being connected and collectively enclosing the chamber; the first partition plate is annularly arranged on the first shell, and the second partition plate is annularly arranged on the second shell; the choke element is connected to the first sampler and/or the second sampler.

In one embodiment, the first gap is a plurality of gaps, and the plurality of first gaps are uniformly arranged on the first partition plate.

In one embodiment, the first casing is provided with a pressure producing hole, and the pressure producing hole is communicated with the first airflow groove.

In one embodiment, the first sampler still includes the installation department, the installation department sets up on the first casing, the holding tank has been seted up to the installation department, the holding tank with adopt the pressure hole intercommunication, the detection piece is used for detecting the atmospheric pressure of holding tank.

In one embodiment, the installation part further comprises an air guide pipe, the accommodating groove is communicated with the air guide pipe, and one end of the air guide pipe, which is opposite to the accommodating groove, is communicated with the pressure collecting hole.

In one embodiment, the bottom wall of the accommodating groove is connected with the air duct, and the air duct is eccentrically arranged relative to the bottom wall.

In a second aspect, the present invention further provides a differential pressure type flow sensor, the differential pressure type flow sensor comprises an adapter and any one of the embodiments of the first aspect, the differential pressure type flow sampling assembly, the adapter is connected to the sampler, the adapter is connected to the detecting member, and the gas in the first gas flow channel flows into the detecting member through the adapter.

In a third aspect, the present invention further provides a lung function instrument, wherein the lung function instrument comprises the differential pressure type flow sensor of the second aspect.

The sampler encloses the chamber, the flow resisting piece is arranged in the chamber, airflow enters the chamber through the air inlet, is subjected to resistance when flowing through the flow resisting piece and is discharged from the air outlet, so that pressure difference is generated on two sides of the flow resisting piece, the pressure difference of the chambers on two sides of the flow resisting piece is detected by the detection piece, and the flow of the airflow can be obtained through calculation; when the air current flows through the choker, because the cavity of choker both sides has certain space, there is the difference in the gas pressure everywhere in space, it is great consequently directly to detect the error to the atmospheric pressure in first cavity and the second cavity, through seting up first air current groove and second air current groove at the sample thief, make first air current groove pass through first breach and first cavity intercommunication, second air current groove passes through second breach and second cavity intercommunication, the measuring part detects the atmospheric pressure of first air current groove and second air current groove, the indirect detection that realizes first cavity and the second cavity atmospheric pressure to the choker both sides, be favorable to avoiding the air current to make the problem that the testing result has the error at the flow process unstability, realize more accurate measurement.

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 for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an overall block diagram of a differential pressure flow sampling assembly of an embodiment;

FIG. 2 is an exploded view of an embodiment of a differential pressure flow sampling assembly;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4a is a schematic diagram of a first sampler of an embodiment;

FIG. 4b is a schematic diagram of the first sampler of FIG. 4a at another view angle;

FIG. 5 is a bottom view of a differential pressure flow sampling assembly of an embodiment.

Description of reference numerals:

100-sampler, 200-flow-resisting element;

101-a first sampler, 102-a second sampler, 103-a chamber;

11-a first shell, 111-an air inlet, 112-a first airflow groove, 113-a first partition plate, 114-a first notch, 115-a pressure collecting hole, 116-an external buckling point, 12-an installation part, 121-an accommodating groove, 122-an air duct, 13-a first decoration piece;

21-a second shell, 211-an air outlet, 22-a second decorative piece;

31-first chamber, 32-second chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a differential pressure type flow sampling assembly, which can be applied to a handheld pulmonary function device, a ventilator, an oxygen generator, etc., wherein an air inlet 111 of the differential pressure type flow sampling assembly can be connected to a patient, and when the patient exhales or inhales, the flow of the gas exhaled by the patient or the flow of the inhaled gas can be monitored, and then whether the patient breathes normally or not, and whether related therapy is performed or not can be determined according to whether the flow is within a standard value conforming to a normal person.

Referring to fig. 1, 2 and 3, the differential pressure type flow sampling assembly includes a sampler 100, a flow blocking element 200 and a detecting element.

The sampler 100 encloses the chamber 103, and includes a gas inlet 111 and a gas outlet 211, the gas flow passes through the chamber 103 via the gas inlet 111 and is discharged from the gas outlet 211, the sampler 100 is made of a material including, but not limited to, plastic or metal, and the shape thereof includes, but not limited to, an ellipsoid, the gas inlet 111 and the gas outlet 211 are oppositely disposed on the sampler 100, so that the gas inlet 111, the chamber 103 and the gas outlet 211 form a gas flow path, where the gas inlet 111 and the gas outlet 211 are only inlet and outlet channels of gas in a broad sense, and the sampler 100 can be used bidirectionally.

Optionally, the main body of the sampler 100 is ellipsoidal, and two pipes extend from two sides of the main body of the sampler 100 along a central axis of the ellipsoidal short axis, the two pipes are smoothly connected to the main body of the sampler 100 and respectively serve as an air inlet channel and an air outlet channel for air flow, the air inlet channel and the air outlet channel penetrate through the chamber 103 and are communicated with the chamber 103, and the pipe openings of the two pipes are respectively an air inlet 111 and an air outlet 211. The outward extension of the air inlet 111 and the air outlet 211 facilitates the patient to breathe into or out of the sampler 100; the design that the passages at the two ends are small and the middle cavity 103 is large is beneficial to full contact of airflow and the flow blocking piece 200 arranged in the cavity 103, and the flow blocking effect of the flow blocking piece 200 is enhanced.

The flow blocking element 200 is disposed in the chamber 103, and the material of the flow blocking element 200 includes, but is not limited to, metal and polymer material, and preferably polymer material. The high polymer material is light and convenient and has strong water resistance, thereby being beneficial to preventing the choked flow piece 200 from being corroded by the temperature and humidity gas which is contacted and inhaled for a long time; the heat conductivity of the high polymer material is weaker than that of metal, and the problem that more water drops are generated at the position of the flow resisting piece 200 due to the larger temperature difference between the flow resisting piece 200 and the incoming gas, so that the detection result is influenced or the loss of the flow resisting piece 200 is caused can be solved.

The flow blocking part 200 is a sheet structure as a whole, and includes a fixing part and a screen, the fixing part has the same shape as the edge of the sampler 100 at the fixing part, and the screen can provide a certain air resistance for the air flow passing through the flow blocking part 200, so that the air pressure difference is generated at both sides of the flow blocking part 200. The choke piece 200 is generally disposed in the middle of the chamber 103, and divides the chamber 103 into two first and second chambers 31 and 32 having the same volume, the air inlet 111 is communicated with the first chamber 31, the air outlet 211 is communicated with the second chamber 32, the air flow is blocked when passing through the choke piece 200, so that a pressure difference is generated between the first and second chambers 31 and 32, the air pressure of the first and second chambers 31 and 32 is detected by a pressure sensor, and the flow rate of the air flow can be calculated by the pressure difference.

However, the first chamber 31 and the second chamber 32 both have a certain space, and the air pressure in the chamber 103 is different during the flowing of the air flow, and the flow rate of the air flow is unstable during the process of the patient exhaling or inhaling the air, so that the error in directly detecting the air pressure in the first chamber 31 and the second chamber 32 is large. Therefore, by providing the first airflow slot 112 and the second airflow slot in the sampler 100, the first airflow slot 112 and the first chamber 31 are communicated through the first gap 114, and the second airflow slot and the second chamber 32 are communicated through the second gap, and by using the detection member to detect the air pressure in the first airflow slot 112 and the second airflow slot, the influence of the airflow fluctuation on the detection result can be reduced.

The sampler 100 is used for enclosing the chamber 103, the flow blocking piece 200 is arranged in the chamber 103, airflow enters the chamber 103 through the air inlet 111, is subjected to resistance when flowing through the flow blocking piece 200 and is discharged from the air outlet 211, so that pressure difference is generated on two sides of the flow blocking piece 200, the pressure difference of the chambers 103 on two sides of the flow blocking piece 200 is detected by the detection piece, and the flow of the airflow can be obtained through calculation.

When the airflow passes through the flow resisting part 200, because the chambers 103 on both sides of the flow resisting part 200 have certain spaces, and the gas pressures in the spaces are different, the sampler 100 is provided with the first airflow groove 112 and the second airflow groove, so that the first airflow groove 112 is communicated with the first chamber 31 through the first notch 114, and the second airflow groove is communicated with the second chamber 32 through the second notch, and therefore, the gas pressure in the first airflow groove 112 is the same as that in the first chamber 31, and the gas pressure in the second airflow groove is the same as that in the second chamber 32. The detection piece is adopted to detect the air pressure of the first airflow groove 112 and the air pressure of the second airflow groove, so that the air pressure of the first cavity 31 and the air pressure of the second cavity 32 on two sides of the flow blocking piece 200 are indirectly detected, errors caused by different detection points of the detection piece in the first cavity 31 and the second cavity 32 are avoided, the problem that the detection result is influenced by the instability of the airflow in the flowing process is solved, and more accurate measurement is realized.

In one embodiment, referring to fig. 3 and 4a, the sampler 100 includes a first partition plate 113 and a second partition plate, the first partition plate 113 separates the first airflow slot 112 and the first chamber 31, the second partition plate separates the second airflow slot and the second chamber 32, the first partition plate 113 has a first notch 114, and the second partition plate has a second notch.

Optionally, the opening directions of the first airflow slot 112 and the second airflow slot are perpendicular to the airflow direction, and are opened on the sampler 100 near two sides of the flow resisting piece 200, the first partition plate 113 and the second partition plate respectively close the openings of the first airflow slot 112 and the second airflow slot, and the first airflow slot 112 and the first chamber 31 are communicated with each other, and the second airflow slot and the second chamber 32 are communicated with each other through the first notch 114 and the second notch.

Optionally, the opening directions of the first airflow slot 112 and the second airflow slot are the same as the airflow direction, the first partition plate 113 and the second partition plate are respectively disposed on the sampler 100 near both sides of the flow resisting piece 200, the first partition plate 113 and the sampler 100 enclose the first airflow slot 112, the second partition plate and the sampler 100 enclose the second airflow slot, the fixing piece of the flow resisting piece 200 seals the openings of the first airflow slot 112 and the second airflow slot, so that the first airflow slot 112 is communicated with the first chamber 31 through the first notch 114, the second airflow slot is communicated with the second chamber 32 through the second notch, and the first airflow slot 112 and the second airflow slot are independent from each other.

Through setting up first division board 113 and second division board, make first division board 113 separate first air current groove 112 and first cavity 31, second division board separates second air current groove and second cavity 32, and the sample thief 100 structure under the design like this is simpler, the industrial production of also being convenient for, and simultaneously, the equipment between each part of differential pressure formula flow sampling subassembly is simpler. When the opening directions of the first airflow groove 112 and the second airflow groove are the same as the airflow direction, the first airflow groove 112 can be formed by the first partition plate 113 and the sampler 100 in a surrounding manner, so that the arrangement mode of the first airflow groove 112 is simpler, the size, the number and the position of the first airflow groove 112 can be adjusted by adjusting the position of the first partition plate 113, the airflow of the first chamber 31 can enter the first airflow groove 112 more uniformly, the air pressure in the first airflow groove 112 can more accurately correspond to the air pressure of the first chamber 31, and the detection result of the detection piece is more accurate; the second airflow slot is identical to the first airflow slot 112.

In one embodiment, referring to fig. 2 and 3, the sampler 100 includes a first sampler 101 and a second sampler 102, the first sampler 101 includes a first housing 11, the first housing 11 encloses a first chamber 31, the second sampler 102 includes a second housing 21, the second housing 21 encloses a second chamber 32, the first housing 11 and the second housing 21 have the same shape and are symmetrically connected to enclose a chamber 103. The choke 200 is arranged between the first housing 11 and the second housing 21 and is connected to the first housing 11 or the second housing 21 by a fixing element, or the choke 200 is connected to both the first housing 11 and the second housing 21 after the assembly is completed.

Wherein, the first partition plate 113 is annularly disposed on the first housing 11, and the first partition plate 113 and the first housing 11 enclose the annular first airflow slot 112; the second partition plate is annularly disposed in the second casing 21, and the second partition plate and the second casing 21 enclose an annular second airflow slot.

Alternatively, the first housing 11 is provided with an annular first partition 113 and an annular fixing member for fixing the choke 200. Therefore, the first housing 11 is provided with more annular structures, which results in uneven thickness of the housing, increasing difficulty in manufacturing the housing in industrial production, and the housing is more easily damaged due to uneven thickness. Therefore, the annular protrusion corresponding to the annular structure such as the first partition plate 113 is disposed on the outer side of the first casing 11, so that the thickness of the first casing 11 is uniform, which is beneficial to reducing the difficulty of industrial manufacture and improving the mechanical strength. Meanwhile, the first decorating part 13 is arranged and used for covering the bulge on the outer side of the first shell 11, so that the product is more attractive; the second housing 21 is the same as the first housing 11, and a second garnish 22 is provided to cover the projection.

Optionally, near the joint between the first casing 11 and the second casing 21, the first casing 11 is further provided with a plurality of external fastening points 116, and the external fastening points 116 are uniformly distributed near the joint; the second housing 21 has the same exterior snap points 116 as the first housing 11. The first sampler 101 and the second sampler 102 are fixed through a first circular buckle and a second circular buckle, the first circular buckle and the second circular buckle wrap the joint of the first shell 11 and the second shell 21 after being assembled, and are fixed with the first shell 11 and the second shell 21 through the external buckling point 116, so that the first sampler 101 and the second sampler 102 are further fixed, and the air tightness of the whole sampler 100 is improved.

By splitting the sampler 100 into the first sampler 101 and the second sampler 102, the assembly of the flow resisting piece 200 and the sampler 100 is more convenient, and the interior of the sampler 100 is also convenient to clean; by arranging the first partition plate 113 annularly on the first housing 11, the first airflow slot 112 is also annularly arranged on the first housing 11, which is beneficial for the airflow of the first chamber 31 to enter the first airflow slot 112 more uniformly, and the air pressure in the first airflow slot 112 more accurately corresponds to the air pressure of the first chamber 31, so that the detection result of the detection piece is more accurate; the second airflow slot is identical to the first airflow slot 112.

In one embodiment, referring to fig. 2, 4a and 4b, the first notches 114 are multiple, and the first notches 114 are uniformly disposed on the first separating plate 113. Optionally, four first notches 114 are uniformly formed in the annular first partition 113 to substantially balance the air pressures in the first chamber 31 and the first air flow groove 112; optionally, when the sampler 100 is in normal use, the first partition plate 113 has a lowest position, and the first notch 114 is disposed at a position having a certain distance from the lowest position, so that the first partition plate 113 can provide a storage position for the liquid generated in the sampler 100; the second notch is identical to the first notch 114.

The first separating plate 113 is annularly arranged on the first shell 11, the first airflow slot 112 is also annularly arranged on the first shell 11, the first separating plate 113 is uniformly provided with the plurality of first notches 114, all parts of the first chamber 31 are communicated with the first airflow slot 112, the airflow of the first chamber 31 can more uniformly enter the first airflow slot 112, the air pressure in the first airflow slot 112 can more accurately correspond to the air pressure of the first chamber 31, the detection result of the detection piece is more accurate, and meanwhile, the problem that the air pressure in the first airflow slot 112 cannot be timely balanced with the air pressure in the first chamber 31 due to less or uneven opening positions of the first notches 114 is avoided; by arranging the first notch 114 at a higher position, a temporary storage position can be provided for the liquid generated in the sampler 100, so that the liquid can be conveniently removed, the liquid can be prevented from flowing into the pressure sensor to cause damage, and the accuracy of the detection result can be improved; the second notch is identical to the first notch 114.

In one embodiment, referring to fig. 4a and 4b, the first casing 11 is provided with a pressure collecting hole 115, and the pressure collecting hole 115 is communicated with the first airflow groove 112. Specifically, the pressure collecting hole 115 is opened in the first casing 11 that encloses the first airflow slot 112 together with the first partition plate 113, and the pressure collecting hole 115 is single and penetrates through the first casing 11; the second casing 21 is provided with the same production ports 115 as the first casing 11.

Optionally, a sampling column is used in conjunction with the sampler 100, the gas line of the sampling column is connected to the sampling hole, and the gas in the first gas flow channel 112 flows through the sampling hole to the gas line of the sampling column, so that the gas pressure in the gas line is equal to that in the first gas flow channel 112. The detection of the air pressure of the first air flow groove 112, namely the first chamber 31, is realized by detecting the air pressure in the air pipeline of the sampling column, and the detection mode can avoid errors caused by the problem of tightness between the detection piece and the sampler 100 in the detection process.

Through setting up the pressure hole 115, it is more convenient to make the detection of atmospheric pressure in the first airflow groove 112, has avoided directly using the atmospheric pressure that detects in the piece to the first airflow groove 112 to detect, leads to first airflow groove 112 and detects a junction leakproofness relatively poor, makes the problem that the testing result has great error.

In one embodiment, referring to fig. 1, 2 and 3, the first sampler 101 further includes a mounting portion 12, the mounting portion 12 is disposed outside the first housing 11 and near the flow resisting element 200, and the second sampler 102 has the same mounting portion 12 as the first sampler 101; the shape of the mounting portion 12 includes, but is not limited to, a semi-cylindrical shape, and when the first sampler 101 and the second sampler 102 are assembled, the mounting portion 12 of the first sampler 101 and the mounting portion 12 of the second sampler 102 are combined to form a complete cylindrical shape. Meanwhile, the mounting portion 12 can also be used as a part of a hand-held handle during the testing process of the patient, so that the sampler 100 can be conveniently fixed.

Wherein, the holding tank 121 has been seted up to installation department 12, and holding tank 121 communicates with adopt the pressure hole 115, and the detection piece is used for detecting the atmospheric pressure of holding tank 121. Optionally, the accommodating groove 121 is used for accommodating a sampling column matched with the sampler 100, a sealing ring is arranged on the periphery of the sampling column close to the sampling hole, and the sealing ring is used for sealing the accommodating groove 121, so that the space between the sealing ring and the pressure sampling hole 115 is completely sealed, and the situation that the detection result is affected due to insufficient connection between the pressure sampling hole 115 and the sampling column is avoided; the mounting portion 12 of the second sampler 102 is the same as the mounting portion 12 of the first sampler 101.

Through setting up installation department 12, set up holding tank 121 in installation department 12, this holding tank 121 is used for placing the sampling post supporting with sample thief 100, sample through the atmospheric pressure of sampling post in to first airflow groove 112, it is more convenient to make the detection of atmospheric pressure in the first airflow groove 112, avoided directly using the atmospheric pressure of detection piece in to first airflow groove 112 to detect, lead to first airflow groove 112 and detection piece junction leakproofness relatively poor, make the testing result have the problem of great error.

In one embodiment, referring to fig. 3, the mounting portion 12 further includes an air duct 122, the receiving cavity 121 is communicated with the air duct 122, one end of the air duct 122 opposite to the receiving cavity 121 is communicated with the pressure sampling hole 115, and the air ducts 122 of the mounting portions 12 of the first sampler 101 and the second sampler 102 are the same.

Specifically, after the gas guide tube 122 is arranged, in the first sampler 101, gas in the first chamber 31 enters the first gas flow groove 112 from the first notch 114, the gas in the first gas flow groove 112 reaches the gas guide tube 122 through the pressure collecting hole 115, and then enters the accommodating groove 121 through the gas guide tube 122, a sampling column is arranged in the accommodating groove 121, the sampling column comprises a gas flow pipeline, and the detection piece detects gas pressure in the gas flow pipeline of the sampling column to realize measurement of the gas pressure in the first chamber 31; the second sampler 102 is identical to the first sampler 101.

Through setting up air duct 122, make adopt pressure hole 115 to be connected with air duct 122 earlier, rethread air duct 122 and holding tank 121 intercommunication, this kind of connected mode is compared in directly adopting adopts pressure hole 115 intercommunication holding tank 121 and first air current groove 112, is favorable to improving the leakproofness of first air current groove 112 and holding tank 121 junction, prevents that first air current groove 112 and second air current groove from mixing, makes the testing result of detection piece more accurate.

In one embodiment, referring to fig. 3 and 5, the bottom wall of the accommodating cavity 121 is connected to the air duct 122, and the air duct 122 is eccentrically disposed relative to the bottom wall. The receiving groove 121 is used for receiving a sampling column that is associated with the sampler 100, the sampling column comprising an airflow channel that comprises an airflow inlet. The gas inlet is located at the center of the sampling column and does not correspond to the gas guide tube 122, so that after the gas enters the accommodating groove 121 from the gas guide tube 122, the flow direction of the gas is not directly opposite to the gas inlet, but slightly staggered from the gas inlet.

Through making the gas flow direction not corresponding to the air current entry, be favorable to avoiding the liquid in the air duct 122 directly to get into the air current pipeline of sampling post, and then damage precision devices such as the pressure sensor who is connected with the sampling post, cause comparatively serious loss. After the sampler 100 is used for a plurality of times, a small amount of liquid may be accumulated in the first air flow groove 112, and there is a possibility that the liquid flows into the accommodating groove 121 along the air duct 122 with the air flow. The sampling column is provided with a sealing ring near the airflow inlet, so that the air duct 122 and the airflow inlet are arranged in a staggered manner, liquid flowing into the accommodating groove 121 can be accumulated in the accommodating groove 121 near the sealing ring instead of entering the airflow channel together with air, thereby being beneficial to protecting other precise devices connected with the sampling column, prolonging the service life of the instrument and simultaneously ensuring that the detection result is more accurate.

The embodiment of the utility model provides a differential pressure formula flow sensor is still provided, including adapter and as any embodiment of the first aspect differential pressure formula flow sampling subassembly, the adapter is connected with sample thief 100, the adapter is connected with the detection piece, the gas of first airflow groove 112 flows in the detection piece through the adapter. The adapter is made of plastic or metal, comprises two sampling columns which are respectively a first sampling column and a second sampling column, the first sampling column is communicated with the cavity 103 near one side of the flow blocking piece 200, the second sampling column is communicated with the cavity 103 near the other side of the flow blocking piece 200, and inner cavities of the two sampling columns are communicated to the pressure sensor to obtain a pressure value.

Optionally, the adaptor further includes a slot for the rotation self-locking device to move, the slot is matched with the mounting portion 12 on the sampler 100 and is used for connecting the first sampler 101, the flow resisting piece 200, the second sampler 102 and the adaptor, and meanwhile, a certain compression effect can be provided for the first sampler 101, the flow resisting piece 200 and the second sampler 102, and all the fixed parts are integrated.

Through adopting the utility model provides a differential pressure formula flow sampling subassembly for this differential pressure formula flow sensor simple structure, application scope are wide and the precision is high, can also realize gas flow's both-way detection simultaneously, and detachable design has also made things convenient for the disinfection work alone of each part, can provide safety, effectual flow detection function in the special period.

The embodiment of the utility model provides a lung function appearance is still provided, lung function appearance includes as the second aspect differential pressure formula flow sensor. Through adopting this differential pressure formula flow sensor for pulmonary function appearance simple structure, application scope are wide and the precision is high, can also realize gas flow's two-way detection simultaneously, and detachable design has also made things convenient for the disinfection work alone of each part, can provide safety, effectual flow detection function in special period.

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 details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. A differential pressure type flow sampling component is characterized in that the differential pressure type flow sampling component comprises a sampler, a flow choking part and a detection part,

the sampler encloses a chamber and comprises an air inlet and an air outlet, and air flow passes through the chamber through the air inlet and is discharged from the air outlet;

the flow blocking piece is arranged in the chamber and divides the chamber into a first chamber and a second chamber, the air inlet is communicated with the first chamber, the air outlet is communicated with the second chamber, and air resistance is applied to airflow when the airflow passes through the flow blocking piece, so that pressure difference is generated between the first chamber and the second chamber;

the sampler is also provided with a first airflow groove and a second airflow groove, the first airflow groove is communicated with the first cavity through a first gap, the second airflow groove is communicated with the second cavity through a second gap, and the detection piece is used for detecting the air pressure of the first airflow groove and the air pressure of the second airflow groove.

2. The differential pressure flow sampling assembly of claim 1, wherein the sampler comprises a first divider plate and a second divider plate, the first divider plate separating the first airflow channel and the first chamber, the second divider plate separating the second airflow channel and the second chamber, the first divider plate defining the first aperture, the second divider plate defining the second aperture.

3. The differential flow sampling assembly of claim 2, wherein the sampler comprises a first sampler comprising a first housing enclosing the first chamber and a second sampler comprising a second housing enclosing the second chamber, the first housing and the second housing being coupled and cooperating to enclose the chamber; the first partition plate is annularly arranged on the first shell, and the second partition plate is annularly arranged on the second shell; the choke element is connected to the first sampler and/or the second sampler.

4. The differential flow sampling assembly according to claim 3, wherein the first notch is a plurality of notches, and the plurality of first notches are uniformly disposed on the first dividing plate.

5. The differential pressure flow sampling assembly of claim 3, wherein the first housing defines a pressure pick-up orifice in communication with the first airflow channel.

6. The differential pressure type flow sampling assembly according to claim 5, wherein the first sampler further comprises an installation part, the installation part is disposed on the first housing, the installation part is provided with a receiving groove, the receiving groove is communicated with the sampling hole, and the detecting member is used for detecting air pressure of the receiving groove.

7. The differential pressure flow sampling assembly according to claim 6, wherein the mounting portion further comprises an air duct, the receiving groove is communicated with the air duct, and one end of the air duct opposite to the receiving groove is communicated with the pressure sampling hole.

8. The differential pressure flow sampling assembly according to claim 7, wherein a bottom wall of the receiving groove is coupled to the airway tube, and the airway tube is eccentrically positioned relative to the bottom wall.

9. A differential pressure flow sensor comprising an adapter and the differential pressure flow sampling assembly of any one of claims 1 to 8, the adapter being connected to the sampler, the adapter being connected to the sensing element, the gas in the first gas flow channel flowing through the adapter into the sensing element.

10. A lung function device comprising the differential pressure flow sensor of claim 9.

Images