CN114112554A - Air bag device capable of automatically collecting ambient background air and preparation method and use method thereof - Google Patents
Air bag device capable of automatically collecting ambient background air and preparation method and use method thereof Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
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Abstract
The invention discloses an air bag device for automatically collecting environmental background gas, a preparation method and a use method thereof, wherein the air bag device comprises a detection gas chamber and an environmental gas chamber which are formed by enclosing a film; the environment gas chamber is arranged in the detection gas chamber, and the outer film wall of the environment gas chamber is fixedly connected with the inner film wall of the detection gas chamber along a preset heat sealing line; when the gas to be detected enters the detection gas cavity through the first valve, the detection gas cavity is inflated to expand, so that the environment gas cavity is driven to expand and generate negative pressure, and the environment gas enters the environment gas cavity through the second valve. The invention realizes that the gas to be tested and the environmental background gas are collected at the same place and at the same time, and ensures the precision of gas detection in the industrial production and medical fields. The automatic collection of the environmental background gas can be realized while the gas to be tested is collected, the complexity of sample collection is avoided, and the test cost and time are greatly saved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of gas detection, in particular to an air bag device for automatically collecting environmental background gas, and a preparation method and a use method thereof.
[ background of the invention ]
Gas detection in the industrial and medical fields can be divided into direct sample detection and indirect sample detection. At present, large-scale equipment in gas detection is inconvenient to move, and real-time detection cannot be achieved frequently when problems such as large-scale general investigation of human exhaled breath in the medical industry and the like are solved, so that a gas transfer and collection device is needed, and gas to be tested in the industrial production and medical field is collected and transferred to corresponding test equipment for detection. The gas to be tested usually needs to consider the background gas of the environment where the gas is located for comparison research while being detected, and therefore the testing accuracy is guaranteed.
However, currently, there is a time difference between the collection of the ambient background gas and the collection of the gas to be detected, which affects the accuracy of the gas detection. Meanwhile, an extra device is needed for collecting samples of environmental background gas at present, so that the operation is complicated, and the cost and the time cost of the test are high.
Accordingly, there is a need for an airbag device that automatically collects ambient background gas, and a method of making and using the same to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide an air bag device for automatically collecting environmental background gas, and a preparation method and a use method thereof, and aims to solve the problem that the collection of samples of the environmental background gas is complicated during gas detection and improve the accuracy of the gas detection.
In order to achieve the above object, a first aspect of the present invention provides an air bag device for automatically collecting ambient background gas, comprising a detection gas chamber and an ambient gas chamber, both of which are defined by a film; the environment gas chamber is arranged in the detection gas chamber, and the outer film wall of the environment gas chamber is fixedly connected with the inner film wall of the detection gas chamber along a preset heat sealing line; the detection gas chamber is provided with a first valve, and the first valve penetrates through a film of the detection gas chamber to enable the detection gas chamber to be communicated with the outside; the environment gas chamber is provided with a second valve, and the second valve simultaneously penetrates through the film of the detection gas chamber and the film of the environment gas chamber to enable the environment gas chamber to be communicated with the outside; when gas to be detected enters the detection gas cavity through the first valve, the detection gas cavity is inflated to expand, so that the environment gas cavity is driven to expand and generate negative pressure, and then the environment gas enters the environment gas cavity through the second valve.
In a preferred embodiment, a support strip is disposed within the detection gas chamber; one end of the supporting strip is connected with the inner wall of the detection gas chamber, and the other end of the supporting strip is connected with the outer wall of the environment gas chamber.
In a preferred embodiment, the material of the film and the support strip is one or more of PEEK, PVF, PVDF, PTFE, FEP, and PFA; the thickness of the film is 0.02mm-0.2mm, and the gas inlet pressure of the detection gas cavity is within 10 Kpa.
In a second aspect, the present invention provides a method for preparing an air bag device for automatically collecting ambient background gas, which is used for preparing the air bag device for automatically collecting ambient background gas according to any one of the above embodiments, and comprises the following steps:
taking a cylindrical air bag made of a thin film material and provided with openings at the upper end and the lower end and a triangular support strip;
placing the support strip into the cylindrical air bag and flattening the cylindrical air bag, wherein one side of the support strip is flush with one end of the cylindrical air bag, and then, one end of the cylindrical air bag and one side of the support strip are subjected to heat sealing together; wherein, the end of the cylindrical air bag which is defined by heat sealing is a first sealed edge, and the end of the cylindrical air bag which is far away from the first sealed edge is a second sealed edge;
folding the first seal edge inward into the cylindrical air bag, wherein a third seal edge is formed at one end of the cylindrical air bag away from the second seal edge;
performing heat sealing on the two layers of films between the first sealing edge and the third sealing edge along a preset heat sealing line;
flattening the cylindrical air bag and performing heat sealing on the third sealing edge, wherein an environment air chamber is formed by the first sealing edge and the third sealing edge together;
flattening the second seal edge and enabling one end, far away from the first seal edge, of the support strip to be arranged in the second seal edge, then performing heat sealing on the second seal edge, and at the moment, forming a detection gas chamber by the second seal edge and the third seal edge in a surrounding mode;
passing a first valve through a membrane of the detection gas chamber and fastening by threads; a second valve is simultaneously passed through the membranes of the ambient and the test gas chambers and tightened by a nut washer.
In a preferred embodiment, prior to heat sealing the first hem seal, the method further comprises the steps of:
and flattening the cylindrical air bag, and cutting two sides of one end of the first sealing edge formed by heat sealing to ensure that the first sealing edge is enclosed to be trapezoidal.
In a preferred embodiment, a PEEK film is used, the heat sealing temperature is 320 ℃, the heating time is 3s, and the press forming holding time is 8 s; the width of the first sealing edge, the second sealing edge and the third sealing edge is 5 mm.
A third aspect of the invention provides a system for automatically collecting ambient background gas, comprising an air bag device for automatically collecting ambient background gas and an air source outlet device or a flow guide pipe according to any one of the above embodiments; the gas source outlet device is used for pumping gas to be detected into the gas detection chamber through the first valve; the guide pipe comprises a guide pipe and a blowing nozzle which are communicated; the blowing nozzle is connected with the first valve in a sealing mode and used for guiding the expired air of the user into the detection gas chamber through the guide pipe.
The invention provides a method for automatically collecting environmental background gas, which is used for inputting target gas for detection and comprises the following steps:
connecting the gas source outlet device with a first valve in a sealing way, and opening the first valve and a second valve;
slowly blowing or pumping gas to be detected into a detection gas chamber through a gas source outlet device until the detection gas chamber is filled with the gas to be detected;
and closing the first valve and the second valve in sequence.
In a fifth aspect of the present invention, a method for automatically collecting ambient background air for medical breath detection comprises the following steps:
connecting a guide pipe of the flow guide pipe with a first valve in a sealing manner, and opening the first valve and a second valve;
a person to be tested blows air through a blowing nozzle, and exhales air into a detection gas chamber until the detection gas chamber is full of the exhales air;
and closing the first valve and the second valve in sequence.
In a preferred embodiment, the method further comprises the following steps:
performing blowing-emptying bag washing operation on the detection gas chamber and the environmental gas chamber for preset times through a blowing device; wherein, the blowing air is standard air after being filtered.
The air bag device for automatically collecting the environmental background gas and the use method thereof provided by the invention have the advantages that the environmental gas cavity is arranged in the detection gas cavity to form a 'primary-secondary bag' structure, when the gas to be detected enters the detection gas cavity, the detection gas cavity is inflated and expanded, and the outer wall of the film of the environmental gas cavity is fixedly connected with the inner wall of the film of the detection gas cavity along the preset heat sealing line, so that the environmental gas cavity is also expanded and generated to generate negative pressure, the environmental background gas can enter the environmental gas cavity, the gas to be detected and the environmental background gas are collected at the same place at the same time, and the gas detection accuracy in the industrial production and medical field is ensured. Meanwhile, the automatic collection of the environmental background gas can be realized while the gas to be tested is collected, the complexity of sample collection is avoided, and the test cost and time are greatly saved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of an airbag device for automatically collecting ambient background gas according to the present invention;
FIG. 2 is a schematic flow chart of a method for manufacturing an air bag device for automatically collecting ambient background air according to the present invention;
FIG. 3 is a schematic view of the structure of a draft tube;
FIG. 4 is a flow chart of one embodiment of a method for using an airbag device for automatically collecting ambient background gas in accordance with the present invention;
FIG. 5 is a flow chart of another embodiment of a method for using an airbag device for automatically collecting ambient background gas according to the present invention.
Reference numbers in the figures: 100. an air bag device for automatically collecting ambient background air; 101. an inner air bag film; 102. an outer air bag film; 200. a flow guide pipe; 201. a conduit; 202. a blowing nozzle; 10. a detection gas chamber; 20. an ambient air chamber; 30. heat sealing the wire; 40. a first valve; 50. a second valve; 60. a support strip; 70. a cylindrical air bag; 71. first edge sealing; 72. second edge sealing; 73. and (7) sealing the edges.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In an embodiment of the present invention, a first aspect provides an air bag device 100 for automatically collecting ambient background gas, which is used for realizing that the gas to be tested and the ambient background gas are collected at the same place and the same time.
Example one
As shown in fig. 1, the air bag apparatus 100 for automatically collecting ambient background air comprises a detection gas chamber 10 and an ambient gas chamber 20, which are surrounded by films.
The ambient air chamber 20 is disposed inside the detection air chamber 10, and the outer film wall of the ambient air chamber 20 is fixedly connected to the inner film wall of the detection air chamber 10 along a predetermined heat sealing line 30. I.e. the two films of the ambient gas chamber 20 and the sensing gas chamber 10 have a welded connection along the heat seal line 30. The heat seal line 30 may be in the form of a loop, a fold line, or discrete adhesive dots or segments such that when the film of the detection gas chamber 10 is inflated, the film of the ambient gas chamber 20 is pulled by the heat seal line 30 to inflate in multiple directions, thereby creating a negative pressure and drawing in ambient background gas.
The detection gas chamber 10 is provided with a first valve 40, and the first valve 40 penetrates through the membrane of the detection gas chamber 10 to enable the detection gas chamber 10 to be communicated with the outside. The ambient air chamber 20 is provided with a second valve 50, and the second valve 50 simultaneously penetrates through the membrane of the detection air chamber 10 and the membrane of the ambient air chamber 20 to communicate the ambient air chamber 20 with the outside. Specifically, when the gas to be detected enters the detection gas chamber 10 through the first valve 40, the detection gas chamber 10 inflates and expands, so that the environmental gas chamber 20 is driven to expand and generate negative pressure, the environmental gas enters the environmental gas chamber 20 through the second valve 50, and the gas to be detected and the environmental gas are collected at the same place and at the same time.
Further, in one embodiment, a support strip 60 is provided within the detection gas chamber 10. The shape and width of the support strip 60 can be adjusted as required to enhance the connection strength between the inner wall of the detection gas chamber 10 and the ambient gas chamber 20, so as to better maintain the bulging effect of the ambient gas chamber 20. In this embodiment, the support strip 60 is triangular. Specifically, one end (e.g., a vertex) of the support strip 60 is connected to the inner wall of the detection gas chamber 10, and the other end (e.g., a side corresponding to the vertex) of the support strip 60 is connected to the outer wall of the ambient gas chamber 20.
Specifically, when the air bag device 100 for automatically collecting ambient background air is in an idle state, the entire structure is in a flattened state. The corresponding part of the ambient air chamber 20 (i.e. the trapezoid dashed-line frame area in fig. 1) is made of four air bag films, the ambient air chamber 20 is formed by heat-sealing the inner two air bag films 101, and the detection air chamber 10 is formed by heat-sealing the outer two air bag films 102. Wherein one end of the support strip 60 is heat sealed between the inner two air bag films 101 and the other end is heat sealed between the outer two air bag films 102, thereby pulling the ambient air chamber 20 to ensure its good inflation. The first valve 40 is secured to the single layer outer film 102 by nut washers (not shown) and the second valve 50 is secured to the inner and outer layers of airbag films (101,102) by nut washers (not shown).
The film and the support strip 60 are made of one or more of PEEK (polyether ether ketone), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), PTFE (tetrafluoroethylene), FEP (fluorinated ethylene propylene) and PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether), and have low volatility, so that the subsequent gas detection effect is prevented from being influenced by material volatilization. In order to ensure good welding effect, the thickness of the film is 0.02mm-0.2 mm. In order to ensure the edge sealing strength of the heat sealing, the width range of the edge sealing during the heat sealing is controlled to be 3mm-8 mm. The inlet pressure of the gas chamber 10 is detected to be within 10Kpa, and the inlet pressure of the air bag or the pressure of the pumping gas is controlled to be within 10 Kpa. It should be noted that the air bags with different volumes can be freely designed based on the requirement of the test gas volume.
Example two
In a second aspect, the present invention provides a method for manufacturing an air bag device for automatically collecting ambient background gas, which is used for manufacturing the air bag device 100 for automatically collecting ambient background gas according to any one of the above embodiments.
As shown in fig. 2, the preparation method includes the following steps:
(1) a cylindrical air bag 70 of a film material having both upper and lower ends opened and a triangular support strip 60 are taken. As shown in fig. 2a, the cylindrical air bag 70 is flattened in a rectangular shape in which two layers are stacked.
Further, the cylindrical air bag 70 is flattened and cut at both sides of one end heat-sealed to form the first seal 71, so that the first seal 71 is enclosed in a trapezoidal shape. Specifically, the cutting is performed along two dotted lines in fig. 2a to form a chamfer structure.
(2) The support strip 60 is placed inside the cylindrical air bag 70 and the cylindrical air bag 70 is flattened such that one side of the support strip 60 is flush with one end of the cylindrical air bag 70. At this time, as shown in fig. 2b, one side of the support strip 60 is pressed between the two air bags. One end of the cylindrical air bag 70 is then heat sealed together with one edge of the support strip 60. Wherein one end of the cylindrical air bag 70 which can be defined by heat sealing is a first sealing edge 71, and one end of the cylindrical air bag 70 which is far away from the first sealing edge 71 is a second sealing edge 72.
(3) As shown in fig. 2c, the first sealed edge 71 is folded inward into the cylindrical air bag 70, and a third sealed edge 73 is formed at the end of the cylindrical air bag 70 away from the second sealed edge 72. The third sealing edge 73 is a horizontal dashed line in fig. 2 c.
(4) As shown in fig. 2d, the two films between the first sealing edge 71 and the third sealing edge 73 are heat sealed along a predetermined heat sealing line 30. The heat seal lines 30 may be in the form of loops, fold lines, or discrete adhesive dots or segments connecting the inner and outer films by the heat seal lines 30.
(5) As shown in fig. 2e, the cylindrical air bag 70 is flattened and the third sealing edge 73 is heat sealed, and the first sealing edge 71 and the third sealing edge 73 together enclose the ambient air chamber 20. The ambient air chamber 20 is the trapezoidal area in fig. 2 e.
(6) As shown in fig. 2e, the second seal 72 is flattened and the end of the support strip 60 away from the first seal 71 is disposed within the second seal 72, and then the second seal 72 is heat sealed, at which time the second seal 72 and the third seal 73 together enclose the detection gas chamber 10. The detection gas chamber 10 is the rectangular area of fig. 2e, except for the trapezoidal area.
(7) As shown in fig. 2b, the first valve 40 is threaded through the membrane of the detection gas chamber 10 and fastened by screwing. As shown in fig. 2d, the second valve 50 is simultaneously passed through the membranes of the ambient gas chamber 20 and the detection gas chamber 10 and tightened by a nut washer. The first valve 40 and the second valve 50 may be made of Polytetrafluoroethylene (PTFE).
It should be noted that, the material of the air bag film and the support strip 60 may be PEEK or other material, the thickness of the material is 0.1mm, and the welding device may be a handheld heat sealing machine for edge sealing and welding of the air bag film. The heat sealing temperature is 150-350 ℃, the heating time is 1-3 s, and the press shaping holding time is 2-8 s; the welding width of the first sealed edge 71, the second sealed edge 72 and the third sealed edge 73 and the heat sealing line 30 is 3mm-10 mm.
EXAMPLE III
In a third aspect, the present invention provides a system for automatically collecting ambient background gas, comprising an airbag device 100 for automatically collecting ambient background gas according to any of the above embodiments, and an air source outlet device (not shown) or a flow guide tube 200. The gas source outlet device is used for pumping the gas to be detected into the detection gas chamber 10 through the first valve 40 so as to realize gas detection in the industrial field. As shown in fig. 3, the draft tube 200 includes a duct 201 and a mouthpiece 202 communicating with each other. The mouthpiece 202 is hermetically connected to the first valve 40, and is used for guiding the expired air of the user into the detection gas chamber 10 through the conduit 201, so as to realize expired air detection in the medical field.
Example four
In a fourth aspect, the present invention provides a method for automatically collecting ambient background gas, which is used for inputting target gas for detection.
As shown in fig. 4, the method comprises the following steps S101-S103.
And S101, hermetically connecting the gas source outlet device with the first valve 40, and opening the first valve 40 and the second valve 50. Specifically, the components of the gas source outlet device, such as a pipeline, a valve, a blowing nozzle, and the like, of the gas to be detected are connected with the first valve 40, and meanwhile, the tightness of the joint is ensured.
Step S102, slowly blowing or pumping the gas to be detected into the detection gas chamber 10 through the gas source outlet device until the detection gas chamber 10 is filled with the gas to be detected. The detection gas chamber 10 begins to expand slowly due to gas collection, and the ambient gas chamber 20 begins to suck ambient background gas around the gas to be detected under the action of negative pressure by pulling the support strip 60 and driving the heat-seal line 30, so that the ambient background gas gradually expands. The ambient air chamber 20 draws ambient background air due to the negative pressure created by the bulging.
In step S103, the first valve 40 and the second valve 50 are sequentially closed. The gas to be detected is collected, and meanwhile, the automatic collection of the environmental background gas is completed.
EXAMPLE five
In a fifth aspect, the invention is a method for automatically collecting ambient background air for medical breath detection.
As shown in fig. 5, the method comprises the following steps S201-S203.
Step S201, the conduit 201 of the draft tube 200 is hermetically connected to the first valve 40, the fitting manner may be interference fit, and the first valve 40 and the second valve 50 are opened.
In step S202, the person to be tested blows air through the mouthpiece 202, and blows the expired air into the detection gas chamber 10 until the detection gas chamber 10 is full of expired air. Specifically, the person to be tested slowly blows air into the detection gas chamber 10 through the blowing nozzle 202, and the ambient gas chamber 20 collects gas along with the gas chamber 10 to be tested.
Step S203, the first valve 40 and the second valve 50 are closed in sequence. The gas to be detected is collected, and meanwhile, the automatic collection of the environmental background gas is completed.
In the case of the air bag device for medical exhaled air detection, when the air bag device is in a flattened state, the detection gas chamber 10 is a rectangular air bag 300mm long and 118mm wide, and the ambient gas chamber 20 has an isosceles trapezoid structure, a long side 290mm, a short side 250mm, and a height 82 mm. 1160ml of alveolar gas can be collected after the detection gas chamber 10 is full, and 150ml of alveolar gas can be collected after the environmental gas chamber 20 is full. Generally speaking, in the field of medical exhaled air detection, the ambient background gas for auxiliary detection needs 100ml to meet the test requirement, and meanwhile, the pressure of the exhaled gas of a human body is about 6Kpa, which is within the safe use air pressure range of an air bag. This air pocket provides comparatively convenient sampling mode when can better satisfy the user demand promptly.
Further, in an embodiment, before the steps in the fourth embodiment and the fifth embodiment are implemented, the method further includes the following steps: performing a predetermined number of blow-evacuation bag washing operations on the detection gas chamber 10 and the ambient gas chamber 20 by a purging device (not shown in the figure); wherein, the blowing air is standard air after being filtered. The purpose of this step is to wash away the volatile substances of the material in the air bag film and the volatile substances generated by the heat sealing of the air bag film, and to avoid affecting the gas detection result.
In summary, according to the air bag device 100 for automatically collecting ambient background gas and the use method thereof provided by the invention, the ambient gas chamber 20 is arranged inside the detection gas chamber 10 to form a "primary-secondary bag" structure, when the gas to be detected enters the detection gas chamber 10, the detection gas chamber 10 is inflated and expanded, and as the outer wall of the film of the ambient gas chamber 20 is fixedly connected with the inner wall of the film of the detection gas chamber 10 along the preset heat sealing line 30, the ambient gas chamber 20 is also expanded and generated negative pressure, so that the ambient background gas can enter the ambient gas chamber 20, the gas to be detected and the ambient background gas can be collected at the same place and at the same time, and the gas detection precision in the industrial production and medical fields is ensured. Meanwhile, the automatic collection of the environmental background gas can be realized while the gas to be tested is collected, the complexity of sample collection is avoided, and the test cost and time are greatly saved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system or apparatus/terminal device and method can be implemented in other ways. For example, the above-described system or apparatus/terminal device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. An air bag device for automatically collecting ambient background gas is characterized by comprising a detection gas chamber and an ambient gas chamber which are formed by enclosing thin films; the environment gas chamber is arranged in the detection gas chamber, and the outer film wall of the environment gas chamber is fixedly connected with the inner film wall of the detection gas chamber along a preset heat sealing line; the detection gas chamber is provided with a first valve, and the first valve penetrates through a film of the detection gas chamber to enable the detection gas chamber to be communicated with the outside; the environment gas chamber is provided with a second valve, and the second valve simultaneously penetrates through the film of the detection gas chamber and the film of the environment gas chamber to enable the environment gas chamber to be communicated with the outside; when gas to be detected enters the detection gas cavity through the first valve, the detection gas cavity is inflated to expand, so that the environment gas cavity is driven to expand and generate negative pressure, and then the environment gas enters the environment gas cavity through the second valve.
2. An air bag apparatus for automatically collecting ambient background gas as recited in claim 1, wherein a support strip is provided within said detection gas chamber; one end of the supporting strip is connected with the inner wall of the detection gas chamber, and the other end of the supporting strip is connected with the outer wall of the environment gas chamber.
3. An air bag apparatus for automatically collecting ambient background air according to claim 2, wherein said film and said support strip are made of one or more of PEEK, PVF, PVDF, PTFE, FEP, and PFA; the thickness of the film is 0.02mm-0.2mm, and the gas inlet pressure of the detection gas cavity is within 10 Kpa.
4. A method of manufacturing an air bag apparatus for automatically collecting ambient background gas, for use in manufacturing an air bag apparatus for automatically collecting ambient background gas as claimed in any one of claims 1 to 3, comprising the steps of:
taking a cylindrical air bag made of a thin film material and provided with openings at the upper end and the lower end and a triangular support strip;
placing the support strip into the cylindrical air bag and flattening the cylindrical air bag, wherein one side of the support strip is flush with one end of the cylindrical air bag, and then, one end of the cylindrical air bag and one side of the support strip are subjected to heat sealing together; wherein, the end of the cylindrical air bag which is defined by heat sealing is a first sealed edge, and the end of the cylindrical air bag which is far away from the first sealed edge is a second sealed edge;
folding the first seal edge inward into the cylindrical air bag, wherein a third seal edge is formed at one end of the cylindrical air bag away from the second seal edge;
performing heat sealing on the two layers of films between the first sealing edge and the third sealing edge along a preset heat sealing line;
flattening the cylindrical air bag and performing heat sealing on the third sealing edge, wherein an environment air chamber is formed by the first sealing edge and the third sealing edge together;
flattening the second seal edge and enabling one end, far away from the first seal edge, of the support strip to be arranged in the second seal edge, then performing heat sealing on the second seal edge, and at the moment, forming a detection gas chamber by the second seal edge and the third seal edge in a surrounding mode;
passing a first valve through a membrane of the detection gas chamber and fastening by threads; a second valve is simultaneously passed through the membranes of the ambient and the test gas chambers and tightened by a nut washer.
5. The method of making an air bag apparatus for automatically collecting ambient background air according to claim 4, further comprising the steps of, prior to heat sealing said first seal,:
and flattening the cylindrical air bag, and cutting two sides of one end of the first sealing edge formed by heat sealing to ensure that the first sealing edge is enclosed to be trapezoidal.
6. The method of manufacturing an air bag apparatus for automatically collecting ambient background air according to claim 4 or 5, wherein the heat-sealing temperature is 150 ℃ to 350 ℃, the heating time is 1s to 3s, and the press-setting holding time is 2s to 8 s; the widths of the first sealing edge, the second sealing edge and the third sealing edge are 3mm-10 mm.
7. A system for automatically collecting ambient background gas, comprising an air bag means for automatically collecting ambient background gas according to any one of claims 1 to 3 and an air supply outlet means or duct; the gas source outlet device is used for pumping gas to be detected into the gas detection chamber through the first valve; the guide pipe comprises a guide pipe and a blowing nozzle which are communicated; the blowing nozzle is connected with the first valve in a sealing mode and used for guiding the expired air of the user into the detection gas chamber through the guide pipe.
8. A method for automatically collecting ambient background gas for input of a target gas for detection, comprising the steps of:
connecting the gas source outlet device with a first valve in a sealing way, and opening the first valve and a second valve;
slowly blowing or pumping gas to be detected into a detection gas chamber through a gas source outlet device until the detection gas chamber is filled with the gas to be detected;
and closing the first valve and the second valve in sequence.
9. A method for automatically collecting ambient background gas for medical breath detection, comprising the steps of:
connecting a guide pipe of the flow guide pipe with a first valve in a sealing manner, and opening the first valve and a second valve;
a person to be tested blows air through a blowing nozzle, and exhales air into a detection gas chamber until the detection gas chamber is full of the exhales air;
and closing the first valve and the second valve in sequence.
10. The method of automatically collecting ambient background air as recited in claim 8 or 9, further comprising the steps of:
performing blowing-emptying bag washing operation on the detection gas chamber and the environmental gas chamber for preset times through a blowing device; wherein, the blowing air is standard air after being filtered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111590351.9A CN114112554A (en) | 2021-12-23 | 2021-12-23 | Air bag device capable of automatically collecting ambient background air and preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111590351.9A CN114112554A (en) | 2021-12-23 | 2021-12-23 | Air bag device capable of automatically collecting ambient background air and preparation method and use method thereof |
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| CN202111590351.9A Pending CN114112554A (en) | 2021-12-23 | 2021-12-23 | Air bag device capable of automatically collecting ambient background air and preparation method and use method thereof |
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