CN109738428B - Chromogenic titration detection device and detection method for formaldehyde content in air - Google Patents
Chromogenic titration detection device and detection method for formaldehyde content in air Download PDFInfo
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- CN109738428B CN109738428B CN201910149041.XA CN201910149041A CN109738428B CN 109738428 B CN109738428 B CN 109738428B CN 201910149041 A CN201910149041 A CN 201910149041A CN 109738428 B CN109738428 B CN 109738428B
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Abstract
The invention discloses a chromogenic titration detection device for formaldehyde content in air and a detection method thereof, the device comprises an air collection device and a titration detection device, the titration detection device at least comprises a group of titration detection modules, the air collection device comprises an air inlet pipe, a bidirectional circulating suction air inlet assembly, a transition air pipe, an air collection assembly and an air outlet pipe, one end of the air inlet pipe is communicated and arranged at an air inlet of the bidirectional circulating suction air inlet assembly, one end of the transition air pipe is communicated and arranged at an air outlet of the bidirectional circulating suction air inlet assembly, the other end of the transition air pipe is communicated and arranged with the air collection assembly, the air collection assembly compresses collected air, the air inlet end of the air outlet pipe is communicated with the air collection assembly, and the air outlet end of an air test paper is arranged towards a detection injection air outlet on the titration detection module, the detection precision of the detection test paper on the formaldehyde content in the air can be improved.
Description
Technical Field
The invention belongs to the field of air detection, and particularly relates to a chromogenic titration detection device for formaldehyde content in air and a detection method thereof.
Background
Air detection refers to the detection of the composition of air. In the narrow sense of air detection, mainly from the application point of view, indoor air detection is the focus of research. The air quality detection device is used for detecting air quality by means of decoration pollution caused by substances harmful to human bodies contained in indoor decoration materials, furniture and the like and released into home and office environments. The main pollutants are: formaldehyde, benzene, ammonia gas, total volatile organic compounds TVOC, radioactive radon and the like, and the quality of indoor air directly influences the health of people, particularly the formaldehyde gas is colorless and odorless, but has great harm. Most of the existing formaldehyde air detection is carried out by a formaldehyde detector, but the detection cost is high, detection is carried out simply and quickly by adopting detection test paper, although the detection precision is not high, the cost is low, and the detection result can be quickly obtained.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a chromogenic titration detection device and a detection method for formaldehyde content in air, which can improve the detection precision of detection test paper for formaldehyde content in air.
The technical scheme is as follows: in order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a detection device is titrated in color development of formaldehyde content in air, includes air collecting device and titrates detection device, it contains a set of detection module of titrating at least to titrate detection device, air collecting device includes air intake pipe, two-way circulation suction air intake component, transition trachea, air collection subassembly and air outlet duct, the one end intercommunication of air intake pipe sets up the inlet port department at two-way circulation suction air intake component, transition trachea one end intercommunication sets up in the outlet port department of two-way circulation suction air intake component, just the tracheal other end of transition sets up with air collection subassembly intercommunication, the air that the subassembly compression was collected is collected to the air, the inlet end and the air collection subassembly intercommunication of air outlet duct, just the outlet end orientation of air outlet duct is titrated the detection test paper on the detection module and is given vent to the setting.
Furthermore, the bidirectional circulating suction air inlet assembly comprises a sleeve, a piston, a reciprocating rod and a displacement driving mechanism, wherein the sleeve is of a cylindrical closed shell structure with an inner cavity, the reciprocating rod is coaxially and movably arranged at one end of the sleeve in a penetrating manner, the piston is arranged at one end of the reciprocating rod extending into the inner cavity of the sleeve, the piston is arranged in a sealing and sliding manner, the inner cavity of the sleeve is divided into two relatively independent secondary cavities through the piston, and an air inlet hole and an air outlet hole are formed in sleeve wall bodies corresponding to the two secondary cavities; one end of the reciprocating rod, which is positioned outside the sleeve, is provided with a displacement driving mechanism; the relative chamber volumes of the two secondary chambers are slidably adjusted by the reciprocal displacement of the piston in the axial direction.
Furthermore, two the secondary chamber is first air cavity and second air cavity respectively, advance, the venthole all sets up and is being close to sleeve tip one side or setting on the sleeve tip, just advance, all be provided with the check valve on the venthole, advance, the venthole includes first inlet port, first venthole, second inlet port and second venthole, first inlet port, first venthole correspond the setting with first air cavity, second inlet port, second venthole correspond the setting with the second air cavity.
Furthermore, the air collection assembly comprises a gas collection container, a movable sealing plate, a pressure gauge and a linear displacement module, wherein the gas collection container is of a cylinder structure with one open end, the linear displacement module is arranged on the side adjacent to the open end of the gas collection container, the movable sealing plate is arranged at the driven end of the linear displacement module, the movable sealing plate is coaxially and slidably arranged in the gas collection container, the pressure gauge is arranged on the movable sealing plate, and the pressure gauge detects the pressure in the inner cavity of the gas collection container; the gas collection volume of the inner cavity of the gas collection container is adjusted through the displacement of the movable sealing plate relative to the gas collection container, and the constant pressure of the inner cavity of the gas collection container is kept.
Furthermore, the titration detection module comprises a detection plate and a reagent bottle, a test paper groove, a reagent groove and a reagent solution runner are concavely arranged on the detection plate, the reagent groove is adjacent to the test paper groove, the reagent solution runner is concavely arranged from the test paper groove downwards, the reagent solution runner is communicated with the reagent groove, and the detection test paper is placed in the test paper groove and contacts with a reagent solution infiltrating the flowing reagent; the reagent bottle is filled with reagent solution, the reagent bottle is arranged above the reagent groove at intervals, and the reagent bottle drops the reagent solution into the reagent groove.
Further, reagent solution runner is "fishbone" column structure, reagent solution runner includes sprue and subchannel, the sprue is established along the length direction of test paper recess is concave, and a plurality of the subchannel sets up respectively in the both sides of sprue, just sprue and subchannel intercommunication set up.
The detection device is characterized by further comprising a solution collection dish, wherein the solution collection dish is of a water tank-shaped structure, the opening side of the solution collection dish is abutted to the lower side of the detection plate, and a solution collection cavity is formed by the solution collection dish and the detection plate; the detection plate is concavely provided with an effusion groove, the effusion groove is concavely arranged right above the test paper groove, the peripheral outline of the effusion groove is larger than that of the test paper groove, the effusion groove is provided with a plurality of resorption holes which are communicated upwards and downwards along the periphery, a capillary tube is arranged in the resorption hole in a penetrating way, the top end of the capillary tube is not higher than the resorption hole, the bottom end of the capillary tube extends downwards into the solution collection cavity, and the distance between the capillary tube and the bottom wall of the solution collection cavity is equal to the distance between the capillary tube and the bottom wall of the solution collection cavity; and sucking away the reagent solution overflowing from the test paper groove through a capillary tube, so that the test paper is soaked in the reagent solution all the time, and the upper surface of the test paper is exposed in the air to be detected all the time.
Further, the top of pick-up plate is provided with violently the pipe, the one end of violently managing is sealed, and the other end and the end intercommunication of giving vent to anger of air outlet duct, violently manage one side towards the pick-up plate and link up and set up at least a set of micropore of giving vent to anger, the micropore of giving vent to anger is given vent to anger towards test paper and is set up at least a set of titration detection module along the length direction of violently managing in proper order, each group the micropore of giving vent to anger corresponds the setting with each pick-up plate.
Furthermore, the titration detection device further comprises a detection box and a circulating pipe, wherein the detection box is of a closed shell structure, two ends of the circulating pipe are respectively communicated with an inner cavity of the detection box and an inner cavity of a gas collection container of the air collection assembly, a one-way valve is arranged in the circulating pipe, and gas in the detection box can be introduced into the gas collection container.
A chromogenic titration detection method for formaldehyde content in air comprises the following steps:
s1: closing a switch valve on an air outlet pipe, starting a displacement driving mechanism, driving a reciprocating rod and a piston to slide and displace in a reciprocating manner in an inner cavity of a sleeve by the displacement driving mechanism, and under the state of the position of the piston, when the volume of a first air cavity is gradually reduced, the air in the first air cavity is discharged into a transition air pipe through a first air outlet hole and finally collected in an air collection container, and meanwhile, the volume of a second air cavity is gradually increased, and the second air cavity sucks air through a second air inlet hole;
when the piston moves reversely, the volume of the first air cavity is gradually increased, the first air cavity sucks air through the first air inlet hole, meanwhile, the volume of the second air cavity is gradually reduced, and the air in the second air cavity is discharged into the transition air pipe through the second air outlet hole and finally collected in the air collection container; collecting air until the air pressure in the air collection container is 0.12-0.15 MPa;
s2: continuously dropping reagent solution into the reagent groove by the reagent bottle, and soaking the reagent solution in the reagent solution flow channel by the detection test paper; opening a switch valve on an air outlet pipe, enabling air in the air collection container to rapidly flow to the detection test paper on the detection plate through the transverse pipe and the air outlet micropores, enabling the flowing air gas to have an initial speed and impact on the detection test paper with slight pressure, and enabling the reagent solution soaked on the detection test paper to be in color reaction with formaldehyde gas in the air;
meanwhile, the movable sealing plate is driven by the linear displacement module to carry out displacement fine adjustment, so that the inner cavity of the gas collection container is always kept at or close to 0.12MPa of internal pressure;
s3: after the air entering the detection box reacts with the detection test paper in a color development manner, the air flows back to the inner cavity of the gas collection container through the circulating pipe and circulates in a reciprocating manner until the color of the detection test paper is stable, the detection is finished, and the air in the gas collection container and the air in the detection box are gradually exhausted.
Has the advantages that: according to the invention, the air is sucked into the air collection assembly through the bidirectional circulating suction air inlet assembly, and the air is collected and compressed through the air collection assembly, so that the internal pressure of the collected air is also improved, when the air in the air collection assembly is released, the air is sprayed on the detection test paper soaked with the reagent solution at a certain initial speed, and the detected gas substance in the air can be in full contact reaction with the detection reagent solution on the test paper, so that the sufficiency of the contact reaction is greatly improved, and the detection precision of the detection test paper for detecting the detected substances such as formaldehyde in the air is improved; in addition, the air collection assembly and the detection box are communicated through the circulating pipe, so that the detected air can circularly flow in the detection box and the air collection assembly, the sufficient reaction of the detected object and the detection reagent in the air is further ensured, and the detection precision is improved.
Drawings
FIG. 1 is a perspective view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall internal structure of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of the present invention;
FIG. 4 is an enlarged schematic view of a portion B of FIG. 3 according to the present invention;
FIG. 5 is a schematic perspective view of the titration detection module according to the present invention;
FIG. 6 is an exploded view of the titration detection module of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in the attached drawings 1 to 3, a chromogenic titration detection device for formaldehyde content in air comprises an air collection device and a titration detection device, wherein the titration detection device at least comprises a group of titration detection module 13 which can comprise a plurality of groups of titration detection modules for detecting different substances in air, such as formaldehyde, sulfur dioxide and the like, so as to realize the multifunctionality and the multi-applicability, the air collection device comprises an air inlet pipe 2, a bidirectional circulating suction air inlet component 5, a transition air pipe 11, an air collection component 8 and an air outlet pipe 15, one end of the air inlet pipe 2 is communicated and arranged at an air inlet of the bidirectional circulating suction air inlet component 5, a gas dedusting and drying device 3 is further arranged on a pipeline of the air inlet pipe 2, and the gas dedusting and drying device 3 filters and removes impurities in the collected air and moisture in the dried air, reduce the foreign matter in the gas, guarantee the accuracy of test, 11 one end intercommunications of transition trachea set up in the gas outlet department of two-way circulation suction inlet assembly 5, just the other end and the air of transition trachea 11 collect the 8 intercommunications settings of subassembly, the air of 8 compression collection of air collection subassembly keeps the constant voltage state, the inlet end and the air collection subassembly 8 intercommunication of air outlet duct 15, just the end of giving vent to anger of air outlet duct 15 sprays towards titrating detection module 13 and gives vent to anger the setting, titrate the detection paper that contains infiltration reagent solution on the detection module 13, the end of giving vent to anger of air outlet duct sprays gas on to detection paper.
Air is sucked to the air collection component through the bidirectional circulation suction air inlet component, and air is collected and compressed through the air collection component, the internal pressure of the collected air is also improved, when the air in the air collection component is released, the air is sprayed on the detection test paper soaked with the reagent solution at a certain initial speed, the detected gas substance in the air can be fully in contact reaction with the detection reagent solution on the test paper, the contact reaction sufficiency is greatly improved, and the detection precision of the detected substances such as formaldehyde in the detection test paper detection air is improved.
Preferably, the titration detection device further comprises a detection box 29 and a circulating pipe 34, the detection box 29 is of a closed shell structure, the plurality of titration detection modules are arranged in the detection box 29, two ends of the circulating pipe 34 are respectively communicated with an inner cavity of the detection box 29 and an inner cavity of the gas collection container 14 of the air collection assembly 8, and a one-way valve is arranged in the circulating pipe 34, so that gas in the detection box 29 can be introduced into the gas collection container 14. After the air entering the detection box 29 and the detection test paper are subjected to color reaction, the air returns to the inner cavity of the air collection assembly 8 through the circulating pipe 34, and the air gas flows in a reciprocating circulation manner, so that the collected air sample can fully and completely react with the detection side reagent, and the detection accuracy is ensured.
As shown in fig. 2, the bidirectional circulation suction air intake assembly 5 includes a sleeve 51, a piston 54, a reciprocating rod 55 and a displacement driving mechanism 4, the sleeve 51 is a cylindrical closed shell structure with an inner cavity, the reciprocating rod 55 is coaxially and movably disposed on one end of the sleeve 51 in a penetrating manner, the piston 54 is disposed on one end of the reciprocating rod 55 extending into the inner cavity of the sleeve, the piston 54 is disposed in a sealing and sliding manner, the inner cavity of the sleeve 51 is divided into two relatively independent secondary cavities by the piston, and an air inlet and an air outlet are disposed on sleeve wall bodies corresponding to the two secondary cavities; one end of the reciprocating rod 55 positioned outside the sleeve 51 is provided with a displacement driving mechanism 4; the displacement driving mechanism is a linear displacement mechanism such as a cam mechanism or an air cylinder, and the relative chamber volumes of the two secondary cavities are adjusted by the reciprocating displacement of the piston 54 along the axial direction in a sliding manner. The two secondary cavities are respectively a first air cavity 52 and a second air cavity 53, the air inlet and the air outlet are arranged on one side close to the end part of the sleeve 51 or on the end part of the sleeve, the check valves 58 are arranged on the air inlet and the air outlet, the air inlet and the air outlet comprise a first air inlet hole, a first air outlet hole, a second air inlet hole and a second air outlet hole, the first air inlet hole, the first air outlet hole and the first air cavity 52 are correspondingly arranged, and the second air inlet hole, the second air outlet hole and the second air cavity are correspondingly arranged. Closing the switch valve 33 on the air outlet pipe 15, starting the displacement driving mechanism 4, driving the reciprocating rod 55 and the piston 54 to perform reciprocating sliding displacement in the inner cavity of the sleeve 51 by the displacement driving mechanism, and in the position state of the piston 54, when the volume of the first air cavity 52 is gradually reduced, the air in the first air cavity 52 is discharged into the transition pipe 11 through the first air outlet hole and is finally collected in the air collection container 14, meanwhile, the volume of the second air cavity 53 is gradually increased, and the second air cavity 53 sucks air through the second air inlet hole;
when the piston is displaced in the reverse direction, the volume of the first air chamber 52 is gradually increased, the first air chamber 52 sucks air through the first air inlet hole, and simultaneously, the volume of the second air chamber 53 is gradually decreased, and the air in the second air chamber 53 is discharged into the transition air pipe 11 through the second air outlet hole and finally collected in the air collecting container 14. Collect the air gas simultaneously through two air intake pipe 2, can accelerate the sampling speed of air, moreover, the length of extension air intake pipe can carry out multiposition, diversified air sampling to the air in the space through two air intake pipe 2, avoids exceeding standard or the few content of materials such as certain place formaldehyde and causes detection error.
As shown in fig. 1 to fig. 3, the air collection assembly 8 includes a gas collection container 14, a movable sealing plate 16, a pressure gauge 6 and a linear displacement module 7, the gas collection container 14 is a cylinder structure with an open end, the linear displacement module 7 is disposed adjacent to the open end of the gas collection container 14, the driven end of the linear displacement module 7 is provided with the movable sealing plate 16, the movable sealing plate is coaxially slidably disposed in the gas collection container 14, the movable sealing plate 16 is provided with the pressure gauge 6, and the pressure gauge detects the pressure in the inner cavity of the gas collection container 14; the gas collection volume of the inner cavity of the gas collection container 14 is adjusted through the displacement of the movable sealing plate 16 relative to the gas collection container 14, the inner cavity of the gas collection container 14 is kept at a constant pressure, and air is collected until the air pressure in the gas collection container 14 is 0.12-0.15 MPa.
As shown in fig. 4 to 6, the titration detection module 13 includes a detection plate 20 and a reagent bottle 10, the detection plate 20 is provided with a test paper groove 23, a reagent groove 24 and a reagent solution channel 25 in a concave manner, the reagent groove 24 is adjacent to the test paper groove 23, the reagent solution channel 25 is provided in a concave manner from the test paper groove 23, the reagent solution channel 25 is communicated with the reagent groove 24, and the detection test paper is placed in the test paper groove and contacts with the reagent solution infiltrating the reagent flowing channel 25; the reagent bottle 10 is filled with reagent solution, the reagent bottle interval is arranged above the reagent groove 24, and the reagent bottle 10 drops the reagent solution into the reagent groove 24 drop by drop. The reagent solution flows into the reagent solution channel 25 through the reagent groove 24, the test paper arranged above the reagent solution channel absorbs and soaks the reagent solution, the reagent solution channel 25 is of a fishbone-shaped structure, the reagent solution channel 25 comprises a main channel 28 and sub-channels 26, the main channel 28 is concavely arranged along the length direction of the reagent solution channel 24, the sub-channels 26 are respectively arranged on two sides of the main channel 28, and the main channel is communicated with the sub-channels, so that the test paper can be ensured to be sufficiently soaked in the reagent solution.
The detection device further comprises a solution collection dish 21, wherein the solution collection dish 21 is of a water tank-shaped structure, the open side of the solution collection dish 21 is abutted to the lower side of the detection plate 20, and the solution collection dish 21 and the detection plate 20 form a solution collection cavity; the detection plate 20 is concavely provided with a liquid accumulation groove 22, the liquid accumulation groove 22 is concavely arranged right above the test paper groove 23, the peripheral outline of the liquid accumulation groove 22 is larger than that of the test paper groove 23, the liquid accumulation groove 23 is provided with a plurality of suck-back holes 31 which are communicated upwards and downwards along the periphery, a capillary 27 is arranged in each suck-back hole 31 in a penetrating manner, the top end of each capillary 27 is not higher than each suck-back hole 31, the bottom end of each capillary 27 extends downwards into the solution collection cavity, and the distance between the capillaries 27 and the bottom wall of the solution collection cavity is equal to the distance between the capillaries 27 and the bottom wall of the solution collection cavity; the reagent solution overflowing from the test paper groove 23 is sucked away through the capillary 27, so that the test paper is soaked in the reagent solution all the time, and the upper surface of the test paper is always exposed in the air to be detected, so that the air introduced into the test box 29 can directly act on the test paper, flowing air passes through the test paper and reacts with the reagent in a contact reaction color development manner, and the reagent solution above the test paper is sucked back through the capillary, so that the waste of the reagent solution can be avoided under the condition that the test paper is completely soaked, meanwhile, the air gas is also prevented from directly reacting with the reagent solution outside the test paper, the quality to be detected in the air is ensured, and if the formaldehyde gas can be completely only in the contact and color development reaction of the reagent solution on the test paper, so that the most accurate color development result is obtained, and the accuracy of the test is ensured.
The inner wall top of detection 29 is provided with violently pipe 19, the one end of violently pipe 19 is sealed, and the other end and the end intercommunication of giving vent to anger of air outlet duct 15, violently pipe 19 link up towards one side of pick-up plate 20 and has seted up at least a set of micropore 30 of giving vent to anger, the micropore 30 of giving vent to anger is given vent to anger towards test paper and is set up, at least a set of detection module 13 of titrating is arranged along the length direction of violently pipe 19 in proper order in detection case 29, each group the micropore 30 of giving vent to anger corresponds the setting with each pick-up plate, gives vent to anger the micropore 30 through a plurality of groups and directly corresponds test paper to ensure that the air homoenergetic that is surveyed acts on test paper, guarantees contact reaction's sufficiency, improves and detects the accuracy.
A chromogenic titration detection method for formaldehyde content in air comprises the following steps:
s1: closing the switch valve 33 on the air outlet pipe 15, starting the displacement driving mechanism 4, driving the reciprocating rod 55 and the piston 54 to perform reciprocating sliding displacement in the inner cavity of the sleeve 51 by the displacement driving mechanism, and in the position state of the piston 54, when the volume of the first air cavity 52 is gradually reduced, the air in the first air cavity 52 is discharged into the transition pipe 11 through the first air outlet hole and is finally collected in the air collection container 14, meanwhile, the volume of the second air cavity 53 is gradually increased, and the second air cavity 53 sucks air through the second air inlet hole;
when the piston moves reversely, the volume of the first air cavity 52 is gradually increased, the first air cavity 52 sucks air through the first air inlet hole, meanwhile, the volume of the second air cavity 53 is gradually reduced, and the air in the second air cavity 53 is discharged into the transition air pipe 11 through the second air outlet hole and finally collected in the air collecting container 14; collecting air until the air pressure in the air collection container 14 is 0.12-0.15 MPa;
s2: the reagent bottle continuously drops reagent solution into the reagent groove 24, and the detection test paper soaks the reagent solution in the reagent solution flow channel 25; opening a switch valve 33 on an air outlet pipe 15, enabling air in the air collection container 14 to rapidly flow to the detection test paper on the detection plate 20 through the transverse pipe 19 and the air outlet micropores 30, enabling the flowing air gas to have an initial speed and impact on the detection test paper with slight pressure, and enabling the reagent solution soaked on the detection test paper to be in color reaction with formaldehyde gas in the air;
meanwhile, the movable sealing plate 16 is driven by the linear displacement module to carry out displacement fine adjustment, so that the inner cavity of the gas collection container 14 is always kept at or close to 0.12MPa of internal pressure;
s3: after the air entering the detection box 29 reacts with the detection test paper in a color development manner, the air flows back to the inner cavity of the air collection container 14 through the circulating pipe 34, the air is circulated in a reciprocating manner until the color of the detection test paper is stable, the detection is finished, and the air in the air collection container and the air in the detection box are gradually exhausted.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. The utility model provides a detection device is titrated in color development of formaldehyde content in air which characterized in that: including air collection device and titration detection device, titration detection device contains a set of titration detection module (13) at least, air collection device includes air intake pipe (2), two-way circulation suction subassembly (5) of admitting air, transition trachea (11), air collection subassembly (8) and air outlet duct (15), the one end intercommunication setting of air intake pipe (2) is in the air inlet department of two-way circulation suction subassembly (5) of admitting air, transition trachea (11) one end intercommunication sets up in the air outlet department of two-way circulation suction subassembly (5) of admitting air, just the other end and the air collection subassembly (8) intercommunication setting of transition trachea (11), the air of air collection subassembly (8) compression collection, the inlet end and the air collection subassembly (8) intercommunication of air outlet duct (15), be provided with ooff valve (33) on air outlet duct (15), the air outlet end of the air outlet pipe (15) faces to the detection test paper on the titration detection module (13) and is arranged in an air spraying mode;
the bidirectional circulating suction air inlet assembly (5) comprises a sleeve (51), a piston (54), a reciprocating rod (55) and a displacement driving mechanism (4), wherein the sleeve (51) is of a cylindrical closed shell structure with an inner cavity, the reciprocating rod (55) is coaxially arranged on one end of the sleeve (51) in a penetrating and movable mode, the piston (54) is arranged at one end, extending into the inner cavity of the sleeve, of the reciprocating rod (55), the piston (54) is arranged in a sealing and sliding mode, the inner cavity of the sleeve (51) is divided into two relatively independent secondary cavities through the piston, and air inlet and outlet holes are formed in sleeve wall bodies corresponding to the two secondary cavities; one end of the reciprocating rod (55) positioned outside the sleeve (51) is provided with a displacement driving mechanism (4); slidably adjusting the relative chamber volumes of the two secondary chambers by reciprocal displacement of the piston (54) in the axial direction;
the two secondary cavities are respectively a first air cavity (52) and a second air cavity (53), the air inlet holes and the air outlet holes are arranged on the end part of the sleeve and are respectively provided with a one-way valve (58), the air inlet holes and the air outlet holes comprise a first air inlet hole (56a), a first air outlet hole (56b), a second air inlet hole (57a) and a second air outlet hole (57b), the first air inlet hole (56a) and the first air outlet hole (56b) are arranged corresponding to the first air cavity (52), and the second air inlet hole (57a) and the second air outlet hole (57b) are arranged corresponding to the second air cavity;
the air collection assembly (8) comprises an air collection container (14), a movable sealing plate (16), a pressure gauge (6) and a linear displacement module (7), the air collection container (14) is of a cylinder structure with an opening at one end, the linear displacement module (7) is arranged on the side adjacent to the opening of the air collection container (14), the movable sealing plate (16) is arranged at the driven end of the linear displacement module (7), the movable sealing plate is coaxially and slidably arranged in the air collection container (14), the pressure gauge (6) is arranged on the movable sealing plate (16), and the pressure gauge detects the pressure in the inner cavity of the air collection container (14); the gas collection volume of the inner cavity of the gas collection container (14) is adjusted through the displacement of the movable sealing plate (16) relative to the gas collection container (14), and the inner cavity of the gas collection container (14) is kept at a constant pressure;
the titration detection module (13) comprises a detection plate (20) and a reagent bottle (10), wherein a test paper groove (23), a reagent groove (24) and a reagent solution runner (25) are concavely arranged on the detection plate (20), the reagent groove (24) is adjacent to the test paper groove (23), the reagent solution runner (25) is concavely arranged downwards from the test paper groove (23), the reagent solution runner (25) is communicated with the reagent groove (24), and the detection test paper is placed in the test paper groove and contacts with the reagent solution in the reagent solution runner (25); reagent solution is contained in the reagent bottle (10), the reagent bottle is arranged above the reagent groove (24) at intervals, and the reagent solution is dripped into the reagent groove (24) by the reagent bottle (10);
the detection device is characterized by further comprising a solution collecting dish (21), wherein the solution collecting dish (21) is of a water tank-shaped structure, the opening side of the solution collecting dish (21) is abutted to the lower side of the detection plate (20), and the solution collecting dish (21) and the detection plate (20) form a solution collecting cavity (210); the detection plate (20) is concavely provided with an effusion groove (22), the effusion groove (22) is concavely arranged right above the test paper groove (23), the peripheral outline of the effusion groove (22) is larger than that of the test paper groove (23), the effusion groove (22) is provided with a plurality of resorption holes (31) which are penetrated upwards and downwards along the circumference, a capillary tube (27) is penetrated in the resorption hole (31), the top end of the capillary tube (27) is not higher than the resorption hole (31), the bottom end of the capillary tube (27) extends downwards to the solution collection cavity (210), and the capillary tube (27) is arranged on the bottom wall of the solution collection cavity (210) at intervals; sucking away the reagent solution overflowing from the test paper groove (23) through a capillary (27), so that the test paper is soaked in the reagent solution all the time, and the upper surface of the test paper is exposed in the air to be detected all the time;
a transverse pipe (19) is arranged above the detection plate (20), one end of the transverse pipe (19) is closed, the other end of the transverse pipe is communicated with the air outlet end of the air outlet pipe (15), one side, facing the detection plate (20), of the transverse pipe (19) is provided with at least one group of air outlet micropores (30) in a penetrating manner, the air outlet micropores (30) are arranged towards the air outlet of the detection test paper, at least one group of titration detection modules (13) are sequentially arranged along the length direction of the transverse pipe (19), and each group of air outlet micropores (30) is arranged corresponding to each detection plate;
the titration detection device further comprises a detection box (29) and a circulating pipe (34), the detection box (29) is of a closed shell structure, two ends of the circulating pipe (34) are respectively communicated with an inner cavity of the detection box (29) and an inner cavity of a gas collection container (14) of the air collection assembly (8), a one-way valve is arranged in the circulating pipe (34), and gas in the detection box (29) can be introduced into the gas collection container (14).
2. The chromogenic titration detection device for formaldehyde content in air according to claim 1, characterized in that: reagent solution runner (25) are "fishbone" column structure, reagent solution runner (25) include sprue (28) and subchannel (26), sprue (28) are along the length direction concave establishment of test paper recess (23), a plurality of subchannel (26) set up respectively in the both sides of sprue (28), just sprue and subchannel intercommunication set up.
3. A chromogenic titration detection method for formaldehyde content in air, which adopts the chromogenic titration detection device for formaldehyde content in air according to any one of claims 1 to 2, characterized in that: the method comprises the following steps:
s1: closing a switch valve (33) on an air outlet pipe (15), starting a displacement driving mechanism (4), driving a reciprocating rod (55) and a piston (54) to perform reciprocating sliding displacement in an inner cavity of a sleeve (51) by the displacement driving mechanism, and discharging air in a first air cavity (52) into a transition air pipe (11) through a first air outlet hole (56b) and finally collecting the air in an air collection container (14) when the volume of the first air cavity (52) is gradually reduced under the position state of the piston (54), wherein simultaneously, the volume of a second air cavity (53) is gradually increased, and the second air cavity (53) sucks air through a second air inlet hole (57 a);
when the piston moves reversely, the volume of the first air cavity (52) is gradually increased, the first air cavity (52) sucks air through the first air inlet hole (56a), meanwhile, the volume of the second air cavity (53) is gradually reduced, and the air in the second air cavity (53) is discharged into the transition air pipe (11) through the second air outlet hole (57b) and finally collected in the air collection container (14); collecting air until the air pressure in the air collection container (14) is 0.12-0.15 MPa;
s2: the reagent bottle continuously drops reagent solution into the reagent groove (24), and the detection test paper soaks the reagent solution in the reagent solution flow channel (25); opening a switch valve (33) on an air outlet pipe (15), enabling air in the air collection container (14) to rapidly flow to the detection test paper on the detection plate (20) through the transverse pipe (19) and the air outlet micropores (30), enabling the flowing air gas to have an initial speed and impact on the detection test paper with slight pressure, and enabling the reagent solution soaked on the detection test paper to be in color reaction with formaldehyde gas in the air;
meanwhile, the movable sealing plate (16) is driven by the linear displacement module to carry out displacement fine adjustment, so that the inner cavity of the gas collection container (14) is always kept at the internal pressure of 0.12 MPa;
s3: after the air entering the detection box (29) reacts with the detection test paper in a color development manner, the air flows back to the inner cavity of the gas collection container (14) through the circulating pipe (34) and circulates in a reciprocating manner until the color of the detection test paper is stable, the detection is finished, and the air in the gas collection container and the air in the detection box are gradually exhausted.
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| CN115463579B (en) * | 2022-09-13 | 2023-08-04 | 江苏众利海洋科技有限公司 | Food detection device with food refrigeration function and implementation method thereof |
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