KR20220155781A - Passive Gas Sample Assessment Unit - Google Patents

Abstract

The present invention relates to a passive gas sample evaluation device configured to automatically replace an adsorption tube at a specific time during a passive gas sample evaluation experiment. The passive gas sample evaluation device comprises: a housing having a circular opening formed on the top surface thereof; a bottom plate provided on the inner bottom surface of the housing; a rotating shaft installed upright at the center of the bottom plate and provided to rotate about the shaft by power applied from the outside; a circular top plate coupled to the top of the rotating shaft, rotating together with the rotating shaft while sealing the opening, and having an open hole; a plurality of sample holders arranged on a concentric circle based on the central point of the bottom plate to be spaced at regular intervals; and a plurality of adsorption tubes each of which is a tubular member having the bottom fixedly inserted into the sample holder, and which has the top coming into contact with the bottom surface of the top plate so that the top of an introduced adsorption substance is exposed to the outside air through the open hole as the top plate rotates. With the rotation of the top plate, the open holes sequentially communicate with the plurality of adsorption tubes.

Description

Passive Gas Sample Assessment Unit {Passive Gas Sample Assessment Unit}

The present invention relates to a passive gas sample evaluation device configured to automatically replace an adsorption tube at a predetermined time during a passive gas sample evaluation experiment.

Indoor air quality can vary widely depending on building structure, ventilation conditions, region, season, etc., and indoor air pollution is caused by chemicals emitted from wallpaper, paint, furniture, and building materials, or inflow of polluted air. .

Chemical substances in the indoor space cause so-called "Sick House Syndrome (SHS)" such as headache, sore eyes, nose and throat, dry cough, dry skin and itching, or fatigue, headache, dizziness, drowsiness, heartburn Because it causes "Multiple Chemical Sensitivity (MCS)" such as abnormal heartbeat, multi-use facilities, etc., strictly manage the concentration of harmful substances such as volatile organic compounds or formaldehyde indoors.

To evaluate the concentration of volatile organic pollutants or formaldehyde in indoor air, the active gas sampling method (Active gas sampling method) and passive gas sampling method using a method in which chemical molecules moved by advection and diffusion are naturally adsorbed by installing an adsorption pipe in an indoor space.

Unlike the active method, in which air is sucked in by a pump and flowed through an adsorption tube, the passive gas sampling method, which relies on advection and molecular diffusion, does not require an additional device such as a pump, and maintains operating conditions during the sampling period. Since it is not necessary, it has the advantage that non-professionals can easily install it, and its utilization is increasing recently.

In particular, in the past, passive gas sampling devices required a long sampling time of more than one week, but as the performance of the passive adsorption tube has recently improved, only sampling for a relatively short time of several hours to one day is required even under low-concentration conditions, which is a general living environment. measurement became possible. Various products are on the market depending on the manufacturer. Although there are differences in sampling sensitivity and adsorption capacity depending on the product, it is okay to use any product as long as there is no problem with basic performance.

However, in the case of the passive gas sampling method, indoor air quality is evaluated through the total amount of pollutants adsorbed during the sampling period. It is inconvenient to constantly visit and continuously replace the suction tube.

Therefore, if a passive gas sampling device for indoor air quality evaluation that automatically replaces the suction tube can be developed, the time and cost required in the process of constantly visiting the site and replacing the suction tube by the measurer can be reduced, as well as accurate timing It is expected that the ease of data interpretation according to the automatic replacement of the suction tube in the field and the implementation effect of long-term indoor air quality monitoring in the field are expected.

For the above reasons, there is a growing need for a sample evaluation device capable of preventing an experimenter from entering an experiment space and influencing the concentration of contaminants and obtaining accurate experiment results by replacing the adsorption tube at regular intervals.

1. Registration No. 10-0812663 "Odor and VOC sample collection device using an adsorption tube" 2. Registration No. 10-0933194 "Adsorption tube unit capable of temperature control by section and thermal desorption method using the same" 3. Registration No. 10-2031438 "Thermal Analysis Experiment Device"

An object of the present invention is to provide a passive gas sample evaluation device configured to obtain highly reliable test results by changing an adsorption tube exposed to air in which the upper plate is configured to rotate according to a certain time during a passive gas sample evaluation experiment. .

In order to solve the above problems, the present invention is "a housing having a circular opening on the upper surface, a bottom plate provided on the inner surface of the housing, and installed in the center of the bottom plate, provided to pivot by power applied from the outside. A rotating shaft coupled to the upper end of the rotating shaft to rotate together with the rotating shaft while sealing the opening, a disk-shaped top plate having an open hole, a plurality of sample holders spaced apart from each other at regular intervals on a concentric circle based on the center point of the bottom plate, and A tubular member whose lower end is inserted into and fixed to the sample holder, the upper end of which is in contact with the lower surface of the upper plate, and which rotates the upper plate so that the upper end of the adsorbent inserted inside is exposed to the outside air through the opening hole. A passive gas sample evaluation device comprising two adsorption tubes and configured such that the open holes sequentially communicate with the plurality of adsorption tubes according to the rotation of the upper plate.

In addition, the present invention further includes an auxiliary top plate that is stacked and arranged so as to come into close contact with the upper or lower surface of the top plate and has an auxiliary opening corresponding to the opening on the plate surface, wherein the auxiliary top plate is rotated so that the auxiliary opening is specified. In a state of communicating with the adsorption pipe, the top plate rotates so that the open hole communicates with the auxiliary open hole, so that outside air reaches the upper end of the adsorbent material.

In addition, the rotating shaft further includes an outer shaft formed with a longitudinal conduit and an inner shaft inserted into the conduit and formed to protrude more upward than the outer shaft, and the upper ends of the inner shaft and the outer shaft are the centers of the top plate and the auxiliary top plate, respectively. Coupled to one by one, the top plate and the auxiliary top plate may be configured to rotate, respectively.

In addition, the sample holder may further include a spring provided in the longitudinal direction and an elastic support portion at an upper end of the spring.

According to the present invention, there are the following effects.

1. The upper plate rotates according to the time set in the timer and the exposed suction tube is automatically changed, so replacement work by manpower is unnecessary, and continuous data can be obtained with minimum replacement time.

2. As the experimenter can replace the adsorption tube without constantly entering the field to replace the adsorption tube, it minimizes the external factors caused by the inflow of outside air during entry and exit, reducing the variables of the experimental data and obtaining more accurate data. can

3. Even if adsorption tubes of different lengths are used, the height of the fixed holder can be adjusted, so passive gas sample evaluation can be performed regardless of the length of the adsorption tube.

1 shows a state in which the upper plate of the passive gas sample evaluation device according to the present invention is separated.
2 shows a state in which the outer cover of the passive gas sample evaluation device according to the present invention is removed.
3 is a plan view of the passive gas sample evaluation device according to the present invention in a state where the top plate is removed.
[Fig. 4] to [Fig. 6] are one embodiment of the present invention provided with the top plate and the auxiliary top plate, showing a process in which the opening and the auxiliary opening are communicated according to the rotation of the top plate and the auxiliary top plate in order.
[Figure 7] is a cross-sectional view showing the cross-sectional structure of the outer shaft and the inner shaft of the rotation shaft according to the present invention.
[Fig. 8] is a cross-sectional view in which an elastic support part and a spring are added to the sample holder according to the present invention.

Hereinafter, the present invention will be described in more detail through examples. Since these examples are intended to illustrate the present invention only, the scope of the present invention is not to be construed as being limited by these examples.

Hereinafter, in the present invention, it is clarified that all members not described as 'plural' are formed of a single member and configuration.

In the present invention, the housing 10 having a circular opening on the upper surface, the bottom plate 100 provided on the inner lower surface of the housing 10, erected and installed at the center of the bottom plate 100, A rotating shaft 200 provided to rotate by a rotating shaft 200, coupled to the upper end of the rotating shaft 200 to rotate together with the rotating shaft 200 while sealing the opening, and a disk-shaped top plate 400 having an opening 410 formed therein , A plurality of sample holders 300 arranged at regular intervals on a concentric circle based on the center point of the bottom plate 100 and a tubular member whose lower end is inserted and fixed into the sample holder 300, the upper end of which is the upper plate 400 ) A plurality of adsorption tubes 600 in contact with the lower surface and exposed to the outside air through the opening 410 so that the upper end of the adsorbent material 620 inserted in accordance with the rotation of the upper plate 400 and configured such that the open hole 410 sequentially communicates with the plurality of adsorption tubes 600 according to the rotation of the top plate 400”.

Hereinafter, the present invention will be described in detail in conjunction with the accompanying drawings.

Referring to FIG. 1 , a state in which the top plate 400 of the passive gas sample evaluation device is separated is shown.

It is preferable that the housing 10 is formed with a sealed inner space so that outside air cannot enter and exit the inside except for the circular opening on the upper surface. This is because a plurality of adsorption tubes 600 for sequentially adsorbing pollutant gases are accommodated inside the housing 10, so that the rest of the adsorption tubes except for the adsorption tubes 600 exposed to the outside air through the open holes 410 are accommodated. The tube 600 seals the inner space of the housing 10 so as not to come into contact with outside air so that accurate test results can be obtained.

The housing 10 is not limited in shape, but may affect the experimental results when contaminants pass through and react with the adsorption tube 600 accommodated therein. can

The bottom plate 100 may be provided on an inner lower surface of the housing 10 .

The rotating shaft 200 is built and installed at the center of the bottom plate 100, and can be rotated by power applied from the outside. The lower end of the rotating shaft 200 may be configured to contact the bottom plate 100 and the upper end to contact the top plate 400 . In addition, the rotating shaft 200 may be rotated under the control of a control unit (not shown).

The control unit (not shown) controls the on/off, shaft rotation speed, direction, etc. of the rotating shaft 200 to adjust the exposure and replacement timing of the suction tube 600 to conduct more precise and diverse experiments. can do.

The upper plate 400 is formed in a disk shape and may come into contact with an upper portion of the housing 10 in which a circular opening is formed. The upper plate 400 may completely cover the circular opening to seal the reaction space of the housing 10 . In addition, one open hole 410 corresponding to the suction tube 600 may be formed in the upper plate 400 . As the top plate 400 is connected to the rotating shaft 200 and rotates under the control of the control unit (not shown), the open hole 410 of the top plate 400 is formed on the upper surface of the suction pipe 600. It can be rotated so that it sequentially touches.

The open hole 410 may be formed on the surface of the upper plate 400 in a size corresponding to that of the suction pipe 600 . When the top plate 400 rotates as the rotating shaft 200 rotates, the open hole 410 also rotates so that the upper surface of the suction tube 600 and the contaminants can react through it.

The sample holder 300 is composed of a plurality and can be spaced apart at regular intervals on a concentric circle based on the center point of the bottom plate 100, and the suction tube 600 is inserted into the sample holder 300 to By conducting the experiment, the adsorption tube 600 can be fixed more stably.

The adsorption tube 600 is a tubular member inserted into and fixed to the sample holder 300, and the upper end of the adsorption tube 600 is in close contact with the lower surface of the upper plate 400 to be rotated, and the lower end of the adsorption tube 600 is the sample holder 300. It may be inserted into the holder 300 and fixed. In addition, the adsorption pipe 600 is a tubular member having a hollow inside, and the internal hollow is filled with an adsorption material 620. In addition, as the top plate 400 is connected to the rotating shaft 200 and rotates, one of the plurality of suction tubes 600 inserted and fixed into the sample holder 300 is attached to the top plate 400. Corresponding to the position of the open hole 410 formed in ), contaminants can be adsorbed as it comes into contact with the outside air. At this time, the adsorption tube 600 has the sample holder 300 at the lower end and a plurality of other adsorption tubes 600 except for one adsorption tube 600 adsorbing contaminants at the upper end. ) are in close contact with the upper plate 400 and do not adsorb contaminants at the same time.

In addition, it is configured to further include an auxiliary top plate 500 stacked so as to come into close contact with the upper or lower surface of the top plate 400 and having auxiliary openings 510 corresponding to the openings 410 formed on the plate surface. can

The auxiliary top plate 500 may be formed in a disk shape and stacked so as to come into close contact with the top or bottom surface of the top plate 400 . The auxiliary opening 510 corresponding to the opening 410 may be formed on the plate surface of the auxiliary top plate 500 . In addition, as the auxiliary top plate 500 is connected to the rotating shaft 200 and rotates under the control of the control unit (not shown), the auxiliary opening 510 of the auxiliary top plate 500 can also rotate. .

The auxiliary opening 510 may be formed on the surface of the auxiliary top plate 500 in a size corresponding to that of the suction pipe 600 . As the rotating shaft 200 pivots, the top plate 400 and the auxiliary top plate 500 can rotate, and accordingly, the opening 410 and the auxiliary opening 510 also rotate to the suction tube. It can be positioned so that the upper surface of the 600 and the contaminants react through it. At this time, the upper plate 400 and the auxiliary upper plate 500 are moved at different timings with a certain time difference according to the control of the control unit (not shown) to minimize the inflow of contaminants and increase the accuracy of the experimental results. desirable.

This will be explained in detail through [Fig. 4] to [Fig. 6].

4 to 6 show that the top plate 400 and the auxiliary top plate 500 are in contact with each other, and the opening 410 and the auxiliary opening 510 are respectively formed according to the rotation of the rotating shaft 200. It shows a process of changing the adsorption tube 600 that rotates and sequentially reacts with contaminants.

Referring to FIG. 4 , the open hole 410 and the auxiliary open hole 510 may be positioned at the same location to communicate with each other so as to be exposed to the outside air, and the upper surface of the suction tube 600 is exposed to the outside air, so that the suction tube 600 is exposed to the outside air. (600) The adsorption material 620 on the upper surface may react with contaminants in the outside air. At this time, the width or shape of the open hole 410 and the auxiliary open hole 510 is the same as that of the suction pipe 600 so that contaminants can smoothly come into contact with the upper surface of the suction pipe 600. It can be.

Referring to FIG. 5, as the rotation shaft 200 pivots and the auxiliary top plate 500 rotates under the control of the control unit (not shown), the position of the auxiliary opening 510 moves. do.

In more detail, [FIG. 5] shows that as the auxiliary opening 510 moves to correspond to the upper surface of the new suction tube 600 being replaced, the lower end of the opening 410 is closed by the auxiliary top plate 500 to allow outside air to flow. The process of being isolated from the inside without being introduced is shown.

6 shows that the top plate 400 rotates along the previously moved auxiliary top plate 500, and as the position of the opening 410 moves, the opening 410 moves along the auxiliary opening 510. ) and the process of communicating with it.

[FIG. 6] shows a new adsorption pipe 600 in which external contaminants are changed through the communicating space as the positions of the open hole 410 and the auxiliary open hole 510 coincide with each other when compared to [FIG. 5]. can react with the upper surface of

Therefore, the top plate 400 and the auxiliary top plate 500 are stacked and disposed in close contact, and the top plate 400 and the auxiliary top plate 500 are directed in the same direction according to the control of the control unit (not shown). Since it rotates at intervals of time, the upper surface of the suction tube 600, excluding the suction tube 600 exposed to the outside air, is in contact with the top plate 400 or the auxiliary top plate 500 among the plurality of suction tubes 600. It is configured to react with contaminants contained in the outside air only when communicating with the open hole 410 or the auxiliary open hole 510 without being exposed to the outside air, thereby improving the accuracy of the experimental results.

In addition, the rotating shaft 200, the outer shaft 210 is formed with a longitudinal conduit 230; and an inner shaft 220 inserted into the conduit 230 and formed to protrude more upward than the outer shaft 210, wherein the upper ends of the inner shaft 220 and the outer shaft 210 are respectively connected to the top plate 400. ) and the auxiliary top plate 500 are coupled one by one to the center, and the top plate 400 and the auxiliary top plate 500 may be configured to rotate, respectively.

This will be described in detail through [Fig. 7].

The inner shaft 220 may be configured as a part of the rotating shaft 200 and may be connected to the top plate 400 . When the inner shaft 220 rotates under the control of the control unit (not shown), the top plate 400 coupled thereto may also rotate.

The outer shaft 210 may be configured as a part of the rotation shaft 200 and may be connected to the auxiliary top plate 500 . When the outer shaft 210 rotates under the control of the control unit (not shown), the auxiliary top plate 500 coupled thereto may also rotate.

7 shows an embodiment of a structure for transmitting the rotational force of the motor to the outer shaft 210 and the inner shaft 220 of the rotary shaft 200, and the embodiment will be described in detail below. Of course, the embodiment of [Fig. 7] is an embodiment of the present invention, and the rotation structure of the rotation shaft 200 can be configured in various ways.

Gear units may be formed along outer circumferential surfaces of the motor shafts of the first and second motors 241 and 242 . In addition, gear parts may be formed on the outer circumferential surfaces of the outer shaft 210 and the inner shaft 220 of the rotating shaft 200 to correspond to the gears 243 formed on the motor shafts of the first and second motors 241 and 242, respectively.

The rotational force generated by the first motor 241 is transmitted to the outer shaft 210 through the timing belt 244 connecting the gear unit formed on the motor shaft of the first motor 241 and the gear unit formed on the outer shaft 210 It may be configured to rotate the outer shaft 210 according to.

Similarly, the rotational force generated by the second motor 242 is transmitted to the inner shaft 220 through the timing belt 244 connecting the gear unit formed on the motor shaft of the second motor 242 and the gear unit formed on the inner shaft 220. It may be configured to rotate the inner shaft 220 as it is transmitted.

At this time, the control unit (not shown) adjusts the on/off and rotation speeds of the first motor 241 and the second motor 242 to rotate the top plate 400 and the auxiliary top plate 500 at regular time intervals. can make it

Since the inner shaft 220 is accommodated in the longitudinal conduit 230 formed on the outer shaft 210, the inner shaft 220 is formed in order to form a gear part on the outer circumferential surface of the inner shaft 220 and connect it to the timing belt 244. It may be formed to protrude more than the outer shaft 210. As shown in [FIG. 7], the upper and lower ends of the inner shaft 220 are formed to protrude beyond the outer shaft 210 so that the upper end of the inner shaft 220 is at the center of the top plate 400 or the auxiliary top plate 500. coupled, and a gear portion may be formed at the lower end. However, [Fig. 7] is an embodiment of the present invention, and the lower end of the inner shaft 220 can be configured in various ways, such as extending the shaft and fixing it to the bottom plate 100, and is not limited to the above configuration.

Since the inner shaft 220 and the outer shaft 210 rotate separately, a bearing 245 is installed between the inner shaft 220 and the outer shaft 210 to maintain a constant distance between the inner shaft 220 and the outer shaft 210. It can be configured to maintain and reduce friction to facilitate rotation.

Similarly, in order to smoothly rotate the inner shaft 220 and the outer shaft 210, the inner shaft 220 and the outer shaft 210 and the inner shaft 220 and the outer shaft 210 are fixed to the bottom plate 100 so as to be fixed and rotated. Bearings 245 may be installed between the members, respectively.

The bearing 245 is provided between the inner shaft 220 and the outer shaft 210 and between the bottom plate 100 and the inner shaft 220, and when the inner shaft 220 and the outer shaft 210 rotate and the When the inner shaft 220 is inserted into the bottom plate 100 and rotates, it may be configured to reduce frictional force. By providing the bearing 245 , frictional force between the inner shaft 220 , the outer shaft 210 , and the bottom plate 100 is minimized. In addition, the top plate 400 and the auxiliary top plate 500 rotating with the inner shaft 220 and the outer shaft 210, respectively, have first and second motors whose operation timing is controlled by the control unit (not shown). 241, 242) can rotate according to the operation.

The rotation module 240 is configured to rotate the rotation shaft 200, and may include a motor, a timing belt 244, and the like. In [FIG. 7], the first and second motors 241 and 242, a gear 243, a timing belt 244, and a bearing 245 are shown as an embodiment of the rotation module 240. However, [Figure 7] is an embodiment of the present invention, the configuration of the rotation module 240 is not limited thereto, and may be configured in various ways.

In addition, the rotation module 240 is electrically connected to the control unit (not shown) to perform on/off operation of the motor according to the control of the control unit (not shown).

In addition, a spring 320 provided in the longitudinal direction inside the sample holder 300 and an elastic support part 310 at an upper end of the spring 320 may be further included.

This will be explained in detail through [Fig. 8].

The spring 320 may be provided at an inner lower end of the sample holder 300 . The suction tube 600 is in contact with the top plate 400 or the auxiliary top plate 500 when the top plate 400 or the auxiliary top plate 500 rotates as the rotating shaft 200 rotates. The accuracy of the results can be improved. However, since the respective lengths may be different when the production conditions of the suction tube 600 are different, the length is directly cut for each experiment, or the case 610 of the suction tube is made of a material such as metal. Foundation is not easy. Therefore, when the spring 320 is provided at the inner lower end of the sample holder 300 and the suction tube 600 is inserted and fixed, the spring 320 made of an elastic member holds the suction tube 600 in place. It may come into contact with the top plate 400 or the auxiliary top plate 500.

The elastic support part 310 may be provided inside the sample holder 300 and may be located at an upper end of the spring 320 . When the suction tube 600 is fixed to the top of the spring 320, it may be configured to be stably fixed.

In the above, the present invention was examined in detail with specific examples. However, the present invention is not limited by the above embodiments and can be modified and modified within the scope without departing from the gist of the present invention. Accordingly, the claims of the present invention include such modifications and variations.

10: housing
100: bottom plate
200: axis of rotation
210: outer shaft 220: inner shaft
230: conduit
240: rotation module
241: first motor 242: second motor
243: gear 244: timing belt
245: Bearing
300: sample holder
310: elastic support 320: spring
400: top plate
410: open hole
500: auxiliary top plate
510: auxiliary opening
600: adsorption pipe
610: adsorption tube case 620: adsorption material

Claims (4)

A housing 10 having a circular opening formed on an upper surface thereof;
a bottom plate 100 provided on an inner lower surface of the housing 10;
a rotating shaft 200 installed and erected at the center of the bottom plate 100 and configured to rotate by externally applied power;
a disc-shaped top plate 400 coupled to an upper end of the rotating shaft 200, rotating together with the rotating shaft 200 while sealing the opening, and having an opening 410;
a plurality of sample holders 300 spaced apart from each other at regular intervals on a concentric circle based on the center point of the bottom plate 100; and
A tubular member whose lower end is inserted and fixed into the sample holder 300, whose upper end is in contact with the lower surface of the upper plate 400, and as the upper plate 400 rotates, the upper end of the adsorbent material 620 inserted into the opening A plurality of suction tubes 600 to be exposed to outside air through 410; including,
A passive gas sample evaluation device configured to sequentially communicate with the plurality of adsorption tubes 600 through the openings 410 according to the rotation of the top plate 400.




In paragraph 1,
an auxiliary top plate 500 that is stacked so as to come into close contact with the upper or lower surface of the top plate 400 and has auxiliary openings 510 corresponding to the openings 410 formed on the plate surface; Including more,
In a state in which the auxiliary top plate 500 rotates and the auxiliary open hole 510 communicates with the specific suction tube 600, the top plate 400 rotates and the open hole 410 opens the auxiliary open hole 510. ), so that outside air reaches the top of the adsorption material 620, the passive gas sample evaluation device.
In claim 2, the rotating shaft 200,
an outer shaft 210 having a longitudinal conduit 230; and
an inner shaft 220 inserted into the conduit 230 and formed to protrude more upward than the outer shaft 210; It is configured to further include,
The upper ends of the inner shaft 220 and the outer shaft 210 are coupled to the center of the top plate 400 and the auxiliary top plate 500, respectively, so that the top plate 400 and the auxiliary top plate 500 are configured to rotate, respectively. Passive gas sample evaluation device to be.
In any one of claims 1 to 3,
Passive gas sample evaluation device, characterized in that it is configured to further include; a spring 320 provided in the longitudinal direction inside the sample holder 300 and an elastic support part 310 at the top of the spring 320.

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