Sampling bag cleaning device and sampling bag cleaning method

Abstract

To clean the inside of a sampling bag contaminated by a high concentration volatile substance.SOLUTION: A sampling bag cleaning device includes: cleaning gas supply means; a cleaning gas supply tube that connects the cleaning gas supply means and a sampling bag; and a discharge tube that is connected to the sampling bag and discharges gas from the sampling bag. In the sampling bag cleaning device, the cleaning gas supply tube and the discharge tube constitute a double tube structure using the cleaning gas supply tube as an inner tube and the discharge tube as an outer tube, and at least one hole through which the inside and the outside communicate with each other is formed on the discharge tube that is the outer tube.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sampling bag cleaning device and a method for cleaning a sampling bag using the device. [Background technology]

[0002] Sampling bags are used to collect gases and analyze their components. Sampling bags are also used for special purposes, such as collecting and testing volatile substances emitted from parts such as automobile interior materials (e.g., Patent Document 1), but are mainly used to collect and analyze gases containing volatile substances in the work environment.

[0003] Generally, such sampling bags are expensive, and it is desirable to use them repeatedly. However, once a sampling bag has been used for environmental measurement, the inside of the bag may become contaminated by volatile substances contained in the collected gas. Furthermore, depending on the measurement target, the inside of the sampling bag may become contaminated by a higher concentration of volatile substances. Therefore, in order to reuse a sampling bag that has been used once, its inside must be thoroughly cleaned.

[0004] Sampling bags used for environmental measurement are generally provided with a connection port having a smaller diameter than the connection port of a sampling bag used for measuring volatile substances in automobile parts. Some sampling bags for environmental measurement are provided with two or more connection ports, but most sampling bags for environmental measurement have only one connection port. Therefore, it is generally difficult to clean sampling bags for environmental measurement such as the one disclosed in Patent Document 1 using a technique for cleaning a sampling bag for measuring volatile substances in automobile parts.

[0005] Furthermore, when performing environmental measurement, gas containing a high concentration of volatile substances is sampled in a sampling bag for environmental measurement depending on the environment to be measured. While the concentration of volatile substances contained in a sampling bag before use is small, a sample in environmental measurement may generally contain a much higher concentration of volatile substances than this. Patent Document 1 discloses a method for forcibly evacuating gas supplied to a sampling bag before use using a suction device (such as a pump). However, when a high concentration of volatile substances contained in a sample gas for environmental measurement is sucked in, not only will the inside of the pump be contaminated, but the pump may also break down. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-142082 A Summary of the Invention [Problem to be solved by the invention]

[0007] With the conventional technology, it was difficult to thoroughly clean a sampling bag for environmental measurement that had been used once. In addition, with the conventional technology, there was a risk that the equipment used for cleaning would break down when cleaning a sampling bag for environmental measurement that had been used once. Therefore, a technology that could solve such problems was desired. [Means for solving the problem]

[0008] As a result of intensive research conducted by the present inventors to solve the above-mentioned problems, they discovered that the above-mentioned problems can be solved by an apparatus having a specific structure and a cleaning method using said apparatus, thereby completing the present invention. That is, the present invention provides: [1] A sampling bag cleaning device having a cleaning gas supplying means, a cleaning gas supplying tube connecting the cleaning gas supplying means and a sampling bag, and a discharge tube connected to the sampling bag and discharging gas from the sampling bag, The cleaning gas supply tube and the exhaust tube have a double-tube structure in which the cleaning gas supply tube is an inner tube and the exhaust tube is an outer tube, The discharge tube, which is an outer tube, has a hole that communicates between the inside and the outside. The sampling bag cleaning device, [2] The sampling bag cleaning device according to [1], further comprising an adsorption means for adsorbing volatile substances contained in the gas discharged from the hole; [3] The sampling bag cleaning device according to [2], wherein the suction means is provided so as to surround the area of ​​the discharge tube having the hole. [4] The sampling bag cleaning device according to [3], wherein two or more discharge tubes are inserted into the adsorption means. [5] A sampling bag cleaning device having a cleaning gas supplying means, a cleaning gas supplying tube connecting the cleaning gas supplying means and a sampling bag, and a discharge tube connected to the sampling bag and discharging gas from the sampling bag, The sampling bag cleaning device is characterized in that an ejector is connected to the discharge tube. [6] The sampling bag cleaning device according to [5], wherein the ejector is a gas ejector. [7] A sampling bag cleaning device having a cleaning gas supplying means, a cleaning gas supplying tube connecting the cleaning gas supplying means and a sampling bag, and a discharge tube connected to the sampling bag and discharging gas from the sampling bag, The cleaning gas supply tube and the exhaust tube have a double-tube structure in which the cleaning gas supply tube is an inner tube and the exhaust tube is an outer tube, The discharge tube, which is an outer tube, has a hole that communicates between the inside and the outside of the tube, An ejector is connected to the discharge tube. The sampling bag cleaning device, [8] A method for cleaning a sampling bag using the sampling bag cleaning device according to any one of [1] to [7]. Regarding. Effect of the Invention

[0009] According to the present invention, the sampling bag after collecting volatile substances can be easily washed to a degree that the sampling bag can be reused, and the possibility that the cleaning device itself will be significantly contaminated by the collected volatile substances and cause the device to break down can be further reduced. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2A is a schematic diagram of a sampling bag washing device according to the present invention in a first embodiment, and FIG. 2B is a cross-sectional view taken along line AB in the first embodiment. [Diagram 2] FIG. 4 is a schematic diagram illustrating the flow of cleaning gas in a sampling bag. [Diagram 3] 1 is a diagram of a discharge tube with a valve. [Figure 4] FIG. 2A is a schematic diagram of a sampling bag cleaning device having an adsorption means, FIG. 2B is an enlarged view of the adsorption means, and FIG. 2C is a cross-sectional view taken along the line C-D in FIG. [Diagram 5] FIG. 5(A) is a schematic diagram of an adsorption means having a different form from that in FIG. 4, and FIG. 5(B) is a cross-sectional view taken along line E-F of FIG. [Figure 6] FIG. 1A is a schematic diagram of another embodiment of a sampling bag cleaning device having an adsorption means, (B) is an enlarged view of the adsorption means, and (C) is a GH cross-sectional view of (B). [Figure 7] FIG. 1A is a schematic diagram showing a state in which a plurality of discharge tubes are inserted into the suction means, and FIG. 1B is a cross-sectional view taken along line IJ in FIG. [Figure 8]1 is a diagram for explaining a specific embodiment of a sampling bag cleaning device according to a first embodiment; [Figure 9] FIG. 2 is a schematic diagram illustrating a specific configuration of the sampling bag cleaning device of the first embodiment. [Figure 10] FIG. 2 is a schematic diagram of a sampling bag cleaning device of the present invention in a second embodiment. [Figure 11] FIG. 2 is a schematic diagram of a sampling bag cleaning device of a second embodiment having a silencer. [Figure 12] FIG. 1A is a schematic diagram of a sampling bag cleaning device of a second embodiment in which the periphery of a silencer is covered with an adsorption means, and FIG. 1B is a KL cross-sectional view of (A). [Figure 13] 11 is a diagram for explaining a specific embodiment of the sampling bag cleaning device of the second embodiment. [Figure 14] FIG. 11 is a schematic diagram illustrating a specific configuration of a sampling bag cleaning device of a second embodiment. [Figure 15] FIG. 13 is a schematic diagram of a sampling bag cleaning device according to a third embodiment. [Figure 16] 13 is a diagram for explaining a specific embodiment of the sampling bag cleaning device of the third embodiment. [Figure 17] FIG. 13 is a schematic diagram illustrating a specific configuration of a sampling bag cleaning device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It goes without saying that the present invention is not limited to the following embodiment as it is, and various modifications are possible within the technical scope of the invention described in the claims. In addition, the terms "up and down," "front and back," and "left and right" in the text refer to the directions shown in the drawings corresponding to the description.

[0012] 1.First form One embodiment of the sampling bag cleaning device 1 of the present invention is shown in Fig. 1 (A). The sampling bag cleaning device 1 includes a cleaning gas supply means 2, a cleaning gas supply tube 3 that connects the cleaning gas supply means 2 and a sampling bag X, and a discharge tube 4 that is connected to the sampling bag X and discharges gas from the sampling bag X. The cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure in which the cleaning gas supply tube 3 is an inner tube and the exhaust tube is an outer tube 4. In this cleaning device, the discharge tube 4, which is an outer tube, has at least one hole 41 that connects the inside to the outside.

[0013] The cleaning gas supplying means 2 supplies cleaning gas to the sampling bag X. The cleaning gas supplying means 2 may include a gas supply source such as a cylinder for storing and supplying such cleaning gas, a power source such as a pump, and a control device such as a mass flow controller for controlling the amount of cleaning gas supplied.

[0014] The cleaning gas supply tube 3 is a tube that connects the cleaning gas supply means 2 and the sampling bag X through the connection port X1. The cleaning gas is supplied from the cleaning gas supply means 2 into the sampling bag X through the cleaning gas supply tube 3. The cleaning gas supply tube 3 is preferably a tube molded into a circular tube having flexibility, for example, from fluororesin. The outer diameter of the cleaning gas supply tube 3 is preferably large enough to be inserted into the inside of the sampling bag X through the connection port X1 of the sampling bag X. The specific outer diameter of the cleaning gas supply tube 3 is, for example, 1 to 3 mm, preferably 1 to 2 mm, and more preferably 1 to 1.6 mm. By setting the outer diameter of the cleaning gas supply tube 3 to the above numerical range, the cleaning gas supply tube 3 can be more smoothly inserted into the sampling bag X through the connection port of the sampling bag, for example, a sampling bag for environmental measurement. The specific inner diameter of the cleaning gas supply tube 3 is, for example, 0.5 to 2.5 mm, preferably 0.5 to 1.5 mm, and more preferably 0.5 to 1 mm. By setting the inner diameter of the cleaning gas supply tube 3 within the above-mentioned range, the amount of cleaning gas supplied through the tube can be ensured.

[0015] The discharge tube 4 is connected to the connection port X1 of the sampling bag X and is a tube for discharging the gas in the sampling bag X to the outside of the sampling bag X. The discharge tube 4 is preferably a tube molded into a circular tube having flexibility, for example, from fluororesin. The outer diameter of the discharge tube 4 is not particularly limited. The inner diameter of the discharge tube 4 is not particularly limited, provided that it can contain the cleaning gas supply tube 3 to form a double tube, and can pass the gas discharged from the sampling bag X through the space (space S in FIG. 1(B)) formed by the inner wall of the discharge tube 4 and the outer wall of the cleaning gas supply tube 3. The specific inner diameter of the discharge tube 4 is, for example, 2 to 8 mm, preferably 2 to 4 mm, and more preferably 2 to 3 mm. By setting the inner diameter to the above numerical range, the connection to the connection port X1 of the sampling bag X can be smoothly performed, and the discharge of the gas from the sampling bag X is not excessively hindered.

[0016] The discharge tube 4 has at least one hole 41 that communicates the inside with the outside. As described later, gas in the sampling bag X is discharged to the outside of the discharge tube 4 through the hole 41. The number of holes 41 may be one, or two or more. The position of the hole 41 in the discharge tube 4 is not particularly limited. By separating the position of the hole 41 in the discharge tube 4 from the connection port X1 of the sampling bag X, it is easier to connect the adsorption means 6 to the discharge tube 4 or to surround the discharge tube 4 with the adsorption means 6, which will be described later. The size of the hole 41 is also not particularly limited, provided that it does not excessively hinder the discharge of gas from the sampling bag X. The size of the hole 41 is, for example, 3 to 8 mm when viewed from a planar direction. 2 , preferably 4 to 6 mm 2 , more preferably 3 to 4 mm 2 By setting the size of the holes 41 within the above numerical range, gas can be discharged from the discharge tube 4 more efficiently.

[0017] As described above, the cleaning gas supply tube 3 and the discharge tube 4 have a double-tube structure with the cleaning gas supply tube 3 as an inner tube and the discharge tube 4 as an outer tube (see FIG. 1(B)). By adopting such a double-tube structure, even a sampling bag X having only one connection port X1 can be cleaned more efficiently. As described later, the gas in the sampling bag X flows through a space (space S in FIG. 1(B)) formed by the inner wall of the discharge tube 4 and the outer wall of the cleaning gas supply tube 3, and is discharged to the outside of the discharge tube 4 through the hole 41. Therefore, it is preferable that the ratio of the outer diameter of the cleaning gas supply tube 3 to the inner diameter of the discharge tube 4 is, for example, 1:2, preferably 1:3, and more preferably 1:4 in terms of outer diameter:inner diameter. By setting the ratio of the outer diameter to the inner diameter within the above numerical range, the supply of cleaning gas and the discharge of gas from the sampling bag X can be more balanced. The double-tube structure may be such that the entire cleaning gas supply tube 3 is double-tube structured with the exhaust tube 4, or as shown in Fig. 1(A) , a part of the cleaning gas supply tube 3 is double-tube structured with the exhaust tube 4. Although Fig. 1 shows only one set of double tubes of the cleaning gas supply tube 3 and the exhaust tube 4, two or more sets of double tubes may be provided as necessary, for example, when two or more sampling bags are cleaned at one time.

[0018] It is preferable to provide a cap 42 having a ring structure for covering the exhaust tube 4 while the cleaning gas supply tube 3 passes through it at the end opposite to the end connected to the connection port X1 of the exhaust tube 4. For example, an O-ring or a silicon tube made of an elastic material such as rubber can be used as the cap 42. The cleaning gas supply tube 3 passes through the inner circumference of the cap 42, and the outer circumference of the cleaning gas supply tube 3 elastically contacts the cap 42. Therefore, when the cleaning gas supply tube 3 slides along the connection port X1 of the sampling bag X, the cleaning gas supply tube 3 receives resistance due to this elastic contact, and it is possible to prevent the cleaning gas supply tube 3 from sliding inadvertently. In addition, the cap 42 allows the exhaust gas to be mainly discharged from the hole 41.

[0019] A method for cleaning the sampling bag X using the sampling bag cleaning device 1 will be described. There is no particular limit to the type of sampling bag to be cleaned, but in the present invention, a sampling bag for environmental measurement, particularly a sampling bag after use, can be suitably cleaned. As described above, the discharge tube 4 is connected to the connection port X1 of the sampling bag X using a connection means such as a silicon tube or a rubber tube. For example, in the example of FIG. 1, the connection port X1 of the sampling bag X is inserted into one hole of the silicon tube, and the discharge tube 4 is inserted into the other hole, thereby connecting the sampling bag X and the discharge tube 4. The cleaning gas supply tube 3 connected to the cleaning gas supply means 2 passes through the inside of the discharge tube 4 and is inserted into the inside of the sampling bag X through the connection port X1. The cleaning gas supply tube 3 can be moved in the tube longitudinal direction by sliding the cap 42. Therefore, the length by which the cleaning gas supply tube 3 protrudes from the discharge tube 4 and enters the inside of the sampling bag X can be easily adjusted. The length to be adjusted is desirably approximately the distance from the connection port X1 of the sampling bag X to the corner end of the rectangular sampling bag X farthest from the connection port X1, but it is usually sufficient to adjust the length so that the tip of the cleaning gas supply tube 3 is inserted near the center of the sampling bag X or further inside. In other words, the cleaning gas supply tube 3 may protrude from the discharge tube 4 to a length such that the tip is located at least in the center of the sampling bag X. In this way, the cleaning gas supply tube 3 is used with a sufficient length so that the length can be adjusted to approximately the distance from the connection port X1 to the corner end farthest from sampling bags X of various sizes, and it is preferable to use a cleaning gas supply tube 3 with a dimension longer than the diagonal line of the largest sampling bag X to be used.

[0020] A cleaning gas is supplied from the cleaning gas supply means 2 through a cleaning gas supply tube 3. Although air in the atmosphere can be used as the cleaning gas, it is preferable to use a purified gas that does not contain impurities such as volatile organic compounds (VOCs), for example, nitrogen gas or air with a high purity of 99.999% or more. The cleaning gas is blown into the sampling bag X from the tip of the cleaning gas supply tube 3. Since the tip of the cleaning gas supply tube 3 is inserted deep into the sampling bag X, the cleaning gas is blown into a location far away from the connection port X1 of the sampling bag X. When the cleaning gas is blown deep inside the sampling bag X from the tip of the cleaning gas supply tube 3 in this way, the cleaning gas is sent to the end of the sampling bag X, causing the end of the sampling bag X to swell, and then flows inside the sampling bag X so that the swelled part expands toward the connection port X1 side. That is, as shown by the dotted arrow in FIG. 2, the cleaning gas flows throughout the entire area of ​​the sampling bag X from the end of the back of the sampling bag X toward the connection port X1. When an amount of cleaning gas exceeding the capacity of the sampling bag X is blown in, the excess cleaning gas flows out of the connection port X1 into the discharge tube 4 and is exhausted through the hole 41 formed in the discharge tube 4. By continuously supplying cleaning gas through the cleaning gas supply tube 3, gas is continuously exhausted through the hole 41 of the discharge tube 4, and thus the sampling bag X can be continuously cleaned with the cleaning gas.

[0021] The cleaning time can be adjusted as appropriate depending on the capacity of the sampling bag X and the flow rate of the cleaning gas. For example, in the case of a sampling bag X with a capacity of 10 L, when cleaning is performed with the flow rate of the cleaning gas set to 500 mL / min, cleaning can be completed by passing the cleaning gas through the sampling bag 1 for about 1.5 to 2.5 hours. Furthermore, the flow rate of the cleaning gas supplied to the sampling bag 1 can be adjusted as appropriate depending on the capacity of the sampling bag X.

[0022] The sampling bag cleaning device 1 of the present invention, having the above-mentioned configuration, does not require repeated filling and discharging of cleaning gas, and can efficiently clean even a sampling bag contaminated with a high concentration of volatile substances to a reusable state by simply supplying cleaning gas continuously into the sampling bag X. In addition, by monitoring the amount of volatile substances discharged from the hole 41, the timing to end the cleaning operation can be more easily confirmed. Furthermore, even a sampling bag with only one connection port can be efficiently cleaned.

[0023] The discharge tube 4 may be provided with a valve 5 for opening and closing the discharge tube 4 and / or controlling the opening and closing direction. FIG. 3 shows an example of the configuration of the cleaning gas supply tube 3 and the discharge tube 4 including the valve 5. In FIG. 3, a three-way valve 5 is inserted between the discharge tube 4 that is closed by a cap 42 and extends in the vertical direction. A forced discharge tube 43 is connected to the right side of the three-way valve. The forced discharge tube 43 is connected to an exhaust means such as a pump. When supplying cleaning gas to wash the sampling bag X, the side of the three-way valve 5 to which the forced discharge tube 43 is connected is closed, and the gas discharged from the sampling bag X is discharged to the outside through the hole 41. When the cleaning of the sampling bag X is completed and the gas is forcibly discharged from inside the sampling bag X, the side of the three-way valve 5 to which the forced discharge tube 43 is connected is opened, the forced discharge tube 43 is communicated with the discharge tube 4, and a pump or the like connected to the forced discharge tube 43 is driven. In addition, by increasing the suction speed from the forced discharge tube 43, the effect of pressure loss at the hole 41 can be reduced as much as possible and gas can be discharged from the sampling bag X. The suction speed can be adjusted appropriately according to the size of the hole 41, etc. With this configuration, the sampling bag X can be forcibly deflated after the cleaning of the sampling bag X is completed, thereby making it possible to more quickly perform processing after the cleaning operation is completed.

[0024] The sampling bag cleaning device 1 of the present invention may have an adsorption means for adsorbing volatile substances contained in the gas discharged from the hole 41. FIG. 4 shows a specific example of the sampling bag cleaning device 1 equipped with such an adsorption means 6. As shown in FIG. 4(A)-(C), the adsorption means 6 includes a hollow container 61 and an outlet 62 opened in the container 61, and the container 61 contains an adsorbent 63 for adsorbing volatile substances inside. For example, activated carbon, zeolite, molecular sieve, etc. can be used as the adsorbent 63. There is no particular limitation on the material, shape, and size of the container 61, and it can be appropriately changed depending on the type and amount of the adsorbent contained therein, the type of volatile substances contained in the exhaust gas, etc. The adsorption means 6 is connected to the discharge tube 4 through a tube 64 connected to communicate with the hole 41. An O-ring 65 is provided at the location where the tube 64 and the container 61 contact each other. The tube 64 is passed through the inner circumference of the O-ring 65, and the outer circumference of the tube 64 is in elastic contact with the O-ring 65. The O-ring 65 prevents excessive gas leakage from the gap between the container 61 and the tube 64.

[0025] The gas expelled from the sampling bag X by the cleaning gas as described above is sent to the adsorption means 6 through the hole 41 and the tube 64. The volatile substances contained in the gas are adsorbed by the adsorbent 63 filled in the adsorption means 6, and the gas from which the volatile substances have been removed or whose concentration has been reduced is discharged to the outside through the exhaust port 62. With this configuration, even when cleaning a sampling bag contaminated with a high concentration of volatile substances, the work environment for cleaning can be worked on more safely without excessively polluting the work environment.

[0026] As described above, the adsorption means 6 may be filled with the adsorbent 63, or the exhaust port 62 may be provided with an adsorption filter without being filled with the adsorbent. FIG. 5 shows a form in which the exhaust port 62 of the adsorption means 6 is provided with an adsorption filter 66. As shown in FIG. 5(A), the exhaust port 62 of the adsorption means 6 may be provided with an adsorption filter 66, and a hole other than the exhaust port may be opened and an intake fan 67 may be provided in the hole. By driving the intake fan 67, outside air is supplied into the container 61 of the adsorption means 6. The exhaust gas discharged into the container 61 through the tube 64 is pushed out to the exhaust port 62 by the supplied outside air. The exhaust port 62 is provided with the adsorption filter 66, and the volatile substances contained in the exhaust gas are adsorbed by the adsorption filter 66, and the gas from which the volatile substances have been removed or the concentration of the volatile substances has been reduced is discharged to the outside of the adsorption means 6. There is no particular limitation on the adsorption substance contained in the adsorption filter 66, and the adsorbent as described above can be suitably used. 5, the use of the adsorption filter 66 makes maintenance easier than when the adsorbent 63 is packed inside the container 61. Note that it is also possible to provide an exhaust fan equipped with an adsorption filter at the exhaust port 62 instead of or in addition to the intake fan.

[0027] As another embodiment in which the adsorption means 6 is provided, the adsorption means 6 may be provided so as to surround the region of the discharge tube 4 having the hole 41, as shown in FIG. 6(A). FIG. 6(B) is an enlarged view of a part of the discharge tube 4 surrounded by the adsorption means 6. As shown in FIG. 6(B), the discharge tube 4 penetrates the container 61 of the adsorption means 6, and the part having the hole 41 and the surrounding area are housed inside the adsorption means 6. O-rings 65, 65 are provided at the part where the discharge tube 4 and the outer wall of the adsorption means 6 come into contact. The discharge tube 4 passes through the inner circumference of the O-rings 65, 65, and the outer circumference of the discharge tube 4 elastically contacts the O-rings 65, 65. The O-rings 65, 65 prevent excessive gas leakage from the gap between the container 61 and the discharge tube 4. The inside of the adsorption means 6 is filled with an adsorbent 63, and the adsorbent 63 surrounds the discharge tube 4 that is inserted into the inside of the adsorption means 6. If the gas discharged from the hole 41 contains volatile substances, the volatile substances are adsorbed by the adsorbent surrounding the discharge tube 4, and the gas from which the volatile substances have been removed or from which the concentration has been reduced is discharged to the outside through the discharge port 62. By using the discharge tube 4 in combination with the adsorption means 6 as described above, it becomes unnecessary to use the tube 64, so that the configuration of the sampling bag cleaning device can be further simplified and the device can be made more compact.

[0028] In addition, two or more discharge tubes 4 may be inserted into the adsorption means 6. FIG. 7 shows a form in which two or more discharge tubes 4 are inserted into the adsorption means 6 shown in FIG. 5. As shown in FIG. 7(A), two or more discharge tubes 4 are inserted into the container 61 of the adsorption means 6. The area including the hole 41 in each discharge tube 4 is housed inside the container 61 of the adsorption means 6. The adsorption means 6 is provided with an intake fan 67 and an adsorption filter 66 provided at the exhaust port 62. By adopting such a form, the number of sampling bags that can be washed at one time can be significantly increased. Specifically, for example, in the example of FIG. 7, the number of sampling bags corresponding to the number of six discharge tubes 4 inserted into the adsorption means 6 can be washed at one time. By increasing the number of adsorption means 6 as shown in FIG. 7 in the sampling bag washing device 1, even more sampling bags can be washed at one time. In addition, by adopting the form as shown in FIG. 7, the volatile substances contained in the gas discharged from two or more discharge tubes 4 can be collected by a single adsorption means 6, so that the structure of the washing device can be made simpler and the size of the washing device can be made smaller.

[0029] 8 shows a more specific embodiment of the sampling bag cleaning device 1 of the first embodiment. Reference numeral 11 denotes a housing of the sampling bag cleaning device 1, in which a main pipe, an on-off valve, a control unit, etc. are built, and a gas cylinder, etc. can be connected to the main pipe. The housing 11 is provided with a start switch 121, a stop switch 122, a timer 123, etc., which are included in the control unit described later.

[0030] Fig. 9 is a diagram showing a more specific configuration of the sampling bag cleaning device of the present invention. For convenience of explanation, the cleaning gas supply tube 3 and the exhaust tube 4 are shown as separate tubes in Fig. 9, but in reality, the cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure as shown in Fig. 1. Specifically, the cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure up to a point where the valve 5 is provided in the exhaust tube 4. A main pipe 13 is connected to a cleaning gas supplying means 2 such as a gas cylinder (not shown) provided externally. The main pipe 13 is provided with an opening / closing valve 14 and a pressure gauge 15. The cleaning gas supply tube 3 is connected to the main pipe 13, and the cleaning gas supply tube 3 is inserted into the sampling bag X as described above.

[0031] The discharge tube 4 is inserted into the housing 11, and the part including the hole 41 is also inserted into the housing 11. The discharge tube 4 is provided with an adsorption means 6 and a valve 5 as necessary. The forced discharge tube 43 is connected to the valve 5, and the forced discharge tube 43 is connected to an integrating flow meter 16 and a suction device 17 such as a pump. The valve 5 is "closed" and the opening / closing valve 14 of the main pipe 13 is "opened", so that the cleaning gas is supplied to the sampling bag X. As described above, when the supply amount of the cleaning gas exceeds the capacity of the sampling bag X, the excess volume flows into the discharge tube 4 and is discharged from the hole 41 opened in the discharge tube 4. In FIG. 9, the area including the hole 41 in the discharge tube 4 is surrounded by the adsorption means 6, and the volatile substances contained in the gas discharged from the hole 41 are adsorbed by the adsorption means 6, and the gas after the volatile substances are removed or the concentration thereof is reduced is discharged outside the device.

[0032] When the gas is to be forcibly discharged from the sampling bag X after the cleaning of the sampling bag X is completed, the on-off valve 14 is "closed" and the valve 5 is "opened", and the suction device 17 is driven to discharge the gas to the outside. When the amount of gas corresponding to the capacity of the sampling bag X is sucked in by the integrating flow meter 16, the suction device 17 is stopped. The control unit 12 is provided inside the housing 11. The control unit 12 is provided with a start switch 121, a stop switch 122, a timer 123, and the like. The on-off valve 14, the pressure gauge 15, the valve 5, the integrating flow meter 16, and the suction device 17 are connected to the control unit 12. The amount of cleaning gas supplied to the cleaning gas supply tube 3 and the amount of gas discharged from the forced discharge tube 43, and the like are controlled by the control unit 12. In addition, by operating the control unit 12, for example, the timer 123 is operated to set the cleaning time, and the on-off valve 14 is closed at the set time, so that the cleaning operation can be automatically controlled.

[0033] 2.Second form Another embodiment of the sampling bag cleaning device 1 of the present invention is shown in Fig. 10. The sampling bag cleaning device 1 of this embodiment has a cleaning gas supply means 2, a cleaning gas supply tube 3 that connects the cleaning gas supply means 2 and the sampling bag X, and a discharge tube 4 that is connected to the sampling bag X and discharges gas from the sampling bag X, In this cleaning device, an ejector 7 is connected to the discharge tube 4. In the second embodiment, the cleaning gas supply means 2 is the same as in the first embodiment unless otherwise specified. In addition, the cleaning gas supply tube 3 and the discharge tube 4 are the same as in the first embodiment except that they do not have a double-pipe structure unless otherwise specified.

[0034] In the example of FIG. 10, the cleaning gas supply tube 3 is connected to the connection port X1 of the sampling bag X, and the discharge tube 4 is connected to the connection port X2 of the sampling bag X. The connection port X1 is capped with an O-ring 31, the cleaning gas supply tube 3 is passed through the inner circumference of the O-ring 31, and the outer circumference of the cleaning gas supply tube 3 is in elastic contact with the O-ring 31. Therefore, when the cleaning gas supply tube 3 is slid along the connection port X1, it receives resistance due to this elastic contact, and it is possible to prevent the cleaning gas supply tube 3 from sliding inadvertently. In addition, the O-ring 31 can prevent excessive leakage of gas from the connection port X1. The discharge tube 4 is connected to a suction port 71 of an ejector 7 at an end opposite to the side connected to the connection port X2. Tubes 74 and 75 are connected to the primary side 72 and secondary side 73 of the ejector 7, respectively. A fluid supply means 76 such as a pump or a gas cylinder is connected to an end of the tube 74 opposite to the side connected to the primary side 72. The ejector 7 can be used without any particular limitation as long as it can suck gas from the suction port 71 by supplying fluid from the primary side 72 to the secondary side 73. For example, model number ZH07DLA manufactured by SMC Corporation can be suitably used.

[0035] A cleaning gas is supplied from the cleaning gas supply means 2 through the cleaning gas supply tube 3. The cleaning gas is blown into the sampling bag X from the tip of the cleaning gas supply tube 3. When it is necessary to forcibly discharge the gas supplied into the sampling bag X, the fluid supply means 76 is driven to flow a fluid, which is a liquid or gas, from the primary side 72 to the secondary side 73, thereby generating a suction pressure at the suction port 71. The gas in the sampling bag X is sucked into the suction port 71 of the ejector 7 through the discharge tube 4, and is discharged together with the fluid to the outside of the sampling bag X through the secondary side 73 and the tube 75. By using such an ejector 7, the ejector 7 is not excessively contaminated even when a high concentration of volatile substances is contained in the sampling bag X, so that the possibility of contamination or damage can be further reduced compared to the case where a pump is used. In addition, compared to the case where a mechanical mechanism such as a pump is used, the ejector 7 occupies a smaller area in the sampling bag cleaning device 1, and the sampling bag cleaning device can be made smaller. Although only one set of the cleaning gas supply tube 3, exhaust tube 4 and ejector 7 is shown in FIG. 10, two or more sets of these may be provided if necessary, for example, when two or more sampling bags are to be cleaned at one time.

[0036] The cleaning of the sampling bag X using the sampling bag cleaning device 1 of the second embodiment is performed as follows. Cleaning gas is supplied from the cleaning gas supply means 2 through the cleaning gas supply tube 3. The cleaning gas is blown into the sampling bag X from the tip of the cleaning gas supply tube 3. Since the tip of the cleaning gas supply tube 3 is inserted deeply into the sampling bag X, the cleaning gas is blown into a location far away from the connection port X1 of the sampling bag X. After a sufficient amount of cleaning gas is supplied to the sampling bag X, in other words, an amount sufficient to inflate the sampling bag X without bursting the sampling bag X, the supply of the cleaning gas is stopped. Immediately after the supply is stopped or after a predetermined time (for example, one to several minutes) has elapsed, a fluid is supplied to the ejector 7 to generate a suction pressure, and the gas in the sampling bag X is sucked through the suction port 71 of the ejector 7. The suction pressure can be appropriately adjusted according to the capacity of the sampling bag X, etc. After the cleaning gas supplied into the sampling bag is removed, the cleaning gas is supplied again as necessary to repeat the above operation. By repeating such an operation, the inside of the sampling bag X can be cleaned to a cleaner state by a batch-type cleaning method.

[0037] In addition, when the ejector 7 is used, it is more preferable to use a gas as the fluid. Therefore, it is more preferable to use a gas ejector as the ejector 7. When a liquid is used as the fluid, the liquid containing the volatile substance contained in the sampling bag X is discharged from the secondary side 73, and a tank or the like is required to store the discharged liquid. On the other hand, by using a gas as the fluid, such a storage container such as a tank is not required, and the sampling bag cleaning device 1 can be made smaller. In addition, when a gas cylinder is used as the fluid supply source, the fluid can be supplied by utilizing the pressure of the gas cylinder, and the fluid can be supplied without using a mechanical mechanism such as a pump, so that the sampling bag cleaning device can be made smaller. In addition, for example, air can be used as the gas. It is also possible to use a cleaning gas as the fluid.

[0038] Furthermore, when a gas ejector is used as the ejector 7, a silencer 8 may be connected to the gas discharge side of the ejector, i.e., the secondary side 73 of the ejector 7. FIG. 11 illustrates a form in which a silencer 8 is connected to a tube 75 in the sampling bag cleaning device 1 of FIG. 10. By connecting such a silencer 8, it is possible to suppress noise generated when gas is discharged from the ejector 7. Such a silencer 8 can be used without any particular restrictions as long as it can suppress the noise of the gas ejector. As an example of such a silencer 8, there is the AN series of resin silencers manufactured by SMC Corporation.

[0039] Also, the secondary side 73 of the ejector 7 may be provided with an adsorption means 9. By providing such an adsorption means 9, the volatile substances discharged together with the fluid from the secondary side 73 can be adsorbed, and the volatile substances can be removed or their concentration can be reduced before the gas is discharged outside the device, making it possible to work more safely without excessively polluting the work environment. The adsorption means 9 can be one having a configuration similar to that of the adsorption means 6. In addition, when using a silencer 8 as described above, it is more preferable to cover the silencer 8 with the adsorption means 9. For example, as shown in FIG. 12, the silencer 8 may be housed inside the adsorption means 9 including a hollow container 91 containing an adsorbent 93. The adsorption means 9 can be one having a configuration similar to that of the adsorption means 6, without any particular restrictions. The volatile substances contained in the gas discharged from the silencer 8 are adsorbed by the adsorbent 93 in the adsorption means 9, and the gas from which the volatile substances have been removed or whose concentration has been reduced is discharged from the discharge port 92.

[0040] 13 shows a more specific embodiment of the sampling bag cleaning device 1 of the second embodiment. Reference numeral 11 denotes a housing of the sampling bag cleaning device 1, in which a main pipe, an on-off valve, a control unit, etc. are built, and a gas cylinder, etc. can be connected to the gas pipe. The housing 11 is provided with a start switch 121, a stop switch 122, a timer 123, a timer 124, etc., which are included in the control unit 12 described later.

[0041] 14 is a diagram showing a specific configuration of the sampling bag cleaning device 1 of the second embodiment. A main pipe 13 is connected to cleaning gas supply means 2 such as a gas cylinder (not shown) provided externally. An on-off valve 143 and a pressure gauge 153 are connected to the main pipe 13. The main pipe 13 is branched into a cleaning gas supply pipe 131 and a fluid supply pipe 132 midway, and these pipes are provided with an on-off valve 141, a pressure gauge 151, an integrating flow meter 161, an on-off valve 142, and a pressure gauge 152. A cleaning gas supply tube 3 is connected to the cleaning gas supply pipe 131, and the cleaning gas supply tube 3 is inserted into the sampling bag X via the connection port X1 as described above.

[0042] The fluid supply pipe 132 is connected to the primary side 72 of the ejector 7, and a tube 75 is connected to the secondary side 73. An integrating flow meter 162 and the adsorption means 9 are connected to the tube 75. The discharge tube 4 is connected to the suction port 71 of the ejector 7.

[0043] The on-off valves 141, 142, and 143, the pressure gauges 151, 152, and 153, and the integrating flow meters 161 and 162 are connected to the control unit 12, which controls the amount of gas supplied to the cleaning gas supply pipe 131 and the fluid supply pipe 132, and the amount of gas discharged using the ejector 7. The control unit 12 is provided with a start switch 121, a stop switch 122, a timer 123, and a timer 124, etc. By operating the control unit 12, for example, the timers 123 and 124 are operated to set a cleaning time, and the on-off valves 141 and 142 are opened and closed at a set time, thereby automatically controlling the cleaning operation.

[0044] When the on-off valve 143 of the main pipe 13 is open, the on-off valve 141 of the cleaning gas supply pipe 131 is "open" and the on-off valve 142 of the fluid supply pipe 132 is "closed", the cleaning gas is supplied from the cleaning gas supply tube 3 to the sampling bag X. Next, when the on-off valve 141 is "closed" and the on-off valve 142 is "open", the fluid is supplied to the ejector 7. Therefore, the supply of the cleaning gas from the cleaning gas supply tube 3 to the sampling bag X is stopped, and the cleaning gas in the sampling bag X is sucked together with the volatile substances contained in the sampling bag X by the suction force of the ejector 7 and discharged outside the device through the tube 75 and the adsorption means 9. Since the cleaning gas in the sampling bag X can be sucked and forcibly discharged in this way, the cleaning gas can be discharged from the sampling bag X in a short time even if the sampling bag X has a large capacity.

[0045] When the entire amount of cleaning gas inside the sampling bag X is discharged, the on-off valve 142 is "closed" and the operation of the ejector 7 is stopped, but this stopping control is performed in response to a signal output from the integrating flow meter 162 to the control unit 12. That is, the amount of cleaning gas discharged from the sampling bag X is measured by the integrating flow meter 162, but the amount of exhaust gas passing through the tube 75 is measured and integrated by the integrating flow meter 162, and the ejector 7 is controlled to stop when the integrated amount reaches the capacity of the sampling bag X.

[0046] 3.Third form The third embodiment of the sampling bag cleaning device 1 of the present invention is a combination of the first and second embodiments. That is, the third embodiment is a sampling bag cleaning device 1 having a cleaning gas supply means 2, a cleaning gas supply tube 3 that connects the cleaning gas supply means 2 and the sampling bag X, and a discharge tube 4 that is connected to the sampling bag X and discharges gas from the sampling bag X, The cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure in which the cleaning gas supply tube 3 is an inner tube and the exhaust tube 4 is an outer tube, The discharge tube 4, which is an outer tube, has at least one hole 41 that communicates between the inside and the outside of the tube. An ejector 7 is connected to the discharge tube 4. The sampling bag cleaning device is characterized in that

[0047] A specific configuration of the sampling bag cleaning device 1 of the third embodiment is shown in FIG. 15. The sampling bag X in the third embodiment is provided with only one connection port X1. The cleaning gas supply means 2, the cleaning gas supply tube 3, the discharge tube 4, and the ejector 7 are the same as those in the first and second embodiments unless otherwise described. In the third embodiment, even if the sampling bag has only one connection port, cleaning gas can be continuously supplied to clean it. In addition, even if gas is forcibly removed from the sampling bag X by the ejector 7, the ejector 7 is unlikely to be damaged, so it can be used repeatedly. Note that the device may have two or more sets of double pipes, may include a valve 5, may be provided with an adsorption means 6, may use a gas ejector as the ejector 7, may have two or more sets of ejectors, may be provided with a silencer 8 on the ejector 7, and may be provided with an adsorption means 9, which are the same as those in the first and second embodiments.

[0048] Since the sampling bag cleaning device of the third embodiment has the above-mentioned configuration, even when cleaning a sampling bag contaminated with a high concentration of volatile substances, the work environment for cleaning can be cleaned more safely without excessively contaminating the cleaning work environment. In addition, even if a high concentration of volatile substances is contained in the sampling bag X, the ejector 7 is not excessively contaminated, so the possibility of damage can be reduced compared to when a pump is used. Furthermore, compared to when a mechanical mechanism such as a pump is used, the ejector 7 occupies a smaller area in the sampling bag cleaning device 1, making it possible to make the sampling bag cleaning device more compact. In addition, since a single device can easily switch between continuous cleaning and batch cleaning, the cleaning conditions can be changed very easily depending on the type of sampling bag used and the type and concentration of volatile substances contained in the sampling bag.

[0049] 16 shows a more specific embodiment of the sampling bag cleaning device 1 of the third embodiment. Reference numeral 11 denotes a housing of the sampling bag cleaning device 1, in which a main pipe, an on-off valve, a control unit, etc. are built, and a gas cylinder, etc. can be connected to the gas pipe. The housing 11 is provided with a start switch 121, a stop switch 122, a timer 123, a timer 124, etc., which are included in the control unit 12 described later.

[0050] FIG. 17 is a diagram showing a specific configuration of the sampling bag cleaning device 1 of the third embodiment. For convenience of explanation, the cleaning gas supply tube 3 and the exhaust tube 4 are shown as separate tubes in FIG. 17, but in reality, the cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure as shown in FIG. 15. Specifically, the cleaning gas supply tube 3 and the exhaust tube 4 have a double-tube structure up to a point where the valve 5 is provided in the exhaust tube 4. The main pipe 13 is connected to a cleaning gas supply means 2 such as a gas cylinder (not shown) provided outside. An opening / closing valve 143 and a pressure gauge 153 are connected to the main pipe 13. The main pipe 13 is divided into a cleaning gas supply pipe 131 and a fluid supply pipe 132 in the middle, and these pipes are provided with an opening / closing valve 141, a pressure gauge 151, an integrating flow meter 161, an opening / closing valve 142, and a pressure gauge 152. The cleaning gas supply tube 3 is connected to the cleaning gas supply pipe 131, and the cleaning gas supply tube 3 is inserted into the sampling bag X through the connection port X1 as described above.

[0051] The fluid supply pipe 132 is connected to the primary side 72 of the ejector, and a tube 75 is connected to the secondary side 73. An integrating flow meter 162 and an adsorption means 9 are connected to the tube 75. The discharge tube 4 is provided with a valve 5. A forced discharge tube 43 is connected to the valve 5, and the forced discharge tube 43 is connected to a suction port 71 of the ejector 7. An adsorption means 6 surrounds the area of ​​the discharge tube 4 including the hole 41.

[0052] The valve 5, the on-off valves 141, 142, and 143, the pressure gauges 151, 152, and 153, and the integrating flow meters 161 and 162 are connected to the control unit 12, which controls the amount of gas supplied to the cleaning gas supply pipe 131 and the fluid supply pipe 132, and the amount of gas discharged using the ejector 7. The control unit 12 is provided with a start switch 121, a stop switch 122, a timer 123, and a timer 124, etc. By operating the control unit 12, for example, the timers 123 and 124 are operated to set a cleaning time, and the on-off valves 141 and 142 are opened and closed at a set time, thereby automatically controlling the cleaning operation.

[0053] When the on-off valve 143 of the main pipe 13 is open, the on-off valve 141 of the cleaning gas supply pipe 131 is "open", the valve 5 is "closed", and the on-off valve 142 of the fluid supply pipe 132 is "closed", cleaning gas is supplied from the cleaning gas supply tube 3 to the sampling bag X. When cleaning gas is supplied in an amount exceeding the capacity of the sampling bag X, the excess gas is discharged outside the apparatus via the discharge tube 4, the hole 41, and the adsorption means 6. Volatile substances contained in the gas discharged by the adsorption means 6 are removed or their concentration is reduced, thereby reducing the risk of excessive contamination of the working environment.

[0054] Next, when the on-off valve 143 of the main pipe 13 is open, the on-off valve 141 is "closed", the valve 5 is "open", and the on-off valve 142 is "open", the fluid is supplied to the ejector 7. Therefore, the supply of the cleaning gas from the cleaning gas supply tube 3 to the sampling bag X is stopped, and the cleaning gas in the sampling bag X is sucked in by the suction force of the ejector 7 together with the volatile substances contained in the sampling bag, and is discharged outside the device through the tube 75 and the adsorption means 9. Since the cleaning gas in the sampling bag X can be sucked in and forcibly discharged in this way, the cleaning gas can be discharged in a short time even if the sampling bag X has a large capacity. When continuous cleaning is performed, the sampling bag can be deflated by the above operation. When batch cleaning is performed, the supply of the cleaning gas and the above discharge operation can be repeated.

[0055] When the entire amount of cleaning gas inside the sampling bag X is discharged, the on-off valve 142 is turned "closed" and the operation of the ejector 7 is stopped, but this stopping control is performed in response to a signal output from the integrating flow meter 162 to the control unit 12. That is, the amount of cleaning gas discharged from the sampling bag X is measured by the integrating flow meter 162, and the amount of cleaning gas passing through the tube 75 is measured and integrated by the integrating flow meter 162, and the ejector 7 is controlled to stop when the integrated amount reaches the capacity of the sampling bag X. [Industrial Applicability]

[0056] The sampling bag cleaning device and cleaning method of the present invention make it possible to clean sampling bags used in environmental measurements to the extent that they can be reused more easily. This eliminates the need to frequently purchase expensive sampling bags, reducing the cost of environmental measurements and making environmental measurements easier and cheaper to perform. [Explanation of symbols]

[0057] 1: Sampling bag cleaning device, 11: Housing, 12: Control unit, 121: Start switch, 122: Stop switch, 123: Timer, 124: Timer, 13: Main pipe, 131: Cleaning gas supply pipe, 132: Fluid supply pipe, 14: Opening and closing valve, 15: Pressure gauge, 16: Integrating flow meter, 17: Suction device 2: Cleaning gas supply means 3: Cleaning gas supply tube, 31: O-ring 4: discharge tube, 41: hole, 42: cap, 43: forced discharge tube, 5: Valve 6: adsorption means, 61: container, 62: outlet, 63: adsorbent, 64: tube, 65: O-ring, 66: adsorption filter, 67: intake fan 7: ejector, 71: suction port, 72: primary side, 73: secondary side, 74: tube, 75: tube, 76: fluid supply means 8: Silencer 9: adsorption means, 91: container, 92: outlet, 93: adsorbent X: Sampling bag, X1: Connection port, X2: Connection port

Claims

1. A sampling bag cleaning device comprising: a cleaning gas supplying means; a cleaning gas supplying tube connecting the cleaning gas supplying means and a sampling bag; and a discharge tube connected to the sampling bag and discharging gas from the sampling bag, The cleaning gas supply tube and the exhaust tube have a double-tube structure in which the cleaning gas supply tube is an inner tube and the exhaust tube is an outer tube, The discharge tube, which is an outer tube, has a hole that communicates between the inside and the outside of the tube, The device further includes an adsorption means for adsorbing volatile substances contained in the gas discharged from the hole, the adsorption means being provided so as to surround the region of the discharge tube having the hole. The sampling bag cleaning device.

2. 2. The sampling bag cleaning device according to claim 1, wherein two or more discharge tubes are inserted into the suction means.

3. A sampling bag cleaning device comprising: a cleaning gas supplying means; a cleaning gas supplying tube connecting the cleaning gas supplying means and a sampling bag; and a discharge tube connected to the sampling bag and discharging gas from the sampling bag, The cleaning gas supply tube and the exhaust tube have a double-tube structure in which the cleaning gas supply tube is an inner tube and the exhaust tube is an outer tube, The exhaust tube, which is an outer tube, has a hole that communicates between the inside and the outside, and has an adsorption means that adsorbs volatile substances contained in the gas exhausted from the hole, and the adsorption means is provided so as to surround the region of the exhaust tube having the hole, An ejector is connected to the discharge tube. The sampling bag cleaning device.

4. A method for cleaning a sampling bag using the sampling bag cleaning device according to any one of claims 1 to 3.

Images