Gas concentration detecting device

Abstract

This gas concentration detecting device (10) comprises a housing (20), a box body (30), an atomizer (40), a pump (50), and a component measuring sensor (61). The housing (20) has a first internal space (200). The box body (30) is disposed in the first internal space (200). The box body (30) has a second internal space (300) into which liquid flows from the outside of the housing (20) and from which liquid flows out to the outside of the housing (20). The box body (30) has, above the liquid surface of the liquid that has flowed into the second internal space (300), a gas accommodation space in which gas can be accommodated. The atomizer (40) is disposed on the bottom surface of the box body (30) and atomizes the liquid in the second internal space (300). The pump (50) includes a suction port (501) and a discharge port (502), and the suction port (501) communicates with the gas accommodation space in the second internal space (300). The component measuring sensor (61) includes a gas input port (611) and a gas output port (612), the gas input port (611) communicates with the discharge port (502) of the pump (50), the gas output port (612) communicates with the gas accommodation space, and said sensor measures the concentration of a detection target component contained in the gas.

Description

Gas concentration detector

[0001] The present invention relates to a technique for detecting the gas concentration of a target component in water.

[0002] Conventionally, devices for measuring dissolved gases in water have been used for a variety of purposes. For example, devices for measuring dissolved CO2 in water are used to measure the acidity of seawater, measure the amount of CO2 absorbed in seaweed beds, manage the CO2 concentration in the culture medium during algae cultivation, detect leaks in CO2 fixation (CCS) on the seabed, and conduct environmental surveys of lakes, etc.

[0003] As such devices for measuring gas concentrations in water, the following various devices have been disclosed.

[0004] Patent Document 1 discloses an apparatus for measuring the concentration of carbon dioxide dissolved in seawater.

[0005] Patent Document 2 discloses a carbon amount measuring device that measures the amount of carbon contained in sample water.

[0006] Patent Document 3 discloses an analytical device for analyzing dissolved components contained in a liquid sample.

[0007] Special Publication No. 8-505218 Publication No. 2-141661 Publication No. 2003-57153

[0008] However, in conventional devices, it takes a long time for the gas concentration in the water and the gas concentration in the air (internal space of the housing) to reach equilibrium, which means that it takes a long time before measurement can begin.In addition, conventional devices are large in size.

[0009] Therefore, an object of the present invention is to provide a gas concentration detection device that can shorten the time it takes for the gas concentration (concentration of the component to be detected) to reach equilibrium between water and air, and that can prevent the device from becoming too large.

[0010] A gas concentration detection device according to one embodiment of the present invention includes a housing, a box, an atomizer, a pump, and a component measurement sensor. The housing has a first internal space. The box is disposed in the first internal space. The box has a second internal space into which liquid flows in from outside the housing and from which liquid flows out to the outside of the housing. The box has a gas storage space capable of storing gas above the liquid level of the inflowing liquid in the second internal space. The atomizer is disposed on the bottom surface of the box and atomizes the liquid in the second internal space. The pump has an intake port and an outlet port, and the intake port is connected to the gas storage space in the second internal space. The component measurement sensor has a gas inlet port and a gas outlet port, and the gas inlet port is connected to the outlet port of the pump and the gas output port is connected to the gas storage space, and measures the concentration of a detection target component contained in the gas.

[0011] In this configuration, a liquid containing a target component (target gas) is atomized by an atomizer. The atomized liquid particles (atomized particles) contain the target component. When the atomized particles are released into the gas in the gas storage space, the target component is exchanged between the atomized particles and the gas so that the concentration of the target component becomes the same (to achieve gas-liquid equilibrium).

[0012] The atomized particles have a small diameter, so the number of atomized particles per unit volume can be increased. This increases the total contact area between the atomized particles and the gas per unit volume, and therefore shortens the time required to reach gas-liquid equilibrium.

[0013] Furthermore, in this configuration, since it is only necessary to provide an atomizer and a pump for transporting gas, the size of the gas concentration detection device is prevented from increasing.

[0014] According to this invention, it is possible to shorten the time until the concentrations of the detection target component in the water and in the gas reach equilibrium, and also to prevent the device from becoming large.

[0015] FIG. 1A is an external perspective view showing an example of a gas concentration detection device according to a first embodiment, and FIG. 1B is a plan sectional view of the gas concentration detection device according to the first embodiment. FIG. 2 is a functional block diagram showing an example of a gas concentration detection device according to the first embodiment. FIG. 3 is a functional block diagram showing an example of a gas concentration detection device according to a second embodiment. FIG. 4 is a functional block diagram showing an example of a gas concentration detection device according to a third embodiment. FIG. 5 is a functional block diagram showing an example of a gas concentration detection device according to a fourth embodiment. FIG. 6 is a plan sectional view of a gas concentration detection device according to a fifth embodiment. FIG. 7 is a functional block diagram showing an example of a gas concentration detection device according to a sixth embodiment. FIG. 8 is a functional block diagram showing an example of a gas concentration detection device according to a seventh embodiment. FIG. 9 is a sectional view showing an example of the external shape of a gas concentration detection device according to an eighth embodiment. FIG. 10 is a plan sectional view of a gas concentration detection device according to a ninth embodiment. FIG. 11 is a functional block diagram showing an example of a gas concentration detection device according to a tenth embodiment.

[0016] First Embodiment A gas concentration detection device according to a first embodiment of the present invention will be described with reference to the drawings.

[0017] FIG. 1(A) is an external perspective view showing an example of a gas concentration detection device according to a first embodiment, and FIG. 1(B) is a plan cross-sectional view of the gas concentration detection device according to the first embodiment. FIG. 1(B) is a cross-sectional view taken along a plane perpendicular to the side wall of the housing, showing the position where a communication hole is formed. FIG. 2 is a functional block diagram showing an example of a gas concentration detection device according to the first embodiment. Note that in the figures of the following embodiments, including FIG. 2, the size of the atomized particles MST and the size of the detection target component (detection target gas) are shown as being the same, but this is for ease of viewing the figures and does not reflect the actual size relationship. In reality, the detection target component is smaller than the atomized particles MST.

[0018] As shown in Figures 1(A), 1(B), and 2, the gas concentration detection device 10 includes a housing 20, a box 30, an atomizer 40, a pump 50, a component measurement sensor 61, a communication path 711, a communication path 712, a communication path 720, and a power source PM.

[0019] The housing 20 includes a housing side wall 21, a housing top wall 22, and a housing bottom wall 23. The housing side wall 21 is cylindrical, and the housing top wall 22 and the housing bottom wall 23 are each disks.

[0020] The housing top wall 22 is disposed in one of the openings of the housing side wall 21 and is fixed to the housing side wall 21 so as to close the one opening. The housing bottom wall 23 is disposed in the other of the openings of the housing side wall 21 and is fixed to the housing side wall 21 so as to close the other opening. As a result, the housing 20 has a first internal space 200 surrounded by the housing side wall 21, the housing top wall 22, and the housing bottom wall 23.

[0021] The box 30 includes a box side wall 31, a box top wall 32, and a box bottom wall 33. The box side wall 31 is a cylinder, and the box top wall 32 and the box bottom wall 33 are each a disk.

[0022] The box top wall 32 is disposed at one opening of the box side wall 31 and is fixed to the box side wall 31 so as to close the one opening. The box bottom wall 33 is disposed at the other opening of the box side wall 31 and is fixed to the box side wall 31 so as to close the other opening. As a result, the box 30 has a second internal space 300 surrounded by the box side wall 31, the box top wall 32, and the box bottom wall 33.

[0023] The box 30 is smaller than the housing 20. The box 30 is disposed in the first internal space 200 of the housing 20. The box side wall 31 is adjacent to and parallel to the housing side wall 21. The box top wall 32 is parallel to the housing top wall 22, and the box bottom wall 33 is parallel to the housing bottom wall 23.

[0024] The housing 20 and the box 30 have a first communication hole 201 and a second communication hole 202. The first communication hole 201 and the second communication hole 202 communicate the second internal space 300 with the outside of the housing 20.

[0025] The first communication hole 201 and the second communication hole 202 are provided at positions opposite to each other in the housing side wall 21. The first flow path cross-sectional area of ​​the first communication hole 201 and the second flow path cross-sectional area of ​​the second communication hole 202 are the same.

[0026] The first communication hole 201 and the second communication hole 202 communicate with the second internal space 300 at a position closer to the box bottom wall 33 than to the box top wall 32. More preferably, the first communication hole 201 and the second communication hole 202 communicate with the second internal space 300 near the box bottom wall 33.

[0027] 2 , when the gas concentration detection device 10 is submerged in the sea (underwater), seawater (a liquid containing a component to be detected) LQD flows into the second internal space 300 through the first communication hole 201 and the second communication hole 202. More specifically, the first communication hole 201 is disposed on the upstream side of the tidal current, and the second communication hole 202 is disposed on the downstream side of the tidal current. As a result, the seawater LQD flows into the second internal space 300 from outside the housing 20 through the first communication hole 201, and flows out of the second internal space 300 to outside the housing 20 through the second communication hole 202.

[0028] At this time, by appropriately adjusting the way the housing 20 is submerged, the seawater LQD is contained up to a height at which the air pressure and water pressure are balanced in the second internal space 300. As a result, the second internal space 300 has a gas containing space capable of containing gas above the water surface (liquid surface) WS of the seawater LQD.

[0029] The atomizer 40, the pump 50, the component measurement sensor 61, the communication passages 711, 712, 720, and the power source PM are arranged in the first internal space 200 of the housing 20. The communication passages 711, 712, and 720 are cylindrical.

[0030] Although not shown, the power supply PM is electrically connected to the atomizer 40, the pump 50, and the component measurement sensor 61. The power supply PM supplies power to the atomizer 40, the pump 50, and the component measurement sensor 61. The atomizer 40, the pump 50, and the component measurement sensor 61 operate using this power.

[0031] The atomizer 40 is disposed between the housing bottom wall 23 and the box bottom wall 33. The atomizer 40 is a device that generates ultrasonic vibrations. The vibrating surface of the atomizer 40 abuts against the box bottom wall 33.

[0032] The pump 50, the component measuring sensor 61, and the power source PM are disposed between the box top wall 32 and the housing top wall 22. However, the position of the power source PM is not limited to this position.

[0033] The pump 50 has a gas inlet 501 and a gas outlet 502. The pump 50 draws in gas from the inlet 501 and discharges the drawn in gas from the outlet 502.

[0034] The component measuring sensor 61 has a gas inlet 611 and a gas outlet 612. The component measuring sensor 61 measures the concentration of a detection target component CA contained in the gas flowing from the gas inlet 611 to the gas outlet 612.

[0035] The intake port 501 of the pump 50 communicates with the gas accommodating space of the second internal space 300 through a communication passage 711. The discharge port 502 of the pump 50 communicates with the gas inlet port 611 of the component measuring sensor 61 through a communication passage 712. The gas outlet port 612 of the component measuring sensor 61 communicates with the gas accommodating space of the second internal space 300 through a communication passage 720.

[0036] In this configuration, the gas concentration detection device 10 measures the concentration of a detection target component (detection target gas: for example, carbon dioxide CO2) contained in the seawater LQD as follows: Note that the detection target gas is not limited to carbon dioxide, and may be, for example, methane CH4.

[0037] The gas concentration detection device 10 includes a control unit (not shown). The control unit is configured with a microcomputer, etc. Power is supplied to the control unit from a power source PM.

[0038] The control unit controls the operation of the atomizer 40, the pump 50, and the component measurement sensor 61. For example, the atomizer 40, the pump 50, and the component measurement sensor 61 start the operation of their respective functions under the operation start control from the control unit, and stop the operation of their respective functions under the operation stop control from the control unit.

[0039] When the atomizer 40 generates ultrasonic vibrations, the ultrasonic waves act on the seawater LQD in the second internal space 300, and a plurality of atomized particles MST are released from the water surface WS of the seawater LQD into the gas containing space.

[0040] Since the plurality of atomized particles MST are formed from the seawater LQD, the detection target component CA (e.g., carbon dioxide CO2) contained in the seawater LQD is also contained in the plurality of atomized particles MST. The concentration of the detection target component CA contained in the seawater LQD is the same as the concentration of each of the detection target components CA contained in the plurality of atomized particles MST.

[0041] The atomized particles MST released into the gas containing space come into contact with the gas in the gas containing space. This causes the detection target component CA to diffuse into the gas containing space. The detection target component CA is then exchanged between the atomized particles and the gas so that the concentrations of the detection target component CA are the same (so that a gas-liquid equilibrium state is reached). Therefore, the concentration of the detection target component CA in the gas in the gas containing space becomes the same as the concentration of the detection target component CA contained in the seawater LQD.

[0042] The pump 50 has a gas transporting capability, and sucks in the gas in the gas storage space through a communication passage 711 and discharges it to the component measuring sensor 61 through a communication passage 712 .

[0043] The component measuring sensor 61 measures the concentration of the detection target component CA contained in the gas. The gas whose concentration of the detection target component has been measured by the component measuring sensor 61 is returned to the gas storage space through the communication passage 720 by the gas transport capacity of the pump 50.

[0044] As described above, the concentration of the detection target component contained in the gas is the same as the concentration of the detection target component contained in the seawater LQD. Therefore, the concentration of the detection target component measured by the component measurement sensor 61 is the concentration of the detection target component contained in the seawater LQD.

[0045] With this configuration, the gas concentration detection device 10 can measure the concentration of a detection target component (detection target gas: for example, carbon dioxide CO2) contained in seawater LQD (detection target liquid).

[0046] In the gas concentration detection device 10, the atomized particles have a small particle size, and the number of atomized particles per unit volume can be increased. As a result, the total contact area between the gas and the atomized particles per unit volume is increased. Therefore, the speed at which the gas-liquid equilibrium state is reached is shortened.

[0047] Therefore, the gas concentration detection device 10 can shorten the time until the concentration of the detection target component reaches equilibrium between water such as seawater LQD and the gas in which the component measurement sensor 61 measures the concentration of the detection target component.

[0048] Furthermore, with this configuration, the gas concentration detection device 10 includes an ultrasonic atomizer and a gas transport pump, which allows the atomizer and pump to be small in size. This prevents the gas concentration detection device 10 from becoming too large. In other words, the gas concentration detection device 10 can be made smaller.

[0049] Furthermore, in the gas concentration detection device 10, external seawater LQD sequentially flows into and out of the second internal space 300 due to the current of the seawater LQD or the like through the first communication hole 201 and the second communication hole 202. This ensures that new seawater LQD is constantly supplied, so that the concentration of the detection target component in the gas within the gas accommodating space of the second internal space 300 approaches the concentration of the detection target component in the seawater LQD. Therefore, the gas concentration detection device 10 can further shorten the time until the concentration of the detection target component reaches equilibrium.

[0050] In this case, it is more preferable that the gas concentration detection device 10 be placed in the seawater LQD so that the first communication hole 201 faces the upstream side of the tidal current and the second communication hole 202 faces the downstream side of the tidal current. This allows the gas concentration detection device 10 to more stabilize the inflow and outflow of the seawater LQD into the second internal space 300.

[0051] [Second Embodiment] A gas concentration detection device according to a second embodiment of the present invention will be described with reference to the drawings. Fig. 3 is a functional block diagram showing an example of the gas concentration detection device according to the second embodiment.

[0052] The gas concentration detection device 10A according to the second embodiment differs from the gas concentration detection device 10 according to the first embodiment in that it includes a gas state measurement sensor 62. The other configuration of the gas concentration detection device 10A is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0053] The gas state measuring sensor 62 is disposed in the gas storage space in the second internal space 300. The gas state measuring sensor 62 measures at least one of the air pressure, temperature, and humidity of the gas in the gas storage space. Note that the gas state measuring sensor 62 is not limited to these conditions, and may measure other conditions as long as they cause an error in the measurement value of the component measuring sensor 61.

[0054] The component measuring sensor 61 or the control unit corrects the concentration of the detection target component measured by the component measuring sensor 61 based on the gas state (air pressure, temperature, humidity, etc.) measured by the gas state measuring sensor 62.

[0055] This allows the gas concentration detection device 10A to output the concentration of the detection target component with higher accuracy.

[0056] The gas state measuring sensor 62 may be disposed anywhere within the gas containing space, but is preferably disposed close to the point where the communication passage 711 communicates with the second internal space 300. This allows the gas state to be measured most recently up until the signal is input to the component measuring sensor 61. This allows the gas concentration detection device 10A to output the concentration of the detection target component with even higher accuracy.

[0057] [Third Embodiment] A gas concentration detection device according to a third embodiment of the present invention will be described with reference to the drawings. Fig. 4 is a functional block diagram showing an example of the gas concentration detection device according to the third embodiment.

[0058] The gas concentration detection device 10B according to the third embodiment differs from the gas concentration detection device 10 according to the first embodiment in that it includes a gas permeable membrane 80. The other configuration of the gas concentration detection device 10B is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0059] The gas permeable membrane 80 allows the detection target component CA to pass through, but prevents seawater LQD (liquid) from passing through.

[0060] The gas permeable membrane 80 is provided above the position where the first communication hole 201 and the second communication hole 202 communicate with each other in the second internal space 300. More specifically, the gas permeable membrane 80 is disposed between the box top wall 32 and the water surface WS when the air pressure and water pressure in the second internal space 300 are balanced.

[0061] The gas permeable membrane 80 spatially separates the second internal space 300 into an upper space on the box top wall 32 side and a lower space on the box bottom wall 33 side.

[0062] With this configuration, gas concentration detection device 10B can suppress the inflow of seawater LQD into the upper space above gas permeable membrane 80. This allows gas concentration detection device 10B to suppress flooding of pump 50 and component measurement sensor 61. Therefore, gas concentration detection device 10B can improve its reliability.

[0063] [Fourth Embodiment] A gas concentration detection device according to a fourth embodiment of the present invention will be described with reference to the drawings. Fig. 5 is a functional block diagram showing an example of the gas concentration detection device according to the fourth embodiment.

[0064] A gas concentration detection device 10D according to the fourth embodiment differs from the gas concentration detection device 10 according to the first embodiment in that it includes a flow rate sensor 63. The other configuration of the gas concentration detection device 10D is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0065] The flow rate sensor 63 is disposed in contact with the box bottom wall 33 in the second internal space 300. Note that the flow rate sensor 63 does not need to be in contact with the box bottom wall 33 as long as it can measure the flow rate of the seawater LQD in the second internal space 300.

[0066] In this case, it is preferable that the flow rate sensor 63 does not overlap the atomizer 40 when the gas concentration detection device 10D is viewed from above.

[0067] The flow rate sensor 63 measures the flow rate of the seawater LQD in the second internal space 300 .

[0068] If the flow rate measured by the flow rate sensor 63 is equal to or greater than the threshold value for permitting component measurement, the control unit activates the component measurement sensor 61. The component measurement sensor 61 measures the concentration of the detection target component based on an operation instruction from the control unit.

[0069] This allows the component measurement sensor 61 to measure the concentration of the detection target component when the concentration of the detection target component contained in the seawater LQD in the second internal space 300 is stable and the concentration of the detection target component input to the component measurement sensor 61 is stable. Therefore, the gas concentration detection device 10D can output the concentration of the detection target component with higher accuracy.

[0070] [Fifth Embodiment] A gas concentration detection device according to a fifth embodiment of the present invention will be described with reference to the drawings. Fig. 6 is a plan cross-sectional view of the gas concentration detection device according to the fifth embodiment. Fig. 6 is a cross-sectional view of the same portion as Fig. 1(B).

[0071] A gas concentration detection device 10E according to the fifth embodiment differs from the gas concentration detection device 10 according to the first embodiment in that it includes a first opening / closing member 91 and a second opening / closing member 92. The other configuration of the gas concentration detection device 10B is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0072] The first opening / closing member 91 is disposed at a position where the first communication hole 201 opens to the outer surface of the housing side wall 21. The first opening / closing member 91 controls the opening and closing of the first communication hole 201 to the outside of the housing 20.

[0073] The second opening / closing member 92 is disposed at a position where the second communication hole 202 opens to the outer surface of the housing side wall 21. The second opening / closing member 92 controls the opening and closing of the second communication hole 202 to the outside of the housing 20.

[0074] The operations of the first opening / closing member 91 and the second opening / closing member 92 are controlled by, for example, a control unit.

[0075] With this configuration, the gas concentration detection device 10E can control the flow rate of the seawater LQD flowing into the second internal space 300 and the flow rate of the seawater LQD flowing out of the second internal space 300. This allows the gas concentration detection device 10E to control the flow of the seawater LQD within the second internal space 300, and measure the concentration of the detection target component.

[0076] [Sixth Embodiment] A gas concentration detection device according to a sixth embodiment of the present invention will be described with reference to the drawings. Fig. 7 is a functional block diagram showing an example of the gas concentration detection device according to the sixth embodiment.

[0077] A gas concentration detection device 10F according to the sixth embodiment differs from the gas concentration detection device 10 according to the first embodiment in the structure of a box 30F and the arrangement of an atomizer 40. Other configurations of the gas concentration detection device 10F are similar to those of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0078] The box body bottom wall 33 of the box body 30F has an upwardly recessed recess 330. In other words, the box body bottom wall 33 has the recess 330 recessed toward the second internal space 300.

[0079] The atomizer 40 is disposed in the recess 330 .

[0080] In this configuration, a step is created in the second internal space 300 by the recess 330. The seawater LQD flowing into the second internal space 300 collides with this step, causing the flow to stop. Therefore, the time that the seawater LQD remains in the second internal space 300 can be extended while allowing the seawater LQD to flow.

[0081] This allows the gas concentration detection device 10F to stabilize the generation by the atomizer 40 of a plurality of atomized particles containing the detection target component.

[0082] [Seventh Embodiment] A gas concentration detection device according to a seventh embodiment of the present invention will be described with reference to the drawings. Fig. 8 is a functional block diagram showing an example of the gas concentration detection device according to the seventh embodiment.

[0083] A gas concentration detection device 10G according to the seventh embodiment differs from the gas concentration detection device 10 according to the first embodiment in the shapes of a first communication hole 201G and a second communication hole 202G. The other configuration of the gas concentration detection device 10G is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0084] The first flow path cross-sectional area S201 of the first communication hole 201G is different from the second flow path cross-sectional area S202 of the second communication hole 202G. More specifically, the second flow path cross-sectional area S202 of the second communication hole 202G is smaller than the first flow path cross-sectional area S201 of the first communication hole 201G.

[0085] In this configuration, it is easy to make the flow rate of the seawater LQD flowing into the second internal space 300 greater than the flow rate of the seawater LQD flowing out. This makes it possible to lengthen the time that the seawater LQD remains in the second internal space 300 while allowing the seawater LQD to flow.

[0086] This allows the gas concentration detection device 10G to stabilize the generation by the atomizer 40 of a plurality of atomized particles containing the detection target component.

[0087] Depending on the atomization capacity of the atomizer 40, the second flow path cross-sectional area S202 of the second communication hole 202G may be larger than the first flow path cross-sectional area S201 of the first communication hole 201G.

[0088] In this way, the gas concentration detection device 10G can achieve appropriate atomization by appropriately adjusting the first flow path cross-sectional area S201 of the first communication hole 201G and the second flow path cross-sectional area S202 of the second communication hole 202G.

[0089] Eighth Embodiment A gas concentration detection device according to an eighth embodiment of the present invention will be described with reference to the drawings. Fig. 9 is a cross-sectional view showing an example of the outer shape of the gas concentration detection device according to the eighth embodiment. Fig. 9 is a cross-sectional view taken along a plane perpendicular to the side wall of the housing.

[0090] A gas concentration detection device 10H according to the eighth embodiment differs from the gas concentration detection device 10 according to the first embodiment in the external shape of a housing 20H. Other configurations of the gas concentration detection device 10H are similar to those of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0091] The housing 20H has a streamlined shape in a plan view. More specifically, the housing 20H includes a housing side wall 21H. The housing side wall 21H is a cylindrical body and has a streamlined shape in a plan view.

[0092] A first communication hole 201 is formed at the leading end of the streamlined housing side wall 21H. A second communication hole 202 is formed at the trailing end of the streamlined housing side wall 21H.

[0093] In this configuration, gas concentration detection device 10H is placed in seawater LQD so that it can rotate in a plan view, causing gas concentration detection device 10H to naturally rotate so that first communication hole 201 faces the incoming direction (upstream) of the tidal current and second communication hole 202 faces the downstream side of the tidal current.

[0094] Therefore, in the gas concentration detection device 10H, seawater LQD can effectively flow into the second internal space 300 through the first communication hole 201 due to the tidal current, and can flow out through the second communication hole 202.

[0095] [Ninth embodiment] A gas concentration detection device according to a ninth embodiment of the present invention will be described with reference to the drawings. Fig. 10 is a plan cross-sectional view of the gas concentration detection device according to the ninth embodiment. Fig. 10 is a cross-sectional view of the same portion as Fig. 1(B).

[0096] The gas concentration detection device 10I according to the ninth embodiment differs from the gas concentration detection device 10 according to the first embodiment in that it includes a flow path 290 in the second internal space 300. The other configuration of the gas concentration detection device 10I is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0097] The box 30 has flow path walls 29 in the second internal space 300. The flow path walls 29 are a pair of walls that stand upright from the box bottom wall 33 toward the second internal space 300. The flow path walls 29 stand upright higher than the distance between the water surface WS and the box bottom wall 33 shown in the first embodiment.

[0098] A flow path 290 for the seawater LQD is formed by a three-dimensional portion surrounded by the pair of flow path walls 29 and the box bottom wall 33. One end of the flow path 290 communicates with the first communication hole 201. The other end of the flow path 290 communicates with the second communication hole 202.

[0099] The flow path 290 is serpentine in plan view.

[0100] The gas concentration detection device 10I includes a plurality of atomizers 40. The plurality of atomizers 40 are arranged along a flow path 290. The plurality of atomizers 40 are arranged at positions overlapping the flow path 290 in a plan view.

[0101] With this configuration, the gas concentration detection device 10I can achieve the same effects as the gas concentration detection device 10 according to the first embodiment. Furthermore, the gas concentration detection device 10I can control the flow rate of the seawater LQD that flows into and out of the second internal space 300 by using the shape of the flow path 290.

[0102] In gas concentration detection device 10I, flow path 290 includes wide portion 291 and narrow portion 292. The multiple atomizers 40 are arranged at positions overlapping with wide portion 291 in a plan view.

[0103] As a result, the flow velocity of the seawater LQD decreases at the wide portion 291. Then, the multiple atomizers 40 can concentrate on atomizing the seawater LQD whose flow velocity has decreased.

[0104] Therefore, for example, effective atomization can be achieved while keeping the total area of ​​the vibration surfaces of the multiple atomizers 40 small.

[0105] In gas concentration detection device 10I, flow path 290 does not have a constant width, but flow path 290 may have a constant width. Furthermore, the shape of flow path 290 is not limited to a meandering shape.

[0106] [Tenth Embodiment] A gas concentration detection device according to a tenth embodiment of the present invention will be described with reference to the drawings. Fig. 11 is a functional block diagram showing an example of a gas concentration detection device according to the tenth embodiment.

[0107] A gas concentration detection device 10J according to the seventh embodiment differs from the gas concentration detection device 10 according to the first embodiment in a first communication hole 201J and a second communication hole 202J. The other configuration of the gas concentration detection device 10J is similar to that of the gas concentration detection device 10 according to the first embodiment, and a description of similar parts will be omitted.

[0108] The first communication hole 201J and the second communication hole 202K are provided at different positions in the height direction of the housing 20 and the box body 30. More specifically, the first communication hole 201J is provided at a lower position than the second communication hole 202J in the height direction of the housing 20 and the box body 30. In other words, the first communication hole 201J is provided at a position closer to the box body bottom wall 33 than the second communication hole 202J.

[0109] With this configuration, the pressure applied to the second internal space 300 from outside (underwater) the housing 20 and the box body 30 is higher at the first communication hole 201J. This makes it easier for the gas concentration detection device 10J to draw seawater LQD into the second internal space 300.

[0110] In Figure 11, the first communication hole 201J is provided in a position flush with the bottom wall 33 of the box body, but this is just one example, and it is sufficient if the first communication hole 201J is provided in a position closer to the bottom wall 33 of the box body in the height direction than the second communication hole 202J.

[0111] Furthermore, the configurations of the above-described embodiments can be combined as appropriate, and effects can be achieved according to the combination.

[0112] <1> A gas concentration detection device comprising: a housing having a first internal space; a box-like body disposed in the first internal space, the box-like body having a second internal space into which a liquid flows in from the outside of the housing and into which the liquid flows out to the outside of the housing, the box-like body having a gas storage space capable of storing a gas above a liquid level of the flowed-in liquid in the second internal space; an atomizer disposed on a bottom surface of the box-like body and atomizing the liquid in the second internal space; a pump having an intake port and an outlet port, the intake port communicating with the gas storage space in the second internal space; and a component measurement sensor having a gas inlet port and a gas outlet port, the gas inlet port communicating with the outlet port of the pump and the gas outlet port communicating with the gas storage space, the component measurement sensor measuring a concentration of a detection target component contained in the gas.

[0113] <2> The gas concentration detection device according to <1>, wherein the housing and the box body have a first communication hole and a second communication hole that connect the second internal space to the outside of the housing.

[0114] <3> The gas concentration detection device according to <2>, further comprising a gas-permeable membrane that allows the detection target component to pass through and suppresses permeation of the liquid, wherein the gas-permeable membrane is provided above a position in the second internal space where the first communication hole and the second communication hole communicate with each other.

[0115] <4> The gas concentration detection device according to any one of <1> to <3>, further comprising a gas state measurement sensor disposed in the gas storage space and configured to measure at least one of the air pressure, temperature, and humidity of the gas.

[0116] <5> The gas concentration detection device according to any one of <1> to <4>, further comprising a flow rate sensor that measures a flow rate of the liquid in the second internal space.

[0117] <6> The gas concentration detection device according to <2>, wherein the first communication hole and the second communication hole are provided at positions opposite to each other on the side wall of the housing.

[0118] <7> The gas concentration detection device according to <2> or <6>, further comprising at least one of a first opening / closing member that controls opening and closing of the first communication hole to the outside of the housing, and a second opening / closing member that controls opening and closing of the second communication hole to the outside of the housing.

[0119] <8> The gas concentration detection device according to any one of <2>, <6>, and <7>, wherein a first flow path cross-sectional area of ​​the first communication hole and a second flow path cross-sectional area of ​​the second communication hole are different.

[0120] <9> The gas concentration detection device according to <8>, wherein a second flow path cross-sectional area of ​​the second communication hole is smaller than a first flow path cross-sectional area of ​​the first communication hole.

[0121] <10> The gas concentration detection device according to any one of <2>, <6>, <7>, <8>, and <9>, wherein the first communication hole is provided at a lower position than the second communication hole in a height direction of the housing and the box body.

[0122] <11> The gas concentration detection device according to any one of <1> to <10>, wherein the bottom wall of the box has a recess that is recessed upward, and the atomizer is disposed in the recess.

[0123] <12> The gas concentration detection device according to any one of <1> to <11>, wherein the housing has a streamlined shape in a plan view.

[0124] <13> The gas concentration detection device according to any one of <1> to <12>, wherein the box includes a flow path wall that forms a flow path for the liquid, and the atomizer is disposed at a position overlapping the flow path in a plan view of the housing.

[0125] <14> The gas concentration detection device according to <13>, wherein the flow path has a wide portion and a narrow portion.

[0126] <15> The gas concentration detection device according to <14>, wherein the atomizer is disposed at a position overlapping the wide portion of the flow path.

[0127] 10, 10A, 10B, 10D, 10E, 10F, 10G, 10H, 10I, 10J: Gas concentration detection device 20, 20H: Housing 21, 21H: Housing side wall 22: Housing top wall 23: Housing bottom wall 29: Flow path wall 30, 30F: Box 31: Box side wall 32: Box top wall 33: Box bottom wall 40: Atomizer 50: Pump 61: Component measurement sensor 62: Gas state measurement sensor 63: Flow rate sensor 80: Gas permeable membrane 91: First opening / closing member 92: Second opening / closing member 200: First internal space 201, 201J: First communication hole 202, 202G, 202J: Second communication hole 290: Flow path 291: Wide area 292: Narrow area 300: Second internal space 330: Recess 501: Intake port 502: Discharge port 611: Gas inlet port 612: Gas outlet port 711, 712, 720: Communication path PM: Power source S201: First flow path cross-sectional area S202: Second flow path cross-sectional area

Claims

1. A gas concentration detection device comprising: a housing having a first internal space; a box body arranged in the first internal space, having a second internal space into which liquid flows in from the outside of the housing and into which the liquid flows out to the outside of the housing, the box body having a gas storage space capable of storing gas above a liquid level of the flowed-in liquid in the second internal space; an atomizer arranged on a bottom surface of the box body and atomizing the liquid in the second internal space; a pump having an intake port and an exhaust port, the intake port communicating with the gas storage space in the second internal space; and a component measurement sensor having a gas input port and a gas output port, the gas input port communicating with the exhaust port of the pump and the gas output port communicating with the gas storage space, the component measurement sensor measuring the concentration of a detection target component contained in the gas.

2. A gas concentration detection device as described in claim 1, wherein the housing and the box are provided with a first communication hole and a second communication hole that connect the second internal space to the outside of the housing.

3. A gas concentration detection device as described in claim 2, further comprising a gas-permeable membrane that allows the detection target component to pass therethrough and suppresses the permeation of the liquid, said gas-permeable membrane being provided above a position in said second internal space where said first communication hole and said second communication hole are connected.

4. A gas concentration detection device as claimed in any one of claims 1 to 3, further comprising a gas state measurement sensor disposed in the gas storage space for measuring at least one of the air pressure, temperature and humidity of the gas.

5. A gas concentration detection device as described in any one of claims 1 to 4, further comprising a flow rate sensor that measures the flow rate of the liquid in the second internal space.

6. A gas concentration detection device as set forth in claim 2, wherein the first communication hole and the second communication hole are provided at positions opposite each other in the side wall of the housing.

7. A gas concentration detection device as described in claim 2 or claim 6, comprising at least one of a first opening / closing member that controls the opening and closing of the first communication hole to the outside of the housing, and a second opening / closing member that controls the opening and closing of the second communication hole to the outside of the housing.

8. A gas concentration detection device as set forth in any one of claims 2, 6 and 7, wherein a first flow passage cross-sectional area of ​​the first communication hole and a second flow passage cross-sectional area of ​​the second communication hole are different.

9. A gas concentration detection device as set forth in claim 8, wherein a second flow passage cross-sectional area of ​​the second communication hole is smaller than a first flow passage cross-sectional area of ​​the first communication hole.

10. A gas concentration detection device as described in any one of claims 2, 6, 7, 8 and 9, wherein the first communication hole is provided at a lower position than the second communication hole in the height direction of the housing and the box body.

11. A gas concentration detection device as claimed in any one of claims 1 to 10, wherein the bottom wall of the box has an upwardly recessed recess, and the atomizer is disposed in the recess.

12. A gas concentration detection device according to any one of claims 1 to 11, wherein the housing is streamlined in a plan view.

13. A gas concentration detection device as described in any one of claims 1 to 12, wherein the box body has a flow path wall that forms a flow path for the liquid, and when viewed in a plane of the housing, the atomizer is positioned so as to overlap the flow path.

14. The gas concentration detection device according to claim 13, wherein the flow path has a wide portion and a narrow portion.

15. The gas concentration detection device according to claim 14, wherein the atomizer is disposed at a position overlapping the wide portion of the flow path.

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