Gas Detection System and Gas Detection Device

Abstract

To provide an improved gas detection system.SOLUTION: The gas detection system includes a first sensor unit that outputs a voltage corresponding to the concentration of specific gas, a reservoir capable of storing sample gas or purge gas to be supplied to the first sensor unit, and a control unit. The control unit detects the type and concentration of gas contained in the sample gas on the basis of the detection results of the first sensor unit. The control unit sets a collection period during which the gas in a predetermined space is collected in the reservoir as sample gas or purge gas and a supply period during which the sample gas or purge gas is supplied to the first sensor unit so as to be different from each other.SELECTED DRAWING: Figure 2

Description

Cross - reference to related applications

[0001] This application claims the priority of Japanese Patent Application No. 2019 - 086575, filed in Japan on April 26, 2019, and the entire disclosure of the prior application is incorporated herein by reference for all purposes.

Technical Field

[0002] This disclosure relates to a gas detection system.

Background Art

[0003] Conventionally, a system for detecting odorous gases generated from feces discharged by a subject has been known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] A gas detection system according to an embodiment of the present disclosure includes a first sensor unit that outputs a voltage corresponding to the concentration of a specific gas, a storage tank capable of storing a sample gas or a purge gas to be supplied to the first sensor unit, a control unit that detects the type and concentration of the gas contained in the sample gas based on the detection result of the first sensor unit. The control unit sets the collection period for collecting the gas in a predetermined space as a sample gas or a purge gas in the storage tank and the supply period for supplying the sample gas or the purge gas to the first sensor unit to be in different time zones.

[0006] A gas detection system according to an embodiment of the present disclosure includes a first sensor unit that outputs a voltage corresponding to the concentration of a specific gas, A first storage tank capable of storing purge gas to be supplied to the first sensor unit, A control unit that collects the gas in the predetermined space as purge gas into the first storage tank when a ventilation fan installed in the predetermined space is in a driving state, The ventilation fan can exchange the gas in the predetermined space with the gas outside the predetermined space.

[0007] A gas detection system according to an embodiment of the present disclosure, A first sensor unit that outputs a voltage according to the concentration of a specific gas, A first storage tank capable of storing purge gas to be supplied to the first sensor unit, A control unit that detects the type and concentration of the gas contained in the sample gas based on the detection result of the first sensor unit, The control unit, Performs a first refresh process on the first sensor unit by the gas remaining in the first storage tank or by the gas in the predetermined space, Performs a second refresh process on the first sensor unit by the purge gas stored in the first storage tank.

Brief Description of Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

[0009] There is room for improvement in the conventional system.

[0010] The present disclosure relates to providing an improved gas detection system.

[0011] According to an embodiment of the present disclosure, an improved gas detection system can be provided.

[0012] Hereinafter, embodiments according to the present disclosure will be described with reference to the schematically shown drawings.

[0013] (First Embodiment) [Example of Configuration of Gas Detection System] FIG. 1 is an external view of a gas detection system 1 according to the first embodiment of the present disclosure. FIG. 2 is a schematic view of the gas detection system 1 shown in FIG. 1. FIG. 2 shows a state in which a part of the housing 10 included in the gas detection system 1 is removed. FIG. 3 is a functional block diagram of the gas detection system 1 shown in FIG. 1.

[0014] As shown in FIG. 1, the gas detection system 1 is arranged in a toilet room 100 (predetermined space). In the present embodiment, it is assumed that the predetermined space where the gas detection system 1 is arranged is the toilet room 100 as shown in FIG. 1. However, the predetermined space in the present disclosure is not limited to the toilet room 100. The predetermined space may be any space as long as it is a space in which the gas to be detected by the gas detection system of the present disclosure can be generated. The gas detection system 1 is also referred to as a "gas detection device".

[0015] As shown in FIG. 1, the gas detection system 1 is installed in the toilet 2. The toilet 2 may be a flush toilet, although not limited thereto. The gas detection system 1 may be installed at any location of the toilet 2. As an example, as shown in FIG. 1, the gas detection system 1 may be arranged from between the toilet bowl 2A and the toilet seat 2B to the outside of the toilet 2. A part of the gas detection system 1 may be embedded inside the toilet seat 2B. Feces of the subject can be discharged into the toilet bowl 2A of the toilet 2. The gas detection system 1 can acquire the gas generated from the feces discharged into the toilet bowl 2A as a sample gas. The gas detection system 1 can detect the type and concentration of the gas contained in the sample gas, etc. The gas detection system 1 can transmit the detection result, etc. to the electronic device 3.

[0016] The use of the gas detection system 1 is not limited to the above-mentioned use. For example, the gas detection system 1 may be installed inside a refrigerator as a predetermined space. In this case, the gas detection system 1 can acquire the gas generated from food as a sample gas. For example, the gas detection system 1 may be installed in a factory or a laboratory as a predetermined space. In this case, the gas detection system 1 can acquire the gas generated from chemicals, etc. as a sample gas.

[0017] The toilet 2 can be installed in a toilet room 100 such as a house or a hospital. The toilet 2 can be used by the subject. The toilet 2 includes a toilet bowl 2A and a toilet seat 2B. Feces of the subject can be discharged into the toilet bowl 2A.

[0018] The electronic device 3 is, for example, a smartphone used by the subject. However, the electronic device 3 is not limited to a smartphone and may be any electronic device. When the electronic device 3 is brought into the toilet room 100 by the subject, it may be present inside the toilet room 100 as shown in FIG. 1. However, the electronic device 3 may be present outside the toilet room 100, for example, when the subject does not bring the electronic device 3 into the toilet room 100. The electronic device 3 can receive the detection result from the gas detection system 1 by wireless communication or wired communication. The electronic device 3 can display the received detection result on the display unit 3A. The display unit 3A may be configured to include a display capable of displaying characters and the like and a touch screen capable of detecting contact with a finger or the like of the user (subject). The display may be configured to include a display device such as a liquid crystal display (LCD), an organic EL display (OELD), or an inorganic EL display (ILED). The detection method of the touch screen may be any method such as a capacitance method, a resistive film method, a surface acoustic wave method, an ultrasonic method, an infrared method, an electromagnetic induction method, or a load detection method.

[0019] The ventilation fan 4 may be installed on the ceiling of the toilet room 100. When the ventilation fan 4 is in a driving state, it can exchange the air inside the toilet room 100 and the air outside the toilet room 100. The ventilation fan 4 may be communicable with the gas detection system 1. The ventilation fan 4 may transmit a signal indicating the state of the ventilation fan 4 to the gas detection system 1. For example, when the ventilation fan 4 is in a driving state, the ventilation fan 4 may transmit a signal indicating that the ventilation fan 4 is in a driving state to the gas detection system 1. For example, when the ventilation fan 4 is in a non-operating state, the ventilation fan 4 may transmit a signal indicating that the ventilation fan 4 is in a non-operating state to the gas detection system 1.

[0020] As shown in FIG. 2, the gas detection system 1 includes a housing 10, a suction hole 20, a suction hole 21, a discharge path 22, flow paths 23, 24, a chamber 30, a supply unit 50, a supply unit 51, and a circuit board 60. The gas detection system 1 includes a storage tank capable of storing the air (gas in a predetermined space) in the toilet chamber 100 as shown in FIG. 1 as a sample gas or a purge gas. In the present embodiment, the storage tank includes a storage tank 40 (second storage tank) capable of storing a sample gas and a storage tank 41 (first storage tank) capable of storing a purge gas. However, the storage tank may include only one of the storage tank 40 and the storage tank 41. As shown in FIG. 2, the gas detection system 1 includes a sensor unit 31 (first sensor unit) inside the chamber 30. The flow path 23 includes a flow path 23-1 and a flow path 23-2. The flow path 24 includes a flow path 24-1 and a flow path 24-2. The gas detection system 1 may include a valve 20B and a valve 21B. The gas detection system 1 may include valves 25, 26, a flow path 27, a flow path 28, and a supply unit 52. The flow path 27 includes a flow path 27-1, a flow path 27-2, and a flow path 27-3. As shown in FIG. 3, the gas detection system 1 includes a storage unit 61, a communication unit 62, and a control unit 64 inside the circuit board 60. The gas detection system 1 includes a sensor unit 63 (second sensor unit). Further, the gas detection system 1 may include a battery, a speaker, and the like.

[0021] Various components of the gas detection system 1 are housed in the housing 10. The housing 10 may be made of any material. For example, the housing 10 may be made of a material such as metal or resin.

[0022] As shown in FIG. 1, the suction hole 20 can be exposed inside the toilet bowl 2A. A part of the suction hole 20 may be embedded in the toilet seat 2B. The suction hole 20 sucks the gas generated from the feces discharged into the toilet bowl 2A as sample gas. The sample gas sucked by the suction hole 20 is supplied to and stored in the storage tank 40 via a valve 20B as shown in FIG. 2. As shown in FIG. 1, one end of the suction hole 20 may be directed toward the inside of the toilet bowl 2A. As shown in FIG. 2, the other end of the suction hole 20 may be connected to the storage tank 40. The suction hole 20 may be constituted by a tubular member such as a resin tube or a metal or glass pipe.

[0023] As shown in FIG. 2, the suction hole 20 may have a blower 20A on its outside. The blower 20A may be constituted by including a fan and a motor. The blower 20A can rotate the fan by driving the motor based on the control of the control unit 64. By rotating the fan, the blower 20A draws the gas generated from the feces toward the vicinity of the suction hole 20. When the blower 20A draws the gas generated from the feces toward the vicinity of the suction hole 20, and further when the valve 25 connects the flow path 23-1 and the flow path 23-2, and the supply unit 50 is driven, the suction hole 20 can suck the gas generated from the feces in the toilet bowl 2A.

[0024] The valve 20B is located between the suction hole 20, the storage tank 40, and the flow path 28. The valve 20B includes a connection port connected to the suction hole 20, a connection port connected to the inlet portion of the storage tank 40, and a connection port connected to the flow path 28. The valve 20B may be constituted by a valve such as an electromagnetic drive, a piezo drive, or a motor drive.

[0025] Based on the control of the control unit 64, the valve 20B switches the connection state between the suction hole 20, the storage tank 40, and the flow path 28. For example, the valve 20B switches the connection state between them to a state where the suction hole 20 and the storage tank 40 are connected, a state where the storage tank 40 and the flow path 28 are connected, or a state where the suction hole 20, the storage tank 40, and the flow path 28 are not connected.

[0026] When the suction hole 20 sucks the sample gas, the valve 20B is brought into a state where the suction hole 20 and the storage tank 40 are connected based on the control of the control unit 64. Further, when the sample gas is stored in the storage tank 40, the valve 20B is brought into a state where the suction hole 20, the storage tank 40, and the flow path 28 are not connected based on the control of the control unit 64. By bringing the valve 20B into a state where the storage tank 40 and the suction hole 20 are not connected, the probability that the sample gas in the storage tank 40 comes into contact with the outside air can be reduced.

[0027] As shown in FIG. 1, the suction hole 21 can be exposed to the outside of the toilet bowl 2A. A part of the suction hole 21 may be embedded in the toilet seat 2B. The suction hole 21 sucks, for example, the air (environmental gas) in the toilet chamber 100 outside the toilet bowl 2A as purge gas. The purge gas sucked by the suction hole 21 is supplied to and stored in the storage tank 41 via a valve 21B as shown in FIG. 2. As shown in FIG. 1, one end of the suction hole 21 may be directed to the outside of the toilet 2. As shown in FIG. 2, the other end of the suction hole 21 may be connected to the storage tank 41. The suction hole 21 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0028] As shown in FIG. 2, the suction hole 21 may have a blower 21A on its outside. The blower 21A may be composed of a fan and a motor. The blower 21A can rotate the fan by driving the motor based on the control of the control unit 64. By rotating the fan, the blower 21A draws the air in the toilet chamber 100 to the vicinity of the suction hole 21. When the blower 21A draws the air in the toilet chamber 100 to the vicinity of the suction hole 21, and further the valve 26 connects the flow path 24-1 and the flow path 24-2, and the supply unit 51 is driven, the suction hole 21 can suck the air in the toilet chamber 100 as purge gas.

[0029] The valve 21B is located between the suction hole 21 and the storage tank 41. The valve 21B includes a connection port connected to the suction hole 21 and a connection port connected to the inlet portion of the storage tank 41. The valve 21B may be composed of a valve such as an electromagnetic drive, a piezo drive, or a motor drive.

[0030] Based on the control of the control unit 64, the valve 21B switches the connection state between the suction hole 21 and the storage tank 41. For example, the valve 21B switches the connection state between them to a state where the suction hole 21 and the storage tank 41 are connected, or a state where the suction hole 21 and the storage tank 41 are not connected.

[0031] When the suction hole 21 sucks the purge gas, the valve 21B makes the connection state between the suction hole 21 and the storage tank 41 based on the control of the control unit 64. Further, when the purge gas is stored in the storage tank 41, the valve 21B makes the connection state between the suction hole 21 and the storage tank 41 not connected based on the control of the control unit 64. By making the valve 20B not connect the storage tank 40 and the suction hole 20, the probability of the purge gas in the storage tank 41 coming into contact with the outside air can be reduced.

[0032] As shown in FIG. 1, a part of the discharge path 22 can be exposed to the outside of the toilet bowl 2A. The discharge path 22 as shown in FIG. 2 discharges the exhaust gas from the chamber 30 to the outside. This exhaust gas may contain the sample gas and the purge gas after the detection process. Further, the discharge path 22 can discharge the residual gas in the storage tank 40 to the outside through the flow path 23-1, the valve 25, the flow paths 27-1, 27-3, and the supply unit 52. Further, the discharge path 22 can discharge the residual gas in the storage tank 41 to the outside through the flow path 24-1, the valve 26, the flow paths 27-2, 27-3, and the supply unit 52. The discharge path 22 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0033] As shown in FIG. 2, when the valve 25 connects the flow path 23-1 and the flow path 23-2, the flow path 23 supplies the sample gas stored in the storage tank 40 to the chamber 30 through the supply unit 50. One end of the flow path 23-1 is connected to the outlet of the storage tank 40. The other end of the flow path 23-1 is connected to the valve 25. One end of the flow path 23-2 is connected to the valve 25. The other end of the flow path 23-2 is connected to the chamber 30. The flow path 23 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0034] As shown in FIG. 2, when the valve 26 connects the flow path 24-1 and the flow path 24-2, the purge gas stored in the storage tank 41 is supplied to the chamber 30 via the supply unit 51. One end of the flow path 24-1 is connected to the outlet of the storage tank 41. The other end of the flow path 24-1 is connected to the valve 26. One end of the flow path 24-2 is connected to the valve 26. The other end of the flow path 24-2 is connected to the chamber 30. The flow path 24 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0035] As shown in FIG. 2, the valve 25 is located between the flow path 23-1, the flow path 23-2, and the flow path 27-1. The valve 25 includes a connection port connected to the flow path 23-1, a connection port connected to the flow path 23-2, and a connection port connected to the flow path 27-1. The valve 25 may be composed of a valve such as an electromagnetic drive, a piezo drive, or a motor drive.

[0036] Based on the control of the control unit 64, the valve 25 switches the connection state between the flow path 23-1, the flow path 23-2, and the flow path 27-1. For example, the valve 25 switches the connection state between them to a state where the flow path 23-1 and the flow path 23-2 are connected, or a state where the flow path 23-1 and the flow path 27-1 are connected.

[0037] As shown in FIG. 2, the valve 26 is located between the flow path 24-1, the flow path 24-2, and the flow path 27-2. The valve 26 includes a connection port connected to the flow path 24-1, a connection port connected to the flow path 24-2, and a connection port connected to the flow path 27-2. The valve 26 may be composed of a valve such as an electromagnetic drive, a piezo drive, or a motor drive.

[0038] Based on the control of the control unit 64, the valve 26 switches the connection state between the flow path 24-1, the flow path 24-2, the flow path 27-2, and the flow path 28. For example, the valve 26 switches the connection state between them to a state where the flow path 24-1 and the flow path 24-2 are connected, a state where the flow path 24-1 and the flow path 27-2 are connected, or a state where the flow path 24-1 and the flow path 28 are connected.

[0039] As shown in Fig. 2, when the valve 25 connects the flow path 23-1 and the flow path 27-1, the residual gas in the storage tank 40 and the like are supplied to the discharge path 22 via the supply unit 52. When the valve 26 connects the flow path 24-1 and the flow path 27-2, the residual gas in the storage tank 41 and the like are supplied to the discharge path 22 via the supply unit 52. One end of the flow path 27-1 is connected to the valve 25. The other end of the flow path 27-1 is connected to one end of the flow path 27-3. One end of the flow path 27-2 is connected to the valve 26. The other end of the flow path 27-2 is connected to one end of the flow path 27-3. One end of the flow path 27-3 is connected to the other end of the flow path 27-1 and the other end of the flow path 27-2. The other end of the flow path 27-3 is connected to the discharge path 22. The flow path 27 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0040] As shown in Fig. 2, when the valve 26 connects the flow path 24-1 and the flow path 28, and the valve 20B connects the flow path 28 and the storage tank 40, the purge gas in the storage tank 41 is supplied to the storage tank 40. By supplying the purge gas to the storage tank 40 via the flow path 28, the sample gas in the storage tank 40 is pushed out into the flow path 23-1. One end of the flow path 28 is connected to the valve 20B. The other end of the flow path 28 is connected to the valve 26. The flow path 28 may be composed of a tubular member such as a resin tube or a metal or glass pipe.

[0041] As shown in FIG. 2, the chamber 30 has a sensor unit 31 inside. The chamber 30 may have a plurality of sensor units 31. The chamber 30 may be divided into a plurality of parts. Each sensor unit 31 may be arranged in each of the chambers 30 divided into a plurality of parts. The chambers 30 divided into a plurality of parts may be connected to each other. A flow path 23-2 is connected to the chamber 30. A sample gas is supplied to the chamber 30 from the flow path 23-2. Also, a flow path 24-2 is connected to the chamber 30. A purge gas is supplied to the chamber 30 from the flow path 24-2. Further, a discharge path 22 is connected to the chamber 30. The chamber 30 discharges the sample gas and the purge gas after the detection process from the discharge path 22.

[0042] The sensor unit 31 is arranged inside the chamber 30. The sensor unit 31 outputs a voltage corresponding to the concentration of a specific gas to the control unit 64. The specific gas includes a specific gas to be detected and a specific gas not to be detected. When the sample gas is a gas generated from feces, examples of the specific gas to be detected include methane, hydrogen, carbon dioxide, methyl mercaptan, hydrogen sulfide, acetic acid, and trimethylamine. Also, when the sample gas is a gas generated from feces, examples of the specific gas not to be detected include ammonia and water. Each of the plurality of sensor units 31 can output a voltage corresponding to the concentration of at least any one of these gases to the control unit 64.

[0043] As shown in FIG. 2, the storage tank 40 is connected to the connection port of the valve 20B. The connection part of the storage tank 40 with the connection port of the valve 20B is also referred to as the "inlet part". The storage tank 40 is connected to the flow path 23-1. The connection part of the storage tank 40 with the flow path 23-1 is also referred to as the "outlet part".

[0044] The storage tank 40 can store the sample gas. The sample gas stored in the storage tank 40 is supplied to the chamber 30 via the flow paths 23-1, 23-2, and the supply unit 50. Also, the residual gas etc. in the storage tank 40 can be discharged to the outside from the discharge path 22 via the flow path 23-1, the valve 25, and the flow paths 27-1, 27-3, and the supply unit 52.

[0045] An adsorbent 40a may be disposed inside the storage tank 40. Further, in the storage tank 40, concentration of the sample gas may be performed. In this case, an adsorbent 40b may be disposed inside the storage tank 40. Each of the adsorbent 40a and the adsorbent 40b may contain any material according to the application. Each of the adsorbent 40a and the adsorbent 40b may contain, for example, at least any one of activated carbon, silica gel, zeolite, and molecular sieve. The adsorbent 40a and the adsorbent 40b may be of a plurality of types or may contain a porous material.

[0046] The adsorbent 40a may adsorb a gas other than the detection target contained in the sample gas. Examples of the adsorbent 40a that adsorbs a gas other than the detection target include silica gel and zeolite.

[0047] The adsorbent 40b may adsorb the gas to be detected contained in the sample gas. Examples of the adsorbent 40b that adsorbs the gas to be detected include activated carbon and molecular sieve. However, these combinations may be appropriately changed depending on the polarity of the gas molecules to be adsorbed.

[0048] In the storage tank 40, the adsorbent 40a may be disposed in a location partitioned by the wall 40c. By partitioning the location where the adsorbent 40a is located, the gas flow path in the storage tank 40 can be lengthened. By lengthening the gas flow path in the storage tank 40, the time for the gas to contact the adsorbent 40a can be lengthened. Similarly, in the storage tank 40, the adsorbent 40b may be disposed in a partitioned manner by the wall 40c. By partitioning the location where the adsorbent 40b is located, the time for the gas to contact the adsorbent 40b in the storage tank 40 can be lengthened.

[0049] In the storage tank 40, the adsorbent 40a may be disposed on the side where the storage tank 40 is connected to the suction hole 20. In the storage tank 40, the adsorbent 40b may be disposed on the side where the storage tank 40 is connected to the flow path 23-1.

[0050] The storage tank 40 may be configured as a rectangular parallelepiped, a cylinder, a bag, or a tank or the like having a shape that fills the gaps between various components housed inside the housing 10. The storage tank 40 may be provided with a heater for heating at least one of the inner wall of the storage tank 40 and the adsorbent 40a.

[0051] The entire storage tank 40 may be partitioned by a wall 40c. By partitioning the entire storage tank 40, in the storage tank 40, the cross-sectional area of the gas flow path can be made smaller than the volume of the gas flow path. When the sample gas is pushed out from the storage tank 40 to the chamber 30, the cross-sectional area of the gas flow path being smaller than the volume of the gas flow path can reduce the contact area between the gas flowing into the storage tank 40 from the valve 20B and the sample gas stored in the storage tank 40. By reducing the contact area between the gas flowing into the storage tank 40 from the valve 20B and the sample gas stored in the storage tank 40, the mixing of the gas flowing into the storage tank 40 from the valve 20B with the sample gas in the storage tank 40 can be reduced.

[0052] As shown in FIG. 2, the storage tank 41 is connected to the connection port of the valve 21B. The connection portion of the storage tank 41 with the connection port of the valve 21B is also referred to as the "inlet portion". The storage tank 41 is connected to the flow path 24-1. The connection portion of the storage tank 41 with the flow path 24-1 is also referred to as the "outlet portion".

[0053] The storage tank 41 can store purge gas. The purge gas stored in the storage tank 41 is supplied to the chamber 30 via the flow paths 24-1, 24-2, and the supply unit 51. Further, the residual gas or the like in the storage tank 41 can be discharged to the outside from the discharge path 22 via the flow path 24-1, the valve 26, and the flow paths 27-2, 27-3, and the supply unit 52.

[0054] Inside the storage tank 41, the adsorbent 41a and the adsorbent 41b may be arranged. Each of the adsorbent 41a and the adsorbent 41a may contain any material according to the application. Each of the adsorbent 41a and the adsorbent 41b may contain, for example, at least any one of activated carbon, silica gel, zeolite, and molecular sieve. The adsorbent 41a and the adsorbent 41b may be of multiple types or may contain a porous material.

[0055] The adsorbent 41a may adsorb gases other than the detection target mixed in the purge gas. When the air in the toilet chamber 100 is used as the purge gas, gases other than the detection target may be mixed in the purge gas. By the adsorbent 41a adsorbing the gases other than the detection target mixed in the purge gas, the purge gas in the storage tank 41 can be purified. Examples of the adsorbent 41a that adsorbs gases other than the detection target include silica gel and zeolite. Also, the adsorbent 41b may adsorb the gas to be detected mixed in the purge gas. When the air in the toilet chamber 100 is used as the purge gas, the gas to be detected may be mixed in the purge gas. By the adsorbent 41a adsorbing the gas to be detected mixed in the purge gas, the purge gas in the storage tank 41 can be purified. Examples of the adsorbent 41b that adsorbs the gas to be detected include activated carbon and molecular sieve. However, these combinations may be appropriately changed according to the polarity of the gas molecules to be adsorbed.

[0056] In the storage tank 41, the adsorbent 41a may be partitioned and arranged by the wall 41c. By partitioning the adsorbent 41a, the gas flow path in the storage tank 41 can be lengthened. By lengthening the gas flow path in the storage tank 41, the contact time between the gas and the adsorbent 41a can be lengthened. Similarly, in the storage tank 41, the adsorbent 41b may be partitioned and arranged by the wall 41c. By partitioning the adsorbent 41b, the contact time between the gas and the adsorbent 41b in the storage tank 41 can be lengthened.

[0057] In the storage tank 41, the adsorbent 41a may be arranged on the side where the storage tank 41 is connected to the suction hole 21. In the storage tank 41, the adsorbent 41b may be arranged on the side where the storage tank 41 is connected to the flow path 24-1.

[0058] The storage tank 41 may be configured as a rectangular parallelepiped, a cylinder, a bag, or a tank having a shape that fills the gaps between various components housed inside the housing 10. The storage tank 41 may be provided with a heater for heating at least one of the inner wall of the storage tank 41, the adsorbent 41a, and the adsorbent 41b.

[0059] The whole of the storage tank 41 may be partitioned by a wall 41c. By partitioning the whole of the storage tank 41, in the storage tank 41, the cross-sectional area of the gas flow path can be made smaller than the volume of the gas flow path. When the cross-sectional area of the gas flow path becomes smaller than the volume of the gas flow path, when the purge gas is pushed out from the storage tank 41 to the chamber 30, the contact area between the gas flowing into the storage tank 41 from the valve 21B and the purge gas stored in the storage tank 41 can be made smaller. When the contact area between the gas flowing into the storage tank 41 from the valve 21B and the purge gas stored in the storage tank 41 becomes smaller, the mixing of the gas flowing into the storage tank 41 from the valve 21B with the purge gas in the storage tank 41 can be reduced. With such a configuration, for example, when the gas near the suction hole 21 is contaminated, the mixing of the contaminated gas with the purge gas in the storage tank 41 can be reduced.

[0060] The supply unit 50 as shown in FIG. 2 is attached to the flow path 23-2. When the valve 25 connects the flow path 23-1 and the flow path 23-2, the supply unit 50 can supply the sample gas stored in the storage tank 40 to the chamber 30. For example, the supply unit 50 supplies the sample gas stored in the storage tank 40 to the chamber 30 at a predetermined timing based on the control of the control unit 64. The arrow shown in the supply unit 50 indicates the direction in which the supply unit 50 sends the sample gas. The supply unit 50 may be configured by a piezo pump, a motor pump, or the like.

[0061] As shown in FIG. 2, the supply unit 51 is attached to the flow path 24-2. When the valve 26 connects the flow path 24-1 and the flow path 24-2, the supply unit 51 can supply the purge gas stored in the storage tank 41 to the chamber 30. For example, the supply unit 51 supplies the purge gas stored in the storage tank 41 to the chamber 30 at a predetermined timing based on the control of the control unit 64. The arrow shown in the supply unit 51 indicates the direction in which the supply unit 51 sends the purge gas. The supply unit 51 may be composed of a piezo pump, a motor pump, or the like.

[0062] As shown in FIG. 2, the supply unit 52 is attached to the flow path 27-3. When the valve 25 connects the flow path 23-1 and the flow path 27-1, the supply unit 52 can supply the residual gas or the like in the storage tank 40 to the discharge path 22. Further, when the valve 26 connects the flow path 24-1 and the flow path 27-2, the supply unit 52 can supply the residual gas or the like in the storage tank 41 to the discharge path 22. The supply unit 52 supplies at least one of the residual gas or the like in the storage tank 40 and the storage tank 41 to the discharge path 22 based on the control of the control unit 64. The arrow shown in the supply unit 52 indicates the direction in which the residual gas or the like is sent to the discharge path 22. The supply unit 52 may be composed of a piezo pump, a motor pump, or the like.

[0063] When the valve 20B connects the suction hole 20 and the storage tank 40, and the valve 25 connects the flow path 23-1 and the flow path 27-1, the supply unit 52 can supply the sample gas from the suction hole 20 to the storage tank 40. Further, when the valve 21B connects the suction hole 21 and the storage tank 41, and the valve 26 connects the flow path 24-1 and the flow path 27-2, the supply unit 52 can supply the purge gas from the suction hole 21 to the storage tank 41.

[0064] As shown in FIG. 3, the circuit board 60 mounts wirings through which electrical signals propagate, a storage unit 61, a communication unit 62, a control unit 64, and the like.

[0065] The storage unit 61 as shown in FIG. 3 is composed of, for example, a semiconductor memory, a magnetic memory, or the like. The storage unit 61 stores various kinds of information and programs for operating the gas detection system 1. The storage unit 61 may function as a work memory.

[0066] The communication unit 62 as shown in FIG. 3 can communicate with the electronic device 3 and the ventilation fan 4 as shown in FIG. 1. The communication method used in the communication between the communication unit 62, the electronic device 3, and the ventilation fan 4 may be a short-range wireless communication standard, a wireless communication standard for connecting to a mobile phone network, or a wired communication standard. The short-range wireless communication standard may include, for example, WiFi (registered trademark), Bluetooth (registered trademark), infrared rays, and NFC (Near Field Communication). The wireless communication standard for connecting to a mobile phone network may include, for example, LTE (Long Term Evolution) or a mobile communication system of the fourth generation or higher. Also, the communication method used in the communication between the communication unit 62, the electronic device 3, and an external server may be a communication standard such as LPWA (Low Power Wide Area) or LPWAN (Low Power Wide Area Network).

[0067] The sensor unit 63 as shown in FIG. 3 may be configured to include at least any one of an image camera, a personal identification switch, an infrared sensor, a pressure sensor, a cleanliness sensor, and the like. The sensor unit 63 outputs the detection result to the control unit 64.

[0068] For example, when the sensor unit 63 is configured to include an infrared sensor, the sensor unit 63 can detect that the subject has entered the toilet room 100 by detecting the reflected light of the infrared rays irradiated by the infrared sensor from the object. The sensor unit 63 outputs a signal indicating that the subject has entered the toilet room 100 to the control unit 64 as the detection result.

[0069] For example, when the sensor unit 63 includes an infrared sensor, it can detect that the subject has left the toilet room 100 by detecting the reflected light of the infrared rays irradiated by the infrared sensor from the object. As a detection result, the sensor unit 63 outputs a signal indicating that the subject has left the toilet room 100 to the control unit 64.

[0070] For example, when the sensor unit 63 includes a pressure sensor, it can detect that the subject has sat on the toilet seat 2B by detecting the pressure applied to the toilet seat 2B as shown in FIG. 1. As a detection result, the sensor unit 63 outputs a signal indicating that the subject has sat on the toilet seat 2B to the control unit 64.

[0071] For example, when the sensor unit 63 includes a pressure sensor, it can detect that the subject has stood up from the toilet seat 2B by detecting a reduction in the pressure applied to the toilet seat 2B as shown in FIG. 1. As a detection result, the sensor unit 63 outputs a signal indicating that the subject has stood up from the toilet seat 2B to the control unit 64.

[0072] For example, when the sensor unit 63 includes an image camera, a personal identification switch, etc., it collects data such as facial images, sitting height, and weight. The sensor unit 63 identifies and detects an individual from the collected data. As a detection result, the sensor unit 63 outputs a signal indicating the identified individual to the control unit 64.

[0073] For example, when the sensor unit 63 includes a personal identification switch, etc., it identifies (detects) an individual based on the operation of the personal identification switch. In this case, personal information may be registered (stored) in the storage unit 61 in advance. As a detection result, the sensor unit 63 outputs a signal indicating the identified individual to the control unit 64.

[0074] For example, when the sensor unit 63 includes a cleanliness sensor, it detects the cleanliness of the air in the toilet compartment 100. The sensor unit 63 may detect the cleanliness of the air outside the toilet bowl 2A as the air in the toilet compartment 100. The sensor unit 63 may have the same configuration as the sensor unit 31 shown in FIG. 2. In the present disclosure, "the gas has high cleanliness" means that the concentration of the specific gas to be detected is low in the gas. The sensor unit 63 outputs the cleanliness of the air in the toilet compartment 100 to the control unit 64 as a detection result.

[0075] The control unit 64 shown in FIG. 3 includes one or more processors. The processor may include at least either a general-purpose processor that reads a specific program and executes a specific function, or a dedicated processor specialized for a specific process. The dedicated processor may include an application-specific integrated circuit (ASIC). The processor may include a programmable logic device (PLD). The PLD may include a field-programmable gate array (FPGA). The control unit 64 may include at least either a system-on-a-chip (SoC) in which one or more processors cooperate, or a system-in-a-package (SiP).

[0076] The control unit 64 collects the air in the toilet compartment 100 as a sample gas or a purge gas in a storage tank provided in the gas detection system 1. The period during which the control unit 64 collects the air in the toilet compartment 100 as a sample gas or a purge gas in the storage tank is also referred to as the "collection period".

[0077] When the gas detection system 1 includes the storage tank 41 as a storage tank, the control unit 64 collects the air in the toilet room 100 into the storage tank 41 as purge gas. In the present embodiment, the control unit 64 collects the gas outside the toilet bowl 2A of the toilet 2 in the toilet room 100 into the storage tank 41 as purge gas. For example, when the blower 21A includes a fan, the control unit 64 rotates the fan of the blower 21A to draw the purge gas near the suction hole 21. The control unit 64 connects the flow path 24-1 and the flow path 24-2 to the valve 26 and controls the supply unit 51 to cause the purge gas drawn near the suction hole 21 to be sucked into the suction hole 21. The control unit 64 collects the purge gas into the storage tank 41 by sucking the purge gas into the suction hole 21.

[0078] During the first period, the control unit 64 collects the air in the toilet room 100 into the storage tank 41 as purge gas. In other words, the first period is a period in which the air in the toilet room 100 is collected into the storage tank 41 as purge gas. The length of the first period may be appropriately set in consideration of the volume of the storage tank 41 and the like. Examples of setting the first period will be described later.

[0079] When the gas detection system 1 includes the storage tank 40 as a storage tank, the control unit 64 collects the sample gas into the storage tank 40. In the present embodiment, the control unit 64 collects the gas inside the toilet bowl 2A of the toilet 2 in the toilet room 100 into the storage tank 40 as sample gas. For example, when the blower 20A includes a fan, the control unit 64 rotates the fan of the blower 20A to draw the sample gas near the suction hole 20. The control unit 64 connects the flow path 23-1 and the flow path 23-2 to the valve 25 and controls the supply unit 50 to cause the sample gas drawn into the suction hole 20 to be sucked into the suction hole 20. The control unit 64 collects the sample gas into the storage tank 40 by sucking the sample gas into the suction hole 20.

[0080] During the second period, the control unit 64 collects the air in the toilet room 100 as sample gas in the storage tank 40. In other words, the second period is a period in which the air in the toilet room 100 is collected as sample gas in the storage tank 40. The length of the second period may be appropriately set in consideration of the volume of the storage tank 40 and the like. Examples of setting the second period will be described later.

[0081] The control unit 64 supplies the sample gas stored in the storage tank 40 or the purge gas stored in the storage tank 41 to the sensor unit 31 of the chamber 30. The period during which the control unit 64 supplies the sample gas or the purge gas to the sensor unit 31 of the chamber 30 is also referred to as the "supply period". In the present embodiment, the control unit 64 controls the supply unit 50 and the supply unit 51 to alternately supply the sample gas stored in the storage tank 40 and the purge gas stored in the storage tank 41 to the chamber 30.

[0082] For example, when the control unit 64 supplies the sample gas to the chamber 30, it causes the valve 25 to connect the flow path 23-1 and the flow path 23-2. The control unit 64 supplies the sample gas in the storage tank 40 to the chamber 30 by causing the valve 25 to connect the flow path 23-1 and the flow path 23-2 and controlling the supply unit 50. Further, when the control unit 64 supplies the purge gas to the chamber 30, it causes the valve 26 to connect the flow path 24-1 and the flow path 24-2. The control unit 64 supplies the purge gas in the storage tank 41 to the chamber 30 by causing the valve 26 to connect the flow path 24-1 and the flow path 24-2 and controlling the supply unit 51. However, the control process of the control unit 64 when supplying the sample gas and the purge gas to the chamber 30 is not limited to this. For example, the control unit 64 may supply the purge gas in the storage tank 41 to the storage tank 40 from the valve 20B side by causing the valve 20B to connect the storage tank 40 and the flow path 28 and causing the valve 26 to connect the flow path 24-1 and the flow path 28. The control unit 64 may supply the sample gas in the storage tank 40 to the chamber 30 by supplying the purge gas to the storage tank 40 and pushing out the sample gas in the storage tank 40 to the flow path 23-1 side with the purge gas.

[0083] The control unit 64 acquires a voltage waveform from the sensor unit 31 by alternately supplying purge gas and sample gas to the chamber 30. The control unit 64 detects the type and concentration of the gas contained in the sample gas based on the voltage waveform. For example, the control unit 64 detects the type and concentration of the gas contained in the sample gas by machine learning on the voltage waveform acquired from the sensor unit 31. The control unit 64 may transmit the detected type and concentration of the gas to the electronic device 3 via the communication unit 62 as a detection result.

[0084] Here, the control unit 64 sets the period for collecting the air in the toilet chamber 100 as sample gas or purge gas in the storage tank and the supply period for supplying the sample gas or purge gas to the sensor unit 31 of the chamber 30 to be in different time zones. Hereinafter, an example of setting the period will be described.

[0085] <Example 1 of Period Setting> The control unit 64 may set the first period for collecting the air in the toilet chamber 100 as purge gas in the storage tank 41 and the supply period for supplying the purge gas stored in the storage tank 41 to the sensor unit 31 of the chamber 30 to be in different time zones.

[0086] As an example, the control unit 64 may periodically supply the air in the toilet compartment 100 to the sensor unit 31 in the chamber 30. The periodic period for supplying the air in the toilet compartment 100 to the sensor unit 31 may be appropriately set in consideration of the usage frequency of the toilet 2. The control unit 64 may supply the air in the toilet compartment 100 to the chamber 30 periodically through the suction hole 21 and the storage tank 41 by controlling the supply unit 51. Further, the control unit 64 may set a first period for collecting the purge gas in the storage tank 41 based on the detection result periodically output by the sensor unit 31. For example, the control unit 64 may set the time point when it is determined that the cleanliness of the air in the toilet compartment 100 exceeds a predetermined value based on the detection result of the sensor unit 31 as the start time point of the first period. The predetermined value may be appropriately set in consideration of the cleanliness of the gas that can serve as the purge gas. With such a configuration, the air in the toilet compartment 100 with high cleanliness can be collected in the storage tank 41 as the purge gas. In addition, the control unit 64 may set the supply period to be a time zone after the set first period, so that the first period and the supply period are set to be different time zones. With such a configuration, the air in the toilet compartment 100 can be collected in the storage tank 41 as the purge gas before the supply period. By collecting the purge gas before the supply period, in this embodiment, it is not necessary to prepare the purge gas using a cylinder or the like. In this embodiment, since it is not necessary to use a cylinder or the like, the probability that the device becomes larger due to the installation of a cylinder or the like and the probability that the cost increases due to the preparation of a cylinder or the like can be reduced.

[0087] As another example, the control unit 64 may set the time when a predetermined period has elapsed since the subject left the toilet room 100 as the start time of the first period based on the detection result of the sensor unit 63. The length of the predetermined period may be appropriately set assuming the time until the cleanliness of the air in the toilet room 100 exceeds a predetermined value after the subject exits the toilet room 100. The predetermined value may be appropriately set in consideration of the cleanliness of the gas that can serve as the purge gas in the gas detection system 1. In addition, the control unit 64 may set the supply period described above to be in a time zone later than the set first period, so that the first period and the supply period are in different time zones. With such a configuration, as described above, it is not necessary to use a cylinder or the like, so the probability that the apparatus becomes large due to the installation of a cylinder or the like and the probability that the cost increases due to the preparation of a cylinder or the like can be reduced.

[0088] As yet another example, the control unit 64 may set the time when it is determined that the cleanliness of the air in the toilet room 100 exceeds a predetermined value based on the detection result of the sensor unit 63 as the start time of the first period. The predetermined value may be appropriately set in consideration of the cleanliness of the gas that can serve as the purge gas. In addition, the control unit 64 may set the supply period described above to be in a time zone later than the set first period, so that the first period and the supply period are in different time zones. With such a configuration, as described above, it is not necessary to use a cylinder or the like, so the probability that the apparatus becomes large due to the installation of a cylinder or the like and the probability that the cost increases due to the preparation of a cylinder or the like can be reduced.

[0089] <Example 2 of period setting> The control unit 64 may set the second period in which the air in the toilet room 100 is collected as sample gas in the storage tank 40 and the supply period in which the sample gas stored in the storage tank 40 is supplied to the sensor unit 31 in the chamber 30 to be in different time zones.

[0090] As an example, the control unit 64 may periodically supply the air in the toilet room 100 to the sensor unit 31 in the chamber 30. The periodic period for supplying the air in the toilet room 100 to the sensor unit 31 may be appropriately set in consideration of the usage frequency of the toilet 2. The control unit 64 may control the supply unit 51 to periodically supply the air in the toilet room 100 to the chamber 30 through the suction hole 21 and the storage tank 41. Further, the control unit 64 may set a second period for collecting the sample gas in the storage tank 40 based on the detection result periodically output by the sensor unit 31. For example, the control unit 64 may set, as the second period, the period during which the gas to be detected contained in the air in the toilet room 100 exceeds a predetermined amount based on the detection result of the sensor unit 31. The predetermined amount may be appropriately set in consideration of the volume of the toilet room 100 and the like. With such a configuration, for example, the sample gas can be collected in the storage tank 40 while the subject is using the toilet 2. In addition, the control unit 64 may set a supply period for supplying the sample gas stored in the storage tank 40 to the sensor unit 31 based on the detection result periodically output by the sensor unit 31. For example, the control unit 64 may set, as the supply period, the period during which the gas to be detected contained in the air in the toilet room 100 is below a predetermined amount based on the detection result of the sensor unit 31. With such a configuration, for example, when the subject is not using the toilet 2, the sample gas in the storage tank 40 can be supplied to the sensor unit 31, and the detection of the concentration and type of the gas contained in the sample gas can be performed. Here, for example, when the time for which the subject uses the toilet 2 is short, the gas detection system 1 may not be able to collect the sample gas in the storage tank 40 and detect the type and concentration of the gas contained in the sample gas while the subject is using the toilet 2. Even in such a case, with the above-described control, the gas detection system 1 can collect the sample gas in the storage tank 40 while the subject is using the toilet 2. Further, the gas detection system 1 can perform the detection of the type and concentration of the gas contained in the sample gas using the sample gas stored in the storage tank 40 after the subject has used the toilet 2.Therefore, with the above control, even when, for example, the time during which the subject uses the toilet 2 is short, the gas detection system 1 can collect the sample gas and detect the types and concentrations of the gases contained in the sample gas.

[0091] As yet another example, the control unit 64 may set the second period based on the detection result of the sensor unit 63. For example, the control unit 64 may set the time point when a certain period of time has elapsed since detecting that the subject has sat on the toilet seat 2B based on the detection result of the sensor unit 63 as the start time point of the second period. The length of the certain period of time may be appropriately set in consideration of the time from when the subject sits on the toilet seat 2B until defecation starts. With such a configuration, the second period can be a period during which the subject is using the toilet 2 for defecation. Further, the control unit 64 may set the supply period to be a time zone after the set second period, so that the second period and the supply period are set to be in different time zones.

[0092] <Example 3 of period setting> The control unit 64 may set the first period and the second period to be in different time zones. The second period is highly likely to be a period during which the subject is using the toilet 2 for defecation. That is, during the second period, it is highly likely that the sample gas generated from the feces in the toilet bowl 2A has also leaked outside the toilet bowl 2A. In the present embodiment, by setting the first period and the second period to be in different time zones, a purge gas with a higher degree of cleanliness can be collected in the storage tank 41.

[0093] As an example, the control unit 64 may set the first period based on the subject's departure from the toilet room 100. As described above, the second period may be a period during which the subject is defecating using the toilet 2. Therefore, by setting the first period based on the subject's departure from the toilet room 100, the first period can be set in a time zone different from the second period. Specifically, the control unit 64 may set the time point when a predetermined time has elapsed since the subject left the toilet room 100 as the start time point of the first period based on the detection result of the sensor unit 63. The length of the predetermined time may be appropriately set in consideration of the time until the cleanliness of the air in the toilet room 100 exceeds a predetermined value after the subject exits the toilet room 100. The predetermined value may be appropriately set in consideration of the cleanliness of the gas that can serve as a purge gas in the gas detection system 1.

[0094] As another example, the control unit 64 may set the time point when it determines that the cleanliness of the air in the toilet room 100 exceeds a predetermined value based on the detection result of the sensor unit 63 as the start time point of the first period. The predetermined value may be appropriately set in consideration of the cleanliness of the gas that can serve as a purge gas. As described above, in the second period, the probability that the subject is defecating using the toilet 2 is high. Also, when the cleanliness of the air in the toilet room 100 exceeds a predetermined value, the probability that the subject is not using the toilet 2 is high. By setting the time point when the control unit 64 determines that the cleanliness of the air in the toilet room 100 exceeds a predetermined value as the start time point of the first period, the first period can be set in a time zone different from the second period. Instead of the sensor unit 63, the control unit 64 may set the time point when it determines that the cleanliness of the air in the toilet room 100 exceeds a predetermined value based on the detection result of the sensor unit 31 as the start time point of the first period. In this case, the control unit 64 may control the supply unit 51 to supply the air in the toilet room 100 to the chamber 30 through the suction hole 21 and the storage tank 41.

[0095] As yet another example, the control unit 64 may set the first period based on the fact that the ventilation fan 4 in the toilet room 100 is in an operating state. This example may be adopted when the ventilation fan 4 is set to be in a driven state after the subject leaves the toilet room 100. By setting the first period based on the fact that the ventilation fan 4 is in an operating state, the first period can be set in a time zone different from the second period. The control unit 64 may set the time point when it determines that the ventilation fan 4 is in an operating state, based on communication with the ventilation fan 4 via the communication unit 62, as the start time point of the first period. When the ventilation fan 4 operates, the cleanliness of the air in the toilet room 100 can be increased. Therefore, by setting the first period based on the fact that the ventilation fan 4 is in an operating state, a purge gas with a higher cleanliness can be collected.

[0096] [Operation example of gas detection system] FIG. 4 is a flowchart showing the operation of the gas detection system 1 according to the first embodiment of the present disclosure.

[0097] During the first period, the control unit 64 collects the purge gas in the storage tank 41 (step S10). An example of the details of the process of step S10 will be described later with reference to FIGS. 5 to 7. During the second period, the control unit 64 collects the sample gas in the storage tank 40 (step S11).

[0098] During the supply period, the control unit 64 alternately supplies the sample gas stored in the storage tank 40 and the purge gas stored in the storage tank 41 to the chamber 30 (step S12).

[0099] The control unit 64 obtains a voltage waveform from the sensor unit 31 by alternately supplying the purge gas and the sample gas to the chamber 30 (step S13).

[0100] The control unit 64 detects the type and concentration of the gas contained in the sample gas based on the voltage waveform obtained from the sensor unit 31 by the process of step S13 (step S14).

[0101] FIG. 5 is a flowchart showing an example of the operation during purge gas collection of the gas detection system 1 according to the first embodiment of the present disclosure. The process as shown in FIG. 5 corresponds to an example of the process of step S10 as shown in FIG. 4.

[0102] Based on the detection result of the sensor unit 63, the control unit 64 detects that the subject has exited the toilet room 100 (step S20). The control unit 64 determines whether or not a predetermined time has elapsed since the subject exited the toilet room 100 (step S21).

[0103] When the control unit 64 determines that a predetermined time has elapsed since the subject exited the toilet room 100 (step S21: Yes), the control unit 64 sets the time point when the predetermined time has elapsed since the subject exited the toilet room 100 as the start time point of the first period (step S22). On the other hand, when the control unit 64 does not determine that a predetermined time has elapsed since the subject exited the toilet room 100 (step S21: No), the control unit 64 executes the process of step S21 again.

[0104] In the process of step S23, the control unit 64 collects the air in the toilet room 100 as purge gas into the storage tank 41 during the first period.

[0105] Before executing the process of step S23, when the control unit 64 detects that the subject has entered the toilet room 100 based on the detection result of the sensor unit 63, the control unit 64 does not need to execute the process of step S23.

[0106] FIG. 6 is a flowchart showing another example of the operation during purge gas collection of the gas detection system 1 according to the first embodiment of the present disclosure. The process as shown in FIG. 6 corresponds to another example of the process of step S10 as shown in FIG. 4.

[0107] Based on the detection result of the sensor unit 63, the control unit 64 detects the cleanliness of the air in the toilet room 100 (step S30). The control unit 64 determines whether the cleanliness of the air in the toilet room 100 exceeds a predetermined value (step S31). When the control unit 64 determines that the cleanliness of the air in the toilet room 100 exceeds the predetermined value (step S31: Yes), the control unit 64 sets the point in time when it is determined that the cleanliness of the air in the toilet room 100 exceeds the predetermined value as the start point of the first period (step S32). On the other hand, when the control unit 64 determines that the cleanliness of the air in the toilet room 100 does not exceed the predetermined value (step S31: No), the process returns to the process of step S30.

[0108] In the process of step S33, the control unit 64 collects the air in the toilet room 100 into the storage tank 41 as purge gas during the first period.

[0109] In the process of step S30, the control unit 64 may detect the cleanliness of the air in the toilet room 100 based on the detection result of the sensor unit 31. In this case, the control unit 64 may supply the air in the toilet room 100 to the chamber 30 through the suction hole 21 and the storage tank 41 by controlling the supply unit 51.

[0110] FIG. 7 is a flowchart showing still another example of the operation at the time of collecting purge gas of the gas detection system 1 shown in FIG. 1. The process as shown in FIG. 7 corresponds to still another example of the process of step S10 as shown in FIG. 4.

[0111] The control unit 64 acquires a signal indicating the state of the ventilation fan 4 from the ventilation fan 4 via the communication unit 62 (step S40). The control unit 64 determines whether the ventilation fan 4 is in an operating state based on the acquired signal indicating the state of the ventilation fan 4 (step S41). When the control unit 64 determines that the ventilation fan 4 is in an operating state (step S41: Yes), for example, the point in time when it is determined that the ventilation fan 4 is in an operating state is set as the start point of the first period (step S42). On the other hand, when the control unit 64 determines that the ventilation fan 4 is not in an operating state (step S41: No), the process returns to the process of step S40.

[0112] In the process of step S43, the control unit 64 collects the air in the toilet compartment 100 as purge gas in the storage tank 41 during the first period.

[0113] Thus, in the first embodiment, the control unit 64 sets the collection period for collecting the air in the toilet compartment 100 as sample gas or purge gas in the storage tank and the supply period for supplying the sample gas or purge gas to the sensor unit 31 of the chamber 30 to be different time zones. With such a configuration, for example, when setting the first period for collecting the air in the toilet compartment 100 as purge gas in the storage tank 41 and the supply period to be different time zones, as described above, it is not necessary to prepare the purge gas using a cylinder or the like. Therefore, in the gas detection system 1 according to the present embodiment, the probability that the device becomes large-sized by installing a cylinder or the like and the probability that the cost increases by preparing a cylinder or the like can be reduced.

[0114] Therefore, according to the present embodiment, an improved gas detection system 1 can be provided.

[0115] (Second Embodiment) [Configuration Example of Gas Detection System] The gas detection system according to the second embodiment can adopt the same configuration as the gas detection system 1 shown in FIGS. 1 to 3. Hereinafter, the gas detection system 1 according to the second embodiment will be described with reference to FIGS. 1 to 3.

[0116] In the second embodiment, the control unit 64 executes the refresh process for the sensor unit 31 twice. The refresh process is a process for removing substances attached to the sensor unit 31.

[0117] In the first refresh process, the control unit 64 executes a refresh process on the sensor unit 31 by the air in the toilet chamber 100 acquired at an arbitrary timing, for example. The control unit 64 may execute the first refresh process at an arbitrary timing. The control unit 64 controls the supply unit 51 to supply the air in the toilet chamber 100 to the chamber 30 through the suction hole 21 and the storage tank 41. By supplying the air in the toilet chamber 100 to the chamber 30, the control unit 64 supplies the air in the toilet chamber 100 to the sensor unit 31. When the air in the toilet chamber 100 is supplied to the sensor unit 31, substances adhering to the sensor unit 31 can be removed to some extent.

[0118] Alternatively, in the first refresh process, the control unit 64 may execute a refresh process on the sensor unit 31 by the gas remaining in the storage tank 41. In this case, the control unit 64 controls the supply unit 51 to supply the gas remaining in the storage tank 41 to the chamber 30.

[0119] In the second refresh process, the control unit 64 executes a refresh process on the sensor unit 31 by the purge gas stored in the storage tank 41. The control unit 64 may execute the second refresh process, for example, immediately before the execution of the gas detection process by the sensor unit 31. The control unit 64 may collect the purge gas in the storage tank 41 by the process described above in the first embodiment. The cleanliness of the purge gas stored in the storage tank 41 is higher than the cleanliness of the air in the toilet chamber 100 used in the first refresh process. By executing the refresh process on the sensor unit 31 with the purge gas having a higher cleanliness, substances adhering to the sensor unit 31 can be further removed.

[0120] [Operation example of gas detection system] FIG. 8 is a flowchart showing the operation during refresh of the gas detection system 1 according to the second embodiment of the present disclosure. The control unit 64 may execute the process shown in FIG. 8 after the gas detection process, that is, after the end of the process shown in FIG. 4.

[0121] The control unit 64 executes the first refresh process on the sensor unit 31 using the air in the toilet compartment 100 (step S50).

[0122] The control unit 64 executes the process shown in any one of FIGS. 5 to 7 described above, and collects the air in the toilet compartment 100 as purge gas into the storage tank 41 (step S51).

[0123] The control unit 64 executes the refresh process on the sensor unit 31 using the purge gas stored in the storage tank 41 (step S52).

[0124] In the process of step S50, the control unit 64 may execute the first refresh process on the sensor unit 31 using the gas remaining in the storage tank 41.

[0125] Thus, in the second embodiment, after the control unit 64 executes the first refresh process on the sensor unit 31 using the air in the toilet compartment 100 or the like, the control unit 64 executes the second refresh process on the sensor unit 31 using the purge gas stored in the storage tank 41. With such a configuration, in the gas detection system 1 according to the present embodiment, it is possible to execute the refresh process on the sensor unit 31 while saving the purge gas stored in the storage tank 41.

[0126] The drawings for explaining the embodiments according to the present disclosure are schematic. The dimensional ratios and the like on the drawings do not necessarily match the actual ones.

[0127] Although the embodiments according to the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications or corrections based on the present disclosure. Therefore, it should be noted that these modifications or corrections are included in the scope of the present disclosure. For example, the functions included in each component or the like can be rearranged so as not to be logically contradictory, and a plurality of components or the like can be combined into one or divided.

[0128] For example, in the above-described embodiment, it has been described that the control unit 64 as shown in FIG. 3 controls the supply unit 50 as shown in FIG. 2 to suck the sample gas into the suction hole 20 and collect it in the storage tank 40. However, the processing of the control unit 64 when collecting the sample gas in the storage tank 40 is not limited to this. For example, the control unit 64 may control the supply unit 52 to suck the sample gas into the suction hole 20 and collect it in the storage tank 40. In this case, the control unit 64 causes the valve 20B to connect the suction hole 20 and the storage tank 40, and also causes the valve 25 to connect the flow path 23-1 and the flow path 27-1. Further, the control unit 64 controls the supply unit 52 to suck the sample gas into the suction hole 20 and collect it in the storage tank 40.

[0129] For example, in the above-described embodiment, it has been described that the control unit 64 as shown in FIG. 3 controls the supply unit 51 as shown in FIG. 2 to suck the purge gas into the suction hole 21 and collect it in the storage tank 41. However, the processing of the control unit 64 when collecting the purge gas in the storage tank 41 is not limited to this. For example, the control unit 64 may control the supply unit 52 to suck the purge gas into the suction hole 21 and collect it in the storage tank 41. In this case, the control unit 64 causes the valve 21B to connect the suction hole 21 and the storage tank 41, and also causes the valve 26 to connect the flow path 24-1 and the flow path 27-2. Further, the control unit 64 controls the supply unit 52 to suck the purge gas into the suction hole 21 and collect it in the storage tank 41.

[0130] For example, in the above-described embodiment, it has been described that the ventilation fan 4 is set to be in a driving state after the subject leaves the toilet room 100. However, the timing at which the ventilation fan 4 enters the driving state is not limited to this. The ventilation fan 4 may enter the driving state at any timing regardless of whether the subject is present or absent in the toilet room 100. In this case, when the ventilation fan 4 is in the driving state, the control unit 64 may collect the gas outside the toilet bowl 2A of the toilet 2 in the toilet room 100 into the storage tank 41 as purge gas. The control unit 64 may detect when the ventilation fan 4 is in the operating state by communicating with the ventilation fan 4 via the communication unit 62. Further, after a certain period of time has elapsed since the control unit 64 detects that the subject has sat on the toilet seat 2B based on the detection result of the sensor unit 63, the control unit 64 may collect the gas inside the toilet bowl 2A of the toilet 2 in the toilet room 100 into the storage tank 40 as sample gas.

[0131] For example, in the above-described embodiment, as shown in FIG. 3, the gas detection system 1 has been described as being one device. However, the gas detection system of the present disclosure is not limited to one device and may include a plurality of independent devices. The gas detection system of the present disclosure may have a configuration as shown in FIG. 9, for example.

[0132] As shown in FIG. 9, the gas detection system 1A includes a gas detection device 5 and a server device 6. The gas detection device 5 and the server device 6 can communicate with each other via a network 7. A part of the network 7 may be wired or wireless. The configuration of the gas detection device 5 is the same as the configuration of the gas detection system 1 shown in FIGS. 2 and 3. The server device 6 includes a storage unit 6A, a communication unit 6B, and a control unit 6C. The control unit 6C can execute the processing of the control unit 64 as shown in FIG. 3 described above. For example, the control unit 6C sets the collection period for collecting the air in the toilet room 100 into the storage tank as sample gas or purge gas and the supply period for supplying the sample gas or purge gas to the sensor unit 31 of the chamber 30 to be in different time zones.

[0133] In the present disclosure, descriptions such as "first" and "second" are identifiers for distinguishing the relevant configurations. The configurations distinguished by descriptions such as "first" and "second" in the present disclosure can have their numbers in the configuration exchanged. For example, the first storage tank can have the identifiers "first" and "second" exchanged with those of the second storage tank. The exchange of identifiers is performed simultaneously. The configurations are still distinguishable after the exchange of identifiers. The identifiers may be deleted. The configurations with the identifiers deleted are distinguished by reference signs. Based only on the descriptions of identifiers such as "first" and "second" in the present disclosure, the order of the configurations shall not be interpreted, nor shall it be used as a basis for the existence of identifiers with smaller numbers.

Description of Reference Signs

[0134] 1,1A Gas Detection System 2 Toilet 2A Toilet Bowl 2B Toilet Seat 3 Electronic Device 3A Display Unit 4 Ventilation Fan 5 Gas Detection Device 6 Server Device 6A Storage Unit 6B Communication Unit 6C Control Unit 7 Network 10 Housing 20,21 Suction Hole 20A,21A Blower 20B,21B,25,26 Valve 22 Discharge Path 23,23-1,23-2,24,24-1,24-2,27,27-1,27-2,27-3,27-4,28,29B Flow Path 30 Chamber 31 Sensor Unit (First Sensor Unit) 40 Storage Tank (First Storage Tank) 40a,40b Adsorbent 40c Wall 41 Storage Tank (Second Storage Tank) 41a,41b Adsorbent 41c Wall 50,51,52 Supply Unit 60 Circuit board 61 Memory unit 62 Communication unit 63 Sensor unit (second sensor unit) 64 Control unit 100 Toilet room (predetermined space)

Claims

1. A first sensor unit that outputs a voltage according to the concentration of a specific gas; A first suction hole for sucking a sample gas; A storage tank capable of storing the sample gas sucked from the first suction hole; A first flow path connecting the first suction hole and the storage tank; A second flow path connecting the storage tank and the first sensor unit to supply the sample gas to the first sensor unit; A second suction hole for sucking a purge gas to be supplied to the first sensor unit, comprising: The second suction hole, the first flow path, and the second flow path are configured to be connectable; A plurality of the first sensor units are respectively arranged in a plurality of divided portions of the chamber; The second flow path connects the storage tank and the chamber; A gas detection system in which an exhaust path for discharging exhaust to the outside is connected to the chamber.

2. The second suction hole and the first flow path are configured to be connectable via a first valve and a third flow path; The gas detection system according to claim 1, wherein the first valve is capable of switching the connection state between the first flow path and the third flow path.

3. The second suction hole and the second flow path are configured to be connectable via a second valve and a fourth flow path; The gas detection system according to claim 2, wherein the second valve is capable of switching the connection state between the second flow path and the fourth flow path.

4. The gas detection system according to claim 3, further comprising a control unit capable of controlling the first valve and the second valve.

5. The control unit causes the first valve to connect the first flow path and the third flow path, and causes the second valve not to connect the second flow path and the fourth flow path. The gas detection system according to claim 4.

6. The second suction hole is connected to the third flow path and the fourth flow path via a fifth flow path. The gas detection system according to any one of claims 3 to 5.

7. The gas detection system according to any one of claims 1 to 6, further comprising an adsorbent that is located between the second suction hole and the first sensor unit and adsorbs a gas that is not a detection target.

8. The gas detection system according to any one of claims 1 to 7, further comprising a supply unit located between the first suction hole and the first sensor unit.

9. A first sensor unit that outputs a voltage according to the concentration of a specific gas; A first suction hole for sucking a sample gas; A storage tank capable of storing the sample gas sucked from the first suction hole; a first flow path connecting the first suction hole and the storage tank; a second flow path connecting the storage tank and the first sensor unit and supplying the sample gas to the first sensor unit; a second suction hole for sucking a purge gas supplied to the first sensor unit; and the second suction hole, the first flow path, and the second flow path are configured to be connectable; the plurality of first sensor units are respectively arranged in a plurality of divided portions of the chamber; the second flow path connects the storage tank and the chamber; a gas detection device, wherein an exhaust path for discharging exhaust to the outside is connected to the chamber.

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