Head-mounted device, heatstroke prevention system and hydration warning system

Abstract

To provide a head mounted device that can measure a body state of a wearer with high precision, the state being required for estimating a possibility of heat attack, a heat attack prevention system, and a hydration warning system.SOLUTION: A head mounted device includes: a hat covering the head of a wearer and having air permeability; a fan arranged in the outside or inside of the hat, and blowing or sucking air such that air containing moisture due to sweat generated in the head passes a surface of the hat and is discharged to the outside; a first humidity sensor for measuring an absolute humidity of sucked air entering the fan or the hat; and a second humidity sensor located in an inner surface or outer surface of the hat, for measuring an absolute humidity of discharged air discharged from the hat or the fan.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a head-mounted device, a heatstroke prevention system, and a hydration warning system. [Background technology]

[0002] In high-temperature environments, it is necessary to prevent heatstroke. Conventionally, devices worn by workers to prevent heatstroke in workers engaged in work at construction sites and the like have been known. For example, Patent Document 1 describes a helmet equipped with a temperature sensor and a humidity sensor. The helmet in Patent Document 1 allows a manager to grasp the situation inside the helmet, making it possible to contact the worker in the event of an abnormality. Non-Patent Document 1 describes signs that indicate the need to stop exposure to heat. Non-Patent Document 2 describes the symptoms of heatstroke. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-115275 [Non-patent literature]

[0004] [Non-Patent Document 1] "Preventing Heatstroke," Ministry of Health, Labor and Welfare, Labor Standards Bureau, Prefectural Labor Bureaus, Labor Standards Inspection Offices, April 2013 [Non-patent document 2] "Preventing Heatstroke in the Workplace," Health Section, Labor Standards Department, Tokyo Labor Bureau, February 2017 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the helmet in Patent Document 1 simply measures the temperature and humidity inside the helmet. Therefore, there are limitations to accurately detecting the physical condition of the worker wearing the helmet, which is necessary for estimating the risk of heatstroke, particularly the amount of water loss within the worker's body. Therefore, it is difficult to improve the accuracy of estimating the risk of heatstroke. Furthermore, heatstroke can occur not only in workers but also in ordinary people who engage in outdoor activities and exercise. Therefore, it is desirable for the helmet to be wearable by ordinary people, not just in helmets.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a head-mounted device, a heatstroke prevention system, and a hydration warning system that can measure the wearer's physical condition with greater accuracy, which is necessary to estimate the possibility of heatstroke. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, one embodiment of the head-mounted device of the present disclosure comprises a breathable hat that covers the head of a wearer, a fan that is positioned on the outside or inside of the hat and blows or sucks air so that air passes through the surface of the hat and enters the inside of the hat, and air containing water vapor from sweat generated on the head passes through the surface of the hat and is exhausted to the outside, a first humidity sensor that measures the absolute humidity of the intake air entering the fan or the hat, and a second humidity sensor that is positioned on the inside or outside surface of the hat and measures the absolute humidity of the exhaust air exiting the hat or the fan.

[0008] In a preferred embodiment of the head-mounted device, an intermediate covering member is provided in the gap between the wearer's head and the hat, and has a through-hole.

[0009] In a preferred embodiment of the head-mounted device, the first humidity sensor measures the temperature and relative humidity of the intake air, and the second humidity sensor measures the temperature and relative humidity of the exhaust air.

[0010] In a preferred embodiment of the head-mounted device, the fan blows air at a volume such that the temperature of the discharged air is equal to or higher than the dew point temperature of the discharged air.

[0011] In a preferred embodiment, the head-mounted device includes a body temperature sensor for measuring the body temperature of the wearer.

[0012] In a preferred embodiment of the head-mounted device, the body temperature sensor measures core body temperature.

[0013] In a preferred embodiment, the head-mounted device includes a heart rate sensor for measuring the heart rate of the wearer.

[0014] A preferred embodiment of the head-mounted device includes an environmental sensor for measuring the wet bulb temperature and black bulb temperature around the wearer.

[0015] In a preferred embodiment, the head-mounted device includes an airflow measuring device for measuring the airflow of the fan.

[0016] In a preferred embodiment of the head-mounted device, the airflow measuring device includes an airflow sensor provided at the air inlet or outlet of the fan.

[0017] In a preferred embodiment of the head-mounted device, the airflow measurement device includes a pressure sensor for measuring the differential pressure of the fan, and is equipped with a control device for calculating the airflow of the fan based on information obtained from the pressure sensor.

[0018] In a preferred embodiment of the head-mounted device, the airflow measuring device includes a detection mechanism that detects the power supply voltage that drives the fan, and is equipped with a control device that calculates the airflow of the fan based on information obtained from the detection mechanism.

[0019] In a preferred embodiment of the head-mounted device, the device comprises a control device that calculates the amount of sweat produced by the wearer based on information obtained from the first humidity sensor and the second humidity sensor.

[0020] A desirable aspect of the head-worn device is equipped with a salinity concentration sensor for measuring the salinity concentration of the wearer's sweat, and a control device for calculating the amount of salt loss of the wearer based on information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor.

[0021] In a preferred embodiment, the head-mounted device includes an alarm device that issues an alarm when the change in the amount of sweating satisfies a predetermined condition.

[0022] In a preferred embodiment, the head-mounted device includes an alarm device that issues an alarm when the change in the amount of salt loss satisfies a predetermined condition.

[0023] A heatstroke prevention system according to one embodiment of the present disclosure comprises the head-mounted device described above and a management device, wherein the head-mounted device comprises a communication device that transmits information obtained from the first humidity sensor and the second humidity sensor via wireless communication, and the management device receives information from the communication device and stores the amount of sweat of the wearer calculated by the control device.

[0024] A desirable embodiment of the heatstroke prevention system is provided with an alarm device that issues an alarm to the wearer or a manager when the change in the amount of sweating meets a predetermined condition.

[0025] A desirable embodiment of a heatstroke prevention system comprises the above-mentioned head-mounted device and a management device, wherein the head-mounted device comprises a communication device that transmits information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor via wireless communication, and the management device receives information from the communication device and stores the amount of salt loss of the wearer calculated by the control device.

[0026] A desirable embodiment of the heatstroke prevention system includes an alarm device that issues an alarm to the wearer or a manager when the change in the amount of salt loss satisfies a predetermined condition.

[0027] A hydration warning system according to one embodiment of the present disclosure comprises the head-mounted device described above and a management device, wherein the head-mounted device comprises a communication device that transmits information obtained from the first humidity sensor and the second humidity sensor via wireless communication, and the management device receives information from the communication device and stores the amount of sweat of the wearer calculated by the control device.

[0028] In a preferred embodiment, the hydration warning system includes an alarm device that issues an alarm to the wearer or a manager when the change in the amount of sweating meets a predetermined condition.

[0029] A hydration warning system according to one embodiment of the present disclosure comprises the head-mounted device described above and a management device, wherein the head-mounted device comprises a communication device that transmits information obtained from the salt concentration sensor, the first humidity sensor, and the second humidity sensor via wireless communication, and the management device receives information from the communication device and stores the amount of salt loss of the wearer calculated by the control device.

[0030] In a preferred embodiment, the hydration warning system includes an alarm device that issues an alarm to the wearer or a manager when the change in the amount of salt loss satisfies a predetermined condition. [Effects of the Invention]

[0031] According to the present disclosure, it is possible to provide a head-mounted device, a heatstroke prevention system, and a hydration warning system that can measure the physical condition of the wearer with higher accuracy, which is necessary to estimate the possibility of heatstroke. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a schematic diagram of a heatstroke prevention system according to a first embodiment. [Figure 2] FIG. 2 is a schematic diagram of a heatstroke prevention system according to the second embodiment. [Figure 3] FIG. 3 is a schematic diagram of a sensor unit according to the second embodiment. [Figure 4]FIG. 4 is a schematic diagram of a heatstroke prevention system according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the modes for carrying out the present disclosure (hereinafter referred to as embodiments). Furthermore, the components in the following embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the following embodiments can be combined as appropriate.

[0034] (First embodiment) FIG. 1 is a schematic diagram of a heatstroke prevention system according to a first embodiment. The heatstroke prevention system 1 of this embodiment is a system for preventing the onset of heatstroke in workers and the like. The heatstroke prevention system 1 is applied to workers at construction sites, for example. The heatstroke prevention system 1 is also a hydration warning system 1 that warns the worker that he or she should hydrate, instructs the worker to hydrate, or prompts or instructs the worker to take a break. As shown in FIG. 1, the heatstroke prevention system 1 includes a head-mounted device 10 and a management unit 9.

[0035] The head-worn device 10 is a device worn on the head of a worker. In the following description, a person wearing the head-worn device 10 will be referred to as a "wearer." For example, the head-worn device 10 in this embodiment is a hat. As shown in FIG. 1 , the head-worn device 10 includes a head covering member 2, an intermediate covering member 3, a sensor unit 4, a fan 6, a battery 16, a first humidity sensor 52, a second humidity sensor 54, an airflow sensor 56, an environment sensor 58, a salinity concentration sensor 72, a body temperature sensor 74, a heart rate sensor 76, a control device 11, an alarm device 12, a communication device 13, and an antenna 14.

[0036] The head covering member 2 is a hemispherical member that covers the wearer's head. The head covering member 2 is breathable. Sweat produced on the wearer's head becomes water vapor and passes through the head covering member 2 without being blocked by the head covering member 2. The head covering member 2 comprises a main body 20 and a flange 21. The main body 20 is made of, for example, cloth. The flange 21 is formed integrally with the main body 20 and protrudes from a lower end 201 of the main body 20 in a direction away from the wearer. In the following description, the area outside the approximately hemispherical area surrounded by the head covering member 2 is referred to as the outside E.

[0037] The intermediate covering member 3 is a member that faces the wearer's head. The intermediate covering member 3 is provided in the gap between the wearer's head and the head covering member 2. The intermediate covering member 3 may be detachable from the head covering member 2. The intermediate covering member 3 is formed, for example, from a synthetic resin. The intermediate covering member 3 has a plurality of through holes 31 and covers part of the wearer's head. Sweat generated on the wearer's head becomes water vapor and passes through the intermediate covering member 3 without being blocked by the intermediate covering member 3. The intermediate covering member 3 may cover the entire head, in which case the intermediate covering member 3 is formed from a moisture-permeable material.

[0038] The sensor unit 4 includes a housing 42, a pipe member 44, a support member 46, and a subunit 7. The fan 6, the first humidity sensor 52, the second humidity sensor 54, the airflow sensor 56, the environment sensor 58, the salinity concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, the control device 11, the alarm device 12, the communication device 13, the antenna 14, and the battery 16 are provided in the sensor unit 4.

[0039] The housing 42 is attached to the outer surface of the head covering member 2. The housing 42 has an air intake 421 for drawing in air and an air outlet 422 for blowing out air. On the outside of the housing 42, near the air intake 421, a first humidity sensor 52, an environment sensor 58, and an antenna 14 are attached. Inside the housing 42, a fan 6, an air flow sensor 56, a control device 11, an alarm device 12, a communication device 13, and a battery 16 are attached. In the first embodiment, the air flow sensor 56 is attached to the air outlet side of the fan 6. The air flow sensor 56 may also be attached to the air inlet side of the fan 6.

[0040] One end 441 of the tubular member 44 is arranged outside E of the head covering member 2. One end 441 of the tubular member 44 is connected to the air outlet 422 of the housing 42. The other end 442 of the tubular member 44 is arranged inside the head covering member 2. The other end 442 of the tubular member 44 is connected to the lower end of the inside of the head covering member 2.

[0041] The support member 46 is fixed to the housing 42. The support member 46 is provided along the inner surface of the intermediate covering member 3, extending from the lower end of the head covering member 2 upward. The head covering member 2 and the intermediate covering member 3 are sandwiched between the support member 46 and the housing 42. A second humidity sensor 54 is attached to the upper end of the support member 46.

[0042] The subunit 7 is, for example, a plate-shaped member. A salinity concentration sensor 72, a body temperature sensor 74, and a heartbeat sensor 76 are attached to one surface of the subunit 7. The subunit 7 is attached to the inner surface of the intermediate covering member 3 so that the surface on which the salinity concentration sensor 72, the body temperature sensor 74, and the heartbeat sensor 76 are attached faces the wearer's head. The subunit 7 is connected to the housing 42. The subunit 7 is connected to the housing 42 by a cable 78.

[0043] The housing 42 is preferably detachable from the head covering 2. The subunit 7 is preferably detachable from the intermediate covering 3. The sensor unit 4 is preferably detachable from the head covering 2 and the intermediate covering 3.

[0044] The fan 6 is provided in the sensor unit 4. The fan 6 is disposed inside the housing 42. In this embodiment, the fan 6 guides air drawn in from an air intake 421 of the housing 42 to the pipe member 44 via an air outlet 422. The fan 6 sends air from one end 441 to the other end 442 of the pipe member 44. In other words, the fan 6 is located at the upstream end of the pipe member 44. Air enters the housing 42 from the outside E, passes through the inside of the pipe member 44 and the head covering member 2, passes through the surface of the head covering member 2, and is discharged to the outside E. When the wearer sweats, water vapor is supplied inside the head covering member 2. Air containing water vapor from the sweat passes through the surface of the head covering member 2 and is discharged to the outside E.

[0045] The airflow rate of the fan 6 is measured by an airflow sensor 56. The fan 6 can be adjusted manually or by a control circuit included in the control device 11 (described later) so that the airflow rate is a predetermined value. The fan 6 is adjusted to blow air at a rate that will cause the temperature of the exhaust air leaking from the surface of the head covering member 2 to be equal to or higher than the dew point temperature of the exhaust air. In other words, the fan 6 is adjusted to blow air at a rate that will not cause condensation on the surrounding area of ​​the exhaust air. The minimum airflow rate of the fan 6 is preferably set to a rate that will cause the exhaust air to be equal to or higher than the dew point temperature. This is because humidity sensors generally cannot measure the humidity of air with a relative humidity higher than 100% (air humidity below the dew point temperature). To make the relative humidity of the exhaust air equal to or lower than 100%, the control device 11 simply increases the airflow rate of the fan 6 so that the temperature measured by the second humidity sensor 54 (described later) is equal to or higher than the dew point temperature. When used in a typical work environment where the relative humidity of the exhaust air is not 100% (an environment where condensation does not occur on objects around the exhaust air), the exhaust air will be above the dew point even if the airflow rate of the fan 6 is simply set manually to a desired airflow rate based on the wearer's tolerance to heat and sweat rate. Therefore, the second humidity sensor 54 described below can accurately measure absolute humidity. The minimum airflow rate of the fan 6 is preferably 0.01 L / min or more so that the air on the surface of the second humidity sensor 54 is replaced. The airflow rate of the fan 6 is more preferably 0.01 L / min or more and 500 L / min or less.

[0046] The battery 16 supplies power to the fan 6, the first humidity sensor 52, the second humidity sensor 54, the body temperature sensor 74, the heart rate sensor 76, the environment sensor 58, the control device 11, the alarm device 12, the communication device 13, and the antenna 14. The control device 11, the alarm device 12, the communication device 13, and the antenna 14 may be formed on an integrated substrate.

[0047] The first humidity sensor 52 is a sensor for measuring the absolute humidity of the intake air entering the pipe member 44 (hereinafter referred to as the first absolute humidity). Absolute humidity is the amount of water vapor contained in air per unit volume. The first humidity sensor 52 is located upstream of the fan 6. The first humidity sensor 52 is located outside E. For example, the first humidity sensor 52 is attached to the outer surface of the housing 42. The first humidity sensor 52 measures the temperature and relative humidity of the air in the outside E.

[0048] The second humidity sensor 54 is a sensor for measuring the absolute humidity of the exhaust air coming out from the surface of the head covering member 2 (hereinafter referred to as the second absolute humidity). The second humidity sensor 54 is located downstream of the fan 6. The second humidity sensor 54 is located inside the head covering member 2. For example, the second humidity sensor 54 is attached to the inner surface 202 of the main body 20 of the head covering member 2. The second humidity sensor 54 may also be attached to the outer surface of the main body 20. The second humidity sensor 54 measures the temperature and relative humidity of the air inside the head covering member 2.

[0049] The air volume sensor 56 is a sensor for measuring the air volume of the fan 6. The air volume sensor 56 is attached to the air outlet side of the fan 6. The air volume sensor 56 may also be attached to the air inlet side of the fan 6. The air volume measurement device for measuring the air volume of the fan 6 is not limited to the air volume sensor 56. The air volume measurement device may include a pressure sensor for measuring the differential pressure of the fan 6. The air volume of the fan 6 is calculated by the control device 11, which will be described later, based on information obtained from the pressure sensor. The air volume measurement device may include a detection mechanism for detecting the power supply voltage that drives the fan 6. The air volume of the fan 6 is calculated by the control device 11, which will be described later, based on information obtained from the detection mechanism.

[0050] The environmental sensor 58 is a sensor that measures the wet-bulb temperature, dry-bulb temperature, and black-bulb temperature around the wearer. The environmental sensor 58 is attached to the outer surface of the housing 42, as shown in FIG.

[0051] The salinity concentration sensor 72 is a sensor for measuring the salinity concentration of the wearer's sweat. The salinity concentration sensor 72 is attached to the subunit 7. The salinity concentration sensor 72 is in contact with the wearer. The salinity concentration sensor 72 is preferably in contact with the wearer's skin. It is more preferable to attach the salinity concentration sensor 72 so that it is in contact with the wearer's forehead.

[0052] The body temperature sensor 74 is a sensor that measures the body temperature of the wearer. The body temperature sensor 74 is attached to the subunit 7. The body temperature sensor 74 is in contact with the wearer. It is more preferable that the body temperature sensor 74 be able to measure the wearer's deep body temperature. Indicators of deep body temperature include oral temperature, rectal temperature, and tympanic temperature. When the body temperature sensor 74 measures deep body temperature, the attachment position of the body temperature sensor 74 is adjusted as appropriate.

[0053] The heart rate sensor 76 is a sensor that measures the heart rate of the wearer. The heart rate sensor 76 is attached to the subunit 7. The heart rate sensor 76 is in contact with the wearer. The heart rate sensor 76 is preferably in contact with the temples of the wearer.

[0054] The control device 11 is a computer, and includes, for example, a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), an input interface, and an output interface. The control device 11 is electrically connected to the first humidity sensor 52, the second humidity sensor 54, the airflow sensor 56, the salinity concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environmental sensor 58, and receives their measured values. The control device 11 calculates medical parameters based on information obtained from each sensor. For example, the control device 11 calculates the amount of sweating as the medical parameters. The control device 11 preferably calculates sweating rate fluctuations, core body temperature fluctuations, and heart rate intervals. Furthermore, the control device 11 preferably indexes the risk of heatstroke in the working environment and the individual wearer based on the information obtained from each sensor and the calculated medical parameters, and controls the alarm device 12 or the communication device 13 based on the index. The control device 11 is also electrically connected to the fan 6 and may control the airflow of the fan 6. The control device 11 is mounted inside the housing 42 .

[0055] The control device 11 stores information about the wearer, such as the wearer's weight, age, work location, and work process. For example, the control device 11 can obtain information about the wearer stored in a management device 91 (described later) via the communication device 13. Alternatively, information about the wearer may be directly input to the control device 11 before work.

[0056] The control device 11 calculates the first absolute humidity based on the temperature and relative humidity of the intake air received from the first humidity sensor 52. There are various approximation formulas for estimating absolute humidity from relative humidity, but here we will estimate it using the relatively commonly used Tetens formula, and define the first absolute humidity as X [g / m 3 ], the intake air temperature is t A [K], relative humidity of intake air is RH A [%], the saturated water vapor pressure of the intake air is e A When [hPa] is used, the control device 11 obtains X from the following formulas (1) and (2).

[0057]

number

[0058]

number

[0059] The control device 11 calculates the mass of moisture entering the tubular member 44 per unit time based on the first absolute humidity (X) and the air volume of the fan 6 received from the air volume sensor 56. The mass of moisture entering the tubular member 44 per unit time is A [g / min], and the air volume of the fan 6 is V [m 3 / min], the control device 11 obtains A from the following formula (3).

[0060]

number

[0061] The control device 11 calculates the second absolute humidity based on the temperature and relative humidity of the exhaust air received from the second humidity sensor 54. The second absolute humidity is expressed as Y [g / m 3 ], the temperature of the discharge air is t B [K], relative humidity of the exhaust air is RH B [%], saturated water vapor pressure of exhaust air is e B When [hPa] is used, the control device 11 obtains Y from the following formulas (4) and (5).

[0062]

number

[0063]

number

[0064] The control device 11 calculates the sum of the mass of moisture leaking from the surface of the head covering member 2 per unit time based on the second absolute humidity (Y) and the airflow rate of the fan 6. If this sum of the mass of moisture is B [g / min], the control device 11 obtains B from the following formula (6).

[0065]

number

[0066] If the mass of water evaporated from the wearer's head per unit time is C [g / min], the control device 11 obtains C from the following formula (7). In the following description, the mass of water evaporated from the wearer's head per unit time (C) is referred to as the amount of sweat.

[0067]

number

[0068] The control device 11 calculates and stores the amount of sweating at predetermined intervals. The control device 11 determines whether or not the wearer is likely to suffer from heatstroke based on the change in the amount of sweating. The control device 11 determines that the wearer is likely to suffer from heatstroke when the change in the amount of sweating satisfies a predetermined condition. For example, the control device 11 stores a predetermined threshold value for the amount of sweating, and determines that the wearer is likely to suffer from heatstroke when the amount of sweating exceeds the threshold value. Alternatively, the control device 11 stores a predetermined threshold value and a threshold number of times for the amount of sweating, and determines that the wearer is likely to suffer from heatstroke when the number of times the amount of sweating exceeds the threshold value exceeds the threshold number of times.

[0069] Alternatively, the control device 11 accumulates the amount of sweating and determines that the wearer is at risk of heatstroke if the accumulated amount of sweating exceeds a threshold. In this case, the threshold is, for example, a mass equivalent to 1.5% of the wearer's body weight (see Non-Patent Document 1). The amount of weight loss of the wearer can be measured by the amount of sweating of the whole body of the wearer. To prevent heatstroke, it is preferable to set the threshold to a value smaller than the above-mentioned threshold. The control device 11 can calculate the amount of sweating of the head, but by storing in advance a correlation between the amount of sweating of the head and the amount of sweating of the whole body, the amount of sweating of the whole body (amount of weight loss) can be estimated from the amount of sweating of the head. Alternatively, the control device 11 stores a threshold for the amount of sweating accumulated within a predetermined time period, and determines that the wearer is at risk of heatstroke if the amount of sweating accumulated within the predetermined time period exceeds the threshold. Alternatively, the control device 11 stores a first threshold value related to the amount of sweating accumulated within a predetermined time period and a second threshold value related to the wet-bulb temperature (or dry-bulb temperature) around the wearer, and determines the possibility of the wearer suffering from heatstroke based on the first and second threshold values. For example, the control device 11 determines that the wearer is likely to suffer from heatstroke when the wet-bulb temperature exceeds the second threshold value and the amount of sweating accumulated within a predetermined time period is lower than the first threshold value.

[0070] The control device 11 determines that the wearer should replenish fluids when the change in the amount of sweating satisfies a predetermined condition. For example, the control device 11 stores a predetermined threshold value for the amount of whole-body sweating, and determines that the wearer should replenish fluids when the amount of whole-body sweating exceeds the threshold value. The control device 11 calculates the amount of fluids that the wearer should replenish based on the information on the amount of sweating. For example, the amount of fluids that the control device 11 calculates that the wearer should replenish is the amount of fluids that corresponds to the amount of whole-body sweating. Note that the amount of fluids that the control device 11 calculates that the wearer should replenish may be an amount different from the amount of fluids that corresponds to the amount of whole-body sweating.

[0071] The control device 11 calculates the amount of salt loss contained in sweat evaporating from the wearer's head per unit time based on the amount of sweating and the salt concentration of sweat received from the salt concentration sensor 72. The control device 11 calculates and stores the amount of salt loss at predetermined intervals. The control device 11 determines whether the wearer is likely to suffer from heatstroke based on the trend in the amount of salt loss. The control device 11 determines that the wearer is likely to suffer from heatstroke when the trend in the amount of salt loss satisfies a predetermined condition. For example, the control device 11 stores a predetermined threshold value for the amount of salt loss, and determines that the wearer is likely to suffer from heatstroke when the amount of salt loss exceeds the threshold value. Alternatively, the control device 11 stores a predetermined threshold value and a threshold number of times for the amount of salt loss, and determines that the wearer is likely to suffer from heatstroke when the number of times the amount of salt loss exceeds the threshold value exceeds the threshold number. The control device 11 may also store an average salt concentration in sweat. The control device 11 may also calculate the amount of salt loss of the wearer based on the average salt concentration in sweat. The average salinity concentration of sweat is a predetermined value stored in advance in the control device 11. The average salinity concentration of sweat may be calculated, for example, by measuring the salinity concentration of sweat a predetermined number of times in advance for each wearer and averaging the measured values, or a commonly known value of the salinity concentration of sweat may be used without installing the salinity concentration sensor 72. The commonly known average salinity concentration of sweat is 0.3% or more and 0.4% or less.

[0072] The control device 11 determines whether or not the wearer is likely to suffer from heatstroke based on the change in body temperature. For example, if the body temperature received from the body temperature sensor 74 during the wearer's break does not return to the body temperature before the start of work, the control device 11 determines that the wearer is likely to suffer from heatstroke (see Non-Patent Document 1).

[0073] The control device 11 determines whether or not the wearer is likely to suffer from heatstroke based on the change in heart rate. For example, the control device 11 determines that the wearer is likely to suffer from heatstroke if the heart rate per minute exceeds a value obtained by subtracting the wearer's age from 180 for several minutes. Alternatively, the control device 11 determines that the wearer is likely to suffer from heatstroke if the heart rate per minute one minute after the peak of the wearer's work intensity exceeds 120 (see Non-Patent Document 1).

[0074] The control device 11 calculates a heat index (WBGT: Wet Bulb Globe Temperature) based on information measured by the environmental sensor 58. The control device 11 stores the wearer's work process and therefore knows whether the wearer is outdoors or indoors. When the wearer is outdoors, the control device 11 calculates the heat index based on the wet bulb temperature, dry bulb temperature, and black bulb temperature. When the wearer is indoors, the control device 11 calculates the heat index based on the wet bulb temperature and black bulb temperature. The control device 11 can also use the heat index to determine whether the wearer is at risk of heat stroke.

[0075] The control device 11 may also combine the amount of sweat with information obtained from the salinity concentration sensor 72, body temperature sensor 74, heart rate sensor 76, and environmental sensor 58 to determine whether the wearer is at risk of heatstroke.

[0076] The alarm device 12 is a device that makes the wearer aware that he or she may suffer from heatstroke. The alarm device 12 is attached inside the housing 42. When the control device 11 determines that the wearer may suffer from heatstroke, the alarm device 12 issues an alarm. The type of alarm is not particularly limited. Examples of the alarm include sound, light, and vibration. The alarm device 12 is also a device that makes the wearer aware that he or she needs to replenish at least one of fluids and salt. When the control device 11 determines that the wearer should replenish at least one of fluids and salt, the alarm device 12 issues an alarm. The type of alarm is not particularly limited. Examples of the alarm include sound, light, and vibration. For example, when the control device 11 determines that the wearer should replenish at least one of fluids and salt, the alarm device 12 displays the amount of at least one of fluids and salt that the wearer should replenish, calculated by the control device 11. For example, when the control device 11 determines that the wearer should replenish at least one of fluid and salt, the warning device 12 instructs the wearer by voice or the like to take in the amount of at least one of fluid and salt that the wearer should replenish, as calculated by the control device 11. Furthermore, the warning device 12 may use in combination an instruction to replenish at least one of fluid and salt, and an instruction to take a break based on, for example, the continuous working time.

[0077] The communication device 13 and the antenna 14 are devices for transmitting information obtained by the control device 11 to the management unit 9. The communication device 13 is attached inside the housing 42. The antenna 14 is attached to the outer surface of the housing 42.

[0078] The management unit 9 is where a manager who monitors the wearers is located. The management unit 9 includes a management device 91 and an alarm device 92. The management device 91 receives information from multiple head-worn devices 10. The management device 91 stores information such as the work locations, work processes, and ages of multiple wearers.

[0079] The management device 91 stores the amount of sweating and the amount of salt loss obtained from the control device 11 and information obtained from each sensor. The management device 91 determines whether or not the wearer is likely to suffer from heatstroke based on trends in the amount of sweating, the amount of salt loss, body temperature, heart rate, and heat index. The management device 91 determines whether or not the wearer should replenish at least one of fluids and salt based on trends in the amount of sweating, the amount of salt loss, body temperature, heart rate, and heat index. The specific method of determination may be the same as or different from the method of determination by the control device 11.

[0080] The alarm device 92 is a device for making a manager aware that the wearer may suffer from heatstroke. When the management device 91 determines that the wearer may suffer from heatstroke, the alarm device 92 issues an alarm to the manager. The alarm device 92 is a device for making a manager aware that the wearer should replenish at least one of fluids and salt. When the management device 91 determines that the wearer should replenish at least one of fluids and salt, the alarm device 92 issues an alarm to the manager. As with the alarm device 12, the type of alarm is not particularly limited. Furthermore, the alarm device 92 may issue a command to replenish at least one of fluids and salt, in combination with an instruction to take a break based on, for example, the continuous working time.

[0081] The materials of the head covering member 2 and the intermediate covering member 3 are merely examples and are not particularly limited. Also, the head-mounted device 10 does not necessarily have to include the intermediate covering member 3.

[0082] In the head-mounted device 10, the air from the outside E does not necessarily have to enter through the air intake 421 of the housing 42. The air from the outside E may enter through the surface of the head covering member 2 and be discharged through the air intake 421. In such a case, it is preferable that the second humidity sensor 54 is disposed near the air intake 421.

[0083] The number of second humidity sensors 54 provided in the head-mounted device 10 does not necessarily have to be one. For example, a second humidity sensor 54 may be disposed near each of the plurality of through-holes 31 of the intermediate covering member 3. In such a case, it is preferable that the control device 11 calculates the amount of sweating based on the average of the measurement results of the plurality of second humidity sensors 54.

[0084] In this embodiment, the head-mounted device 10 has one tubular member 44, but may have multiple tubular members 44. The tubular member 44 may be branched so as to have one end 441 and multiple other ends 442.

[0085] When the airflow rate of fan 6 is automatically adjusted by control device 11, control device 11 may increase the airflow rate of fan 6 when the temperature of the exhaust air becomes lower than the dew point temperature. Control device 11 may also increase the airflow rate of fan 6 as the amount of sweat increases. Fan 6 may also blow air from air outlet 422 to air intake 421.

[0086] The head-mounted device 10 may not include the air volume sensor 56, the salinity concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environmental sensor 58. Instead of the air volume sensor 56, the head-mounted device 10 may include a pressure sensor that measures the differential pressure of the fan 6 or a detection mechanism that detects the power supply voltage that drives the fan 6. The head-mounted device 10 may measure the air volume in any way as long as it is possible to measure the air volume of the fan 6. In this embodiment, the head-mounted device 10 converts the air volume setting value by the control device 11 into the air volume measured by the air volume measuring device as V [m 3 / min], but the air volume set by the control device 11 is V [m 3 / min]. That is, the head-mounted device 10 does not necessarily have to measure the airflow rate of the fan 6.

[0087] The head-mounted device 10 is required to include at least a first humidity sensor 52 and a second humidity sensor 54 as sensors. The first humidity sensor 52 and the second humidity sensor 54 do not necessarily have to measure temperature and relative humidity, but only need to measure absolute humidity. For example, the first humidity sensor 52 and the second humidity sensor 54 may be moisture meters (infrared moisture meters) that use light (near-infrared light). Moisture has the property of absorbing near-infrared light of a specific wavelength. The infrared moisture meter measures absolute humidity based on the magnitude of absorbance. The first humidity sensor 52 does not necessarily have to be disposed on the outer surface of the housing 42. The second humidity sensor 54 does not necessarily have to be attached to the support member 46. The second humidity sensor 54 may be attached, for example, near the through-hole 31 of the intermediate covering member 3. The environmental sensor 58 does not necessarily have to be disposed on the outer surface of the housing 42. The environmental sensor 58 may be attached, for example, to the outer surface of the head covering member 2.

[0088] The control device 11, the alarm device 12, and the communication device 13 do not necessarily have to be arranged inside the housing 42. The control device 11, the alarm device 12, and the communication device 13 may be attached, for example, to the inner surface 211 of the flange 21. The antenna 14 does not necessarily have to be arranged on the outer surface of the housing 42. The antenna 14 may be attached, for example, to the outer surface of the flange 21. The salinity concentration sensor 72, the body temperature sensor 74, and the heartbeat sensor 76 do not necessarily have to be arranged in the subunit 7. The salinity concentration sensor 72, the body temperature sensor 74, and the heartbeat sensor 76 may be attached, for example, to the inner surface of the intermediate covering member 3.

[0089] The head-mounted device 10 may include sensors other than those described above. For example, the head-mounted device 10 may include a cerebral blood flow sensor that measures the wearer's cerebral blood flow. A known cerebral blood flow sensor is a device that uses near-infrared light to measure brain function non-invasively from the scalp. Such a device is called a near-infrared spectroscopy (NIRS) brain measurement device. The head-mounted device 10 may also include an acceleration sensor, which allows the head-mounted device 10 to detect dizziness, etc., of the wearer.

[0090] The head-mounted device 10 does not have to be equipped with the communication device 13 and the antenna 14. Even in such a case, the head-mounted device 10 is equipped with the warning device 12, so the wearer can be aware that he or she may suffer from heat stroke.

[0091] The head-worn device 10 does not necessarily have to include the control device 11. In such a case, information measured by the first humidity sensor 52, the second humidity sensor 54, the airflow sensor 56, the salinity concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environmental sensor 58 is transmitted to the management device 91 via the communication device 13. The management device 91 then calculates the amount of sweating based on the above-mentioned formulas (1) to (7) and determines whether or not the wearer is at risk of heat stroke. Note that even when the head-worn device 10 includes the control device 11, the management device 91 may calculate the amount of sweating.

[0092] The control device 11 and the management device 91 may accumulate information measured by each sensor in the past and change the criteria for determining whether or not there is a possibility of heatstroke based on that information. The control device 11 and the management device 91 may also have artificial intelligence (AI). By having the AI ​​learn the accumulated information, it is possible to improve the accuracy of determining whether or not there is a possibility of heatstroke.

[0093] The head-mounted device 10 may not include the alarm device 12. The management unit 9 may not include the alarm device 92. However, it is preferable that the heatstroke prevention system 1 includes at least one of the alarm device 12 and the alarm device 92.

[0094] As described above, the head-worn device 10 includes the head covering member 2, the fan 6, the first humidity sensor 52, and the second humidity sensor 54. The head covering member 2 covers the wearer's head and is breathable. The fan 6 is disposed inside or outside the head covering member 2 and blows or sucks air. The first humidity sensor 52 is a device for measuring the absolute humidity of intake air entering the fan 6 or the head covering member 2. The second humidity sensor 54 is a device for measuring the absolute humidity of exhaust air exiting the head covering member 2 or the fan 6.

[0095] This allows the head-mounted device 10 to obtain the amount of sweating on the wearer's head based on the information obtained from the first humidity sensor 52 and the second humidity sensor 54. As a result, the head-mounted device 10 can measure with higher accuracy the physical condition of the wearer as a worker, which is necessary for estimating the possibility of heatstroke.

[0096] The head-mounted device 10 also includes a sensor unit 4. The sensor unit 4 has a housing 42, a fan 6, a first humidity sensor 52, and a second humidity sensor 54. The fan 6, the first humidity sensor 52, and the second humidity sensor 54 are supported by the housing 42. As a result, for example, by attaching the sensor unit 4 to the head covering member 2, it becomes possible to obtain the amount of sweating on the wearer's head based on information obtained from the first humidity sensor 52 and the second humidity sensor 54. The head-mounted device 10 can more easily measure the physical condition of the wearer as a worker, which is necessary to estimate the possibility of heatstroke.

[0097] In addition, in the head-mounted device 10, the sensor unit 4 is detachable from the head covering member 2. This allows, for example, the head covering member 2 to be washed with water or the like.

[0098] The head-mounted device 10 also includes an intermediate covering member 3. The intermediate covering member 3 is provided in the gap between the wearer's head and the head covering member 2, and has a through-hole 31. This makes it possible to prevent the head covering member 2 from being deformed by the weight of the sensor unit 4 without impairing the breathability of the head covering member 2.

[0099] The head-mounted device 10 also includes a tubular member 44 having one end 441 disposed outside E of the head covering member 2 and the other end 442 disposed inside the head covering member 2. The fan 6 blows air from one of the one end 441 and the other end 442 to the other. The first humidity sensor 52 measures the absolute humidity of intake air entering the tubular member 44 from one of the one end 441 and the other end 442. The second humidity sensor 54 measures the absolute humidity of exhaust air exiting from the other of the one end 441 and the other end 442. This makes the first humidity sensor 52 less susceptible to the influence of water vapor due to sweat from the wearer. Furthermore, the second humidity sensor 54 is less susceptible to the influence of outside air. This improves the accuracy of the absolute humidity values ​​obtained by the first humidity sensor 52 and the second humidity sensor 54.

[0100] In the head-mounted device 10, the fan 6 blows air from one end 441 to the other end 442, and is located at the upstream end of the pipe member 44. The first humidity sensor 52 is located upstream of the fan 6.

[0101] This makes the first humidity sensor 52 less susceptible to the influence of water vapor caused by sweat from the wearer, thereby improving the accuracy of the absolute humidity obtained by the first humidity sensor 52.

[0102] In the head-mounted device 10, the first humidity sensor 52 is located outside E of the head covering member 2.

[0103] This makes the first humidity sensor 52 less susceptible to the influence of water vapor caused by sweat from the wearer, thereby improving the accuracy of the absolute humidity obtained by the first humidity sensor 52.

[0104] In the head-mounted device 10, the fan 6 blows air from one end 441 to the other end 442, and is located at the upstream end of the pipe member 44. The second humidity sensor 54 is located downstream of the fan 6.

[0105] As a result, the air containing water vapor from sweat is agitated by the fan 6, which tends to make the distribution of absolute humidity uniform downstream of the fan 6. Furthermore, if there are multiple other ends 442 of the tubular member 44, the difference in absolute humidity between the tubular members 44 is suppressed. Therefore, the accuracy of the absolute humidity obtained by the second humidity sensor 54 is improved.

[0106] In the head-mounted device 10, the second humidity sensor 54 is located on the inner surface of the head covering member 2 (for example, the inner surface 202).

[0107] As a result, the head covering member 2 blocks sunlight, making it less likely that sunlight will hit the second humidity sensor 54. Since errors are less likely to occur in the temperature of the exhaust air measured by the second humidity sensor 54, the accuracy of the absolute humidity obtained by the second humidity sensor 54 improves.

[0108] In the head-mounted device 10, the first humidity sensor 52 measures the temperature and relative humidity of the intake air, and the second humidity sensor 54 measures the temperature and relative humidity of the exhaust air.

[0109] Since the absolute humidity can be calculated from the temperature and relative humidity, it is possible to calculate the absolute humidity of the intake air and exhaust air of the head-mounted device 10. This makes it possible to more appropriately estimate the amount of sweat produced by the wearer.

[0110] In addition, in the head-mounted device 10, the fan 6 blows air at a volume such that the temperature of the discharged air is equal to or higher than the dew point temperature of the discharged air.

[0111] This makes the relative humidity of the exhaust air less than 100%, suppressing condensation due to moisture contained in the exhaust air. This improves the accuracy of the absolute humidity obtained by the second humidity sensor 54. As a result, the head-mounted device 10 can improve the accuracy of measuring the amount of sweat.

[0112] The head-mounted device 10 also includes a body temperature sensor 74 that measures the body temperature of the wearer, thereby enabling the head-mounted device 10 to measure the physical condition of the wearer with higher accuracy.

[0113] Furthermore, in the head-mounted device 10, the body temperature sensor 74 measures the core body temperature, thereby enabling the head-mounted device 10 to measure the physical condition of the wearer with higher accuracy.

[0114] The head-mounted device 10 also includes a heart rate sensor 76 that measures the wearer's heart rate, thereby enabling the head-mounted device 10 to measure the wearer's physical condition with higher accuracy.

[0115] The head-mounted device 10 also includes an environmental sensor 58 that measures the wet-bulb temperature and black-bulb temperature around the wearer, allowing the head-mounted device 10 to measure the physical condition of the wearer with higher accuracy.

[0116] The head-mounted device 10 also includes an airflow measurement device for measuring the airflow rate of the fan 6. This allows for real-time measurement and correction of the airflow rate. The amount of sweating at the wearer's head can be calculated based on a more accurate airflow rate value, allowing for more accurate measurement of the amount of sweating at the wearer's head. As a result, the head-mounted device 10 can more accurately measure the physical condition of the wearer, who is a worker, which is necessary for estimating the possibility of heatstroke.

[0117] In the head-mounted device 10, the airflow measurement device is an airflow sensor 56 provided at the air inlet or air outlet of the fan 6. This makes it possible to easily measure the airflow rate of the fan 6.

[0118] Furthermore, the head-mounted device 10 may be provided with a pressure sensor for measuring the differential pressure between the air inlet and outlet of the fan 6, instead of the air volume sensor 56, and a control device 11 for calculating the air volume of the fan 6 based on information obtained from the pressure sensor. This makes it possible to easily measure the air volume of the fan 6.

[0119] Furthermore, instead of the air volume sensor 56, the head-mounted device 10 may include a detection mechanism that detects the power supply voltage that drives the fan 6, and a control device 11 that calculates the air volume of the fan 6 based on information obtained from the detection mechanism. This makes it possible to easily measure the air volume of the fan 6.

[0120] The head-mounted device 10 also includes a control device 11 that calculates the amount of sweat produced by the wearer based on information obtained from the first humidity sensor 52 and the second humidity sensor 54.

[0121] Since heavy sweating is an early symptom of heatstroke (see Non-Patent Document 2), the head-mounted device 10 can detect whether the wearer is experiencing early symptoms of heatstroke. In other words, the head-mounted device 10 can detect heatstroke at an early stage. The head-mounted device 10 can improve the accuracy of estimating the possibility of heatstroke.

[0122] The head-mounted device 10 also includes a salinity concentration sensor 72 and a control device 11. The salinity concentration sensor 72 is a device for measuring the salinity concentration of the wearer's sweat. The control device 11 calculates the amount of salt loss of the wearer based on information obtained from the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. This makes it possible to obtain the amount of salt loss in addition to the amount of sweat produced by the wearer's head. As a result, the head-mounted device 10 can measure the physical condition of the wearer, who is a worker, with higher accuracy, which is necessary for estimating the possibility of heatstroke.

[0123] The head-mounted device 10 also includes an alarm device 12 that issues an alarm when the change in the amount of sweating meets a predetermined condition. This allows the wearer to recognize early on that they may suffer from heatstroke. Therefore, the head-mounted device 10 can prevent heatstroke from becoming more severe.

[0124] The head-mounted device 10 also includes an alarm device 92 that issues an alarm when the change in salt loss meets a predetermined condition. This allows the wearer to recognize early on that they may suffer from heatstroke. Therefore, the head-mounted device 10 can prevent heatstroke from becoming more severe.

[0125] The heatstroke prevention system 1 also includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits information obtained from the first humidity sensor 52 and the second humidity sensor 54 by wireless communication. The management device 91 receives information from the communication device 13 and stores the amount of sweat of the wearer.

[0126] This allows the management device 91 to detect whether or not the wearer at a remote location is showing early symptoms of heatstroke. In other words, the heatstroke prevention system 1 can detect heatstroke at an early stage. The heatstroke prevention system 1 can improve the accuracy of estimating the possibility of heatstroke. The manager can recognize through the management device 91 that the wearer is at risk of heatstroke. Therefore, the heatstroke prevention system 1 can prevent heatstroke from becoming more severe.

[0127] The heatstroke prevention system 1 also includes an alarm device 92 that issues an alarm to a manager when the change in the amount of sweating meets a predetermined condition.

[0128] This allows the administrator to recognize early on that the wearer may be at risk of heat stroke, thereby preventing the heat stroke from becoming more serious.

[0129] In the heatstroke prevention system 1, the head-mounted device 10 is also provided with an alarm device 12 that issues an alarm to the wearer when the change in the amount of sweating meets a predetermined condition.

[0130] This allows the wearer to recognize early on that they may suffer from heat stroke, thereby preventing the heat stroke from becoming more severe.

[0131] The heatstroke prevention system 1 also includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits, by wireless communication, information obtained from the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. The management device 91 receives information from the communication device 13 and stores the amount of salt loss of the wearer.

[0132] This allows the management device 91 to detect whether or not the wearer at a remote location is showing early symptoms of heatstroke. In other words, the heatstroke prevention system 1 can detect heatstroke at an early stage. The heatstroke prevention system 1 can improve the accuracy of estimating the possibility of heatstroke. The manager can recognize through the management device 91 that the wearer is at risk of heatstroke. Therefore, the heatstroke prevention system 1 can prevent heatstroke from becoming more severe.

[0133] The heatstroke prevention system 1 also includes an alarm device 92 that issues an alarm to a manager when the change in the amount of salt loss meets a predetermined condition.

[0134] This allows the administrator to recognize early on that the wearer may be at risk of heat stroke, thereby preventing the heat stroke from becoming more serious.

[0135] In addition, in the heatstroke prevention system 1, the head-mounted device 10 includes an alarm device 12 that issues an alarm to the wearer when the change in the amount of salt loss meets a predetermined condition.

[0136] This allows the wearer to recognize early on that they may suffer from heat stroke, thereby preventing the heat stroke from becoming more severe.

[0137] The hydration warning system 1 includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits information obtained from the first humidity sensor 52 and the second humidity sensor 54 by wireless communication. The management device 91 receives information from the communication device 13, stores the amount of sweat of the wearer, and displays it.

[0138] This allows the management device 91 to detect whether the wearer in a remote location needs to hydrate. The manager can recognize through the management device 91 that the wearer needs to hydrate, and can instruct the wearer to hydrate or take a break. Therefore, the hydration warning system 1 can prevent heat stroke caused by loss of body moisture due to sweating. The hydration warning system 1 contributes to safe work management for the wearer wearing the head-worn device 10.

[0139] The hydration warning system 1 also includes an alarm device 92 that issues an alarm to a manager when the change in the amount of sweating meets a predetermined condition.

[0140] This allows the administrator to quickly recognize that the wearer needs to hydrate, thereby preventing heatstroke caused by loss of body fluids due to sweating.

[0141] In the hydration warning system 1, the head-mounted device 10 also includes an alarm device 12 that issues an alarm to the wearer when the change in the amount of sweating meets a predetermined condition.

[0142] This allows the wearer to quickly recognize that they need to replenish fluids due to a loss of body fluids caused by sweating. This allows the wearer to voluntarily drink an appropriate amount of fluids or take a rest. This prevents the wearer from suffering from heatstroke caused by a loss of body fluids due to sweating. In the hydration warning system 1, the warning device 92 may be used to instruct the administrator to drink fluids, and the warning device 12 may be used to instruct the wearer to voluntarily drink fluids.

[0143] The hydration warning system 1 includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits information obtained from the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54 via wireless communication. The management device 91 receives information from the communication device 13, stores the amount of sweat of the wearer, and displays it.

[0144] This allows the management device 91 to detect whether the wearer in a remote location needs to replenish salt. The manager can recognize through the management device 91 that the wearer needs to replenish salt, and can instruct the wearer to replenish salt or take a break. Therefore, the hydration warning system 1 can prevent heatstroke caused by a decrease in body salt due to sweating. The hydration warning system 1 contributes to the safe work management of the wearer wearing the head-worn device 10.

[0145] The hydration warning system 1 also includes an alarm device 92 that issues an alarm to a manager when the change in the amount of salt loss meets a predetermined condition.

[0146] This allows the administrator to quickly recognize that the wearer needs to replenish salt, thereby preventing heatstroke caused by a decrease in body salt due to sweating.

[0147] In addition, in the hydration warning system 1, the head-mounted device 10 includes an alarm device 12 that issues an alarm to the wearer when the transition of the amount of salt loss meets a predetermined condition.

[0148] This allows the wearer to quickly recognize that their body's salt content has decreased due to sweating and that they need to replenish salt. This allows the wearer to voluntarily take in an appropriate amount of salt or take a rest. This prevents the wearer from suffering from heatstroke due to a decrease in body salt content caused by sweating. In the hydration warning system 1, the warning device 92 may be used by an administrator to instruct the wearer to voluntarily ingest salt, and the warning device 12 may be used in combination.

[0149] (Second embodiment) Fig. 2 is a schematic diagram of a heatstroke prevention system according to a second embodiment. Fig. 3 is a schematic diagram of a sensor unit according to the second embodiment. In the heatstroke prevention system 1A according to the second embodiment, the same components as those in the heatstroke prevention system 1 described above are given the same reference numerals and their explanations will be omitted, and only different components will be explained. As shown in Fig. 2, the heatstroke prevention system 1A includes a head-mounted device 10A and a management unit 9.

[0150] The head-mounted device 10A includes a head covering member 2, a sensor unit 4A, a fan 6, a battery 16, a first humidity sensor 52, a second humidity sensor 54, an airflow sensor 56, an environment sensor 58, a salinity concentration sensor 72, a body temperature sensor 74, a heart rate sensor 76, a control device 11, an alarm device 12, a communication device 13, and an antenna 14. That is, the head-mounted device 10A differs from the head-mounted device 10 of the first embodiment in that it includes a sensor unit 4A instead of the intermediate covering member 3 and the sensor unit 4.

[0151] The sensor unit 4A includes a housing 42, a pipe member 44A, a support member 46, and a subunit 7A. The fan 6, the first humidity sensor 52, the second humidity sensor 54, the airflow sensor 56, the environment sensor 58, the salinity concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, the control device 11, the alarm device 12, the communication device 13, the antenna 14, and the battery 16 are provided in the sensor unit 4A.

[0152] One end 441 of the tubular member 44A is arranged outside E of the head covering member 2. An opening of one end 441 of the tubular member 44 is connected to the air outlet 422 of the housing 42. The other end 442A of the tubular member 44 is arranged inside the head covering member 2. In this embodiment, the tubular member 44 includes multiple other ends 442A. The openings of the other ends 442A of the tubular member 44 are connected to the lower end of the inside of the head covering member 2. The tubular member 44A includes a first tube 443 and a second tube 444. The first tube 443 includes one end 441. At least a portion of the first tube 443 is arranged outside E of the head covering member 2. The end of the first tube 443 opposite to the one end 441 communicates with the second tube 444. The first tube 443 can be said to be a tubular member that connects the housing 42 and the second tube 444.

[0153] As shown in FIG. 3, the second tube 444 is a C-shaped tube member. This allows the second tube 444 to be easily deformed according to the size of the wearer's head. The second tube 444 extends forward from the first tube 443. The second tube 444 is provided along the lower end of the inner surface 202 of the main body 20. As shown in FIG. 2, the end of the second tube 444 is located forward of the center of the main body 20 in the front-to-rear direction. The first tube 443 may communicate with any part of the second tube 444 in the longitudinal direction, but it is preferable that the first tube 443 communicate with the center of the second tube 444 in the longitudinal direction, as in this embodiment. The second tube 444 includes multiple openings on its upper surface. The multiple openings are at the other end 442A. Air sent from the fan 6 inside the housing 42 passes through the first tube 443 and the second tube 444 and is discharged upward from the other end 442A.

[0154] The subunit 7A is, for example, a plate-shaped member. The subunit 7A is attached to the surface of the second pipe 444 that faces the wearer's head. That is, the subunit 7A is attached to the inner circumferential surface of the second pipe 444. A salinity concentration sensor 72, a body temperature sensor 74, and a heartbeat sensor 76 are attached to one surface of the subunit 7A. The subunit 7A is attached to the inner circumferential surface of the second pipe 444 so that the surface on which the salinity concentration sensor 72, the body temperature sensor 74, and the heartbeat sensor 76 are attached faces the wearer's head.

[0155] (Third embodiment) Fig. 4 is a schematic diagram of a heatstroke prevention system according to a third embodiment. Fig. 4 is a schematic diagram of a sensor unit according to the third embodiment. In the heatstroke prevention system 1B according to the third embodiment, the same components as those in the heatstroke prevention system 1 described above are given the same reference numerals and their explanations are omitted, and only different components will be explained. As shown in Fig. 4, the heatstroke prevention system 1B includes a head-mounted device 10B and a management unit 9.

[0156] The head-mounted device 10B includes a head covering member 2B, a sensor unit 4B, a fan 6, a battery 16, a first humidity sensor 52, a second humidity sensor 54, an airflow sensor 56, an environment sensor 58, a control device 11, an alarm device 12, a communication device 13, and an antenna 14. That is, the head-mounted device 10A differs from the head-mounted device 10 of the first embodiment in that it includes a head covering member 2B and a sensor unit 4B instead of the head covering member 2, the intermediate covering member 3, the sensor unit 4, the salinity concentration sensor 72, the body temperature sensor 74, and the heart rate sensor 76.

[0157] The head covering member 2B is a member that covers the wearer's head. The head covering member 2B is, for example, a straw hat or a red and white sports cap. The head covering member 2B is breathable. Sweat produced on the wearer's head becomes water vapor and passes through the head covering member 2B without being blocked by the head covering member 2B. The head covering member 2B comprises a main body 20B and a brim 21B. The main body 20B is made of, for example, straw, a straw-like material, or cloth. The brim 21B is formed integrally with the main body 20B and protrudes from a lower end 201B of the main body 20B in a direction away from the wearer. In the following description, the area outside the area surrounded by the head covering member 2B is referred to as the exterior E.

[0158] The sensor unit 4B includes a housing 42B. The fan 6, the first humidity sensor 52, the second humidity sensor 54, the airflow sensor 56, the environment sensor 58, the control device 11, the alarm device 12, the communication device 13, the antenna 14, and the battery 16 are provided in the sensor unit 4B.

[0159] The housing 42B is attached to the outer surface 203 of the head covering member 2B at the top of the head. The housing 42B has an air intake 421B for drawing in air and multiple air outlets 422B for blowing out air. The housing 42B is attached so that the air outlets 422B face the outer surface 203 of the head covering member 2B. A first humidity sensor 52, an environment sensor 58, and an antenna 14 are attached to the outside of the housing 42B near the air intake 421B. A second humidity sensor 54 is attached to the outside of the housing 42B near the outer surface 203B of the head covering member 2B. A fan 6, an air flow sensor 56, a control device 11, an alarm device 12, a communication device 13, and a battery 16 are attached inside the housing 42. In the third embodiment, the air flow sensor 56 is attached to the air outlet side of the fan 6. The air flow sensor 56 may be attached to the air inlet side of the fan 6 .

[0160] The housing 42B is preferably detachable from the head covering 2B. The sensor unit 4B is preferably detachable from the head covering 2B.

[0161] In the third embodiment, the fan 6 is provided in the sensor unit 4B. The fan 6 is arranged inside the housing 42. In the third embodiment, the fan 6 guides air taken in through an air intake 421 of the housing 42 to the head covering member 2B via an air outlet 422. Air passes from the outside E through the housing 42 and the surface of the head covering member 2 to enter the inside of the head covering member 2, and is discharged to the outside E through the surface of the head covering member 2. When the wearer sweats, water vapor is supplied inside the head covering member 2. Air containing water vapor from the sweat passes through the surface of the head covering member 2 and is discharged to the outside E.

[0162] In this way, a tubular member connecting the outside E and the inside of the head covering member, as exemplified by the tubular member 44 of the first embodiment and the tubular member 44A of the second embodiment, does not necessarily have to be provided. Not providing a tubular member can contribute to miniaturization of the sensor unit 4B.

[0163] Although the embodiments of the present disclosure have been described above, the embodiments are not limited to the contents of these embodiments. For example, the second tube 444 of the second embodiment may be an O-shaped tube member that is not provided on the forehead side of the wearer but surrounds the entire head circumference. The salinity concentration sensor 72, the body temperature sensor 74, and the heart rate sensor 76 may be directly attached to the inner circumferential surface of the second tube 444. The support member 46 may be provided integrally with the second tube 444.

[0164] The sensor unit 4B of the third embodiment may be attached to the inside of the head covering member 2B. [Explanation of symbols]

[0165] 1, 1A, 1B Heatstroke prevention system, hydration warning system 10, 10A, 10B Head-mounted device 11 Control device 12 Alarm device 13. Communications equipment 14 Antenna 16 Battery 2, 2B Head covering member 20, 20B main body 201, 201B bottom end 202 Inner surface 203B Outer surface 21, 21B Tsuba 211 Inner surface 3 Intermediate covering member 31 Through hole 4, 4A, 4B sensor unit 42, 42B housing 421, 421B intake 422, 422B ventilation port 44, 44A pipe member 441 one end 442, 442A other end 443 Pipe 1 444 2nd pipe 46 Support member 52 First humidity sensor 54 Second humidity sensor 56 Air flow sensor 58 Environmental Sensors 6 Fans 7, 7A subunit 72 Salinity sensor 74 Body Temperature Sensor 76 Heart Rate Sensor 78 Cable 9 Management Department 91 Management device 92 Alarm device E External

Claims

1. a cap that covers the wearer's head and is breathable; a housing attached to an outer surface of the top of the hat and having an air intake port for drawing in air and an air outlet for sending out air; a fan disposed on the outside or inside of the hat, which blows or sucks air so that air is drawn into the housing from the air intake port, passes through the surface of the hat via the air outlet, enters the inside of the hat, and air containing water vapor due to sweat generated on the head passes through the surface of the hat and is discharged to the outside; a first humidity sensor provided on the outside of the housing adjacent to the intake port for measuring the absolute humidity of intake air entering the housing; a second humidity sensor provided outside the housing in a position close to an outer surface of the hat for measuring the absolute humidity of the exhaust air from the hat; A head-mounted device comprising:

2. the housing supports the fan, the first humidity sensor, and the second humidity sensor; a sensor unit having the housing, the fan, the first humidity sensor, and the second humidity sensor, the sensor unit being detachable from the hat; The head-mounted device of claim 1 .

3. the first humidity sensor measures the temperature and relative humidity of the intake air; The second humidity sensor measures the temperature and relative humidity of the exhaust air.

3. A head-mounted device according to claim 1 or 2.

4. The fan blows air at an air volume such that the temperature of the discharged air is equal to or higher than the dew point temperature of the discharged air. A head-mounted device according to any one of claims 1 to 3.

5. An environmental sensor is provided to measure the wet bulb temperature and black bulb temperature around the wearer. A head-mounted device according to any one of claims 1 to 4.

6. An airflow measuring device is provided to measure the airflow of the fan. A head-mounted device according to any one of claims 1 to 5.

7. The air flow measurement device includes an air flow sensor provided at the air inlet or outlet of the fan.

7. The head-mounted device of claim 6.

8. the air flow measurement device includes a pressure sensor for measuring a differential pressure of the fan; A control device is provided that calculates the air volume of the fan based on information obtained from the pressure sensor.

7. The head-mounted device of claim 6.

9. the air flow measurement device includes a detection mechanism for detecting a power supply voltage that drives the fan; A control device is provided that calculates the air volume of the fan based on the information obtained from the detection mechanism.

7. The head-mounted device of claim 6.

10. a control device that calculates the amount of sweat of the wearer based on information obtained from the first humidity sensor and the second humidity sensor; A head-mounted device according to any one of claims 1 to 9.

11. An alarm device is provided that issues an alarm when the change in the amount of sweating meets a predetermined condition.

11. A head-mounted device according to claim 10.

12. A head-mounted device according to claim 10 and a management device, the head-mounted device includes a communication device that transmits information obtained from the first humidity sensor and the second humidity sensor by wireless communication; The management device receives information from the communication device and stores the amount of sweat of the wearer calculated by the control device. Heatstroke prevention system.

13. and an alarm device that issues an alarm to the wearer or a manager when the change in the amount of sweating meets a predetermined condition. The heatstroke prevention system according to claim 12.

14. A head-mounted device according to claim 10 and a management device, the head-mounted device includes a communication device that transmits information obtained from the first humidity sensor and the second humidity sensor by wireless communication; The management device receives information from the communication device and stores the amount of sweat of the wearer calculated by the control device. Hydration warning system.

15. and an alarm device that issues an alarm to the wearer or a manager when the change in the amount of sweating meets a predetermined condition.

15. The hydration warning system of claim 14.

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