Oxygen supply system

Abstract

It promotes CO2 emissions while efficiently increasing oxygen concentration around the user's face. [Solution] The oxygen supply system comprises a housing 5 having a sleeping space 10 as an internal space, a housing 5 partitioned by a floor surface 11b, a top surface 11a facing the floor surface 11b, and a plurality of side surfaces 11c to 11f connecting the floor surface 11b and the top surface 11a, and a ventilation device 400 for ventilating the air in the sleeping space 10. The housing 5 includes an outside air inlet 411 for supplying outside air to the sleeping space 10, an oxygen supply inlet 304 for supplying oxygen to the sleeping space 10 from outside the housing 5, and a ventilation inlet 404 connected to the ventilation device 400 for exhausting the air in the sleeping space 10. The outside air inlet 411 is provided on one of the plurality of side surfaces, the oxygen supply inlet 304 is provided on the opposite side facing the one side surface, and the ventilation inlet 404 is formed to be located above the outside air inlet 411 and the oxygen supply inlet 304.

Description

Technical Field

[0001] The present disclosure is an oxygen supply system that supplies oxygen to a sleeping space where a user sleeps.

Background Art

[0002] A breathing gas supply device supplies oxygen according to the breathing cycle of a user. This breathing gas supply device is used for oxygen inhalation therapy and saves the amount of oxygen used by adjusting the concentration of oxygen according to the user's breathing (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The relaxation state and excitement state of a user are induced by the oxygen concentration. Further, by inducing the relaxation state and excitement state of the user, it may be possible to provide the user with comfortable sleep. In order to induce a relaxation state in the user, it is effective to increase the oxygen concentration of the air inhaled by the user. However, there is a problem that it is difficult to increase the oxygen concentration in a space where ventilation is performed due to CO2 emission.

[0005] Therefore, the present disclosure solves the above problems and aims to provide a technique that can efficiently increase the oxygen concentration around the face of a user while discharging CO2.

Means for Solving the Problems

[0006] To solve the above problems, an oxygen supply system in one aspect of the present disclosure is an oxygen supply system for supplying oxygen to a sleeping space in which a user sleeps, comprising a housing having a sleeping space as an internal space, partitioned by a floor surface, a top surface facing the floor surface, and a plurality of sides connecting the floor surface and the top surface, and a ventilation device for ventilating the air in the sleeping space. The housing comprises an outside air inlet for supplying outside air, which is outside the housing, to the sleeping space, an oxygen supply inlet for supplying oxygen from outside the housing to the sleeping space, and a ventilation inlet connected to the ventilation device for exhausting the air in the sleeping space. The outside air inlet is provided on one of the plurality of sides, the oxygen supply inlet is provided on the opposite surface facing the one side, and the ventilation inlet is located above the outside air inlet and the oxygen supply inlet.

[0007] Furthermore, any combination of the above components, as well as any conversion of the expressions of this disclosure between methods, apparatus, systems, recording media, computer programs, etc., are also valid forms of this disclosure. [Effects of the Invention]

[0008] According to this disclosure, it is possible to create a localized, high-concentration oxygen space around the user's face while promoting CO2 emissions. [Brief explanation of the drawing]

[0009] [Figure 1] This diagram shows the configuration of an oxygen supply system according to Example 1 or a modified example. [Figure 2] This diagram shows the configuration of the sleeping space, as shown in Figure 1. [Figure 3] Figure 2 is a side view taken from direction A. [Figure 4] This diagram shows the configuration of the control device shown in Figure 2. [Figure 5] This diagram shows the configuration of the sleeping space according to Example 2. [Figure 6] This figure shows the configuration of the control device using the oxygen supply system according to Example 2. [Figure 7] This figure shows an overview of the processing performed by the oxygen supply system according to Example 2. [Figure 8] This flowchart shows the processing procedure using the oxygen supply system according to Example 2. [Figure 9] This figure shows an overview of another process using the oxygen supply system according to Example 2. [Figure 10] This flowchart shows another processing procedure using the oxygen supply system according to Example 2. [Modes for carrying out the invention]

[0010] (Example 1) Before specifically describing the embodiments of this disclosure, an overview of the embodiments will be provided. This embodiment relates to an oxygen supply system that provides a user with comfortable sleep onset and wake-up by controlling the oxygen concentration in the space in which the user sleeps (hereinafter referred to as the "sleep space"). Generally, a higher oxygen concentration induces a relaxed state in the user, while a lower oxygen concentration induces an excited state. The oxygen supply system according to this embodiment utilizes the relationship between oxygen concentration and the user's state to increase the oxygen concentration when falling asleep and decrease the oxygen concentration when waking up.

[0011] The embodiments described below all represent preferred specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement and connection configurations of components, as well as the steps (processes) and their order shown in the following embodiments are examples and are not intended to limit the present disclosure. Accordingly, among the components in the following embodiments, those components that are not described in the independent claims representing the highest-level concepts of the present disclosure will be described as optional components. In addition, substantially identical components are denoted by the same reference numerals in each figure, and redundant explanations are omitted or simplified.

[0012] First, please refer to Figures 1, 2, and 3 to explain the overview of the oxygen supply system 1000.

[0013] Figure 1 is a diagram illustrating the configuration of the oxygen supply system 1000. The oxygen supply system 1000 is a system for supplying oxygen to the inside of the housing 5 that constitutes the sleeping space 10 where the user sleeps, and includes an oxygen sensor 105, a CO2 sensor 106, a control device 200, an oxygen supply device 300, and a ventilation device 400. Figure 2 shows the configuration of the sleeping space 10 in Figure 1 in more detail. The sleeping space 10 includes an entrance / exit 12, and the sleeping space 10 is equipped with an opening / closing door 13, an oxygen sensor 105, a CO2 sensor 106, an oxygen supply port 304, an oxygen flow path adjustment unit 305, an oxygen supply duct 302, a ventilation duct 402, a ventilation port 404, an outside air port 411, a downward outside air louver 412, and a ventilation louver 413.

[0014] Figure 3 is a side view of Figure 2 as seen from direction A. Here, direction A is the direction when the rear side surface 11c, which will be described later, is viewed from the inside of the sleeping space 10. The oxygen sensor 105, CO2 sensor 106, oxygen supply port 304, ventilation port 404, and ventilation louvers 413 are installed on the surface of the rear side surface 11c, or at positions that protrude from the rear side surface 11c toward the sleeping space 10.

[0015] The sleeping space 10 is the internal space of the housing 5 (capsule) partitioned by the top surface, floor surface, and multiple sides. In Figure 2, the top surface of the sleeping space 10 is defined as the top surface 11a, and the floor surface as the floor surface 11b. Also, if we consider the side closer to the entrance 12 as the front side and the side further from the entrance 12 as the back side, the side on the left side in Figure 2 (the back side) is defined as the rear side surface 11c, and the side on the right side in Figure 2 (the front side) is defined as the front side surface 11d. Furthermore, in Figure 3, which is a view of Figure 2 in direction A, the left side is defined as the left side surface 11e, and similarly the right side as the right side surface 11f. An openable and closable entrance 12 is provided on the front side surface 11d of the housing 5. By opening the entrance 12, the user 20 can enter the sleeping space 10 from the outside or from inside the sleeping space 10 to the outside. When going in and out. When the user 20 stays in the sleep space 10, the user closes the entrance / exit 12 using the opening / closing door 13 described later. When sleeping, the user lies horizontally with the head 22 facing a side surface different from the side surface where the entrance / exit 12 is provided. In FIG. 2, the body is lying horizontally with the head 22 close to the rear side surface 11c. In other words, the user lies with the feet near the entrance / exit 12.

[0016] The opening / closing door 13 is a plate-like member used to open and close the entrance / exit 12 of the sleep space 10. The opening / closing door 13 is arranged on the front side surface 11d and is arranged to cover the entrance / exit 12 in the closed state. The shape of the opening / closing door 13 is not limited as long as it can cover the entrance / exit 12, for example, in the shape of a roll curtain or a lid. Note that the opening / closing door 13 does not necessarily need to cover the entire surface of the entrance / exit 12 in the closed state. It may be in a state where a part of the entrance / exit 12 is open when the opening / closing door 13 is in the closed state.

[0017] The oxygen sensor 105 is a sensor for obtaining the oxygen concentration near the head 22 of the user 20 in the sleep space 10. The oxygen sensor 105 is connected to the control device 200 and outputs the obtained oxygen concentration in the space of the sleep space 10 to the control device 200. The CO2 sensor 106 is a sensor for obtaining the CO2 concentration near the head 22 of the user 20 in the sleep space 10. The CO2 sensor 106 is connected to the control device 200 and outputs the obtained CO2 concentration in the space of the sleep space 10 to the control device 200. Note that it is preferable to arrange the oxygen sensor 105 and the CO2 sensor 106 so as not to directly touch the oxygen flow 306 described later. For example, as shown in FIG. 3, it is preferable to arrange the oxygen sensor 105 and the CO2 sensor 106 at a position shifted to the left side surface 11e side or the right side surface 11f side so as to avoid directly below the oxygen supply port 304. By adopting such a configuration, it is possible to reliably measure the space concentrations of oxygen and CO2. Since known technologies may be used for the oxygen sensor 105 and the CO2 sensor 106, the description is omitted here.

[0018] The oxygen supply device 300 is connected to the control device 200 and blows out oxygen while adjusting the oxygen concentration according to instructions from the control device 200. The oxygen supply device 300 is connected to a tubular oxygen supply duct 302, which is connected to an oxygen supply port 304. The oxygen blown out from the oxygen supply device 300 passes through the oxygen supply duct 302 and is supplied to the sleep space 10 as an oxygen flow 306 from the oxygen supply port 304. The detailed flow of the oxygen flow 306 will be described later.

[0019] The oxygen supply port 304 is installed on the rear side 11c of the sleeping space 10, which is the side opposite the front side 11d where the outside air outlet 411 (described later) is located, and oxygen is supplied towards the interior of the sleeping space 10. The oxygen supply port 304 is positioned on the floor 11b side of the ventilation port 404 (described later) in order to efficiently increase the oxygen concentration around the user's head 22. In other words, the oxygen supply port 304 is positioned below the ventilation port 404. With this configuration, even when the sleeping space 10 is ventilated by the ventilation device 400 (described later), the oxygen supplied from the oxygen supply port 304 is less likely to be exhausted from the ventilation port 404. Note that the oxygen supply port 304 may also be placed on the left side 11e or right side 11f of the sleeping space 10, as long as it is on the floor 11b side and opposite the outside air outlet 411, which are higher than the ventilation port 404 and outside air outlet 411 (described later). However, in order to efficiently supply oxygen to the vicinity of the user's head 22, it is preferable to position the oxygen supply port 304 close to the rear side 11c, even when it is located on the left side 11e and right side 11f. Furthermore, it is preferable that the oxygen supply port 304 and the ventilation port 404 are located on the same surface.

[0020] Furthermore, an oxygen flow path adjustment unit 305 may be attached to the oxygen supply port 304 as a component to facilitate the guidance of the oxygen flow 306 towards the vicinity of the user's head 22 (towards the floor surface 11b of the sleeping space 10). The oxygen flow path adjustment unit 305 can be, for example, connected from the oxygen supply port 304 in Figure 2 to the sleeping space 10 One example is a tubular member that protrudes inward. Here, the tubular member is a member whose angle can be flexibly adjusted. With such a configuration, it becomes possible to adjust the angle of the oxygen flow path adjustment unit 305 according to the position of the user's head 22 and guide the oxygen flow 306 towards the vicinity of the head 22.

[0021] The ventilation device 400 is connected to the control device 200 and performs ventilation in accordance with instructions from the control device 200. The ventilation device 400 is connected to the ventilation duct 402, which is connected to the ventilation opening 404. The ventilation device 400 exhausts the air from the sleeping space 10 through the ventilation opening 404 and the ventilation duct 402. As the air from the sleeping space 10 is exhausted, fresh outside air is taken in from the outside air opening 411. For the purposes of this explanation, the outside air taken in from outside the sleeping space 10 by the ventilation device 400 will be described as the airflow 600. The outside air taken in from outside the sleeping space 10 ventilates the sleeping space 10 as the airflow 600. If ventilation is not performed in the sleeping space 10, respiratory components such as CO2 exhaled by the user 20 will remain in the space. Therefore, it is preferable to operate the ventilation device 400 at all times to ventilate respiratory components such as CO2. The detailed airflow of Airflow 600 will be described later.

[0022] The ventilation opening 404 is an exhaust vent for exhausting air from inside the sleeping space 10. In Figure 2, the ventilation opening 404 is installed on the rear side 11c. As mentioned above, the ventilation opening 404 is located above the oxygen supply port 304 (on the top surface 11a side of the sleeping space 10 than the oxygen supply port 304). The ventilation opening 404 may be placed on the left side 11e, the right side 11f, or the top surface 11a of the sleeping space 10, as long as it is on the top surface 11a side of the sleeping space 10, as long as it is above the height of the oxygen supply port 304.

[0023] The outside air vent 411 is an outside air inlet that draws in air from outside the sleeping space 10. In Figure 2, the outside air vent 411 is positioned on the lower side of the front side 11d of the sleeping space 10 and opposite the rear side 11c where the oxygen supply port 304 is installed. It is also positioned closer to the floor surface 11b than the ventilation opening 404. The outside air vent 411 may be directly provided on the front side 11d, or a part of the entrance / exit 12 may be treated as the outside air vent 411. In Figure 2, the opening / closing door 13 is intentionally made smaller than the entrance / exit 12 so that even when the opening / closing door 13 is fully closed, the area below the entrance / exit 12 remains open. Thus, the opening formed by the closed opening / closing door 13 and the entrance / exit 12 may be treated as the outside air vent 411. Alternatively, an opening may be provided in a part of the opening / closing door 13.

[0024] The downward outside air louver 412 is a plate-shaped member that facilitates the guidance of the airflow 600 towards the top surface 11a of the sleeping space 10. In other words, the downward outside air louver 412 is a member that guides the airflow 600 flowing in from the outside air inlet 411 upward above the oxygen supply inlet 304. The downward outside air louver 412 is installed on the front side surface 11d of the sleeping space 10 and is fixed, for example, rotatably at the lower end of the outside air inlet 411. The downward outside air louver 412 can be freely angled, and the flow rate and direction of the airflow 600 flowing in through the outside air inlet 411 can be adjusted according to the degree of opening and closing. For example, if the ventilation opening 404 is located above and on the opposite surface of the outside air inlet 411 as shown in Figure 2, it is preferable to adjust the angle of the downward outside air louver 412 so that the airflow 600 is guided to the ventilation opening 404. Here, since the ventilation opening 404 is located above the oxygen supply opening 304, the airflow 600 is guided above the oxygen supply opening 304 by the downward outside air louver 412. It is also possible to close the outside air opening 411 by adjusting the angle of the downward outside air louver 412 perpendicular to the floor surface 11b so that it is aligned with the entrance 12. With this configuration, when the user 20 is absent and it is desired to increase the oxygen concentration in the sleeping space 10 in advance, the outflow of oxygen due to ventilation can be suppressed. The downward outside air louver 412 may be installed directly on the front side surface 11d or on a part of the opening door 13.

[0025] The ventilation louver 413 is a plate-shaped member that adjusts the direction in which the ventilation device 400 draws in air. The ventilation louver 413 is installed on the rear side surface 11c of the sleeping space 10 and is fixed so as to be rotatable at, for example, the upper end of the ventilation opening 404. The ventilation louver 413 can be freely angled, and depending on the degree of opening and closing, it is possible to adjust the flow rate and direction of the airflow 600 that flows in through the outside air opening 411. For example, as shown in Figure 2, when the outside air opening 411 is located below and on the opposite surface of the ventilation opening 404, it is preferable to adjust the angle of the ventilation louver 413 so that the airflow 600 is guided towards the ventilation opening 404. By controlling the angle in this way, the ventilation louver 413 can guide the airflow 600 flowing in from the outside air opening 411 above the oxygen supply port 304. It is also possible to close the ventilation opening 404 by adjusting the angle of the ventilation louver 413 perpendicular to the floor surface 11b so that it is aligned with the rear side surface 11c. This configuration makes it possible to suppress the outflow of oxygen due to ventilation when the user 20 is absent and it is desired to increase the oxygen concentration in the sleeping space 10 in advance. The aforementioned downward outside air louvers 412 and ventilation louvers 413 may both be installed in the sleeping space 10, or only one of them may be installed. In particular, by providing the downward outside air louvers 412, the airflow 600 flowing in from the outside air inlet 411 is less likely to flow towards the floor surface 11b, thereby suppressing the mixing of the airflow 600 and the oxygen flow 306.

[0026] Thus, the downward outside air louvers 412 and the ventilation louvers 413 can guide the airflow 600, which is outside air supplied from the outside air inlet 411, upward above the oxygen supply inlet 304. Therefore, the downward outside air louvers 412 and the ventilation louvers 413 can be referred to as an outside air flow path adjustment section.

[0027] Next, the oxygen flow 306 and the air flow 600 will be explained in detail. Here, as shown in Figure 2, the outside air inlet 411 is located below the front side surface 11d. The oxygen supply inlet 304 is located below the rear side surface 11c, which is opposite the front side surface 11d. The ventilation inlet 404 is located above the outside air inlet 411 and the oxygen supply inlet 304 on the rear side surface 11c. Here, if the front side surface 11d is one of the multiple sides of the housing 5, then the rear side surface 11c can be described as the opposing surface.

[0028] First, let's explain the oxygen flow 306. The oxygen flow 306 flows through the oxygen supply port 304 towards the floor surface 11b of the sleeping space 10. Here, since the head 22 is close to the rear side surface 11c, the oxygen flow 306 flows in a way that increases the oxygen concentration on the floor surface 11b side and the rear side surface 11c side in the height direction of the sleeping space 10, including the area around the head 22. Specifically, the oxygen flow 306 blown out through the oxygen supply port 304 has a higher concentration of oxygen than the sleeping space 10, and the blown-out oxygen diffuses around the head 22 of the user 20 in the sleeping space 10. In this way, the diffusion of high-concentration oxygen around the head 22 of the user 20 in the sleeping space 10 results in a higher oxygen concentration around the head 22 of the user 20 in the sleeping space 10 compared to the oxygen concentration above the sleeping space 10 and the oxygen concentration outside the sleeping space 10.

[0029] Next, the airflow 600 will be described. The airflow 600 flows from below the front side 11d of the sleeping space 10 towards the rear side 11c. More specifically, the airflow 600, powered by the ventilation device 400, flows from the outside air inlet 411 along the lower outside air louver 412, along the ventilation louver 413, towards the ventilation opening 404. Here, the ventilation opening 404 is positioned above the outside air inlet 411 and the oxygen supply inlet 304. Therefore, as shown in Figure 2, the airflow 600 flows from the user's feet to above their head 22. In other words, the air in the sleeping space 10 is replaced while avoiding the area around the user's head 22 where the oxygen flow 306 is diffused. In this way, the airflow path is configured so that the airflow 600 flows from below to above the sleeping space 10 while avoiding the area around the user's head 22. This allows for the exhaust of CO2 exhaled by the user 20 to the outside while suppressing the exhaust of the supplied oxygen flow 306. In Figure 2, a blower is not installed at the outside air inlet 411, but installing one in addition is also included in "installing a ventilation device". If a blower is installed, the outside air flowing into the sleeping space 10 creates positive pressure in the sleeping space 10, causing the air in the sleeping space 10 to be expelled from the ventilation inlet 404, thus performing ventilation.

[0030] Based on the above configuration, the relationship between the airflow 600 and the oxygen flow 306 will now be explained. The airflow 600 mainly flows toward the ceiling 11a side in the height direction (diagonally crossing the ventilation opening 404 from the outside air inlet 411) as it moves toward the rear side 11c side of the sleeping space 10, while the oxygen flow 306 mainly flows toward the floor 11b side in the height direction of the sleeping space 10 (floor 11b side from the oxygen supply inlet 304). Here, CO2 exhaled by the user flows into the space at the user's feet, pushed out by the oxygen flow 306. In this way, in the space where the airflow 600 is dominant (the space diagonally crossing the ventilation opening 404 from the outside air inlet 411), CO2 exhaled by the user flows in along with some of the oxygen flow 306, so CO2 is exhausted from the ventilation opening 404 along with the airflow 600.

[0031] In contrast, in the space where the oxygen flow 306 is dominant (the floor surface 11b side in the height direction of the sleeping space 10), the oxygen concentration is higher compared to the ceiling surface 11a side in the height direction of the sleeping space 10 due to the oxygen flow 306. This is because the ventilation openings 404 and outside air openings 411 are positioned so that the ventilation airflow 600 does not interfere with the area below the sleeping space 10 (especially around the head 22 of the user 20), and the airflow 600 is further guided by the downward outside air louvers 412 or ventilation louvers 413. In this way, the airflow path that minimizes interference between the airflow 600 and the oxygen flow 306 allows for the exhaust of CO2 exhaled by the user 20 to be suppressed while the exhaust of the supplied oxygen flow 306 is exhausted to the outside.

[0032] Next, the control of the oxygen supply system 1000 will be described with reference to Figure 4. Figure 4 shows the configuration of the control device 200. The control device 200 includes an oxygen concentration acquisition unit 201, a CO2 concentration acquisition unit 202, an oxygen concentration control unit 210, and a CO2 concentration control unit 212.

[0033] The oxygen concentration acquisition unit 201 acquires the oxygen concentration of the sleep space 10 detected by the oxygen sensor 105. The oxygen concentration acquisition unit 201 is connected to the oxygen concentration control unit 210.

[0034] The CO2 concentration acquisition unit 202 acquires the CO2 concentration of the sleep space 10 obtained by the CO2 sensor 106. The CO2 concentration acquisition unit 202 is connected to the CO2 concentration control unit.

[0035] The oxygen concentration control unit 210 is connected to the oxygen supply device 300 and the ventilation device 400 and controls the oxygen concentration in the sleep space 10. For example, if the value obtained by the oxygen sensor 105 is lower than the target oxygen concentration in the sleep space 10, the oxygen concentration control unit 210 increases the amount of oxygen blown out from the oxygen supply device 300. By making the target oxygen concentration higher than that outside the sleep space 10, the oxygen concentration in the sleep space 10 is made higher than the oxygen concentration before the user 20 entered the sleep space 10 (the oxygen concentration outside the sleep space 10). If the value obtained by the oxygen sensor 105 is higher than the target oxygen concentration in the sleep space 10, the amount of oxygen blown out from the oxygen supply device 300 may be reduced. Also, if it is necessary to quickly reduce the oxygen concentration in the sleep space 10, the output of the ventilation device 400 may be increased to lower the oxygen concentration in the sleep space 10.

[0036] The CO2 concentration control unit 212 is connected to the ventilation device 400 and controls the CO2 concentration in the sleeping space 10. Specifically, the CO2 concentration control unit 212 adjusts the CO2 concentration by controlling the airflow of the ventilation device 400 based on the value detected by the CO2 sensor 106. For example, the CO2 concentration control unit 212 sets the value obtained from the CO2 sensor 106 to a target value in the sleeping space 10. If the CO2 concentration is lower than the target CO2 concentration, the airflow of the ventilation device 400 is reduced or maintained. If the value obtained from the CO2 sensor 106 is higher than the target CO2 concentration in the sleeping space 10, the airflow of the ventilation device 400 is increased.

[0037] Here, the specific control operation of the oxygen concentration control unit 210 will be described. In addition to control based on the value obtained from the oxygen sensor 105 mentioned above, the oxygen concentration control unit 210 can increase the amount of oxygen blown out from the oxygen supply device 300 at fixed timings or by the user 20's actions. Here, when the value measured by the oxygen sensor 105 reaches the target oxygen concentration, the amount of oxygen blown out from the oxygen supply device 300 is reduced. Note that stopping the oxygen supply device 300 and setting the amount of oxygen blown out to zero is also included in reducing the amount of oxygen blown out. Furthermore, in addition to the above example, the control of the amount of oxygen blown out using the oxygen supply device 300 may also be done using a human presence sensor that can detect the presence of the user 20, or an imaging device that can confirm whether the user has fallen asleep. For example, if the human presence sensor detects the presence of the user 20, the oxygen supply may be increased, and if the user is not present, the oxygen supply may be decreased. Alternatively, if the imaging device confirms that the user has fallen asleep, the oxygen supply may be maintained or decreased, and if the user is not asleep, the oxygen supply may be increased.

[0038] As described above, the oxygen supply system 1000 according to this embodiment 1 can provide the following benefits.

[0039] (1) The oxygen supply system 1000 is a housing 5 having a sleeping space 10 as an internal space, partitioned by a floor surface 11b, a top surface 11a facing the floor surface 11b, and a plurality of sides connecting the floor surface 11b and the top surface 11a, and includes a ventilation device 400 for ventilating the air in the sleeping space 10, the housing 5 includes an outside air inlet 411 for supplying outside air, which is outside air of the housing 5, to the sleeping space 10, an oxygen supply inlet 304 for supplying oxygen from outside the housing 5 to the sleeping space 10, and a ventilation inlet 404 connected to the ventilation device 400 for exhausting the air in the sleeping space 10, the outside air inlet 411 is provided on one of the plurality of sides (corresponding to the front side surface 11d in Figure 2), the oxygen supply inlet 304 is provided on the opposite side facing the one side (corresponding to the rear side surface 11c in Figure 2), and the ventilation inlet 404 is formed to be located above the outside air inlet 411 and the oxygen supply inlet 304.

[0040] With this configuration, compared to the case where the ventilation opening 404 is located below the oxygen supply opening 304, it is possible to suppress the exhaust of oxygen from the ventilation opening 404 carried by the airflow 600. More specifically, if the ventilation opening 404 is located below the oxygen supply opening 304, the oxygen supplied from the oxygen supply opening 304 will be exhausted from the ventilation opening 404 carried by the airflow 600 before it reaches the vicinity of the user's head 22 as the oxygen flow 306. In other words, the oxygen concentration is less likely to rise. With this configuration, the ventilation opening 404 is positioned above the oxygen supply opening 304. In other words, the outside air flowing in from the outside air opening 411 flows upward above the oxygen supply opening 304 as the airflow 600. Here, since the oxygen flow 306 flows downward below the oxygen supply opening 304, the airflow 600 is less likely to interfere with the oxygen flow 306, and the vicinity of the user's head 22 can be maintained at a high oxygen concentration. Furthermore, the airflow 600 diagonally traverses the sleeping space 10 from below the front side 11d towards the rear side 11c, moving from the outside air inlet 411 towards the ventilation opening 404, thereby allowing CO2 emitted from the user 20 to be carried and exhausted by the airflow. This makes it possible to efficiently exhaust CO2 while maintaining a high oxygen concentration on the floor surface 11b where the user 20 is located. Thus, it is possible to create a localized high-concentration oxygen space around the user 20's face while promoting CO2 exhaust.

[0041] (2) In the oxygen supply system 1000, the housing 5 may be configured to include an outside air flow path adjustment section for guiding the outside air supplied from the outside air port 411 to a position above the oxygen supply port 304.

[0042] Here, the outside airflow adjustment section refers to either the lower outside air louver 412 or the ventilation louver 413, or both.

[0043] With this configuration, compared to the case where the downward outside air louvers 412 and ventilation louvers 413 are not provided, the airflow 600 is guided in a straight line from the outside air inlet 411 to the ventilation inlet 404. In other words, the airflow 600 is less likely to flow toward the floor surface 11b, thus suppressing the exhaust of oxygen along with the airflow 600. This makes it possible to maintain a high oxygen concentration on the floor surface 11b side where the user 20 is located. Therefore, a localized high-concentration oxygen space can be created around the user 20's face. In addition, by creating an airflow path that flows from the user 20's feet upward above the oxygen supply inlet 304, interference with the oxygen flow 306 can be suppressed while exhausting CO2 emitted from the user 20 along with the airflow 600. (Example 2) Next, Example 2 will be described with reference to Figures 5-10. Example 2 relates to an oxygen supply system 1000 similar to Example 1. In the oxygen supply system 1000 according to Example 1, the outside air inlet 411 is located on the lower side of the front side surface 11d of the sleeping space 10, and the lower outside air louver 412 is installed along the outside air inlet 411. On the other hand, in the oxygen supply system 1000 according to Example 2, the auxiliary outside air inlet 414 is located on the upper side of the front side surface 11j of the housing 5a. In addition, the upper outside air louver 415 is rotatably fixed to the upper end of the auxiliary outside air inlet 414. In the following, the configurations common to the oxygen supply system 1000 according to Example 1 will be omitted from the explanation, and the differences from Example 1 will be the main focus of the explanation.

[0044] Figure 5 is a detailed diagram showing the configuration of the sleeping space 10a, which is the internal space of the housing 5a in Embodiment 2. Similar to Embodiment 1, the sleeping space 10a includes an entrance / exit 12, and is equipped with an opening / closing door 13a, an oxygen sensor 105, a CO2 sensor 106, an oxygen supply port 304, an oxygen flow path adjustment unit 305, an oxygen supply duct 302, a ventilation port 404, a ventilation louver 413, an outside air port 411, and a downward outside air louver 412. Additionally, an auxiliary outside air port 414 and an upward outside air louver 415 are newly installed. In Figure 5, the top surface of the sleeping space 10a is referred to as the top surface 11g, the floor surface as the floor surface 11h, the left depth side in Figure 5 as the rear side surface 11i, and the right side in Figure 5 as the front side surface 11j. Furthermore, when the rear side surface 11i in Figure 5 is viewed from the front from inside the sleeping space 10a, the left side surface is designated as the left side surface 11k, and similarly, the right side surface is designated as the right side surface 11l. In addition, the outer casing of the sleeping space 10a, which is composed of the top surface 11g, the floor surface 11h, the rear side surface 11i, the front side surface 11j, the left side surface 11k, and the right side surface 11l, is designated as the housing 5a.

[0045] The opening / closing door 13a is a plate-shaped member used to open and close the entrance / exit 12 of the sleeping space 10a, similar to Embodiment 1. The opening / closing door 13a is located on the front side 11j.

[0046] The oxygen supply port 304 is installed on the rear side 11i, which is opposite to the front side 11d of the sleeping space 10a where the outside air port 411 (described later) is located, as in Example 1. It is positioned on the floor surface 11h side of the ventilation port 404 (described later) in order to efficiently increase the oxygen concentration around the user's head 22. It is also positioned on the floor surface 11h side of the auxiliary outside air port 414 (described later). Here, the oxygen blown out from the oxygen supply device 300 passes through the oxygen supply duct 302 and is blown into the sleeping space 10a as an oxygen flow 306 via the oxygen supply port 304. The detailed flow of the oxygen flow 306 will be described later.

[0047] The ventilation device 400 takes in fresh air from the outside air inlet 411 and auxiliary outside air inlet 414 via the ventilation opening 404 and ventilation duct 402, and ventilates the sleeping space 10a as airflow 600a and airflow 600b. The detailed airflow of airflow 600a and airflow 600b will be described later.

[0048] The ventilation opening 404 is an exhaust vent for exhausting air from inside the sleeping space 10a. Similar to Embodiment 1, the ventilation opening 404 is installed on the rear side surface 11i of the sleeping space 10a. The ventilation opening 404 is positioned above the oxygen supply port 304 (on the top surface 11g side of the sleeping space 10a than the oxygen supply port 304).

[0049] The outside air vent 411 is an outside air inlet that draws in air from outside the sleeping space 10a. Similar to Embodiment 1, the outside air vent 411 is installed on the front side 11j of the sleeping space 10a. The outside air vent 411 is located below the floor surface 11h of the sleeping space 10, relative to the oxygen supply port 304. The outside air vent 411 is also provided on the surface facing the oxygen supply port 304.

[0050] The downward outside air louver 412 is a component that facilitates the guidance of the airflow 600a, described later, towards the top surface 11g of the sleeping space 10. Similar to Embodiment 1, the downward outside air louver 412 is installed on the front side surface 11j of the sleeping space 10a and is rotatably fixed to the lower end of the outside air opening 411. The downward outside air louver 412 can be freely angled by the opening / closing control unit 213, described later, and the flow rate of the airflow 600a flowing in through the outside air opening 411 can be adjusted according to the degree of opening and closing. It is also possible to close the outside air opening 411 by adjusting the angle of the downward outside air louver 412 perpendicular to the floor surface 11h so that it is aligned with the entrance / exit 12.

[0051] The auxiliary outside air vent 414 is an outside air intake that takes in air from outside the sleeping space 10a at a different location from the outside air vent 411. In Figure 5, the auxiliary outside air vent 414 is positioned above the front side surface 11j of the sleeping space 10a and opposite the rear side surface 11i where the oxygen supply port 304 is installed. The auxiliary outside air vent 414 is also positioned above the outside air vent 411 (towards the top surface 11g of the sleeping space 10a). The auxiliary outside air vent 414 may be directly provided on the front side surface 11j, or a part of the entrance / exit 12 may be treated as the auxiliary outside air vent 414. In Figure 5, the opening door 13a is deliberately made smaller than the entrance / exit 12 so that the area above the entrance / exit 12 remains open even when the opening door 13 is fully closed. Thus, the opening formed by the closed opening door 13a and the entrance / exit 12 may be treated as the auxiliary outside air vent 414. Additionally, an opening may be provided in part of the opening / closing door 13a.

[0052] The upper outside air louver 415 is a component that makes it difficult for the airflow 600b, described later, to flow towards the floor surface 11h of the sleeping space 10a. In other words, the upper outside air louver 415 is a component that guides the airflow 600b flowing in from the auxiliary outside air vent 414 toward the ventilation opening 404. The upper outside air louver 415 is installed on the front side surface 11d of the sleeping space 10a and is rotatably fixed to the lower end of the auxiliary outside air vent 414. The angle of the upper outside air louver 415 can be freely changed by the opening / closing control unit 213, described later, and the flow rate of the airflow 600 flowing in through the auxiliary outside air vent 414 can be adjusted according to the degree of opening and closing. It is also possible to close the auxiliary outside air vent 414 by adjusting the angle of the upper outside air louver 415 perpendicular to the floor surface 11h so that it is aligned with the entrance / exit 12. The upper outside air louvers 415 may be directly installed on the front side surface 11d, or they may be installed on a part of the opening / closing door 13a.

[0053] Next, the airflows 600a and 600b and the oxygen flow 306 will be described. First, airflow 600a flows from below the front side 11j of the sleeping space 10a toward the upper side 11i of the rear side 11i. More specifically, airflow 600a flows from the outside air inlet 411 toward the ventilation opening 404, powered by the ventilation device 400. Airflow 600a flows from the feet of the user 20 toward the upper side of the head 22 (towards the top surface 11g of the sleeping space 10a), taking in CO2 and other substances exhaled by the user 20 and exhausting them to the outside.

[0054] The airflow 600b is from above the front side 11j of the sleeping space 10a to above the rear side 11i. It flows in that direction. More specifically, airflow 600b flows from the auxiliary outside air outlet 414 toward the ventilation opening 404, powered by the ventilation device 400. Compared to airflow 600a, airflow 600b flows from above the user's feet toward the top of their head 22 (towards the top surface 11g of the sleeping space 10a), taking in CO2 and other substances exhaled by the user 20 and exhausting them to the outside. If airflows 600a and 600b are flowing simultaneously, they mix together as they approach the ventilation opening 404 and are exhausted.

[0055] Let's explain the oxygen flow 306. The oxygen flow 306 flows through the oxygen supply port 304 towards the floor surface 11h of the sleeping space 10. At this time, it flows in a way that increases the oxygen concentration on the floor surface 11h side in the height direction of the sleeping space 10a, including the area around the head 22, and on the rear side surface 11i side. Specifically, the oxygen flow 306, which is high-concentration oxygen, diffuses around the head 22 of the user 20, thereby increasing the oxygen concentration near the head 22. In this way, the diffusion of high-concentration oxygen around the head 22 of the user 20 in the sleeping space 10a results in a higher oxygen concentration around the head 22 of the user 20 in the sleeping space 10a compared to the oxygen concentration above the sleeping space 10a and the oxygen concentration outside the sleeping space 10a.

[0056] Based on the above configuration, the relationship between airflow 600a, airflow 600b, and oxygen flow 306 will now be explained. Airflow 600a flows mainly upward (in a direction that diagonally crosses the ventilation opening 404 from the outside air inlet 411) as it moves toward the rear side 11i of the sleeping space 10a, while airflow 600b flows mainly along the top surface 11g of the sleeping space 10a from the front side 11j toward the rear side 11i (in a direction that crosses the ventilation opening 404 from the auxiliary outside air inlet 414). In addition, oxygen flow 306 flows mainly toward the floor surface 11h side in the height direction of the sleeping space 10a (floor surface 11h side of the oxygen supply inlet 304).

[0057] Depending on the control method of the control device 200 described later, there are three possible combinations of airflow 600a and airflow 600b and oxygen flow 306.

[0058] First, let's explain the case where airflow 600a and oxygen flow 306 are flowing. CO2 exhaled by the user flows into the area around the user's feet, pushed out by oxygen flow 306. In this way, in the space where airflow 600a is dominant (the space diagonally crossing from the outside air inlet 411 to the ventilation opening 404), CO2 exhaled by the user flows in along with some of the oxygen flow 306 and is exhausted from the ventilation opening 404 along with airflow 600a.

[0059] In contrast, in the space where the oxygen flow 306 is dominant (the floor surface 11h side in the height direction of the sleeping space 10a), the oxygen concentration is higher due to the oxygen flow 306 compared to the top surface 11g side in the height direction of the sleeping space 10a. This is because by placing the outside air inlet 411 at the feet of the user 20 and the ventilation opening 404 above the oxygen supply inlet 304, the ventilation airflow 600a is less likely to interfere with the lower part of the sleeping space 10a (especially around the head 22 of the user 20).

[0060] Next, we will explain the case where airflow 600b and oxygen flow 306 are flowing. In the space where airflow 600b is dominant (the space extending from the auxiliary outside air inlet 414 across the ventilation opening 404), CO2 exhaled by the user flows in along with a portion of the oxygen flow 306 and is exhausted from the ventilation opening 404.

[0061] In contrast, in the space where oxygen flow 306 is dominant (the floor surface 11h side in the height direction of the sleeping space 10a), the oxygen concentration is higher compared to the top surface 11g side in the height direction of the sleeping space 10a due to oxygen flow 306. This is because the ventilation openings 404 and auxiliary outside air openings 414 are positioned so that the ventilation airflow 600b does not interfere with the area below the sleeping space 10a (especially the floor surface 11h side of the sleeping space 10a). Note that airflow 600a flows from below to above the sleeping space 10a, while airflow 600b flows along the top surface 11g of the sleeping space 10a. Because of this flow, less oxygen flow 306 is drawn in than airflow 600a.

[0062] Finally, we will explain the case where airflow 600a, airflow 600b, and oxygen flow 306 are flowing. When airflow 600a and airflow 600b are flowing simultaneously, CO2 exhaled by the user flows into the main space (the space formed by combining the space diagonally crossing the ventilation opening 404 from the outside air inlet 411 and the space crossing the ventilation opening 404 from the auxiliary outside air inlet 414) along with a portion of the oxygen flow 306, and is exhausted from the ventilation opening 404.

[0063] In contrast, in the space where oxygen flow 306 is dominant (the floor surface 11h side in the height direction of the sleeping space 10a), the oxygen concentration is higher compared to the ceiling surface 11g side in the height direction of the sleeping space 10a due to oxygen flow 306. This is because the ventilation opening 404, the outside air opening 411, and the auxiliary outside air opening 414 are positioned so that the ventilation airflows 600a and 600b do not interfere with the area below the sleeping space 10a (especially around the head 22 of the user 20).

[0064] Next, the control of the oxygen supply system 1000 according to Example 2 will be described with reference to Figure 6. Figure 6 shows the configuration of the control device 200. Similar to Example 1, the control device 200 includes an oxygen concentration acquisition unit 201, a CO2 concentration acquisition unit 202, an oxygen concentration control unit 210, and a CO2 concentration control unit 212, and in Example 2, an on / off control unit 213 is provided.

[0065] The opening / closing control unit 213 controls the opening / closing state of either the upper outside air louver 415 or the lower outside air louver 412 according to the oxygen concentration and CO2 concentration in the sleeping space 10a. Specifically, the opening / closing control unit 213 is connected to the oxygen concentration control unit 210 (described later), the CO2 concentration control unit 212, the upper outside air louver 415, and the lower outside air louver 412, and controls the opening / closing state of either the upper outside air louver 415 or the lower outside air louver 412 according to the control signals for oxygen concentration and CO2 concentration. The operation of the opening / closing states of the upper outside air louver 415 and the lower outside air louver 412 will be described later.

[0066] The oxygen concentration control unit 210 is connected to the oxygen supply device 300, the ventilation device 400, and the on / off control unit 213, and controls the oxygen concentration in the sleep space 10a. Similar to Example 1, the oxygen supply amount and ventilation amount are adjusted according to the oxygen concentration in the sleep space 10a obtained by the oxygen sensor 105. The specific operation will be described later with reference to Figures 7 and 8.

[0067] The CO2 concentration control unit 212 is connected to the ventilation device 400 and the on / off control unit 213, and controls the CO2 concentration in the sleeping space 10a. Similar to Example 1, the ventilation rate is adjusted according to the CO2 concentration in the sleeping space 10 obtained by the CO2 sensor 106. The specific operation will be described later with reference to Figures 7 and 8.

[0068] Figure 7 shows an overview of the processing performed by the oxygen supply system 1000. The horizontal axis represents time, and the right vertical axis represents oxygen concentration or CO2 concentration. The dotted line in Figure 7 indicates a predetermined threshold for oxygen concentration or CO2 concentration. For example, the predetermined threshold is 30% for oxygen concentration and 1000 ppm for CO2 concentration. If the concentration is higher than the predetermined threshold, operation is performed in the first mode described later, and if the concentration is lower, operation is performed in the second mode.

[0069] Here, the first mode is a state in which the outside air vent 411 is open and the auxiliary outside air vent 414 is controlled to be closed by the upper outside air louver 415. When the auxiliary outside air vent 414 is closed, the airflow 600b is blocked and only the airflow 600a flows into the sleeping space 10a from the outside air vent 411. In this operating mode, compared to the case in which the auxiliary outside air vent 414 is open and the outside air vent 411 is closed, ventilation can be performed from the floor surface 11h side of the sleeping space 10a. Since the airflow 600a flows from the bottom to the top of the sleeping space 10a, the amount of oxygen flow 306 and CO2 drawn in is greater than that of airflow 600b. This is a common issue. Therefore, when ventilation is performed in first mode, it is possible to suppress excessive increases in oxygen and CO2 concentrations and adjust them to appropriate levels.

[0070] Furthermore, the second mode is a state in which the auxiliary outside air vent 414 is open and the outside air vent 411 is controlled to be closed by the lower outside air louver 412. When the outside air vent 411 is closed, the airflow 600a is blocked and the airflow 600b flows into the sleeping space 10a from the auxiliary outside air vent 414. In this operating mode, compared to the case where the outside air vent 411 is open and the auxiliary outside air vent 414 is closed, ventilation becomes possible from the top surface 11g side of the sleeping space 10a. Since the airflow 600b flows above the sleeping space 10a along the top surface 11g, less oxygen flow 306 is drawn in than with the airflow 600a. In other words, since the airflow 600b interferes less with the oxygen flow 306 than with the airflow 600a, it is useful when you want to increase the oxygen concentration in the sleeping space 10a while ventilating.

[0071] Here, we will explain the specific control operations with reference to Figure 8. Figure 8 is a flowchart showing the processing procedure by the oxygen supply system 1000. The flowchart in Figure 8 shows the same control flow for both oxygen and CO2. In other words, "current concentration" shown in S150 of Figure 8 can be read as "current oxygen concentration" or "current CO2 concentration".

[0072] First, let's explain the oxygen concentration control flow. Control begins after the oxygen supply device 300 and the ventilation device 400 have started operating. The oxygen concentration in the sleep space 10a is detected at predetermined intervals, and it is determined whether the obtained oxygen concentration is above a predetermined threshold (S150). If it is above the predetermined threshold (Y in S150), the first mode is implemented by opening the outside air outlet 411 and closing the auxiliary outside air outlet 414 (S151). In this mode, the system can be operated in a way that suppresses the rate of increase in oxygen concentration. If it is below the predetermined threshold (N in S150), the second mode is implemented by closing the outside air outlet 411 and opening the auxiliary outside air outlet 414 (S153). In this mode, the system can be operated in a way that improves the rate of increase in oxygen concentration in the sleep space 10a. After that, the control flowchart ends once, and control is restarted after a predetermined time. To explain using specific values, for example, if the predetermined threshold oxygen concentration is 30%, then if the current concentration in S150 is 31%, the first mode is performed (S151). After about one minute has passed, if the current concentration in S150 is 29%, the second mode is performed (S153).

[0073] Next, the control flow for CO2 concentration will be explained. Control begins after the oxygen supply device 300 and the ventilation device 400 have started operating. The CO2 concentration in the sleeping space 10a is detected at predetermined intervals, and it is determined whether the obtained CO2 concentration is above a predetermined threshold (S150). If it is above the predetermined threshold (Y in S150), the first mode is implemented by opening the outside air outlet 411 and closing the auxiliary outside air outlet 414 (S151). In this mode, the sleeping space 10a is easily ventilated, and the system is operated in a way that accelerates the rate of decrease in CO2 concentration. If it is below the predetermined threshold (N in S150), the second mode is implemented by closing the outside air outlet 411 and opening the auxiliary outside air outlet 414 (S153). In this mode, the system is operated in a way that suppresses the increase in CO2 concentration in the sleeping space 10a while facilitating an increase in oxygen concentration. After that, the control flowchart ends once, and control is restarted after a predetermined time. To explain using specific values, for example, if the predetermined threshold is a CO2 concentration of 1000 ppm, then if the current concentration in S150 is 2000 ppm, the first mode is executed (S151). After about 1 minute has passed, if the current concentration in S150 is 800 ppm, the second mode is executed (S153).

[0074] Furthermore, regarding the increase and decrease in oxygen and CO2 concentrations, in addition to the opening and closing control of the first and second modes, operation is carried out by combining the output adjustment of the oxygen supply device 300 and the ventilation device 400. Alternatively, if the oxygen concentration in the sleep space 10a is lower than a predetermined threshold, the output of the oxygen supply device 300 may be increased while the second mode is being implemented. In other words, by increasing the output of the oxygen supply device 300, it is possible to approach the predetermined threshold more quickly. Also, if the CO2 concentration in the sleep space 10a is higher than a predetermined threshold, the output of the ventilation device 400 may be increased while the first mode is being implemented. In other words, by increasing the ventilation volume of the ventilation device 400, it is possible to approach the predetermined threshold more quickly. In this case, since increasing the ventilation volume will also decrease the oxygen concentration in the sleep space 10a, it is preferable to adjust the ventilation volume according to the oxygen concentration.

[0075] As described above, the oxygen supply system 1000 according to Example 2 can provide the following benefits. (1) In the oxygen supply system 1000, the housing 5a is formed to have an auxiliary outside air port 414 located above the outside air port 411 and the oxygen supply port 304 on one side (the front side 11j in Figure 5).

[0076] With this configuration, ventilation is promoted by the airflow 600b, compared to the case where only the outside air vent 411 is provided on the front side 11j of the sleeping space 10a. In other words, since ventilation is possible with both airflow 600a and airflow 600b, it is possible to efficiently exhaust CO2 even when the CO2 concentration in the sleeping space 10a becomes high. Therefore, it is possible to promote the exhaust of CO2 around the user's face 20. (2) The oxygen supply system 1000 includes an opening / closing control unit 213 that selectively opens and closes either the outside air port 411 or the auxiliary outside air port 414, and the opening / closing control unit 213 is switchable between a first mode in which the outside air port 411 is open and the auxiliary outside air port 414 is closed and a second mode in which the auxiliary outside air port 414 is open and the outside air port 411 is closed, and is configured to switch between the first mode and the second mode at predetermined intervals.

[0077] With this configuration, the opening / closing control unit 213 switches between the first mode and the second mode alternately every few minutes, so that the oxygen concentration alternates between a state where it is likely to increase and a state where it is likely to decrease. This control makes it possible to stabilize the oxygen concentration in the sleeping space 10a. For example, when operation starts with the oxygen concentration of the sleeping space 10a at the oxygen concentration outside the sleeping space 10a (oxygen concentration in the air of 21%), in the second mode, the outside air vent 411 is closed by the lower outside air louver 412 and the auxiliary outside air vent 414 is opened, causing the airflow 600b to flow into the top surface 11g side of the sleeping space 10a. At this time, since the airflow 600b interferes less with the oxygen flow 306 than the airflow 600a, the oxygen concentration becomes higher around the head 22 of the user 20. On the other hand, after a few minutes, in the first mode, the auxiliary outside air vent 414 is closed by the upper outside air louver 415, and the outside air vent 411 opens, allowing outside air to flow in from the floor surface 11h side of the sleeping space 10a. At this time, the sleeping space 10a is ventilated diagonally by the airflow 600a from below the front side 11j to above the rear side 11i, so the amount of ventilation around the user's head 22 increases compared to when ventilated by airflow 600b, and the oxygen concentration decreases. By repeating this operation every few minutes, it is possible to stabilize the oxygen concentration in the sleeping space 10a. Therefore, it is possible to prevent the oxygen level around the user's face from becoming too high. (3) The oxygen supply system 1000 includes an open / close control unit 213 that selectively opens and closes either the outside air port 411 or the auxiliary outside air port 414, and an oxygen sensor 105 that detects the oxygen concentration in the sleeping space 10a. The open / close control unit 213 is switchable between a first mode in which the outside air port 411 is open and the auxiliary outside air port 414 is closed, and a second mode in which the auxiliary outside air port 414 is open and the outside air port 411 is closed. The system is configured to control in the first mode when the oxygen concentration detected by the oxygen sensor 105 is above a predetermined threshold, and to control in the second mode when the oxygen concentration detected by the oxygen sensor 105 is below a predetermined threshold.

[0078] With this configuration, compared to when the opening / closing control unit 213 is controlled by time, the sleep space The oxygen concentration in space 10a is detected by the oxygen sensor 105 and can be controlled according to a predetermined threshold. In other words, the value at which the oxygen concentration is stabilized can be adjusted by setting the threshold. For example, if the predetermined threshold for the oxygen concentration in the sleeping space 10a is 30%, and the current oxygen concentration is 21%, then in the second mode, when the outside air vent 411 is closed by the lower outside air louver 412 and the auxiliary outside air vent 414 is opened, airflow 600b flows into the top surface 11g side of the sleeping space 10a. At this time, since airflow 600b interferes less with the oxygen flow 306 than airflow 600a, the oxygen concentration becomes higher around the user's head 22. On the other hand, if the current oxygen concentration is 31%, then in the first mode, when the auxiliary outside air vent 414 is closed by the upper outside air louver 415 and the outside air vent 411 is opened, outside air flows into the sleeping space 10a from the floor surface 11h side. At this time, the airflow 600a ventilates the sleeping space 10a diagonally from the lower front side 11j to the upper rear side 11i, increasing the amount of ventilation around the user's head 22 and lowering the oxygen concentration. By repeating this process, it is possible to stabilize the oxygen concentration in the sleeping space 10a at a predetermined threshold. Therefore, it is possible to prevent the oxygen level around the user's face from becoming too high. (4) The oxygen supply system 1000 includes an open / close control unit 213 that selectively opens and closes either the outside air port 411 or the auxiliary outside air port 414, and a CO2 sensor 106 that detects the CO2 concentration in the sleep space 10a. The open / close control unit 213 is switchable between a first mode in which the outside air port 411 is open and the auxiliary outside air port 414 is closed, and a second mode in which the auxiliary outside air port 414 is open and the outside air port 411 is closed. The system is configured to control in the first mode when the CO2 concentration detected by the CO2 sensor 106 is above a predetermined threshold, and to control in the second mode when the CO2 concentration detected by the CO2 sensor 106 is below a predetermined threshold.

[0079] With this configuration, compared to controlling the opening / closing control unit 213 by time, the CO2 concentration in the sleeping space 10a can be detected by the CO2 sensor 106 and controlled according to a predetermined threshold. In other words, by setting the threshold, it is possible to adjust at what value the carbon dioxide concentration is stabilized. Furthermore, it is possible to increase the oxygen concentration while suppressing an excessive increase in CO2 concentration. For example, if the predetermined threshold for the CO2 concentration in the sleeping space 10a is 1000 ppm, and the current CO2 concentration is 800 ppm, in the second mode, when the outside air vent 411 is closed by the lower outside air louver 412 and the auxiliary outside air vent 414 is opened, an airflow 600b flows into the top surface 11g side of the sleeping space 10a. At this time, since the airflow 600b interferes less with the oxygen flow 306 than the airflow 600a, the oxygen concentration becomes higher around the user's head 22. On the other hand, if the current CO2 concentration is 2000 ppm, in the first mode, the auxiliary outside air vent 414 is closed by the upper outside air louver 415 and the outside air vent 411 is opened, allowing outside air to flow in from the floor surface 11h side of the sleeping space 10a. At this time, the airflow 600a ventilates the sleeping space 10a diagonally from the lower front side 11j to the upper rear side 11i, increasing the amount of ventilation around the user's head 22 and lowering the CO2 concentration. In other words, it is possible to switch between a first mode, which exhausts CO2 while suppressing the reduction in oxygen concentration, and a second mode, which further reduces the reduction in oxygen and CO2 concentrations compared to the first mode. By repeating this operation, it is possible to stabilize the CO2 concentration in the sleeping space 10a at a predetermined threshold while increasing the oxygen concentration. Therefore, it is possible to create a localized high-concentration oxygen space around the user's face while suppressing an excessive increase in CO2. (modified version) Next, a modified example will be described with reference to Figures 9 and 10. The modified example relates to an oxygen supply system 1000 similar to that of Example 2. The oxygen supply system 1000 of the modified example has the same structure and control unit as shown in Figures 5 and 6, so its description will be omitted. On the other hand, the oxygen supply system 1000 of the modified example differs in the operation of the upper outside air louvers 415 and the lower outside air louvers 412, so the differences from Example 2 will be explained in detail.

[0080] Figure 9 shows an overview of another process using the oxygen supply system 1000. The horizontal axis represents time, and the vertical axis on the right represents oxygen concentration. Of the dotted lines in Figure 9, the upper dotted line represents the first threshold, and the lower dotted line represents the first threshold. The dotted line indicates the second threshold. The first threshold is, for example, 32% oxygen concentration, and the second threshold is, for example, 28% oxygen concentration. If the oxygen concentration is higher than the first threshold and the system is operating in second mode, it switches from second mode to first mode. Also, if the oxygen concentration is lower than the second threshold and the system is operating in first mode, it switches from first mode to second mode.

[0081] Here, as in Example 2, the first mode is a state in which the outside air vent 411 is open and the auxiliary outside air vent 414 is closed by the upper outside air louver 415.

[0082] Furthermore, similar to Example 2, the second mode is a state in which the auxiliary outside air vent 414 is open and the outside air vent 411 is controlled to be closed by the lower outside air louver 412.

[0083] Here, we will explain the specific control operation with reference to Figure 10. Figure 10 is a flowchart showing another processing procedure by the oxygen supply system 1000.

[0084] First, control is initiated after the oxygen supply device 300 and ventilation device 400 have started operating. After operation begins, the system detects whether or not the oxygen concentration in the sleep space 10a has increased at predetermined intervals (S254). If the oxygen concentration in the sleep space 10a has increased (Y in S254), it is determined whether the obtained oxygen concentration is above the first threshold (S255). If it is above the first threshold (Y in S255), the system switches to the first mode to operate in a way that makes it easier to ventilate the sleep space 10a and suppresses the increase in oxygen concentration (S251). If it is below the first threshold (N in S255), the system continues in the second mode and operates in a way that increases the oxygen concentration in the sleep space 10a (S253). After that, the control flowchart ends once, and control is restarted after a predetermined time.

[0085] Furthermore, if the oxygen concentration in the sleep space 10a decreases after the start of operation (N in S254), it is determined whether the obtained oxygen concentration is above the second threshold (S256). If it is above the second threshold (Y in S256), the first mode is continued, and the system is operated in a way that facilitates ventilation of the sleep space 10a and suppresses the increase in the oxygen concentration in the sleep space 10a (S258). If it is below the second threshold (N in S256), the system is switched to the second mode, and the system is operated in a way that increases the oxygen concentration in the sleep space 10a (S259). After that, the control flowchart ends once, and control is restarted after a predetermined time.

[0086] To determine whether the oxygen concentration is increasing, the oxygen concentration in the sleep space 10a may be obtained from the oxygen sensor 105, or the mode set in the opening / closing control unit 213 may be checked to see if it is the second mode. If the mode set in the opening / closing control unit 213 is the second mode, it is a mode in which the oxygen concentration increases, and if it is the first mode, it is a mode in which the oxygen concentration is maintained or decreases.

[0087] To explain using specific values, for example, if the first threshold oxygen concentration is 32% and the second threshold oxygen concentration is 28%, then if the oxygen concentration in S254 increases from 30% to 33% after a few minutes (a 3% increase in oxygen concentration from the previous time), the process moves to flow Y in S254, and from S155, it is determined that the first threshold of 32% or higher is met (Y in S255), and the system switches to the first mode (S251). After that, the operation ends once and returns to the start again.

[0088] Furthermore, if the oxygen concentration drops from 33% to 30% after a few minutes (a 3% decrease from the previous reading), the first mode continues because the oxygen concentration is below 32% of the first threshold and above 28% of the second threshold (S258).

[0089] If the oxygen concentration drops from 30% to 27% after a few minutes (a 3% decrease from the previous reading), the oxygen concentration is below the second threshold of 28%, and the system switches from the first mode to the second mode (S259).

[0090] In this way, having multiple thresholds makes it possible to control the oxygen concentration within a certain range. Compared to the case with a single threshold, the frequency of opening and closing of the upper outside air louvers 415 and the lower outside air louvers 412 is reduced, enabling power-saving operation.

[0091] Similar to Example 2, the increase and decrease in oxygen concentration and CO2 concentration may be controlled not only by switching between the first and second modes, but also by adjusting the output of the oxygen supply device 300 and the ventilation device 400. For example, if the oxygen concentration in the sleep space 10a is lower than the second threshold, the output of the oxygen supply device 300 may be increased while the second mode is in operation. In other words, by increasing the output of the oxygen supply device 300, it is possible to approach the first threshold more quickly.

[0092] As described above, the modified oxygen supply system 1000 can provide the following benefits. (1) The oxygen supply system 1000 includes an open / close control unit 213 that selectively opens and closes either the outside air port 411 or the auxiliary outside air port 414, and an oxygen sensor 105 that detects the oxygen concentration in the sleeping space 10a. The open / close control unit 213 is capable of switching between a first mode in which the outside air port 411 is open and the auxiliary outside air port 414 is closed, and a second mode in which the auxiliary outside air port 414 is open and the outside air port 411 is closed. The system is configured to switch from the second mode to the first mode when the oxygen concentration detected by the oxygen sensor 105 is above a first threshold when the system is in the second mode, and to switch from the first mode to the second mode when the oxygen concentration detected by the oxygen sensor is below a second threshold which is lower than the first threshold when the system is in the first mode.

[0093] With this configuration, the oxygen concentration in the sleep space 10a can be detected by the oxygen sensor 105, and controlled to stay within the range between the first and second thresholds, thereby stabilizing the oxygen concentration. In addition, compared to the case where there is only one threshold, the frequency of opening and closing of the upper outside air louvers 415 and the lower outside air louvers 412 can be reduced, enabling power-saving operation.

[0094] Furthermore, the oxygen supply system 1000 may be configured such that the opposing surface of the sleeping space 10a (the rear side surfaces 11c and 11i in Figures 2 and 5) is close to the head 22 of the user 20.

[0095] This configuration brings the user 20 closer to the oxygen supply port 304, making it possible to efficiently increase the oxygen concentration around the user 20's face. Therefore, a localized high-concentration oxygen space can be stably created around the user 20's face. In addition, the outside air port 411 is positioned on the surface opposite the oxygen supply port 304 (front side surfaces 11d and 11j in Figures 2 and 5). In other words, the outside air port 411 is positioned close to the user 20's feet, resulting in the oxygen supply port 304 and the outside air port 411 being as far apart as possible, making interference between the airflow 600 (600a) and the oxygen flow 306 less likely.

[0096] Although the present disclosure has been explained above based on the examples, it can be easily inferred that the present disclosure is not limited in any way to the above examples, and that various improvements and modifications are possible without departing from the spirit of the present disclosure.

[0097] Regarding the terminology used above, the sleeping spaces 10 and 10a in this embodiment correspond to the "sleeping space" in the claim, the oxygen supply device 300 corresponds to the "oxygen supply device" in the claim, the ventilation device 400 corresponds to the "ventilation device" in the claim, the oxygen supply port 304 corresponds to the "oxygen supply port" in the claim, the ventilation port 404 corresponds to the "ventilation port" in the claim, and the oxygen supply system 1000 corresponds to the "oxygen supply system" in the claim. In addition, the outside air port 411 corresponds to the "outside air port" in the claim, the floor surfaces 11b and 11h correspond to the "floor surface" in the claim, the top surfaces 11a and 11g correspond to the "top surface" in the claim, the front side surfaces 11d and 11j correspond to the "one side surface" in the claim, and the rear side surfaces 11c and 11i correspond to the "opposing surface" in the claim. Also, the downward outside air louver 41 2 and the ventilation louver 413 correspond to the "outside airflow adjustment unit" of the claim, the auxiliary outside air vent 414 corresponds to the "auxiliary outside air vent" of the claim, the opening / closing control unit 213 corresponds to the "open / close control unit" of the claim, the oxygen sensor 105 corresponds to the "oxygen sensor" of the claim, and the CO2 sensor 106 corresponds to the "CO2 sensor" of the claim. [Industrial applicability]

[0098] As described above, the oxygen supply system according to this embodiment is useful as an oxygen supply system that efficiently increases the oxygen concentration around the user's face while releasing CO2, in situations where it is difficult to raise the oxygen concentration in a well-ventilated space. [Explanation of Symbols]

[0099] 5, 5a Enclosure 10 Sleeping space 10a sleeping space 11a Top surface 11b Floor surface 11c rear side 11d Front side 11e Left side 11th floor, right side 11g Top surface 11h Floor surface 11i rear side 11j Front side 11k left side 11l Right side 12 Entrance / exit 13 Opening and closing doors 13a Opening and closing door 20 User 22 heads 105 Oxygen Sensor 106 CO2 Sensor 200 Control device 201 Oxygen concentration acquisition unit 202 CO2 concentration acquisition section 210 Oxygen concentration control unit 212 CO2 concentration control unit 213 Opening / Closing Control Unit 300 Oxygen supply device 302 Oxygen supply duct 304 Oxygen supply port 305 Oxygen flow path adjustment section 306 Oxygen flow 400 Ventilation system 402 Ventilation duct 404 Ventilation vent 411 Outdoor air vent 412 Downward outside air louvers 413 Ventilation Louver 414 Auxiliary outside air vent 415 Upward outside air louvers 600 airflow 600a airflow 600b Airflow 1000 Oxygen Supply System

Claims

1. An oxygen supply system that supplies oxygen to the sleeping space where the user sleeps, A housing having a sleeping space as an internal space, partitioned by a floor surface, a top surface facing the floor surface, and a plurality of sides connecting the floor surface and the top surface, The sleeping space is equipped with a ventilation device for ventilating the air in the sleeping space, The aforementioned enclosure is An outside air vent for supplying outside air, which is the air outside the enclosure, to the sleeping space, An oxygen supply port for supplying oxygen from the outside of the housing to the sleeping space, It includes a ventilation opening connected to the ventilation device for exhausting the air from the sleeping space, The aforementioned outside air vent is, Provided on one of the aforementioned plurality of sides, The oxygen supply port is Provided on the opposing surface facing the aforementioned one side, The aforementioned ventilation opening is An oxygen supply system located above the aforementioned outside air inlet and oxygen supply port.

2. The aforementioned enclosure is The oxygen supply system according to claim 1, further comprising an outside air flow path adjustment unit for guiding the outside air supplied from the outside air inlet to an area above the oxygen supply port.

3. The aforementioned enclosure is The oxygen supply system according to claim 1, further comprising an auxiliary outside air port located above the outside air port and the oxygen supply port on one of the aforementioned sides.

4. The system includes an opening / closing control unit that selectively opens and closes either the aforementioned outside air vent or the aforementioned auxiliary outside air vent, and the opening / closing control unit is It is possible to switch between a first mode in which the main outside air vent is open and the auxiliary outside air vent is closed, and a second mode in which the auxiliary outside air vent is open and the main outside air vent is closed. The oxygen supply system according to claim 3, which switches between the first mode and the second mode at predetermined intervals.

5. An opening / closing control unit that selectively opens and closes either the above-mentioned outside air vent or the above-mentioned auxiliary outside air vent, The system includes an oxygen sensor for detecting the oxygen concentration in the aforementioned sleep space. The opening / closing control unit, It is possible to switch between a first mode in which the main outside air vent is open and the auxiliary outside air vent is closed, and a second mode in which the auxiliary outside air vent is open and the main outside air vent is closed. The oxygen supply system according to claim 3, wherein if the oxygen concentration detected by the oxygen sensor is above a predetermined threshold, the system is controlled in the first mode, and if the oxygen concentration detected by the oxygen sensor is below a predetermined threshold, the system is controlled in the second mode.

6. An opening / closing control unit that selectively opens and closes either the above-mentioned outside air vent or the above-mentioned auxiliary outside air vent, The system includes a CO2 sensor for detecting the CO2 concentration in the aforementioned sleep space, The opening / closing control unit, It is possible to switch between a first mode in which the main outside air vent is open and the auxiliary outside air vent is closed, and a second mode in which the auxiliary outside air vent is open and the main outside air vent is closed. The oxygen supply system according to claim 3, wherein if the CO2 concentration detected by the CO2 sensor is above a predetermined threshold, the system is controlled in the first mode, and if the CO2 concentration detected by the CO2 sensor is below a predetermined threshold, the system is controlled in the second mode.

7. An opening / closing control unit that selectively opens and closes either the above-mentioned outside air vent or the above-mentioned auxiliary outside air vent, The system includes an oxygen sensor for detecting the oxygen concentration in the aforementioned sleep space. The opening / closing control unit, It is possible to switch between a first mode in which the main outside air vent is open and the auxiliary outside air vent is closed, and a second mode in which the auxiliary outside air vent is open and the main outside air vent is closed. If the second mode is active and the oxygen concentration detected by the oxygen sensor is equal to or greater than the first threshold, the system switches from the second mode to the first mode. The oxygen supply system according to claim 3, wherein in the first mode, if the oxygen concentration detected by the oxygen sensor is less than a second threshold which is lower than the first threshold, the system switches from the first mode to the second mode.

8. The oxygen supply system according to any one of claims 1 to 7, wherein the opposing surface is in close proximity to the user's head.

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