Three-way valve and oxygen concentration device

Abstract

A three-way valve (10) is provided with a manifold (50) in which a flow path is formed, the flow path comprising a gas supply port (71), a gas supply passage (75), a gas discharge port (72), a gas discharge passage (76), gas supply / discharge ports (73, 74), gas supply / discharge passages (77, 78), a valve chamber (51), and a valve chamber (52), a valve body (23) and a valve body (24) housed in the valve chambers (51, 52), and a pilot mechanism (30) in which the valve body (23) and the valve body (24) are connected to the gas supply port (71), the gas supply passage (75), the gas discharge port (72) and the gas discharge passage (76). And a pilot mechanism (30) for switching the positions of the valve elements (23, 24) to the first position (P1) or the second position (P2), the pilot mechanism (30) being capable of being displaced between the first position (P1) at which the air supply port (71) communicates with the exhaust passages (77, 78) or between the second position (P2) at which the exhaust port (72) communicates with the air supply and exhaust passages (77, 78), and the manifold (50) being configured by stacking a plurality of plate-shaped manifold members (60) in the plate thickness direction.

Description

Technical Field

[0001] The present disclosure relates to a three-way valve and an oxygen concentrator including the three-way valve. Background Art

[0002] An oxygen concentrator is known that generates high-concentration oxygen containing oxygen at a higher concentration than in the air and supplies it to a user. The oxygen concentrator is used, for example, when a patient (user) with a disease in the lungs and a reduced lung function undergoes oxygen therapy.

[0003] In a conventional oxygen concentrator, a three-way valve is used as a control valve for pressurizing and exhausting cycles of two adsorption cylinders. As a three-way valve used in an oxygen concentrator, for example, the three-way valve disclosed in Patent Document 1 is known. The three-way valve disclosed in Patent Document 1 is an internally piloted three-way valve. The internally piloted three-way valve includes: a valve element including a connecting rod and a diaphragm; a manifold having a space for accommodating the valve element and a flow path for air formed therein; and a pilot valve for switching a target for applying a pilot pressure, etc., and is configured to move the valve element by the pilot pressure to switch a flow path communicating with two adsorption cylinders to a pressurizing side and an exhausting side. In addition, the three-way valve disclosed in Patent Document 1 is a dual three-way valve having a structure in which two three-way valves are connected integrally (hereinafter, also referred to as an internally piloted dual three-way valve). Prior Art Documents Patent Documents

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-168087 Summary of the Invention Technical Problem to be Solved by the Invention

[0005] Generally, various devices such as oxygen concentrators tend to be further miniaturized and lightened. However, in a device having the three-way valve, the size and weight of the three-way valve sometimes become the main reasons for hindering further miniaturization and lightening of the device.

[0006] An object of the present disclosure is to provide a three-way valve and an oxygen concentrator that are more miniaturized and lightened than in the past. Technical Solution for Solving the Technical Problem

[0007] (1) The three-way valve of the present disclosure includes: a manifold formed with a flow path, the flow path including a first port, a first passage connected to the first port, a second port, a second passage connected to the second port, a third port, a third passage connected to the third port, and a valve chamber communicating with the first passage, the second passage, and the third passage; a valve element received in the valve chamber and capable of being displaced to a first position where the first port and the third port communicate or a second position where the second port and the third port communicate; and a switching mechanism that switches the position of the valve element to the first position or the second position, and the manifold is formed by laminating a plurality of plate-like manifold members in the plate thickness direction.

[0008] In the three-way valve according to the present disclosure, by adopting a manifold having a laminated structure, it is possible to make the cross-sectional shape of the passages constituting each flow path in the manifold a shape other than a circle, and it is possible to improve the space efficiency in the manifold (the ratio of the space to be ensured in the manifold to the volume of the manifold). Thereby, it is possible to achieve miniaturization and weight reduction of the three-way valve.

[0009] (2) Preferably, in the three-way valve of (1) of the present disclosure, the flow path formed in the manifold includes: a first valve chamber as the first of the valve chambers; a second valve chamber as the second of the valve chambers; a first communication path that communicates the first valve chamber with the second valve chamber and is connected to the first passage; a second communication path that communicates the first valve chamber with the second valve chamber and is connected to the second passage; a first valve chamber side third port as the third port on the first valve chamber side; a first valve chamber side third passage as the third passage on the first valve chamber side; a second valve chamber side third port as the third port on the second valve chamber side; and a second valve chamber side third passage as the third passage on the second valve chamber side, and the valve element includes a first valve element as the first of the valve elements and a second valve element as the second of the valve elements, the first valve element is received in the first valve chamber, and the second valve element is received in the second valve chamber.

[0010] In this case, it is possible to achieve miniaturization and weight reduction when the three-way valve is a double three-way valve.

[0011] (3) In the three-way valve of (2) of the present disclosure, preferably, the first communication path and / or the second communication path is formed by a depression on the boundary surface between adjacent manifold members.

[0012] In this case, by forming the manifold into a laminated structure, it is possible to form the first communication path and the second communication path at the boundary portion of the manifold members. Thereby, it is possible to improve the space efficiency in the manifold and miniaturize the manifold.

[0013] (4) In the three-way valve of (2) or (3) of the present disclosure, preferably, the flow path formed in the manifold further includes: a first pilot passage communicating with the first valve chamber; a second pilot passage communicating with the second valve chamber; and a third pilot passage connecting the first pilot passage or the second pilot passage to the first passage. The first valve element further has a first diaphragm and a second diaphragm, and the first diaphragm and the second diaphragm can be deformed by the pressure of the fluid supplied to the first valve chamber via the first pilot passage. The second valve element further has a third diaphragm and a fourth diaphragm, and the third diaphragm and the fourth diaphragm can be deformed by the pressure of the fluid supplied to the second valve chamber via the second pilot passage. The switching mechanism is constituted by a pilot valve, and the communication target of the third pilot passage is switched to either the first pilot passage or the second pilot passage by the pilot valve, so that either the first valve element or the second valve element is located at the first position and the other of the first valve element and the second valve element is located at the second position by the deformation of the first diaphragm and the second diaphragm and the third diaphragm and the fourth diaphragm.

[0014] In this case, it is possible to achieve miniaturization and weight reduction in the case where the three-way valve is a pilot-operated three-way valve that operates by pilot pressure.

[0015] (5) In the three-way valve of (4) of the present disclosure, preferably, the flow path formed in the manifold further includes a fourth pilot passage that connects the first pilot passage or the second pilot passage to the second passage. The pilot valve switches the communication target of the fourth pilot passage to either the first pilot passage or the second pilot passage, so as to deform the first diaphragm and the second diaphragm or the third diaphragm and the fourth diaphragm.

[0016] In this case, it is possible to improve the reliability of the operation of the first valve element and the second valve element when sucking and exhausting from the second port.

[0017] (6) In the three-way valve of (4) of the present disclosure, preferably, the first valve element includes: a first connecting rod; a first diaphragm connected to one end of the first connecting rod; a second diaphragm connected to the other end of the first connecting rod; a first valve portion provided on the first diaphragm; and a second valve portion provided on the second diaphragm. The second valve element includes: a second connecting rod; a third diaphragm connected to one end of the second connecting rod; a fourth diaphragm connected to the other end of the second connecting rod; a third valve portion provided on the third diaphragm; and a fourth valve portion provided on the fourth diaphragm. The first valve chamber has: a first chamber for accommodating the first diaphragm; a second chamber for accommodating the second diaphragm; a first communication hole that communicates the first chamber and the second chamber and accommodates the first connecting rod; a first valve seat formed at an end of the first communication hole on the first chamber side and opposed to the first valve portion; and a second valve seat formed at an end of the first communication hole on the second chamber side and opposed to the second valve portion. The second valve chamber has: a third chamber for accommodating the third diaphragm; a fourth chamber for accommodating the fourth diaphragm; a second communication hole that communicates the third chamber and the fourth chamber and accommodates the second connecting rod; a third valve seat formed at an end of the second communication hole on the third chamber side and opposed to the third valve portion; and a fourth valve seat formed at an end of the second communication hole on the fourth chamber side and opposed to the fourth valve portion. The first communication path communicates the second chamber and the fourth chamber, the second communication path communicates the first chamber and the third chamber, the third pilot passage communicates with the first passage via the first communication path, and the fourth pilot passage communicates with the second passage via the second communication path.

[0018] In this case, it is possible to achieve miniaturization and weight reduction when the three-way valve is an internally piloted double three-way valve.

[0019] (7) In the three-way valve of (6) of the present disclosure, preferably, in the manifold, the axial directions of the first communication hole and the second communication hole are parallel to the stacking direction of the plurality of manifold members, and the first chamber, the second chamber, the third chamber, the fourth chamber, the first communication hole, and the second communication hole are formed across two or more of the manifold members.

[0020] In this case, it is possible to configure an internally piloted double three-way valve using a manifold having a stacked structure. Thereby, it is possible to miniaturize and weight-reduce the internally piloted double three-way valve.

[0021] (8) The oxygen concentration device of the present disclosure is an oxygen concentration device that generates high-concentration oxygen having an oxygen concentration higher than that in air and supplies the generated high-concentration oxygen. It includes: an adsorption material that can adsorb nitrogen or oxygen contained in air and desorb the adsorbed nitrogen or oxygen; a first adsorption cylinder and a second adsorption cylinder that house the adsorption material; an air supply pipe that supplies air, which is a raw material for high-concentration oxygen, to the first adsorption cylinder and the second adsorption cylinder; an exhaust pipe that exhausts the generated high-concentration oxygen from the first adsorption cylinder and the second adsorption cylinder; and a switching valve that alternately selects the first adsorption cylinder or the second adsorption cylinder and, while connecting the selected one to the air supply pipe, connects the other to the exhaust pipe. The switching valve is constituted by the three-way valve described in the above (4).

[0022] In this case, miniaturization and weight reduction of the oxygen concentration device can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic view showing the three-way valve (first embodiment) of the present disclosure. Figure 2 It is a perspective schematic view showing the three-way valve (first embodiment) of the present disclosure. Figure 3A It is a top view showing the first manifold member of the first three-way valve. Figure 3B It is a bottom view showing the first manifold member of the first three-way valve. Figure 3C It is a rear view showing the first manifold member of the first three-way valve. Figure 4A It is a top view showing the second manifold member of the first three-way valve. Figure 4B It is a bottom view showing the second manifold member of the first three-way valve. Figure 5A It is a top view showing the third manifold member of the first three-way valve. Figure 5B It is a bottom view showing the third manifold member of the first three-way valve. Figure 6A It is a top view showing the fourth manifold member of the first three-way valve. Figure 6B It is a bottom view showing the fourth manifold member of the first three-way valve. Figure 7A It is an explanatory diagram of the operation (first mode) of the three-way valve of the present disclosure. Figure 7B It is an explanatory diagram of the operation (second mode) of the three-way valve of the present disclosure. Figure 8 It is a schematic cross-sectional view showing a three-way valve (second embodiment) of the present disclosure. Figure 9 It is a schematic perspective view showing a three-way valve (second embodiment) of the present disclosure. Figure 10A It is a top view showing a first manifold member of a second three-way valve. Figure 10B It is a bottom view showing a first manifold member of a second three-way valve. Figure 10C It is a rear view showing a first manifold member of a second three-way valve. Figure 11A It is a top view showing a second manifold member of a second three-way valve. Figure 11B It is a bottom view showing a second manifold member of a second three-way valve. Figure 12A It is a top view showing a third manifold member of a second three-way valve. Figure 12B It is a bottom view showing a third manifold member of a second three-way valve. Figure 13A It is a top view showing a fourth manifold member of a second three-way valve. Figure 13B It is a bottom view showing a fourth manifold member of a second three-way valve. Figure 14A It is a top view showing a fifth manifold member of a second three-way valve. Figure 14B It is a bottom view showing a fifth manifold member of a second three-way valve. Figure 15 It is an explanatory diagram of an oxygen concentrator according to an embodiment of the present disclosure. Figure 16 It is a block diagram for explaining the oxygen concentration process of the oxygen concentrator. Figure 17 It is a diagram for explaining the relationship between the pressure change in one cycle of the adsorption cylinder and the switching state of the control valve of the oxygen concentrator. Detailed Embodiments

[0024] Hereinafter, with reference to the accompanying drawings, an oxygen supply device of the present disclosure will be described in detail. In addition, the present disclosure is not limited to these examples, but is shown in the form of claims, and is intended to include meanings equivalent to the claims and all changes within their scope.

[0025] [Overall Structure of the Three-Way Valve (First Embodiment) of the Present Disclosure] Figure 1 It is a schematic cross-sectional view showing a three-way valve (first embodiment) of the present disclosure. Figure 2is a perspective schematic diagram showing a three-way valve of the present disclosure. In Figure 1 and Figure 2 a three-way valve 10 is shown as an example of the three-way valve of the present disclosure. Figure 1 The three-way valve 10 shown is the three-way valve 10 of the first embodiment of the present disclosure, and in the following description, it is also referred to as the first three-way valve 10A. In addition, in the following description, when simply referred to as the "three-way valve 10", the structures common to the first three-way valve 10A of the first embodiment and the three-way valve of the second embodiment (the second three-way valve 10B described later) will be described.

[0026] Figure 1 and Figure 2 The three-way valve 10 shown is an internally piloted double three-way valve. In the present embodiment, the three-way valve 10, which is an internally piloted double three-way valve, is exemplified to describe the three-way valve of the present disclosure. In addition, in the present embodiment, the three-way valve 10, which is an internally piloted double three-way valve, is exemplified for description, but the three-way valve of the present disclosure may also be a single (non-double) three-way valve, or may not be a three-way valve that operates by pilot pressure.

[0027] As Figure 1 and Figure 2 shown, the three-way valve 10 includes a control valve 20, a pilot mechanism 30, and a manifold 50. In the three-way valve 10 of the present embodiment, the control valve 20 includes a first control valve 21 and a second control valve 22. In the three-way valve 10 of the present embodiment, the pilot mechanism 30 includes a first pilot valve 31 and a second pilot valve 32. The manifold 50 includes a first valve chamber 51 that houses the first control valve 21 and a second valve chamber 52 that houses the second control valve 22. Thus, Figure 1 and Figure 2 the three-way valve 10 shown is a piloted double three-way valve including a pair of first control valves 21 and second control valves 22, and a pair of first pilot valves 31 and second pilot valves 32. In the present embodiment, the three-way valve 10, which is an internally piloted double three-way valve, is exemplified to describe the three-way valve of the present disclosure. In addition, in the following description, for the three-way valve 10, the X direction, Y direction, and Z direction are defined as follows. The X direction in this description is the direction including the arrangement direction of the first control valve 21 and the second control valve 22 and the direction parallel thereto. The Z direction in this description is the direction including the displacement direction of each spool (the first spool 23 and the second spool 24 described later) of the first control valve 21 and the second control valve 22 and the direction parallel thereto. The Y direction is the direction perpendicular to the X direction and the Z direction. In the following description, the direction indicated by the arrow in the X direction in each figure is also referred to as the right side and the opposite direction as the left side, the direction indicated by the arrow in the Y direction as the front side and the opposite direction as the rear side, and the direction indicated by the arrow in the Z direction as the upper side and the opposite direction as the lower side.

[0028] (Regarding the control valve) As Figure 1 and Figure 2 shown, the three-way valve 10 includes a first control valve 21 and a second control valve 22 arranged in the left-right direction (X direction).

[0029] The first control valve 21 includes a first valve element 23. The first valve element 23 includes a first connecting rod 23a, a first diaphragm 23b fixed to one end of the first connecting rod 23a, a second diaphragm 23c fixed to the other end of the first connecting rod 23a, a first valve portion 23d provided on the first diaphragm 23b side of the first connecting rod 23a, and a second valve portion 23e provided on the second diaphragm 23c side of the first connecting rod 23a. The first valve element 23 is housed in the first valve chamber 51 of the manifold 50 with the axial direction of the first connecting rod 23a facing the Z direction. The first diaphragm 23b divides the first chamber A1, and a pilot chamber A1a is formed on one side (the upper side in this embodiment) sandwiching the first diaphragm 23b. The first diaphragm 23b deforms in the first chamber A1 according to the pressure of the pilot fluid supplied to the pilot chamber A1a. The first connecting rod 23a is displaced in the Z direction along with the deformation of the first diaphragm 23b. The second diaphragm 23c deforms in the second chamber A2 along with the displacement of the first connecting rod 23a.

[0030] The second control valve 22 includes a second valve element 24. The second valve element 24 includes a second connecting rod 24a, a third diaphragm 24b fixed to one end of the second connecting rod 24a, a fourth diaphragm 24c fixed to the other end of the second connecting rod 24a, a third valve portion 24d provided on the third diaphragm 24b side of the second connecting rod 24a, and a fourth valve portion 24e provided on the fourth diaphragm 24c side of the second connecting rod 24a. The second valve element 24 is housed in the second valve chamber 52 of the manifold 50 with the axial direction of the second connecting rod 24a facing the Z direction. The third diaphragm 24b divides the third chamber A3, and a pilot chamber A3a is formed on one side (the upper side in this embodiment) sandwiching the third diaphragm 24b. The third diaphragm 24b deforms in the third chamber A3 according to the pressure of the pilot fluid supplied to the pilot chamber A3a. The second connecting rod 24a is displaced in the Z direction along with the deformation of the third diaphragm 24b. The fourth diaphragm 24c deforms in the fourth chamber A4 along with the displacement of the second connecting rod 24a.

[0031] (Regarding the pilot valve) The first pilot valve 31 is an electromagnetic valve that controls the displacement (position switching) of the first valve element 23. The second pilot valve 32 is an electromagnetic valve that controls the displacement (position switching) of the second valve element 24. Both the first pilot valve 31 and the second pilot valve 32 in this embodiment are three-port valves. In addition, in Figure 1 and (as described later in Figure 8In (China), numbers such as "1", "2", or "3" marked near the first pilot valve 31 and the second pilot valve 32 indicate the port numbers of the valves.

[0032] (Regarding the manifold) As Figure 1 and Figure 2 shown, in the manifold 50, the first valve chamber 51 that houses the first valve element 23 includes: a first chamber A1 that houses the first diaphragm 23b; a second chamber A2 that houses the second diaphragm 23c; and a first communication hole B1, which is a space that connects the first chamber A1 and the second chamber A2 and houses the first connecting rod 23a. The manifold 50 includes a first valve seat 53 formed at the end of the first communication hole B1 on the first chamber A1 side and a second valve seat 54 formed at the end of the first communication hole B1 on the second chamber A2 side in the first valve chamber 51. The first communication hole B1 is formed such that its axial direction is parallel to the Z direction. In the first valve chamber 51, the first valve element 23 is configured to be displaceable in the Z direction.

[0033] The first valve seat 53 faces the first valve portion 23d of the first diaphragm 23b housed in the first chamber A1. When the first valve portion 23d of the first control valve 21 is separated from the first valve seat 53, fluid can flow between the first chamber A1 (the portion on the other side (below) sandwiching the first diaphragm 23b) and the first communication hole B1. When the first valve portion 23d and the first valve seat 53 are in close contact, fluid cannot flow between the first chamber A1 and the first communication hole B1. The second valve seat 54 faces the second valve portion 23e of the second diaphragm 23c housed in the second chamber A2. When the second valve portion 23e of the first control valve 21 is separated from the second valve seat 54, fluid can flow between the second chamber A2 and the first communication hole B1. When the second valve portion 23e and the second valve seat 54 are in close contact, fluid cannot flow between the second chamber A2 and the first communication hole B1.

[0034] The position of the first control valve 21 where the first valve portion 23d and the first valve seat 53 are in close contact and the second valve portion 23e is separated from the second valve seat 54 is referred to as the first position P1, and the position where the first valve portion 23d is separated from the first valve seat 53 and the second valve portion 23e is in close contact with the second valve seat 54 is referred to as the second position P2.

[0035] In the manifold 50, the second valve chamber 52 that houses the second valve element 24 includes: a third chamber A3 that houses the third diaphragm 24b; a fourth chamber A4 that houses the fourth diaphragm 24c; and a second communication hole B2, which is a space that communicates the third chamber A3 with the fourth chamber A4 and houses the second connecting rod 24a. The manifold 50 includes a third valve seat 55 formed at an end of the second communication hole B2 on the side of the third chamber A3 in the second valve chamber 52 and a fourth valve seat 56 formed at an end of the second communication hole B2 on the side of the fourth chamber A4. The second communication hole B2 is formed such that its axial direction is parallel to the Z direction. In the second valve chamber 52, the second valve element 24 is configured to be displaceable in the Z direction.

[0036] The third valve seat 55 faces the third valve portion 24d of the third diaphragm 24b housed in the third chamber A3. When the third valve portion 24d and the third valve seat 55 are separated, fluid can flow between the third chamber A3 (the portion on the other side (below) sandwiching the third diaphragm 24b) and the second communication hole B2 in the second control valve 22. When the third valve portion 24d and the third valve seat 55 are in close contact, fluid cannot flow between the third chamber A3 and the second communication hole B2. The fourth valve seat 56 faces the fourth valve portion 24e of the fourth diaphragm 24c housed in the fourth chamber A4. When the fourth valve portion 24e and the fourth valve seat 56 are separated, fluid can flow between the fourth chamber A4 and the second communication hole B2 in the second control valve 22. When the fourth valve portion 24e and the fourth valve seat 56 are in close contact, fluid cannot flow between the fourth chamber A4 and the second communication hole B2.

[0037] The position in the second control valve 22 where the third valve portion 24d and the third valve seat 55 are in close contact and the fourth valve portion 24e and the fourth valve seat 56 are separated is referred to as the first position P1, and the position where the third valve portion 24d and the third valve seat 55 are separated and the fourth valve portion 24e and the fourth valve seat 56 are in close contact is referred to as the second position P2. In other words, in the first control valve 21 and the second control valve 22, the position when the first valve element 23 and the second valve element 24 are displaced to the uppermost side is referred to as the second position P2, and the position when the first valve element 23 and the second valve element 24 are displaced to the lowermost side is referred to as the first position P1.

[0038] The manifold 50 internally forms a second communication path C2 that communicates the first chamber A1 with the third chamber A3 and a first communication path C1 that communicates the second chamber A2 with the fourth chamber A4.

[0039] The manifold 50 includes an air supply port 71, an exhaust port 72, a first air supply / exhaust port 73, and a second air supply / exhaust port 74 on its outer surface. The three-way valve 10 of the present disclosure switches the positions of the first valve element 23 of the first control valve 21 and the second valve element 24 of the second control valve 22, while connecting either the first air supply / exhaust port 73 or the second air supply / exhaust port 74 to the air supply port 71, and connecting the other of the first air supply / exhaust port 73 and the second air supply / exhaust port 74 to the exhaust port 72. In addition, the three-way valve 10 of the present embodiment shares the air supply port 71 and the exhaust port 72 between the first control valve 21 and the second control valve 22, but may also be configured such that the first control valve 21 has dedicated air supply and exhaust ports and the second control valve 22 has dedicated air supply and exhaust ports.

[0040] Inside the manifold 50, there are provided: an air supply passage 75 that connects the air supply port 71 to the first communication path C1; an exhaust passage 76 that connects the exhaust port 72 to the second communication path C2; a first air supply / exhaust passage 77 that connects the first air supply / exhaust port 73 to the first valve chamber 51; and a second air supply / exhaust passage 78 that connects the second air supply / exhaust port 74 to the second valve chamber 52.

[0041] On its outer surface, the manifold 50 includes a first pilot port 81, a second pilot port 82, and a third pilot port 83 for connecting the first pilot valve 31, and a fourth pilot port 84, a fifth pilot port 85, and a sixth pilot port 86 for connecting the second pilot valve 32. The manifold 50 includes: a first pilot passage 91 that connects the first pilot port 81 to the first valve chamber 51; a second pilot passage 92 that connects the fourth pilot port 84 to the second valve chamber 52; a third pilot passage 93 that connects the second pilot port 82 and the fifth pilot port 85 to the first communication path C1; and a fourth pilot passage 94 that connects the third pilot port 83 and the sixth pilot port 86 to the second communication path C2.

[0042] As Figure 1 shown, the first pilot valve 31 and the second pilot valve 32 are three-port valves. The first pilot valve 31 is attached to the rear surface of the manifold 50 in such a way that the first port "1" is connected to the first pilot passage 91, the second port "2" is connected to the third pilot passage 93, and the third port "3" is connected to the fourth pilot passage 94. The second pilot valve 32 is attached to the rear surface of the manifold 50 in such a way that the first port "1" is connected to the second pilot passage 92, the second port "2" is connected to the third pilot passage 93, and the third port "3" is connected to the fourth pilot passage 94.

[0043] [Regarding the manifold of the three-way valve of the first embodiment] Figure 3A is a top view showing the first manifold member of the first three-way valve. Figure 3BIt is a bottom view of the first manifold member representing the first three-way valve. Figure 3C It is a rear view of the first manifold member representing the first three-way valve. Figure 4A It is a top view of the second manifold member representing the first three-way valve. Figure 4B It is a bottom view of the second manifold member representing the first three-way valve. Figure 5A It is a top view of the third manifold member representing the first three-way valve. Figure 5B It is a bottom view of the third manifold member representing the first three-way valve. Figure 6A It is a top view of the fourth manifold member representing the first three-way valve. Figure 6B It is a bottom view of the fourth manifold member representing the first three-way valve. As Figure 1 and Figure 2 shown, the manifold 50 constituting the first three-way valve 10A is composed of four plate-like manifold members 60. Additionally, in the following description, the manifold 50 of the first three-way valve 10A will also be referred to as the first manifold 50A.

[0044] The first manifold 50A is composed of a first manifold member 60 (hereinafter referred to as the first manifold member 61A), a second manifold member 60 (hereinafter referred to as the second manifold member 62A), a third manifold member 60 (hereinafter referred to as the third manifold member 63A), and a fourth manifold member 60 (hereinafter referred to as the fourth manifold member 64A).

[0045] The first manifold 50A is formed by laminating in the plate thickness direction in the order of the first manifold member 61A, the second manifold member 62A, the third manifold member 63A, and the fourth manifold member 64A starting from the upper side in the axial direction (Z direction) of the first connecting rod 23a housed in the first valve chamber 51 and the second connecting rod 24a housed in the second valve chamber 52.

[0046] As Figure 1 and Figure 3A 、 3B shown, a part of the first chamber A1, a part of the third chamber A3, the first pilot port 81, the second pilot port 82, the third pilot port 83, the fourth pilot port 84, the fifth pilot port 85, the sixth pilot port 86, a part of the first pilot passage 91, a part of the second pilot passage 92, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the first manifold member 61A.

[0047] As Figure 1 and Figure 4A 、 4BAs shown, a part of the first chamber A1, a part of the third chamber A3, a part of the first communication hole B1, a part of the second communication hole B2, a part of the first communication path C1, a part of the second communication path C2, the first valve seat 53, the third valve seat 55, a part of the first air supply and exhaust passage 77, a part of the second air supply and exhaust passage 78, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the second manifold member 62A.

[0048] In the first manifold 50A, the first chamber A1 and the third chamber A3 are formed across the two manifold members 60 and are constituted by the first manifold member 61A and the second manifold member 62A.

[0049] As Figure 1 and Figure 5A 、 5B shown, a part of the second chamber A2, a part of the fourth chamber A4, a part of the first communication hole B1, a part of the second communication hole B2, a part of the first communication path C1, a part of the second communication path C2, the second valve seat 54, the fourth valve seat 56, a part of the air supply passage 75, a part of the exhaust passage 76, a part of the first air supply and exhaust passage 77, a part of the second air supply and exhaust passage 78, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the third manifold member 63A.

[0050] In the first manifold 50A, the first communication path C1 and the second communication path C2 are constituted by a recess formed in the boundary surface between the second manifold member 62A and the third manifold member 63A. Specifically, the first communication path C1 and the second communication path C2 are constituted by a space surrounded by a plane formed on the lower surface (boundary surface) of the second manifold member 62A and a recess formed on the upper surface (boundary surface) of the third manifold member 63A. In addition, the first communication path C1 and the second communication path C2 may also be constituted by a space surrounded by a recess formed on the lower surface (boundary surface) of the second manifold member 62A and a plane formed on the upper surface (boundary surface) of the third manifold member 63A, or may be constituted by a space surrounded by a recess formed on the lower surface (boundary surface) of the second manifold member 62A and a recess formed on the upper surface (boundary surface) of the third manifold member 63A. In addition, the "boundary surface" between the adjacent manifold members 60 mentioned here includes the butting surface where the manifold members 60 are in contact with each other and the imaginary surface obtained by extending the butting surface to the part (space) where the recess exists.

[0051] In other words, in the first manifold 50A, the first communication path C1 and the second communication path C2 are formed in a range including the boundary surface between adjacent manifold members 60 (the second manifold member 62A and the third manifold member 63A). In addition, in the present embodiment, a case where both the first communication path C1 and the second communication path C2 are formed in a range including the boundary surface between adjacent manifold members 60 is illustrated. However, the first manifold 50A of the present disclosure may be configured such that either the first communication path C1 or the second communication path C2 penetrates into the interior of the manifold member 60.

[0052] For example, in the case where the manifold is configured by a single metal block (block) as in the past, paths such as the first communication path C1 and the second communication path C2 are formed in the block by using a drill or the like. Since the cross-sectional shape of the path formed by a drill or the like is entirely circular, the blank portion other than the path is necessarily large. As a result, the block becomes large and the weight also increases. On the other hand, in the case where the manifold 50 of the present disclosure is configured by laminating plate-like manifold members 60 in the plate thickness direction, paths such as the first communication path C1 and the second communication path C2 can be formed by depressions provided in a range including the boundary surface between adjacent manifold members 60. In the manifold 50 of the present disclosure, a path extending in a direction orthogonal to the lamination direction of the manifold members 60 can be expanded in the front-rear direction and the left-right direction, and the degree of freedom of the cross-sectional shape of such a path is higher than in the past. In the manifold 50 having the above structure, the blank portion other than the path can be suppressed, and as a result, the manifold can be made small and lightweight.

[0053] As Figure 1 and Figure 6A 、 6B shown, a part of the second chamber A2, a part of the fourth chamber A4, the air supply port 71, a part of the air supply passage 75, the exhaust port 72, a part of the exhaust passage 76, the first air supply and exhaust port 73, a part of the first air supply and exhaust passage 77, the second air supply and exhaust port 74, and a part of the second air supply and exhaust passage 78 are formed in the fourth manifold member 64A.

[0054] In the first manifold 50A, the second chamber A2 and the fourth chamber A4 are formed across two manifold members 60 and are constituted by the third manifold member 63A and the fourth manifold member 64A.

[0055] In the first manifold 50A, the first communication hole B1 and the second communication hole B2 are formed such that their axial directions are parallel to the lamination direction of each manifold member 60. In the first manifold 50A, the first communication hole B1 and the second communication hole B2 are formed across two manifold members 60 (the second manifold member 62A and the third manifold member 63A).

[0056] [Regarding the operation of the three-way valve] FIG. 7 is an explanatory diagram of the operation of the three-way valve of the present disclosure. As shown in FIG. 7, the three-way valve 10 of the present disclosure is used in such a manner that compressed air is supplied to the air supply port 71 and gas is sucked and exhausted from the exhaust port 72. The three-way valve 10 having the above structure is applicable to a VPSA (Vacuum Pressure Swing Adsorption system) type oxygen concentrator including a pair of adsorption cylinders and performing decompression by sucking the other adsorption cylinder during supplying compressed air to one adsorption cylinder. In addition, the three-way valve 10 shown in the present embodiment exemplifies the case of sucking and exhausting from the exhaust port 72, but the three-way valve 10 of the present disclosure may also be configured to exhaust from the exhaust port 72 by releasing to the atmosphere without sucking the exhaust port 72. The three-way valve 10 in this case is applicable to a PSA (Pressure Swing Adsorption system) type oxygen concentrator including a pair of adsorption cylinders and performing decompression by releasing the other adsorption cylinder to the atmosphere during supplying compressed air to one adsorption cylinder.

[0057] The three-way valve 10 is switched in the first mode so that the "1" port and the "2" port of the first pilot valve 31 communicate with each other, and is switched so that the "1" port and the "3" port of the second pilot valve 32 communicate with each other.

[0058] At this time, in the first control valve 21, the pilot chamber A1a communicates with the air supply passage 75 via the first pilot passage 91, the first pilot valve 31, the third pilot passage 93, and the first communication passage C1. Thereby, compressed air is supplied to the pilot chamber A1a (a positive pilot pressure is applied).

[0059] When compressed air is supplied to the pilot chamber A1a in the first control valve 21, a pilot pressure is applied to the first diaphragm 23b, whereby the first connecting rod 23a is displaced toward the side from the first chamber A1 to the second chamber A2. At this time, the first valve portion 23d is pressed against the first valve seat 53, and the flow of air from the first communication hole B1 to the first chamber A1 (the portion below the first diaphragm 23b) is sealed. In this description, the position of the first valve element 23 at this time is referred to as the first position P1.

[0060] In addition, at this time, the second valve portion 23e of the first control valve 21 is separated from the second valve seat 54, whereby the first communication passage C1 communicates with the first air supply and exhaust passage 77 via the first communication hole B1 and the second chamber A2. Thereby, air is supplied from the air supply passage 75 to the first air supply and exhaust passage 77 via the first control valve 21.

[0061] At this time, in the second control valve 22, the pilot chamber A3a communicates with the exhaust passage 76 via the second pilot passage 92, the second pilot valve 32, the fourth pilot passage 94, and the second communication passage C2. Thereby, exhaust is sucked from the pilot chamber A3a (a negative pilot pressure is applied).

[0062] When the second control valve 22 performs suction exhaust from the pilot chamber A3a, a negative pilot pressure is applied to the third diaphragm 24b, whereby the second link 24a is displaced toward the side from the fourth chamber A4 toward the third chamber A3. At this time, the fourth valve portion 24e is pressed against the fourth valve seat 56, and the flow of air from the fourth chamber A4 to the second communication hole B2 is sealed.

[0063] In addition, at this time, the third valve portion 24d of the second control valve 22 is separated from the third valve seat 55, whereby the second communication path C2 communicates with the second supply and exhaust path 78 via the second communication hole B2 and the third chamber A3 (the portion below the third diaphragm 24b). Thereby, the gas is exhausted from the exhaust path 76 to the second supply and exhaust path 78 via the second control valve 22. In this description, the position of the second valve element 24 at this time is referred to as the second position P2.

[0064] In addition, in the second control valve 22, the pilot chamber A3a communicates with the exhaust path 76 via the second pilot path 92, the second pilot valve 32, the fourth pilot path 94, and the second communication path C2. In the second control valve 22, by performing suction exhaust from the pilot chamber A3a, a negative pilot pressure is applied to the second valve element 24 (the third diaphragm 24b).

[0065] When the second control valve 22 performs suction exhaust from the pilot chamber A3a, a negative pilot pressure is applied to the third diaphragm 24b, whereby the second valve element 24 (the second link 24a) reliably displaces from the first position P1 to the second position P2. Therefore, the second control valve 22 can ensure the reliability of operation.

[0066] As described above, the three-way valve 10 of the present disclosure switches the flow of the fluid in the first mode to allow the supply flow from the supply port 71 to the first supply and exhaust port 73 to discharge the gas from the first supply and exhaust port 73, and allows the exhaust flow from the second supply and exhaust port 74 to the exhaust port 72 to suck the gas from the second supply and exhaust port 74.

[0067] The three-way valve 10 of the present disclosure is switched in the second mode so that the "1" port and the "3" port of the first pilot valve 31 communicate with each other, and is switched so that the "1" port and the "2" port of the second pilot valve 32 communicate with each other.

[0068] At this time, in the first control valve 21, the pilot chamber A1a communicates with the exhaust path 76 via the first pilot path 91, the first pilot valve 31, the fourth pilot path 94, and the second communication path C2. Thereby, suction exhaust is performed from the pilot chamber A1a (a negative pilot pressure is applied).

[0069] When the first control valve 21 sucks and exhausts from the pilot chamber A1a of the first chamber A1, a negative pilot pressure is applied to the first diaphragm 23b. As a result, the first connecting rod 23a is displaced in the Z direction toward the side of the first chamber A1 from the second chamber A2. At this time, the second valve portion 23e is pressed against the second valve seat 54, and the flow of air from the second chamber A2 to the first communication hole B1 is sealed.

[0070] In addition, at this time, the first valve portion 23d of the second control valve 21 is separated from the first valve seat 53. As a result, the second communication path C2 communicates with the first air supply and exhaust path 77 via the first communication hole B1 and the first chamber A1 (the portion below the first diaphragm 23b). Thus, the gas is exhausted from the exhaust path 76 to the first air supply and exhaust path 77 via the first control valve 21. In this description, the position of the first valve element 23 at this time is referred to as the second position P2.

[0071] In addition, in the first control valve 21, the pilot chamber A1a communicates with the exhaust path 76 via the first pilot path 91, the first pilot valve 31, the fourth pilot path 94, and the second communication path C2. In the first control valve 21, by sucking and exhausting from the pilot chamber A1a, a negative pilot pressure is applied to the first valve element 23 (the first diaphragm 23b).

[0072] When the first control valve 21 sucks and exhausts from the pilot chamber A1a, a negative pilot pressure is applied to the first diaphragm 23b. As a result, the first valve element 23 (the first connecting rod 23a) is reliably displaced from the first position P1 to the second position P2. Therefore, the first control valve 21 can ensure the reliability of the operation.

[0073] At this time, in the second control valve 22, the pilot chamber A3a communicates with the air supply path 75 via the second pilot path 92, the second pilot valve 32, the third pilot path 93, and the first communication path C1. Thus, compressed air is supplied to the pilot chamber A3a (a positive pilot pressure is applied).

[0074] When compressed air is supplied to the pilot chamber A3a in the second control valve 22, a positive pilot pressure is applied to the third diaphragm 24b. As a result, the second connecting rod 24a is displaced in the Z direction toward the side of the fourth chamber A4 from the third chamber A3. At this time, the third valve portion 24d is pressed against the third valve seat 55, and the flow of air from the third chamber A3 (the portion below the third diaphragm 24b) to the second communication hole B2 is sealed. In this description, the position of the second valve element 24 at this time is referred to as the first position P1.

[0075] In addition, at this time, the fourth valve portion 24e of the second control valve 22 is separated from the fourth valve seat 56. As a result, the first communication path C1 and the second supply / discharge passage 78 communicate with each other via the second communication hole B2 and the fourth chamber A4. Thus, air is supplied from the supply passage 75 to the second supply / discharge passage 78 via the second control valve 22.

[0076] In this way, the three-way valve 10 of the present disclosure switches the flow of the fluid in the second mode to allow the supply flow from the supply port 71 to the second supply / discharge port 74 to discharge the gas from the second supply / discharge port 74, and allows the exhaust flow from the first supply / discharge port 73 to the exhaust port 72 to suck the gas from the first supply / discharge port 73.

[0077] By alternately switching the first mode and the second mode, the three-way valve 10 of the present disclosure can alternately use the first supply / discharge port 73 as a supply port and an exhaust port, and alternately use the second supply / discharge port 74 as a port on the side different from the first supply / discharge port among the supply port and the exhaust port.

[0078] [Regarding the three-way valve of the second embodiment] Figure 8 It is a cross-sectional schematic view showing the three-way valve (second embodiment) of the present disclosure. Figure 9 It is a perspective schematic view showing the three-way valve (second embodiment) of the present disclosure. Figure 8 and Figure 9 The second three-way valve 10B of the three-way valve 10 of the second embodiment of the present disclosure is shown in. As Figure 8 and Figure 9 shown, in the second three-way valve 10B, the manifold 50 is composed of five plate-shaped manifold members 60, which is different from the above-described first three-way valve 10A in this regard. In addition, in the following description, the manifold 50 of the second three-way valve 10B will also be referred to as the second manifold 50B.

[0079] [Regarding the manifold of the three-way valve of the second embodiment] Figure 10A It is a top view showing the first manifold member of the second three-way valve. Figure 10B It is a bottom view showing the first manifold member of the second three-way valve. Figure 10C It is a rear view showing the first manifold member of the second three-way valve. Figure 11A It is a top view showing the second manifold member of the second three-way valve. Figure 11B It is a bottom view showing the second manifold member of the second three-way valve. Figure 12A It is a top view showing the third manifold member of the second three-way valve. Figure 12B It is a bottom view showing the third manifold member of the second three-way valve. Figure 13AIt is a top view of the fourth manifold member representing the second three-way valve. Figure 13B It is a bottom view of the fourth manifold member representing the second three-way valve. Figure 14A It is a top view of the fifth manifold member representing the second three-way valve. Figure 14B It is a bottom view of the fifth manifold member representing the second three-way valve. As Figure 8 and Figure 9 shown, the second manifold 50B is composed of a first manifold member 60 (hereinafter referred to as the first manifold member 61B), a second manifold member 60 (hereinafter referred to as the second manifold member 62B), a third manifold member 60 (hereinafter referred to as the third manifold member 63B), a fourth manifold member 60 (hereinafter referred to as the fourth manifold member 64B), and a fifth manifold member 60 (hereinafter referred to as the fifth manifold member 65).

[0080] The second manifold 50B is formed by stacking in the plate thickness direction in the order of the first manifold member 61B, the second manifold member 62B, the third manifold member 63B, the fourth manifold member 64B, and the fifth manifold member 65, starting from the upper side in the axial direction (Z direction) of the first connecting rod 23a housed in the first valve chamber 51 and the second connecting rod 24a housed in the second valve chamber 52.

[0081] As Figure 8 and Figure 10A , 10B shown, a part of the first chamber A1, a part of the third chamber A3, the first pilot port 81, the second pilot port 82, the third pilot port 83, the fourth pilot port 84, the fifth pilot port 85, the sixth pilot port 86, the first pilot passage 91, the second pilot passage 92, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the first manifold member 61B.

[0082] As Figure 8 and Figure 11A , 11B shown, a part of the first chamber A1, a part of the third chamber A3, a part of the first communication hole B1, a part of the second communication hole B2, a part of the second communication path C2, the first valve seat 53, the third valve seat 55, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the second manifold member 62B.

[0083] In the second manifold 50B, the first chamber A1 and the third chamber A3 are formed across two manifold members 60 and are composed of the first manifold member 61B and the second manifold member 62B.

[0084] As Figure 8 and Figure 12A , 12BAs shown, a part of the first communication hole B1, a part of the second communication hole B2, a part of the first communication path C1, a part of the second communication path C2, a part of the exhaust passage 76, a part of the first air supply / exhaust passage 77, a part of the second air supply / exhaust passage 78, a part of the third pilot passage 93, and a part of the fourth pilot passage 94 are formed in the third manifold member 63B.

[0085] In the second manifold 50B, the second communication path C2 is formed by a recess in a range including the boundary surface between the second manifold member 62B and the third manifold member 63B. Specifically, the second communication path C2 is constituted by a space surrounded by the lower surface (flat surface) of the second manifold member 62B and a recess formed in the upper surface of the third manifold member 63B. In addition, the second communication path C2 may also be constituted by a space surrounded by a recess formed in the lower surface of the second manifold member 62B and the upper surface (flat surface) of the third manifold member 63B, or may be constituted by a space surrounded by a recess formed in the lower surface of the second manifold member 62B and a recess formed in the upper surface of the third manifold member 63B.

[0086] In other words, in the second manifold 50B, the second communication path C2 is formed in a range including the boundary surface between adjacent manifold members 60 (the second manifold member 62B and the third manifold member 63B).

[0087] As Figure 8 and Figure 13A 、 13B As shown, a part of the second chamber A2, a part of the fourth chamber A4, a part of the first communication hole B1, a part of the second communication hole B2, a part of the first communication path C1, the second valve seat 54, the fourth valve seat 56, a part of the air supply passage 75, a part of the exhaust passage 76, a part of the first air supply / exhaust passage 77, and a part of the second air supply / exhaust passage 78 are formed in the fourth manifold member 64B.

[0088] In the second manifold 50B, the first communication path C1 is formed by a recess in a range including the boundary surface between the third manifold member 63B and the fourth manifold member 64B. Specifically, the first communication path C1 is constituted by a space surrounded by the lower surface (flat surface) of the third manifold member 63B and a recess formed in the upper surface of the fourth manifold member 64B. In addition, the first communication path C1 may also be constituted by a space surrounded by a recess formed in the lower surface of the third manifold member 63B and the upper surface (flat surface) of the fourth manifold member 64B, or may be constituted by a space surrounded by a recess formed in the lower surface of the third manifold member 63B and a recess formed in the upper surface of the fourth manifold member 64B.

[0089] In other words, in the second manifold 50B, the first communication path C1 is formed in a range including the boundary surface between adjacent manifold members 60 (the third manifold member 63B and the fourth manifold member 64B). Further, in the present embodiment, an example is shown in which both the first communication path C1 and the second communication path C2 are formed in a range including the boundary surface between adjacent manifold members 60. However, the second manifold 50B of the present disclosure may also be configured such that either the first communication path C1 or the second communication path C2 penetrates into the interior of the manifold member 60.

[0090] As Figure 8 and Figure 14A , 14B shown, a part of the second chamber A2, a part of the fourth chamber A4, the air supply port 71, a part of the air supply passage 75, the exhaust port 72, a part of the exhaust passage 76, the first air supply / exhaust port 73, a part of the first air supply / exhaust passage 77, the second air supply / exhaust port 74, and a part of the second air supply / exhaust passage 78 are formed in the fifth manifold member 65.

[0091] In the second manifold 50B, the second chamber A2 and the fourth chamber A4 are formed across two manifold members 60 and are constituted by the fourth manifold member 64B and the fifth manifold member 65.

[0092] In the second manifold 50B, the first communication hole B1 and the second communication hole B2 are formed such that their axial directions are parallel to the stacking direction of the respective manifold members 60. In the second manifold 50B, the first communication hole B1 and the second communication hole B2 are formed across three manifold members 60 (the second manifold member 62B, the third manifold member 63B, and the fourth manifold member 64B).

[0093] For example, in the case of the first manifold 50A having a four-layer structure, where two systems of passages (the first communication path C1 and the second communication path C2) extending in a direction orthogonal to the stacking direction are provided on one third manifold member 63A, the expansion of each passage in the front-rear direction is restricted. As a result, it may be difficult to ensure the cross-sectional area of each passage. On the other hand, in the case of the second manifold 50B having a five-layer structure, where one system of passage extending in a direction orthogonal to the stacking direction is provided on each of the third manifold member 63B and the fourth manifold member 64B, the restriction on the expansion of each passage in the front-rear direction is alleviated. As a result, it becomes easier to ensure the cross-sectional area of each passage (the first communication path C1 and the second communication path C2).

[0094] [Regarding the oxygen concentrator of the present disclosure] Figure 15 is an explanatory diagram of an oxygen concentrator according to an embodiment of the present disclosure. Figure 16It is a block diagram for explaining the oxygen concentration process of an oxygen concentrator. Additionally, in Figure 16 for ease of understanding, the representation of part of the structure and elements shown in Figure 15 is simplified or the illustration is omitted. The oxygen concentrator of the present disclosure is a device that generates high-concentration oxygen containing an oxygen concentration higher than that in air and supplies it to a user. The oxygen concentrator is used, for example, in home oxygen therapy, in which high-concentration oxygen is provided to a user such as a patient with a respiratory disease.

[0095] [Structure of Oxygen Concentrator M] As shown in Figure 15 and Figure 16 , the oxygen concentrator M includes: a first adsorption cylinder 101 and a second adsorption cylinder 102; a compressor 103 that supplies pressurized air to the first adsorption cylinder 101 and the second adsorption cylinder 102; and an oxygen container 105 that stores high-concentration oxygen. The compressor 103 of the present embodiment is a pressure and vacuum dual-use type compressor capable of pressurizing and sucking gases such as air. The compressor 103 supplies pressurized air to the first adsorption cylinder 101 and the second adsorption cylinder 102, and desorbs and exhausts the adsorbed nitrogen-rich gas by decompression. Additionally, in the present embodiment, a pressure and vacuum dual-use type compressor 103 is used, but the oxygen concentrator of the present disclosure may also be configured to have a vacuum pump as a suction part in addition to the compressor that supplies pressurized air within the device.

[0096] The operation of the compressor 103 and the operation of various solenoid valves and the like described later are performed by a control unit 140 disposed within the device. The control unit 140 includes a storage unit 140a that stores a program for operating the oxygen concentrator M and an arithmetic unit 140b that issues operation signals for solenoid valves and the like. A battery 141 that serves as a power supply source in a state where it is not connected to a power source and a display unit 142 that displays the operation state of the oxygen concentrator M are connected to the control unit 140.

[0097] Within the housing 109, there are provided: a compressor box 110 that houses the compressor 103 and an exhaust muffler 114; and a fan box 130 that houses a cooling fan 112 for cooling the compressor 103, a supply air filter 116, and a supply air muffler box 113. The compressor box 110, the supply air muffler box 113, and the fan box 130 constitute a noise reduction mechanism of the oxygen concentrator M. In other words, the compressor box 110, the supply air muffler box 113, and the fan box 130 can reduce the noise generated by each device disposed within the housing 109.

[0098] A switching valve 111 is also provided inside the housing 109. The switching valve 111 switches the flow of pressurized air from the compressor 103 to the first adsorption cylinder 101 and the second adsorption cylinder 102, and the flow of exhaust gas from the first adsorption cylinder 101 and the second adsorption cylinder 102 to the compressor 103. The switching valve 111 in the present embodiment is composed of a first control valve 111A which is a three-port valve and a second control valve 111B which is also a three-port valve.

[0099] The oxygen concentrator M of the present disclosure uses the above-mentioned three-way valve 10 as the switching valve 111. The first control valve 111A corresponds to the above-mentioned first control valve 21, and the second control valve 111B corresponds to the above-mentioned second control valve 22. In addition, in Figure 16 , numbers such as "1", "2", or "3" marked near the mark indicating the valve represent the port numbers of the valve. Numbers from "1" to "3" are marked on the three-port valve, and numbers "1" and "2" are marked on the two-port valve. Figure 15 The port "A" shown in the switching valve 111 corresponds to the air supply port 71, the port "B" corresponds to the exhaust port 72, the port "C" corresponds to the first air supply and exhaust port 73, and the port "D" corresponds to the second air supply and exhaust port 74.

[0100] A dust filter 115 is provided at the air supply port 108 provided in the housing 109. The dust filter 115 is used to capture dust and the like contained in the external air introduced into the device. The external air introduced into the housing 109 through the dust filter 115 is sucked into the air supply filter 116 through the opening 131 of the fan box 130, and is sucked into the compressor 103 through the air supply muffler 113. The air supply muffler 113 is disposed on the air flow path from the air supply filter 116 to the compressor 103 to reduce the noise caused by the air supply and compression of the compressor 103.

[0101] The air (pressurized air) pressurized by the compressor 103 is supplied to the first adsorption cylinder 101 and the second adsorption cylinder 102 via the first control valve 111A and the second control valve 111B. In addition, the exhaust gas from the first adsorption cylinder 101 and the second adsorption cylinder 102 is decompressed and sucked by the compressor 103 via the first control valve 111A and the second control valve 111B, and is discharged to the outside from the exhaust muffler 114 through the opening 117 of the compressor box 110 from the exhaust port 170. The heat of the compressor 103 generated by operation is attracted into the fan box 130 through the air supply port 180 of the housing 109 and the opening 131 of the fan box 130 by the cooling fan 112, and is cooled by the air blown to the compressor 103 by the cooling fan 112.

[0102] An adsorbent is stored inside the first adsorption cylinder 101 and the second adsorption cylinder 102, and the adsorbent selectively, and further preferably, adsorbs nitrogen in the pressurized air supplied from the compressor 103. As the adsorbent, zeolite or the like can be used, for example. The process of oxygen concentration using the first adsorption cylinder 101 and the second adsorption cylinder 102 will be described in detail later.

[0103] In the flow path on the downstream side of the first adsorption cylinder 101 and the second adsorption cylinder 102 (the flow path on the outlet side of high-concentration oxygen, which is the flow path from the lower parts of the first adsorption cylinder 101 and the second adsorption cylinder 102 to the first oxygen outlet 150 in Figure 15 ), various valves for controlling the flow rate or flow of fluids such as high-concentration oxygen are provided, namely, a bleed valve 118, check valves 119, 120, and a tuning valve 122. A micro-pressure sensor 128 for detecting the user's breathing is attached to the tuning valve 122. The tuning valve 122 switches to the "open" state or the "closed" state according to the detection result of the micro-pressure sensor 128. The oxygen container 105 is provided on the upstream side of the tuning valve 122 and on the downstream side of the check valves 119, 120. In addition, a pressure sensor 123 for detecting abnormal pressure or the like is provided in the gas flow path between the check valves 119, 120 and the oxygen container 105.

[0104] The oxygen concentration device M of the present embodiment is a VPSA (Vacuum Pressure Swing Adsorption System) type oxygen concentration device that evacuates the other adsorption cylinder by suction with the compressor 103 while supplying the air compressed by the compressor 103 to one adsorption cylinder. However, the oxygen concentration device of the present disclosure is not limited to this, and it can also be a PSA (Pressure Swing Adsorption System) type oxygen concentration device in which the other adsorption cylinder is released to the atmosphere for evacuation while supplying the air compressed by the compressor to one adsorption cylinder.

[0105] Both the first control valve 111A and the second control valve 111B are three-port valves, which switch between the pressurized state of supplying the pressurized air discharged from the compressor 103 to the first adsorption cylinder 101 (the second adsorption cylinder 102) and the decompressed state of discharging the waste gas inside the first adsorption cylinder 101 (the second adsorption cylinder 102) to the outside by suction. When one adsorption cylinder is in the pressurized state, the other adsorption cylinder is in the decompressed state.

[0106] The check valve 119 is arranged in the gas flow path on the downstream side of the first adsorption cylinder 101, and the check valve 120 is arranged in the gas flow path on the downstream side of the second adsorption cylinder 102. The two check valves 119 and 120 are configured to allow the high-concentration oxygen discharged from the first adsorption cylinder 101 and the second adsorption cylinder 102 to flow only toward the downstream side. The bleed valve 118 is arranged in the gas flow path connecting the gas flow path between the first adsorption cylinder 101 and the check valve 119 and the gas flow path between the second adsorption cylinder 102 and the check valve 120.

[0107] The high-concentration oxygen from the check valve 119 and the high-concentration oxygen from the check valve 120 are alternately supplied to the oxygen container 105 and stored in the oxygen container 105. A bacteria filter 125 for removing foreign substances from the high-concentration oxygen and a tuning valve 122 for adjusting the flow rate of the high-concentration oxygen from the oxygen container 105 are arranged on the downstream side of the oxygen container 105. The high-concentration oxygen with the flow rate adjusted by the tuning valve 122 is transported to the oxygen outlet 150 of the housing 109 via an oxygen sensor 124 for detecting abnormal oxygen concentration. In the oxygen concentrator M, the high-concentration oxygen is supplied to the patient via a ferrule joint 126 provided at the oxygen outlet 150, a pipe TA, and a sleeve Ca connected to the ferrule joint 126 (refer to Figure 16 ).

[0108] [Oxygen Concentration Process] Figure 17 This is a diagram showing the relationship between the pressure change in one cycle of the adsorption cylinder and the switching state of the control valves of the oxygen concentrator. Here, the generation process of the high-concentration oxygen in the oxygen concentrator M will be described.

[0109] Figure 17 In, the upper diagram shows the opening and closing states in each step of the first control valve 111A, the second control valve 111B, and the bleed valve 118 related to the oxygen concentration process (refer to Figure 16 ), and the lower diagram shows the pressure changes inside the first adsorption cylinder 101 and the second adsorption cylinder 102 (refer to Figure 16 ). In the lower diagram, the thick solid line shows the pressure change inside the first adsorption cylinder 101, and the thin solid line shows the pressure change inside the second adsorption cylinder 102. In Figure 17 the example shown, the pressurization process inside the adsorption cylinder is carried out in the order of the first adsorption cylinder 101 and the second adsorption cylinder 102. In addition, in Figure 17 , the processing of one cycle of the first adsorption cylinder 101 is carried out during the period indicated by "T". The processing of this one cycle includes six steps from "T1" to "T6" shown in the upper diagram.

[0110] In Figure 16In FIG. 1 , the numbers marked in the boxes representing the first control valve 111A, the second control valve 111B, and the purge valve 118 represent the numbers of the ports in each valve as described above. The first control valve 111A and the second control valve 111B are three-port valves, and therefore, three numbers from 1 to 3 are marked, and the purge valve 118 is a two-port valve, and therefore, two numbers from 1 to 2 are marked. Figure 17 In the figure on the upper side of , for example, "1→2" of the first control valve 111A is "open", which means that in the first control valve 111A, the port represented by "1" and the port represented by "2" are in a connected state. At this time, in the first control valve 111A, the port represented by "2" and the port represented by "3" are in a non-connected state.

[0111] exist Figure 17 In the figure on the lower side, the horizontal axis represents the passage of time, and in the same figure, time passes from the left to the right. In step T1, the purge valve 118 is in the "open" state, and the high-concentration oxygen in the second adsorption cylinder 102 is supplied from the second adsorption cylinder 102 to the first adsorption cylinder 101. In this step T1, since the ports "2" to "3" of the first control valve 111A and the second control valve 111B are in the "closed" state, the first adsorption cylinder 101 and the second adsorption cylinder 102 will not be sucked. The suction of the first adsorption cylinder 101 and the second adsorption cylinder 102 is performed at staggered times by controlling the opening and closing of the valves.

[0112] Next, in step T2, the ports "1" to "2" of the first control valve 111A and the ports "2" to "3" of the second control valve 111B are in the "open" state, and the first adsorption cylinder 101 is pressurized and the second adsorption cylinder 102 is depressurized by the compressor 103. In this step T2, the purge valve 118, which was originally in the "open" state in step T1, is in the "closed" state. In the first adsorption cylinder 101 that is in a pressurized state due to the supply of pressurized air, the nitrogen contained in the pressurized air is adsorbed by the adsorbent contained in the first adsorption cylinder 101. As a result, the gas in the first adsorption cylinder 101 becomes a high-concentration oxygen having an oxygen concentration higher than that in normal air.

[0113] Next, in step T3 , the purge valve 118 is in the “open” state, and the high-concentration oxygen in the first adsorption column 101 is supplied to the second adsorption column 102 via the purge valve 118 .

[0114] Next, in step T4, ports 2 to 3 of the first control valve 111A and ports 2 to 3 of the second control valve 111B are closed. In step T4, the supply of high-concentration oxygen from the first adsorption column 101 to the second adsorption column 102 in step T3 is continued.

[0115] Next, in step T5, the port "2" to port "3" of the first control valve 111A and the port "1" to port "2" of the second control valve 111B are in the "open" state, and the second adsorption cylinder 102 is pressurized and the first adsorption cylinder 101 is depressurized by the compressor 103. In this step T4, the exhaust valve 118, which was in the "open" state in step T3, is in the "closed" state. In the second adsorption cylinder 102 that is supplied with pressurized air and is in a pressurized state, the nitrogen contained in the pressurized air is adsorbed by the adsorbent in the second adsorption cylinder 102. As a result, the gas in the second adsorption cylinder 102 becomes high-concentration oxygen with an oxygen concentration higher than that in normal air.

[0116] Next, in step T6, the exhaust valve 118 is in the "open" state, and the high-concentration oxygen in the second adsorption cylinder 102 is supplied into the first adsorption cylinder 101 via the exhaust valve 118. Then, the above steps T1 to T6 are repeated. The oxygen concentrator M generates high-concentration oxygen by repeatedly performing the above steps T1 to T6 in the first adsorption cylinder 101 and the second adsorption cylinder 102, and stores the generated high-concentration oxygen in the oxygen container 105.

[0117] [Function and Effect of the Embodiment] (1) The three-way valve 10 of the above embodiment includes a manifold 50, valve cores 23, 24, and a pilot mechanism 30. Among them, a flow path is formed in the manifold 50. The flow path includes: a gas supply port 71; a gas supply passage 75 connected to the gas supply port 71; an exhaust port 72; an exhaust passage 76 connected to the exhaust port 72; gas supply and exhaust ports 73, 74; gas supply and exhaust passages 77, 78 connected to the gas supply and exhaust ports 73, 74; and valve chambers 51, 52 communicating with the gas supply passage 75, the exhaust passage 76, and the gas supply and exhaust passages 77, 78. The valve cores 23, 24 are housed in the valve chambers 51, 52 and can be displaced to a first position where the gas supply port 71 communicates with the gas supply and exhaust passage 77, 78 or a second position where the exhaust port 72 communicates with the gas supply and exhaust passage 77, 78. The pilot mechanism 30 switches the positions of the valve cores 23, 24 to the first position or the second position. In the three-way valve 10, the manifold 50 is formed by laminating a plurality of plate-like manifold members 60 in the plate thickness direction.

[0118] According to this three-way valve 10, by adopting the manifold 50 having a laminated structure, it is possible to make the cross-sectional shape of the passages constituting each flow path in the manifold 50 a shape other than a circle, and it is possible to improve the space efficiency in the manifold 50 (the ratio of the space to be ensured in the manifold 50 to the volume of the manifold 50). Thereby, it is possible to achieve miniaturization and weight reduction of the three-way valve 10.

[0119] (2) In the three-way valve 10 of the above-described embodiment, the flow paths formed in the manifold 50 include: a first valve chamber 51; a second valve chamber 52; a first communication path C1 that communicates the first valve chamber 51 with the second valve chamber 52 and is connected to the air supply passage 75; a second communication path C2 that communicates the first valve chamber 51 with the second valve chamber 52 and is connected to the exhaust passage 76; a first air supply / discharge port 73 on the first valve chamber 51 side; a first air supply / discharge passage 77 on the first valve chamber 51 side; a second air supply / discharge port 74 on the second valve chamber 52 side; and a second air supply / discharge passage 78 on the second valve chamber 52 side. The valve element of the three-way valve 10 includes a first valve element 23 and a second valve element 24. The first valve element 23 is housed in the first valve chamber 51, and the second valve element 24 is housed in the second valve chamber 52.

[0120] The three-way valve 10 can be miniaturized and lightened when it is a double three-way valve.

[0121] (3) In the three-way valve 10 of the above-described embodiment, the first communication path C1 and the second communication path C2 are formed by depressions on the boundary surfaces of adjacent manifold members 60.

[0122] In the three-way valve 10 in which the manifold 50 has a laminated structure, the first communication path C1 and the second communication path C2 can be formed in the boundary portion of the manifold member 60. Thereby, the space efficiency inside the manifold 50 can be improved, and the manifold 50 can be miniaturized.

[0123] (4) In the three-way valve 10 of the above-described embodiment, the flow paths formed in the manifold 50 further include: a first pilot passage 91 that communicates the air supply passage 75 or the exhaust passage 76 with the first valve chamber 51; and a second pilot passage 92 that communicates the air supply passage 75 or the exhaust passage 76 with the second valve chamber 52. The first valve element 23 has a first diaphragm 23b and a second diaphragm 23c that can be deformed by the pressure of the fluid supplied to the first valve chamber 51 via the first pilot passage 91. The second valve element 24 has a third diaphragm 24b and a fourth diaphragm 24c that can be deformed by the pressure of the fluid supplied to the second valve chamber 52 via the second pilot passage 92. The pilot mechanism 30 is composed of a first pilot valve 31 and a second pilot valve 32. The pilot mechanism 30 switches the fluid supply target to either the first pilot passage 91 or the second pilot passage 92 through the first pilot valve 31 and the second pilot valve 32, so that either the first valve element 23 or the second valve element 24 is located at the first position P1 by the deformation of the first diaphragm 23b and the second diaphragm 23c or the third diaphragm 24b and the fourth diaphragm 24c, and the other of the first valve element 23 and the second valve element 24 is located at the second position P2.

[0124] The three-way valve 10 can be miniaturized and lightened when it is a pilot-operated three-way valve that operates by pilot pressure.

[0125] (5) The flow path formed in the manifold 50 in the three-way valve 10 of the above-described embodiment further includes a fourth pilot passage 94 that connects the first pilot passage 91 or the second pilot passage 92 to the exhaust passage 76. In the three-way valve 10, the first pilot valve 31 and the second pilot valve 32 switch the connection target of the fourth pilot passage 94 to either the first pilot passage 91 or the second pilot passage 92, thereby deforming the first diaphragm 23b or the third diaphragm 24b.

[0126] According to this three-way valve 10, it is possible to improve the reliability of the displacement operation of the first valve element 23 and the second valve element 24 when sucking and exhausting from the exhaust port 72.

[0127] (6) In the three-way valve 10 of the above-described embodiment, the first valve element 23 includes a first connecting rod 23a, a first diaphragm 23b connected to one end of the first connecting rod 23a, a second diaphragm 23c connected to the other end of the first connecting rod 23a, a first valve portion 23d provided on the first diaphragm 23b side of the first connecting rod 23a, and a second valve portion 23e provided on the second diaphragm 23c side of the first connecting rod 23a. The second valve element 24 includes a second connecting rod 24a, a third diaphragm 24b connected to one end of the second connecting rod 24a, a fourth diaphragm 24c connected to the other end of the second connecting rod 24a, a third valve portion 24d provided on the third diaphragm 24b side of the second connecting rod 24a, and a fourth valve portion 24e provided on the fourth diaphragm 24c side of the second connecting rod 24a. The first valve chamber 51 has: a first chamber A1 that houses the first diaphragm 23b; a second chamber A2 that houses the second diaphragm 23c; a first communication hole B1 that connects the first chamber A1 and the second chamber A2 and houses the first connecting rod 23a; a first valve seat 53 formed at the end of the first communication hole B1 on the first chamber A1 side and facing the first valve portion 23d; and a second valve seat 54 formed at the end of the first communication hole B1 on the second chamber A2 side and facing the second valve portion 23e. The second valve chamber 52 has: a third chamber A3 that houses the third diaphragm 24b; a fourth chamber A4 that houses the fourth diaphragm 24c; a second communication hole B2 that connects the third chamber A3 and the fourth chamber A4 and houses the second connecting rod 24a; a third valve seat 55 formed at the end of the second communication hole B2 on the third chamber A3 side and facing the third valve portion 24d; and a fourth valve seat 56 formed at the end of the second communication hole B2 on the fourth chamber A4 side and facing the fourth valve portion 24e. The first communication path C1 connects the second chamber A2 and the fourth chamber A4, the second communication path C2 connects the first chamber A1 and the third chamber A3, the third pilot passage 93 is connected to the air supply passage 75 via the first communication path C1, and the fourth pilot passage 94 is connected to the exhaust passage 76 via the second communication path C2.

[0128] This three-way valve 10 can achieve miniaturization and weight reduction in the case of an internally piloted double three-way valve.

[0129] (7) In the three-way valve 10 of the above-described embodiment, the axial directions of the first communication hole B1 and the second communication hole B2 in the manifold 50 are parallel to the stacking direction (Z direction) of the plurality of manifold members 60. The first chamber A1, the second chamber A2, the third chamber A3, the fourth chamber A4, the first communication hole B1, and the second communication hole B2 in the manifold 50 are formed across two or more manifold members 60.

[0130] According to this three-way valve 10, an internally piloted double three-way valve can be configured using the manifold 50 having a stacked structure. Thereby, the internally piloted double three-way valve can be miniaturized and lightened.

[0131] (8) The oxygen concentrator M of the above-described embodiment generates high-concentration oxygen containing oxygen at a concentration higher than the oxygen concentration in the air and supplies the generated high-concentration oxygen. The oxygen concentrator M includes: an adsorbent material that can adsorb nitrogen or oxygen contained in the air and desorb the adsorbed nitrogen or oxygen; a first adsorption cylinder 101 and a second adsorption cylinder 102 that house the adsorbent material; an air supply pipe 106 that supplies air, which is a raw material for high-concentration oxygen, to the first adsorption cylinder 101 and the second adsorption cylinder 102; an exhaust pipe 107 that exhausts the generated high-concentration oxygen from the first adsorption cylinder 101 and the second adsorption cylinder 102; and a switching valve 111 that alternately selects the first adsorption cylinder 101 or the second adsorption cylinder 102, connects the selected one to the air supply pipe 106, and connects the other to the exhaust pipe 107. The switching valve 111 is constituted by the three-way valve 10.

[0132] Since the three-way valve 10 is adopted in the switching valve 111 of this oxygen concentrator M, miniaturization and weight reduction can be achieved. In addition, there are a portable type suitable for use outdoors and a fixed type suitable for use indoors in the oxygen concentrator M. In the oxygen concentrator M, it is preferable to adopt the three-way valve 10 as the switching valve 111 both in the portable type and the fixed type, but it is particularly preferable to adopt the three-way valve 10 as the switching valve 111 in the case of the portable type.

[0133] In addition, the oxygen concentrator of the present disclosure uses a nitrogen adsorbent material such as zeolite as the adsorbent material, but the present disclosure can also be applied to an oxygen concentrator that uses an oxygen adsorbent material as the adsorbent material. Symbol Explanation

[0134] M Oxygen concentrator; 10 Three-way valve; 23 First valve element (valve element); 23b First diaphragm (first diaphragm); 23c Second diaphragm (first diaphragm); 24 Second valve element (valve element); 24b Third diaphragm (second diaphragm); 24c Fourth diaphragm (second diaphragm); 30 Pilot mechanism (switching mechanism); 50 Manifold; 51 First valve chamber (valve chamber); 52 Second valve chamber (valve chamber); 60 Manifold member; 71 Air supply port (first port); 72 Exhaust port (second port); 73 First air supply and exhaust port (third port); 74 Second air supply and exhaust port (third port); 75 Air supply passage (first passage); 76 Exhaust passage (second passage); 77 First air supply and exhaust passage (third passage); 78 Second air supply and exhaust passage (third passage); 91 First pilot passage; 92 Second pilot passage; 93 Third pilot passage; 94 Fourth pilot passage; C1 First communication path; C2 Second communication path; P1 First position; P2 Second position.

Claims

1. A three-way valve, characterized in that, Comprising: A manifold, the manifold being formed with a flow path, the flow path including a first port, a first passage connected to the first port, a second port, a second passage connected to the second port, a third port, a third passage connected to the third port, and a valve chamber communicating with the first passage, the second passage, and the third passage; A valve core, the valve core being received in the valve chamber and capable of being displaced to a first position where the first port and the third port communicate or a second position where the second port and the third port communicate; And A switching mechanism, the switching mechanism switching the position of the valve core to the first position or the second position, The manifold is constituted by laminating a plurality of plate-shaped manifold members in the plate thickness direction.

2. The three-way valve according to claim 1, wherein The flow path formed in the manifold includes: a first valve chamber as the first of the valve chambers; a second valve chamber as the second of the valve chambers; a first communication path that connects the first valve chamber and the second valve chamber and is connected to the first passage; a second communication path that connects the first valve chamber and the second valve chamber and is connected to the second passage; a first valve chamber side third port as the third port on the first valve chamber side; a first valve chamber side third passage as the third passage on the first valve chamber side; a second valve chamber side third port as the third port on the second valve chamber side; and a second valve chamber side third passage as the third passage on the second valve chamber side, The valve core includes a first valve core as the first of the valve cores and a second valve core as the second of the valve cores, The first valve core is received in the first valve chamber, and the second valve core is received in the second valve chamber.

3. The three-way valve according to claim 2, wherein The first communication path and / or the second communication path are formed by depressions on the boundary surfaces of adjacent ones of the manifold members.

4. The three-way valve according to claim 2 or 3, wherein The flow path formed in the manifold further includes: a first pilot passage communicating with the first valve chamber; a second pilot passage communicating with the second valve chamber; and a third pilot passage that connects the first pilot passage or the second pilot passage and the first passage, The first valve core further has a first diaphragm and a second diaphragm, and the first diaphragm and the second diaphragm can be deformed by the pressure of the fluid supplied to the first valve chamber via the first pilot passage, The second valve core further has a third diaphragm and a fourth diaphragm, and the third diaphragm and the fourth diaphragm can be deformed by the pressure of the fluid supplied to the second valve chamber via the second pilot passage, The switching mechanism is composed of a pilot valve. By the pilot valve, the communication target of the third pilot passage is switched to either the first pilot passage or the second pilot passage, so that either the first spool or the second spool is located at the first position by the deformation of the first diaphragm and the second diaphragm and the third diaphragm and the fourth diaphragm, and the other of the first spool and the second spool is located at the second position.

5. The three-way valve according to claim 4, characterized in that The flow path formed in the manifold further includes a fourth pilot passage that connects the first pilot passage or the second pilot passage to the second passage, The pilot valve switches the communication target of the fourth pilot passage to either the first pilot passage or the second pilot passage, so that the first diaphragm and the second diaphragm or the third diaphragm and the fourth diaphragm are deformed.

6. The three-way valve according to claim 4, characterized in that The first spool includes: a first connecting rod; the first diaphragm connected to one end of the first connecting rod; the second diaphragm connected to the other end of the first connecting rod; a first valve portion provided on the first diaphragm; and a second valve portion provided on the second diaphragm, The second spool includes: a second connecting rod; the third diaphragm connected to one end of the second connecting rod; the fourth diaphragm connected to the other end of the second connecting rod; a third valve portion provided on the third diaphragm; and a fourth valve portion provided on the fourth diaphragm, The first valve chamber has: a first chamber for accommodating the first diaphragm; a second chamber for accommodating the second diaphragm; a first communication hole that connects the first chamber and the second chamber and accommodates the first connecting rod; a first valve seat formed at an end of the first communication hole on the first chamber side and facing the first valve portion; and a second valve seat formed at an end of the first communication hole on the second chamber side and facing the second valve portion, The second valve chamber has: a third chamber for accommodating the third diaphragm; a fourth chamber for accommodating the fourth diaphragm; a second communication hole that connects the third chamber and the fourth chamber and accommodates the second connecting rod; a third valve seat formed at an end of the second communication hole on the third chamber side and facing the third valve portion; and a fourth valve seat formed at an end of the second communication hole on the fourth chamber side and facing the fourth valve portion, The first communication path connects the second chamber and the fourth chamber, The second communication path connects the first chamber and the third chamber, The third pilot passage is connected to the first passage via the first communication path, The fourth pilot passage is connected to the second passage via the second communication path.

7. The three-way valve according to claim 6, characterized in that In the manifold, The axial directions of the first communication hole and the second communication hole are parallel to the stacking direction of the plurality of manifold members. The first chamber, the second chamber, the third chamber, the fourth chamber, the first communication hole, and the second communication hole are formed across two or more of the manifold members.

8. An oxygen concentration device that generates high-concentration oxygen containing oxygen at a concentration higher than the oxygen concentration in the air and supplies the generated high-concentration oxygen, characterized in that, Comprising: An adsorbent material capable of adsorbing nitrogen or oxygen contained in air and desorbing the adsorbed nitrogen or oxygen; A first adsorption cylinder and a second adsorption cylinder for housing the adsorbent material; An air supply pipe for supplying air, which is a raw material for high-concentration oxygen, to the first adsorption cylinder and the second adsorption cylinder; An exhaust pipe for exhausting the generated high-concentration oxygen from the first adsorption cylinder and the second adsorption cylinder; And A switching valve that alternately selects the first adsorption cylinder or the second adsorption cylinder, and while connecting the selected one to the air supply pipe, connects the other to the exhaust pipe, The switching valve is constituted by the three-way valve described in claim 4.

Images