Diaphragm-type on / off valve and toilet device

Abstract

To provide a diaphragm-type on / off valve and toilet device that can effectively expel air even if air enters. [Solution] The diaphragm-type on / off valve 10 comprises a pressure chamber 11 to which a back pressure path 12 is connected, a diaphragm valve 14 that closes the open end of the pressure chamber 11, and an air accumulation prevention unit 15 that moves the air in the pressure chamber 11 toward the back pressure path 12.

Description

Technical Field

[0001] The present disclosure relates to a diaphragm type on-off valve and a toilet device.

Background Art

[0002] Patent Document 1 discloses a valve unit using a diaphragm valve.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a valve unit using a diaphragm valve, there is a concern that abnormal noise may occur when air enters the pressure chamber or the operation of the diaphragm valve may be hindered. Therefore, a technique for quickly discharging air from the pressure chamber even if air enters the pressure chamber is desired.

[0005] The present disclosure has been made in view of the above conventional situation, and an object to be solved is to provide a diaphragm type on-off valve and a toilet device that can discharge air well even when air enters.

Means for Solving the Problems

[0006] The diaphragm type on-off valve according to the first disclosure includes a pressure chamber to which a back pressure path is connected, a diaphragm valve that closes an open end of the pressure chamber, and an air accumulation prevention portion that moves air in the pressure chamber toward the back pressure path.

[0007] The toilet device according to the second disclosure includes the diaphragm type on-off valve according to the first disclosure.

Brief Description of the Drawings

[0008] [Figure 1] This is a side view showing a toilet device equipped with a diaphragm-type on / off valve according to Embodiment 1. [Figure 2] This is a side cross-sectional view showing a diaphragm-type on / off valve according to Embodiment 1. [Figure 3] Figure 2 shows a cross-sectional view taken along arrow AA, illustrating the diaphragm valve divided equally into four regions. [Figure 4] Figure 2 shows a cross-sectional view taken along arrow AA, illustrating the diaphragm valve with three imaginary lines attached. [Figure 5] This is a side cross-sectional view showing a diaphragm-type on-off valve according to Embodiment 1, where the solenoid valve is in the open position and the main valve of the diaphragm valve has moved upward. [Figure 6] This is a side cross-sectional view showing a diaphragm-type on / off valve according to Embodiment 2. [Figure 7] This is a side cross-sectional view showing a diaphragm-type on / off valve according to Embodiment 3. [Figure 8] This is a side cross-sectional view showing a diaphragm-type on / off valve according to another embodiment. [Figure 9] This is a side cross-sectional view showing a diaphragm-type on / off valve according to another embodiment. [Figure 10] This is a side cross-sectional view showing yet another embodiment of a diaphragm-type on / off valve. [Modes for carrying out the invention]

[0009] First, embodiments of this disclosure will be listed and described. Any combination of the following embodiments, without causing any inconsistency, is also included as a form for carrying out the invention.

[0010] [1] The diaphragm-type on-off valve of the present disclosure comprises a pressure chamber to which a back pressure path is connected, a diaphragm valve that closes the open end of the pressure chamber, and an air accumulation prevention unit that moves the air in the pressure chamber toward the back pressure path. With this configuration, the air accumulation prevention unit guides the air from the pressure chamber toward the back pressure path, thereby removing the air from the pressure chamber.

[0011] [2] The diaphragm-type on / off valve described in [1] above is for toilet equipment. This configuration makes it possible to realize a toilet equipment that smoothly supplies flushing water to the toilet without generating any abnormal noise.

[0012] [3] In the diaphragm-type on-off valve described in [1] above, the air accumulation prevention section has a wall surface forming the pressure chamber that extends upward toward the back pressure path. With this configuration, the wall surface can guide the air in the pressure chamber toward the back pressure path.

[0013] [4] In the diaphragm-type on-off valve described in [1] above, a hole is formed through the diaphragm valve that connects the pressure chamber and the flow path on the upstream side of the diaphragm valve, and the position of the hole and the position of the inlet of the back pressure path connected to the pressure chamber are offset when viewed from the direction of movement of the diaphragm valve. For example, if the position of the hole and the position of the inlet of the back pressure path connected to the pressure chamber are in the same position, the water flowing into the pressure chamber from the hole will flow directly into the back pressure path. In contrast, according to the present disclosure, the water flowing into the pressure chamber from the hole flows in a way that agitates the inside of the pressure chamber, and this flow moves the air inside the pressure chamber, making it easier for the water to flow into the inlet of the back pressure path.

[0014] [5] In the diaphragm type on-off valve described in [4] above, when a straight line passing through the center of the diaphragm valve and the hole is defined as a first virtual straight line when viewed from the moving direction, and a straight line passing through the center of the diaphragm valve and perpendicular to the first virtual straight line is defined as a second virtual straight line, the opposing surface of the pressure chamber facing the diaphragm valve is inclined so as to move away from the diaphragm valve from one side where the hole is formed toward the other side with respect to the second virtual straight line, and the inlet of the back pressure path is arranged on the other side. According to this configuration, the position of the inlet of the back pressure path can be arranged at a high position, and air can be efficiently discharged.

[0015] [6] In the diaphragm type on-off valve described in [5] above, when a straight line passing through the hole and perpendicular to the first virtual straight line is defined as a third virtual straight line when viewed from the moving direction, in the opposing surface, the region on the opposite side of the center of the diaphragm valve across the third virtual straight line extends upward toward the inlet of the back pressure path. According to this configuration, even if air enters the region on the opposite side of the center of the diaphragm valve across the third virtual straight line, the air can be well guided toward the inlet of the back pressure path.

[0016] [7] In the diaphragm type on-off valve described in [1] above, a hole connecting the pressure chamber and the flow path on the upstream side of the diaphragm valve penetrates and is formed in the diaphragm valve, and the central axis of the diaphragm valve is either inclined with respect to the vertical direction or perpendicular to the vertical direction, and the hole is arranged below the central axis of the diaphragm valve. According to this configuration, when water flows into the pressure chamber from the hole and stirs the water in the pressure chamber, the entire air in the pressure chamber can be collected at the upper end portion of the pressure chamber while flowing the air in the pressure chamber.

[0017] [8] In the diaphragm type on-off valve described in [1] above, more than half of the region of the opposing surface of the pressure chamber facing the diaphragm valve extends upward. According to this configuration, the air in the pressure chamber can be easily collected at the upper end portion of the pressure chamber.

[0018] [9] In the diaphragm type on-off valve described in [1] above, the central axis of the diaphragm valve is either inclined with respect to the vertical direction or orthogonal to the vertical direction, the inlet of the back pressure path is connected to the upper end of the pressure chamber away from the diaphragm valve, and the surface between the diaphragm valve and the inlet of the back pressure path in the pressure chamber extends upward from the diaphragm valve toward the inlet of the back pressure path. According to this configuration, even if the central axis of the diaphragm valve is inclined or orthogonal to the vertical direction, air can flow well from the pressure chamber into the back pressure path through the surface between the diaphragm valve and the inlet.

[0019]

[10] In the diaphragm type on-off valve described in [4] above, the flow passage area of the hole gradually decreases toward the pressure chamber. According to this configuration, the flow velocity of the water flowing into the pressure chamber through the hole can be increased, so that the air in the pressure chamber can be more easily pushed out compared to the case of a hole with no change in the flow passage area.

[0020]

[11] In the diaphragm type on-off valve described in [4] above, a plurality of the holes are formed. According to this configuration, the flow rate of the water flowing into the pressure chamber can be increased, and air can be more easily pushed out compared to the case where there is one hole.

[0021]

[12] In the diaphragm type on-off valve described in [1] above, when the diaphragm valve moves into the pressure chamber, the air accumulation prevention part makes the diaphragm valve adhere to more than half of the area of the wall surface of the pressure chamber. According to this configuration, a configuration capable of reliably pushing out air from the pressure chamber can be achieved.

[0022]

[13] In the diaphragm-type on-off valve described in [1] above, a hole is formed through the diaphragm valve that connects the pressure chamber and the flow path on the upstream side of the diaphragm valve, and a guide wall is provided on the surface of the diaphragm valve facing the pressure chamber that rises up to surround the hole. With this configuration, water can be guided to the position where air has accumulated without diffusing the flow of water in the pressure chamber, thereby enabling efficient air flow in the pressure chamber.

[0023] The toilet device of

[14] is equipped with a diaphragm-type on / off valve as described in any of [1] to

[13] above. This configuration makes it possible to realize a toilet device that smoothly supplies flushing water to the toilet without generating any abnormal noise. <Embodiment 1> Embodiment 1, which embodies the diaphragm-type on-off valve and toilet device of the present disclosure, will be described with reference to the drawings. In the following description, the positive direction of the Z-axis in each figure is upward. For example, as shown in Figure 1, the toilet device 100 comprises a diaphragm-type on-off valve 10 according to Embodiment 1 and a urinal 30. Specifically, the diaphragm-type on-off valve 10 is provided between an upstream flow path 30A that protrudes from the wall surface W on which the urinal 30 is installed and a downstream flow path 30B that supplies flushing water to the bowl surface 30C of the urinal 30. The upstream flow path 30A supplies tap water to the toilet device 100 as flushing water. The diaphragm-type on-off valve 10 is for use in a toilet device.

[0024] [Configuration of a diaphragm-type on / off valve] As shown in Figure 2, the diaphragm-type on-off valve 10 includes a pressure chamber 11, a back pressure path 12, a solenoid valve 13, a diaphragm valve 14, and an air accumulation prevention section 15.

[0025] The pressure chamber 11 is formed as a cylindrical space with its central axis oriented vertically. The lower end of the pressure chamber 11 is open downwards. The upper surface 11A of the pressure chamber 11 is inclined in a direction intersecting the vertical direction (up and down direction). A limiting projection 11B is provided on the upper surface 11A of the pressure chamber 11, projecting downwards. In the pressure chamber 11, the upper end of the outer circumferential surface and the outer circumferential edge of the upper surface 11A are connected by a curved surface 11C that curves inward to reduce in diameter.

[0026] The back pressure path 12 is connected to the pressure chamber 11 and the downstream flow path 30B. One end of the back pressure path 12 is connected as an inlet 12A at the highest point on the upper surface of the pressure chamber 11. The other end of the back pressure path 12 is connected as an outlet 12B to the downstream flow path 30B.

[0027] The solenoid valve 13 is located in the middle of the back pressure path 12. The operation of the solenoid valve 13 can be controlled by the control unit 16. For example, the control unit 16 is configured as a microcomputer. When the control unit 16 opens the solenoid valve 13, the back pressure path 12 becomes an open state in which fluid is allowed to move between the pressure chamber 11 and the downstream flow path 30B (see Figure 5). When the control unit 16 closes the solenoid valve 13, the back pressure path 12 becomes a restricted state in which fluid is restricted between the pressure chamber 11 and the downstream flow path 30B.

[0028] The diaphragm valve 14 is provided to close the open end located at the lower end of the pressure chamber 11. The diaphragm valve 14 has a main valve 14A and a valve seat 14B on which the main valve 14A is seated. The main valve 14A has a disc-shaped rubber diaphragm membrane 14C and a disc-shaped synthetic resin retaining part 14D that holds the diaphragm membrane 14C. The retaining part 14D is provided with a connecting part 14E that connects the diaphragm membrane 14C to the retaining part 14D. The connecting part 14E penetrates the central part of the diaphragm membrane 14C in the direction of film thickness and connects to the retaining part 14D. The diaphragm membrane 14C is sandwiched from above and below by the connecting part 14E and the retaining part 14D. The central part of the retaining part 14D has a convex portion 14L that protrudes upward (towards the pressure chamber 11).

[0029] A compression coil spring 14K is positioned inside the pressure chamber 11. The compression coil spring 14K is positioned with its axis oriented vertically, with its upper end inserted through the limiting projection 11B and its lower end inserted through the convex portion 14L. The compression coil spring 14K acts to press the main valve 14A of the diaphragm valve 14 downward.

[0030] The valve seat 14B is formed as part of the upstream end of the downstream flow path 30B. The valve seat 14B has a cylindrical shape with its central axis oriented vertically.

[0031] The diaphragm membrane 14C has a contact surface 14F that contacts the upper end surface of the valve seat 14B from above. The contact surface 14F is formed as a surface perpendicular to the central axis of the downstream flow path 30B.

[0032] The holding portion 14D is provided with a cylindrical hole projection 14M that protrudes downward. The hole projection 14M is positioned offset from the center of the holding portion 14D. A hole 14H is formed in the holding portion 14D, penetrating it in the vertical direction. The hole 14H is positioned on the central axis of the hole projection 14M. A through hole 14G is formed in the diaphragm membrane 14C, penetrating it in the direction of film thickness. The hole projection 14M of the holding portion 14D is inserted through the through hole 14G. The hole projection 14M faces the upstream flow path 30A through the through hole 14G. The hole 14H connects the inside of the pressure chamber 11 and the upstream flow path 30A, allowing for constant water flow between the inside of the pressure chamber 11 and the upstream flow path 30A.

[0033] The upper surface 11A, which is part of the wall surface forming the pressure chamber 11, corresponds to the air accumulation prevention section 15. For example, when air enters the pressure chamber 11 from the upstream flow path 30A through the hole 14H, the air is guided along the upper surface 11A to the inlet 12A of the back pressure path 12 and flows into the back pressure path 12. In this way, the upper surface 11A (air accumulation prevention section 15) of the pressure chamber 11 moves the air inside the pressure chamber 11 toward the back pressure path 12. In other words, the air accumulation prevention section 15 is formed by extending the upper surface 11A, which is the wall surface forming the pressure chamber 11, upward toward the back pressure path 12.

[0034] In Embodiment 1, the direction of movement of the main valve 14A in the diaphragm valve 14 is vertical. The main valve 14A of the diaphragm valve 14 is pressed downward by the compression coil spring 14K. As a result, the contact surface 14F contacts the valve seat 14B from above. At this time, the position of the main valve 14A of the diaphragm valve 14 is at the lowest end of the range of movement in the direction of movement, and the supply of water from the upstream flow path 30A to the downstream flow path 30B is restricted.

[0035] When the solenoid valve 13 opens, the back pressure path 12 becomes permissible, the water pressure in the pressure chamber 11 decreases, and the water pressure in the upstream flow path 30A exceeds the water pressure in the pressure chamber 11. As a result, the main valve 14A of the diaphragm valve 14 moves upward, the contact surface 14F separates upward from the valve seat 14B, and the convex portion 14L of the retaining portion 14D contacts the limiting projection 11B from below (see Figure 5). At this time, the position of the main valve 14A of the diaphragm valve 14 is at the uppermost end of the range of movement in the direction of movement, and the supply of water from the upstream flow path 30A to the downstream flow path 30B is permitted (see Figure 5), and the water supplied to the downstream flow path 30B flows down the bowl surface 30C (see Figure 1).

[0036] As shown in Figure 3, when the pressure chamber 11 is viewed from the direction of movement (up and down), the position of the hole 14H and the position of the inlet 12A of the back pressure path 12 connected to the pressure chamber 11 are misaligned. Also, when the diaphragm valve 14 is divided equally into four regions, the position of the hole 14H and the position of the inlet 12A are located in opposite regions.

[0037] As shown in Figure 4, when viewing the pressure chamber 11 from the direction of movement (up and down), the line passing through the center C1 of the diaphragm valve 14 and the center C2 of the hole 14H is defined as the first virtual line V1, and the line passing through the center C1 of the diaphragm valve 14 and perpendicular to the first virtual line V1 is defined as the second virtual line V2. In this case, the upper surface 11A of the pressure chamber 11 (the opposing surface facing the diaphragm valve 14) is inclined to move away from the diaphragm valve 14 from one side where the hole 14H is formed to the other side, relative to the second virtual line V2 (center C1 of the diaphragm valve 14) (see Figure 2). On the other side of the second virtual line V2 where the hole 14H is not formed, the inlet 12A of the back pressure path 12 is located.

[0038] Viewing the pressure chamber 11 from the direction of movement (vertical direction), the line passing through the center C2 of the hole 14H and perpendicular to the first virtual line V1 is defined as the third virtual line V3. In this case, on the upper surface 11A of the pressure chamber 11, the region R on the opposite side of the center C1 of the diaphragm valve 14, with the third virtual line V3 (center C2 of the hole 14H) in between, extends upward toward the inlet 12A of the back pressure path 12 (see Figure 2). More than half of the upper surface 11A of the pressure chamber 11 (the opposing surface facing the diaphragm valve 14) extends upward toward the inlet 12A and slopes (see Figure 2). The area of ​​the upper surface 11A of the pressure chamber 11 that extends upward toward the inlet 12A is preferably 3 / 4 or more of the upper surface 11A, and more preferably almost the entire upper surface 11A.

[0039] [An example of the operation of a diaphragm-type on / off valve] When the solenoid valve 13 is closed by the control unit 16, the back pressure path 12 is in a restricted state where the flow of fluid between the pressure chamber 11 and the downstream flow path 30B is limited (see Figure 2). Since the pressure chamber 11 is connected to the upstream flow path 30A by the hole 14H, the water pressure in the pressure chamber 11 is the same as the water pressure in the upstream flow path 30A. At this time, the contact surface 14F of the diaphragm membrane 14C is in contact with the valve seat 14B from above (see Figure 2). As a result, the supply of tap water from the upstream flow path 30A to the downstream flow path 30B is restricted.

[0040] As shown in Figure 5, the control unit 16 changes the solenoid valve 13 from a closed state to an open state. Then, the back pressure path 12 enters a permissible state where fluid flow is allowed between the pressure chamber 11 and the downstream flow path 30B. As a result, the water pressure in the pressure chamber 11 is released to the downstream flow path 30B via the back pressure path 12 and rapidly decreases. That is, the water pressure in the pressure chamber 11 becomes lower than the water pressure in the upstream flow path 30A. As a result, the main valve 14A of the diaphragm valve 14 is pushed up by the water pressure in the upstream flow path 30A, and the contact surface 14F separates upward from the valve seat 14B. In this way, the tap water flows from the upstream flow path 30A to the downstream flow path 30B and flows down the bowl surface 30C (see Figure 1). At this time, tap water also flows into the pressure chamber 11 through the hole 14H. If air enters the pressure chamber 11, the flow of tap water entering the pressure chamber 11 through the hole 14H agitates the tap water in the pressure chamber 11, causing the air to flow. The air in the pressure chamber 11 then flows along the upper surface 11A into the back pressure path 12 and is discharged from the pressure chamber 11.

[0041] When the control unit 16 changes the solenoid valve 13 from the open state to the closed state, the back pressure path 12 becomes restricted (see Figure 2). As a result, the water pressure in the pressure chamber 11 changes to the same water pressure as the upstream flow path 30A. Then, the main valve 14A of the diaphragm valve 14 is pressed downward by the elastic repulsive force of the compression coil spring 14K, and the contact surface 14F contacts the valve seat 14B from above (see Figure 2). In this way, the supply of water from the upstream flow path 30A to the downstream flow path 30B is stopped.

[0042] As described above, the diaphragm-type on-off valve 10 of Embodiment 1 comprises a pressure chamber 11 to which a back pressure path 12 is connected, a diaphragm valve 14 that closes the open end of the pressure chamber 11, and an air accumulation prevention unit 15 that moves the air in the pressure chamber 11 toward the back pressure path 12. With this configuration, the air accumulation prevention unit 15 (upper surface 11A of the pressure chamber 11) guides the air from the pressure chamber 11 toward the back pressure path 12, thereby removing the air from the pressure chamber 11.

[0043] The diaphragm-type on / off valve 10 is for the toilet device 100. This configuration makes it possible to realize a toilet device 100 that smoothly supplies flushing water to the bowl surface 30C of the urinal 30 without generating any abnormal noise.

[0044] In the diaphragm-type on-off valve 10, the air accumulation prevention section 15 has a wall surface that forms the pressure chamber 11 and extends upward toward the inlet 12A of the back pressure path 12. With this configuration, the wall surface can guide the air in the pressure chamber 11 toward the back pressure path 12.

[0045] In the diaphragm-type on-off valve 10, a hole 14H is formed through the diaphragm valve 14, connecting the pressure chamber 11 and the upstream flow path 30A of the diaphragm valve 14. When viewed from the direction of movement (up and down) of the diaphragm valve 14, the position of the hole 14H and the position of the inlet 12A of the back pressure path 12 connected to the pressure chamber 11 are offset. With this configuration, if the position of the hole 14H and the position of the inlet 12A of the back pressure path 12 connected to the pressure chamber 11 were in the same position, the water flowing into the pressure chamber 11 from the hole 14H would flow directly into the back pressure path 12. In contrast, according to this disclosure, the water flowing into the pressure chamber 11 from the hole 14H flows in a way that agitates the inside of the pressure chamber 11, and this flow moves the air inside the pressure chamber 11, making it easier for the water to flow into the inlet 12A of the back pressure path 12.

[0046] In the diaphragm-type on-off valve 10, the line passing through the center C1 of the diaphragm valve 14 and the center C2 of the hole 14H, when viewed from the direction of movement (vertical direction), is defined as the first virtual line V1, and the line passing through the center C1 of the diaphragm valve 14 and perpendicular to the first virtual line V1 is defined as the second virtual line V2. In this case, the upper surface 11A (opposing surface) of the pressure chamber 11 facing the diaphragm valve 14 is inclined to move away from the diaphragm valve 14 from one side where the hole 14H is formed to the other side, relative to the second virtual line V2, and the inlet 12A of the back pressure path 12 is located on the other side. With this configuration, the position of the inlet 12A of the back pressure path 12 can be set at a higher position, and air can be discharged efficiently.

[0047] In the diaphragm-type on-off valve 10, the third virtual line V3 is defined as a line passing through the center C2 of the hole 14H and perpendicular to the first virtual line V1 when viewed from the direction of movement (up and down direction). In this case, on the upper surface 11A (opposing surface) of the pressure chamber 11, the region R on the opposite side of the center C1 of the diaphragm valve 14, with the third virtual line V3 in between, extends upward toward the inlet 12A of the back pressure path 12. With this configuration, even if air enters the region R on the opposite side of the center C1 of the diaphragm valve 14, with the third virtual line V3 in between, that air can be effectively guided toward the inlet 12A of the back pressure path 12.

[0048] In the diaphragm-type on-off valve 10, more than half of the upper surface 11A (opposing surface) of the pressure chamber 11 facing the diaphragm valve 14 in the pressure chamber 11 extends upward. This configuration makes it easier to collect the air in the pressure chamber 11 at the upper end of the pressure chamber 11.

[0049] The toilet device 100 is equipped with the diaphragm-type on / off valve 10 of Embodiment 1. With this configuration, a toilet device 100 can be realized that smoothly supplies flushing water to the urinal 30 without generating any abnormal noise.

[0050] <Embodiment 2> A diaphragm-type on-off valve 110 according to Embodiment 2, which embodies the present disclosure, will be described with reference to Figure 6. The diaphragm-type on-off valve 110 according to Embodiment 2 differs from Embodiment 1 in that the central axis Ca1 of the diaphragm valve 14 is perpendicular to the vertical direction, among other things. Components similar to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0051] In the diaphragm-type on-off valve 110 of Embodiment 2, as shown in Figure 6, the central axis Ca1 of the diaphragm valve 14 is perpendicular to the vertical direction (up and down direction). The hole 14H is located below the central axis Ca1 of the diaphragm valve 14.

[0052] The inlet 112A of the back pressure path 112 is connected to the upper end of the pressure chamber 111, away from the diaphragm valve 14. The outer circumferential surface 111A of the pressure chamber 111 between the diaphragm valve 14 and the inlet 112A of the back pressure path 112 is formed to extend upward from the diaphragm valve 14 toward the inlet 112A of the back pressure path 112. The outer circumferential surface 111A of the pressure chamber 111 between the diaphragm valve 14 and the inlet 112A of the back pressure path 112 corresponds to the air accumulation prevention section 115.

[0053] In the diaphragm-type on-off valve 110, a hole 14H is formed through the diaphragm valve 14, connecting the pressure chamber 111 and the upstream flow path 30A of the diaphragm valve 14. The central axis Ca1 of the diaphragm valve 14 is perpendicular to the vertical direction, and the hole 14H is located below the central axis Ca1 of the diaphragm valve 14. With this configuration, when tap water flows into the pressure chamber 111 from the hole 14H and agitates the tap water in the pressure chamber 111, the entire air in the pressure chamber 111 can be circulated and collected at the upper end of the pressure chamber 111.

[0054] In the diaphragm-type on-off valve 110, the central axis Ca1 of the diaphragm valve 14 is perpendicular to the vertical direction. The inlet 112A of the back pressure path 112 is connected to the upper end of the pressure chamber 111 at a position away from the diaphragm valve 14. The outer circumferential surface 111A between the diaphragm valve 14 and the inlet 112A of the back pressure path 112 in the pressure chamber 111 extends upward from the diaphragm valve 14 toward the inlet 112A of the back pressure path 112. With this configuration, even if the central axis Ca1 of the diaphragm valve 14 is perpendicular to the vertical direction, the outer circumferential surface 111A allows air to flow smoothly from the pressure chamber 111 toward the back pressure path 112.

[0055] <Embodiment 3> A diaphragm-type on-off valve 210 according to Embodiment 3, which embodies the present disclosure, will be described with reference to Figure 7. The diaphragm-type on-off valve 210 according to Embodiment 3 differs from Embodiments 1 and 2 in the shape of the hole 114H formed in the holding portion 114D of the diaphragm valve 114, and in that a guide wall 114J is provided in the holding portion 114D. Components similar to those in Embodiments 1 and 2 are denoted by the same reference numerals and their descriptions are omitted.

[0056] In the diaphragm-type on-off valve 210 of Embodiment 3, as shown in Figure 7, the inner circumferential surface of the hole 114H formed in the holding portion 114D of the main valve 114A of the diaphragm valve 114 is formed as a frustoconical tapered hole that narrows in diameter toward the pressure chamber 11. In other words, the flow area of ​​the hole 114H decreases toward the pressure chamber 11.

[0057] On the surface of the diaphragm valve 114D facing the pressure chamber 11, a guide wall 114J is provided that rises in a cylindrical shape, surrounding the hole 114H. The inner diameter of the guide wall 114J is larger than the inner diameter of the hole 114H. On the surface of the diaphragm valve 114D facing the pressure chamber 11, the inner circumferential surface of the guide wall 114J and the inner circumferential surface of the hole 114H are formed in a stepped manner. The guide wall 114J is not limited to a cylindrical shape, but may also be a polygonal or elliptical cylindrical shape.

[0058] In the diaphragm-type on-off valve 210, the flow area of ​​the hole 114H gradually decreases toward the pressure chamber 11. With this configuration, the flow velocity of the tap water flowing into the pressure chamber 11 through the hole 114H can be increased, so compared to a hole with no change in flow area, the tap water flows into the pressure chamber 11 more forcefully, making it easier to push out the air.

[0059] In the diaphragm-type on-off valve 210, the diaphragm valve 114 has a hole 114H that passes through it, connecting the pressure chamber 11 and the flow path 30A on the upstream side of the diaphragm valve 114. On the surface of the holding portion 114D of the diaphragm valve 114 facing the pressure chamber 11, a cylindrical guide wall 114J is provided that rises up, surrounding the hole 114H. With this configuration, the flow of tap water can be guided to the position where air has accumulated without diffusing the flow of tap water within the pressure chamber 11, thereby enabling efficient air flow within the pressure chamber 11.

[0060] <Other Embodiments> This disclosure is not limited to the embodiments described above and in the drawings, and the technical scope of this disclosure also includes, for example, the following embodiments.

[0061] Unlike the above embodiment, the diaphragm valve 214 may have a form such as the retaining portion 214D of the main valve 214A shown in Figure 8. Specifically, the retaining portion 214D is formed to be thick in the direction of movement. The hole 214H penetrates the retaining portion 214D in the vertical direction. The upper surface of the retaining portion 214D is formed in a planar shape perpendicular to the direction of movement. The upper surface 211A of the pressure chamber 211 is formed in a planar shape parallel to the upper surface of the retaining portion 214D. The outer diameter of the retaining portion 214D is formed to be slightly smaller than the inner diameter of the inner circumferential surface of the pressure chamber 211. When the main valve 214A of the diaphragm valve 214 moves upward so as to enter the pressure chamber 211, the upper surface of the retaining portion 214D comes into close contact with the upper surface 211A of the pressure chamber 211 (the position shown by the dashed line in Figure 8). The upper surface 211A of the pressure chamber 211 and the upper surface of the retaining portion 214D correspond to the air accumulation prevention portion 215. Preferably, the area in which the upper surface of the retaining portion 214D is in close contact with the upper surface 211A of the pressure chamber 211 is more than half the area of ​​the wall surface of the pressure chamber 211. Alternatively, as shown in Figure 9, the upper surface 311A ​​of the pressure chamber 311 may be made to protrude downward, and the shape of the upper surface of the retaining portion 314D in the main valve 314A of the diaphragm valve 314 may be set to conform to the shape of the upper surface 311A. The upper surface 311A ​​of the pressure chamber 311 and the upper surface of the retaining portion 314D correspond to the air accumulation prevention portion 315. With this configuration, it is possible to reliably push air out from the pressure chambers 211 and 311. The area in which the diaphragm valve 214 (314) is in close contact with the wall surface of the pressure chamber 211 (311) is preferably 3 / 4 or more of the wall surface of the pressure chamber 211 (311), and more preferably almost the entire surface.

[0062] Unlike the above embodiment, the pressure chamber may take the form shown in Figure 10, such as the pressure chamber 411. Specifically, the pressure chamber 411 is formed as a cylindrical space with its central axis Ca2 oriented vertically. The entire outer peripheral edge of the upper surface 411A of the pressure chamber 411 is formed as a horizontal surface 411D. The inclined surface 411E of the upper surface 411A that is inward from the horizontal surface 411D is inclined in a frustoconical shape so as to decrease in diameter upward. One end of the back pressure path 212 is connected as an inlet 212A to the highest position on the upper surface of the pressure chamber 411 (the upper edge of the inclined surface 411E). The horizontal dimension from the central axis Ca2 of the pressure chamber 411 to the outer peripheral edge of the inclined surface 411E is greater than the horizontal dimension from the central axis Ca2 of the pressure chamber 411 to the hole 14H. The back pressure path 212 may be coaxial with the central axis Ca2 of the pressure chamber 411, or it may be eccentric with respect to the central axis Ca2. In other words, the back pressure path 212 only needs to be located in the center of the pressure chamber 411. The inclined surface 411E of the pressure chamber 411 corresponds to the air accumulation prevention section 415.

[0063] Unlike the embodiments described above, diaphragm-type on / off valves may also be used in flush toilets, bidet devices, toilet seat devices, and the like.

[0064] Unlike the above embodiment, the cross-sectional shape perpendicular to the axis in the hole may be elliptical or polygonal.

[0065] Unlike the above embodiment, the diaphragm valve may have multiple holes.

[0066] Unlike the above embodiment, the upper surface of the pressure chamber may be formed as a surface that curves upward toward the back pressure path.

[0067] Unlike Embodiment 2 described above, the central axis of the diaphragm valve may be inclined with respect to the vertical direction, and the holes may be positioned below the central axis of the diaphragm valve. In this case, it is preferable that the central axis of the diaphragm valve is inclined such that the pressure chamber side is higher.

[0068] Unlike Embodiment 2 described above, the central axis of the diaphragm valve may be inclined with respect to the vertical direction, the inlet of the back pressure path may be connected to the upper end of the pressure chamber at a position away from the diaphragm valve, and the outer circumferential surface between the diaphragm valve and the inlet of the back pressure path in the pressure chamber may extend upward from the diaphragm valve toward the inlet of the back pressure path. In this case, it is preferable that the central axis of the diaphragm valve is inclined such that the pressure chamber side is higher.

[0069] Unlike the embodiments described above, the external shape of the diaphragm valve when viewed from its central axis may be polygonal or elliptical. For a polygonal diaphragm valve, the center is assumed to be, for example, the position of the center of gravity, and the central axis of the polygonal diaphragm valve passes through this center and is perpendicular to the direction in which the diaphragm membrane expands. For an elliptical diaphragm valve, the center is the position where the major axis and minor axis intersect, and the central axis of the elliptical diaphragm valve passes through this center and is perpendicular to the direction in which the diaphragm membrane expands. [Explanation of Symbols]

[0070] 10,110,210: Diaphragm-type on / off valve, 11,111,211,311,411: Pressure chamber, 11A,211A,311A,411A: Upper surface of pressure chamber, 12,112,212: Back pressure path, 12A,112A,212A: Inlet, 14,114,214,314: Diaphragm valve, 14H,114H,214H: Hole, 15,115,215,315,415: Air accumulation prevention section, 30A: Upstream flow path, 100: Toilet device, 114J: Guide wall, C1: Center of diaphragm valve, Ca1: Central axis of diaphragm valve, R: Region, V1: First virtual line, V2: Second virtual line, V3: Third virtual line

Claims

1. A pressure chamber to which a back pressure path is connected, A diaphragm valve that closes the open end of the pressure chamber, A diaphragm-type on / off valve comprising: an air accumulation prevention unit that moves the air in the pressure chamber toward the back pressure path.

2. A diaphragm-type on / off valve according to claim 1, for use in a toilet device.

3. The diaphragm-type on / off valve according to claim 1, wherein the air accumulation prevention part has a wall surface forming the pressure chamber that extends upward toward the back pressure path.

4. The diaphragm valve has a hole formed through it that connects the pressure chamber and the flow path on the upstream side of the diaphragm valve. The diaphragm-type on / off valve according to claim 1, wherein, when viewed from the direction of movement of the diaphragm valve, the position of the hole and the position of the inlet of the back pressure path connected to the pressure chamber are misaligned.

5. When viewed from the aforementioned direction of movement, if a line passing through the center of the diaphragm valve and the hole is defined as the first virtual line, and a line passing through the center of the diaphragm valve and perpendicular to the first virtual line is defined as the second virtual line, The diaphragm-type on / off valve according to claim 4, wherein the opposing surface in the pressure chamber facing the diaphragm valve is inclined away from the diaphragm valve from the side where the hole is formed to the other side relative to the second virtual straight line, and the inlet of the back pressure path is located on the other side.

6. When viewed from the aforementioned direction of movement, if a line passing through the hole and perpendicular to the first virtual line is defined as the third virtual line, the region on the opposing surface opposite to the center of the diaphragm valve, with the third virtual line in between, extends upward toward the inlet of the back pressure path, according to claim 5.

7. The diaphragm valve has a hole formed through it that connects the pressure chamber and the flow path on the upstream side of the diaphragm valve. The diaphragm-type on / off valve according to claim 1, wherein the central axis of the diaphragm valve is either inclined with respect to the vertical direction or perpendicular to the vertical direction, and the hole is located below the central axis of the diaphragm valve.

8. The diaphragm-type on / off valve according to claim 1, wherein more than half of the area of ​​the opposing surface in the pressure chamber that faces the diaphragm valve extends upward.

9. The central axis of the diaphragm valve is either inclined with respect to the vertical direction or perpendicular to the vertical direction. The inlet of the back pressure path is connected to the upper end of the pressure chamber, which is located away from the diaphragm valve. The diaphragm-type on / off valve according to claim 1, wherein the surface between the diaphragm valve and the inlet of the back pressure path in the pressure chamber extends upward from the diaphragm valve toward the inlet of the back pressure path.

10. The diaphragm-type on / off valve according to claim 4, wherein the flow path area of ​​the hole gradually decreases toward the pressure chamber.

11. The diaphragm-type on / off valve according to claim 4, wherein a plurality of holes are formed.

12. The diaphragm-type on / off valve according to claim 1, wherein when the diaphragm valve moves into the pressure chamber, the diaphragm valve is in close contact with more than half of the wall surface of the pressure chamber.

13. The diaphragm valve has a hole formed through it that connects the pressure chamber and the flow path on the upstream side of the diaphragm valve. The diaphragm valve according to claim 1, wherein a guide wall is provided on the surface of the diaphragm valve facing the pressure chamber, so as to surround the hole.

14. A toilet device comprising a diaphragm-type on / off valve as described in any one of claims 1 to 13.

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