Water supply valve device

Abstract

To provide a feed water valve device capable of suppressing noise from being generated even if washing water flowing out of an on-off valve is discharged through a bent passage.SOLUTION: The present invention relates to a feed water valve device (1) that supplies washing water to a flush toilet bowl and that has: a feed water valve body (20); an inflow part (38) which is connected to a water supply pipe (8) to let washing water flow into the feed water valve body; an on-off valve which switches to discharge or stop the washing water flowing in the feed water valve body; an outflow passage (40) which is provided downstream from the on-off valve and extends to be bent substantially at right angles to an outflow direction from the on-off valve; and a pressure loss member (42) which is provided to the outflow passage and imparts pressure loss to a flow in the outflow passage to suppress separation of the flow.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a water supply valve device, and more particularly to a water supply valve device for supplying washing water to a flushing toilet.

Background Art

[0002] International Patent Application Publication No. WO2019 / 222744 (Patent Document 1) describes a fluid valve system. In this fluid valve system, the washing water flowing out horizontally from the fluid valve assembly is discharged downward through the outlet assembly. The discharged washing water is stored in the tank.

[0003] Japanese Patent No. 6002878 (Patent Document 2) describes a water supply valve for a toilet. In this water supply valve, the washing water supplied from the water supply pipe flows out horizontally through a water stop seat opened and closed by a tray (valve body), and is discharged from a downwardly directed water outlet pipe. The washing water discharged from the water supply valve flows into the water tank.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described in Patent Documents 1 and 2, the water supply valve device is often used by being disposed in a water storage tank, and usually, there are restrictions on the space for accommodating it. For this reason, it is often necessary to discharge the washing water that has passed through the on-off valve through a sharply bent passage. However, when the washing water that has passed through the on-off valve is made to flow into a sharply bent passage, there is a problem that abnormal noise is generated from the water supply valve device due to the separation of the flow of the washing water and the generation of vortices.

[0006] Accordingly, an object of the present invention is to provide a water supply valve device capable of suppressing the generation of abnormal noise even when the washing water flowing out from the on-off valve is discharged through a bent passage.

Means for Solving the Problems

[0007] In order to solve the above-described problems, the present invention is a water supply valve device for supplying washing water to a water flush toilet, including a water supply valve body, an inflow portion connected to a water supply pipe and allowing washing water to flow into the inside of the water supply valve body, an on-off valve for switching the discharge and stop of the washing water flowing into the water supply valve body, an outflow passage provided on the downstream side of the on-off valve and extending so as to bend substantially at a right angle with respect to the outflow direction from the on-off valve, and a pressure loss member provided in the outflow passage for imparting a pressure loss to the flow in the outflow passage and suppressing the separation of the flow.

[0008] In the present invention configured as described above, the discharge and stop of the washing water flowing into the water supply valve body from the water supply pipe through the inflow portion are switched by the on-off valve. The washing water discharged from the on-off valve flows into an outflow passage extending so as to bend substantially at a right angle with respect to the outflow direction from the on-off valve. The pressure loss member provided in the outflow passage imparts a pressure loss to the flow in the outflow passage and suppresses the separation of the flow.

[0009] According to the present invention configured as described above, since the pressure loss member imparts a pressure loss to the flow in the outflow passage to suppress the separation of the flow, it is possible to suppress the generation of abnormal noise due to the occurrence of separation in the flow in the outflow passage. That is, in recent years, from the viewpoint of effective utilization of the installation space, miniaturization has also been required for the water supply valve device. In order to house the water supply valve device in a narrow space, it may be necessary to sharply bend the passage connected to the downstream of the on-off valve. According to the present invention, even when the outflow passage is bent substantially at a right angle with respect to the outflow direction from the on-off valve, since the pressure loss member is provided in the outflow passage, it is possible to suppress the generation of abnormal noise caused by bending the outflow passage. Thereby, the water supply valve device can be easily miniaturized.

[0010] In the present invention, preferably, the outflow direction from the on-off valve is directed in a substantially horizontal direction, and the outflow passage extends by bending upward with respect to the outflow direction from the on-off valve.

[0011] It may be required to provide a predetermined air gap between the discharge port of the water supply valve device and the water surface of a tank or the like into which the discharged washing water flows. According to the present invention configured as described above, since the outflow passage extends by bending upward substantially at a right angle with respect to the outflow direction from the on-off valve, while achieving both miniaturization of the water supply valve device and suppression of abnormal noise, the discharge port of the water supply valve device can be provided at a high position, and a necessary air gap can be easily ensured.

[0012] In the present invention, preferably, the pressure loss member is provided inside the outflow passage and outside the range of the parallel projection line of the outflow port of the on-off valve. According to the present invention configured as described above, since the pressure loss member is provided outside the range of the parallel projection line of the outflow port of the on-off valve, the washing water flowing out from the outflow port once spreads over the entire flow path cross-section of the outflow passage and then flows into the flow path provided with the pressure loss member. For this reason, the flow of the washing water around the pressure loss member can be made more uniform, and the occurrence of separation can be effectively suppressed.

[0013] In the present invention, preferably, the pressure loss member is provided so as to extend in the longitudinal direction of the outflow passage so as to partition the flow passage in the outflow passage. According to the present invention configured as described above, since the pressure loss member is provided so as to extend in the longitudinal direction of the outflow passage so as to partition the flow passage in the outflow passage, it is possible to apply a pressure loss without greatly changing the flow direction of the washing water in the outflow passage. As a result, it is possible to suppress the generation of vortices and the like caused by providing the pressure loss member.

[0014] In the present invention, preferably, the pressure loss member has a cross-shaped cross-sectional shape so as to partition the flow passage in the outflow passage into four. According to the present invention configured as described above, since the pressure loss member has a cross-shaped cross-sectional shape, the flow in the outflow passage can be further subdivided and the flow velocity in the outflow passage can be made more uniform.

[0015] In the present invention, preferably, the pressure loss member is composed of a member separate from the outflow passage and is disposed in the outflow passage. According to the present invention configured as described above, since the pressure loss member is composed of a member separate from the outflow passage, the structure of the pressure loss member can be designed relatively freely regardless of the shape of the outflow passage, and a pressure loss member that can more effectively suppress abnormal noise can be designed.

Effect of the Invention

[0016] According to the water supply valve device of the present invention, even when the washing water flowing out from the on-off valve is discharged through the bent passage, the generation of abnormal noise can be suppressed.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0018] Next, with reference to the accompanying drawings, the water supply valve device according to the first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a washing water tank device equipped with a water supply valve device according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the entire water supply valve device according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of the main part of the water supply valve device according to the first embodiment of the present invention. FIG. 4 is an exploded perspective view showing the main components of the water supply valve device according to the first embodiment of the present invention disassembled. FIG. 5 is a perspective view showing the first main body member and the like constituting the water supply valve device according to the first embodiment of the present invention cut.

[0019] As shown in FIG. 1, the water supply valve device 1 according to the first embodiment of the present invention is a device provided inside the washing water tank device 2. The washing water tank device 2 includes the water supply valve device 1 according to the first embodiment of the present invention, a water storage tank 4 for storing the washing water supplied through the water supply valve device 1, and a drain valve device 6 for supplying the washing water stored in the water storage tank 4 to a flush toilet (not shown). Further, a water supply pipe 8 for supplying washing water to the water supply valve device 1 is connected to the water supply valve device 1.

[0020] In the present embodiment, the washing water tank device 2 is embedded in the wall surface of the toilet room and is a device for supplying washing water to a flush toilet (not shown). Further, the washing water tank device 2 is configured to open a drain valve (not shown) of the drain valve device 6 based on a washing operation of a user of the flush toilet, supply the washing water stored in the water storage tank 4 to the flush toilet, and wash it. The water supply valve device 1 of the present embodiment is configured to allow washing water to flow in from the water supply pipe 8 connected to the water supply when the washing water is used and the water level of the washing water stored in the water storage tank 4 drops, and discharge the washing water into the water storage tank 4 from the discharge port 10.

[0021] As shown in FIG. 2, the water supply valve device 1 includes a water supply valve unit 12, a float 14, an arm member 16 rotated by the float 14, and a vacuum breaker 18 attached to the downstream side of the water supply valve unit 12. As described below, the water supply valve unit 12 incorporates a diaphragm valve body as the main valve body, and is configured to switch the discharge and stop of the cleaning water supplied from the water supply pipe 8 by this diaphragm valve body.

[0022] The float 14 receives buoyancy from the cleaning water stored in the water storage tank 4 and is configured to be movable up and down according to the water level in the water storage tank 4. Further, a drive shaft 14a is attached to the float 14 so as to extend in the vertical direction, and this drive shaft 14a is connected to the arm member 16.

[0023] The arm member 16 is a generally U-shaped member arranged to straddle the water supply valve unit 12, and its middle part is rotatably supported by a support shaft 16a. One end of the arm member 16 is connected to the drive shaft 14a of the float 14. Further, a pilot valve body (not shown) is attached to the other end of the arm member 16, and this pilot valve body is configured to open and close a pilot valve port (not shown) provided in the water supply valve unit 12. With this configuration, when buoyancy acts on the float 14 and the drive shaft 14a is moved upward, the arm member 16 is rotated about the support shaft 16a, and the pilot valve body attached to the arm member 16 closes the pilot valve port. As described below, when the pilot valve port is closed, the diaphragm valve body incorporated in the water supply valve unit 12 is closed, and the discharge of the cleaning water from the water supply valve device 1 is stopped.

[0024] The vacuum breaker 18 is provided integrally with the water supply valve unit 12 on the downstream side of the water supply valve unit 12, and is configured such that the cleaning water flowing out from the water supply valve unit 12 flows in. The cleaning water flowing out from the water supply valve unit 12 passes through the vacuum breaker 18 and is discharged downward into the water storage tank 4 from the discharge port 10 (FIG. 1). Further, when the water supply valve unit 12 side becomes negative pressure, air is inhaled into the water supply valve unit 12 from the vacuum breaker 18, and it is configured to prevent the cleaning water from flowing back into the water supply valve unit 12.

[0025] Next, as shown in FIGS. 3 and 4, the water supply valve unit 12 has a water supply valve body 20, and this water supply valve body 20 is composed of a first body member 20a and a second body member 20b. The first body member 20a and the second body member 20b are watertightly joined to form the cylindrical water supply valve body 20. Further, an inflow portion 38 for connecting the water supply pipe 8 (FIG. 1) is provided at an end of the water supply valve body 20 on the side opposite to the vacuum breaker 18. Furthermore, inside the water supply valve body 20, a diaphragm valve assembly 22, a rectifying member 24 disposed upstream of the diaphragm valve assembly 22, and a strainer 26 disposed upstream of the rectifying member 24 are accommodated.

[0026] The strainer 26 is a cylindrical member provided with a large number of small holes, and is arranged such that the washing water flowing in from the inflow portion 38 flows into the interior. This strainer 26 prevents foreign matters and the like mixed in the tap water from flowing downstream.

[0027] As shown in FIG. 4, the rectifying member 24 is a member disposed downstream of the strainer 26, and is composed of a ring-shaped portion 24a located upstream, a donut plate-shaped portion 24b located downstream, and four blade-shaped portions 24c provided radially to connect these members. The washing water that has passed through the strainer 26 is rectified by the blade-shaped portions 24c and flows out downstream through the hole in the center of the donut plate-shaped portion 24b.

[0028] The diaphragm valve assembly 22 is disposed downstream of the rectifying member 24, and is configured to open and close a main valve port 28 (FIG. 3) provided in the first body member 20a by a diaphragm valve. Here, as shown in FIG. 3, the washing water that has passed through the rectifying member 24 reaches the main valve port 28 through the space between the outer periphery of the diaphragm valve assembly 22 and the inner wall surface of the first body member 20a. Also, a part of the washing water that has passed through the rectifying member 24 is configured to flow into the interior of the diaphragm valve assembly 22.

[0029] Furthermore, as shown in FIG. 3, the diaphragm valve assembly 22 includes a diaphragm valve body 30 that is the main valve body, a valve pressing member 32 that presses the diaphragm valve body 30, an assembly main body 34 that is attached to the upstream side of the valve pressing member 32, and a coil spring 36 that is disposed within the assembly main body 34.

[0030] The diaphragm valve body 30 is disposed so as to face the main valve port 28 (FIG. 5) provided within the first main body member 20a, and is moved so as to close or open the main valve port 28. This main valve port 28 is provided at the tip of a cylindrical portion provided inside the first main body member 20a. The washing water flowing in from the main valve port 28 flows out from the outlet 28a at the base end of the cylindrical portion. That is, when the diaphragm valve body 30 seats on the main valve port 28, the water discharge from the water supply valve device 1 stops, and when it separates from the main valve port 28, the washing water is discharged from the water supply valve device 1. Thus, in the present embodiment, the diaphragm valve body 30 and the main valve port 28 on which it seats function as an on-off valve, and the outlet 28a functions as the outlet of the on-off valve.

[0031] In the present embodiment, the washing water flows into the water supply valve device 1 in a substantially horizontal direction from the inflow portion 38, and the washing water that has passed through the main valve port 28 also flows out from the outlet 28a in a substantially horizontal direction that is the same as the inflow direction. Accordingly, in the present embodiment, the diaphragm valve body 30 is moved in a substantially horizontal direction that is the same as the inflow direction and the outflow direction from the outlet 28a.

[0032] The valve pressing member 32 is an annular member, and is configured to sandwich the peripheral edge portion of the diaphragm valve body 30 between it and the assembly main body 34 to fix the diaphragm valve body 30. Further, the downstream end portion of the valve pressing member 32 abuts against the inner wall surface of the first main body member 20a, and is configured to position the diaphragm valve assembly 22 at a predetermined position within the water supply valve main body 20.

[0033] The assembly body 34 is composed of a cylindrical portion 34a and a large-diameter portion 34b having a diameter larger than that of the cylindrical portion 34a. A part of the washing water that has passed through the rectifying member 24 flows into the diaphragm valve assembly 22 through an inlet 34c provided on the side surface of the cylindrical portion 34a (see the arrow of the two-dot chain line in FIG. 3). Further, a pressure chamber 22a is formed inside the diaphragm valve assembly 22 by the inner wall surface of the large-diameter portion 34b of the assembly body 34 and the back surface of the diaphragm valve body 30. The coil spring 36 is disposed in the pressure chamber 22a and is configured to bias the diaphragm valve body 30 toward the main valve port 28. Furthermore, the washing water that has flowed into the diaphragm valve assembly 22 from the inlet 34c increases the pressure in the pressure chamber 22a, and based on the force generated by this pressure, the diaphragm valve body 30 is pressed against the main valve port 28 to close the main valve port 28.

[0034] In addition, the assembly body 34 is provided with a pilot passage (not shown) that communicates the inside of the pressure chamber 22a with the outside of the diaphragm valve assembly 22. The pilot passage provided in the assembly body 34 is further configured to communicate with a pilot passage 20c (FIG. 5) provided in the first body member 20a. The pilot passage 20c communicates with a pilot valve port (not shown) provided on the outer wall surface of the first body member 20a, and this pilot valve port is opened and closed by a pilot valve (not shown) provided in the arm member 16 (FIG. 1).

[0035] With this configuration, when the pilot valve port (not shown) is closed by the pilot valve (not shown), the pressure inside the pressure chamber 22a in the diaphragm valve assembly 22 increases. On the other hand, when the pilot valve port is opened, the cleaning water in the pressure chamber 22a flows out to the outside through the pilot valve port, and the pressure in the pressure chamber 22a decreases. When the pressure in the pressure chamber 22a increases, the diaphragm valve body 30 that forms part of the pressure chamber 22a is pressed against the main valve port 28, and the main valve port 28 is closed. On the other hand, when the pressure in the pressure chamber 22a decreases, the cleaning water that has passed around the diaphragm valve assembly 22 separates the diaphragm valve body 30 from the main valve port 28 against the biasing force of the coil spring 36, and the main valve port 28 is opened (see the solid arrow in FIG. 3). Thus, the diaphragm valve body 30 built into the water supply valve unit 12 is opened and closed by opening and closing a pilot valve port (not shown) provided in the first main body member 20a.

[0036] Next, with reference to FIG. 5 newly, the configuration of the water supply valve unit 12 on the downstream side of the main valve port 28 will be described. FIG. 5 is a perspective view showing a part of the first main body member 20a and a part of the vacuum breaker 18 that form part of the water supply valve device 1, with a cutaway view.

[0037] As shown in FIG. 5, the main valve port 28 is formed by the tip of a cylindrical portion provided inside the first main body member 20a that constitutes the water supply valve body 20. In the present embodiment, the central axis of the cylindrical portion is generally directed in the horizontal direction, and when the main valve port 28 is opened by the diaphragm valve body 30, the cleaning water flows out generally horizontally from the outlet 28a at the downstream end of the cylindrical portion.

[0038] Furthermore, on the downstream side of the main valve port 28, an outflow passage 40 is provided so as to bend substantially at a right angle with respect to the outflow direction from the outflow port 28a. Thus, in the present embodiment, the outflow port 28a is directly connected to the outflow passage 40, and the outflow direction in which the washing water flows out from the outflow port 28a is directed in substantially the same horizontal direction as the inflow direction in which the washing water flows into the inflow portion 38. Further, the outflow passage 40 provided in the vicinity of the downstream side of the main valve port 28 extends upward so as to bend substantially at a right angle with respect to the outflow direction from the outflow port 28a. That is, in the present embodiment, the outflow passage 40 extends in the vicinity of the downstream side of the main valve port 28 so as to bend vertically upward. Here, the "bending" of the flow path means that the direction of the flow path changes without substantially providing an R-shaped curved flow path for changing the direction of the flow.

[0039] Also, the outflow passage 40 is a relatively narrow passage having a substantially rectangular cross section, and the cross-sectional area of the flow path is configured to be substantially constant. In the present embodiment, the cross-sectional areas of the main valve port 28 and the outflow port 28a are about 50 mm 2 whereas the cross-sectional area of the outflow passage 40 is about 44 mm 2

[0040] Furthermore, above the outflow passage 40, a passage having a large cross-sectional area of the flow path is connected, and this passage constitutes the upward passage 18a of the vacuum breaker 18. This upward passage 18a extends to the upper end of the first main body member 20a, and the upper end is open. Also, in the first main body member 20a, a downward passage 18b of the vacuum breaker 18 is provided so as to be adjacent to the upward passage 18a. The upper end of this downward passage 18b is also open, and the lower end thereof constitutes the discharge port 10 of the water supply valve device 1. Further, a cylindrical cap 18c is placed above the upward passage 18a and the downward passage 18b, covering the open upper ends of the upward passage 18a and the downward passage 18b.

[0041] ​The upward passage 18a, the downward passage 18b provided in the first main body member 20a, and the cap 18c covering them constitute the vacuum breaker 18. That is, the washing water flowing out from the main valve port 28 flows upward through the outflow passage 40 and into the upward passage 18a of the vacuum breaker 18. The washing water flowing into the upward passage 18a flows out from its upper end, passes through the inside of the cap 18c, and flows into the upper end of the downward passage 18b. The washing water flowing into the downward passage 18b flows out from the discharge port 10 at its lower end and into the water storage tank 4. Also, when the side of the main valve port 28 becomes negative pressure, air is inhaled from the gap between the first main body member 20a and the cap 18c, preventing the backflow of the washing water from the discharge port 10.

[0042] Furthermore, a pressure loss member 42 is attached inside the cap 18c so as to extend downward. This pressure loss member 42 extends downward from the ceiling surface inside the cap 18c into the upward passage 18a, and its lower end extends into the outflow passage 40. That is, the pressure loss member 42 extends in the longitudinal direction of the outflow passage 40 so as to partition the flow path in the outflow passage 40, and gives a pressure loss to the flow in the outflow passage 40 to suppress the separation of the flow. Also, as shown in FIG. 3, in this embodiment, the lower end of the pressure loss member 42 inserted into the outflow passage 40 from above is located at substantially the same height as the upper end of the outlet 28a. That is, in this embodiment, the pressure loss member 42 is provided at a position outside the parallel projection line in the outflow direction of the outlet 28a and substantially not intersecting the parallel projection line.

[0043] Also, the pressure loss member 42 is composed of a first plate-like portion 42a extending parallel to the plane of the drawing in FIG. 3 and a second plate-like portion 42b directed perpendicular to this, and is configured in a cross-sectional shape as a whole. Both ends of the first plate-like portion 42a are respectively in contact with a pair of opposing inner wall surfaces of the outflow passage 40, and both ends of the second plate-like portion 42b are respectively in contact with the other pair of opposing inner wall surfaces of the outflow passage 40. By arranging the pressure loss member 42 in this way, the flow path in the outflow passage 40 is narrowed and the flow path in the outflow passage is partitioned into four.

[0044] In the present embodiment, the pressure loss member 42 is arranged to contact each inner wall surface of the outflow passage 40. However, a gap may be provided between the pressure loss member 42 and the inner wall surface of the outflow passage 40, and the pressure loss member 42 can be configured such that the flow path in the outflow passage 40 is at least partially partitioned. Further, in the present embodiment, the cross-sectional area of the pressure loss member 42 in the direction orthogonal to the flow path is about 25 mm 2 and occupies about 57% of the flow path cross-sectional area of the outflow passage 40. Preferably, the pressure loss member 42 is configured such that the flow path cross-sectional area of the outflow passage 40 is reduced by about 40% to about 70% by providing the pressure loss member 42.

[0045] Next, with reference to FIGS. 6 to 8, the operation and effects of the pressure loss member 42 will be described. FIG. 6 shows a simulation result indicating the flow velocity distribution in the outflow passage 40 when the pressure loss member 42 is arranged, and FIG. 7 shows a simulation result indicating the flow velocity distribution in the outflow passage 40 when the pressure loss member 42 is not arranged as a comparative example. Further, FIG. 8 shows the experimental result of measuring the relationship between the flow pressure of the cleaning water flowing in the outflow passage 40 and the water supply sound generated from the water supply valve device 1.

[0046] As shown in FIG. 6, in the water supply valve device 1 of the present embodiment, the flow of the cleaning water flowing out horizontally from the outlet 28a bends substantially at a right angle and is directed upward by flowing into the outflow passage 40. The flow bent upward flows into the portion of the outflow passage 40 where the pressure loss member 42 is arranged and heads upward. At this time, the flow velocity of the cleaning water flowing in the outflow passage 40 is maintained relatively uniformly.

[0047] On the other hand, as a comparative example, as shown in FIG. 7, when the pressure loss member 42 is not disposed in the outflow passage 40, after flowing out from the outlet 28a, the flow bent at a right angle has a significantly reduced flow velocity in the outflow passage 40. Further, it can be seen that in the vicinity of the bent portion (the portion surrounded by the ellipse in FIG. 7) in the outflow passage 40, the flow velocity is extremely reduced and separation has occurred in the flow. In contrast, in the water supply valve device 1 of the present embodiment, even in the vicinity of the bent portion surrounded by the ellipse in FIG. 6, there is no extreme reduction in the flow velocity and no separation is observed. Thus, the present inventor has found that in a conventional water supply valve device in which no pressure loss member is disposed in the outflow passage, when an outflow passage bent at a substantially right angle is formed on the downstream side of the outlet, separation occurs in the flow and abnormal noise is generated. The present inventor has succeeded in suppressing the generation of abnormal noise by providing a pressure loss member in the outflow passage.

[0048] First, as shown by the solid line in FIG. 8, in the water supply valve device 1 of the first embodiment of the present invention, as the flow pressure of the cleaning water flowing in the outflow passage 40 increases, the water supply sound generated from the water supply valve device 1 gradually increases. That is, the water supply sound is about 36 dB at a flow pressure of 0.1 MPa, and the water supply sound gradually increases as the flow pressure increases, and the water supply sound rises to about 62 dB at a flow pressure of 1 MPa.

[0049] In contrast, as shown by the dotted line in FIG. 8, in the water supply valve device of the comparative example shown in FIG. 7, the water supply sound is about 43 dB at a flow pressure of 0.1 MPa, and the water supply sound gradually increases as the flow pressure increases. Further, when the flow pressure rises to about 0.55 MPa, the water supply sound rapidly increases, and the water supply sound rises to about 67 dB at a flow pressure of 1 MPa. That is, in the water supply valve device according to the comparative example shown by the dotted line in FIG. 8, it is considered that separation has occurred in the outflow passage when the flow pressure rises to about 0.55 MPa and the flow velocity increases. Thus, it is presumed that cavitation has occurred due to the separation in the flow in the outflow passage, and the water supply sound has rapidly increased.

[0050] As in the comparative example shown in FIG. 8, when the flow pressure increases and the water supply sound suddenly becomes loud, it is often recognized by the user as the generation of abnormal noise. On the other hand, in the water supply valve device 1 of the first embodiment of the present invention, although the water supply sound also increases as the flow pressure increases, the increase in the water supply sound is gentle and does not suddenly become large. Such a gentle increase in the water supply sound is usually not recognized by the user as the generation of abnormal noise.

[0051] Next, the operation of the washing water tank device 2 provided with the water supply valve device 1 according to the first embodiment of the present invention will be described. First, when the user performs a washing operation on a water-washed toilet (not shown), the drain valve (not shown) of the drain valve device 6 provided in the water storage tank 4 (FIG. 1) is opened, and the washing water stored in the water storage tank 4 is supplied to the water-washed toilet and is washed.

[0052] When the washing water stored in the water storage tank 4 is discharged, the water level in the water storage tank 4 drops, so the float 14 (FIG. 2) provided in the water supply valve device 1 drops. When the float 14 drops, the arm member 16 supporting the float 14 rotates about the support shaft 16a. As a result, a pilot valve body (not shown) provided on the arm member 16 separates from a pilot valve port (not shown) provided in the water supply valve unit 1, and the pressure in the pressure chamber 22a (FIG. 3) in the diaphragm valve assembly 22 communicating with the pilot valve port drops. When the pressure in the pressure chamber 22a drops, the pressure acting on the back side of the diaphragm valve body 30 drops, and the diaphragm valve body 30 separates from the main valve port 28. That is, the on-off valve constituted by the diaphragm valve body 30 and the main valve port 28 is opened.

[0053] When the on-off valve is opened, the cleaning water flowing into the water supply valve unit 12 from the water supply pipe 8 (Fig. 1) through the inflow portion 38 flows out from the outlet 28a of the on-off valve. The cleaning water flowing out from the outlet 28a flows into the upward passage 18a of the vacuum breaker 18 through the outflow passage 40 and is discharged from the discharge port 10 through the downward passage 18b. The cleaning water discharged from the discharge port 10 flows into the water storage tank 4 and raises the water level in the water storage tank 4. When the water level in the water storage tank 4 rises to a predetermined water stop level, the float 14 rises and rotates the arm member 16 to a predetermined position.

[0054] As a result, a pilot valve body (not shown) provided on the arm member 16 closes a pilot valve port (not shown). Thereby, the pressure in the pressure chamber 22a (Fig. 3) rises, the diaphragm valve body 30 seats on the main valve port 28, and the on-off valve is closed. As described above, the cleaning water tank device 2 returns to the initial state. In this embodiment, the discharge port 10 is located above the water stop level of the water storage tank 4, and there is always an air gap between the discharge port 10 and the water surface of the cleaning water in the water storage tank 4.

[0055] According to the water supply valve device 1 of the first embodiment of the present invention, since the pressure loss member 42 gives a pressure loss to the flow in the outflow passage 40 to suppress the separation of the flow, it is possible to suppress the generation of abnormal noise due to the separation of the flow in the outflow passage 40. That is, even when the outflow passage 40 is bent substantially at a right angle with respect to the outflow direction from the on-off valve, since the pressure loss member 42 is provided in the outflow passage 40, it is possible to suppress the generation of abnormal noise caused by bending the outflow passage 40. Thereby, the water supply valve device 1 can be easily miniaturized.

[0056] Further, according to the water supply valve device 1 of the present embodiment, since the outflow passage 40 is bent upward substantially at a right angle with respect to the outflow direction from the on-off valve and extends, while achieving both miniaturization of the water supply valve device 1 and suppression of abnormal noise, the discharge port 10 of the water supply valve device 1 can be provided at a high position, and a necessary air gap can be easily secured.

[0057] Furthermore, according to the water supply valve device 1 of the present embodiment, since the pressure loss member 42 is provided outside the range of the parallel projection line of the outlet 28a of the on-off valve, the cleaning water flowing out from the outlet 28a once spreads over the entire flow path cross section of the outflow passage 40 and then flows into the flow path where the pressure loss member 42 is provided. Therefore, the flow of the cleaning water around the pressure loss member 42 can be made more uniform, and the occurrence of peeling can be effectively suppressed.

[0058] Also, according to the water supply valve device 1 of the present embodiment, since the pressure loss member 42 is provided so as to extend in the longitudinal direction of the outflow passage 40 so as to partition the flow path in the outflow passage 40, a pressure loss can be given without greatly changing the flow direction of the cleaning water in the outflow passage 40. As a result, the generation of vortices and the like caused by the provision of the pressure loss member 42 can be suppressed.

[0059] Furthermore, according to the water supply valve device 1 of the present embodiment, since the pressure loss member 42 has a cross-shaped cross-sectional shape, the flow in the outflow passage 40 is further subdivided, and the flow velocity in the outflow passage 40 can be made more uniform.

[0060] Also, according to the water supply valve device 1 of the present embodiment, since the pressure loss member 42 is constituted by a member separate from the outflow passage 40, regardless of the shape of the outflow passage 40, the structure of the pressure loss member 42 can be designed relatively freely, and a pressure loss member 42 that can more effectively suppress abnormal noise can be designed.

[0061] Next, with reference to FIGS. 9 and 10, a water supply valve device according to a second embodiment of the present invention will be described. In the water supply valve device of the second embodiment of the present invention, the structure of the pressure loss member provided in the outflow passage is different from that of the first embodiment described above. Therefore, hereinafter, only the parts different from the first embodiment of the second embodiment of the present invention will be described, and the description of the same configuration, operation, and effects will be omitted. Also, for the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment will be given and the description will be omitted.

[0062] FIG. 9 is a perspective sectional view showing a part of the first main body member 120 used in the water supply valve device according to the second embodiment of the present invention. FIG. 10 is a sectional view of the first main body member 120 used in the water supply valve device according to the second embodiment of the present invention.

[0063] As shown in FIG. 9, in the water supply valve device of the present embodiment, a main valve port 28 is provided inside a first main body member 120 that constitutes a part of the water supply valve body of the water supply valve device. Further, an outflow passage 140 extending upward is provided on the downstream side of the main valve port 28. An upward passage 18a of the vacuum breaker 18 is connected to the upper end of this outflow passage 140, and a downward passage 18b is provided adjacent to the upward passage 18a. Also, a discharge port 10 is formed at the lower end of the downward passage 18b.

[0064] Furthermore, a pressure loss member 142 is provided integrally with the first main body member 120 inside the outflow passage 140. As shown in FIG. 10, this pressure loss member 142 is composed of a first plate-like portion 142a extending in a direction perpendicular to the plane of FIG. 10 and a second plate-like portion 142b directed at a right angle to the first plate-like portion 142a. That is, the first plate-like portion 142a extends in the outflow direction of the washing water from the main valve port 28 (outlet 28a) and partitions the outflow passage 140 into left and right in FIG. 10. Also, the second plate-like portion 142b extends in a direction parallel to the plane of FIG. 10 and partitions the outflow passage 140 in the depth direction of FIG. 10.

[0065] Also, in the present embodiment, the pressure loss member 142 extends from the lower end to the upper end of the outflow passage 140 and is also provided at a position intersecting the parallel projection line of the main valve port 28 (outlet 28a). Further, elongated rectangular openings are provided on both sides of the first plate-like portion 142a in the second plate-like portion 142b, and the front-side and back-side flow paths (the front-side and back-side flow paths in FIG. 10) of the second plate-like portion 142b are communicated. Thus, in the present embodiment, the flow path in the outflow passage 140 is partially partitioned by the pressure loss member 142.

[0066] Next, the measurement results of the water supply sound by the water supply valve device of the present embodiment are shown by the dashed line in FIG. 8. As shown by the dashed line in FIG. 8, in the water supply valve device of the present embodiment, the water supply sound gradually increases as the flow pressure increases, and the increase rate of the water supply sound becomes large when the flow pressure is about 0.7 MPa or more. In other words, according to the water supply valve device of the present embodiment, if it is used up to a flow pressure of about 0.7 MPa, the water supply sound can be sufficiently suppressed. Further, in the water supply valve device of the present embodiment, since the pressure loss member 142 is provided from the lower end of the outflow passage 140, it is integrated with the first main body member 120, and the pressure loss member 142 can be easily formed, and the number of parts can be reduced.

[0067] Next, with reference to FIG. 11, a water supply valve device according to a third embodiment of the present invention will be described. In the water supply valve device according to the third embodiment of the present invention, the structure of the pressure loss member provided in the outflow passage is different from that of the first embodiment described above. Therefore, hereinafter, only the parts different from the first embodiment of the third embodiment of the present invention will be described, and the description of the same configurations, operations, and effects will be omitted. Further, for the configurations similar to those of the first embodiment, the same reference numerals as those of the first embodiment will be given and the description will be omitted.

[0068] FIG. 11 is a perspective cross-sectional view showing a part of the first main body member 220 used in the water supply valve device according to the third embodiment of the present invention, with a part cut away. As shown in FIG. 11, in the water supply valve device of the present embodiment, a main valve port 28 is provided inside a first main body member 220 that constitutes a part of the water supply valve body of the water supply valve device. Further, an outflow passage 240 extending upward is provided on the downstream side of the main valve port 28. An upward passage 18a of the vacuum breaker 18 is connected to the upper end of the outflow passage 240, and a downward passage 18b is provided adjacent to the upward passage 18a. Further, a discharge port 10 is formed at the lower end of the downward passage 18b.

[0069] Furthermore, inside the outflow passage 240, a pressure loss member 242 is provided integrally with the first main body member 220. As shown in FIG. 11, this pressure loss member 242 is composed of a rectangular plate-like member extending upward from the lower end of the outflow passage 240. That is, the pressure loss member 242 is provided such that its plate surface faces the washing water flowing out from the main valve port 28 (outlet 28a).

[0070] Due to this pressure loss member 242, the outflow passage 240 is partitioned into a passage closer to the main valve port 28 and a passage farther away. Also, gaps are provided between both side edges of the pressure loss member 242 and the inner wall surface of the outflow passage 240, communicating the passage closer to the main valve port 28 and the passage farther away inside the outflow passage 240. Further, in the present embodiment, the pressure loss member 242 extends from the lower end of the outflow passage 240 to above the main valve port 28, and is also provided at a position intersecting the parallel projection line of the main valve port 28 (outlet 28a). Note that in the present embodiment, the pressure loss member 242 is provided only up to the middle of the outflow passage 240, and is not provided up to the downstream end (upper end) of the pressure loss member 242.

[0071] Next, the measurement results of the water supply sound by the water supply valve device of the present embodiment are shown by the two-dot chain line in FIG. 8. As shown by the two-dot chain line in FIG. 8, in the water supply valve device of the present embodiment, the water supply sound gradually increases as the flow pressure increases, and the increase rate of the water supply sound becomes large when the flow pressure is about 0.8 MPa or more. In other words, according to the water supply valve device of the present embodiment, if it is used up to a flow pressure of about 0.8 MPa, the water supply sound can be sufficiently suppressed. Also, in the water supply valve device of the present embodiment, since the pressure loss member 242 is provided from the lower end of the outflow passage 240, it can be integrally formed with the first main body member 220, and the pressure loss member 242 can be easily formed, reducing the number of parts. Further, the structure is simpler than the pressure loss member 142 in the second embodiment of the present invention, and the pressure loss member 242 can be easily molded integrally with the first main body member 220.

[0072] The embodiments of the present invention have been described above. However, various modifications can be made to the above-described embodiments. In particular, in the above-described embodiments, the washing water flowed in horizontally from the inflow portion and flowed out horizontally from the outflow port of the on-off valve constituted by the diaphragm valve body and the main valve port. Further, the diaphragm valve body was also moved in the same horizontal direction as the inflow direction and the outflow direction. However, in the present invention, these inflow direction, outflow direction, and the moving direction of the main valve body may be different from each other and may be directed in a direction other than the horizontal direction. Also, in the above-described embodiments, the outflow passage extended so as to bend vertically upward at a substantially right angle with respect to the outflow direction from the on-off valve, but the outflow passage can be directed in any direction.

Explanation of Signs

[0073] 1 Water supply valve device 2 Washing water tank device 4 Water storage tank 6 Drain valve device 8 Water supply pipe 10 Drain outlet 12 Water supply valve unit 14 Float 14a Drive shaft 16 Arm member 16a Support shaft 18 Vacuum breaker 18a Upward passage 18b Downward passage 18c Cap 20 Water supply valve body 20a First body member 20b Second body member 22 Diaphragm valve assembly 22a Pressure chamber 24 Rectifying member 24a Ring-shaped portion 24b Donut plate-shaped portion 24c Blade-shaped portion 26 Strainer 28 Main valve port 28a Outflow port 30 Diaphragm valve body (main valve body) 32 Clamp member 34 Assembly body 34a Cylindrical part 34b Large-diameter part 34c Inlet 36 Coil spring 38 Inlet part 40 Outflow passage 42 Pressure loss member 42a First plate-like part 42b Second plate-like part 120 First body member 140 Outflow passage 142 Pressure loss member 142a First plate-like part 142b Second plate-like part 220 First body member 240 Outflow passage 242 Pressure loss member

Claims

Claim 1 A water supply valve device for supplying washing water to a flushing toilet bowl, comprising: a water supply valve body; an inflow portion connected to a water supply pipe for allowing washing water to flow into the interior of the water supply valve body; a switching valve for switching the discharge and stop of the washing water flowing into the water supply valve body; an outflow passage provided downstream of the switching valve and extending so as to bend substantially at a right angle with respect to the outflow direction from the switching valve; a pressure loss member provided in the outflow passage for imparting a pressure loss to the flow in the outflow passage to suppress the separation of the flow; and wherein the outflow direction from the switching valve is directed substantially horizontally, and the outflow passage extends by bending upward with respect to the outflow direction from the switching valve. A water supply valve device characterized by this. Claim 2 The water supply valve device according to claim 1, wherein the pressure loss member is provided inside the outflow passage and outside the range of the parallel projection line of the outlet of the switching valve. Claim 3 The water supply valve device according to claim 1 or 2, wherein the pressure loss member is provided so as to extend in the longitudinal direction of the outflow passage so as to partition the flow path in the outflow passage. Claim 4 The water supply valve device according to claim 3, wherein the pressure loss member has a cross-sectional shape in a cross shape so as to partition the flow path in the outflow passage into four. Claim 5 The water supply valve device according to any one of claims 1 to 4, wherein the pressure loss member is composed of a member separate from the outflow passage and is disposed in the outflow passage.

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