Dispensing valve

Abstract

The invention provides a distribution valve which can restrain abrasion of a sealing component caused by a closing function. A distribution valve includes: a valve body having a first lead-out opening, a second lead-out opening, and a lead-in opening; a cylindrical valve body rotatably fitted into the valve body; and a drive mechanism that rotates the valve body, the valve body having a peripheral wall portion and a bottom surface portion, the peripheral wall portion having formed therein a first opening portion and a second opening portion that change the opening area of the first lead-out port and the second lead-out port by rotation of the valve body, and the bottom surface portion having formed therein a third opening portion that changes the opening area of the lead-in port by rotation of the valve body. The fluid from the inlet is distributed to the first outlet and the second outlet, in the distribution valve, a seal member having a lip portion in close contact with the bottom surface portion is fitted into the inlet, and the lip portion has a thickened portion. The thickened portion is thicker than the other portions of the portion facing the third opening portion immediately before the opening area of the introduction port becomes zero due to rotation of the valve body.

Description

Technical Field

[0001] The present invention relates to a distribution valve for controlling fluid distribution, and in particular to a distribution valve having a function of adjusting a fluid distribution ratio, a flow rate adjustment function for adjusting a total flow rate, and a closing function for reducing the total flow rate to zero. Background Art

[0002] Conventionally, for example, a hot water supply device utilizes a heating unit utilizing combustion heat to heat low-temperature tap water, and then mixes the heated high-temperature water with the tap water to adjust the temperature and supply hot water. The hot water supply device controls the heating capacity of the heating unit to adjust the temperature of the high-temperature water, and adjusts the mixing ratio of the high-temperature water to the tap water to adjust the temperature of the hot water supply.

[0003] For example, Patent Document 1 describes a mixing valve comprising a cylindrical valve body having an opening in its peripheral wall and an open bottom, and a valve body that rotatably houses the valve body. The valve body has an inlet for two fluids, such as water and hot water, formed at a portion corresponding to the peripheral wall of the valve body, and a discharge port formed at a portion corresponding to the bottom of the valve body.

[0004] The mixing valve disclosed in Patent Document 1 adjusts the mixing ratio of fluids introduced from the two inlets by changing the opening area of ​​the peripheral wall relative to the two inlets through rotation of the valve body. This mixing valve can be used in hot water supply devices to mix heated high-temperature water with unheated tap water.

[0005] Some hot water supply devices use a distribution valve to distribute tap water to a heating unit and a bypass passage that bypasses the heating unit. This system mixes the high-temperature water heated by the heating unit with the unheated tap water in the bypass passage to provide hot water. In these hot water supply devices, the mixing ratio of the high-temperature water and tap water is adjusted by adjusting the distribution ratio in the distribution valve. For example, the mixing valve disclosed in Patent Document 1 functions as a distribution valve by using the outlet port as the inlet port for tap water and the two inlet ports as the two outlet ports for tap water, thereby enabling the flow of fluids to be reversed.

[0006] In a hot water supply device with a distribution valve, when heating tap water at a low temperature of approximately 5°C to supply hot water at a high temperature of approximately 60°C, for example, the high hot water supply flow rate may result in insufficient heating capacity. In such cases, by supplying all the tap water to the heating unit and reducing the flow rate of tap water supplied to the hot water supply device, hot water at the set temperature can be supplied even though the total flow rate is reduced.

[0007] However, the mixing valve or the distribution valve that reverses the flow direction of the mixing valve in Patent Document 1 does not have a function for adjusting the total flow rate of the mixed hot water, nor a shutoff function for reducing the total flow rate to zero. Therefore, in hot water supply devices that use a mixing valve or a distribution valve to mix high-temperature water with low-temperature water, an on-off valve with a shutoff function is generally installed at the water supply port of the hot water supply device, and the total flow rate is adjusted by a flow control valve installed downstream of the mixing valve or the distribution valve.

[0008] Meanwhile, the present applicant has proposed a distributing valve with both flow adjustment and shutoff functions (e.g., Japanese Patent Application No. 2023-181621). This distributing valve comprises a cylindrical valve body, comprising a peripheral wall portion with openings corresponding to two outlets, and a bottom portion with an opening corresponding to the inlet. Furthermore, by rotating the valve body, the opening areas of the two outlets and the inlet are changed, thereby adjusting the distribution ratio and total flow rate, thereby achieving the functions of adjusting the distribution ratio, adjusting the flow rate, and shutoff.

[0009] At this time, in order to prevent leakage of the fluid, it is necessary to make the sealing member close to the bottom of the rotating valve body for sealing. The sealing member is formed into a cylindrical shape as the seal of Patent Document 2, and the tap water flowing in the cylindrical sealing member is introduced into the valve body from the opening of the bottom.

[0010] [Prior art literature]

[0011] [Patent Document]

[0012] [Patent Document 1] Japanese Patent No. 4933855

[0013] [Patent Document 2] Japanese Utility Model Application Laid-Open No. 02-031963 Summary of the Invention

[0014] [Problems to be solved by the invention]

[0015] However, the sealing member, which is in close contact with the bottom of the valve body, inevitably wears due to the rotation of the valve body. The closing function in particular sometimes accelerates this wear. Consequently, over time, a gap may form between the sealing member and the bottom, potentially reducing the closing function.

[0016] Therefore, an object of the present invention is to provide a distribution valve capable of suppressing wear of a sealing member caused by a closing function.

[0017] [Technical means to solve the problem]

[0018] The distributing valve of the invention of technical solution 1 includes: a valve body having a first guide outlet, a second guide outlet and an inlet; a cylindrical valve body that can be rotatably inserted into the valve body; and a driving mechanism that rotates the valve body via a valve shaft extending from the top surface of the valve body, the valve body having a peripheral wall portion that functions as a sealing surface portion that closes the first guide outlet and the second guide outlet, and a bottom surface portion that functions as a sealing surface portion that closes the inlet, and a gap is formed on the peripheral wall portion so that the opening area of ​​the first guide outlet and the opening area of ​​the second guide outlet are adjusted by the rotation of the valve body. The first opening portion and the second opening portion change continuously, and a third opening portion is formed on the bottom portion so that the opening area of ​​the inlet port changes within a specified range by the rotation of the valve body, and the fluid flowing from the inlet port into the valve body is distributed to the first outlet port and the second outlet port, wherein a sealing component having a lip portion for close contact with the bottom portion is inserted into the inlet port, and the lip portion has a thickened portion, and the thickened portion is formed to be thicker than other portions at a portion facing the third opening portion before the opening area of ​​the inlet port is about to become zero by the rotation of the valve body.

[0019] According to the structure, the distribution valve distributes the fluid introduced from the inlet into the cylindrical valve body to the first outlet and the second outlet. Then, the distribution ratio and the total flow rate are adjusted by rotating the valve body. A cylindrical sealing member that abuts against the bottom surface of the valve body is provided at the inlet. The sealing member has a lip portion that is in close contact with the bottom surface of the valve body, and in the lip portion, a portion facing the third opening of the valve body just before the opening area of ​​the inlet becomes zero is formed with a thickened portion that is thicker than other portions of the lip. Due to the increase in thickness, the thickened portion is difficult to deform while maintaining the sealing performance. Therefore, when the valve body is rotated to reduce the opening area of ​​the inlet, it is difficult to be drawn into the third opening, and the wear caused by the closing function can be suppressed. In addition, due to the increase in thickness, the amount of wear allowed to maintain the sealing performance increases, and the durability of the distribution valve is improved.

[0020] The distributing valve of the invention according to claim 2 is the invention according to claim 1 , wherein the sealing member is configured to be movable in the axial direction of the valve body and to be pressed toward the valve body by the supply pressure of the fluid acting on the inlet, and the lip portion is in close contact with the bottom portion.

[0021] According to the above structure, the sealing member moves toward the valve body under the supply pressure of the fluid, so that the lip portion is in close contact with the bottom surface of the valve body. Therefore, even if the lip portion is worn, the lip portion and the bottom surface portion can be kept in close contact, thereby improving the durability of the distribution valve.

[0022] The distributing valve of the invention according to claim 3 is the invention according to claim 1 or 2, wherein the bottom portion has a horizontal strip extending in the circumferential direction to divide the third opening so as to abut against the thickened portion when the opening area of ​​the introduction port is minimized.

[0023] With this structure, when the opening area of ​​the inlet port is reduced by rotation of the valve body, the thickened portion is easily drawn into the third opening by the fluid flowing into the third opening. However, the horizontal bar extending circumferentially along the third opening prevents this from being drawn into the third opening. Therefore, when the valve body is rotated to reduce the opening area of ​​the inlet port, the thickened portion of the lip is less likely to be drawn into the third opening, thereby reducing wear on the lip.

[0024] [Effects of the Invention]

[0025] According to the distributing valve of the present invention, wear of the sealing member caused by the closing function can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a structural diagram of a hot water supply device including a distribution valve according to an embodiment of the present invention.

[0027] Figure 2 It is a perspective view of a distribution valve according to an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 Exploded view of the main parts of the distribution valve.

[0029] Figure 4 yes Figure 2 A longitudinal sectional view of the distributing valve taken along line IV-IV.

[0030] Figure 5 This is an exploded view of the valve body.

[0031] Figure 6 It is a plan view of the sealing component.

[0032] Figure 7 yes Figure 6 VII-VII line cross-sectional view of the valve seat component.

[0033] Figure 8 Yes Figure 2 FIG. 1 is a diagram of an initial state of a first outlet of a distributing valve.

[0034] Figure 9 Yes Figure 2 FIG. 1 is a diagram showing the initial state of the second outlet of the distributing valve.

[0035] Figure 10 Yes Figure 2 Diagram of the initial state of the inlet port of the distribution valve.

[0036] Figure 11 Yes Figure 2 A diagram showing the state of the inlet of the distribution valve just before it is closed.

[0037] Figure 12 It is a perspective view showing another example of the sealing member.

[0038] Explanation of Figure Numbers

[0039] 1: Hot water supply device

[0040] 3: Heat exchanger

[0041] 4: Water supply access

[0042] 5: Hot water outflow passage

[0043] 6: Bypass path

[0044] 7: Control mechanism

[0045] 10: Distribution valve

[0046] 11: Valve body

[0047] 12: Drive unit (drive mechanism)

[0048] 13: First export outlet

[0049] 14: Second export outlet

[0050] 15: Import port

[0051] 16: Mounting plate

[0052] 20: Valve body

[0053] 21: First valve body

[0054] 21a: Top face

[0055] 21b: Peripheral wall

[0056] 22: Valve shaft

[0057] 23: First opening

[0058] 24: Second opening

[0059] 26: Second valve body

[0060] 26a: bottom part

[0061] 26c, 26d: horizontal stripes

[0062] 27: The third opening

[0063] 30: Collar component

[0064] 40: Sealing components

[0065] 41: Cylindrical part

[0066] 42: Top face

[0067] 43: Lips

[0068] 43a: convex part

[0069] 43b: thickening

[0070] 44: Slot DETAILED DESCRIPTION

[0071] Hereinafter, modes for carrying out the present invention will be described based on examples.

[0072] [Example]

[0073] First, a hot water supply device to which the distribution valve of the present invention is applicable will be described.

[0074] like Figure 1 As shown, a hot water supply device 1 is a combustion-type hot water supply device. It includes a combustion device 2, which includes a burner and a blower fan, and a heat exchanger 3. The device also includes a heating unit that uses the combustion heat generated by the combustion device 2 to heat tap water in the heat exchanger 3. The hot water supply device 1 comprises a water supply passage 4 that supplies tap water to the heat exchanger 3, a hot water outflow passage 5 that allows hot water from the heat exchanger 3 to flow out, a distribution valve 10 inserted into the water supply passage 4, a bypass passage 6 that branches from the water supply passage 4 in the distribution valve 10 and connects to the hot water outflow passage 5, and a control mechanism 7 for controlling the hot water supply. The distribution valve 10 distributes the supplied tap water between the heat exchanger 3 and the bypass passage 6 that bypasses the heating unit. The heat exchanger 3 includes a latent heat recovery heat exchanger. The hot water supply device 1 is equipped with a neutralizer 9 that neutralizes and discharges the strongly acidic drain water (drain water) formed by condensation of water contained in the combustion exhaust gas.

[0075] A hot water supply temperature sensor 8a is provided in the hot water outflow passage 5, downstream of the connection with the bypass passage 6. A water supply temperature sensor 8b and a water supply flow rate sensor 8c are provided in the water supply passage 4, downstream of the distribution valve 10. The control mechanism 7 controls the amount of heat generated by the combustion device 2 based on the temperature detected by the water supply temperature sensor 8b and the flow rate detected by the water supply flow rate sensor 8c, and also controls the distribution ratio of the distribution valve 10 so that the temperature detected by the hot water supply temperature sensor 8a reaches the set hot water supply set temperature. The flow rate (total flow rate) of tap water introduced into the hot water supply device 1 is calculated based on the flow rate detected by the water supply flow rate sensor 8c and the distribution ratio of the distribution valve 10.

[0076] The distribution valve 10 is controlled so that the greater the heating capacity required for hot water supply at the hot water supply set temperature, the greater the distribution ratio toward the heat exchanger 3. In addition, the distribution valve 10 is controlled so that the total flow rate is reduced or zero as needed.

[0077] Next, the distribution valve 10 will be described.

[0078] like Figure 2 As shown, the distribution valve 10 includes a valve body 11 and a drive unit (drive mechanism) 12, such as a stepping motor. Here, the distribution valve 10 is described as being mounted on the hot water supply device 1 with the drive unit 12 facing upward. Arrows U, F, and L in the figure indicate the upward, forward, and left directions of the distribution valve 10, respectively. The orientation of the distribution valve 10 can be modified as appropriate depending on the device in which it is installed.

[0079] The valve body 11 is formed of, for example, a synthetic resin and has a first outlet 13 and a second outlet 14 on the side surface, and an inlet 15 on the bottom surface. The drive unit 12 is fixed to a mounting plate 16 on the upper portion of the valve body 11 by a plurality of fastening members 17. In the distribution valve 10, the inlet 15 and the second outlet 14 are connected to the water supply passage 4 and inserted into the water supply passage 4. The bypass passage 6 is connected to the first outlet 13. The tap water indicated by the arrow WI introduced upward into the inlet 15 is distributed as follows: tap water supplied from the first outlet 13 to the bypass passage 6, as indicated by the arrow WO1, and tap water supplied from the second outlet 14 to the heat exchanger 3, as indicated by the arrow WO2.

[0080] like Figure 3 、 Figure 4 As shown, a cylindrical valve body 20 formed of, for example, a synthetic resin is rotatably inserted into a cylindrical space formed inside the valve body 11. A valve shaft 22 having a central axis C common to the valve body 20 extends from a top surface portion 21a covering the top surface of the valve body 20 to the outside of the valve body 11. A collar member 30 that supports the valve shaft 22 so as to be rotatable is inserted into the valve body 11 together with the valve body 20. These valve bodies 20 and collar members 30 are fixed to the mounting plate 16 of the valve body 11 by a plurality of fastening members 18 to prevent them from falling off the valve body 11. In order to rotationally drive the valve body 20 via the valve shaft 22 by the drive unit 12 fixed to the mounting plate 16, a portion of the valve shaft 22 is serrated. In addition, the internal structure of the drive unit 12 is omitted from illustration and description.

[0081] Two O-rings 22a are mounted on the valve shaft 22 to provide a watertight seal with the collar member 30. An O-ring 30a is also mounted on the outer periphery of the collar member 30 to provide a watertight seal with the valve body 11. A rotation restrictor 33 is formed on the insertion portion 32 of the collar member 30, which is inserted into the mounting plate 16. This portion engages with the mounting plate 16 to prevent the collar member 30 from rotating with the rotation of the valve body 11.

[0082] Next, the valve body 20 will be described.

[0083] like Figure 3 、 Figure 5 As shown, the valve body 20 is formed by fitting a disc-shaped second valve body 26 having a bottom portion 26a into the open end of a first valve body 21 having a cylindrical peripheral wall portion 21b and a top portion 21a. Multiple key grooves 21c are formed on the inner wall of the peripheral wall portion 21b at the open end. Multiple keys 26b are formed on the second valve body 26, corresponding to the multiple key grooves 21c of the first valve body 21.

[0084] The plurality of keys 26b corresponding to the plurality of key grooves 21c prevent relative rotation between the first valve body 21 and the second valve body 26, while also providing circumferential positioning, allowing the first valve body 21 and the second valve body 26 to rotate integrally. The peripheral wall portion 21b slides against the inner circumference of the side surfaces surrounding the cylindrical space within the valve body 11, functioning as a sealing surface that closes the first and second outlet ports 13, 14 of the valve body 11. The bottom portion 26a also functions as a sealing surface that closes the inlet port 15 of the valve body 11.

[0085] The first valve body 21 has a first opening 23 on the upper side (top surface 21a side) of the peripheral wall 21b for communicating the interior space of the valve body 20 with the first outlet 13. The first valve body 21 has a second opening 24 on the lower side (open end side) of the peripheral wall 21b for communicating the interior space of the valve body 20 with the second outlet 14. The first opening 23 and the second opening 24 are formed so that their axial opening widths (heights) change as they move circumferentially. Furthermore, the first valve body 21 has a plurality of reinforcing ribs 21d formed in a manner that protrudes into the interior space, reinforcing the peripheral wall 21b and top surface 21a. These reinforcing ribs 21d suppress radial and axial deformation of the first valve body 21.

[0086] The second valve body 26 has a third opening 27 for connecting the interior space of the valve body 20 with the inlet 15. The third opening 27 is divided into a large opening 27a and a small opening by a transverse bar 26c extending radially along the bottom portion 26a. The small opening is divided into a small opening 27b and a small opening 27c by a transverse bar 26d extending circumferentially. The bottom portion 26a comprises an annular outer portion, a fan-shaped portion connecting the annular outer portion and its central portion, and transverse bars 26c and 26d. The bottom portion 26a occupies approximately half of the axially projected area of ​​the valve body 20. To prevent deformation (axial displacement) of the bottom portion 26a, a plurality of reinforcing ribs 26e are radially formed on the side of the bottom portion 26a facing the interior space of the valve body 20, connecting the annular outer portion and its central portion.

[0087] Next, the sealing member 40 will be described.

[0088] like Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 As shown, a sealing member 40 formed into a cylindrical shape from an elastic material, such as a fluorine-based synthetic resin, is inserted into the communicating portion 15a of the inlet 15 at the bottom of the valve body 11 at the inlet 15. The sealing member 40 includes a cylindrical portion 41 formed to abut against the inner wall of the inlet 15, a top portion 42, and a lip portion 43 extending from the top portion 42 toward the valve body 20 and sealing by abutting against the bottom portion 26a of the valve body 20. A groove 44 is formed along the base end of the lip portion 43 on the top portion 42, surrounding the outer circumference of the lip portion 43.

[0089] The lip portion 43 is formed into a cylindrical shape with an opening shape that is roughly fan-shaped. The inlet 15 and the internal space of the cylindrical valve body 20 can be connected through the inner side of the cylindrical lip portion 43 and the inner side of the cylindrical portion 41. In addition, a convex portion 43a protruding outward is formed on the lip portion 43 so as to surround the outer circumference of the lip portion 43. The sealing member 40 inserted into the connecting portion 15a can at least move in the axial direction of the valve body 20 while the convex portion 43a is in close contact with the inner wall of the connecting portion 15a to prevent it from falling off. In addition, the sealing member 40 is pushed by the supply pressure of the fluid supplied to the inlet 15, so that the lip portion 43 and the groove 44 are in close contact with the connecting portion 15a, and the top surface portion 42 is in close contact with the bottom of the valve body 11 in the inlet 15, so that sealing can be performed.

[0090] A thickened portion 43b is formed on the lip portion 43 at a portion of the front end that contacts the bottom portion 26a of the valve body 20. The thickened portion 43b has a greater cylindrical thickness than the rest of the lip portion 43. When the opening area of ​​the inlet 15 is set to zero (immediately before closure), the portion facing the third opening 27 of the bottom portion 26a protrudes inwardly from the cylindrical lip portion 43. Furthermore, the thickened portion 43b is formed so that, at the position of contact with the bottom portion 26a when the inlet 15 is closed, it becomes thicker toward the radially outer circumference of the bottom portion 26a. The portion that is more susceptible to wear becomes thicker to prevent fluid flow from being obstructed.

[0091] like Figure 8 As shown, the first outlet 13 is connected to the inner space of the valve body 20 via the communication portion 13a having a semicircular opening with a straight lower end and the first opening 23 of the valve body 20. Figure 9 As shown, the second guide port 14 communicates with the inner space of the valve body 20 via the communicating portion 14a having a semicircular opening with a straight upper end and the second opening 24 of the valve body 20. Figure 10 As shown, the introduction port 15 provided with the sealing member 40 communicates with the internal space of the valve body 20 via the inner side of the cylindrical portion 41 and the inner side of the fan-shaped lip portion 43 of the sealing member 40 and the third opening 27 of the valve body 20 .

[0092] The opening area of ​​the first opening 23 communicating with the first outlet 13 (the opening area of ​​the first outlet 13), the opening area of ​​the second opening 24 communicating with the second outlet 14 (the opening area of ​​the second outlet 14), and the opening area of ​​the third opening 27 communicating with the inlet 15 (the opening area of ​​the inlet 15) are changed within a predetermined range by the rotation of the valve body 20. Figure 8 、 Figure 9 As shown, the opening area of ​​the first outlet 13 is the largest, the opening area of ​​the second outlet 14 is the smallest, and as shown Figure 10 The illustrated state of the opening area of ​​the inlet 15 being substantially fully open assumes the initial state in which the rotation angle of the valve body 20 is 0 degrees. Furthermore, the prescribed range is from the maximum to zero (closed) in the inlet 15, and from the non-zero minimum to the maximum in the first and second outlet ports 13, 14. However, when the inlet 15 is closed, the first and second outlet ports 13, 14 may also be closed.

[0093] When the valve body 20 is rotated clockwise (clockwise when viewed from above) in its initial state, the opening areas of the first and second outlet ports 13, 14 change, and the opening area of ​​the inlet port 15 also changes. Thus, by rotating the valve body 20, the distribution ratio and the total flow rate can be adjusted according to the rotation angle of the valve body 20. The rotation angle of the valve body 20 is, for example, between 0 and 270 degrees, and does not complete a single rotation.

[0094] When the valve body 20 is further rotated to the right, the opening area of ​​the inlet 15 becomes smaller, and finally the inlet 15 is closed at a rotation angle of, for example, 240 degrees, and the total flow rate is zero. At this time, the sealing member 40 is pressed toward the valve body 20 by the supply pressure of the tap water supplied to the inlet 15, and the front end side of the lip 43 is in close contact with the bottom surface 26a. Figure 11 As shown, when the opening area of ​​the introduction port 15 is zero (immediately before closing), the thickened portion 43b formed on the lip 43 faces the third opening 27, and the other portion of the lip 43 abuts against the bottom surface 26a.

[0095] Just before the inlet 15 is closed, the sealing member 40 is subjected to a force from the fluid toward the valve body 20, causing the tip of the lip 43 to slightly elastically deform and come into close contact with the bottom surface portion 26a. A portion of the lip 43 is slightly drawn into the opening 27 (large opening 27a, small opening 27b, or small opening 27c). By reducing the opening area of ​​the inlet 15 while the lip 43 partially enters the opening 27, the lip 43 is drawn into the smaller opening 27, accelerating wear. However, since the thickened portion 43b is formed on the portion facing the opening 27 just before the inlet 15 is closed, the thickened portion 43b is less likely to enter the opening 27 and be drawn into the smaller opening 27, thereby suppressing wear of the lip 43.

[0096] Figure 12 FIG2 shows an example of a sealing member 40 in which the lip portion 43 is modified. The front end portion of the cylindrical lip portion 43 protrudes inward as a whole and is formed to be thicker than the base end side. In addition, a double annular convex portion 43c and annular convex portion 43d are formed at the front end thereof, protruding toward the bottom surface portion 26a. As described above, while the front end side of the lip portion 43 is thickened to suppress wear, the double annular convex portion 43c and annular convex portion 43d are formed to reduce frictional resistance with the bottom surface portion 26a. Although not shown in the figure, in order to strengthen the double annular convex portion 43c and annular convex portion 43d, a plurality of connecting portions connecting the inner annular convex portion 43c and the outer annular convex portion 43d can also be formed at appropriate intervals.

[0097] The function and effect of the distribution valve 10 will be described.

[0098] The distribution valve 10 distributes the fluid introduced into the cylindrical valve body 20 from the inlet 15 to the first outlet 13 and the second outlet 14. The distribution ratio and total flow rate are then adjusted by rotating the valve body 20. A cylindrical sealing member 40 is provided at the inlet 15, abutting the bottom portion 26a of the valve body 20. The sealing member 40 includes a lip 43 that contacts the bottom portion 26a of the valve body 20. The portion of the lip 43 that faces the third opening 27 of the valve body 20 when the opening area of ​​the inlet 15 is minimized has a thickened portion 43b that is thicker than the rest of the lip 43. This increased thickness makes the thickened portion 43b less likely to deform while maintaining sealing performance. Therefore, when the valve body 20 is rotated to reduce the opening area of ​​the inlet 15, the thickened portion 43b is less likely to become entangled in the third opening 27, thereby suppressing wear of the lip 43 caused by the closing function. Furthermore, due to the increased thickness, the amount of wear allowed to maintain sealing performance increases, thereby improving the durability of the distribution valve 10 .

[0099] The sealing member 40 is moved toward the valve body 20 by the supply pressure of the fluid, and the lip portion 43 is in close contact with the bottom portion 26a of the valve body 20. Therefore, even if the lip portion 43 wears, the sealing member 40 is pressed toward the bottom portion 26a of the valve body 20, so that the lip portion 43 and the bottom portion 26a can be in close contact, thereby improving the durability of the dispensing valve 10.

[0100] The bottom portion 26a includes a horizontal bar 26d extending circumferentially to divide the third opening 27. This bar abuts against the thickened portion 43b just before the opening area of ​​the inlet 15 reaches zero and is closed. When the opening area of ​​the inlet 15 decreases due to rotation of the valve body 20, the thickened portion 43b is easily drawn into the third opening 27 by the fluid flowing into the third opening 27. However, the horizontal bar 26d extending circumferentially along the third opening 27 prevents this from happening. Therefore, when the valve body 20 rotates to close the inlet 15, the thickened portion 43b of the lip 43 is less likely to become entangled in the third opening 27, thus minimizing wear of the lip 43.

[0101] The distribution valve 10 can also be applied to devices other than the hot water supply device 1, and the fluid can also be a fluid other than tap water. In addition, those skilled in the art can implement various modifications to the above embodiment without departing from the spirit of the present invention, and the present invention includes such modifications.

Claims

1. A dispensing valve comprising: The valve body has a first outlet, a second outlet, and an inlet; A cylindrical valve body rotatably inserted into the valve body; The closure of the valve body is closed by the closure of the valve core, and the closure of the valve core is closed by the closure of the valve core. A sealing member having a lip portion for close contact with the bottom portion is inserted into the introduction port. The lip portion includes a thickened portion, wherein a portion of the thickened portion facing the third opening immediately before the opening area of ​​the introduction port becomes zero due to rotation of the valve body is formed thicker than other portions.

2. The dispensing valve according to claim 1, characterized in that The sealing member is configured to be movable in the axial direction of the valve body and to be pressed toward the valve body by the supply pressure of the fluid acting on the introduction port, and the lip portion is in close contact with the bottom surface portion.

3. The distributing valve according to claim 1 or 2, characterized in that: The bottom surface portion has a horizontal stripe extending in the circumferential direction so as to divide the third opening portion so as to abut against the thickened portion when the opening area of ​​the introduction port is minimized.

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