Water dispenser

Abstract

To provide a water server capable of reducing a possibility that a sealing capability of a valve mechanism when a valve is closed becomes deteriorated due to deposition of minerals.SOLUTION: The water server comprises: a drinking water tank; a drinking water channel including first and second inclined channels R41 and R42 and an extension channel R43; and first and second electromagnetic valves V1 and V2 that constitute a portion of the drinking water channel on an upstream of the first and second inclined channels R41 and R42, and include valve bodies V11 and V21, valve seats V12 and V22 and valve channels V13 and V23. Mesh members M1 and N1 formed in a mesh-shape are arranged within a region from the valve seats V12 and V22 to a downstream end of the inclined channels R41 and R42.SELECTED DRAWING: Figure 3

Description

Technical Field

[0006] ,

[0001] The present invention relates to a water server.

Background Art

[0002] Conventionally, a beverage extraction device has been disclosed that includes a hot water tank, a pipe through which the hot water in the hot water tank flows, a valve provided in the middle of the pipe, and a water supply part provided at the lower end of the pipe and having a plurality of holes (see, for example, Patent Document 1). Among these, the pipe has a vertical flow path that extends vertically downward from the valve, an inclined flow path that inclines obliquely downward from the lower end of the vertical flow path, and an extended flow path that extends from the lower end of the inclined flow path.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the invention described in Patent Document 1, when the valve opens, the drinking water flows in the inclined flow path, and with the momentum of the flow, it jumps over the inner surface closer to the inclined flow path in the extended flow path and easily flows along the inner surface farther from the inclined flow path in the extended flow path. At this time, air may enter from the outside to the inner surface side closer to the inclined flow path in the extended flow path. <​​​​​​This invention was made to solve the aforementioned conventional problems, and its objective is to provide a water dispenser that can reduce the possibility of a decrease in the sealing performance of the valve mechanism when the valve is closed due to mineral precipitation. [Means for solving the problem]

[0007] The water server according to the present invention comprises a drinking water tank for storing drinking water, a drinking water channel having an inclined channel that slopes diagonally downward downstream from the drinking water tank, and an extended channel that extends downstream in connection with the inclined channel and has a water outlet for dispensing drinking water, and a valve mechanism that forms part of the drinking water channel upstream of the inclined channel and has a valve body, a valve seat on which the valve body can move toward and away from, and a valve channel continuous with the valve seat, and opens and closes the drinking water channel, wherein a mesh member formed in a mesh shape is arranged in the region from the valve seat to the downstream end of the inclined channel. The valve passage and the inclined passage have different directions of flow for drinking water, the valve body is removable, and with the valve body removed, the point where the direction of flow of drinking water changes is visible, the mesh member is positioned including the point of change, and the valve passage has an inner wall that tapers towards the downstream and has a tapered inner wall portion that sandwiches the mesh member. It is characterized by the following. [Effects of the Invention]

[0008] According to the present invention, the possibility of a decrease in the sealing performance of the valve mechanism when the valve is closed due to mineral precipitation is reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing a water server according to an embodiment of the present invention. [Figure 2] Figure 1 is a diagram showing the internal layout of the water dispenser. [Figure 3] Figure 2 is a schematic diagram of the solenoid valve mechanism. [Figure 4] (a) is a plan view from above of the configuration of the first solenoid valve with the valve body removed. (b) is a cross-sectional view along line AA of (a). (c) is a plan view from above of the configuration of the second solenoid valve with the valve body removed. (d) is a cross-sectional view along line BB of (c). [Figure 5] This is a schematic diagram of the solenoid valve mechanism when the second solenoid valve is open. [Figure 6] This is a schematic diagram of a modified solenoid valve mechanism. [Modes for carrying out the invention]

[0010] The present invention will be described below in accordance with preferred embodiments. It should be noted that the present invention is not limited to the embodiments shown below, and can be modified as appropriate without departing from the spirit of the invention. Furthermore, in the embodiments shown below, some illustrations and descriptions of certain components are omitted. It goes without saying that, regarding the details of the omitted technologies, publicly known or well-known technologies are applied as appropriate, to the extent that they do not contradict the content described below.

[0011] Figure 1 is a perspective view showing a water server 1 according to an embodiment of the present invention. The water server 1 shown in Figure 1 has a housing 10 that is roughly rectangular in shape when viewed externally as a prism, and a water outlet 21 (a part of the leading edge of the extended flow path R43 described later) and an operation panel 30 are provided on the front side of this housing 10. In such a water server 1, a drinking water bottle B (drinking water tank) is placed on top of the housing 10. Note that the drinking water bottle B is not limited to the top of the housing 10, but may also be built into the bottom.

[0012] The water outlet unit 21 is a cylindrical member that dispenses drinking water in response to user operations on the control panel 30. At least a portion of the water outlet unit 21 is housed in a recess 11 formed to curve inward from the front to the rear of the housing 10. The control panel 30 is an operating unit that receives operations from the user and allows for various operations, such as dispensing cold water (water at a temperature below a first predetermined temperature (e.g., 20°C)), dispensing hot water (water at a temperature of a second predetermined temperature (e.g., 40°C) or higher), and heating hot water.

[0013] Figure 2 is a schematic diagram showing the internal structure of the water dispenser 1 shown in Figure 1. As shown in Figure 2, the water dispenser 1 is equipped with a cold water tank T1 (drinking water tank) and a hot water tank T2 (drinking water tank) inside the housing 10 (see Figure 1). Furthermore, the water dispenser 1 is equipped with first to third flow paths R1 to R3 (drinking water flow paths) and a solenoid valve mechanism 40.

[0014] The chilled water tank T1 is a tank that receives and stores drinking water from the drinking water bottle B. The chilled water tank T1 is equipped with a cooler G, and the room temperature drinking water introduced into the chilled water tank T1 is cooled by the cooler G to become chilled water. The chilled water tank T1 has a partition plate 20 that divides the inside into upper and lower sections. The partition plate 20 divides the drinking water inside the chilled water tank T1 into an upper layer (room temperature water) that is not easily cooled by the cooler G and a lower layer (chilled water) that is cooled by the cooler G. Room temperature water is water that is above a first predetermined temperature and below a second predetermined temperature. The chilled water tank T1 is also connected to the drinking water bottle B by a water conduit C. The drinking water from the drinking water bottle B is introduced into the chilled water tank T1 through the water conduit C.

[0015] The hot water tank T2 is connected to the lower part of the cold water tank T1 via piping and is a tank that receives and stores drinking water from the cold water tank T1. A heating mechanism such as a heater H is provided around the hot water tank T2, and the drinking water in the hot water tank T2 is heated by the heater H to become hot water. The hot water tank T2 receives drinking water from the upper layer separated from the cold water tank T1 by a partition plate 20.

[0016] The first to third flow paths R1 to R3 are for guiding drinking water to the solenoid valve mechanism 40. Of these, the first flow path R1 is for guiding the chilled water in the lower layer of the partition plate 20 in the chilled water tank T1 to the solenoid valve mechanism 40. For example, one end of the first flow path R1 is connected to the lower layer of the partition plate 20 in the chilled water tank T1, and the other end is connected to the solenoid valve mechanism 40. The chilled water in the first flow path R1 is pumped to the solenoid valve mechanism 40 by a pump (not shown) or by utilizing water pressure.

[0017] The second flow path R2 is a flow path for guiding the warm water in the warm water tank T2 to the electromagnetic valve mechanism 40. The second flow path R2 is connected, for example, at one end to the warm water tank T2 and at the other end to the electromagnetic valve mechanism 40. Note that the warm water in the second flow path R2 is also pumped to the electromagnetic valve mechanism 40 by a pump (not shown) or by utilizing water pressure.

[0018] The third flow path R3 is a flow path for guiding the normal temperature water in the upper layer of the partition plate 20 in the cold water tank T1 to the electromagnetic valve mechanism 40. The third flow path R3 is connected, for example, at one end to the upper layer side of the partition plate 20 of the cold water tank T1 and at the other end to the electromagnetic valve mechanism 40. Note that the normal temperature water is guided to the electromagnetic valve mechanism 40 by utilizing its own weight.

[0019] FIG. 3 is a schematic diagram of the electromagnetic valve mechanism 40 shown in FIG. 2. As shown in FIG. 3, the electromagnetic valve mechanism 40 includes first and second electromagnetic valves V1, V2 (valve mechanism) (drinking water flow path), a third electromagnetic valve V3 (drinking water flow path), first and second inclined flow paths R41, R42 (inclined flow path) (drinking water flow path), an extended flow path R43 (drinking water flow path), and mesh members M1, N1. The first to third electromagnetic valves V1 to V3 constitute a part of the drinking water flow path. Further, the first to third flow paths R1 to R3, the first to third electromagnetic valves V1 to V3, the first and second inclined flow paths R41, R42, and the extended flow path R43 form a drinking water flow path that connects the drinking water bottle B, the cold water tank T1, and the warm water tank T2 to the water outlet 21 for discharging drinking water.

[0020] The first electromagnetic valve V1 is provided on one side among the three horizontally arranged electromagnetic valves V1 to V3 and is connected to the first flow path R1 (see FIG. 2). The second electromagnetic valve V2 is provided on the other side among the three horizontally arranged electromagnetic valves V1 to V3 and is connected to the second flow path R2 (see FIG. 2). The third electromagnetic valve V3 is provided in the center among the three horizontally arranged electromagnetic valves V1 to V3 and is connected to the third flow path R_{3} (see FIG. 2). These first to third electromagnetic valves V1 to V3 are used to open and close the drinking water flow path.

[0021] The first to third solenoid valves V1, V2, and V3 each comprise valve bodies V11, V21, and V31, valve seats V12, V22, and V32, and valve passages V13, V23, and V33.

[0022] Valve bodies V11 to V31 are components that can move in and out of contact with valve seats V12 to V32. When valve bodies V11 to V31 are in contact with valve seats V12 to V32, they prohibit the discharge of drinking water. When valve bodies V11 to V31 are separated from valve seats V12 to V32, they permit the discharge of drinking water.

[0023] Valve seats V12 to V32 are the parts to which valve bodies V11 to V31 can move toward and away from each other. Valve seat V12 is located above valve passage V13 and is continuous with valve passage V13. Valve seat V22 is located above valve passage V23 and is continuous with valve passage V23. Valve seat V32 is located above valve passage V33 and is continuous with valve passage V33. In this embodiment, valve passages V13 to V33 extend in the vertical direction.

[0024] The first inclined channel R41 is a channel that extends diagonally downward downstream of the valve channel V13. The flow direction of drinking water in the first inclined channel R41 is different from that of the valve channel V13. The other end (downstream part) of the first inclined channel R41 merges with the extended channel R43. The first inclined channel R41 is a channel that is slightly inclined from horizontal such that the other end is slightly lower than the other end.

[0025] The second inclined channel R42 is a channel that extends diagonally downward downstream of the valve channel V23. The flow direction of drinking water in the second inclined channel R42 is different from that of the valve channel V23. One end (downstream) of the second inclined channel R42 merges with the extended channel R43. The second inclined channel R42 is a channel that is slightly inclined from horizontal so that one end is slightly lower than the other end.

[0026] The extended channel R43 is a channel that extends vertically. The extended channel R43 extends downstream in a continuous manner with the other end (downstream part) of the first inclined channel R41, and also extends downstream in a continuous manner with one end (downstream part) of the second inclined channel R42. An outlet section 21 is provided at the lower end of the extended channel R43. In this embodiment, the extended channel R43 extends vertically.

[0027] With this configuration, when the valve body V11 separates from the valve seat V12 and the first solenoid valve V1 opens, the cold water in the first flow channel R1 (see Figure 2) flows through the valve seat V12, the valve flow channel V13, and the first inclined flow channel R41, and is discharged from the first inclined flow channel R41 through the extended flow channel R43. When the valve body V21 separates from the valve seat V22 and the second solenoid valve V2 opens, the hot water in the second flow channel R2 (see Figure 2) flows through the valve seat V22, the valve flow channel V23, and the second inclined flow channel R42, and is discharged from the second inclined flow channel R42 through the extended flow channel R43. In particular, during the water discharge described above, the flow direction of the valve channels V13 and V23 differs from that of the inclined channels R41 and R42. As a result, the flow of drinking water changes at the connection point between the valve channels V13 and V23 and the inclined channels R41 and R42. This point of change is called the change point P.

[0028] When the valve body V31 separates from the valve seat V32 and the third solenoid valve V3 opens, the ambient temperature water in the third flow channel R3 (see Figure 2) flows into the valve seat V32 and the valve flow channel V33, and is discharged through the extended flow channel R43. In this way, the discharge of drinking water is controlled according to the operation of the valve bodies V11 to V31. When the first to third solenoid valves V1 to V3 transition from an open state to a closed state, drinking water remains in the first and second inclined flow channels R41 and R42, and the extended flow channel R43.

[0029] Here, the solenoid valve mechanism 40 has removable valve bodies V11 and V21 (valve body V31 is also removable, but this is omitted here). In this embodiment, when valve bodies V11 and V21 are removed, the inside of the valve passages V13 and V23 and the first and second inclined passages R41 and R42 can be seen from the removal side. Such a visible area is called the visible area Q. In this embodiment, the above change point P is included within the visible area Q.

[0030] The mesh members M1 and N1 are formed in a mesh shape. The mesh members M1 and N1 are formed into a cylindrical shape by rolling up a mesh-like member that has been unfolded in a planar shape. It is preferable that the overlapping parts of the mesh members M1 and N1 are welded together when forming the cylindrical shape. For example, SUS304 (SUS stands for Stainless Used Steel) formed with a wire diameter of φ0.18 mm and 40 mesh can be used as the mesh members M1 and N1. The reduction in water output can be suppressed by using 40 mesh.

[0031] Furthermore, the mesh members M1 and N1 are positioned within the aforementioned visible area Q. In particular, in this embodiment, as shown in Figure 3, the mesh members M1 and N1 are positioned within the visible area Q, specifically at a location that includes the change point P. Also, as shown in Figure 3, the mesh members M1 and N1 are adjusted to a height that spans the valve passages V13 and V23, thereby engaging with the valve passages V13 and V23 and fixing them in predetermined positions within the inclined passages R41 and R42. The mesh members M1 and N1 are positioned with their mesh-like surfaces facing the direction of flow of the drinking water.

[0032] Figure 4(a) is a top view of the configuration of the first solenoid valve V1 with the valve body V11 removed. Figure 4(b) is a cross-sectional view along line AA in Figure 4(a). Figure 4(c) is a top view of the configuration of the second solenoid valve V2 with the valve body V21 removed. Figure 4(d) is a cross-sectional view along line BB in Figure 4(c). As shown in Figures 4(b) and (d), the valve passages V13 and V23 have tapered inner wall portions 13a and 23a, where the inner wall tapers towards the downstream direction. The valve passages V13 and V23 also have flared inner wall portions 13b and 23b, where the inner wall widens towards the downstream direction.

[0033] The upper ends of the flared inner wall sections 13b and 23b are continuous with the lower ends of the tapered inner wall sections 13a and 23a. The boundary between the tapered inner wall sections 13a and 23a and the flared inner wall sections 13b and 23b has the smallest hollow area among the tapered inner wall sections 13a and 23a and the flared inner wall sections 13b and 23b.

[0034] The mesh members M1 and N1 are entirely sandwiched between the tapered inner wall portions 13a and 23a and the flared inner wall portions 13b and 23b. More specifically, when the mesh members M1 and N1 are placed in the visible area Q, they are held in a state where they are most strongly pressed and sandwiched at the boundary between the tapered inner wall portions 13a and 23a and the flared inner wall portions 13b and 23b, resulting in a shape that is constricted in the middle of a cylindrical shape. In other words, when the mesh members M1 and N1 are placed, they are narrow at the boundary and widen as they move away from the boundary, and even in the widened portion, they are sandwiched by the tapered inner wall portions 13a and 23a and the flared inner wall portions 13b and 23b, providing a certain level of holding effect.

[0035] Next, the method for installing the mesh members M1 and N1 described above will be explained. During manufacturing, the manufacturer press-fits the mesh members M1 and N1 into the valve passages V13 and V23 from the valve seats V12 and V22. At this time, the mesh members M1 and N1 narrow as they advance through the tapered inner wall sections 13a and 23a, and widen as they advance through the flared inner wall sections 13b and 23b. Then, the manufacturer installs the valve bodies V11 and V21.

[0036] Next, the operation of the solenoid valve mechanism 40 when the user dispenses hot water will be explained with reference to Figures 4(c), 4(d), and 5. Figure 5 is a schematic diagram of the solenoid valve mechanism 40 when the second solenoid valve V2 is opened. First, as shown in Figure 5, the valve body V21 separates from the valve seat V22. The hot water passes through the second flow path R2 (see arrow L1 in Figures 4(c) and 4(d)). The hot water strikes the outer surface of the valve flow path V23 and enters the valve flow path V23 (see arrow L2 in Figures 4(c) and 4(d)). The hot water passes through the mesh member N1 and the second inclined flow path R42 (see arrow L3 in Figures 4(c) and 4(d)).

[0037] After passing through the second inclined channel R42, the hot water reaches the extended channel R43. At this time, the hot water flows vigorously through the second inclined channel R42, and upon reaching the extended channel R43, it tends to skip over the inner surface R43a closer to the second inclined channel R42 and flow along the inner surface R43b further from the second inclined channel R42 within the extended channel R43 (see symbol J). Because of this flow, air enters the dotted line region K on the inner surface R43a side.

[0038] When the second solenoid valve V2 is closed from this state, the air 5 in the dotted area K downstream of the mesh member N1 rises along the second inclined flow path R42. This air 5 is mainly stopped when it hits the mesh member N1, preventing it from passing through the holes in the mesh member N1. The same applies to the cold water and air 5 when the user dispenses cold water.

[0039] According to the configuration described above, the mesh members M1 and N1 are positioned within the visible area Q, including the change point P. Therefore, air 5 downstream of the mesh members M1 and N1 is blocked by the mesh members M1 and N1 and has difficulty rising to the valve bodies V11 and V21. Consequently, the area around the valve bodies V11 and V21 is filled with drinking water (hot water, cold water), and air pockets (air phases) are less likely to form around the valve bodies V11 and V21. Therefore, the phenomenon of drinking water evaporating due to air pockets around the valve bodies V11 and V21 is suppressed. Consequently, the precipitation of minerals around the valve bodies V11 and V21 is further suppressed. This suppresses the accumulation of minerals as foreign matter between the valve bodies V11 and V21 and the valve seats V12 and V22. As a result, the possibility of a decrease in the sealing performance of the first and second solenoid valves V1 and V2 when the valves are closed due to mineral precipitation is reduced.

[0040] The valve bodies V11 and V21 are positioned within the inclined flow paths R41 and R42, which have a different flow direction from the valve flow paths V13 and V23, and include a change point P. Therefore, the user can easily remove the valve bodies V11 and V21 and attach the mesh members M1 and N1 to the change point P, and easily remove the mesh members M1 and N1 from the change point P. In addition, if the mesh members M1 and N1 are formed to a height higher than the height of the inclined flow paths R41 and R42, the mesh members M1 and N1 will catch on the valve flow paths V13 and V23, making it difficult for them to move downstream within the inclined flow paths R41 and R42.

[0041] The valve passages V13 and V23 have tapered inner wall portions 13a and 23a, and the mesh members M1 and N1 are sandwiched between these tapered inner wall portions 13a and 23a. Because the tapered inner wall portions 13a and 23a are formed to taper, the mesh members M1 and N1 are sandwiched more tightly towards the tip of the tapered inner wall portions 13a and 23a, making it difficult for them to come out of the valve passages V13 and V23 during transport or use of the water server 1.

[0042] The valve passages V13 and V23 have flared inner wall portions 13b and 23b, and the mesh members M1 and N1 are sandwiched between these flared inner wall portions 13b and 23b. As a result, the parts of the mesh members M1 and N1 that widen within the flared inner wall portions 13b and 23b catch on the boundary between the tapered inner wall portions 13a and 23a and the flared inner wall portions 13b and 23b, making them less likely to come loose.

[0043] Although the present invention has been described above based on embodiments, the present invention is not limited to the above embodiments, and modifications may be made without departing from the spirit of the invention, and other technologies may be combined as appropriate to the extent possible.

[0044] For example, in this embodiment, mesh members M1 and N1 are arranged in both the valve passage V13 and the first inclined passage R41, and in both the valve passage V23 and the second inclined passage R42. However, the configuration is not limited to this, and mesh member N1 may be arranged only in the valve passage V23 and the second inclined passage R42. The valve seat V22, valve passage V23, and the second inclined passage R42 are passages through which hot water flows. Therefore, due to the high temperature, the drinking water evaporates due to air pockets, and minerals tend to precipitate. However, the presence of mesh member N1 is effective because it is placed in areas where precipitation is likely to occur.

[0045] Figure 6 is a schematic diagram of a modified solenoid valve mechanism 140. In this embodiment, the mesh members M1 and N1 are placed in the flow path after the valve bodies V11 and V21 are removed, but this is not the only way. The mesh members M2 and N2 may be placed in the flow path after the covers R41a and R42a provided at the ends of the first and second inclined flow paths R41 and R42 are removed. In this case, after the covers R41a and R42a are removed, the mesh members M2 and N2 are inserted into the first and second inclined flow paths R41 and R42 by press-fitting them.

[0046] In this embodiment, the mesh members M1 and N1 are positioned in the visible area Q, but are not limited to this, and may be positioned within the area from the valve seats V12 and V22 to the downstream ends S of the inclined flow channels R41 and R42. Even if they are positioned in this location, it is possible to suppress the air 5 that enters the extended flow channel R43 during water discharge from reaching the valve bodies V11 and V21.

[0047] Furthermore, when removing the lids R41a and R42a and inserting the mesh members M2 and N2 into the first and second inclined channels R41 and R42, it is preferable to use a larger mesh member N2 so that the mesh members M2 and N2 do not reach R43 as the drinking water flows. This is because the contact area between the mesh member N2 and the second inclined channel R42 becomes larger, making it easier to hold the mesh member N2 in place.

[0048] Furthermore, although this embodiment has been described assuming that the mesh members M1 and N1 are attached during the manufacturing of the water server 1, it is not limited to this, and they may also be attached during maintenance after the sale of the water server 1. In this case, the maintenance company or the like will remove the valve bodies V11 and V21 from the solenoid valve mechanism 40 of the water server that does not have the mesh members M1 and N1, and then attach the mesh members M1 and N1. [Explanation of symbols]

[0049] 1: Water dispenser 5: Air 10: Cabinet 11: Recess 13a, 23a: Tapered inner wall part 13b, 23b: Suehiro inner wall section 20: Partition plate 21: Demizube 30: Control Panel 40, 140: Solenoid valve mechanism B: Drinking water bottle (drinking water tank) C: Water conduit G: Cooler H: Heater K: Dotted line area L1, L2, L3: Arrows M1, M2, N1, N2: Mesh members P: Point of change Q: Visible area R1: First water channel (drinking water channel) R2: Second water channel (drinking water channel) R3: Third water channel (drinking water channel) R41: 1st inclined flow path (inclined flow path) (drinking water flow path) R41a: Lid R42: 2nd inclined flow path (inclined flow path) (drinking water flow path) R42a: Lid R43: Extended water channel (drinking water channel) S: Downstream end T1: Chilled water tank (drinking water tank) T2: Hot water tank (drinking water tank) V1: First solenoid valve (valve mechanism) (drinking water flow path) V2: Second solenoid valve (valve mechanism) (drinking water flow path) V3: Third solenoid valve V11, V21, V31: Valve body V12, V22, V32: Valve seat V13, V23, V33: Valve flow path

Claims

1. A drinking water tank for storing drinking water, A drinking water channel having an inclined channel that slopes diagonally downward downstream from the drinking water tank, and an extended channel that extends downstream in conjunction with the inclined channel and has a water outlet for discharging drinking water, Upstream of the inclined flow path, a valve mechanism that forms part of the drinking water flow path and has a valve body, a valve seat on which the valve body can move toward and away from, and a valve flow path continuous with the valve seat, opens and closes the drinking water flow path. Equipped with, A mesh member formed in a mesh shape is arranged within the region from the valve seat to the downstream end of the inclined flow path. The valve channel and the inclined channel have different flow directions for drinking water. The valve body is removable, With the valve body removed, the point at which the flow direction of the drinking water changes is visible, The mesh member is positioned at a location that includes the change point, The valve passage has an inner wall that tapers towards the downstream direction, and has a tapered inner wall portion that sandwiches the mesh member. A water dispenser characterized by the following features.

2. The valve passage has an inner wall that widens towards the downstream direction, and has a widening inner wall portion that sandwiches the mesh member. The water server according to claim 1, characterized in that the flared inner wall portion is continuous with the tapered inner wall portion.

3. The water server according to claim 1 or 2, characterized in that the valve seat, the valve passage, and the inclined passage are passages through which hot water flows.

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