Hot and cold water faucet

Abstract

To provide a hot and cold water faucet capable of suppressing water leak.SOLUTION: A hot and cold water faucet 10 comprises a stationary valve body 52, a movable valve body 50 having a flow passage formation recess 100 and sliding on the stationary valve body 52, a handle 14, and a lever shaft 46. The movable valve body 50 has a movable disc 82 abutting with the stationary valve body 52, and an upper member 80 disposed on the upper side of the movable disc 82. The upper member 80 may be a disc cover 88 engaging with the lever shaft 46 while fixed to the movable disc 82. The movable disc 82 has a recess not passing through the movable disc 82, and this recess may constitute the flow passage formation recess 100. On the movable disc 82, when a region on the radially outer side of the flow passage formation recess 100 is defined as an outer region S1, the disc cover 88 protrudes downward, and may have a pressing protrusion 102 that presses the outer region S1 downward.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a mixing valve. [Background technology]

[0002] As shown in JP 2023-35061 A, a hot water / cold water mixer faucet having a fixed valve body and a movable valve body is known. In this hot water / cold water mixer faucet, the movable valve body slides on the fixed valve body by operating the handle. As the movable valve body moves, the positional relationship between the movable valve body and the fixed valve body changes. Due to this change, the discharge amount and the hot water / cold water mixing ratio change.

[0003] The fixed valve body has a smooth upper surface and the movable valve body has a smooth lower surface. When these smooth surfaces abut against each other ideally, a seal is ensured and water leakage is prevented. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-35061 A Summary of the Invention [Problem to be solved by the invention]

[0005] In reality, water leakage may occur between the fixed valve body and the movable valve body, and it is preferable to suppress this water leakage.

[0006] One object of the present disclosure is to provide a novel structure capable of suppressing water leakage from between a fixed valve body and a movable valve body. [Means for solving the problem]

[0007] In one aspect, the hot and cold water mixing faucet has a fixed valve body having a hot water supply hole, a cold water supply hole, and a drain hole, a flow path forming recess, and is equipped with a movable valve body that slides on the fixed valve body, a handle that moves the movable valve body when operated, and a lever shaft that is linked to the handle, and the movable valve body has a movable platen that abuts against the fixed valve body, and an upper member arranged on the upper side of the movable platen. The upper member is a disk cover that is fixed to the movable platen and engages with the lever shaft. The movable platen has a recess that does not penetrate the movable platen, and this recess constitutes the flow path forming recess. In the movable platen, when the area radially outside the flow path forming recess is defined as the outer area, the disk cover has a pressing protrusion that protrudes downward and presses the outer area downward.

[0008] In another aspect, the hot and cold water mixing faucet comprises a fixed valve body having a hot water supply hole, a cold water supply hole and a drain hole, a movable valve body having a flow path forming recess and capable of sliding on the fixed valve body, and a handle for moving the movable valve body by operation. The movable valve body has a movable platen that abuts against the fixed valve body and an upper member arranged above the movable platen. The movable platen has a pressed portion that is pressed downward by the upper member. When the area radially outward from the flow path forming recess is defined as the outer area, the pressed portion is formed only in the outer area. Effect of the Invention

[0009] In one aspect, the novel structure suppresses water leakage from between the fixed valve body and the movable valve body. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a hot and cold water mixing valve according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of a valve assembly used in the hot and cold water mixer tap of FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the valve assembly of FIG. [Figure 4] FIG. 4 is an enlarged view of the circled area in FIG. [Diagram 5] Fig. 5 is a partially enlarged cross-sectional view of the valve assembly, similar to Fig. 4. The cross-sectional direction of Fig. 5 is different from that of Fig. 4. [Figure 6] FIG. 6 is a plan view of the fixed valve body. [Figure 7] FIG. 7 is a perspective view of the movable valve body. [Figure 8] FIG. 8(a) is a perspective view of the disc cover as viewed obliquely from above, and FIG. 8(b) is a perspective view of the disc cover as viewed obliquely from below. [Figure 9] 9(a) is a bottom view of the disc cover, FIG. 9(b) is a cross-sectional view taken along line bb in FIG. 9(a), and FIG. 9(c) is a cross-sectional view taken along line cc in FIG. 9(a). [Figure 10] FIG. 10 is a plan view of the movable platen. [Figure 11] FIG. 11 is a bottom view of the movable platen. [Figure 12] 12(a) to 12(f) are diagrams showing the positional relationship between the movable platen and the fixed valve body in each phase. [Figure 13] FIG. 13 is a plan view of the movable valve body. [Figure 14] FIG. 14 is a plan view of the movable valve body, similar to FIG. [Figure 15] FIG. 15 is a cross-sectional view of the movable valve body according to the second embodiment. [Figure 16] FIG. 16 is a cross-sectional view of a movable valve body according to the third embodiment. [Figure 17] FIG. 17 is a plan view of the movable platen according to the fourth embodiment. [Figure 18] FIG. 18 is a plan view of the movable valve body according to the first embodiment, similar to FIG. 13 and FIG. [Figure 19] FIG. 19(a) is a bottom view of a disc cover according to Comparative Example 1, and FIG. 19(b) is a bottom view of a disc cover according to Comparative Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiment will be described in detail with reference to the drawings as appropriate. In this application, the terms "water" and "hot water" are used. From the viewpoint of distinguishing the liquid from the hot water supply hole from the liquid from the water supply hole, "hot water" and "water" are used as necessary. On the other hand, there is also a description that the liquid from the hot water supply hole and the liquid from the water supply hole are collectively referred to as "water". In addition, in this application, terms such as top, upper side, bottom, lower side, left and right, top and bottom, etc. are used. These terms are based on the typical posture when the faucet of the embodiment is used. When the faucet is used in another posture, the meaning of these terms is interpreted according to that posture.

[0012] In the present application, the terms "radial direction" and "circumferential direction" are used. These refer to the radial direction and the circumferential direction of the smallest including circle C1 of the movable platen. The radial direction means the radial direction. The smallest including circle C1 will be described later.

[0013] Fig. 1 is a perspective view of a hot and cold water mixer 10 according to one embodiment. The hot and cold water mixer 10 has a main body 12, a handle 14, and a discharge portion 16. A hot water inlet pipe and a cold water inlet pipe (not shown) are connected to the main body 12. The hot and cold water mixer 10 is used, for example, in a kitchen, a washbasin, etc.

[0014] The discharge unit 16 has a head 20. The head 20 has a switching button 22 and a discharge port 24. A water purification cartridge (not shown) is built into the discharge unit 16. The switching button 22 switches between a flow path that passes through the water purification cartridge and a flow path that does not pass through the water purification cartridge. When switched to the flow path that passes through the water purification cartridge, purified water is discharged. When switched to the flow path that does not pass through the water purification cartridge, raw water is discharged.

[0015] The discharge volume is adjusted by rotating the handle 14 up and down. In this embodiment, the more the handle 14 is moved upward, the greater the discharge volume. When the handle 14 is in the lowest position, water is stopped. Conversely, the discharge volume may increase as the handle 14 is moved downward. The mixture ratio of hot water and cold water changes by rotating the handle 14 left and right. The temperature of the discharged water can be adjusted by rotating the handle 14 left and right.

[0016] Fig. 2 is a perspective view of the valve assembly 30. Fig. 3 is a cross-sectional view of the valve assembly 30. Fig. 4 is an enlarged view of the circled area in Fig. 3. Fig. 5 is an enlarged cross-sectional view of the valve assembly 30 at a cross-sectional position different from that in Fig. 4. In the hot and cold water mixer 10, the valve assembly 30 is replaceable.

[0017] The valve assembly 30 is built into the main body 12 of the hot and cold water mixer 10. As shown in Figures 3 and 4, the valve assembly 30 has a moving body 40, a housing 42, a rotating body 44, a lever shaft 46, and a lever shaft fixing pin 48.

[0018] The moving body 40 is held by the rotating body 44 in a state in which it can move up and down. The moving body 40 can only move up and down with respect to the rotating body 44, and cannot rotate relatively to the rotating body 44. The moving body 40 is configured to rotate together with the rotating body 44 in conjunction with the left and right rotation of the handle 14, and to be able to move up and down in conjunction with this rotation. The up and down movement of the moving body 40 is achieved by a cam mechanism formed between the moving body 40 and the housing 42. Depending on the vertical position of the moving body 40, it is determined whether or not a click mechanism occurs when the handle 14 rotates up and down.

[0019] The housing 42 has a small diameter cylindrical portion 42a and a large diameter cylindrical portion 42b. The small diameter cylindrical portion 42a is located above the large diameter cylindrical portion 42b. The moving body 40 is placed on the small diameter cylindrical portion 42a.

[0020] The rotating body 44 is disposed inside the housing 42. The rotating body 44 is rotatably held by the small diameter cylindrical portion 42a. The rotating body 44 rotates in conjunction with the left and right rotation of the handle 14. The rotating body 44 holds the lever shaft 46 in a state in which it can rotate back and forth. The forward and backward rotation of the lever shaft 46 is rotation that occurs in conjunction with the up and down rotation of the handle 14.

[0021] The handle 14 is fixed to the lever shaft 46. The lever shaft 46 is attached to the rotating body 44 so as to be rotatable back and forth. The lever shaft fixing pin 48 penetrates the lever shaft 46. Both ends of the lever shaft fixing pin 48 are inserted into shaft holes provided in the rotating body 44. The lever shaft 46 rotates back and forth around the lever shaft fixing pin 48 as a rotation axis. In Figs. 3 and 4, the cross section of the lever shaft fixing pin 48 is elliptical due to the position of the cross section, and in Fig. 5, it is deformed, but the lever shaft fixing pin 48 is a straight axis. The lever shaft 46 rotates back and forth in conjunction with the up and down rotation of the handle 14. When the handle 14 is rotated left and right, the rotating body 44 is rotated via the lever shaft 46 and the lever shaft fixing pin 48. That is, when the handle 14 is rotated left and right, the rotating body 44, the lever shaft 46, and the lever shaft fixing pin 48 rotate together.

[0022] Furthermore, the valve assembly 30 includes a movable valve body 50 , a fixed valve body 52 , a packing 54 , and a base body 56 .

[0023] The packing 54 watertightly connects each hole of the fixed valve body 52 to each hole of the base body 56. The packing 54 supports the fixed valve body 52 from below.

[0024] The base body 56 constitutes the lower end of the valve assembly 30. The housing 42 is attached to the upper side of the base body 56. The base body 56 has a discharge port 60, a hot water inlet 62, and a water inlet 64. The main body 12 adjacent to the lower part of the base body 56 has openings corresponding to the discharge port 60, the hot water inlet 62, and the water inlet 64, respectively. A discharge pipe, a hot water inlet pipe, and a water inlet pipe (none of which are shown) are connected to each of these openings.

[0025] The fixed valve body 52 is disposed above the base body 56 via a packing 54. Fig. 6 is a plan view of the fixed valve body 52 as viewed from above. The fixed valve body 52 has a hot water supply hole 70, a water supply hole 72, and a drain hole 74. The hot water supply hole 70, the water supply hole 72, and the drain hole 74 pass through the fixed valve body 52. ​​The hot water supply hole 70 is connected to the hot water inlet 62 of the base body 56. The water supply hole 72 is connected to the water inlet 64 of the base body 56. The drain hole 74 is connected to the discharge port 60 of the base body 56.

[0026] The fixed valve body 52 has a first smooth surface 52a. The first smooth surface 52a forms the upper surface of the fixed valve body 52. ​​The fixed valve body 52 is made of ceramics.

[0027] The movable valve body 50 has an upper member 80 and a movable platen 82. The upper member 80 is located above the movable platen 82. The upper member 80 abuts against the upper surface of the movable platen 82. The upper member 80 is fixed to the movable platen 82. The upper member 80 is made of resin. The movable platen 82 is made of ceramics.

[0028] FIG. 7 is a perspective view of the movable valve body 50. FIG. 8(a) is a perspective view of the upper member 80 as viewed obliquely from above. FIG. 8(b) is a perspective view of the upper member 80 as viewed obliquely from below. FIG. 9(a) is a bottom view of the upper member 80 as viewed from below. FIG. 9(b) is a cross-sectional view taken along line bb in FIG. 9(a). FIG. 9(c) is a cross-sectional view taken along line cc in FIG. 9(a). FIG. 10 is a plan view of the movable platen 82 as viewed from above. FIG. 11 is a bottom view of the movable platen 82 as viewed from below.

[0029] 7, the movable valve body 50 is composed of an upper member 80 and a movable platen 82. The upper member 80 is fixed to the upper side of the movable platen 82.

[0030] 8(a), the upper member 80 has a lever engagement portion 84 that engages with the lever shaft 46. The lever engagement portion 84 engages with the lower end portion 46a of the lever shaft 46. Due to this engagement, the forward and backward rotation of the lever shaft 46 is transmitted to the movable valve body 50, which moves. The lever engagement portion 84 is a through hole that passes through the upper member 80. The lever engagement portion 84 may be, for example, a recess that does not pass through the upper member 80.

[0031] In this embodiment, the upper member 80 is a disc cover 88. The disc cover 88 is fixed to the movable platen 82 and engaged with the lever shaft 46. The engagement between the disc cover 88 and the lever shaft 46 transmits the movement of the lever shaft 46 to the movable valve body 50.

[0032] The disc cover 88 has a slide guide portion 90 on its upper surface. The slide guide portion 90 is composed of a plurality of grooves and / or protrusions. These grooves and / or protrusions extend along a predetermined linear direction. This slide guide portion 90 slidably engages with the lower surface of the rotating body 44. In conjunction with the forward and backward rotation of the lever shaft 46, the disc cover 88 (movable valve body 50) moves along the linear direction.

[0033] With reference to FIG. 10, a minimum inclusive circle C1 is defined for the movable platen 82. The minimum inclusive circle C1 is defined based on a plan view as shown in FIG. 10. In this plan view, the minimum inclusive circle C1 is the smallest circle that contains the entire movable platen 82 within itself. Since the contour shape of the movable platen 82 is approximately circular, the minimum inclusive circle C1 approximately coincides with the contour line of the movable platen 82. In FIG. 10, the minimum inclusive circle C1 is indicated by a two-dot chain line, but most of this two-dot chain line overlaps with the contour line (solid line) of the movable platen 82 and is therefore not visible. The two-dot chain line of the minimum inclusive circle C1 is visible only in the portion where the contour line of the movable platen 82 is non-circular (the upper position in FIG. 10).

[0034] The reason for defining the minimum including circle C1 in this manner is to define the radius, diameter, circumferential direction, and radial direction of the movable platen 82 even if the movable platen 82 is not circular. In this application, the radius, diameter, circumferential direction, and radial direction of the minimum including circle C1 are referred to as the radius, diameter, circumferential direction, and radial direction of the movable platen 82, respectively. The movable platen 82 in the plan view does not have to be circular. The movable platen 82 of this embodiment is also not a perfect circle.

[0035] The circumferential and radial directions of this minimum inclusive circle C1 also apply to the upper member 80 (disc cover 88) fixed to the movable platen 82. In this application, the circumferential and radial directions of the minimum inclusive circle C1 are also referred to as the circumferential and radial directions of the upper member 80 (disc cover 88), respectively. The upper member 80 (disc cover 88) in a plan view does not have to be circular. The disc cover 88 of this embodiment is also not a perfect circle.

[0036] As shown in FIG. 9(a), the upper member 80 (disc cover 88) has a plurality of positioning protrusions 92 on its lower surface 104. Each positioning protrusion 92 protrudes towards the movable platen 82. In this embodiment, five positioning protrusions 92 are provided. The plurality of positioning protrusions 92 are distributed and arranged at different circumferential positions. Each positioning protrusion 92 is arranged on the outer side in the radial direction. They are arranged at a position along the side surface 94 of the disc cover 88. Each positioning protrusion 92 protrudes downward.

[0037] As shown in FIG. 10, the movable platen 82 has a plurality of positioning recesses 96 on its upper surface 82b. In this embodiment, five positioning recesses 96 are provided. The plurality of positioning recesses 96 are distributed and arranged at different circumferential positions. Each of the positioning recesses 96 is arranged on the outer side in the radial direction. Each positioning recess 96 is arranged at a position along a side surface 98 of the movable platen 82. Each positioning recess 96 is recessed downward. Note that each positioning recess 96 is arranged along the side surface 98, and therefore the side surface 98 of the movable platen 82 is removed by the positioning recess 96. As a result, the positioning recess 96 forms a recess that is also recessed radially inward. The positioning recess 96 has a bottom surface 96a.

[0038] The upper member 80 (disc cover 88) is fixed to the movable platen 82 by the engagement between the positioning protrusions 92 and the positioning recesses 96. The positions of the positioning recesses 96 correspond to the positions of the positioning protrusions 92. As shown in FIG. 7, each of the positioning recesses 96 engages with each of the positioning protrusions 92. Each of the positioning protrusions 92 is inserted into each of the positioning recesses 96. The positioning recesses 96 and the positioning protrusions 92 are not arranged at equal intervals in the circumferential direction. When all the positioning protrusions 92 engage with all the positioning recesses 96, there is only one positional relationship between the upper member 80 (disc cover 88) and the movable platen 82. The upper member 80 (disc cover 88) is positioned in the circumferential direction (rotational direction) with respect to the movable platen 82 by the engagement between the positioning protrusions 92 and the positioning recesses 96.

[0039] As shown in FIG. 11, the movable platen 82 has a flow path forming recess 100 on its lower surface. The flow path forming recess 100 is a recess that opens downward. The flow path forming recess 100 has a lower opening edge 100a and a bottom surface 100b. The movable platen 82 has a second smooth surface 82a. The second smooth surface 82a is formed around the flow path forming recess 100. The second smooth surface 82a is in surface contact with the first smooth surface 52a of the fixed valve body 52. ​​The mixing ratio and discharge amount of hot water and cold water are determined based on the overlapping state between the flow path forming recess 100 and each hole (hot water supply hole 70, cold water supply hole 72, and discharge hole 74) of the fixed valve body 52. ​​When the handle 14 is operated, the movable valve body 50 engaged with the lever shaft 46 moves, and the overlapping state changes.

[0040] In this embodiment, the flow path forming recess 100 is formed by a recess that does not penetrate the movable platen 82. Therefore, as described above, the bottom surface 100b of the flow path forming recess 100 is formed by the movable platen 82. Unlike this configuration, the flow path forming recess may be formed by a hole penetrating the movable platen. In this case, the through hole of the movable platen is blocked from above by the upper member (and the seal). That is, in this case, the bottom surface of the flow path forming recess is formed by the upper member (disk cover, etc.). As a result, the hole penetrating the movable platen constitutes a recess as the movable valve body 50 including the movable platen and the upper member, and this recess functions as the flow path forming recess. The case where a through hole is formed in the movable platen will be described later.

[0041] 12(a) to (f) are diagrams showing the positional relationship between the movable platen 82 and the fixed valve body 52 in each phase. In these figures, the lines on the underside of the movable platen 82 that can be seen through when viewed from above are shown with relatively thick solid lines, and the plan view of the fixed valve body 52 is shown with relatively thin lines. In FIG. 12(a), the left-right position of the handle 14 is at the limit position on the hot water side (left side), and the up-down position of the handle 14 is at the water stop position (lowest position). In this phase, the flow path forming recess 100 does not overlap the hot water supply hole 70 and the water supply hole 72, and the water stop state is achieved. In FIG. 12(b), the left-right position of the handle 14 is at the front position, and the up-down position of the handle 14 is at the water stop position (lowest position). In this phase, the flow path forming recess 100 does not overlap the hot water supply hole 70 and the water supply hole 72, and the water stop state is achieved. In FIG. 12(c), the handle 14 is at the left-right limit on the water side (right side), and the handle 14 is at the up-down limit in the water-stop position (lower limit position). Even in this state, the flow path forming recess 100 does not overlap the hot water supply hole 70 and the water supply hole 72, and the water-stop state is achieved. In FIG. 12(d), the handle 14 is at the left-right limit on the hot water side (left side), and the handle 14 is at the up-down limit in the maximum water discharge position (upper limit position). In this state, the flow path forming recess 100 mainly overlaps the hot water supply hole 70 and the discharge hole 74, and hot water is discharged. In FIG. 12(e), the handle 14 is at the front position, and the handle 14 is at the up-down limit in the maximum water discharge position (upper limit position). In this state, the flow path forming recess 100 overlaps the water supply hole 72 and the discharge hole 74 without overlapping the hot water supply hole 70, and only water is discharged. In Fig. 12(f), the handle 14 is at the left-right limit on the water side (right side), and the handle 14 is at the up-down limit at the maximum water discharge position (upper limit position). In this state, the flow path forming recess 100 overlaps with the water supply hole 72 and the drain hole 74 without overlapping with the hot water supply hole 70, and only water is discharged. Although not shown, when the handle 14 is at the left-right position between Fig. 12(d) and Fig. 12(e), the flow path forming recess 100 overlaps with the hot water supply hole 70, the water supply hole 72, and the drain hole 74, and a mixture of hot and cold water can be discharged.

[0042] As described above, when the handle 14 is in the front position in the left-right direction, the hot and cold water mixer 10 dispenses only cold water. This specification contributes to saving hot water and improves energy conservation.

[0043] 12(a) to 12(f) is a surface overlap region R1 where the first smooth surface 52a of the fixed valve body 52 and the second smooth surface 82a of the movable platen 82 overlap. The surface overlap region R1 provides a seal and can prevent water leakage.

[0044] Pressure (contact pressure) acts between the first smooth surface 52a of the fixed valve body 52 and the second smooth surface 82a of the movable platen 82. As shown in FIG. 3, the movable valve body 50 and the fixed valve body 52 are housed in a space defined by the housing 42 and the base body 56, and are compressed in the vertical direction due to the dimensional relationship within this space. The above-mentioned packing 54 is involved in this compression. As shown in FIG. 3 to FIG. 5, the valve assembly 30 has the packing 54 that connects the base body 56 and the fixed valve body 52 in a watertight manner. The packing 54 supports the fixed valve body 52 from below. The packing 54 presses the fixed valve body 52 upward while being compressed. The contact pressure between the first smooth surface 52a and the second smooth surface 82a can be adjusted by the dimensions, material, etc. of the packing 54.

[0045] As shown in Fig. 8(b), the upper member 80 (disc cover 88) has a protrusion 102. This protrusion 102 is called a pressing protrusion because it presses against the upper surface 82b of the movable platen 82. The pressing protrusion 102 is provided on a lower surface 104 of the disc cover 88. The pressing protrusion 102 protrudes downward. The pressing protrusion 102 protrudes downward from the lower surface 104.

[0046] In this embodiment, multiple (seven) pressing protrusions 102 are provided. The number of pressing protrusions 102 is not limited. There may be only one pressing protrusion 102. As described above, the disc cover 88 has multiple positioning protrusions 92. The pressing protrusions 102 are disposed at positions along the side surface 94 of the disc cover 88. In the disc cover 88, the radial positions of all of the pressing protrusions 102 are the same.

[0047] The radial position of the pressing protrusion 102 includes the radial position of the positioning protrusion 92. Therefore, the pressing protrusion 102 and the positioning protrusion 92 have different circumferential positions. That is, the pressing protrusion 102 is disposed at a different circumferential position from the positioning protrusion 92. The pressing protrusion 102 is disposed between adjacent positioning protrusions 92. The portion between adjacent positioning protrusions 92 is also referred to as an inter-adjacent portion. The number of inter-adjacent portions is the same as the number of positioning protrusions 92. In the disc cover 88, the number of positioning protrusions 92 is five, and the number of inter-adjacent portions is also five. At least one pressing protrusion 102 is disposed in each of all (five) inter-adjacent portions.

[0048] As clearly shown in the enlarged portion of Figure 4, the pressing protrusion 102 abuts against the movable platen 82. The pressing protrusion 102 presses the movable platen 82 downward. The lower end surface of the pressing protrusion 102 presses the upper surface 82b of the movable platen 82 downward. In the disc cover 88, only the pressing protrusion 102 presses the movable platen 82 downward.

[0049] It should be noted that the positioning protrusion 92 of the disc cover 88 does not press the movable platen 82 downward. As shown in Fig. 8(b) and Figs. 9(a) to (c), the positioning protrusion 92 has a lower end surface 92a. As shown in Fig. 7, the lower end surface 92a does not contact the bottom surface 96a of the positioning recess 96. There is a gap between the lower end surface 92a and the bottom surface 96a.

[0050] The engagement between the positioning protrusion 92 and the positioning recess 96 determines one orientation of the disk cover 88 relative to the movable platen 82. This engagement positions the disk cover 88 relative to the movable platen 82 in the circumferential and radial directions. Meanwhile, the positioning in the vertical direction is achieved by the lower surface 104 of the disk cover 88 abutting against the upper surface 82b of the movable platen 82. This abutment reliably achieves the positioning in the vertical direction, and precisely specifies the attitude of the disk cover 88 relative to the movable platen 82, thereby improving the dimensional accuracy of the movable valve body 50. The height of the positioning protrusion 92 is set so as not to reach the bottom surface 96a of the positioning recess 96 in order to reliably abut the lower surface 104 of the disk cover 88 against the upper surface 82b of the movable platen 82. This point is the same in a conventional movable valve body having a disk cover. That is, even in the conventional movable valve body, a configuration is disclosed in which the positioning protrusion of the disc cover engages with the positioning recess 96 of the movable platen 82, but for the reasons described above, the positioning protrusion does not reach the bottom surface of the positioning recess. That is, even in the conventional movable valve body, the positioning protrusion does not press the movable platen 82 downward.

[0051] In the movable valve body 50, the pressing protrusion 102 is disposed in the outer region S1. As shown in FIG. 3, the outer region S1 is a region radially outward of the flow passage forming recess 100. In other words, the outer region S1 is a region radially outward of the lower surface opening edge 100a. The position of the lower surface opening edge 100a is not included in the outer region S1. In FIG. 3, straight lines L1 and L2 are shown by dashed lines. The straight lines L1 and L2 are the positions of the lower surface opening edge 100a in the cross section. FIG. 3 shows an example of a radial cross section. In this FIG. 3, the region to the left of the straight line L1 and the region to the right of the straight line L2 are the outer region S1. The outer region S1 is determined for each radial cross section. The radial cross section is a cross section along the radial direction. This radial cross section is a cross section by a plane passing through the center of the minimum including circle C1 and perpendicular to the second smooth surface 82a. Since there are an infinite number of radial directions (angles), an infinite number of radial cross sections can be set. The position of the flow passage forming recess 100 differs in each radial cross section. The outer region S1 is determined in each radial cross section. That is, in each radial cross section, the region radially outward of the flow passage forming recess 100 in that radial cross section is the outer region S1.

[0052] Depending on the shape of the lower surface opening edge 100a, the flow passage forming recess 100 may appear in two or more separate locations on one radial cross section. In this case, too, the point located on the radially outermost side of the lower surface opening edge 100a on the cross section is determined. The region radially outer than this point is the outer region S1.

[0053] The pressing protrusion 102 presses the outer region S1 downward. The pressing protrusion 102 is disposed only in the outer region S1. The pressing protrusion 102 is in contact only with the outer region S1. The pressing protrusion 102 presses only the outer region S1 downward.

[0054] Fig. 13 is a plan view of the movable platen 82 as seen from above, similar to Fig. 10. In Fig. 13, a lower opening edge 100a of a flow path forming recess 100 formed in the lower surface of the movable platen 82 is indicated by a dashed line.

[0055] The flow path forming recess 100 has a radially outermost position P1. The lower surface opening edge 100a of the flow path forming recess 100 has a point or range located radially outermost. The radial position of this point or range is the radially outermost position P1. A circle that is concentric with the minimum inclusive circle C1 and passes through this radially outermost position P1 is the reference circle C2. The region radially outer than the reference circle C2 is defined as the outermost peripheral region S2.

[0056] FIG. 14 is a diagram in which the contact portions of the pressing protrusions 102 are added by dashed lines to FIG. 13. The pressing protrusions 102 press the outermost region S2 downward. The pressing protrusions 102 press only the outermost region S2. The pressing protrusions 102 are in contact only with the outermost region S2. The pressing protrusions 102 press only the outermost region S2 downward. The contact positions of the pressing protrusions 102 are all in contact with the outer edge 82c of the upper surface 82b of the movable platen 82. Therefore, each pressing protrusion 102 presses the movable platen 82 at its outermost position in the radial direction.

[0057] In a radial cross section passing through each pressing protrusion 102, all pressing protrusions 102 are located radially outward of the lower surface opening edge 100a. That is, all pressing protrusions 102 are arranged in the outer region S1. The pressing protrusions 102 press only the outer region S1. All of the contact portions between the upper surface 82b of the movable platen 82 and the pressing protrusions 102 are located in the outer region S1. Note that a portion of the contact portion between the upper surface 82b of the movable platen 82 and the pressing protrusions 102 may be located in the outer region S1.

[0058] All of the pressing protrusions 102 are located radially outward from the reference circle C2. That is, all of the pressing protrusions 102 press only the outermost peripheral region S2. All of the contact portions between the upper surface 82b of the movable platen 82 and the pressing protrusions 102 are located in the outermost peripheral region S2.

[0059] 15 is a cross-sectional view showing a movable valve body 150 in a hot and cold water mixer tap of the second embodiment. Except for the movable valve body 150 being different from the movable valve body 50, the hot and cold water mixer tap of the second embodiment is the same as the hot and cold water mixer tap of the first embodiment.

[0060] The movable valve body 150 has an upper member 180 and a movable platen 182. The movable platen 182 is the same as the movable platen 82 of the first embodiment. The movable platen 182 has a flow path forming recess 200, a lower surface (second smooth surface) 182a, and an upper surface 182b. The flow path forming recess 200 has a lower surface opening edge 200a. The lower surface opening edge 200a is formed on the lower surface (second smooth surface) 182a.

[0061] The upper member 180 is different from the upper member 80 of the first embodiment. The upper member 180 has an intervening member 186 and a disc cover 188. The intervening member 186 is interposed between the movable platen 182 and the disc cover 188. The disc cover 188 has a lower surface recess 189 in which the intervening member 186 is disposed. In the disc cover 188, all the pressing protrusions 102 in the disc cover 88 of the first embodiment are replaced with the lower surface recess 189. The intervening member 186 is disposed in each of these lower surface recesses 189. Except for this point, the disc cover 188 is the same as the disc cover 88. As in the movable valve body 50 of the first embodiment, in the movable valve body 150, the disc cover 188 is fixed to the movable platen 182.

[0062] The intervening member 186 protrudes downward below a lower surface 204 of the disc cover 188. The intervening member 186 presses an upper surface 182b of the movable platen 182 downward. The intervening member 186 constitutes a pressing protrusion 202 that presses an outer region S1 of the movable platen 182 downward. In the movable valve body 150, the position where the upper member 180 presses the movable platen 182 downward is the same as that of the movable valve body 50 of the first embodiment.

[0063] The material of the intervening member 186 is not limited. Examples of the material of the intervening member 186 include resin and metal. It is preferable that the material of the intervening member 186 is not a soft material. In the case of a soft material, the pressure is dispersed and the pressing force per unit area may decrease. In this case, the pressing range may vary depending on the crushing allowance. From these viewpoints, it is preferable that the intervening member 186 is not a sealing member.

[0064] 16 is a cross-sectional view showing a movable valve body 250 in a hot and cold water mixer tap of the third embodiment. Except for the movable valve body 250 being different from the movable valve body 50, the hot and cold water mixer tap of the third embodiment is the same as the hot and cold water mixer tap of the first embodiment.

[0065] The movable valve body 250 has an upper member 280 and a movable platen 282. The upper member 280 is composed of only a disk cover 288. A lower surface 304 of the disk cover 288 does not have the pressing protrusion 102 of the disk cover 88. Except for this configuration, the disk cover 288 is the same as the disk cover 88. The movable platen 282 has a flow path forming recess 300, an upper surface 282b, and a lower surface (second smooth surface) 282a. The flow path forming recess 300 has a lower surface opening edge 300a. The lower surface opening edge 300a is formed on the lower surface (second smooth surface) 282a.

[0066] The movable platen 282 has a pressed convex portion 283 on its upper surface 282b. The pressed convex portion 283 is a convex portion that protrudes upward from the upper surface 282b of the movable platen 282. The pressed convex portion 283 is provided in a portion of the movable platen 82 that was in contact with the pressing convex portion 102. Except for this configuration, the movable platen 282 is the same as the movable platen 82.

[0067] The pressed convex portion 283 abuts against the lower surface 304 of the disc cover 288. The pressed convex portion 283 is pressed downward by the lower surface 304 of the disc cover 288. In the movable valve body 250, the position where the upper member 280 presses the movable platen 282 downward is the same as that of the movable valve body 50 of the first embodiment.

[0068] FIG. 17 is a plan view of the movable platen 382 in the hot and cold water mixer tap of the fourth embodiment seen from above. The movable platen 382 has a through hole 383. This through hole 383 constitutes a flow passage forming recess 400 of the movable valve body associated with the movable platen 382. That is, the through hole 383 is covered from above by the disk cover 88, so that a recess is formed as a movable valve body including the through hole 383 and the disk cover 88. This recess is the flow passage forming recess 400. Although not shown, the flow passage forming recess 400 forms a lower surface opening edge on the lower surface of the movable platen 382. This lower surface opening edge is the lower surface opening edge of the through hole 383. The shape of this lower surface opening edge is the same as the opening edge 100a described above. In addition, the through hole 383 forms an upper surface opening edge 383b on the upper surface 382b of the movable platen 382. The shape of the upper surface opening edge 383b is a circle. The center of this circle is the same as the center of the minimum inclusive circle C1. The disk cover is the disk cover 88 of the first embodiment described above. Except for this movable valve body, the hot and cold water mixing faucet of the fourth embodiment is the same as the hot and cold water mixing faucet of the first embodiment.

[0069] In this embodiment, a seal member (such as an O-ring) is provided between the disk cover 88 and the movable platen 382. The seal member seals the upper opening of the through hole 383 watertightly, and a flow path forming recess 400 is formed.

[0070] In the movable platen 382 having the through hole 383, an outer region S1 is defined as a region radially outward from the flow path forming recess 400. Furthermore, in the movable platen 382, ​​a reference circle C2 and an outermost region S2 are defined as a region radially outward from the reference circle C2. Unlike the first to third embodiments described above, the outer region S1 and the reference circle C2 are determined based on the upper surface opening edge 383b of the through hole 383. That is, when the flow path forming recess 400 is formed by the hole 383 penetrating the movable platen 382, ​​the outer region S1 and the outermost region S2 are determined based on the upper surface opening edge 383b, not the lower surface opening edge. The outer region S1 is a region radially outward from the upper surface opening edge 383b. The reference circle C2 is a circle passing through the radially outermost position P1 of the upper surface opening edge 383b. The region radially outward from the reference circle C2 is the outermost region S2. In this embodiment, the radially outermost position P1 is any point on the upper surface opening edge 383b, and the reference circle C2 coincides with the upper surface opening edge 383b.

[0071] As in the first embodiment, in this fourth embodiment, the pressing protrusion 102 preferably presses the outer region S1, and more preferably presses only the outer region S1. The pressing protrusion 102 preferably presses the outermost region S2, and more preferably presses only the outermost region S2. The pressing protrusion 102 preferably presses the outer edge region S3, and more preferably presses only the outer edge region S3. The pressing protrusion 102 preferably presses the peripheral region S4, and more preferably presses only the peripheral region S4.

[0072] As described above, in all the embodiments, the movable platen is locally pressed downward by the upper member. The pressing position is radially outward from the flow passage forming recess. In the first embodiment (FIG. 4), the movable platen 82 is pressed downward by a convex portion (pressing convex portion 102) formed on the upper member 80 (disc cover 88). This is similar to the fourth embodiment. In the second embodiment (FIG. 15), the convex portion of the upper member 180 is formed by an intervening member 186 interposed between the disc cover 188 and the movable platen 182, and the movable platen 182 is pressed downward by this intervening member 186. In the third embodiment (FIG. 16), the upper member 280 does not have a downward convex portion, but the movable platen 282 has an upward convex portion (pressed convex portion 283). In all the embodiments, the movable platen has a pressed portion E1 pressed downward by the upper member. In the first embodiment (FIG. 4), the portion pressed downward by the pressing protrusion 102 is the pressed portion E1. In the second embodiment (FIG. 15), the portion pressed downward by the intervening member 186 is the pressed portion E1. In the third embodiment (FIG. 16), the pressed protrusion 283 is the pressed portion E1. In all embodiments, the position of the pressed portion E1 is the same. In all embodiments, it is only the pressed portion E1 that is pressed downward on the movable platen.

[0073] In this way, the configuration for forming the pressed portion E1 is not limited. The pressed portion E1 may be formed by a downward convex portion formed on the upper member, or may be formed by an upward convex portion formed on the movable platen. Of course, the pressed portion E1 may be formed by a downward convex portion formed on the upper member and an upward convex portion formed on the movable platen. The pressed portion E1 may be formed by the abutment of an intervening member sandwiched between the upper member and the movable platen. The intervening member may be fixed to the upper member, may be fixed to the movable platen, or may not be fixed to either the upper member or the movable platen.

[0074] The above-described embodiments provide the following advantages.

[0075] In the first to fourth embodiments, the pressed portion E1 is disposed in the outer region S1, which is a region radially outward from the flow passage forming recess. That is, the entire contact surface where the upper member presses the movable platen downward belongs to the outer region S1. It was found that this configuration suppresses water leakage from between the movable valve body and the fixed valve body.

[0076] Conventionally, no consideration has been given to the position at which the movable platen is pressed downward. The movable platen and the fixed valve body are formed with high strength and high rigidity because their smooth surfaces slide against each other while ensuring watertightness by pressing the smooth surfaces against each other. The movable platen and the fixed valve body, which have high rigidity, have been considered to be essentially rigid bodies. For this reason, it has been thought that there is no room for consideration of the position at which the movable platen is pressed downward.

[0077] However, it was found that the water leakage was suppressed by placing the pressed portion E1 in the outer region S1. In view of this effect, the following became clear. That is, it is considered that due to the arrangement of the pressed portion E1, the attitude of the movable platen is controlled when water pressure is applied, and the movable platen is extremely deformed. As a result, it was found that the sealing performance due to the pressure contact between the smooth surfaces in the outer part of the movable platen is improved, and the water leakage suppression effect is enhanced. By arranging the pressed portion E1 only in the outer region S1, this water leakage suppression effect is further enhanced.

[0078] In the first to fourth embodiments, the pressed portion E1 is disposed only in the outermost region S2, which is a region radially outward from the outermost position of the flow passage recess in the radial direction. That is, the entire contact portion where the upper member presses the movable platen downward belongs to the outermost region S2. This further enhances the water leakage suppression effect.

[0079] In the first to fourth embodiments, the pressed portion E1 is disposed only in the outer edge region S3. That is, the entire contact portion where the upper member presses the movable platen downward belongs to the outer edge region S3. This further enhances the water leakage suppression effect. The outer edge region S3 will be described later.

[0080] In the first to fourth embodiments, the pressed portion E1 is disposed only in the peripheral region S4. That is, the entire contact portion where the upper member presses the movable platen downward belongs to the peripheral region S4. This further enhances the water leakage suppression effect. The peripheral region S4 will be described later.

[0081] In the first to fourth embodiments, all the pressed parts E1 are arranged as far outward as possible in the radial direction. That is, all the pressed parts E1 are arranged in contact with the outer edge of the upper surface of the movable platen. Therefore, water leakage is effectively suppressed.

[0082] In the first embodiment, the disc cover has a pressing protrusion 102 protruding downward, and this pressing protrusion 102 presses the outer region S1 of the movable platen 82 downward. This disc cover requires lower wear resistance and rigidity than the movable platen, and can be easily molded. Therefore, the pressing protrusion 102 can be molded relatively easily. When the disc cover is made of resin, it is particularly easy to mold the pressing protrusion 102. Considering the processability of ceramics, when the material of the movable platen 82 is ceramics, it is easier to form a downward protrusion on an upper member such as a disc cover than to form an upward protrusion on the movable platen 82.

[0083] In FIG. 13, the symbol C3 denotes a circle located X mm inward from the minimum inclusive circle C1 in the radial direction. The center of the circle C3 is the same as the center of the minimum inclusive circle C1. The circle C3 and the region radially outward from the circle C3 are defined as the outer edge region S3. In other words, the outer edge region S3 is a region within X mm in the radial direction from the minimum inclusive circle C1. From the viewpoint of the water leakage suppression effect, it is preferable that the pressed portion E1 has a portion located in the outer edge region S3. From the viewpoint of the water leakage suppression effect, when there are multiple pressed portions E1, it is preferable that all pressed portions E1 have a portion located in the outer edge region S3. From the viewpoint of the water leakage suppression effect, it is more preferable that the pressed portion E1 is disposed only in the outer edge region S3. From the viewpoint of the water leakage suppression effect, the above-mentioned X is preferably 4.0 mm, more preferably 3.0 mm, more preferably 2.5 mm, and more preferably 2.0 mm. It is preferable that the circle C3 is located radially outward from the reference circle C2.

[0084] As shown in FIG. 9, the positioning protrusion 92 has a radially innermost position P4. The positioning protrusion 92 has a point or range located at the radially innermost position. The radial position of this point or range is the radially innermost position P4. This position P4 is located at the radially innermost position among the multiple positioning protrusions 92. As shown in FIG. 13, a circle that is concentric with the minimum inclusive circle C1 and passes through this radially innermost position P4 is the positioning reference circle C4. The region radially outward from the positioning reference circle C4 is defined as the peripheral region S4. The peripheral region S4 is a region radially outward from the radially innermost position P4. From the viewpoint of the water leakage suppression effect, it is preferable that the pressed portion E1 has a portion located in the peripheral region S4. From the viewpoint of the water leakage suppression effect, when there are multiple pressed portions E1, it is preferable that all pressed portions E1 have a portion located in the peripheral region S4. From the viewpoint of the water leakage suppression effect, it is more preferable that the pressed portion E1 is arranged only in the peripheral region S4. The positioning reference circle C4 may be located radially outward from the circle C3, may be located radially inward from the circle C3, or may be the same as the circle C3.

[0085] As described above, a surface overlap region R1 where the first smooth surface 52a and the second smooth surface 82a overlap is formed between the fixed valve body 52 and the movable platen 82 (see FIGS. 12(a) to (f)). The surface overlap region R1 changes depending on the position of the handle 14. That is, the surface overlap region R1 changes depending on the movement of the movable platen 82. If a gap is formed between the first smooth surface 52a and the second smooth surface 82a at the outer edge of the surface overlap region R1, water leakage will occur. The higher the contact pressure between the first smooth surface 52a and the second smooth surface 82a at the outer edge of the surface overlap region R1, the less likely water leakage will occur.

[0086] The surface overlap region R1 has an outer edge width W. The outer edge width W is the width of the outer edge of the surface overlap region R1. The outer edge width W is measured along the radial direction. Although the outer edge width W at several circumferential positions is shown in Figures 12(a) to (f) as an example, the outer edge width W is fixed at all circumferential positions. When the surface overlap region R1 changes with the movement of the movable platen 82, the outer edge width W also changes. Furthermore, the outer edge width W changes depending on the circumferential position.

[0087] The movable platen 82 has a circumferential position where the outer edge width W of the surface overlap region R1 is the minimum. This circumferential position is called the specific circumferential position. In FIG. 12 and other figures, the specific circumferential position is indicated by the symbol P2. The minimum value of the outer edge width W is determined in the entire movable range of the handle 14 in the left-right and up-down directions. That is, in determining the minimum value of the outer edge width W, the outer edge width W at every circumferential position in every movable position of the movable platen 82 is compared. In the above-mentioned first embodiment, the outer edge width W is the minimum value Wmin in the phases of FIG. 12(a) and FIG. 12(c). In this embodiment, the phase where the outer edge width W is the minimum value Wmin is the water stop state. In this embodiment, the circumferential position where the minimum value Wmin is reached in these two phases is the same, so there is one specific circumferential position P2. There may be more than one specific circumferential position P2. In the case where the portion where the outer edge width W is the minimum value Wmin has a width, the center position in the circumferential direction of this width can be set as the specific circumferential position P2.

[0088] FIG. 18 is a plan view of the movable platen 82 seen from above, similar to FIG. 14. As shown in FIG. 18, the movable platen 82 has a 60° circumferential region centered on the specific circumferential position P2. This region is called a specific circumferential region F1. The movable platen 82 has six regions divided every 60° in the circumferential direction, with the specific circumferential region F1 as the first region. These six regions are, in clockwise order when the movable platen 82 is seen from above, a first region G1, a second region G2, a third region G3, a fourth region G4, a fifth region G5, and a sixth region G6. The first region G1 is the specific circumferential region F1 and is the starting point of the clockwise direction.

[0089] The specific circumferential region F1 includes the specific circumferential position P2. At the specific circumferential position P2, the outer edge width W is at its minimum value Wmin, so water leakage is likely to occur. In the movable platen 82, the pressing protrusion 102 abuts against this specific circumferential region F1 (first region G1). That is, the pressed portion E1 is disposed in the specific circumferential region F1 (first region G1). Therefore, water leakage is effectively suppressed. The pressed portion E1 disposed in the specific circumferential region F1 does not extend to the outside of the specific circumferential region F1, but terminates within the specific circumferential region F1. Therefore, the pressing force is locally increased in the specific circumferential region F1, and water leakage is effectively suppressed.

[0090] The pressing protrusion 102 abuts against the specific circumferential position P2 of the movable platen 82. That is, the circumferential range of the pressed portion E1 includes the specific circumferential position P2. Therefore, water leakage is effectively suppressed.

[0091] In the movable platen 82, the pressing protrusion 102 abuts against the third region G3. That is, the pressed part E1 is disposed in the third region G3. Also, the pressing protrusion 102 abuts against the fifth region G5. That is, the pressed part E1 is disposed in the fifth region G5. By disposing the pressed parts E1 in the three regions G1, G3, and G5 that are distributed in the circumferential direction, the attitude of the movable platen 82 is effectively controlled when water pressure is applied, and water leakage is effectively suppressed. Also, this arrangement suppresses uneven distribution of the pressing force, improves the slidability of the movable platen 82, and can improve the operability of the handle 14.

[0092] In the movable platen 82, the pressing protrusion 102 abuts against the second region G2. That is, the pressed portion E1 is disposed in the second region G2. Also, the pressing protrusion 102 abuts against the sixth region G6. That is, the pressed portion E1 is disposed in the sixth region G6. By disposing the pressed portion E1 in each of the regions G1, G2, and G6 near the specific circumferential position P2, water leakage is effectively suppressed.

[0093] In the movable platen 82, the pressed portion E1 is disposed in each of five circumferentially distributed regions G1, G2, G3, G5, and G6, so that the attitude of the movable platen 82 is effectively controlled when water pressure is applied, and water leakage is effectively suppressed. In addition, this arrangement suppresses uneven distribution of the pressing force, improves the slidability of the movable platen 82, and can improve the operability of the handle 14.

[0094] In the movable platen 82, the pressing protrusions 102 abut against all six regions from the first region G1 to the sixth region G6. That is, the pressed parts E1 are arranged in all six regions from the first region G1 to the sixth region G6. With this configuration, the attitude of the movable platen 82 is effectively controlled when water pressure is applied, and water leakage is effectively suppressed. Furthermore, with this configuration, uneven distribution of the pressing force is suppressed, the slidability of the movable platen 82 is improved, and the operability of the handle 14 can be improved.

[0095] By distributing the pressed parts E1 (pressing protrusions 102) in the circumferential direction, the pressing force at the necessary circumferential position can be locally increased, and water leakage can be effectively suppressed. From this viewpoint, the pressed parts E1 (pressing protrusions 102) are preferably distributed at three or more locations in the circumferential direction, more preferably distributed at four or more locations in the circumferential direction, and even more preferably distributed at five or more locations in the circumferential direction. From the viewpoint of increasing the pressing force at each pressed part E1, the pressed parts E1 (pressing protrusions 102) may be distributed at 20 or less locations in the circumferential direction, further 15 or less locations, and further 10 or less locations. In the embodiment of FIG. 14, the pressed parts E1 are distributed at seven locations in the circumferential direction.

[0096] In Fig. 4, the double-headed arrow H indicates the height of the pressing protrusion 102. From the viewpoint of locally forming the pressed portion E1 by the pressing protrusion 102, the height H is preferably 0.10 mm or more, more preferably 0.12 mm or more, and more preferably 0.15 mm or more. If the height H is too large, the vertical length of the valve assembly 30 will increase, and the hot and cold water mixer 10 may become large. Furthermore, if the height H is too large, the height of the positioning protrusion 92 may also become excessive (see Fig. 9(b) etc.). From these viewpoints, from the viewpoint of vertical compression, the height H is preferably 7.0 mm or less, more preferably 6.0 mm or less, and more preferably 5.0 mm or less.

[0097] In Fig. 14, what is indicated by the double-headed arrow D is the radial width of the pressed portion E1 (pressing protruding portion 102). From the viewpoint of stably pressing the movable platen, the radial width D is preferably 0.5 mm or more, more preferably 1.0 mm or more, and more preferably 1.5 mm or more. From the viewpoint of locally pressing the radial outer side of the movable platen, the radial width D is preferably 7.0 mm or less, more preferably 6.0 mm or less, and more preferably 5.0 mm or less.

[0098] The number of pressing protrusions 102 is not limited. Furthermore, the circumferential length (circumferential angle) of one pressing protrusion 102 is not limited. For example, one pressing protrusion 102 that is continuous over the entire circumferential direction may be provided. The same applies to the pressed portion E1. The number of pressed portions E1 is not limited. Furthermore, the circumferential length of one pressed portion E1 is not limited. For example, one pressed portion E1 that is continuous over the entire circumferential direction may be formed.

[0099] In FIG. 14, the double-headed arrow θ indicates the circumferential angle of a single pressed portion E1 (pressing protrusion 102). As described above, the circumferential angle θ can be a maximum of 360°. For example, in FIG. 9(a), the pressing protrusion 102 (pressed portion E1) may be provided in the entire circumferential range where the positioning protrusion 92 does not exist. However, by reducing the circumferential angle θ, the pressed portion E1 (pressing protrusion 102) can be selectively arranged in a location where sealing performance is required. In addition, when the circumferential angle θ is small, the pressing area is reduced, and the pressing force per unit area can be increased. Furthermore, when the upper member 80 (disc cover 88, etc.) is molded from resin, the height of the pressing protrusion 102, etc. can be finely adjusted in consideration of resin deformation during molding by reducing the circumferential angle θ. From these viewpoints, the circumferential angle θ is preferably 30° or less, more preferably 20° or less, and more preferably 15° or less. In respect of stably pressing the movable platen, the circumferential angle θ is preferably equal to or greater than 1°, preferably equal to or greater than 3°, more preferably equal to or greater than 5°, and still more preferably equal to or greater than 7°.

[0100] The movable platen is preferably made of ceramics (fine ceramics). A movable platen made of ceramics has particularly high rigidity and has been treated as a substantially rigid body. In the present invention, it has been found that even if the material is ceramics, water leakage can be effectively suppressed due to extremely small deformation caused by the arrangement of the pressed portion E1. From the viewpoints of rigidity, strength, water pressure resistance, and wear resistance, alumina or silicon carbide is preferable as the ceramic material. An abrasion-resistant layer (e.g., an amorphous carbon layer) may be formed on the sliding contact surface.

[0101] From the viewpoints of rigidity, strength, water pressure resistance, and wear resistance, the fixed valve body is preferably made of ceramics (fine ceramics). The ceramic material is preferably alumina or silicon carbide. A wear-resistant layer (e.g., an amorphous carbon layer) may be formed on the sliding surface. The material of the fixed valve body may be the same as that of the movable platen.

[0102] Examples of the material of the disc cover include metal and resin. This resin also includes fiber-reinforced resin. From the viewpoint of moldability, resin is preferable. In particular, when the disc cover has pressing protrusions, the pressing protrusions can be molded with high precision by using resin as the material. In this case, fine adjustment of the height H of each pressing protrusion is also easy. From the viewpoint of sliding with the rotating body 44, polyacetal is preferable as this resin. EXAMPLES

[0103] [Example] The same valve assembly as in the first embodiment was produced. The disc cover 88 was made of polyacetal and produced by cutting. The height H of the pressing protrusion 102 was 0.15 mm. The fixed valve body 52 and the movable platen 82 were made of fine ceramics (alumina) and produced by pressing, sintering and grinding. These and other components were assembled to produce the valve assembly of the example.

[0104] [Comparative Example 1] 19(a) shows a bottom view of the disc cover according to Comparative Example 1. In this disc cover, the pressing protrusion 102 was not formed. The position corresponding to the pressing protrusion 102 was replaced with a flat lower surface 104. Apart from this, the disc cover and valve assembly of Comparative Example 1 was obtained in the same manner as in Example 1.

[0105] [Comparative Example 2] Fig. 19(b) shows a bottom view of the disc cover according to Comparative Example 2. In this disc cover, a pressing protrusion 103 was formed instead of the pressing protrusion 102. The protrusion 103 was formed along the through hole constituting the lever engagement portion 84. The height of the pressing protrusion 103 was 0.15 mm, the same as the height H of the example. Aside from this point, the disc cover and valve assembly of Comparative Example 2 was obtained in the same manner as the example.

[0106] A water leakage test was carried out using the valve assemblies of the embodiment, comparative example 1, and comparative example 2. The static water pressure was set to 1.0 MPa, and the water stop state shown in FIG. 12(c) was maintained for 15 minutes to confirm the state of water leakage. As a result, in the embodiment, water leakage from the boundary between the movable valve body 50 and the fixed valve body 52 was not observed. On the other hand, in comparative example 1 and comparative example 2, water leakage from the boundary between the movable valve body 50 and the fixed valve body 52 occurred. In comparative example 1, the leaked water was thinly accumulated to a degree that did not reach the point of forming water droplets. In comparative example 2, the leaked water was accumulated to a degree that formed water droplets. Thus, water leakage was suppressed in the embodiment compared to comparative example 1 and comparative example 2. Moreover, in comparative example 2, in which the pressing convex part of the disk cover is present on the central side (radially inward) from the flow passage forming concave part, more water leakage occurred than in comparative example 1, in which the pressing convex part is not present. From these results, it is clear that water leakage can be suppressed depending on the position of the pressed part. In addition, taking into consideration the fact that the results of Comparative Example 2 were worse than those of Comparative Example 1, it was found that the movable valve body, which was considered to be substantially rigid, was extremely deformed. These results demonstrate the superiority of the present disclosure.

[0107] Regarding the above-described embodiment, the following notes are disclosed. [Appendix 1] A fixed valve body having a hot water supply hole, a cold water supply hole, and a drain hole; a movable valve body having a flow passage forming recess and sliding on the fixed valve body; A handle that is operated to move the movable valve body; A lever shaft that is linked to the handle; Equipped with the movable valve body has a movable platen that contacts the fixed valve body and an upper member that is disposed above the movable platen, the upper member is a disk cover that is fixed to the movable platen and engages with the lever shaft, the movable platen has a recessed portion that does not penetrate the movable platen, and the recessed portion constitutes the flow path forming recessed portion, In the movable platen, when the area radially outside the flow path forming recess is defined as the outer area, the disk cover protrudes downward and has a pressing protrusion that presses the outer area downward. [Appendix 2] The hot and cold water mixing faucet according to claim 1, wherein the pressing protrusion presses only the outer region downward. [Appendix 3] When a region radially outward from a radially outermost position of the flow passage forming recess is defined as an outermost peripheral region, The hot and cold water mixing faucet according to claim 1, wherein the pressing convex portion presses only the outermost peripheral region downward. [Appendix 4] A fixed valve body having a hot water supply hole, a cold water supply hole, and a drain hole; a movable valve body having a flow passage forming recess and capable of sliding on the fixed valve body; A handle that is operated to move the movable valve body; Equipped with the movable valve body has a movable platen that contacts the fixed valve body and an upper member that is disposed above the movable platen, the movable platen has a pressed portion that is pressed downward by the upper member, A hot and cold water mixing valve in which, when a region radially outward from the flow passage forming recess is defined as an outer region, the pressed portion is formed only in the outer region. [Appendix 5] The movable platen has a through hole penetrating the movable platen, A hot and cold water mixing faucet as described in Appendix 4, wherein the through hole is blocked from above by the upper member, thereby forming the flow path forming recess in the movable valve body. [Appendix 6] The hot and cold water mixing faucet according to claim 4, wherein the movable plate has a recess that does not penetrate the movable plate, and this recess constitutes the flow path forming recess. [Appendix 7] When a region radially outward from a radially outermost position of the flow passage forming recess is defined as an outermost peripheral region, A hot and cold water mixer tap according to any one of claims 4 to 6, wherein the pressed portion is formed only in the outermost peripheral region. [Appendix 8] The upper member has a plurality of positioning protrusions protruding toward the movable platen, the movable platen has a plurality of positioning recesses which engage with the plurality of positioning protrusions, A hot and cold water mixing faucet described in any one of Appendices 4 to 7, wherein when the area radially outward from the radially innermost position of the positioning protrusion is considered to be the peripheral area, the pressed portion is arranged only in the peripheral area. [Appendix 9] the upper member has a pressing protrusion that protrudes downward and presses the outer region downward, A hot and cold water mixer tap according to any one of appendices 4 to 8, wherein the portion pressed by the pressing convex portion is the pressed portion. [Appendix 10] A hot and cold water mixer tap according to any one of claims 1 to 9, wherein the movable plate is formed of ceramics. [Appendix 11] A first smooth surface is formed on the upper surface of the fixed valve body, a second smooth surface overlapping the first smooth surface is formed on a lower surface of the movable platen, A surface overlap region where the first smooth surface and the second smooth surface overlap each other is changed by the movement of the movable platen, the movable platen has a specific circumferential position that is a circumferential position at which an outer edge width of the surface overlap region is minimum, A hot and cold water mixing faucet as described in any one of Appendices 4 to 9, wherein when a region of 60° in the circumferential direction centered on the specific circumferential position is defined as a specific circumferential region, the pressed portion is located in the specific circumferential region. [Appendix 12] A hot and cold water mixer tap according to any one of claims 4 to 9, wherein the pressed portions are distributed and arranged at three or more locations in the circumferential direction.

[0108] This application also describes other inventions not included in the inventions described in the claims (including independent claims). Each form, member, configuration, and combination thereof described in the claims and embodiments of this application are recognized as inventions based on the effects that each has.

[0109] Each of the forms, components, configurations, etc. shown in each of the above embodiments may be individually applied to all of the inventions described in this application, including the inventions claimed in this application, even if not all of the forms, components, or configurations of these embodiments are included. [Explanation of symbols]

[0110] 10...Hot water mixer faucet 14···Handle 16...Discharge part 20 Head 30... Valve assembly 42. Housing 44 Rotating body 46 Lever shaft 48 Lever shaft fixing pin 50, 150, 250... Movable valve body 52 Fixed valve body 52a: First smooth surface (upper surface of fixed valve body) 54... Packing 80, 180, 280...Upper member 82, 182, 282, 382...Movable plate 82a, 182a, 282a...Second smooth surface (lower surface of movable platen) 82b, 182b, 282b, 382b...Top surface of movable platen 84 Lever engagement part 88, 188, 288...Disc cover 92 Disc cover positioning protrusion 96... Movable platen positioning recess 100, 200, 300, 400... Flow path forming recess 100a, 200a, 300a... Lower opening edge of flow passage forming recess 102 Pressing protrusion 186...intervening member 383...Through hole C1...Minimum enclosing circle E1 Pressed part S1...outer area S2...Outermost area S3: Outer region R1: The surface overlap area where the first smooth surface and the second smooth surface overlap

Claims

1. A fixed valve body having a hot water supply hole, a cold water supply hole, and a drain hole; a movable valve body having a flow passage forming recess and sliding on the fixed valve body; A handle that is operated to move the movable valve body; A lever shaft that is linked to the handle; Equipped with the movable valve body has a movable platen that contacts the fixed valve body and an upper member that is disposed above the movable platen, the upper member is a disk cover that is fixed to the movable platen and engages with the lever shaft, the movable platen has a recessed portion that does not penetrate the movable platen, and the recessed portion constitutes the flow path forming recessed portion, In the movable platen, when the area radially outside the flow path forming recess is defined as the outer area, the disk cover protrudes downward and has a pressing protrusion that presses the outer area downward.

2. The hot and cold water mixing valve according to claim 1 , wherein the pressing protrusion presses downward only the outer region.

3. When a region radially outward from a radially outermost position of the flow passage forming recess is defined as an outermost peripheral region, The hot and cold water mixer tap according to claim 1, wherein the pressing protrusion presses only the outermost peripheral region downward.

4. A fixed valve body having a hot water supply hole, a cold water supply hole, and a drain hole; a movable valve body having a flow passage forming recess and capable of sliding on the fixed valve body; A handle that is operated to move the movable valve body; Equipped with the movable valve body has a movable platen that contacts the fixed valve body and an upper member that is disposed above the movable platen, the movable platen has a pressed portion that is pressed downward by the upper member, A hot and cold water mixing valve in which, when a region radially outward from the flow passage forming recess is defined as an outer region, the pressed portion is formed only in the outer region.

5. The movable platen has a through hole penetrating the movable platen, The hot and cold water mixing valve according to claim 4, wherein the through hole is blocked from above by the upper member, thereby forming the flow passage forming recess in the movable valve body.

6. The hot and cold water mixing valve according to claim 4, wherein the movable plate has a recess that does not penetrate the movable plate, and this recess constitutes the flow path forming recess.

7. When a region radially outward from a radially outermost position of the flow passage forming recess is defined as an outermost peripheral region, The hot and cold water mixer tap according to claim 4, wherein the pressed portion is formed only in the outermost peripheral region.

8. The upper member has a plurality of positioning protrusions protruding toward the movable platen, the movable platen has a plurality of positioning recesses which engage with the plurality of positioning protrusions, A hot and cold water mixing faucet as described in any one of claims 4 to 7, wherein when the area radially outward from the radially innermost position of the positioning protrusion is defined as a peripheral area, the pressed portion is arranged only in the peripheral area.

9. the upper member has a pressing protrusion that protrudes downward and presses the outer region downward, The hot and cold water mixing valve according to claim 8, wherein the portion pressed by the pressing protrusion is the pressed portion.

10. The hot and cold water mixing valve according to any one of claims 1 to 7, wherein the movable plate is made of ceramics.

11. a first smooth surface is formed on an upper surface of the fixed valve body, a second smooth surface overlapping the first smooth surface is formed on a lower surface of the movable platen, A surface overlap region where the first smooth surface and the second smooth surface overlap each other is changed by the movement of the movable platen, the movable platen has a specific circumferential position that is a circumferential position at which an outer edge width of the surface overlap region is minimum, A hot and cold water mixing faucet as described in any one of claims 4 to 7, wherein when a region of 60° in the circumferential direction centered on the specific circumferential position is defined as a specific circumferential region, the pressed portion is located in the specific circumferential region.

12. The hot and cold water mixer tap according to any one of claims 4 to 7, wherein the pressed portions are disposed in three or more locations in a circumferential direction.

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