JP2017106558A - Thermostatic mixing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermostatic mixing valve capable of dispensing with pressing force between a stationary valve body and a stationary valve lower member, and capable of preventing contact pressing force between the stationary valve body and a movable valve body from becoming excessive.SOLUTION: A thermostatic mixing valve 10 includes a stationary valve body 520, a movable valve body 250, a lower case 380, and a lever 160 capable of rotating in a right-left direction and a front-back direction and capable of operating the movable valve body. By change of a rotational position in the right-left direction of the lever 160, a thermostatic mixing rate can be adjusted, and by change of a rotational position in the front-back direction of the lever 160, a discharge amount can be adjusted. The stationary valve body 520 includes a stationary valve body 280 contacting with the movable valve body 250, a stationary valve lower member 360 positioned on a lower side of the stationary valve body 280, and a stationary valve holding member 260 connecting the stationary body 280 and the stationary valve lower member 360.SELECTED DRAWING: Figure 24

Description

  The present invention relates to a hot and cold water mixing tap.

  There is known a single lever type hot and cold water mixing tap in which a discharge amount and a mixing ratio of hot water and water can be adjusted by operating a lever. In this hot and cold water mixing tap, the mixing ratio of hot water and water can be adjusted by turning the lever left and right (turning operation), and the discharge amount can be adjusted by turning the lever back and forth (turning up and down).

  This hot and cold water mixing tap has a movable valve body and a fixed valve body. By operating the lever, the movable valve element moves relative to the fixed valve element. This movement includes movement (translation) and rotation. The above-described adjustment is achieved by this movement. In this hot and cold water mixing tap, a contact pressing force (seal pressure) is applied between the movable valve body and the fixed valve body. This contact pressing force contributes to prevention of water leakage from between the movable valve body and the fixed valve body.

  Japanese Utility Model Publication No. 6-85974 discloses a water faucet provided with a seal ring made of an elastic material that seals a flow path to a fixed valve plate, and a spring that biases the seal ring toward the fixed valve plate. Japanese Patent Laying-Open No. 2003-28320 discloses a water faucet in which a seal member inside a valve unit is elastically deformed by a screwing force of a housing cap onto an upper portion of a housing.

Japanese Utility Model Publication No. 6-85974 JP 2003-28320 A

  In the prior art, the downward pressure on the fixed valve due to water pressure is greater than the upward pressure on the fixed valve due to water pressure. For this reason, the compression of the packing is increased, the upward pressure applied to the fixed valve by the packing is increased, and the fixed valve is pressed toward the movable valve. Aging and stress relaxation occur in the packing. In addition, the pressing force by the packing can also change due to manufacturing errors (dimensional errors and physical property errors) of the peripheral members of the packing.

  The packing is compressed both in the still water state and in the water discharge state. Thereby, permanent distortion of the packing is promoted, and the upward pressure applied to the fixed valve by packing compression is reduced. As a result, the sealing pressure is insufficient in the water discharge state, the water tightness between the fixed valve and the movable valve is lowered, and water leakage is likely to occur. In addition, as the time is longer and the packing compression degree is larger, the compressive strain of the packing tends to increase.

  In the packing, physical properties change due to changes over time, and even if it is assumed that the dimensions do not change and there is no permanent distortion, the upward pressure applied to the fixed valve by the packing is reduced, which can also cause water leakage.

  Considering the pressure drop due to these packings, as the initial pressure by packing, in addition to the force required for the seal pressure, an extra pressing force was required in anticipation of the pressure drop caused by packing. . Furthermore, it is necessary to set a larger initial pressing force in consideration of the downward pressure applied to the fixed valve due to water pressure and the increase in the downward pressure during secondary water stoppage.

  When the hot / cold mixer tap is not used for a certain period of time and then used, the fixed valve and the movable valve may be fixed (linked) and the lever may become difficult to operate. In the case of the prior art, this linking is likely to occur even during the unused period because the upward pressure applied to the fixed valve by packing compression is large.

  In the prior art, since the upward pressure applied to the fixed valve due to the packing compression is large, the operation force for lever left-right rotation and front-back rotation increases. As a result, the operability tends to deteriorate. In addition, the wear of the sliding surfaces of the fixed valve and the movable surface tends to increase.

  As a countermeasure to these problems, it is conceivable to adjust the balance of the pressure receiving area by water pressure so that the fixed valve body is pressed against the movable valve body by water pressure. In this case, it is necessary to provide a pressure receiving surface that receives an upward force on the fixed valve body. For this purpose, it is preferable to provide a fixed valve lower member having the pressure receiving surface under the fixed valve body. In this configuration, it is necessary to ensure a sealing property between the fixed valve main body and the fixed valve lower member. This sealing performance can be achieved by pressing the fixed valve body against the fixed valve lower member, but this pressing force is transmitted as a force pressing the fixed valve body against the movable valve body. For this reason, the contact pressing force becomes excessive, and the above-mentioned linking and sliding surface wear may occur.

  An object of the present invention is to provide a hot and cold water mixing plug that eliminates the need for a pressing force between a fixed valve body and a fixed valve lower member and prevents an excessive contact pressing force between the fixed valve body and the movable valve body. On offer.

  A preferred hot and cold water mixing tap according to the present invention includes a fixed valve body, a movable valve body that can slide on the fixed valve body, a lower case provided on the lower side of the fixed valve body, And a lever that can be rotated back and forth and that can operate the movable valve body. The mixing ratio of hot and cold water can be adjusted by changing the left and right pivot position of the lever. The amount of discharge can be adjusted by changing the front-rear rotation position of the lever. The fixed valve body is a fixed valve body that contacts the movable valve body, a fixed valve lower member located below the fixed valve body, and a fixed valve that connects the fixed valve body and the fixed valve lower member. Holding member.

  Preferably, a first seal member is provided between the fixed valve body and the fixed valve lower member.

  Preferably, the fixed valve holding member has axially extending portions arranged at a plurality of locations in the circumferential direction. Preferably, the axially extending portion has a facing surface portion facing in the vertical direction at a predetermined facing distance. Preferably, the fixed valve body and the fixed valve lower member are sandwiched between the facing surface portions.

  Preferably, the fixed valve main body has first projecting portions that are provided at a plurality of locations in the circumferential direction and project radially outward. Preferably, the fixed valve lower member has second projecting portions provided at a plurality of locations in the circumferential direction and projecting radially outward. Preferably, an overlapping body is formed in which the fixed valve main body and the fixed valve lower member are overlapped in a state where the circumferential positions of the first protrusion and the second protrusion coincide with each other. Preferably, the overlapping body includes protruding overlapping portions that are configured by the first protruding portion and the second protruding portion and are arranged at a plurality of locations in the circumferential direction. Preferably, the opposing surface portion includes a first end in the circumferential direction, a second end in the circumferential direction, a first portion in which the opposing distance is gradually increased as the opposing surface portion approaches the first end in the circumferential direction, and the first portion. And a second portion provided between the second end in the circumferential direction and sandwiching the protruding overlapping portion. Preferably, the overlapping body and the fixed valve holding member are prepared in a state where the protruding overlapping portions and the axially extending portions are alternately arranged in the circumferential direction, and the protruding overlapping portions and the axially extending portions. Thus, it is possible to make mutual transition with the assembled state having the same circumferential position. Preferably, in the transition from the preparation state to the assembly state, the protruding overlapped portion is configured to pass through the first portion and be disposed in the second portion.

  Preferably, the axially extending portion extends downward. Preferably, a first engaging portion is provided at the lower end of the axially extending portion. Preferably, the lower case has a second engagement portion that engages with the first engagement portion.

  The upward force that the fixed valve lower member receives due to water pressure is FA, and the downward force that the fixed valve lower member receives due to water pressure is FB. Preferably, the force FA is greater than the force FB regardless of the left-right rotation position and the front-rear rotation position of the lever.

  The pressing force between the fixed valve main body and the fixed valve lower member can be eliminated, and the contact pressing force between the fixed valve body and the movable valve body can be prevented from becoming excessive.

FIG. 1 is a perspective view of a hot and cold water mixing tap according to the first embodiment. FIG. 2 is a side view of the valve assembly according to the first embodiment. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an exploded perspective view of the valve assembly of FIG. 5A is a perspective view of the upper case, FIG. 5B is a side view of the upper case, and FIG. 5C is a cross-sectional view of the upper case. 6 (a) and 6 (b) are perspective views of the fixed valve holding member. FIG. 7A is a plan view of the fixed valve holding member, and FIG. 7B is a bottom view of the fixed valve holding member. 8A is a side view of the fixed valve holding member, and FIG. 8B is a cross-sectional view taken along the line AA in FIG. FIG. 9 is a cross-sectional view taken along the line BB in FIG. FIG. 10A and FIG. 10B are perspective views of the fixed valve main body. FIG. 11A is a plan view of the fixed valve body, and FIG. 11B is a bottom view of the fixed valve body. Fig.12 (a) is a side view of a stationary valve main body, FIG.12 (b) is sectional drawing along the AA of Fig.11 (a). FIG. 13A and FIG. 13B are perspective views of the fixed valve lower member. FIG. 14A is a plan view of the fixed valve lower member, and FIG. 14B is a bottom view of the fixed valve lower member. 15A is a side view of the fixed valve lower member, and FIG. 15B is a cross-sectional view taken along the line AA in FIG. 14B. 16 (a) and 16 (b) are perspective views of the lower case. FIG. 17A is a plan view of the lower case, and FIG. 17B is a bottom view of the lower case. 18 (a) is a side view of the lower case, FIG. 18 (b) is a cross-sectional view taken along the line AA in FIG. 18 (a), and FIG. 18 (c) is a cross-sectional view of FIG. It is sectional drawing along the AA line. FIG. 19 is a perspective view of the lower part. FIG. 20 is a plan view of the lower part. FIG. 21A is a side view of the lower portion, and FIG. 21B is a cross-sectional view taken along line AA in FIG. FIG. 22A is a side view of the lower part viewed from another angle, and FIG. 22B is a cross-sectional view taken along line AA in FIG. FIG. 23 is a perspective view showing the lower surface of the fixed valve lower member. FIG. 24 is a view for explaining the assembly process of the fixed valve body. FIG. 25 is a plan view showing an example of the overlap between the valve holes in the valve hole water stop state. FIG. 26 is a plan view showing an example of the overlap between the valve holes in the valve hole circulation state. FIG. 27 is a partially enlarged view of FIG.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  In the present application, the axial direction, the radial direction, and the circumferential direction are defined based on the outer circumferential surface of the upper case 120 (described later). In order to facilitate understanding, in the present application, it is assumed that the axial direction coincides with the vertical direction (vertical direction), and “upper”, “upper”, “upper”, “lower”, “lower”, “lower”, etc. Is used. However, in the actual usage pattern, the axial direction may not coincide with the vertical direction.

  FIG. 1 is a perspective view of a hot and cold water mixing tap 10 according to an embodiment of the present invention. The hot and cold water mixing tap 10 includes a main body 12, a handle 14, a discharge part 16, a hot water introduction pipe 18, a water introduction pipe 20 and a discharge pipe 22. The ejection unit 16 has a head 24. The head 24 can switch between shower discharge and normal discharge. The hot and cold water mixing tap 10 is used in a sink, a wash basin, or the like, for example.

  The discharge amount is adjusted by rotating the handle 14 up and down. In the present embodiment, the discharge amount increases as the handle 14 is moved upward. Moreover, the mixing ratio of hot water and water changes by the left-right rotation of the handle 14. The water discharge temperature can be adjusted by turning the handle 14 left and right. The discharge part 16 has a built-in water purification cartridge. A raw water channel and a purified water channel are formed inside the discharge unit 16. In the hot-water mixing tap 10, switching between the raw water flow path and the purified water flow path is possible. When the raw water flow path is selected, raw water that does not pass through the water purification cartridge is discharged from the head 24. When the purified water flow path is selected, the purified water that has passed through the purified water cartridge is discharged from the head 24. The hot-water mixing tap 10 has a switching button 26 for switching between the raw water channel and the purified water channel (see FIG. 1).

  2 is a side view of the valve assembly 100, and FIG. 3 is a cross-sectional view of the valve assembly 100 taken along line AA of FIG. FIG. 4 is an exploded perspective view of the valve assembly 100.

  The valve assembly 100 is disposed inside the main body 12. The handle 14 is fixed to a lever 160 (described later) by screws (not shown). In the hot and cold water mixing tap 10, the valve assembly 100 is replaceable.

  The valve assembly 100 includes an upper case 120, a seal member s 1, a lever 160, a lever shaft 180, and a rotating body 200. The lever shaft 180 passes through the shaft hole 162 of the lever 160 and the shaft hole 202 of the rotating body 200. The lever 160 can rotate around the lever shaft 180. This rotation is the front-rear rotation of the lever 160 and corresponds to the vertical rotation of the handle 14. The lever 160 rotates together with the rotating body 200. This rotation is a left-right rotation of the lever 160 and corresponds to a left-right rotation of the handle 14.

  The valve assembly 100 includes a movable valve upper member 220 and a movable valve main body 240. The material of the movable valve upper member 220 is resin. The material of the movable valve body 240 is ceramic.

  The movable valve upper member 220 is fixed on the upper side of the movable valve main body 240. The movable valve upper member 220 has a downward extending portion 224 (see FIG. 4). The movable valve main body 240 has an engagement recess 244. The downward extending part 224 has an engaging convex part. Concave and convex engagement is formed between the downward extending portion 224 and the engaging recess 244. The movable valve upper member 220 and the movable valve main body 240 are coupled by this uneven engagement.

  The movable valve upper member 220 and the movable valve main body 240 move integrally. A movable valve body 250 is configured by the movable valve upper member 220 and the movable valve main body 240. The movable valve body 250 may be constituted only by the movable valve main body 240. The movable valve body 250 (movable valve main body 240) can slide on a fixed valve body 520 (described later).

  The movable valve upper member 220 has a recess 222. As shown in FIG. 3, the lower end portion of the lever 160 enters the recess 222. The lower end of the lever 160 is engaged with the recess 222. The movable valve upper member 220 is slidably engaged with the lower surface of the rotating body 200. Due to these engagements, the movable valve body 240 (movable valve body 250) translates as the lever 160 rotates back and forth. Further, the movable valve main body 240 rotates together with the rotating body 200. As a result, the movable valve body 240 (movable valve body 250) is rotated by the left-right rotation of the lever 160.

  The lower surface of the movable valve main body 240 has a flow path forming recess 242. As the movable valve body 250 (movable valve main body 240) moves, the flow path forming recess 242 moves on the fixed valve main body 280. With the rotation of the movable valve body 250 (movable valve main body 240), the flow path forming recess 242 rotates on the fixed valve main body 280. Moreover, the lower surface of the movable valve main body 240 has a smooth surface PL1.

  The valve assembly 100 includes a fixed valve holding member 260. The fixed valve holding member 260 holds a fixed valve main body 280 and a fixed valve lower member 360 (described later).

  The valve assembly 100 has a fixed valve body 280. The fixed valve main body 280 is in contact with the movable valve main body 240 (movable valve body 250). In the present application, this contact pressure is also referred to as a contact pressing force. The material of the fixed valve body 280 is ceramic. The upper surface of the fixed valve body 280 has a smooth surface PL2. The smooth surface PL2 is in contact with the smooth surface PL1. By the contact pressing force, water leakage from between the movable valve main body 240 and the fixed valve main body 280 is prevented.

  The fixed valve main body 280 has a hot water valve hole 300, a water valve hole 320, and a discharge valve hole 340. Each of the hot water valve hole 300, the water valve hole 320, and the discharge valve hole 340 is a through hole.

  The valve assembly 100 includes a fixed valve lower member 360. The material of the fixed valve lower member 360 is resin. The fixed valve lower member 360 is provided below the fixed valve main body 280. The fixed valve lower member 360 is in contact with the lower surface of the fixed valve main body 280. The fixed valve lower member 360 is fixed to the lower side of the fixed valve main body 280. Note that the fixed valve lower member 360 may not be provided.

  The fixed valve lower member 360 has a hot water passage hole 362, a water passage hole 364, and a water discharge passage hole 366. Each of the hot water passage hole 362, the water passage hole 364, and the water discharge passage hole 366 is a through hole.

  The valve assembly 100 has a lower case 380. The lower case 380 is provided below the fixed valve lower member 360. The lower case 380 has a hot water introduction hole 382, a water introduction hole 384, and a water discharge hole 386. Each of the hot water passage hole 362, the water passage hole 364, and the water discharge passage hole 366 is a through hole. The above-described upper case 120 is fixed to the lower case 380. This fixing is achieved by uneven engagement. The upper case 120 has an engaging portion 122. The engagement part 122 is an engagement hole. The lower case 380 has an engaging portion 388. The engaging part 388 is an engaging convex part. The upper case 120 is fixed to the lower case 380 by the engagement between the engagement portion 122 and the engagement portion 388.

  The valve assembly 100 has a seal member s2. In order to distinguish from other seal members, this seal member s2 is also referred to as a first seal member. The first seal member s2 is disposed on the upper side of the fixed valve lower member 360. The first seal member s2 is an annular seal member. The first seal member s2 is an O-ring.

  The first seal member s2 ensures water tightness between the fixed valve main body 280 and the fixed valve lower member 360. The first seal member s2 is compressed in the axial direction. The number of first seal members s2 is three. As the first seal member s2, a first seal member s21 for a hot water channel, a first seal member s22 for a water channel, and a first seal member s23 for a discharge channel are provided. In the present embodiment, the first seal member s2 is disposed so as to be compressed in the axial direction between the fixed valve main body 280 and the fixed valve lower member 360, but the first seal member s2 is disposed in the radial direction. The watertightness between the fixed valve main body 280 and the fixed valve lower member 360 may be ensured by compressing in the radial direction of the first seal member s2; For example, a portion provided between the portion provided on the fixed valve main body 280 and provided with a side surface extending in the vertical direction and the portion provided on the fixed valve lower member 360 and provided with a side surface extending in the vertical direction. One seal member s2 may be provided to compress the first seal member s2 in the radial direction. The first seal member s2 is compressed in the axial direction from the viewpoint of improving water tightness and suppressing the complexity of the shapes of the fixed valve main body 280 and the fixed valve lower member 360 and the accompanying cost increase. The structure which ensures the watertightness between the main body 280 and the fixed valve lower member 360 is preferable.

  The first seal member s21 is provided at the joint between the hot water valve hole 300 and the hot water passage hole 362. The first seal member s22 is provided at the joint between the water valve hole 320 and the water passage hole 364. The first seal member s23 is provided at the joint between the discharge valve hole 340 and the water discharge passage hole 366.

  The valve assembly 100 includes a seal member s3. In order to distinguish from other seal members, this seal member s3 is also referred to as a second seal member. The second seal member s3 is disposed below the fixed valve lower member 360. The second seal member s3 is an annular seal member. The second seal member s3 is an O-ring.

  The second seal member s3 ensures water tightness between the fixed valve lower member 360 and the lower case 380. The second seal member s3 is compressed in a direction perpendicular to the axial direction (axial vertical direction). The second seal member s3 is compressed in the radial direction of the second seal member s3. The number of second seal members s3 is three. As the second seal member s3, a second seal member s31 for the hot water channel, a second seal member s32 for the water channel, and a second seal member s33 for the discharge channel are provided.

  The second seal member s31 is provided at the joint between the hot water passage hole 362 and the hot water introduction hole 382. The second seal member s32 is provided at the joint between the water passage hole 364 and the water introduction hole 384. The second seal member s33 is provided at a joint between the water discharge passage hole 366 and the water discharge hole 386.

  The valve assembly 100 includes an elastic body 420 that urges the fixed valve lower member 360 upward. The number of elastic bodies 420 is three. In the present embodiment, the elastic body 420 is a coil spring. The elastic body 420 is a metal spring. As the elastic body (spring) 420, a first spring (first elastic body) 422, a second spring (second elastic body) 424, and a third spring (third elastic body) 426 are provided. The three elastic bodies 420 are evenly distributed in the circumferential direction. The upper end of the elastic body 420 is in contact with the fixed valve lower member 360. The lower end of the elastic body 420 is in contact with the lower case 380. The elastic body 420 is not in contact with the second seal member s3. The elastic body 420 is not in contact with any sealing member.

  The valve assembly 100 includes a seal member s4 and a seal member s5. These seal members s4 and s5 ensure the water tightness between the valve assembly 100 and the connecting portion below it.

  5 (a) is a perspective view of the upper case 120, FIG. 5 (b) is a side view of the upper case 120, and FIG. 5 (c) is a cross section taken along the line AA in FIG. 5 (b). FIG. The upper case 120 has an extending portion 124 that extends downward. A plurality (three) of extending portions 124 are provided. These extending portions 124 are arranged at equal intervals in the circumferential direction. A missing recess 126 is formed between adjacent extending portions 124. A plurality of (three) missing recesses 126 are provided. Each of the extending portions 124 has an engaging portion (engaging hole) 122. As described above, the engagement hole 122 engages with the engagement portion (engagement convex portion) 388 of the lower case 380. The axial dimension inside the valve assembly 100 is determined by the engagement between the upper case 120 and the engaging projection 388.

  An engaging convex portion 128 is provided on the lower edge of the upper case 120. An engaging convex portion 128 is provided on each of the extending portions 124. The engaging convex portion 128 is engaged with the engaging concave portion 390 of the lower case 380.

  6A is a perspective view of the fixed valve holding member 260 as viewed from above, and FIG. 6B is a perspective view of the fixed valve holding member 260 as viewed from below. FIG. 7A is a plan view of the fixed valve holding member 260, and FIG. 7B is a bottom view of the fixed valve holding member 260. 8A is a side view of the fixed valve holding member 260, and FIG. 8B is a cross-sectional view taken along the line AA in FIG. 7A. FIG. 9 is a cross-sectional view taken along the line BB in FIG.

  The fixed valve holding member 260 has an annular coupling part 262 and an axially extending part 264. The axially extending portions 264 are provided at a plurality of locations in the circumferential direction. The axially extending portion 264 extends (projects) downward. Moreover, as shown in FIG. 7A, the axially extending portion 264 protrudes radially outward. A plurality (three) of axially extending portions 264 are provided. The plurality of axially extending portions 264 are equally arranged in the circumferential direction. The annular coupling portion 262 extends along the circumferential direction. The ring connecting portion 262 connects the axially extending portions 264 to each other. The annular connecting portions 262 are equally arranged in the circumferential direction. The annular connection portions 262 are dispersed in a plurality (three) in the circumferential direction.

  As shown in the sectional view of FIG. 8B, the axially extending portion 264 has an upper portion 266, an intermediate portion 268, and a lower portion 270. The upper portion 266 extends from the intermediate portion 268 so as to protrude radially inward. The upper part 266 extends radially inward from the upper edge of the intermediate part 268. The lower portion 270 extends from the intermediate portion 268 so as to protrude radially inward. The lower portion 270 extends radially inward from the lower edge of the intermediate portion 268. The inner surface and the outer surface of the intermediate portion 268 are circumferential surfaces. The upper part 266 and the lower part 270 face each other.

  An engaging portion 272 is provided at the lower end (lower surface) of the axially extending portion 264. The engaging part 272 is a protrusion. In order to distinguish from other engaging parts, the engaging part 272 is also referred to as a first engaging part. The first engaging portion 272 protrudes downward. In the present embodiment, two first engaging portions 272 are provided per one axially extending portion 264. In the present embodiment, the total number of first engaging portions 272 is six.

  In the axially extending portion 264, the lower surface of the upper portion 266 and the upper surface of the lower portion 270 form an opposing surface portion 274 that faces in the up-down direction. The axially extending portion 264 has this facing surface portion 274. Each of the axially extending portions 264 has the facing surface portion 274.

  As shown in FIG. 9, each of the intermediate portions 268 (opposing surface portion 274) has a circumferential first end T1 and a circumferential second end T2. The circumferential first end T1 is one end in the circumferential direction. The circumferential second end T2 is the other end in the circumferential direction. The circumferential first end T <b> 1 is opened in the circumferential direction on the radially inner surface side of the intermediate portion 268. A longitudinal rib st1 is provided at the circumferential second end T2. A vertical rib st1 is provided on the radially inner side surface of the intermediate portion 268 only at the circumferential second end T2. The longitudinal rib st1 is not provided at the circumferential first end T1. In the axial direction, the vertical rib st <b> 1 extends from the upper part 266 to the lower part 270. Due to the presence of the longitudinal rib st1, the circumferential second end T2 is not opened in the circumferential direction. The vertical rib st1 increases the strength of the axially extending portion 264. The vertical rib st1 suppresses deformation of the axially extending portion 264. With this configuration, on the radially inner surface of the intermediate portion 268 that defines the radially outer position of the facing surface portion 274, a location where the vertical rib st1 exists and a location where the vertical rib st1 does not exist are provided.

  The upper surface of the lower portion 270 has an inclined surface cs1 and a non-inclined surface cs2. The non-inclined surface cs2 is parallel to a plane perpendicular to the axial direction. The inclined surface cs1 is inclined with respect to a plane perpendicular to the axial direction. The inclined surface cs1 is adjacent to the circumferential first end T1. The inclined surface cs1 is inclined so as to become downward as it approaches the circumferential first end T1. The non-inclined surface cs2 is located between the inclined surface cs1 and the circumferential second end T2.

  In FIG. 8B, a double arrow C1 indicates a facing distance between the upper part 266 and the lower part 270. That is, the distance C1 is the facing distance of the facing surface portion 274. In the circumferential range where the inclined surface cs1 exists, the facing distance C1 changes. The closer to the circumferential first end T1, the greater the facing distance C1. In the circumferential range where the non-inclined surface cs2 exists, the facing distance C1 is constant.

  The facing surface portion 274 is provided between the first portion P1 in which the facing distance C1 is gradually increased as it approaches the first circumferential end T1, and between the first portion P1 and the circumferential second end T2 and protrudes and overlaps. And a second part P2 sandwiching the part TS1. In the second portion P2, the facing distance C1 is constant. In the second portion P2, the upper portion 266 and the lower portion 270 are in contact with the protruding overlapping portion TS1. Due to the presence of the inclined surface cs1, the lower portion 270 (inclined surface cs1) is not in contact with the protruding overlapping portion TS1 in the first portion P1.

  In the present embodiment, the upper surface of the opposing surface portion 274 (the lower surface of the upper portion 266) and the lower surface of the opposing surface portion 274 (the upper surface of the lower portion 270) are disposed at the same position in the circumferential direction. However, the circumferential position may be shifted between the upper surface of the opposing surface portion 274 (the lower surface of the upper portion 266) and the lower surface of the opposing surface portion 274 (the upper surface of the lower portion 270). For example, the center position in the circumferential direction of the upper surface of one lower portion 270 may be arranged at the center position in the circumferential direction of the lower surfaces of two upper portions 266 adjacent in the circumferential direction. In this case, the upper surface of the opposing surface portion 274 (the lower surface of the upper portion 266) and the lower surface of the opposing surface portion 274 (the upper surface of the lower portion 270) are alternately arranged in the circumferential direction. Even when the upper surface of the opposing surface portion 274 (the lower surface of the upper portion 266) and the lower surface of the opposing surface portion 274 (the upper surface of the lower portion 270) are misaligned, the lower surface of the upper portion 266 and the upper surface of the lower portion 270 are It is contained in the opposing surface part 274 facing in a direction. In addition, from the viewpoint of enhancing the fixability of sandwiching (described later) between the first projecting portion 284 and the second projecting portion 372 by the facing surface portion 274, the upper surface of the facing surface portion 274 (the lower surface of the upper portion 266) and the lower surface of the facing surface portion 274 ( The upper surface of the lower portion 270 is preferably arranged so as to overlap at least part of the circumferential direction, and most preferably, the center position in the circumferential direction of the upper surface of the opposing surface portion 274 (the lower surface of the upper portion 266); The center position in the circumferential direction of the lower surface of the opposing surface portion 274 (the upper surface of the lower portion 270) is preferably matched.

  FIG. 10A is a perspective view of the fixed valve body 280 as viewed from above, and FIG. 10B is a perspective view of the fixed valve body 280 as viewed from below. FIG. 11A is a plan view of the fixed valve body 280, and FIG. 11B is a bottom view of the fixed valve body 280. FIG. 12A is a side view of the fixed valve main body 280, and FIG. 12B is a cross-sectional view taken along the line AA in FIG. 11A.

  As described above, the fixed valve body 280 includes the hot water valve hole 300, the water valve hole 320, and the discharge valve hole 340. Further, as described above, fixed valve body 280 has smooth surface PL2. The smooth surface PL2 is the upper surface of the fixed valve body 280. The smooth surface PL2 is a flat surface. In addition, from the viewpoint of facilitating understanding, in FIG. 10A and FIG. 11A, lines existing on the slopes of the valve holes are appropriately deleted.

  Fixed valve body 280 has lower surface PL3. The lower surface PL3 is a plane. The lower surface PL3 is a plane along the direction perpendicular to the axis. The lower surface PL3 is parallel to the smooth surface PL2.

  As shown in FIG. 11A, the shape of the hot water valve hole 300 on the upper surface (smooth surface PL2) is curved and extends substantially along the circumferential direction. As shown in FIG. 11B, the shape of the hot water valve hole 300 on the lower surface PL3 is circular.

  As shown in FIG. 11A, the hot water valve hole 300 has an upward surface 302. The upward surface 302 is provided at one end in the longitudinal direction of the hot water valve hole 300 and the other end in the longitudinal direction of the hot water valve hole 300. The upward surface 302 has a slope inclined with respect to the smooth surface PL2.

  As shown in FIG. 11B, the hot water valve hole 300 has a downward surface 304. The downward surface 304 is provided at a radially inner portion of the hot water valve hole 300 and a radially outer portion of the hot water valve hole 300. The downward surface 304 has a slope inclined with respect to the smooth surface PL2.

  As shown in FIG. 11A, the shape of the water valve hole 320 on the upper surface (smooth surface PL2) is curved and extends substantially along the circumferential direction. As shown in FIG. 11B, the shape of the water valve hole 320 on the lower surface PL3 is circular.

  As shown in FIG. 11A, the water valve hole 320 has an upward surface 322. The upward surface 322 is provided at one end in the longitudinal direction of the water valve hole 320 and the other end in the longitudinal direction of the water valve hole 320. The upward surface 322 has a slope inclined with respect to the smooth surface PL2.

  As shown in FIG. 11B, the water valve hole 320 has a downward surface 324. The downward surface 324 is provided on the radially inner portion of the water valve hole 320 and on the radially outer portion of the water valve hole 320. The downward surface 324 has an inclined surface that is inclined with respect to the smooth surface PL2.

  As shown in FIGS. 11A and 12B, the discharge valve hole 340 has an upward surface 342. The upward surface 342 has a slope inclined with respect to the smooth surface PL2.

  As shown in FIGS. 11B and 12B, the discharge valve hole 340 has a downward surface 344. The downward surface 344 has an inclined surface that is inclined with respect to the lower surface PL3.

  An engaging portion 282 is provided on the lower surface of the fixed valve main body 280. The engaging portion 282 is a concave portion (hole). Two engaging portions 282 are provided.

  A protrusion 284 is provided on the side surface of the fixed valve main body 280. In order to distinguish from other protrusions, the protrusions 284 are also referred to as first protrusions. The first protrusion 284 protrudes radially outward. In the fixed valve body 280, the first protrusions 284 are provided at a plurality of locations in the circumferential direction. A plurality (three) of first protrusions 284 are provided. The 1st protrusion part 284 is arrange | positioned at equal intervals in the circumferential direction. The 1st protrusion part 284 is arrange | positioned equally in the circumferential direction.

  13A is a perspective view of the fixed valve lower member 360 as viewed from above, and FIG. 13B is a perspective view of the fixed valve lower member 360 as viewed from below. FIG. 14A is a plan view of the fixed valve lower member 360, and FIG. 14B is a bottom view of the fixed valve lower member 360. FIG. 15A is a side view of the fixed valve lower member 360, and FIG. 15B is a cross-sectional view taken along the line AA in FIG. 14B. 15A and 15B are diagrams in which the upper part of the fixed valve lower member 360 is the lower part of the drawing and the lower part of the fixed valve lower member 360 is the upper part of the drawing.

  As described above, the fixed valve lower member 360 includes the hot water passage hole 362, the water passage hole 364, and the water discharge passage hole 366. The hot water passage hole 362 is a circular hole. The water passage hole 364 is a circular hole. The water discharge passage hole 366 is a circular hole.

  On the upper surface of the fixed valve lower member 360, a seal groove m2 is provided around the hot water passage hole 362. The seal groove m2 is a groove extending along a circle. On the upper surface of the fixed valve lower member 360, a seal groove m <b> 2 is provided around the water passage hole 364. On the upper surface of the fixed valve lower member 360, a seal groove m <b> 2 is provided around the water discharge passage hole 366. The first seal member s2 described above is disposed in each of the seal grooves m2.

  As shown in FIG. 13B, on the lower surface of the fixed valve lower member 360, the side wall WL (WL1) of the hot water passage hole 362 protrudes downward. The side wall WL1 is a cylinder. This cylinder has a step surface k3. The aforementioned second seal member s3 is disposed on the step surface k3. Side wall WL1 (WL) has side surface SF2. The side surface SF2 is a circumferential surface. A second seal member s3 is disposed along the side surface SF2.

  As shown in FIG. 13B, on the lower surface of the fixed valve lower member 360, the side wall WL (WL2) of the water passage hole 364 protrudes downward. The side wall WL2 is a cylinder. This cylinder has a step surface k3. The aforementioned second seal member s3 is disposed on the step surface k3. Side wall WL2 (WL) has side surface SF2. The side surface SF2 is a circumferential surface. A second seal member s3 is disposed along the side surface SF2.

  As shown in FIG. 13B, on the lower surface of the fixed valve lower member 360, the side wall WL (WL3) of the water discharge passage hole 366 protrudes downward. The side wall WL3 is a cylinder. This cylinder has a step surface k3. The aforementioned second seal member s3 is disposed on the step surface k3. Side wall WL3 (WL) has side surface SF2. The side surface SF2 is a circumferential surface. A second seal member s3 is disposed along the side surface SF2.

  As shown in FIG. 13A, an engaging portion 368 is provided on the upper surface of the fixed valve lower member 360. The engaging part 368 is a convex part. A plurality (two) of engaging portions 368 are provided. The engaging portion 368 engages with the engaging portion 282 described above. This engagement is an uneven engagement.

  As shown in FIG. 13B, an engaging portion 370 is provided on the lower surface of the fixed valve lower member 360. A plurality (three) of engaging portions 370 are provided. These engaging portions 370 are equally arranged in the circumferential direction. The engaging part 370 is a convex part.

  A protrusion 372 is provided on the side surface of the fixed valve lower member 360. The projecting portion 372 projects outward in the radial direction. In order to distinguish from other protrusions, the protrusions 372 are also referred to as second protrusions. The 2nd protrusion part 372 is provided in the multiple places of the circumferential direction. A plurality (three) of second protrusions 372 are provided. The 2nd protrusion part 372 is arrange | positioned at equal intervals in the circumferential direction. The 2nd protrusion part 372 is arrange | positioned equally in the circumferential direction.

  FIG. 16A is a perspective view of the lower case 380 as viewed from above, and FIG. 16B is a perspective view of the lower case 380 as viewed from below. FIG. 17A is a plan view of the lower case 380, and FIG. 17B is a bottom view of the lower case 380. 18A is a side view of the lower case 380, FIG. 18B is a cross-sectional view taken along line AA in FIG. 18A, and FIG. 18C is FIG. 17A. It is sectional drawing along the AA of.

  As described above, the lower case 380 includes the hot water introduction hole 382, the water introduction hole 384, and the water discharge hole 386. The hot water introduction hole 382 is a circular hole. The water introduction hole 384 is a circular hole. The water discharge hole 386 is a circular hole.

  As shown in FIG. 16A, the periphery of the hot water introduction hole 382 is recessed on the upper surface of the lower case 380. Lower case 380 has a plane PL4 formed around hot water introduction hole 382 and a side surface SF1 extending from the radially outer side of plane PL4 to the upper side in the axial direction. The plane PL4 is annular. The side surface SF1 is a circumferential surface.

  As shown in FIG. 16A, the periphery of the water introduction hole 384 is recessed on the upper surface of the lower case 380. Lower case 380 has a plane PL4 formed around water introduction hole 384 and a side surface SF1 extending from the radially outer side of plane PL4 to the upper side in the axial direction.

  As shown in FIG. 16A, the periphery of the water discharge hole 386 is recessed on the upper surface of the lower case 380. Lower case 380 has a plane PL4 formed around water discharge hole 386, and a side surface SF1 extending from the radially outer side of plane PL4 to the upper side in the axial direction.

  The lower case 380 has an upper extension 392. The upper extension 392 protrudes upward from the upper surface of the lower case 380. A plurality of (three) upwardly extending portions 392 are provided. The upward extending portions 392 are equally arranged in the circumferential direction. The upper extending portions 392 are arranged at equal intervals in the circumferential direction. The above-described engaging convex portion 388 is provided in the upward extending portion 392. One engaging convex portion 388 is provided on one upper extending portion 392.

  The lower case 380 has an elastic body arrangement part 394. The elastic body placement portion 394 is provided on the upper surface of the lower case 380. The elastic body placement portion 394 is a recess (hole) extending downward. A plurality (three) of elastic body arrangement portions 394 are provided. The elastic body arrangement | positioning part 394 is arrange | positioned equally in the circumferential direction. The elastic body arrangement | positioning parts 394 are arrange | positioned at equal intervals in the circumferential direction. The elastic body 420 (spring) described above is disposed in these elastic body placement portions 394.

  As shown in FIG. 16A, the lower case 380 has an engaging portion 396. In order to distinguish from other engaging parts, the engaging part 396 is also referred to as a second engaging part. The second engaging portion 396 is a recess. The second engaging portion 396 is configured to engage with the fixed valve holding member 260. The second engaging portion 396 is configured to engage with the first engaging portion 272. This engagement is an uneven engagement.

  FIG. 19 is a perspective view of the fixed valve main body 280 and a portion below the fixed valve body 280 (hereinafter also referred to as a lower portion 440) in the valve assembly 100. FIG. 20 is a plan view of the lower portion 440. FIG. 21A is a side view of the lower portion 440, and FIG. 21B is a cross-sectional view taken along the line AA in FIG. 22A. FIG. 22 is a side view of the lower portion 440 viewed from another angle, and FIG. 22B is a cross-sectional view taken along the line AA in FIG.

  The lower portion 440 includes a fixed valve holding member 260, a fixed valve body 280, a first seal member s2, a fixed valve lower member 360, a second seal member s3, a lower case 380, an elastic body 420, a seal member s4, and a seal member s5. Including.

  As shown in FIG. 20, the axially extending portions 264 of the fixed valve holding member 260 and the upwardly extending portions 392 of the lower case 380 are alternately arranged in the circumferential direction. An axially extending portion 264 is disposed between adjacent upper extending portions 392. In other words, the upper extending portion 392 is disposed between the adjacent axial extending portions 264.

  As shown in FIGS. 22B and 21B, the fixed valve main body 280 and the fixed valve lower member 360 are held by the fixed valve holding member 260 (coupling mechanism). The fixed valve main body 280 and the fixed valve lower member 360 are sandwiched between the fixed valve holding members 260 (connection mechanisms). More specifically, the first protrusion 284 of the fixed valve main body 280 and the second protrusion 372 of the fixed valve lower member 360 are sandwiched between the fixed valve holding members 260. More specifically, the first protrusion 284 and the second protrusion 372 are sandwiched between the upper part 266 and the lower part 270 of the fixed valve holding member 260. That is, the first projecting portion 284 and the second projecting portion 372 are sandwiched between the facing surface portions 274.

  As shown in FIG. 21B, the engaging portion 370 of the fixed valve lower member 360 is engaged with the elastic body 420. An engaging portion (projection) 370 is disposed inside the elastic body 420 (coil spring). The engaging portion 370 prevents the displacement of the elastic body 420.

  FIG. 23 is a perspective view showing the lower surface of the fixed valve lower member 360. As shown in FIGS. 23 and 21B, the upper end of the elastic body 420 is in contact with the lower surface of the fixed valve lower member 360. The lower end of the elastic body 420 is in contact with the upper surface of the lower case 380 (the bottom surface of the recess 394 serving as an elastic body arrangement portion). The elastic body 420 biases the fixed valve lower member 360 upward.

  The material of the fixed valve lower member 360 is resin. When the material is ceramic, such as the fixed valve body 280, it is difficult to mold it into a complicated shape. However, the fixed valve lower member 360 can be formed into a complicated shape. By providing the fixed valve lower member 360, it is easy to provide the side wall WL protruding downward in the axial direction. It is also easy to provide the seal groove m2, the convex portion 368, the convex portion 370, and the like.

  FIG. 24 shows a process of attaching the fixed valve holding member 260.

  In this step, the fixed valve main body 280 and the fixed valve lower member 360 are overlapped to form an overlapping body 500 having a protruding overlapping portion TS1 (step 1; FIG. 24A). The protrusion overlapping part TS1 is formed by matching the circumferential position (phase) between the first protrusion 284 of the fixed valve main body 280 and the second protrusion 372 of the fixed valve lower member 360. The protruding overlapping part TS1 is constituted by a first protruding part 284 and a second protruding part 372. In the overlapping body 500, the protruding overlapping portion TS1 is formed at each of a plurality of locations (three locations) in the circumferential direction. That is, in the overlapping body 500, the protruding overlapping portions TS1 are arranged at a plurality of locations in the circumferential direction. The plurality of (three) protruding overlapping portions TS1 are arranged at equal intervals in the circumferential direction. In the fixed valve body 520 in the assembled state, the protruding overlapping portion TS1 is sandwiched between the facing surface portions 274.

  The overlapping body 500 is formed in the valve assembly 100. That is, the valve assembly 100 has this overlapping body 500. In the overlapping body 500, the fixed valve main body 280 and the fixed valve lower member 360 are overlapped in a state where the circumferential positions of the first protrusion 284 and the second protrusion 372 coincide with each other.

  Next, the overlapping member 500 is covered with the fixed valve holding member 260 (from above) (step 2; FIG. 24B). In step 2, the axially extending portion 264 of the fixed valve holding member 260 is disposed between the adjacent protruding overlapping portions TS1. At this stage, the protruding overlapping portions TS1 and the axially extending portions 264 are alternately arranged in the circumferential direction. The state shown in FIG. 24B is also referred to as a preparation state.

  Next, the fixed valve holding member 260 is rotated with respect to the overlapping body 500 (see the solid line arrow in FIG. 25B), and the circumferential position (phase) of the axially extending portion 264 is changed to the circumference of the protruding overlapping portion TS1. It is made to correspond to a direction position (phase) (step 3; (c) of FIG. 24). This step 3 is also referred to as a rotation fitting process. The fixed valve body 520 is formed by this rotation fitting process. This state is also referred to as an assembled state.

  As described above, the overlapping body 500 and the fixed valve holding member 260 are configured to be capable of mutual transition between the preparation state and the assembly state. As described above, a state in which the protruding overlapping portions TS1 and the axially extending portions 264 are alternately arranged in the circumferential direction is a preparation state. A state in which the circumferential positions of the protruding overlapping part TS1 and the axially extending part 264 coincide with each other is an assembled state. The assembled state is the assembled fixed valve body 520. As described above, the protruding overlap portion TS1 is sandwiched between the facing surface portions 274 in the assembled state. In the transition from the preparation state to the assembly state, the protruding overlap portion TS1 passes through the first portion P1 and is disposed in the second portion P2.

  In the fixed valve body 520, the first protrusion 284 and the second protrusion 372 are sandwiched between the upper part 266 and the lower part 270 (see FIG. 22B). In other words, in the fixed valve body 520, the protruding overlap portion TS1 is sandwiched between the upper portion 266 and the lower portion 270. Thus, in the fixed valve body 520, the fixed valve main body 280 and the fixed valve lower member 360 are coupled by the fixed valve holding member 260. Further, as described above, this coupling can be easily achieved by the rotation fitting process.

  In the rotation fitting step, the protruding overlapping portion TS1 is slid and inserted into the axially extending portion 264 (opposing surface portion 274) from the circumferential first end T1 (see FIG. 8B). The inclined surface cs1 described above contributes to smooth the slide insertion. When the protruding overlapping portion TS1 is further rotated with respect to the axially extending portion 264, the protruding overlapping portion TS1 hits the above-described vertical rib st1 (see FIGS. 8B and 9). By this contact, the completion of the rotation fitting process (completion of the fixed valve body 520) can be known. The valve assembly 100 has this (completed) fixed valve body 520.

  The fixed valve holding member 260 is an example of a connection mechanism that connects the fixed valve main body 280 and the fixed valve lower member 360. A member other than the fixed valve main body 280 and the fixed valve lower member 360, such as the fixed valve holding member 260, may be used for this connection mechanism. In addition, the separate member may not be used for the coupling mechanism. For example, this connection may be achieved by uneven engagement between the fixed valve main body 280 and the fixed valve lower member 360. As this uneven engagement, for example, the same configuration as the uneven engagement (described above) between the movable valve upper member 220 and the movable valve main body 240 can be adopted.

  The coupling mechanism such as the fixed valve holding member 260 maintains the integrity of the fixed valve main body 280 and the fixed valve lower member 360. Regardless of the force acting from the water pressure, the coupling mechanism such as the fixed valve holding member 260 maintains the sealing performance (compression degree) of the first seal member s2.

  The fixed valve lower member 360 may not be used, and the fixed valve body 520 may be formed only by the fixed valve main body 280. Of course, when the fixed valve lower member 360 is not used, a connecting mechanism such as the fixed valve holding member 260 is unnecessary.

  In the present embodiment, the fixed valve body 520 is fitted into the lower case 380. An axially extending portion 264 in the fixed valve body 520 is disposed between adjacent upper extending portions 392 in the lower case 380 (see FIGS. 19 and 20). Further, the first engaging portion 272 (convex portion) of the fixed valve holding member 260 engages with the second engaging portion 396 (concave portion) of the lower case 380 (see FIG. 22B). Of course, the first engaging portion 272 may be a concave portion, and the second engaging portion 396 may be a convex portion.

  Due to the engagement of the first engagement portion 272 and the second engagement portion 396, deformation of the fixed valve holding member 260 is suppressed. The lower end of the axially extending portion 264 is easily displaced because the annular coupling portion 262 is not present. The engagement between the first engagement portion 272 and the second engagement portion 396 suppresses this displacement.

  The outer surface of the axially extending portion 264 has a circumferential surface. The circumferential surface is a curved surface that protrudes radially outward. Similarly, the inner surface of the axially extending portion 264 has a circumferential surface. This circumferential surface is also a curved surface convex outward in the radial direction. Thus, the axially extending portion 264 has a curved portion that is bent so as to protrude outward in the radial direction. For this reason, the deformation such that the facing surface portion 274 opens is unlikely to occur. Therefore, the holding of the protruding overlap portion TS1 by the facing surface portion 274 is stably maintained. The deformation that opens the facing surface portion 274 is a deformation in which the facing distance C1 on the radially inner side of the facing surface portion 274 is larger than the facing distance C1 on the radially outer side of the facing surface portion 274.

  25 and 26 are plan views of the movable valve main body 240 and the fixed valve main body 280 that are overlapped with each other. These plan views are views seen from the upper side of the movable valve main body 240. 25 and 26, the flow path forming recess 242 of the movable valve main body 240 is indicated by a one-dot chain line. This flow path forming recess 242 should be indicated by a broken line, but is indicated by an alternate long and short dash line to facilitate distinction from the valve hole of the fixed valve body 280. On the other hand, each valve hole of the fixed valve body 280 is indicated by a broken line. That is, the hot water valve hole 300, the water valve hole 320, and the discharge valve hole 340 are indicated by broken lines.

  FIG. 25 shows an example of a valve hole water stop state. In FIG. 25, the flow path forming recess 242 does not overlap the hot water valve hole 300 and the water valve hole 320. That is, in FIG. 25, the hot water valve hole 300 and the water valve hole 320 are closed. Therefore, water does not come out.

  FIG. 26 shows an example of the valve hole circulation state. In FIG. 26, the flow path forming recess 242 overlaps the water valve hole 320. Therefore, water is discharged. In the state of FIG. 26, only water is discharged. Of course, as is apparent from the function of the hot and cold water mixing tap 10, the flow path forming recess 242 can overlap both the hot water valve hole 300 and the hot water valve hole 320, or only the hot water valve hole 300. You can also.

  FIG. 27 is an enlarged cross-sectional view of a part of FIG. There is a gap gp1 between the fixed valve holding member 260 and the fixed valve lower member 360 that allows water to enter. This gap gp1 is necessary to achieve sealing by the first seal member s2. Due to the gap gp1, water flows to the sealing position by the first seal member s2. A downward water pressure acts on the upward surface 374 in contact with the inflowing water. Further, an upward water pressure acts on the downward surface 286 in contact with the inflowing water. In FIG. 27, only the portion related to the water discharge passage hole 366 is shown, but the upward surface 374 and the downward surface 286 also exist in the portion related to the hot water passage hole 362 and the water passage hole 364.

  As shown in FIG. 27, a gap gp <b> 2 that allows water to enter is provided between the fixed valve lower member 360 and the lower case 380. Due to the gap gp2, water flows to the sealing position by the second seal member s3. An upward water pressure acts on a downward surface 376 (a pressure receiving surface U5 described later) in contact with the inflowing water. In FIG. 27, only the portion related to the water discharge passage hole 366 is shown, but the downward surface similar to the downward surface 376 also exists in the portion related to the hot water passage hole 362 and the water passage hole 364.

[Upward water pressure FU and downward water pressure FD]
Due to the water pressure, a force FU and a force FD act on the fixed valve main body 280 and the fixed valve lower member 360. Surfaces that come into contact with water are subjected to water pressure. That is, the surface in contact with water is a pressure receiving surface. The direction of the force is the direction perpendicular to the surface. That is, the direction of the force is determined by the direction of the pressure receiving surface. Of the force generated by the water pressure, the upward force in the axial direction (the upward component in the axial direction) is the force FU. This force FU is an upward force received by water pressure. The force FU is also referred to as an upward water pressure FU. Of the force generated by the water pressure, the downward force in the axial direction (the downward component in the axial direction) is the force FD. This force FD is a downward force received by water pressure. The force FD is also referred to as a downward water pressure FD.

  The force received by the fixed valve body 520 is the sum of the force received by the fixed valve body 280 and the force received by the fixed valve lower member 360.

[Force that the fixed valve body 520 receives from water pressure]
In the fixed valve body 520, the pressure receiving surfaces D that receive the downward force FD due to water pressure are D1, D2, D3, D4, and D5 below.
(1) Pressure receiving surface D1: Upward surface 302 of hot water valve hole 300 (solid hatched portion in FIGS. 25 and 26)
(2) Pressure receiving surface D2: Upward surface 322 of the water valve hole 320 (solid hatched portion in FIGS. 25 and 26)
(3) Pressure receiving surface D3: Upward surface 342 of discharge valve hole 340 (solid line hatched portion in FIG. 26)
(4) Pressure receiving surface D4: Upward surface 374 related to the gap gp1 (see FIG. 27)
(5) Pressure receiving surface D5: A portion of the smooth surface PL2 of the fixed valve body 280 that overlaps the flow path forming recess 242 (broken line hatched portion in FIG. 26).

The pressure receiving surface D4 is present around the hot water passage hole 362, around the water passage hole 364, and around the water discharge passage hole 366, respectively. That is, the pressure receiving surface D4 includes the following pressure receiving surface D4-1, pressure receiving surface D4-2, and pressure receiving surface D4-3.
(6) Pressure receiving surface D4-1: A portion related to the hot water passage hole 362 in the upward surface 374.
(7) Pressure receiving surface D4-2: A portion related to the water passage hole 364 in the upward surface 374.
(8) Pressure receiving surface D4-3: A portion related to the water discharge passage hole 366 in the upward surface 374.

In the fixed valve body 520, the pressure receiving surfaces U that receive the upward force FU due to water pressure are the following U1, U2, U3, U4, and U5.
(1) Pressure receiving surface U1: Downward surface 304 of the hot water valve hole 300 (see FIG. 11B)
(2) Pressure receiving surface U2: Downward surface 324 of the water valve hole 320 (see FIG. 11B)
(3) Pressure receiving surface U3: Downward surface 344 of the discharge valve hole 340 (see FIG. 11B)
(4) Pressure receiving surface U4: Downward surface 286 of the fixed valve body 280 related to the gap gp1 (see FIG. 27)
(5) Pressure receiving surface U5: Downward surface 376 of fixed valve lower member 360 related to gap gp2 (see FIG. 27)

The pressure receiving surface U4 exists around the hot water valve hole 300, around the water valve hole 320, and around the discharge valve hole 340, respectively. That is, the pressure receiving surface U4 includes the following pressure receiving surface U4-1, pressure receiving surface U4-2, and pressure receiving surface U4-3.
(6) Pressure receiving surface U4-1: A portion related to hot water valve hole 300 in downward surface 286.
(7) Pressure receiving surface U4-2: A portion related to the water valve hole 320 in the downward surface 286.
(8) Pressure receiving surface U4-3: A portion related to the discharge valve hole 340 in the downward surface 286.

Further, the pressure receiving surface U5 exists around the hot water passage hole 362, around the water passage hole 364, and around the water discharge passage hole 366, respectively. That is, the pressure receiving surface U5 includes the following pressure receiving surface U5-1, pressure receiving surface U5-2, and pressure receiving surface U5-3.
(9) Pressure receiving surface U5-1: A portion related to hot water passage hole 362 in downward surface 376.
(10) Pressure receiving surface U5-2: Of the downward surface 376, a portion related to the water passage hole 364.
(11) Pressure receiving surface U5-3: A portion related to the water discharge passage hole 366 in the downward surface 376.

  Here, the axial downward force acting on the pressure receiving surface D1 is FD1, the axial downward force acting on the pressure receiving surface D2 is FD2, and the axial downward force acting on the pressure receiving surface D3 is FD3. The axial downward force acting on the pressure receiving surface D4 is FD4, and the axial downward force acting on the pressure receiving surface D5 is FD5.

  Further, the axial upward force acting on the pressure receiving surface U1 is FU1, the axial upward force acting on the pressure receiving surface U2 is FU2, and the axial upward force acting on the pressure receiving surface U3 is FU3. The axially upward force acting on the pressure receiving surface U4 is FU4, and the axially upward force acting on the pressure receiving surface U5 is FU5.

The downward water pressure FD acting on the fixed valve body 520 is the sum of FD1 to FD5. The upward water pressure FU acting on the fixed valve body 520 is the sum of FU1 to FU5. Calculation formulas of the force FD and the force FU acting on the fixed valve body 520 are as follows.
FD = FD1 + FD2 + FD3 + FD4 + FD5
FU = FU1 + FU2 + FU3 + FU4 + FU5

  When the difference (FU−FD) is positive, the difference (FU−FD) acts as a force for pressing the fixed valve body 280 against the movable valve body 240. That is, when FU is larger than FD, the difference (FU−FD) acts as a force for pressing the fixed valve body 280 against the movable valve body 240.

  Each force is proportional to the planar projection area of each pressure receiving surface. The planar projection area means an area in plan view as shown in FIGS. For example, the planar projection area of the pressure receiving surface D1 is the area of the solid line hatched portion in FIGS. For example, the force FD1 can be calculated by multiplying the plane projection area of the pressure receiving surface D1 by the water pressure.

  The presence / absence of circulation between the valve holes changes due to the left / right rotation position and the front / rear rotation position of the lever 160. For this reason, water stop and water discharge are switched, and the water discharge temperature also changes. In addition, clogging may occur downstream of the valve bodies (the fixed valve body 520 and the movable valve body 250). This clogging also causes a water stoppage. That is, although water can flow through the valve body, a water stoppage state can occur due to clogging downstream of the valve body. In the present application, the downstream side of the valve body is also referred to as a secondary side.

  The following terms are used to distinguish the states described above. The state where the valve hole is not circulating is also referred to as a valve hole water stop state. Moreover, the state in which the flow between the valve holes is achieved is also referred to as a valve hole flow state. The water stoppage due to clogging downstream of the valve body is also referred to as a secondary water stoppage. Even in the valve hole circulation state, discharge may not be performed due to the secondary water stoppage state.

  The secondary water stoppage state is caused by clogging of the head 24, for example. Further, for example, when the water discharge specification can be switched in the head 24, the instantaneous non-circulation that occurs at the time of the switching also causes a secondary water stoppage state. Further, for example, in a faucet having a water purification cartridge or the like on the downstream side of the valve body, a secondary water stoppage state may occur due to clogging in the water purification cartridge. Such secondary water stoppage is usually difficult to occur, but can occur rarely or instantaneously. Therefore, as a product specification, it is necessary to cope with this secondary water stoppage state. Conventionally, the water pressure acting on the fixed valve body has been downward due to the balance of the pressure receiving area, so this downward force has been particularly excessive in the secondary water stoppage state. Conventionally, the initial pressing force by the packing has been increased in consideration of this excessive downward force.

  Considering the secondary water stop state, various states can occur in the faucet. Each of these states affects the pressure received by the pressure receiving surface.

In the valve hole water stop state, the following two states can occur.
[State 1A]: The valve hole is water-stopped and the secondary side is in circulation.
[State 1B]: The valve hole is water-stopped and the secondary side is clogged.

In the valve hole circulation state, the following six states can occur.
[State 2A]: The water valve hole 320 does not flow, the hot water valve hole 300 flows, and the secondary side flows.
[State 2B]: The water valve hole 320 does not flow, the hot water valve hole 300 flows, and the secondary side is clogged.
[State 3A]: The hot water valve hole 300 does not flow, the water valve hole 320 flows, and the secondary side flows.
[State 3B]: The hot water valve hole 300 does not flow, the water valve hole 320 flows, and the secondary side is clogged.
[State 4A]: A state in which the hot water valve hole 300 and the water valve hole 320 are in circulation and the secondary side is in circulation.
[State 4B]: A state in which the hot water valve hole 300 and the water valve hole 320 circulate and the secondary side is clogged.

  Table 1 below shows the relationship between each of these states and the water pressure received by each pressure receiving surface.

  As Table 1 shows, in the state where water is being discharged, the water pressure acting on each pressure receiving surface is relatively small. The water pressure in this case is displayed as “medium” in Table 1. On the other hand, when water is stopped, the water pressure acting on each pressure receiving surface is relatively large. The water pressure in this case is displayed as “large” in Table 1.

  In the valve hole water stop state (states 1A and 1B), water does not flow downstream from the flow path forming recess 242. Therefore, water pressure does not act downstream. However, when the state 4B is shifted to the state 1B, the water pressure acts on the downstream side even in the valve hole water stop state (see (Note) in Table 1). When the valve body is in circulation, water flows downstream from the flow path forming recess 242, so that water pressure acts on the downstream side. In the secondary water stop state, the water pressure is higher than in the state where the secondary side is circulating.

  The secondary water stop state includes a case where clogging downstream of the valve body is not complete. In particular, in the states 2B, 3B, and 4B, even if clogging is not complete, the water pressure acting on each pressure receiving surface is increased.

  In the state 2A, the water pressure is higher in the closed hot water valve hole 300 than in the circulating water valve hole 320. For this reason, a large water pressure acts on the pressure receiving surfaces related to the hot water valve hole 300 and the hot water passage hole 362. Further, in the state 3A, the water pressure is higher in the closed water valve hole 320 than in the hot water valve hole 300 in circulation. For this reason, a large water pressure acts on the pressure receiving surfaces related to the water valve hole 320 and the water passage hole 364.

  The position of the flow path forming recess 242 changes depending on the left and right pivot position and the front and rear pivot position of the lever 160. The mixing ratio of hot and cold water can be adjusted by changing the left-right rotation position of the lever 160. The discharge amount can be adjusted by changing the front-rear rotation position of the lever 160. The area of the pressure receiving surface D5 varies depending on the position of the flow path forming recess 242. That is, the FD 5 changes depending on the position of the flow path forming recess 242.

[Area of pressure receiving surface in fixed valve body 520 in valve hole water stop state (state 1A)]
In the state 1A, the area (plane projection area) of each pressure receiving surface in the fixed valve body 520 of the present embodiment is as follows.

(1) Area of pressure receiving surface D1: 19.6 mm ²
(2) Area of pressure receiving surface D2: 19.6 mm ²
(3) Area of pressure receiving surface D3: No water pressure (4) Area of pressure receiving surface D4: 130 mm ² (total area of D4-1 and D4-2)
(5) Area of pressure receiving surface D5: No water pressure (no portion receiving water pressure)
(6) Area of pressure receiving surface U1: 33.73 mm ²
(7) Area of pressure receiving surface U2: 33.73 mm ²
(8) Area of pressure receiving surface U3: No water pressure (no portion receiving water pressure)
(9) Area of pressure receiving surface U4: 130 mm ² (total area of U4-1 and U4-2)
(10) Area of pressure receiving surface U5: 172.6 mm ² (total area of U5-1 and U5-2)

Therefore, in the fixed valve body 520 in the valve hole water stop state, the area MD1 of the pressure receiving surface D that receives the downward force is the sum of the areas of the pressure receiving surface D1, the pressure receiving surface D2, and the pressure receiving surface D4, and is 169.2 mm ^2. It is. Further, in the fixed valve body 520 in the valve hole water stop state, the area MU1 of the pressure receiving surface U that receives the upward force is the sum of the areas of the pressure receiving surface U1, the pressure receiving surface U2, the pressure receiving surface U4, and the pressure receiving surface U5. 370.06 mm ² . The difference (MU1-MD1) is 200.86mm ^2. Area MU1 is larger than area MD1. In this state 1A, an upward force is applied to the fixed valve body 520 by water pressure.

  In the fixed valve body 520 in the state 1A, the difference (FU−FD) is calculated by multiplying the difference (MU1−MD1) by the water pressure. For example, when the water pressure is 2.0 MPa, the difference (FU−FD) is 200.86 × 2.0 = 401.72 (N).

  The water pressure acting on each pressure receiving surface in the state 1B is normally the same as in the state 1A. However, as described above, when the state 4B is shifted to the state 1B, the water pressure on the downstream side of the flow path forming recess 242 is maintained (see (Note) in Table 1).

[Area MD1 of Fixed Valve Body 520 in Valve Hole Still Water State]
The size of the fixed valve body is limited. In order to realize the water discharge specification required for the hot and cold water mixing tap, the upper surface opening and the lower surface opening in each valve hole of the fixed valve body need to be appropriately arranged. With this arrangement, an upward surface 302 and an upward surface 322 are preferably provided. Moreover, it is preferable to provide each upward surface (302 and 322) which has a slope from a viewpoint of suppressing a water hammer and achieving a smooth flow. From these viewpoints, the area MD1 in Ben'anatome water condition is preferably 50 mm ² or more, more preferably 100 mm ² or more, 140 mm ² or more is more preferable. From the viewpoint of securing contact pressure to suppress the area MD1, area MD1 in Ben'anatome water condition is preferably 450 mm ² or less, more preferably 300 mm ² or less, 200 mm ² or less still more preferred.

[Area MU1 in fixed valve body 520 in valve hole water stop state]
To increase the upward water pressure FU, from the viewpoint of enhancing the contact pressing force, the area MU1 in Ben'anatome water condition is preferably 150 mm ² or more, 200 mm ² or more, more preferably, 300 mm ² or more is more preferable. If the contact pressing force is excessive, the frictional force (sliding resistance) between the movable valve body and the fixed valve body increases, and the operability of the lever can be lowered. From this viewpoint, the area MU1 in Ben'anatome water condition is preferably 800 mm ² or less, more preferably 600 mm ² or less, 450 mm ² or less still more preferred.

[Difference in valve hole water stop condition (MU1-MD1)]
To increase the upward water pressure FU, from the viewpoint of enhancing the contact pressure, the difference in Ben'anatome water state (MU1-MD1) is preferably 50 mm ² or more, more preferably 100 mm ² or more, 150 mm ² or more is more preferable. If the contact pressing force is excessive, the sliding resistance increases, and the operability of the lever can be lowered. In this respect, the difference in Ben'anatome water state (MU1-MD1) is preferably 500 mm ² or less, more preferably 350 mm ² or less, more preferably 250 mm ² or less.

  As will be described later, the plane projection area of the fixed valve body 280 is Sk. If the value of (MU1-MD1) / Sk is too small, (MU1-MD1) becomes small, the upward water pressure FU becomes small, and the contact pressing force can be too small. Or when the value of (MU1-MD1) / Sk is too small, the area Sk becomes large and the water faucet becomes large or the cost tends to increase. From these viewpoints, (MU1-MD1) / Sk in the valve-hole water-stop state is preferably 0.05 or more, more preferably 0.1 or more, and more preferably 0.15 or more. If the value of (MU1-MD1) / Sk is too large, (MU1-MD1) becomes large, the contact pressing force becomes excessive, the sliding resistance increases, and the operability of the lever tends to be lowered. From this viewpoint, (MU1-MD1) / Sk in the valve-hole water-stop state is preferably 0.8 or less, more preferably 0.5 or less, and more preferably 0.3 or less. In this embodiment, (MU1-MD1) / Sk is 0.23 in the valve hole water stop state.

[Ratio in valve hole still water state (MU1 / MD1)]
From the viewpoint of increasing the upward water pressure FU and increasing the contact pressure, the ratio (MU1 / MD1) in the valve-hole water-stop state is preferably 1.2 or more, more preferably 1.5 or more, and 1.7 or more. Further preferred. If the contact pressing force is excessive, the sliding resistance increases, and the operability of the lever can be lowered. In this respect, the ratio (MU1 / MD1) in the valve-hole water-stop state is preferably 4.0 or less, more preferably 3.0 or less, and still more preferably 2.5 or less. In the present embodiment, the ratio (MU1 / MD1) in the valve hole water stop state is 2.19.

[Area of pressure receiving surface in fixed valve body 520 in valve hole distribution state (states 2A to 4B)]
In states 2A to 4B, the area (planar projection area) of each pressure receiving surface in the fixed valve body 520 of the present embodiment is as follows.

(1) Area of pressure receiving surface D1: 19.6 mm ²
(2) Area of pressure receiving surface D2: 19.6 mm ²
(3) Area of pressure receiving surface D3: 160.5 mm ²
(4) Area of pressure receiving surface D4: 195 mm ² (total area of D4-1, D4-2, and D4-3)
(5) Area of pressure receiving surface D5: 51.6 mm ² (in the case of FIG. 26)
(6) Area of pressure receiving surface U1: 33.73 mm ²
(7) Area of pressure receiving surface U2: 33.73 mm ²
(8) Area of pressure receiving surface U3: 21.16 mm ²
(9) Area of pressure receiving surface U4: 195 mm ² (total area of U4-1, U4-2 and U4-3)
(10) Area of pressure receiving surface U5: 258.9 mm ² (total area of U5-1, U5-2 and U5-3)

Therefore, in the fixed valve body 520 in the valve hole circulation state (state of FIG. 26), the area MD1 of the pressure receiving surface D that receives the downward force is the sum of the areas of D1, D2, D3, D4, and D5. .3 mm ² . In the fixed valve body 520 in the valve hole circulation state, the area MU1 of the pressure receiving surface U that receives the upward force is the sum of the areas of U1, U2, U3, U4, and U5, and is 542.52 mm ² . The difference (MU1-MD1) is 96.22mm ^2. Even in the valve hole circulation state, the area MU1 is larger than the area MD1. In this valve hole circulation state, an upward force is applied to the fixed valve body 520 by water pressure. In particular, in the secondary water stop state (states 2B, 3B, and 4B), since the water pressure is large, this upward force increases.

  In the fixed valve body 520 in the valve hole circulation state, the difference (FU−FD) is calculated by multiplying the difference (MU1−MD1) by the water pressure. For example, when the water pressure is 2.0 MPa, the difference (FU−FD) is 96.22 × 2.0 = 192.44 (N). As shown in Table 1, in the state 2A and the state 3A, the pressure is different between the pressure receiving surfaces. In such a case, the pressure is calculated by multiplying each pressure receiving surface by the water pressure acting on the pressure receiving surface.

As described above, even in the same valve hole circulation state, the area of the pressure receiving surface D5 can change. However, even when the area of the pressure receiving surface D5 is maximized, the area MU1 is larger than the area MD1. That is, regardless of the positional relationship between the fixed valve body 520 and the movable valve main body 240, the area MU1 is larger than the area MD1 in all valve hole circulation states (states 2A, 2B, 3A, 3B, 4A, and 4B). Even in the valve hole water stop state (states 1A and 1B), the area MU1 is larger than the area MD1. The area MU1 is larger than the area MD1 regardless of the left / right rotation position of the lever and the front / rear rotation position of the lever. In the present embodiment, the change in the area of the pressure receiving surface D5 in the valve hole circulation state has a minimum value of 28.76 mm ² and a maximum value of 51.6 mm ² .

  In the prior art, the area MU1 is smaller than the area MD1 in the valve hole circulation state. In this case, the difference (FU−FD) is negative. That is, a downward force is applied to the fixed valve body 520 by water pressure. In order to secure the pressing force (contact pressing force) between the movable valve body and the fixed valve body against this downward force, conventionally an upward external force (upward external force) applied to the fixed valve body is required. Met. Conventionally, this upward external force has been applied by packing that has been greatly compressed and deformed. This upward external force is applied even when there is no water pressure or when the water pressure is low. Therefore, linking has been easy to occur when the unused state is long. Further, the durability of the packing is lowered, and further, the water tightness is lowered due to permanent deformation of the packing. In addition, in the packing, stress relaxation and cold shrinkage occur, and thus the upward external force is likely to fluctuate. In anticipation of such fluctuations, when the upward upward force by the packing is increased and a larger initial pressing force is set, the frictional force between the fixed valve body 520 and the movable valve body 250 increases, and the operation load and the amount of wear increase. Life is reduced.

  In the present embodiment, a gap gp2 is provided, and a pressure receiving surface U5 is provided on the lower surface of the fixed valve lower member 360. By using the lower surface of the fixed valve lower member 360, a wide pressure receiving surface U is secured. For this reason, in this embodiment, the area MU1 is larger than the area MD1 in the valve hole circulation state (states 2A, 2B, 3A, 3B, 4A, and 4B). An upward force is applied to the fixed valve body 520 by the water pressure in the valve hole circulation state. Therefore, the upward external force due to the packing can be reduced. For this reason, linking is suppressed. Moreover, since the upward external force (initial pressing force) by this packing can be suppressed, the frictional force between the fixed valve body 520 and the movable valve body 250 can be reduced, and the operation load and the amount of wear can be reduced. . For this reason, the lifetime of the faucet can be extended. Further, it is not necessary to strongly compress the packing, and the durability of the packing is improved. In the valve assembly 100 described above, there is no upward force applied from the packing to the fixed valve body 520. In the valve assembly 100 described above, there is no upward force applied from the first seal member s2 to the fixed valve body 520. In the valve assembly 100 described above, there is no upward force applied from the second seal member s3 to the fixed valve body 520.

  By providing the pressure receiving surface U using the fixed valve lower member 360, the degree of freedom in designing the area MU1 is increased. Therefore, an appropriate upward force can be set.

  When the fixed valve lower member 360 is not used, a pressure receiving surface U corresponding to the pressure receiving surface U5 may be provided in the fixed valve main body 280. The pressure receiving surface U can be provided on the above-described lower surface PL3, for example. Further, the pressure receiving surface U can be increased by devising the shape of each valve hole of the fixed valve body 280. However, the size of the fixed valve body 280 is limited, and when the fixed valve body 280 is made of ceramic, it is difficult to manufacture a shape that can increase the pressure receiving surface U, and the pressure receiving surface U is increased. A special shape increases the manufacturing cost. Therefore, it is not easy to increase the pressure receiving surface U in each valve hole. From these viewpoints, it is preferable that the fixed valve lower member 360 is provided and the pressure receiving surface U is provided on the fixed valve lower member 360.

  In the valve hole circulation state, the downward water pressure FD increases, but the main cause is the pressure receiving surface D3. Among the pressure receiving surfaces related to the downward water pressure FD, the pressure receiving surface D3 of the discharge valve hole 340 is wide (see FIG. 26). This wide pressure receiving surface D3 receives water pressure only in the valve hole circulation state. In the valve hole circulation state, the downward water pressure FD acting on the fixed valve body 520 is likely to increase.

  Conventionally, in the valve hole circulation state, the area MD1 is larger than the area MU1. In other words, conventionally, in the fixed valve body 520, the downward water pressure FD is larger than the upward water pressure FU. That is, a downward force is applied to the fixed valve body 520 by water pressure. This downward force acts in a direction in which the fixed valve body 520 is separated from the movable valve body 250. When the contact pressing force between the movable valve body 250 and the fixed valve body 520 is insufficient, water leakage occurs. For this reason, conventionally, in order to prevent the contact pressing force from being insufficient, the packing is largely compressed and deformed to generate an upward external force. In contrast, in the present embodiment, an upward external force is applied using water pressure. In the present embodiment, an appropriate contact pressing force is applied in the valve hole circulation state, and at the same time, an excessive contact pressing force is suppressed in the valve hole water stop state.

[Area MD1 in Fixed Valve Body 520 in Valve Hole Flowing State]
The size of the fixed valve body is limited. In order to realize the water discharge specification required for the hot and cold water mixing tap, the upper surface opening and the lower surface opening in each valve hole of the fixed valve body need to be appropriately arranged. With this arrangement, an upward surface 302, an upward surface 322, and an upward surface 342 are preferably provided. Moreover, it is preferable to provide each upward surface (302, 322, and 342) which has a slope from a viewpoint of suppressing a water hammer and achieving a smooth flow. From these viewpoints, the area MD1 in the valve hole circulation state is preferably 150 mm ² or more, more preferably 300 mm ² or more, and still more preferably 400 mm ² or more. From the viewpoint of securing contact pressure to suppress the area MD1, area MD1 in the valve hole circulatory state it is preferably 800 mm ² or less, more preferably 650 mm ² or less, more preferably 500 mm ² or less. Note that the area MD1 in the valve hole circulation state varies depending on the left-right pivot position and the front-rear pivot position of the lever, but it is preferable that the maximum value of the area MD1 within the variation range satisfies the numerical limit. In this embodiment, since the area of the pressure receiving surface D5 changes, it is preferable that the area MD1 satisfies the above numerical limitation in a state where the area of the pressure receiving surface D5 is maximized.

[Area MU1 in Fixed Valve Body 520 in Valve Hole Flowing State]
To increase the upward water pressure FU, from the viewpoint of enhancing the contact pressing force, the area MU1 in the valve hole distribution state, 200 mm ² or more, more preferably 400 mm ² or more, 500 mm ² or more is more preferable. If the contact pressing force is excessive, the frictional force (sliding resistance) between the movable valve body and the fixed valve body increases, and the operability of the lever can be lowered. From this viewpoint, the area MU1 in the valve hole circulatory state is preferably 900 mm ² or less, more preferably 700 mm ² or less, more preferably 600 mm ² or less.

[Difference in valve hole circulation state (MU1-MD1)]
To increase the upward water pressure FU, from the viewpoint of enhancing the contact pressure, the difference in the valve hole circulatory state (MU1-MD1) is preferably 30 mm ² or more, more preferably 50 mm ² or more, 80 mm ² or more is more preferable. If the contact pressing force is excessive, the sliding resistance increases, and the operability of the lever can be lowered. From this viewpoint, the difference (MU1-MD1) in the valve hole circulation state is preferably 400 mm ² or less, more preferably 250 mm ² or less, and still more preferably 150 mm ² or less.

  As will be described later, the plane projection area of the fixed valve body 280 is Sk. If the value of (MU1-MD1) / Sk is too small, (MU1-MD1) becomes small, the upward water pressure FU becomes small, and the contact pressing force can be too small. Or when the value of (MU1-MD1) / Sk is too small, the area Sk becomes large and the water faucet becomes large or the cost tends to increase. From these viewpoints, (MU1-MD1) / Sk in the valve hole circulation state is preferably 0.02 or more, more preferably 0.05 or more, and more preferably 0.08 or more. If the value of (MU1-MD1) / Sk is too large, (MU1-MD1) becomes large, the contact pressing force becomes excessive, the sliding resistance increases, and the operability of the lever tends to be lowered. From this viewpoint, (MU1-MD1) / Sk in the valve hole circulation state is preferably 0.5 or less, more preferably 0.3 or less, and more preferably 0.2 or less. In this embodiment, (MU1-MD1) / Sk is 0.11 in the valve hole circulation state.

[Ratio in valve hole distribution state (MU1 / MD1)]
From the viewpoint of increasing the upward water pressure FU and increasing the contact pressure, the ratio (MU1 / MD1) in the valve hole circulation state is preferably 1.05 or more, more preferably 1.1 or more, and further preferably 1.2 or more. preferable. If the contact pressing force is excessive, the sliding resistance increases, and the operability of the lever can be lowered. In this respect, the ratio (MU1 / MD1) in the valve hole circulation state is preferably 2.0 or less, more preferably 1.7 or less, and still more preferably 1.5 or less. In the present embodiment, the ratio (MU1 / MD1) in the valve hole circulation state is 1.22.

[Force FA, Force FB received by fixed valve lower member 360]
As described above, when the force received by the fixed valve body 520 as a whole is taken into account, the force FD4 acting on the pressure receiving surface D4 and the force FU4 acting on the pressure receiving surface U4 cancel each other. This is because the force FD4 and the force FU4 are forces opposite to each other. Accordingly, when the size of FD4 and the size of FU4 are the same as in the present embodiment, both cancel each other.

  On the other hand, when considering the integrity of the fixed valve lower member 360 and the fixed valve main body 280, the force received by the fixed valve lower member 360 becomes a problem. This is because the force received by the fixed valve lower member 360 acts in a direction in which the fixed valve lower member 360 is separated from the fixed valve main body 280. In this case, even if the magnitude of the force FD4 and the magnitude of the force FU4 are the same, the force FD4 cannot be ignored.

  In the present application, the upward force received by the fixed valve lower member 360 is FA, and the downward force received by the fixed valve lower member 360 is FB.

  Of the pressure receiving surfaces D1 to D5 described above, the pressure receiving surface D of the fixed valve lower member 360 is the pressure receiving surface D4. Due to the pressure receiving surface D4, the fixed valve lower member 360 receives a downward force FB due to water pressure. Of the pressure receiving surfaces U1 to U5 described above, the pressure receiving surface U of the fixed valve lower member 360 is the pressure receiving surface U5. Due to the pressure receiving surface U5, the fixed valve lower member 360 receives an upward force FA due to water pressure. When considering the unity between the fixed valve lower member 360 and the fixed valve main body 280, the magnitude relationship between the force FA and the force FB becomes a problem.

[Area MD2 and MU2 of pressure receiving surface in fixed valve lower member 360 in valve hole water stop state]
The pressure receiving surfaces of the fixed valve lower member 360 are the pressure receiving surface D4 and the pressure receiving surface U5. The areas of the pressure receiving surface D and the pressure receiving surface U in the fixed valve lower member 360 in the valve hole water stop state are as follows.

(1) Area of pressure receiving surface D4: 130 mm ² (total area of D4-1 and D4-2)
(2) Area of pressure receiving surface U5: 172.6 mm ² (total area of U4-1 and U4-2)

In the fixed valve lower member 360 in the valve hole water stop state, the area MD2 of the pressure receiving surface D that receives the downward force is the area of the pressure receiving surface D4, and is 130 mm ² . In the fixed valve lower member 360 in the valve hole water stop state, the area MU2 of the pressure receiving surface U that receives the upward force is the area of the pressure receiving surface U5, and is 172.6 mm ² . The difference (MU2-MD2) is 42.6 mm ^2. In this valve hole water stop state, the area MU2 is larger than the area MD2. Therefore, in this valve hole water stop state, the upward force FA is larger than the downward force FB. The difference (FA−FB) is a positive value. In this valve hole water stop state, an upward force (FA-FB) acts on the fixed valve lower member 360 by water pressure.

[Area MD2 in valve hole water stop state]
When the fixed valve main body 280 and the fixed valve lower member 360 are provided, a seal member is disposed between them (see the first seal member s2 in the present embodiment). In this case, water flows into the sealing position by the seal member. As a result, the fixed valve lower member 360 has an upward surface that receives water pressure (see the upward surface 374 in FIG. 27). This upward surface receives downward water pressure FD. This downward water pressure FD acts in a direction in which the fixed valve lower member 360 is separated from the fixed valve main body 280. This downward water pressure FD can apply a load to the fixed valve holding member 260. Therefore, it is preferable that the downward water pressure FD acting on the fixed valve lower member 360 is suppressed.

From the viewpoint of preventing separation of the fixed valve lower member 360 and maintaining the integrity of the fixed valve body 520, the area MD2 of the pressure receiving surface D in the fixed valve lower member 360 is preferably small. From this viewpoint, the area MD2 in Ben'anatome water condition is preferably 300 mm ² or less, more preferably 200 mm ² or less, more preferably 150 mm ² or less. The area MD2 is preferably as small as possible. However, in consideration of the area MD2 that may be inevitably generated due to the seal structure, the area MD2 in the valve hole water stop state is 30 mm ² or more, more preferably 80 mm ² or more, and further 100 mm ² or more. It is easy to become.

[Area MU2 in valve hole water stop state]
From the viewpoint of making the area MU2 larger than the area MD2 and improving the integrity of the fixed valve body 520, the area MU2 of the pressure receiving surface U in the fixed valve lower member 360 is preferably large. Area MU2 in Ben'anatome water condition is preferably 50 mm ² or more, more preferably 100 mm ² or more, 140 mm ² or more is more preferable. In view of the size and arrangement of packing the stationary valve member, the area MU2 in Ben'anatome water condition is preferably 450 mm ² or less, more preferably 300 mm ² or less, 200 mm ² or less still more preferred.

[Difference in valve hole water stop condition (MU2-MD2)]
From the viewpoint of enhancing the integrity of the fixed valve body 520, the difference (MU2-MD2) in the valve hole water-stop state is preferably 10 mm ² or more, more preferably 25 mm ² or more, and even more preferably 35 mm ² or more. If the difference (MU2-MD2) is excessive, the seal member between the fixed valve main body 280 and the fixed valve lower member 360 may be excessively compressed. In this respect, the difference in Ben'anatome water state (MU2-MD2) is preferably 130 mm ² or less, more preferably 80 mm ² or less, more preferably 60 mm ² or less.

  As will be described later, the plane projection area of the fixed valve body 280 is Sk. If the value of (MU2-MD2) / Sk is too small, (MU2-MD2) becomes smaller and the integrity of the fixed valve body tends to be insufficient, the area Sk becomes larger, the faucet becomes larger, and the cost increases. Is easy to rise. From these viewpoints, (MU2-MD2) / Sk in the valve hole water-stop state is preferably 0.01 or more, more preferably 0.02 or more, and more preferably 0.04 or more. If the value of (MU2-MD2) / Sk is too large, (MU2-MD2) increases and the first seal member s2 between the fixed valve main body 280 and the fixed valve lower member 360 is excessively compressed, or the area Sk is too small and the amount of water discharged is likely to be insufficient. From these viewpoints, (MU2-MD2) / Sk in the valve-hole water-stop state is preferably 0.2 or less, more preferably 0.1 or less, and more preferably 0.07 or less. In the present embodiment, (MU2-MD2) / Sk is 0.05.

[Ratio in valve hole water stop state (MU2 / MD2)]
From the viewpoint of improving the integrity of the fixed valve body 520, the ratio (MU2 / MD2) in the valve hole water stop state is preferably 1.05 or more, more preferably 1.2 or more, and further preferably 1.25 or more. If the ratio (MU2 / MD2) is excessive, the seal member between the fixed valve main body 280 and the fixed valve lower member 360 may be excessively compressed. In this respect, the ratio (MU2 / MD2) in the valve-hole water-stop state is preferably 3.5 or less, more preferably 2.0 or less, and still more preferably 1.5 or less. In the present embodiment, the ratio (MU2 / MD2) in the valve hole water stop state is 1.33.

[Area MD2 and MU2 of pressure receiving surface of fixed valve lower member 360 in valve hole circulation state]
The areas of the pressure receiving surface D and the pressure receiving surface U in the fixed valve lower member 360 in the valve hole circulation state are as follows.

(1) Area of pressure receiving surface D4: 195 mm ² (total area of D4-1, D4-2, and D4-3)
(2) Area of pressure receiving surface U5: 258.9 mm ² (total area of U5-1, U5-2 and U5-3)

In the fixed valve lower member 360 in the valve hole circulation state, the area MD2 of the pressure receiving surface D that receives a downward force is the area of the pressure receiving surface D4 and is 195 mm ² . In addition, in the fixed valve lower member 360 in the valve hole circulation state, the area MU2 of the pressure receiving surface U that receives the upward force is the area of the pressure receiving surface U5, which is 258.9 mm ² . The difference (MU2-MD2) is 63.9 mm ² . Area MU2 is larger than area MD2. In this valve hole circulation state, the upward force FA is larger than the downward force FB. The difference (FA−FB) is a positive value. In this valve hole circulation state, an upward force (FA-FB) acts on the fixed valve lower member 360 by water pressure.

  Thus, the area MU2 is larger than the area MD2 regardless of the valve hole circulation state (states 2A, 2B, 3A, 3B, 4A and 4B) and the valve hole water stop state (states 1A and 1B). The area MU2 is larger than the area MD2 regardless of the left / right pivot position of the lever and the front / back pivot position of the lever. The force FA is greater than the force FB regardless of the lever's left-right rotation position and lever's front-rear rotation position. Regardless of the left / right pivot position of the lever and the forward / backward pivot position of the lever, the force due to the water pressure acts upward on the fixed valve lower member 360. That is, the force generated by the water pressure is a force that pushes the fixed valve lower member 360 toward the fixed valve body 280. Therefore, the integrity of the fixed valve lower member 360 and the fixed valve main body 280 is enhanced.

[Area MD2 in valve hole distribution state]
From the viewpoint of preventing separation of the fixed valve lower member 360 and maintaining the integrity of the fixed valve body 520, the area MD2 of the pressure receiving surface D in the fixed valve lower member 360 is preferably small. From this viewpoint, the area MD2 in the valve hole circulatory state is preferably 500 mm ² or less, more preferably 350 mm ² or less, more preferably 250 mm ² or less. The area MD2 is preferably as small as possible. However, in consideration of the area MD2 that may be inevitably generated due to the seal structure, the area MD2 in the valve hole circulation state is 50 mm ² or more, further 100 mm ² or more, and further 150 mm ² or more. Cheap.

[Area MU2 in valve hole distribution state]
From the viewpoint of making the area MU2 larger than the area MD2 and improving the integrity of the fixed valve body 520, the area MU2 of the pressure receiving surface U in the fixed valve lower member 360 is preferably large. Area MU2 in the valve hole circulatory state is preferably 100 mm ² or more, more preferably 150 mm ² or more, 200 mm ² or more is more preferable. Considering the arrangement of the size and packing of the stationary valve member, the area MU2 in the valve hole circulatory state is preferably 550 mm ² or less, more preferably 400 mm ² or less, 300 mm ² or less still more preferred.

[Difference in valve hole distribution state (MU2-MD2)]
From the viewpoint of improving the integrity of the fixed valve body 520, the difference (MU2-MD2) in the valve hole flow state is preferably 10 mm ² or more, more preferably 30 mm ² or more, and even more preferably 50 mm ² or more. If the difference (MU2-MD2) is excessive, the seal member between the fixed valve main body 280 and the fixed valve lower member 360 may be excessively compressed. In this respect, the difference in the valve hole circulatory state (MU2-MD2) is preferably 150 mm ² or less, more preferably 100 mm ² or less, more preferably 80 mm ² or less.

  As will be described later, the plane projection area of the fixed valve body 280 is Sk. If the value of (MU2-MD2) / Sk is too small, (MU2-MD2) becomes smaller and the integrity of the fixed valve body tends to be insufficient, the area Sk becomes larger, the faucet becomes larger, and the cost increases. Is easy to rise. From these viewpoints, (MU2-MD2) / Sk in the valve hole circulation state is preferably 0.01 or more, more preferably 0.03 or more, and more preferably 0.05 or more. If the value of (MU2-MD2) / Sk is too large, (MU2-MD2) increases and the first seal member s2 between the fixed valve main body 280 and the fixed valve lower member 360 is excessively compressed, or the area Sk is too small and the amount of water discharged is likely to be insufficient. From these viewpoints, (MU2-MD2) / Sk in the valve hole circulation state is preferably 0.25 or less, more preferably 0.15 or less, and even more preferably 0.10 or less. In this embodiment, (MU2-MD2) / Sk is 0.07.

[Ratio in valve hole distribution state (MU2 / MD2)]
From the viewpoint of enhancing the integrity of the fixed valve body 520, the ratio (MU2 / MD2) in the valve hole circulation state is preferably 1.05 or more, more preferably 1.2 or more, and further preferably 1.25 or more. If the ratio (MU2 / MD2) is excessive, the seal member between the fixed valve main body 280 and the fixed valve lower member 360 may be excessively compressed. In this respect, the ratio (MU2 / MD2) in the valve hole circulation state is preferably 3.5 or less, more preferably 2.0 or less, and still more preferably 1.5 or less. In the present embodiment, the ratio (MU2 / MD2) in the valve hole circulation state is 1.33.

The size of the fixed valve body 280 can be related to the areas MD1, MU1, MD2, and MU2 described above. In the plan view of FIG. 11B, the outer edge contour line Lk is determined. The area Sk of the figure drawn by the outer edge contour line Lk is defined as the planar projection area of the fixed valve body 280. From the viewpoint of realizing the water discharge specifications required for the hot and cold water mixing plug, the planar projection area of the fixed valve body 280 is preferably 400 mm ² or more, more preferably 600 mm ² or more, and still more preferably 800 mm ² or more. From the viewpoint of miniaturization of the valve assembly 100, the planar projected area of the fixed valve body 280 is preferably 1400 mm ² or less, more preferably 1200 mm ² or less, 1000 mm ² or less still more preferred. In the present embodiment, the planar projected area Sk of the fixed valve body 280 is 860.

  When a downward force acts on the fixed valve lower member 360 due to water pressure, this downward force becomes a force for pulling the fixed valve lower member 360 away from the fixed valve body 280. For this reason, a load is applied to the fixed valve holding member 260 (coupling mechanism), and sealing by the first seal member s2 is weakened. In the present embodiment, the force acting on the fixed valve lower member 360 by water pressure is upward. This upward force is a force that presses the fixed valve lower member 360 against the fixed valve body 280. Therefore, for example, even when the water pressure increases, the connection between the fixed valve main body 280 and the fixed valve lower member 360 is stably maintained. Further, the load on the fixed valve holding member 260 (coupling mechanism) is reduced.

[Auxiliary biasing member]
As described above, the elastic body 420 is provided below the fixed valve lower member 360 (fixed valve body 520) (see FIGS. 4 and 23). The elastic body 420 is disposed between the fixed valve body 520 and the lower case 380. The elastic body 420 is a spring (coil spring). The elastic body 420 is a compression spring. The axis of the elastic body 420 is parallel to the axial direction. The elastic body 420 is an example of an auxiliary biasing member.

  The urging force by the elastic body 420 acts in the axial direction. The elastic body 420 urges the fixed valve body 520 upward. The elastic body 420 urges the fixed valve body 520 upward regardless of the left / right rotation position of the lever and the front / rear rotation position of the lever. Regardless of the horizontal rotation position of the bar and the front-rear rotation position of the lever, the upward biasing force by the elastic body 420 is constant. This biasing force is relatively small.

  As described above, in the present embodiment, the contact pressure is ensured using the upward water pressure FU. When the water pressure is low and when there is no water pressure, the contact pressing force may be insufficient. The auxiliary biasing member 420 ensures an appropriate contact pressing force even when the water pressure is low and when there is no water pressure.

  The auxiliary biasing member 420 is not provided in the flow path (hot water and water). The auxiliary biasing member 420 is provided outside the flow path. The auxiliary biasing member 420 is not in contact with water. Therefore, the auxiliary biasing member 420 does not deteriorate due to contact with water.

  As described above, an upward external force can be generated by packing. However, in the case of packing, stress relaxation and cold temperature shrinkage occur, and the upward external force tends to fluctuate. By using the coil spring 420, a stable upward external force can be obtained.

  From the viewpoint of preventing water leakage between the movable valve body 250 and the fixed valve body 520 when the water pressure is low and when there is no water pressure, the auxiliary biasing member 420 applies the upward bias applied to the fixed valve body 520. The force FS is preferably 50 N or more, more preferably 100 N or more, and even more preferably 150 N or more. From the viewpoint of suppressing linking, the upward biasing force FS applied to the fixed valve body 520 by the auxiliary biasing member 420 is preferably 400 N or less, more preferably 300 N or less, and even more preferably 200 N or less. When there are a plurality of elastic bodies 420 as in this embodiment, the urging force FS is the sum of the urging forces of all the elastic bodies 420. In the present embodiment, the upward biasing force FS applied to the fixed valve body 520 by the auxiliary biasing member 420 is 170N.

  As described above, when the fixed valve lower member 360 is not used, a surface corresponding to the pressure receiving surface U5 can be provided on the fixed valve main body 280. In this case, the sealing performance between the fixed valve main body 280 and the member on the lower side thereof tends to be insufficient, but the elastic body 420 can improve the sealing performance.

[Seal member]
As shown in FIG. 27, the first seal member s <b> 2 is provided between the fixed valve main body 280 and the fixed valve lower member 360. More specifically, the first seal member s2 is provided between the lower surface PL3 of the fixed valve body 280 and the upper surface of the fixed valve lower member 360 (the bottom surface of the seal groove m2). The first seal member s2 is compressed in the axial direction. By this compression, the sealing performance of the first seal member s2 is exhibited. The pinching by the fixed valve holding member 260 maintains the compression of the first seal member s2. The dimensional relationship resulting from the facing distance C1 of the facing surface portion 274 maintains the sealing performance of the first seal member s2. Thus, due to the fixed valve holding member 260 (connection mechanism), the first seal member s2 is compressed in the axial direction.

  As described above, the fixed valve holding member 260 receives an upward force due to water pressure. However, the sealing performance (compression degree) of the first seal member s2 may be insufficient with only the force generated by the water pressure. In this embodiment, since the fixed valve holding member 260 is provided, the sealing performance is maintained regardless of the upward external force. That is, the sealing performance by the first seal member s2 is stably maintained without depending on the upward external force due to packing or the like.

  In order to prevent linking, it is preferable to reduce the contact pressing force, but in that case, the sealing performance (compression degree) of the first seal member s2 may be lowered. In other words, if the upward external force on the fixed valve lower member 360 is increased in order to maintain the sealing performance of the first seal member s2, the contact pressing force in the absence of water pressure also increases, and linking is likely to occur. In the present embodiment, by using the fixed valve holding member 260, the sealability (compression degree) of the first seal member s2 and the contact pressing force can be set individually. Therefore, the contact pressing force can be appropriately set while ensuring the sealing performance of the first seal member s2.

  The first seal member s2 is in contact with the lower surface PL3, which is a ceramic polishing surface. For this reason, even when a slight shift occurs in the circumferential position (phase) between the fixed valve main body 280 and the fixed valve lower member 360, the sealing performance is maintained.

  As shown in FIG. 27, the second seal member s3 is provided between the fixed valve lower member 360 and the lower case 380.

  As described above, the lower case 380 has the side surface SF1. The side surface SF1 extends along the axial direction. The side surface SF1 is a circumferential surface. Further, as described above, the fixed valve lower member 360 has the side surface SF2. The side surface SF2 extends along the axial direction. The side surface SF2 is a circumferential surface. The second seal member s3 is sandwiched between the side surface SF1 and the side surface SF2. The second seal member s3 is compressed in the direction perpendicular to the axis. The second seal member s3 is compressed in the radial direction of the second seal member s3. Thus, the lower case 380 has the side surface SF1 extending upward, the fixed valve lower member 360 has the side surface SF2 extending downward, and the second seal member s3 is sandwiched between the side surface SF1 and the side surface SF2. Compressed in the direction perpendicular to the axis.

  The sealability (compression degree) of the second seal member s3 is not affected by the force resulting from water pressure or the like. The sealing performance of the second seal member s3 is not affected by the downward water pressure FD and the upward water pressure FU. The sealing performance of the second seal member s3 is determined by the gap distance between the side surface SF1 and the side surface SF2. Therefore, the sealing performance between the fixed valve lower member 360 and the lower case 380 is high and there is little variation in the sealing performance. A stable sealing property is secured between the fixed valve lower member 360 and the lower case 380.

  In addition, as a material of sealing members, such as 1st sealing member s2 and 2nd sealing member s3, a fluorine-type rubber is preferable. Examples of the fluorine-based rubber include vinylidene fluoride (FKM), tetrafluoroethylene-propylene (FEPM), tetrafluoroethylene-purple chlorovinyl ether (FFKM), and the like.

In the present embodiment, the following configuration is evenly distributed to a plurality of locations (three locations) in the circumferential direction. These equal distributions contribute to stable fixation between the members.
(Configuration a) Axial extending portion 264 of fixed valve holding member 260
(Configuration b) Projection overlap portion TS1 of the overlap body 500
(Configuration c) Upper extension portion 392 of lower case 380
(Configuration d) Upper extension portion 392 of lower case 380
(Configuration e) Engaging portion (engaging convex portion) 388 of the upward extending portion 392
(Configuration f) Engaging portion (engaging hole) 122 of the upper case 120
(Configuration g) Engaging recess 390 of lower case 380
(Configuration h) Engaging convex portion 128 of upper case 120

  Due to the configuration a and the configuration b, the overlapping body 500 (the fixed valve main body 280 and the fixed valve lower member 360) is securely fixed by the fixed valve holding member 260. In addition, as described above, the fixed valve holding member 260 is attached to the overlapping body 500 by relative rotation with the overlapping body 500, and thus is not easily detached. Further, since the upper extending portions 392 and the axial extending portions 264 are alternately arranged in the circumferential direction, the rotation of the fixed valve holding member 260 and the fixed valve body 520 is prevented by the lower case 380. That is, the fixed valve body 520 is securely fixed by the lower case 380. In a state where the fixed valve body 520 is fixed to the lower case 380, the fixed valve holding member 260 cannot rotate with respect to the overlapping body 500, so that the fixed valve holding member 260 does not come off the overlapping body 500.

  Since the configuration e and the configuration f are engaged with each other, the upper case 120 is fixed to the lower case 380 with good balance. Furthermore, the upper case 120 is fixed to the lower case 380 in a well-balanced manner by the configuration g and the configuration h engaging with each other.

  Examples of the material of the fixed valve lower member 360 include resin and metal. Resin is preferable from the viewpoint of moldability into a complicated shape. This resin includes a fiber reinforced resin. Examples of preferable resins include PA resins, ABS resins, POM resins, PPS resins, PC resins, and fiber reinforcing materials thereof. PA resin is a polyamide resin. ABS resin is acrylonitrile butadiene styrene copolymer resin. POM resin is polyacetal resin. PPS resin is polyphenylene sulfide resin. PC resin is polycarbonate resin.

  Examples of the material of the fixed valve holding member 260 include resin and metal. Resin is preferable from the viewpoint of moldability into a complicated shape. This resin includes a fiber reinforced resin. Examples of preferable resins include PA resins, ABS resins, POM resins, PPS resins, PC resins, and fiber reinforcing materials thereof.

  In the comparison between the configuration disclosed in Japanese Utility Model Laid-Open No. 6-85974 and the above embodiment, the operational effects of the above embodiment based on this comparison are listed as an example as follows.

  In the configuration disclosed in Japanese Utility Model Publication No. 6-85974, an upward force due to water pressure acts on the seal ring 10 and is transmitted from the seal ring 10 to the fixed valve plate 7. For this reason, the transmission force to the fixed valve plate is likely to change due to the deterioration of the seal ring 10 or the change over time. Further, since the seal ring 10 is excessively crushed by receiving pressure due to water pressure in addition to the pressure received at the time of initial crushing, there is a high possibility that the deterioration is promoted. In the above embodiment, the fixed valve body 520 in which the fixed valve main body 280 and the fixed valve lower member 360 are integrated is subjected to water pressure, so that the transmission force to the fixed valve main body 280 is unlikely to fluctuate.

  In the configuration disclosed in Japanese Utility Model Publication No. 6-85974, the spring 11 is provided in the flow path. For this reason, the spring 11 is easily deteriorated by water or a substance such as chlorine contained in the water. In the above embodiment, such a problem does not occur because the spring 420 is provided outside the flow path.

  In the configuration disclosed in Japanese Utility Model Publication No. 6-85974, sealing is performed on the outer peripheral surface of the seal ring 10. The sealing pressure of this sealing is due to an increase in the outer diameter of the seal ring 10 due to the sealing pressure based on the dimension setting, the sealing pressure due to the radially outward force applied from the water pressure, and the axial pressing force of the spring 11. Due to the sealing pressure. However, there is a concern that the sealing performance is insufficient only with these sealing pressures. This is especially a concern when the water pressure is low. In the above embodiment, since the seal pressure of the second seal member s3 is determined by the dimension between the members (the gap distance between the side surface SF1 and the side surface SF2), there is no such concern.

  In the configuration disclosed in Japanese Utility Model Laid-Open No. 6-85974, the seal ring 10 is urged by the upper end of the spring 11. Due to the contact position between the spring 11 and the seal ring 10, the dimensional error of these members, the deterioration of these members, etc., the seal ring 10 pressed by the spring 11 is deformed abnormally, and the outer periphery of the seal ring 10 is There is a concern that the surface and the inner peripheral surface of the main body block 3 may be separated. In the above embodiment, since the spring is not in contact with the seal member, there is no such concern.

  In the configuration disclosed in Japanese Utility Model Laid-Open No. 6-85974, the seal ring 10 is urged by the upper end of the spring 11. At the contact position between the spring 11 and the seal ring 10, the spring 11 bites into the seal ring 10. The amount of biting of the spring 11 changes due to deterioration of the seal ring 10 and a change with time, and as a result, there is a risk that variations and changes in the axial sealing force of the seal ring 10 may occur. In the above embodiment, since the spring 420 is not in contact with the seal member, there is no such concern.

  In the configuration disclosed in Japanese Utility Model Laid-Open No. 6-85974, the seal ring 10 is urged by the upper end of the spring 11. At the contact position between the spring 11 and the seal ring 10, the spring 11 is worn and damaged. For this reason, there is a concern that the biasing force of the spring 11 is reduced and the contact pressing force is reduced. In the above embodiment, since the spring 420 is not in contact with the seal member, there is no such concern.

  In the configuration disclosed in Japanese Utility Model Publication No. 6-85974, the seal ring 10 is long in the axial direction. Due to the change in the water temperature, the amount of thermal expansion of the seal ring 10 changes, and this change tends to fluctuate the sealing force. Further, in the initial stage of use, the seal ring 10 expands due to the change over time of the seal ring 10, and in the later stage of use, the seal ring 10 contracts due to the change over time of the seal ring 10. In the seal ring 10 that is long in the axial direction, these expansion and contraction are likely to change the sealing force. In the second seal member s3 of the above embodiment, such a change in the axial seal force is unlikely to occur.

  The present application also describes other inventions that are not included in the claimed invention (including independent claims). Respective forms, members, configurations, and combinations thereof described in the claims and embodiments of the present application are recognized as inventions based on the respective functions and effects.

  Each form, member, configuration, etc. shown in each of the above embodiments is not limited to all of the forms, members, or configurations of these embodiments. It can be applied to all described inventions.

  The present invention can be applied to a hot and cold water mixing tap for any application.

DESCRIPTION OF SYMBOLS 10 ... Hot water mixing tap 12 ... Mixing stopper main body 14 ... Handle 16 ... Discharge part 18 ... Hot water introduction pipe 20 ... Water introduction pipe 22 ... Discharge pipe 100 ... Valve Assembly 120 ... Upper case 160 ... Lever 220 ... Movable valve upper member 240 ... Movable valve body 250 ... Movable valve body 260 ... Fixed valve holding member 280 ... Fixed valve body 360 ... Fixed valve lower member 380 ... Lower case 420 ... Elastic body (coil spring)
s1... seal member s2... seal member (first seal member)
s3: Seal member (second seal member)
PL1 ... Lower surface of the movable valve body (smooth surface, polished surface)
PL2 ... Upper surface of the fixed valve body (smooth surface, polished surface)
PL3: Bottom surface of fixed valve body (smooth surface, polished surface)
D1 to D5: Pressure receiving surface that receives downward water pressure (the entire fixed valve body)
U1-U5 ... Pressure receiving surface that receives upward water pressure (whole fixed valve body)
D4: Pressure receiving surface that receives downward water pressure (fixed valve lower member)
U5: Pressure receiving surface that receives upward water pressure (fixed valve lower member)

Claims (6)

A fixed valve body;
A movable valve body that can slide on the fixed valve body;
A lower case provided on the lower side of the fixed valve body;
A lever capable of rotating left and right and rotating back and forth and operating the movable valve element;
Have
The mixing ratio of hot water and water can be adjusted by changing the left and right pivot position of the lever.
The amount of discharge can be adjusted by changing the front / rear rotation position of the lever.
The fixed valve body is
A fixed valve body that contacts the movable valve body;
A fixed valve lower member located on the lower side of the fixed valve body;
A hot and cold water mixing tap having a fixed valve holding member that connects the fixed valve body and the fixed valve lower member.   The hot and cold water mixing tap according to claim 1, wherein a first seal member is provided between the fixed valve body and the fixed valve lower member. The fixed valve holding member has axially extending portions provided at a plurality of locations in the circumferential direction, and an annular connecting portion that connects these axially extending portions,
The axially extending portion has a facing surface portion facing in the vertical direction at a predetermined facing distance;
The hot / cold water mixing tap according to claim 1 or 2, wherein the fixed valve main body and the fixed valve lower member are sandwiched between the opposed surface portions. The fixed valve body has a first protrusion provided at a plurality of locations in the circumferential direction and protruding radially outward;
The fixed valve lower member has a second protrusion that is provided at a plurality of locations in the circumferential direction and protrudes radially outward,
An overlapping body is formed in which the fixed valve body and the fixed valve lower member are overlapped in a state where the circumferential positions of the first protrusion and the second protrusion coincide with each other,
The overlapping body has protruding overlapping portions that are constituted by the first protruding portion and the second protruding portion and are arranged at a plurality of locations in the circumferential direction,
The opposed surface portion includes a first end in the circumferential direction, a second end in the circumferential direction, a first portion in which the facing distance is gradually increased toward the first end in the circumferential direction, and the first portion and the circumference. A second portion provided between the second end of the direction and sandwiching the protruding overlapped portion,
The overlapping body and the fixed valve holding member are circumferentially arranged in a preparation state in which the protruding overlapping portions and the axially extending portions are alternately arranged in the circumferential direction, and the protruding overlapping portions and the axially extending portion. It is configured to allow mutual transition with the assembled state with the same directional position,
The hot and cold water mixing tap according to claim 3, wherein the protruding overlapping portion is arranged to pass through the first portion and be arranged in the second portion in the transition from the preparation state to the assembly state. The axially extending portion extends downward,
A first engaging portion is provided at the lower end of the axially extending portion,
The hot and cold water mixing plug according to any one of claims 1 to 4, wherein the lower case has a second engagement portion that engages with the first engagement portion. When the upward force that the fixed valve lower member receives by water pressure is FA, and the downward force that the fixed valve lower member receives by water pressure is FB,
The hot and cold water mixing plug according to any one of claims 1 to 5, wherein the force FA is greater than the force FB regardless of the left-right rotation position and the front-rear rotation position of the lever.

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