JP2008138824A - Hot-and-cold-water mixing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-and-cold-water mixing valve enabling an assured switching between cutout and flow and an assured change and adjustment of a mixing ratio by a simple structure. <P>SOLUTION: A cold water inlet hole 23 and a hot water inlet hole 24 are opened in the inner surface 213 of one end wall 211 of a housing 2 symmetrically with respect to an axis X. Oppositely to these inlet holes, a disk valve element 4 is disposed in a mixing chamber 3 to be rotatably driven around the axis X. A projecting flat surface 421 fully closing one of the cold water inlet hole and the hot water inlet hole and a recessed flat surface 422 fully opening the other opening are formed on and in the front surface of the valve element. Also, a sloped surface continuously tilts from the projecting flat surface to the recessed flat surface while uniformly tilting to both sides in the circumferential direction is formed in the front surface of the valve element. The supply pressure of a hot water is introduced, as a back pressure, into piston members 74a, 74b through back pressure introduction holes 73a, 73b to cancel the supply pressure. A pressing force from the piston members is transmitted to the valve element through ball members 83, 83, ... to eliminate friction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water / water mixing valve used for mixing hot water and water at a predetermined mixing ratio.

  Conventionally, as this kind of hot and cold water mixing valve, a pair of butterfly type valve bodies that undulate and swing each other, and a pair of valve bodies that undulate and swing to contact and separate the valve seat at the inlet and outlet of hot water and water It is known that the inflow of hot water and water can be individually closed and blocked or opened and circulated (see, for example, Patent Document 1).

  In addition, the inlets of hot water and water can be closed with valve bodies using spheres, and the pair of valve bodies can be closed by pressing them toward the inlet using cam members, or they can be opened by relaxing the pressure. The thing which did it is also known (for example, refer patent document 2).

JP-A-6-94145 Japanese Patent Laid-Open No. 2001-4051

  The hot and cold water mixing valve compared with the present invention is shown in FIG. This hot water / water mixing valve includes a hot water introducing chamber 202 communicating with a hot water inlet 201 into which hot water flows into a housing 200, a water introducing chamber 204 communicating with a water inlet 203 through which water flows, and the hot water introducing chamber 202 and water. A mixing chamber 205 is defined at an intermediate position sandwiched between the introduction chambers 204, and an outlet 206 through which hot water after mixing is led out communicates with the mixing chamber 205. On the other hand, in the housing 200, a shaft 208 having a cylindrical valve body 207 fixed on the tip side is disposed through the hot water introducing chamber 202, the mixing chamber 205, and the water introducing chamber 204 in this order. The valve body 207 is disposed so as to be capable of reciprocating in the axial direction of the shaft 208 in a state where the valve body 207 is disposed in the mixing chamber 205. A screw portion 209 and a serration portion 210 are formed on the base end side of the shaft 208, and the rotational driving force of the motor 600 is transmitted to the shaft 208 via the serration portion 210, so that the shaft 208 is rotated around the axis. Thus, the shaft 208 can be reciprocated in the axial direction via the screw portion 209. By this reciprocation, the valve body 207 moves in the axial direction of the shaft 208 to block the flow between the hot water introduction chamber 202 and the mixing chamber 205 (see the state shown by the solid line in FIG. 6), or conversely, the water introduction The flow between the chamber 204 and the mixing chamber 205 is blocked, or the flow of both is allowed to allow mixing of hot water and water, and the axial position of the valve body 207 is adjusted. The opening degree for circulating between the hot water introduction chamber 202 and the mixing chamber 205 and the opening degree for circulating between the water introduction chamber 204 and the mixing chamber 205 can be changed and adjusted with each other. It is possible to change and adjust the mixing ratio.

  However, in the case of such a hot and cold water mixing valve, the outer diameters of the valve portions 207a and 207b at both ends of the valve body 207 and the valve on which the valve portion is seated are used in order to reliably perform the hot water and water mixing function. Since strict dimensional accuracy and assembly position accuracy are required between the inner diameter and the seat inner diameter, for example, one of the roundness is out of order, or the coaxiality of the valve body 207 with respect to the shaft 208 axis is shifted. Then, the valve body 207 may be bitten or leaked. When such a phenomenon of biting or leakage occurs, the mixing ratio of hot water and water is also shifted from the control target to an unintended value, and an accurate mixing ratio cannot be realized.

  In addition, such a phenomenon is likely to occur even when the valve body is operated using a cam member as proposed in the above-mentioned patent document.

  The present invention has been made in view of such circumstances, and the object of the present invention is to ensure reliable shutoff, reliable switching between shutoff / distribution, and reliable change of the mixing ratio, while having a simple structure. An object of the present invention is to provide a hot and cold water mixing valve capable of realizing the adjustment.

  In order to achieve the above object, in the present invention, a mixing chamber defined in the housing, a water inlet hole and a hot water inlet hole opened on the inner surface of the housing wall constituting the mixing chamber, the water inlet hole and It is assumed that a disc-like valve body is provided that is large enough to cover the hot water inlet hole and is driven to rotate about the central axis. And the said water inlet hole and the hot water inlet hole are arrange | positioned so that it may open in a symmetrical position on both sides of the said center axis | shaft. In addition, as the valve body, one opening of the water inlet hole and the hot water inlet hole is closed in a fully closed state in close contact with the inner surface of the housing wall on the front surface facing the water inlet hole and the hot water inlet hole. A convex plane and a concave plane that is separated from the inner surface of the housing wall in the direction of the central axis and communicates with the mixing chamber with the other opening in a fully open state are formed symmetrically with respect to the central axis, and the convex plane In this case, slopes that are uniformly inclined to the concave plane are formed on both sides in the circumferential direction (claim 1).

  In the case of the present invention, for example, when the water inlet hole is closed in a fully closed state on the convex plane and the hot water inlet hole is fully opened on the concave plane, the mixing ratio is 0% for water and 100% for hot water. When the valve body is rotated around the central axis from this state, the water inlet hole opens and the slopes face each other from the convex plane that covered it, and water begins to flow into the mixing chamber. As the distance increases, the distance between the slope and the opening increases, so the amount of water inflow increases. On the contrary, since the slope faces the opening of the hot water inlet hole from the concave plane and the distance between the slope and the hot water inlet hole becomes gradually smaller, the amount of hot water inflow is reduced. As described above, the ratio of water and hot water flowing into the mixing chamber is changed by changing the rotational position of the valve body, and the mixing ratio of hot water and water in the mixing chamber is also changed. At that time, since the slope is uniform, the amount of change in the mixing ratio of hot water and water with respect to the amount of rotation is constant, and hot water and water can be mixed with an accurate mixing ratio simply by adjusting the amount of rotation. become. Then, such a reliable change and adjustment of the mixing ratio can be realized with a simple structure in which a disc-shaped valve body in which a convex plane, a concave plane and a pair of slopes are formed on the front surface is adopted.

  In the hot and cold water mixing valve according to the present invention, the convex plane and the concave plane can be formed in fan-shaped regions that are point-symmetric about the central axis, respectively. By doing in this way, it becomes possible to easily perform conversion adjustment of the rotational position of the valve body to realize a desired mixing ratio.

  The hot water / water mixing valve of the present invention further includes a back pressure means for applying a back pressure so as to at least cancel the hot water / water supply pressure acting on the valve body from the water inlet hole and the hot water inlet hole. can do. And as said back pressure means, two or more piston members arrange | positioned so as to oppose the axial direction of the said central axis with respect to the rear surface of the said valve body, and hot water and water from the said water inlet hole and a hot water inlet hole And a back pressure introduction hole for introducing the supply pressure as a back pressure to the piston member. (Claim 3). By doing so, the rotational position of the valve body can be easily converted with a light driving force by canceling the hot water / water supply pressure from the water inlet hole or hot water inlet hole acting on the front surface of the valve body. Thus, it is possible to improve the accuracy of adjusting the rotational position of the valve body, and hence improve the accuracy of the mixing ratio.

  Further, the hot water / water mixing valve provided with the back pressure means can further include a friction cutting means for reducing and reducing a frictional force generated when the valve body is rotationally driven. In this case, the friction cutting means may include at least three ball members that transmit back pressure from the piston member side to the valve body side in a point contact state. ). By doing so, the friction that becomes the rotational resistance of the valve body can be reduced and suppressed as much as possible, and the rotational position of the valve body can be converted with a lighter driving force. It is possible to improve accuracy and further improve the accuracy of the mixing ratio.

  As described above, according to the hot and cold water mixing valve according to any one of claims 1 to 4, a convex plane, a concave plane, and both on the front surface of the valve body facing the water inlet hole and the hot water inlet hole. Since the slope with a uniform slope connecting them is formed, the amount of change in the mixing ratio of hot water and water relative to the amount of rotation around the central axis of the valve body can be made constant, and only the amount of rotation of the valve body is adjusted This makes it possible to mix hot water and water at an accurate mixing ratio. Then, such a reliable change and adjustment of the mixing ratio can be realized with a simple structure in which the disc-like valve body having the front shape as described above is employed.

  In particular, according to the second aspect of the present invention, the conversion adjustment of the rotational position of the valve body for realizing a desired mixing ratio is achieved by forming the convex plane and the concave plane in respective fan-shaped regions that are symmetric with respect to the central axis. Can be easily performed.

  According to the third aspect of the present invention, by providing the back pressure means, the rotational position of the valve body can be converted by canceling the supply pressure of hot water / water from the water inlet hole or the hot water inlet hole acting on the front surface of the valve body. This can be easily performed with a light driving force, so that the accuracy of adjusting the rotational position of the valve element can be improved, and hence the accuracy of the mixing ratio can be improved. Furthermore, according to the fourth aspect of the present invention, the hot water / water mixing valve provided with the back pressure means is further provided with a friction cutting means, so that the friction that becomes the rotational resistance of the valve element is reduced and suppressed by a lighter driving force. The rotational position of the body can be converted, and the accuracy of adjusting the rotational position of the valve body can be further improved, and the accuracy of the mixing ratio can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory cross-sectional view of a hot and cold water mixing valve according to an embodiment of the present invention. In the figure, reference numeral 2 is a housing, 3 is a mixing chamber defined in the housing 2, 4 is a disc-shaped valve body, 5 is extended along the axis X which is a central axis, and the tip part is the valve body 4 described above. Is connected to and fixed to the shaft X and is rotatably held around the axis X, 6 is a motor as rotational drive means for changing the rotational position of the valve body 4 via the shaft 5, and 7 is applied to the valve body 4. A back pressure means 8 further applies a pressing biasing force to the valve body 4 after canceling the water pressure, and 8 is a friction cutting means for reducing and reducing the frictional force generated when the rotational position of the valve body 4 is changed.

  The housing 2 includes a cylindrical housing portion 21 having one end side (upper side in FIG. 1) opened and the other end side (lower side in the figure) closed in order to define the mixing chamber 3 therein. It is formed by assembling a block portion 22 that fits inside the opening of the cylindrical housing portion 21 and closes the opening. The other end wall (housing wall) 211 of the cylindrical housing portion 21 is formed with a water inlet hole 23 into which water flows and a hot water inlet hole 24 into which hot water flows so as to communicate with the mixing chamber 3. Has been. A water connection portion 231 is provided in the water inlet hole 23 so as to communicate with the water inlet hole 23, and a downstream end of a water supply pipe (not shown) is connected to the water connection portion 231. The hot water inlet hole 24 is also provided with a hot water connection portion 241 that communicates with the hot water inlet hole 24, and the downstream end of the hot water supply pipe (not shown) is connected to the hot water connection portion 241. Yes. The water supply pipe and the hot water supply pipe are supplied with hot water or water based on the back pressure, and when the hot water inlet hole 24 or the water inlet hole 23 is opened by the rotational position conversion of the valve body 4 described later, the mixing chamber. 3 to flow into. The above back pressure is the supply pressure of the water pipe. Water from the water pipe is supplied to the water supply pipe, and the water supplied from the water pipe is supplied to the hot water supply pipe after being subjected to heat exchange heating. There are cases. Accordingly, the same supply pressure acts from the water inlet hole 23 and the hot water inlet hole 24. Further, the peripheral wall 212 of the cylindrical housing portion 21 is opened to the hole wall of the water inlet hole 23 and extends to the one end side of the housing 2, and a first cylinder hole portion 71 a (described later) in the block portion 22. A back pressure introduction hole 73a communicating with the back pressure chamber 72a of FIG. 2 is also formed, and similarly, a hole is opened in the hole wall of the hot water inlet hole 24 and the peripheral wall 212 extends to one end side of the housing 2, A back pressure introducing hole 73b communicating with a back pressure chamber 72b of a second cylinder hole 71b described later in the portion 22 is formed.

  The inner surface 213 of the other end wall 211 of the cylindrical housing portion 21 is a flat surface with particularly high flatness, and the water inlet hole 23 and the hot water inlet having an inner diameter of D (mm) with respect to the inner surface 213, respectively. The hole 24 is opened at each position on the circumference centered on the axis X and symmetrical about the axis X. Further, the peripheral wall 212 of the cylindrical housing portion 21 is formed with an outlet hole 25 through which the mixed hot and cold water is led out of the housing 2.

  The mixing chamber 3 is partitioned between the inner surface of the other end wall 211 of the cylindrical housing portion 21 and the inner peripheral surface of the peripheral wall 212 and the block portion 22. In the inner surface 213, the water inlet hole 23 and the hot water inlet hole 24 communicate with the valve body 4 so that they can be selectively opened and closed, and the outlet hole 25 is always in communication with the peripheral wall 212.

  As shown in FIG. 3, the valve body 4 is formed into a flat columnar shape or disk shape having a predetermined height, and is a flat rear surface (upper surface in FIG. 1, lower surface in FIG. 3) 41; The front surface (the lower surface in FIG. 1 and the upper surface in FIG. 3) 42 which has four types of surface shapes and faces the inner surface 213 of the other end wall 211 of the cylindrical housing 21 and a deformed hole (for example, D in plan view) And a center hole 43 formed in the shape of a letter-shaped hole). Continuing on the front surface 42 is a flat convex surface 421 that is convex in the axis X direction, a flat concave surface 422 that is concave in the axis X direction, and a concave plane 422 on both sides in the circumferential direction from the convex plane 421. A pair of slopes 423 and 423 are formed. The convex plane 421, the concave plane, and the pair of inclined surfaces 423, 423 are formed for each fan-shaped region equally divided by 90 degrees in the circumferential direction as shown in FIG. The flat surface 422 is disposed on the side opposite to the center hole 43. Each inclined surface 423 is inclined with a uniform gradient with respect to the circumferential direction of the arrow K on the surface with the mesh pattern in FIG. 4A, and the axis X is the center between the convex plane 421 and the concave plane 422. If they are developed on a circumferential line of any diameter, they are smoothly connected so as to form a straight uniform inclined line.

  The valve body 4 has a diameter that covers all of the water inlet hole 23 and the hot water inlet hole 24 with the axis X as the center. By changing the rotational position about the axis X, the convex plane 421 becomes the water surface. When facing the entire surface of one of the inlet hole 23 and the hot water inlet hole 24, the concave plane 422 is formed to face the entire surface of the other opening. As shown in FIG. 1 and FIG. 4B, when the convex plane 421 covers the hot water inlet hole 24 and is fully closed, the concave plane 422 is opposed to the water inlet hole 23 and the opening thereof is fully opened. As a result, the inflow of hot water from the hot water inlet hole 24 to the mixing chamber 3 is completely blocked, while the inflow of water from the water inlet hole 23 is allowed. In the mixing chamber 3 in this state, the mixing ratio is 0% for hot water and 100% for water. Theoretically, the higher the flatness between the convex plane 421 and the inner surface 213, the better the adhesion, and 0% due to complete adhesion. At this time, the convex plane is set so that the communication opening area between the concave plane 422 and the inner surface 213 defining the mixing chamber 3 is equal to the opening area of the water inlet hole 23 or the hot water inlet hole 24 having the inner diameter D. A step amount H in the direction of the axis X between 421 and the concave plane 422 is set. That is, when the concave plane 422 is opposed to the water inlet hole 23, the water supplied to the water inlet hole 23 flows into the mixing chamber 3 at the current supply flow rate, while the concave plane 422 enters the hot water inlet hole 24. When facing each other, the hot water supplied to the hot water inlet hole 24 flows into the mixing chamber 3 with the supply flow rate until then.

  Further, the valve body 4 is rotated about the axis X, and the respective center positions of the inclined surfaces 423 and 423 are opposed to the water inlet hole 23 or the hot water inlet hole 24 in the rotational direction (FIG. 5A, ( b), the flow rate of water flowing into the mixing chamber 3 from the water inlet hole 23 is the same as a result of the same communication opening area between the water inlet hole 23 and the hot water inlet hole 24 and the mixing chamber 3. And the inflow rate of hot water from the hot water inlet hole 24 become equal to each other, and in the mixing chamber 3, water and hot water are mixed at a mixing ratio of 50% and led out from the outlet 25. And while the valve body 4 changes its rotational position from the state of FIG. 4 (a) to the state of FIG. 5 (a), each inclined surface 423 is formed with a uniform inclination as described above. 24, the hot water inflow rate linearly increases from 0% to 50% as the slope 423 overlaps the hot water inlet hole 24 from the state where the hot water inflow rate into the mixing chamber 3 is 0%. In the hole 23, the water inflow ratio linearly decreases from 100% to 50% as the slope 423 overlaps the water inlet hole 23 from the state where the water inflow ratio into the mixing chamber 3 is 100%. Become. Furthermore, when the valve body 4 is rotated 90 degrees in the direction of the arrow shown in FIG. 5 (a), the mixing ratio is reversed and the inflow ratio of hot water is increased from 50% to 100%. The inflow ratio of water will decrease from 50% to 0%. In short, the mixing ratio in the mixing chamber 3 is linearly changed in proportion to the rotation amount of the rotational position conversion of the valve body 4.

  The shaft 5 has a serration portion 51 formed on the proximal end side, a deformed cross-section portion (D-shaped cross-section portion) 52 corresponding to the center hole 43 of the valve body 4 formed on the distal end side, and an intermediate portion at the block portion 22. Is held so as to be able to rotate at a fixed position. Then, the rotational driving force around the axis X is transmitted from the motor 6 through the serration portion 51, and the valve body 4 is rotated together with the shaft 5 by the deformed cross-section portion 52 fitted in the center hole 43. It is like that. For example, the E-ring 53 is engaged with a circumferential groove formed in the shaft 5, and the E-ring 53 is connected to the block portion 22 and the first pressing plate 81. It is sandwiched between them so that it can rotate at a fixed position. At that time, a synthetic resin washer 54 is interposed on the block 22 side of the E-ring 53 in order to suppress and reduce the friction acting on the shaft 5 as it rotates.

  The back pressure means 7 includes a piston member 74a, 74b housed in each of the first cylinder hole portion 71a and the second cylinder hole portion 71b, and the piston member 74a, 74b as a valve element 4 with respect to the axis X direction. Springs 75a and 75b for pressing and urging on the side and the back pressure introduction holes 73a and 73b, and the pair of piston members 74a and 74b press the first push plate 81 toward the valve body 4 side. It has become. The friction cutting means 8 includes the first push plate 81, the second push plate 82 opposed to the first push plate 81 at the position on the valve body 4, the first push plate 81 and the second push plate. .. Are provided between the plates 82 so as to be freely rotatable (rollable) 83 (for example, ball bearings). The two piston members 74a and 74b act on the first pressing plate 81 to apply a pressing force to the front side (the lower side in FIG. 1) in the axis X direction, and the pressing members are in point contact with each other. Are transmitted to the second push plate 82 through 83, 83,..., And the valve body 4 is moved forward from the rear face 41 with which the second push plate 82 is in contact with the valve body 4, that is, the other end. It is transmitted as an acting force that presses the inner surface 213 of the wall 211. With this pressing force, the valve body 4 is in close contact with the inner surface 213 but is slid with respect to the inner surface 213 so that the rotational position can be changed.

  The diameter d of each of the piston members 74a and 74b is set to be the same as the inner diameter D of the water inlet hole 23 or the hot water inlet hole 24, and the back pressure chamber 72a is passed through the back pressure introduction holes 73a and 73b. , 72b, the supply pressure of water and hot water from the water inlet hole 23 and the hot water inlet hole 24 acts as a back pressure on the piston members 74a, 74b. Therefore, the supply pressure received by the valve body 4 is canceled by canceling out the back pressure. Therefore, the springs 75a and 75b may be omitted as the back pressure means 7, but preferably the springs 75a and 75b are added to set the back pressure slightly higher than the supply pressure. By applying an elastic biasing force, the close contact state between the opposing surfaces of the convex flat surface 421 and the inner surface 213 may be reliably maintained.

  Further, the ball members 83, 83,... Need only be interposed between the first push plate 81 and the second push plate 82, but either one (the second push plate 82 in the example shown in the figure). On the other hand, it is preferable to provide a holding concave portion or an arc-shaped concave groove so as to be held in the concave portion or the like so as to be able to roll or slide. The friction cutting means 8 is mainly intended to cut the friction between the piston members 74a and 74b and the valve body 4 side by joining them in a point contact state. The members 83, 83,... Do not have to be rotatable, but the function of friction cutting can be further enhanced by making the ball members 83, 83,. By suppressing or reducing the generation of frictional force by the friction cutting means 8, the rotational driving force for converting the rotational position of the valve body 4 can be greatly reduced, and the burden on the motor 6 can be reduced. . In addition to this, the combination of the back pressure means 7 and the friction cutting means 8 enables the rotational position of the valve body 4 to be converted with an extremely light rotational driving force, which not only reduces the burden on the motor 6. The rotational position of the valve body 4 can be adjusted easily and accurately.

  According to the above hot and cold water mixing valve, it has a simple structure in which only the disc-shaped valve body 4 in which four surfaces (convex plane 421, slopes 423, 423, concave plane 422) having a predetermined shape are formed on the front surface 42 is used. It is possible to reliably switch between full opening and closing of the hot water inlet hole 24 and the water inlet hole 23 and to make a reliable change adjustment to an arbitrary opening degree, thereby making a reliable change adjustment to an arbitrary mixing ratio of hot water and water. Will be able to do. That is, the flatness of the convex plane 421 and the inner surface 213 of the other end wall 211 is required to be precisely processed from the viewpoint of close closing function, but the convex plane 421 is centered on the axis X and the water inlet hole 23 or hot water As long as it has a width that can cover the inlet hole 24 (the diameter of the valve body 4), accurate dimensional accuracy is not required so much, and reliable hot water mixing can be ensured. Therefore, manufacture and assembly can be easily performed. . Further, the inflow ratio (inflow flow rate) between the water from the water inlet hole 23 and the hot water from the hot water inlet hole 24 in accordance with the rotation amount of the valve body 4 about the axis X (rotation angle, operation step of the motor 6). Can be linearly increased / decreased, and the operation control for realizing the target mixing ratio becomes easier and more accurate. That is, the amount of change in the inflow ratio (inflow rate) for a certain amount of rotational operation of the motor 6 can be made constant. Furthermore, as described above, by combining the back pressure means 7 and the friction cutting means 8, the rotational position of the valve body 4 can be smoothly converted with a light rotational driving force, and the durability of the motor 6 can be improved. In addition to improving the accuracy of the operation control, it is possible to improve the accuracy of the change adjustment of the rotational position of the valve body 4 and, consequently, to facilitate the change adjustment of the mixing ratio and improve the accuracy.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, the four surfaces of the convex plane 421, the slopes 423 and 423, and the concave plane 422 are each formed in a sector area of approximately 90 degrees in the circumferential direction. And the concave plane 422 90 degrees so that the convex plane 421 and the concave plane 422 are point-symmetric with respect to the axis X if the area that can be covered with the water inlet hole 23 or the hot water inlet hole 24 can be secured. It may be formed in a fan-shaped area having a smaller angle or a fan-shaped area having an angle larger than 90 degrees, and the slopes 423 and 423 may be formed with a uniform inclination in the range therebetween.

  In the above-described embodiment, the two piston members 74a and 74b are used. However, the present invention is not limited to this. For example, three, four, or five or more piston members may be provided in the circumferential direction. Good. In this case, the total pressing area of all the piston members may be made equal to the total opening area of the water inlet hole 23 and the hot water inlet hole 24.

  Further, the valve body 4 and the shaft 5 are integrally formed, the rotational driving force from the motor 6 is transmitted through the speed reduction mechanism, a driving source other than the motor 6 is used as the rotational driving means, The two push plates 82 may be omitted, and the ball members 83, 83,... May be held on the rear surface 41 of the valve body 4.

  In the above embodiment, hot water and water mixing valves for mixing two types of hot water and water at a predetermined flow rate ratio have been described. However, the present invention is not limited to two types of hot water and water, but two types having different properties and characteristics. It is also possible to use these fluids at a predetermined flow rate ratio.

  The back pressure means 7 or the back pressure means 7 and the friction cutting means 8 are not combined with the valve body 4 of the above embodiment, but are combined with other valve bodies from the water inlet hole and the hot water inlet hole. You may make it use for the use which cancels the supply pressure of hot water and water, makes it an equilibrium state, or reduces the friction at the time of the switching conversion operation of said other valve body.

It is a section explanatory view showing an embodiment of the present invention. It is an expanded sectional explanatory view in the AA line of FIG. It is an expansion perspective view which shows a valve body in the state which reversed the top and bottom with the state of FIG. 4A is an explanatory plan view of the valve body in the state shown in FIG. 3, and FIG. 4B is an explanatory sectional view taken along line BB in FIG. 4A. FIG. 5A is a plan view of the valve body rotated 90 degrees counterclockwise from the state of FIG. 4A, and FIG. 5B is a CC line of FIG. 5A. FIG. It is a section explanatory view of the hot and cold water mixing valve compared with the present invention.

Explanation of symbols

2 Housing 3 Mixing chamber 4 Valve body 6 Motor (Rotation drive means)
7 Back pressure means 8 Friction cutting means 23 Water inlet hole 24 Hot water inlet hole 25 Outlet 42 Front face 73a, 73b Back pressure introduction holes 74a, 74b Piston member 211 Other end wall (housing wall)
213 Inner surface 421 Convex plane 422 Concave plane 423 Slope X axis (central axis)

Claims (4)

A mixing chamber defined in the housing, a water inlet hole and a hot water inlet hole opening on the inner surface of the housing wall constituting the mixing chamber, and a size that can cover these water inlet hole and hot water inlet hole and around the central axis And a disc-shaped valve body that is driven to rotate,
The water inlet hole and the hot water inlet hole are arranged so as to open at symmetrical positions across the central axis,
The valve body has a convex plane that closes one opening of the water inlet hole and the hot water inlet hole in a fully closed state, in close contact with the inner surface of the housing wall, on the front surface facing the water inlet hole and the hot water inlet hole. A concave plane that is spaced apart from the inner surface of the housing wall in the central axis direction and communicates with the mixing chamber with the other opening in a fully open state, and is formed symmetrically across the central axis, and both sides in the circumferential direction from the convex plane Slopes that are uniformly inclined and continue to the concave plane are formed respectively.
A hot and cold water mixing valve. The hot and cold water mixing valve according to claim 1,
The hot and cold water mixing valve, wherein the convex plane and the concave plane are each formed in a fan-shaped region that is point-symmetric about the central axis. The hot and cold water mixing valve according to claim 1 or 2,
Back pressure means for applying a back pressure so as to at least cancel the supply pressure of hot water / water acting on the valve body from the water inlet hole and the hot water inlet hole,
The back pressure means includes two or more piston members disposed so as to face each other in the axial direction of the central axis with respect to the rear surface of the valve body, and supply of hot water / water from the water inlet hole and the hot water inlet hole. A hot water / water mixing valve comprising a back pressure introduction hole for introducing pressure as back pressure to the piston member. The hot and cold water mixing valve according to claim 3,
Friction cutting means further reducing frictional force generated when the valve body is rotationally driven,
The friction cutting means is a hot and cold water mixing valve comprising at least three ball members that transmit back pressure from the piston member side to the valve body side in a point contact state.

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