JP2008202701A - Hot-and-cold-water mixing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-and-cold-water mixing valve capable of moving a valve element smoothly and capable of stably conducting a temperature adjusting action by the movement of the valve element. <P>SOLUTION: The hot-and-cold water mixing valve 10 changes a flow-in ratio of hot and cold water by moving the valve element 20 provided with a cold water side valve part 22 and a hot water side valve part 24 in one of axial directions. At a part from a holding groove 102 to a shaft end at an opposite side of a cold water side valve seat 58 in an outer circumference surface of the cold water side valve part 22, protruding rods 108 protruding radially outward are provided at a plurality of positions in a circumferential direction and the protruding rods 108 are provided as sliding guides for a valve case 12 and axial recessed positions 110 from the holding groove 112 to the shaft end are formed in parts between the protruding rods 108. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot / cold water mixing valve, and more particularly to a hot / cold water mixing valve having an automatic temperature control function provided with a temperature sensing element in a mixing chamber.

2. Description of the Related Art Conventionally, a hot water / water mixing valve having an automatic temperature control function (thermostat type) having a temperature sensing element in a mixing chamber is widely used.
The hot water mixing valve with automatic temperature control function is as follows: (a) water inlet and hot water inlet provided in the valve case in the axial direction, and (b) water inlet and hot water inlet. And a cylindrical water-side valve portion each provided with a sealing member elastically contacting the inner peripheral surface of the valve case in an annular holding groove extending in the circumferential direction of the outer peripheral surface. A valve body provided with a hot water side valve portion and provided so as to be movable in the axial direction within the valve case, and (c) provided in the valve case, the water side valve portion and the hot water side valve portion being brought into contact with each other in the axial direction. Water side valve seat, hot water side valve seat, (d) mixing chamber for mixing water and hot water from the water inlet and hot water inlet, and (e) axial direction in response to the mixed water temperature in the mixing chamber A temperature sensing body that automatically adjusts the position of the valve body, and (f) a bias spring that biases the valve body in a direction to contract the temperature sensing body. The opening of the water inlet is reduced by one movement of the valve body in the axial direction, the opening of the hot water inlet is greatly changed, and the opening of the hot water inlet is reduced by the movement of the valve body in the reverse direction. A hot and cold water mixing valve is known in which the inflow ratio of water and hot water is changed by greatly changing the opening degree of the water.
FIG. 6 shows a specific example.

In the figure, reference numerals 200 and 202 denote a water inlet and a hot water inlet formed in the valve case 204, and 206 denotes a water side valve part 208 and a hot water side valve part 210 which are provided apart from each other in the axial direction. The valve body includes a connecting portion 212 that is connected to the valve case 204 and is provided in the valve case 204 so as to be movable in the axial direction.
The valve case 204 is provided with a water side valve seat 214 and a hot water side valve seat 216 at the respective axially inner positions corresponding to the water side valve portion 208 and the hot water side valve portion 210, respectively. The water side valve portion 208 and the hot water side valve portion 210 are in contact with each other.

Here, each of the water side valve portion 208 and the hot water side valve portion 210 has a cylindrical shape.
As shown in the partially enlarged view of FIG. 6, the water side valve portion 208 has an annular holding groove 232 that is continuous in the circumferential direction at the axially intermediate position of the outer peripheral surface, and has elasticity there. A seal member 234 having a U-shaped cross section is held.
The water-side valve portion 208 and the valve case 204 are sealed in a watertight manner by the elastic contact between the seal member 234 and the inner peripheral surface of the valve case 204.
Here, the seal member 234 is provided to the right in the drawing, that is, the concave portion is directed to the right in the drawing on the side opposite to the water inlet 200.

  In the water side valve portion 208, the right portion in the drawing from the holding groove 232 has a larger diameter than the left portion. Specifically, the portion from the holding groove 232 to the shaft end on the opposite side of the water side valve seat 214 is entirely relative to the portion from the left shaft end to the holding groove 232 in the drawing on the water side valve seat 214 side. The large diameter portion 236 forms a sliding guide that slides against the inner peripheral surface of the valve case 204.

  As a result, in the water side valve portion 208, the large-diameter portion on the right side of the holding groove 232 in the drawing has a stepped shape with respect to the small-diameter portion on the left side in the drawing. In the figure, reference numeral 238 denotes a radial stepped surface at the left end of the large diameter portion 236 in the figure.

The hot water side valve portion 210 is also formed with an annular holding groove 240 at an axially intermediate position on the outer peripheral surface thereof, and an elastic U-shaped seal member 242 is held there, and this seal A member 242 seals between the hot water side valve portion 210 and the valve case 204 in a watertight manner.
However, in this hot water side valve portion 210, a sealing member 242 having a U-shaped cross section is provided toward the hot water inlet 202 (specifically, the concave portion faces the hot water inlet 202) (water In the side valve portion 208, a seal member 234 is provided on the side opposite to the water inlet 200).

  The hot water side valve portion 210 has a larger diameter on the entire left side than the holding groove 240 in the drawing relative to the right side portion, and the large diameter portion 244 slides on the inner peripheral surface of the valve case 204. It constitutes a sliding guide.

  The valve body 206 is biased leftward in the figure by the bias spring 220, that is, in a direction to close the water-side valve portion 208, and a temperature-sensitive spring 224 made of a shape memory alloy provided in the mixing chamber 222. Therefore, it is biased in the direction opposite to the right in the figure, that is, in the direction to close the hot water side valve portion 210.

  The connecting portion 212 of the valve body 206 has a substantially cross-shaped cross section, and the water flowing in from the water inlet 200 is mixed between the plate-like portions 226 and 226 extending radially from the center portion. An internal passage 228 is formed to flow in the axial direction toward the chamber 222.

  The hot water that has flowed into the interior through the hot water inlet 202 flows to the mixing chamber 222 in the left direction in the figure, and after the water and hot water are mixed in the mixing chamber 222, the mixed water is left toward the water discharge portion. Flows out in the direction.

  Reference numeral 230 denotes a rotation operation shaft. By rotating this rotation operation shaft, the biasing force of the bias spring 220 is changed to be stronger or weaker. The balance position of the urging force with the warm spring 224 is shifted in the left-right direction. That is, the temperature of the mixed water in the hot / cold water mixing valve is set to the desired temperature or the setting is changed.

  In this hot and cold water mixing valve, the valve body 206 moves to the left in the drawing to the full position and the water side valve portion 208 contacts the water side valve seat 214, so that the water inlet 200 is fully closed and the hot water inlet 202 is fully open. Further, when the hot water side valve portion 210 contacts the hot water side valve seat 216 by moving in the reverse direction to the full, the hot water inlet 202 is fully closed and the water inlet 200 is fully opened.

In addition, the water inlet 200 and the hot water inlet 202 are opened at their intermediate positions, and the opening amounts thereof are changed to change the inflow amounts of water and hot water.
Specifically, when the rotary operation shaft 230 is rotated (forward rotation) while the hot water side valve portion 210 is fully closed and the water side valve portion 208 is fully open, the biasing force of the bias spring 220 is strengthened and the valve body. 206 is shifted to the left in the figure.
In the shifted state, the leftward biasing force by the bias spring 220 and the rightward biasing force by the temperature-sensitive spring 224 are balanced, and water and hot water flowing from the water inlet 200 and the hot water inlet 202 in that state are balanced. When the temperature of the mixed water fluctuates, the temperature-sensitive spring 224 increases or decreases the urging force accordingly, and the temperature-sensitive spring 224 slightly moves the valve body 206 in the left-right direction with axial expansion and contraction. Thereby, the temperature of mixed water is maintained at preset temperature.

On the other hand, when the one rotation operation shaft 230 is rotated in the reverse direction, the biasing force of the bias spring 220 is reduced, and thereby the valve body 206 is shifted rightward in the drawing. The mixed water temperature is adjusted by increasing or decreasing the biasing force based on the temperature sensing of the temperature-sensitive spring 224 at the shift position.
This kind of hot water mixing valve with an automatic temperature control function is disclosed in, for example, Patent Document 1 below.

Meanwhile there to the hot and cold water mixing valve, primarily water flowing from water inlet 200 flows along the direction shown in Figure 7 in an arrow P _1, but leading to the mixing chamber 222, a portion of the water inlet valve portion a minute clearance can flow in the direction indicated in Figure 7 arrow P ₂ through (gap) (the direction of the seal member 234 in the drawing right between the inner peripheral surface of the large diameter portion 236 and the valve case 204 in 208 is there).

For this case, the foreign matter of dust or sand in the water flowing in the direction indicated in Figure 7 in an arrow P ₂ is mixed, the clearance between the large diameter portion 236 and the valve case 204 is small, Fig. 7 (A), foreign matter may be caught there, and when such a biting occurs, the water-side valve portion 208, that is, the valve body 206 is moved against the valve case 204. Since the sticking occurs, the valve cannot be moved smoothly, and the temperature control operation due to the movement of the valve body 206 is hindered or the temperature control operation becomes unstable.

Further In the this hot and cold water mixing valve, when water flows from the water inlet 200, as shown in the drawing the arrow P ₂ direction at a high pressure (B), the water inlet valve portion 208 in its flow pressure drawing The temperature control operation is performed by the movement of the valve body 206 because the movement of the valve body 206 is affected by the viscosity when water flows through the minute clearance between the large diameter portion 236 and the valve case 204. There was also a problem that became unstable.

JP 2001-4050 A

  The present invention has been made for the purpose of providing a hot and cold water mixing valve capable of smoothly moving a valve body and stably performing a temperature control operation by the movement of the valve body in the background as described above. It is.

  Thus, according to the first aspect of the present invention, (a) a water inlet and a hot water inlet provided in the valve case so as to be separated in the axial direction; and (b) an axial direction corresponding to the water inlet and the hot water inlet. A cylindrical water-side valve portion and a hot water-side valve portion, each of which is provided with a seal member elastically contacting the inner peripheral surface of the valve case in an annular holding groove that is provided apart and extends in the circumferential direction of the outer peripheral surface A valve body provided in the valve case so as to be movable in the axial direction; and (c) a water-side valve provided in the valve case, wherein the water-side valve portion and the hot water-side valve portion are in contact with each other in the axial direction. A seat, a hot water side valve seat, (d) a mixing chamber in which water and hot water from the water inlet and the hot water inlet are mixed, and (e) an axial direction in response to the temperature of the mixed water in the mixing chamber. A temperature sensing element that expands and contracts and automatically adjusts the position of the valve element; and (f) a bias spring that biases the valve element in a direction to contract the temperature sensing element. The opening of the water inlet is reduced by one movement in the direction, and the opening of the hot water inlet is greatly changed, and the opening of the hot water inlet is reduced by moving the valve body in the reverse direction. In a hot and cold water mixing valve that changes the inflow ratio of water and hot water by greatly changing the opening degree, at least the outer peripheral surface of the water side valve portion from the holding groove to the shaft end opposite to the water side valve seat. Protruding ridges projecting radially outward are provided at a plurality of locations in the circumferential direction, and the ridges serve as sliding guides with respect to the inner peripheral surface of the valve case of the water side valve portion, A recess extending from the holding groove to the shaft end is formed in a portion between the protrusion and the protrusion.

  According to the second aspect of the present invention, (a) a water inlet and a hot water inlet provided in the valve case so as to be separated from each other in the axial direction, and (b) spaced apart in the axial direction corresponding to the water inlet and the hot water inlet. A cylindrical water-side valve portion and a hot water-side valve portion, each of which is provided with a sealing member that elastically contacts the inner peripheral surface of the valve case in an annular holding groove that extends in the circumferential direction of the outer peripheral surface, A valve body provided so as to be movable in the axial direction within the case; and (c) a water side valve seat and hot water provided in the valve case, wherein the water side valve part and the hot water side valve part are in contact with each other in the axial direction. A side valve seat, (d) a mixing chamber in which water and hot water from the water inlet and hot water inlet are introduced and mixed, and (e) expansion and contraction in the axial direction in response to the mixed water temperature in the mixing chamber, A temperature sensing body that automatically adjusts the position of the valve body; and (f) a bias spring that biases the valve body in a direction in which the temperature sensing body contracts, and the axial direction of the valve body The opening of the water inlet is reduced by one movement, the opening of the hot water inlet is greatly changed, and the opening of the hot water inlet is reduced by moving the valve body in the reverse direction. In a hot and cold water mixing valve that changes the inflow ratio of water and hot water by greatly changing the flow rate, at least the shaft end of the outer peripheral surface of the water side valve portion opposite to the water side valve seat is radially outward. It becomes an annular projecting portion, and the projecting portion serves as a sliding guide for the inner peripheral surface of the valve case of the water side valve portion, while the portion from the holding groove on the outer peripheral surface to the projecting portion is projected. A small diameter portion having a small diameter with respect to the portion is formed, and an annular recess is formed between the small diameter portion and the inner peripheral surface of the valve case.

  According to a third aspect of the present invention, in the second aspect, a radial through hole communicating with the annular recess is provided in a portion between the holding groove and the protrusion of the water side valve portion. Features.

Effects and effects of the invention

  As described above, according to the present invention, at least on the outer peripheral surface of the water-side valve portion, the protrusion that protrudes radially outward is provided in the circumferential direction from the holding groove to the shaft end opposite to the water-side valve seat. The protrusion is used as a sliding guide for the valve case, while a recess extending from the holding groove to the shaft end is formed between the protrusion and the protrusion. According to the invention, when the water flowing in from the water inlet passes through the seal member in the direction opposite to the water side valve seat, the recess between the ridge formed on the outer peripheral surface of the water side valve seat. Can pass in the axial direction as a water passage.

  At this time, foreign matters such as dust and sand mixed in the water can also pass through the recess between the water side valve portion and the valve case together with the water, so that the foreign matter mixed in the water The water-side valve part, and by extension, the valve element is stuck to the valve case by being caught between the outer peripheral surface of the water-side valve part and the inner peripheral surface of the valve case, and the temperature is adjusted by the movement of the valve element. It is possible to solve the conventional problems that the operation becomes unstable and the temperature adjustment operation is hindered, and it is possible to ensure a stable temperature adjustment operation by the smooth movement of the valve body.

  In addition, when the water flowing in from the water inlet flows in the same direction, the flow pressure acting on the water side valve portion can be reduced, and water due to the viscosity of water when water flows between the water side valve portion and the valve case. The influence on the side valve portion, that is, the valve body can be suppressed as small as possible, and thereby, the temperature control operation by the movement of the valve body can be performed smoothly and stably.

  Next, a second aspect of the present invention provides a shaft end portion of the outer peripheral surface of the water side valve portion opposite to the water side valve seat as a radially outward annular protrusion portion, and the protrusion portion is slid against the valve case. In this case, the portion from the holding groove on the outer peripheral surface to the protruding portion becomes a small diameter portion, and an annular recess is formed between the small diameter portion and the inner peripheral surface of the valve case. Even when water mixed with foreign matter flows over the seal member and flows between the water side valve portion and the valve case, the foreign matter can be accommodated in the annular recess. It is possible to solve the problem that the temperature adjustment operation due to the movement of the valve body becomes unstable due to the biting of the foreign matter. That is, smooth movement of the valve body can be ensured, and stable temperature control operation can be ensured.

In this case, it is desirable to provide a radial through-hole communicating with the annular recess in a portion between the holding groove and the protrusion of the water side valve portion.
If it does in this way, it will become possible to discharge | emit quickly the foreign material which entered in the annular recess to the inside of the water side valve part through the through-hole, and the amount will increase gradually as the foreign material remains in the annular recess. As a result, it is possible to avoid the problem that the foreign object is finally bitten.

  In addition, since the water that has entered the annular recess can be discharged to the inside of the water-side valve portion through the through hole, the flow pressure acting on the water-side valve portion, more specifically the annular protrusion, can be reduced, and the water The influence on the movement of the water-side valve portion due to the viscosity can be suppressed to be small, and the temperature control operation by the movement of the valve body can be further stabilized.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a hot water mixing valve with an automatic temperature control function of this embodiment (thermostat type), and 12 is a valve case having a cylindrical shape.
The valve case 12 has a first member 12-1 and a second member 12-2, which are screwed in the axial direction.
Here, the first member 12-1 and the second member 12-2 are watertightly sealed by an O-ring 14 having elasticity as a seal member.

The valve case 12 is formed with a water inlet 16 and a hot water inlet 18 penetrating the valve case 12 in and out of the valve case 12 at positions separated from each other in the axial direction. Hot water flows into the valve case 12.
A valve body 20 is provided inside the valve case 12 so as to be movable in the left-right direction (axial direction) in the figure.
The valve body 20 includes a water side valve portion 22 and a hot water side valve portion 24 that are provided apart in the axial direction, and a connecting portion 26 that connects them in the axial direction.

The connecting portion 26 includes a central cylindrical portion 28 and a plurality (four in this case) of plate-like arms 30 that extend radially from the outer peripheral surface of the cylindrical portion 28 so as to form a cross shape as a whole.
Between each arm 30 and 30, there is an internal passage 32 through which water flowing from the water inlet 16 and hot water flowing from the hot water inlet 18 flow toward the mixing chamber 34.

The water and hot water flowing into the mixing chamber 34 are mixed there and flow out to the left in the figure through the outflow portion 36.
The mixing chamber 34 accommodates a coil-shaped temperature-sensitive spring 38 made of a shape memory alloy, and the urging force thereof is directed rightward in the drawing with respect to the valve body 20, that is, the hot water side valve portion 24 is closed. It exerts in the direction of opening the side valve portion 22.

  The temperature-sensitive spring 38 made of shape memory alloy expands and contracts according to the temperature of the mixed water inside the mixing chamber 34, and changes the rightward biasing force in the drawing. Then, the position of the valve body 20 is automatically finely adjusted so that the mixed water temperature becomes the set temperature.

  Reference numeral 40 denotes a spring receiver that forms the mixing chamber 34 and contacts one end of the temperature-sensitive spring 38. The spring holder 40 has an outward engaging claw 42 at the right end in the figure, and the engaging claw 42 is connected to the first member 12-. The first member 12-1 is assembled to be engaged with the first engagement hole 44.

In this embodiment, the connection part 26 in the valve body 20 is configured integrally with the hot water side valve part 24, and the water side valve part 22, which is separate from the connection part 26, is assembled in a fitted state. ing.
Specifically, as shown in FIG. 2, a female screw portion 50 is formed inside the cylindrical portion 28 in the connecting portion 26.

  On the other hand, the water side valve portion 22 is provided with a fitting portion 46 having a circular cross section and an inward flange portion 48, and the fitting portion 46 is fitted in the right end in the figure of the connecting portion 26 in an external fitting state. Are combined. In this state, a male screw portion 52 formed at the tip of a valve shaft 100 described later is screwed leftward in the figure into the female screw portion 50 of the connecting portion 26.

  Here, the valve shaft 100 is provided with a retaining ring 56 (here, an E-ring) having elasticity in the radial direction in the annular groove 54, and the male screw portion 52 of the valve shaft 100 is connected to the female screw portion 50 inside the cylindrical portion 28. The water side valve portion 22 is pressed to the connecting portion 26 leftward in the figure by the retaining ring 56 and is firmly fixed to the connecting portion 26 integral with the hot water side valve portion 24.

The valve case 12 includes water side valve portions 58 and hot water side valve portions 58 respectively corresponding to the water side valve portion 22 and the hot water side valve portion 24 at inner positions in the axial direction of the water side valve portion 22 and the hot water side valve portion 24. A seat 60 is provided, and the water side valve portion 22 and the hot water side valve portion 24 abut against them in the axial direction.
The state in which the water-side valve portion 22 is in contact with the water-side valve seat 58 is a closed state of the water-side valve portion 22, and the hot-water side valve portion 24 is in contact with the hot-water side valve seat 60 in the axial direction. The state is the valve closing state of the hot water side valve portion 24.

As shown in FIG. 1, a rotation operation shaft 62 is assembled to the valve case 12.
The rotation operation shaft 62 is for moving the valve body 20 in the axial direction inside the valve case 12, that is, in the horizontal direction in the figure, and setting the mixed water temperature. The fitting shaft 63 is rotatably fitted in the fitting hole 66 of the valve case 12. Here, a space between the fitting shaft portion 63 and the fitting hole 66 of the valve case 12 is sealed watertight by an O-ring 68.

  In addition, a handle (not shown) in the serration portion 70 is connected to the handle connection portion 64 protruding to the right in the axial direction from the valve case 12 in an integrally rotated state.

  The rotary operation shaft 62 has a large-diameter cylindrical portion 72 inside the valve case 12, and is elastic in the radial direction attached to the rotary operation shaft 62 and the shoulder portion at the right end of the cylindrical portion 72 in the drawing. The valve case 12 is sandwiched in the axial direction by a retaining ring 74 having the same.

A female screw portion 78 is formed on the inner peripheral surface of the cylindrical portion 72, and a cylindrical driving member 80 is screwed to the male screw portion 82 on the outer peripheral surface.
The drive member 80 is moved forward and backward in the axial direction, that is, in the left-right direction in the figure by screw feed by the rotation operation of the rotation operation shaft 62.

A bias spring 88 made of a normal metal coil spring is interposed between the drive member 80 and the valve body 20 via a stopper ring 84 and a spring receiver 86. The bias spring 88 is a valve body. 20, a biasing force is exerted in the left direction in the figure opposite to the temperature-sensitive spring 38.
Specifically, the urging force is exerted on the valve body 20 in the direction in which the hot water side valve portion 24 is opened and the water side valve portion 22 is closed.

The spring receiver 86 is provided with inward flange portions 90 and 92 at the left end and the right end in the drawing.
On the other hand, the drive member 80 is provided with an outward flange portion 94 at the left end in the drawing, and this outward flange portion 94 is arranged between the pair of flange portions 90 and 92 in the left-right direction in the drawing. Relative movement is possible.
Further, the drive member 80 is provided with a stepped portion 96 protruding inward, and a stopper ring 84 is brought into contact with the stepwise portion in the right direction in the drawing.

A valve shaft 100 extends from the valve body 20 to the right in the drawing.
The right end side of the valve shaft 100 penetrates the stopper ring 84 and protrudes rightward in the figure, and a head 98 having a diameter larger than the inner diameter of the stopper ring 84 is provided at the protruding end.
The head 98 is provided with an engaging groove that becomes a tool hook when the male threaded portion 52 of the valve shaft 100 is screwed into the female threaded portion 50 of the connecting portion 26.

In this embodiment, when the rotary operation shaft 62 is rotated in the forward direction, the drive member 80 is advanced to the left in the figure by a screw feed action, and thereby the bias spring 88 is compressed via the stopper ring 84 and the valve The urging force toward the left in the figure on the body 20 is increased.
When the rotation operation shaft 62 is rotated in the reverse direction, the drive member 80 is moved backward in the right direction in the figure, and is displaced in the direction in which the bias spring 88 extends, thereby weakening the urging force in the left direction in the figure. .

  In the hot / cold water mixing valve 10 of this embodiment, the rotary operation shaft 62 is rotated in the forward direction or the reverse direction in this way, so that the valve body 20 is biased to the left in the drawing of the bias spring 88 and the temperature sensitive spring. It is shifted in the left-right direction to a position where the rightward biasing force in FIG. That is, the temperature of the mixed water in the hot / cold water mixing valve 10 is set or changed.

Specifically, in the hot water / water mixing valve 10, the valve body 20 moves to the left in the drawing as much as possible, and the water side valve portion 22 contacts the water side valve seat 58, whereby the water inlet 16 is fully closed and the hot water inlet 18. Is fully opened, and the valve body 20 moves in the reverse direction to the full position so that the hot water side valve portion 24 contacts the hot water side valve seat 60, whereby the hot water inlet 18 is fully closed and the water inlet 16 is fully opened.
Further, the water inlet 16 and the hot water inlet 18 are opened at an intermediate position between them, and the opening degree thereof is automatically changed based on the temperature sensing of the temperature sensing spring 38 to change the inflow amount of water and hot water to change the mixed water. The temperature is automatically adjusted to the set temperature.

As shown in FIGS. 2 and 3, an annular holding groove 102 continuous in the circumferential direction is provided at an axially intermediate position of the outer peripheral surface of the water-side valve portion 22, and there is a U-shaped cross section therein. An elastic sealing member 104 is attached.
Here, the seal member 104 is assembled to the right in the drawing, that is, with the concave portion facing away from the water inlet 16.

An annular projecting portion 106 projecting in the radial direction is provided at the left end portion of the outer peripheral surface of the water side valve portion 22 in the drawing, that is, the shaft end portion on the water side valve seat 58 side.
Here, the protruding portion 106 has a diameter substantially the same as or slightly smaller than the inner diameter of the valve case 12. A portion between the protruding portion 106 and the holding groove 102 on the outer peripheral surface of the water side valve portion 22 has a small diameter with respect to the protruding portion 106.

On the other hand, the portion on the right side in the drawing with respect to the holding groove 102 on the outer peripheral surface of the water side valve portion 22, that is, the portion between the holding groove 102 and the shaft end opposite to the water side valve seat 58 is radially outward. Protruding ridges 108 are provided at a plurality of locations (here, 6 locations) at predetermined intervals in the circumferential direction.
Here, each protrusion 108 is formed over the entire length from the holding groove 102 to the shaft end on the right side in the drawing.
Further, as shown in FIG. 3B, these protrusions 108 have a mountain shape in which the cross-sectional shape becomes narrower toward the outer side in the radial direction.

These ridges 108 slide on the inner peripheral surface of the valve case 12 to guide the movement of the water side valve portion 22 when the water side valve portion 22 moves in the axial direction in the valve case 12. That is, the protrusions 108 form a sliding guide for the water-side valve portion 22 with respect to the valve case 12. In this embodiment, the protrusions 108 have a mountain-shaped cross section. Almost linear contact is made with the inner peripheral surface. Therefore, the sliding resistance when each protrusion 108 performs the sliding guide is small.
Each protrusion 108 is set so that its protruding height is substantially in contact with the inner surface of the valve case 12.

  Of the outer peripheral surface of the water-side valve portion 22, the portion between the protrusions 108 and 108 on the right side in the drawing with respect to the holding groove 102 is axially extended from the holding groove 102 to the shaft end on the right side in the drawing. The recess 110 extends in the direction.

On the other hand, as shown in FIG. 2, also in the hot water side valve portion 24, an annular holding groove 112 continuous in the circumferential direction is formed at an axially intermediate position of the outer circumferential surface thereof, and a U-shaped cross section is formed there. A sealing member 114 having a shape is attached.
However, in the hot water side valve portion 24, the seal member 114 is assembled with the concave portion facing the hot water inlet 18.

  Therefore, in the hot water side valve portion 24, it is difficult for hot water flowing in from the hot water inlet 18 to flow leftward in the figure, that is, toward the mixing chamber 34, beyond the seal member 114. This is because the sealing member 114 having a U-shaped cross section is deformed by the flow of hot water from the hot water inlet 18 so as to open outward in the radial direction, thereby increasing the sealing force.

In the hot water side valve portion 24, an annular protrusion that protrudes radially outward at the shaft end portion on the right side in the drawing from the holding groove 112 on the outer peripheral surface, that is, on the side closer to the hot water side valve seat 60. A portion 116 is provided, and a portion between the protruding portion 116 and the holding groove 112 has a small diameter with respect to the protruding portion 116.
The protrusion 116 is also substantially the same diameter or slightly smaller in diameter than the inner diameter of the valve case 12, so that a portion between the protrusion 116 and the holding groove 112 is between the inner peripheral surface of the valve case 12. A certain large annular gap is formed.

On the other hand, the portion on the left side in the drawing with respect to the holding groove 112 on the outer peripheral surface in the hot water side valve portion 24, that is, the portion on the opposite side to the hot water side valve seat 60 has a larger diameter than the portion on the right side in the drawing. In the figure, 118 represents the large diameter portion.
The large diameter portion 118 serves as a sliding guide with respect to the valve case 12 of the hot water side valve portion 24. When the hot water side valve portion 24 moves on the inner peripheral surface of the valve case 12 in the axial direction, The diameter portion 118 slides on the inner surface of the valve case 12 to provide movement guidance.
Therefore, the large diameter portion 118 has a diameter that substantially contacts the inner peripheral surface of the valve case 12.

According to the present embodiment as described above, it flows flowing from water inlet 16 as shown in FIG. 4 the water exceeds the seal member 104 in the opposite P ₂ direction to the water-side valve seat 58, water A recess 110 formed between the protrusion 108 and the protrusion 108 formed on the outer peripheral surface of the side valve portion 22 can pass in the axial direction as a large water passage.

At this time, as shown in FIG. 4, foreign matters such as dust and sand mixed in the water may also pass through the recess 110 between the water side valve portion 22 and the valve case 12 together with water. Therefore, the foreign matter mixed in the water is caught between the outer peripheral surface of the water-side valve portion 22 and the inner peripheral surface of the valve case 12, so that the water-side valve portion 22, and thus the valve body 20 becomes the valve case. 12 can be fixed, and the temperature control operation due to the movement of the valve body 20 becomes unstable or the temperature control operation is hindered. It is possible to ensure the controlled temperature operation.
Further, when the water flowing from the water inlet 16 flows in the P ₂ direction, flow pressure acting on the water-side valve portion 22 together can be reduced, when flowing between the water-side valve portion 22 and the valve case 12 is water The influence of the water viscosity on the water-side valve portion 22, that is, the valve body 20, can be suppressed as small as possible, thereby enabling the temperature control operation by the movement of the valve body 20 to be performed smoothly and stably. .

Next, FIG. 5 shows another embodiment of the present invention.
In this embodiment, the shaft end on the right side of the outer peripheral surface of the water-side valve portion 22 in the drawing, that is, the shaft end opposite to the water-side valve seat 58 is a radially outward annular protrusion 119. The protruding portion 119 serves as a sliding guide for the inner peripheral surface of the valve case 12 of the water side valve portion 22, while the portion from the holding groove 102 to the protruding portion 119 on the outer peripheral surface is relative to the protruding portion 119. A small-diameter portion having a small diameter is formed, and an annular recess 120 is formed between the small-diameter portion and the inner peripheral surface of the valve case 12.

Further, the water side valve portion 22 is provided with radial through holes 122 communicating with the annular recess 120 at a plurality of locations in the circumferential direction between the holding groove 102 and the protruding portion 119.
In this embodiment as well, the protruding portion 119 serving as a sliding guide in the water side valve portion 22 has an outer diameter substantially in contact with the inner surface of the valve case 12.

  Even in the present embodiment, even when water mixed with foreign matter flows over the seal member 104 and flows between the water-side valve portion 22 and the valve case 12, the foreign matter is accommodated in the annular recess 120. It is possible to solve such a problem that the foreign matter is caught between the water side valve portion 22 and the valve case 12 and the foreign matter becomes unstable due to the movement of the valve body 20. Can do. That is, smooth movement of the valve body 20 can be ensured, and stable temperature control operation can be ensured.

  Further, in this case, since the radial through hole 122 communicating with the annular recess 120 is provided in the portion between the holding groove 102 and the protruding portion 106 of the water side valve portion 22, the annular recess 120 is provided. The foreign matter that has entered the inside can be quickly discharged to the inside of the water-side valve portion 22 through the through-hole 122, and the amount of foreign matter remains in the annular recess 120 and gradually increases. Can avoid the problem of biting the foreign object.

  Further, since the water that has entered the annular recess 120 can be discharged to the inside of the water side valve portion 22 through the through hole 122, the flow pressure acting on the water side valve portion 22, specifically the annular protrusion portion 106, is increased. In addition, the influence on the movement of the water side valve portion 22 due to the viscosity of water can be suppressed to be small, and the temperature control operation due to the movement of the valve body 20 can be further stabilized.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the present invention can be applied to the hot water side valve portion, and the protrusion 108 is formed over the entire length between the holding groove 102 and the shaft end in the first embodiment. It is also possible to form the protrusion 108 with a shorter length than this, and a radial through hole communicating with the recess 110 may be provided between the protrusion 108 and the protrusion 108. .
Furthermore, although the protrusion 108 extends in a direction parallel to the axial direction in the above embodiment, it may be slightly inclined with respect to the axial direction depending on the case, and in the second embodiment, the through hole communicated with the annular recess 120. 122 is provided, but the present invention can be configured in various modifications without departing from the spirit of the present invention, such as the omission of the through-hole 122 in some cases.

It is sectional drawing of the hot and cold water mixing valve which is one embodiment of the present invention. It is sectional drawing which decomposes | disassembles and shows the principal part in the same embodiment. It is a single item figure of the water side valve part in the embodiment. It is operation | movement explanatory drawing of the embodiment. It is the figure which showed the water side valve part in other embodiment of this invention with the effect | action. It is a figure which shows an example of the conventional hot water mixing valve. It is a figure for demonstrating the malfunction of the hot water mixing valve of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water mixing valve 12 Valve case 16 Water inlet 18 Hot water inlet 20 Valve body 22 Water side valve part 24 Hot water side valve part 34 Mixing chamber 38 Temperature-sensitive spring 58 Water side valve seat 60 Hot water side valve seat 88 Bias springs 102, 112 Holding groove 104, 114 Seal member 108 Projection 110 Recess 116, 119 Protruding portion 120 Annular recess 122 Through-hole

Claims (3)

(B) A water inlet and a hot water inlet provided in the valve case so as to be separated from each other in the axial direction, and (b) A water inlet and a hot water inlet provided in the axial direction so as to correspond to the water inlet and the hot water inlet. A cylindrical water-side valve portion and a hot water-side valve portion each holding a sealing member that elastically contacts the inner peripheral surface of the valve case is provided in an annular holding groove extending in the direction, and moves in the axial direction within the valve case And (c) a water side valve seat and a hot water side valve seat which are provided in the valve case and contact the water side valve portion and the hot water side valve portion in the axial direction, respectively. A mixing chamber in which water and hot water from the water inlet and the hot water inlet are introduced and mixed, and (e) an axial expansion and contraction in response to the temperature of the mixing water in the mixing chamber to adjust the position of the valve body. A temperature sensor that automatically performs, and (f) a bias spring that biases the valve body in a direction in which the temperature sensor is contracted, by one movement of the valve body in the axial direction. The opening of the water inlet is reduced, the opening of the hot water inlet is changed greatly, and the opening of the hot water inlet is reduced by moving the valve body in the reverse direction, and the opening of the water inlet is changed greatly. In the hot and cold water mixing valve that changes the inflow ratio of water and hot water, at least in the outer peripheral surface of the water side valve portion, in the radial direction, from the holding groove to the shaft end opposite to the water side valve seat Protruding ridges protruding outward are provided at a plurality of locations in the circumferential direction, and the ridges serve as sliding guides with respect to the inner peripheral surface of the valve case of the water side valve portion. A hot water / water mixing valve characterized in that a recess extending from the holding groove to the shaft end is formed in an intermediate portion. (B) A water inlet and a hot water inlet provided in the valve case so as to be separated from each other in the axial direction, and (b) A water inlet and a hot water inlet provided in the axial direction so as to correspond to the water inlet and the hot water inlet. A cylindrical water-side valve portion and a hot water-side valve portion each holding a sealing member that elastically contacts the inner peripheral surface of the valve case is provided in an annular holding groove extending in the direction, and moves in the axial direction within the valve case And (c) a water side valve seat and a hot water side valve seat which are provided in the valve case and contact the water side valve portion and the hot water side valve portion in the axial direction, respectively. A mixing chamber in which water and hot water from the water inlet and the hot water inlet are introduced and mixed, and (e) an axial expansion and contraction in response to the temperature of the mixing water in the mixing chamber to adjust the position of the valve body. A temperature sensor that automatically performs, and (f) a bias spring that biases the valve body in a direction in which the temperature sensor is contracted, by one movement of the valve body in the axial direction. The opening of the water inlet is reduced, the opening of the hot water inlet is changed greatly, and the opening of the hot water inlet is reduced by moving the valve body in the reverse direction, and the opening of the water inlet is changed greatly. In the hot and cold water mixing valve for changing the inflow ratio of water and hot water, at least the axial end portion of the outer peripheral surface of the water side valve portion opposite to the water side valve seat is radially outwardly projecting The projecting portion serves as a sliding guide with respect to the inner peripheral surface of the valve case of the water side valve portion, and the portion of the outer peripheral surface from the holding groove to the projecting portion has a small diameter with respect to the projecting portion. A hot water mixing valve, characterized in that an annular recess is formed between the small diameter portion and the inner peripheral surface of the valve case.   3. The hot and cold water mixing valve according to claim 2, wherein a radial through hole communicating with the annular recess is provided in a portion between the holding groove and the protrusion of the water side valve portion.

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