JP2009121589A - Automatic temperature-adjustable hot and cold water mixing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic temperature-adjustable hot and cold water mixing valve capable of sufficiently closing a hot water passage or a waterway on the upstream side of a mixing valve when water cutoff or hot water cutoff is caused, and enabling the closure without particularly enlarging a temperature sensing spring formed of a shape memory alloy. <P>SOLUTION: This automatic temperature-adjustable hot and cold water mixing valve 10 has the mixing valve 26, the temperature sensing spring 40 formed of the shape memory alloy and a bias spring 44. A pressure operating valve 52 separate from the mixing valve 26 and operating in the direction for closing the hot water passage 20 or the waterway 18 on the high pressure side based on a pressure difference between water pressure and hot water pressure on the upstream side of the mixing valve 26 generated in water cutoff or hot water cutoff is arranged on the upstream side of the mixing valve 26. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot / cold water mixing valve, and more particularly to an automatic temperature control type hot / cold water mixing valve that automatically adjusts the mixed water temperature to a set temperature using a temperature sensitive spring made of a shape memory alloy as a temperature sensing element.

Conventionally, as a hot and cold water mixing valve, an automatic temperature control type (thermostat type) hot and cold water mixing valve having a function of automatically adjusting the temperature of mixed water to a set temperature has been widely used.
As this automatic temperature control type hot and cold water mixing valve, the conventional one shown in FIG. 15 is known.

In FIG. 15, 300 and 302 are a water inlet and a hot water inlet provided in the valve casing 304, respectively, and 305 and 306 are a water channel and a hot water channel following the water inlet 300 and the hot water inlet 302, respectively.
Reference numeral 308 denotes a mixing valve, which integrally includes a water side main valve 310 and a hot water side main valve 312, and with the water side main valve 310 and the hot water side main valve 312 open, Water and hot water are introduced into the interior through the passage 306, mixed in the mixing chamber 314, and the mixed water flows out from the outlet 316 and is discharged from a predetermined water discharge portion.

318 is a temperature-sensitive spring made of a shape memory alloy coil spring provided in the mixing chamber 314. The right end of the drawing is in contact with the mixing valve 308, and the water-side main valve 310 is opened with respect to the mixing valve 308. Is exerting a biasing force.
The temperature-sensitive spring 318 extends in the axial direction when the temperature of the mixed water in the mixing chamber 314 rises above the set temperature, and increases the rightward biasing force on the mixing valve 308 in the drawing.

  Further, the urging force of the first bias spring 320 and the second bias spring 322 is exerted on the mixing valve 308 in the direction opposite to the urging direction of the temperature-sensitive spring 318. The position is stopped at a position where the urging force by 318 and the urging force by the first bias spring 320 and the second bias spring 322 are balanced, and held there.

Reference numeral 324 denotes a rotating shaft portion that is connected to a rotating handle (not shown) in an integrally rotated state, and rotates by an operating force applied to the rotating handle. The rotating shaft portion 324 rotates in the forward direction or the reverse direction, so that The combined advance / retreat member 326 is moved back and forth in the left-right direction in the drawing.
As the advance / retreat member 326 moves forward / backward, the mixing valve 308 is forcibly moved in the left-right direction in the drawing via the first bias spring 320 and the second bias spring 322.

By this operation (mixed water temperature setting operation), the mixing valve 308 is positioned at the set temperature control position.
Under this state, water and hot water flow in from the water channel 305 and the hot water channel 306 at a predetermined ratio to be a mixed water having a desired temperature set and discharged from the water discharger.

In the hot and cold water mixing valve shown in FIG. 15, the automatic adjustment of the mixed water temperature is performed as follows.
That is, when the temperature of the mixed water in the mixing chamber 314 becomes higher than the set temperature, the temperature-sensitive spring 318 extends to increase the urging force, and the mixing valve 308 is positioned to the right in the figure by the increased urging force. Slightly move.
That is, the balance position of the biasing force by the temperature-sensitive spring 318 and the biasing forces in the opposite directions by the first bias spring 320 and the second bias spring 322 is shifted to the right in the figure, and the mixing valve 308 is slightly positioned in the same direction. Move.

  As a result, the valve opening of the water-side main valve 310 is increased, the valve opening of the hot-water main valve 312 is decreased, the hot water inflow amount is small, the water inflow amount is increased, and the mixed water temperature, that is, the discharged water temperature is lowered. The temperature of the mixed water, that is, the discharged water is automatically adjusted to the set temperature.

On the other hand, when the temperature of the mixed water in the mixing chamber 314 is lower than the set temperature, the temperature sensitive spring 318 contracts, thereby reducing the valve opening of the water side main valve 310 and the valve opening of the hot water side main valve 312. Is increased to automatically adjust the mixed water temperature to the set temperature.
In addition, this kind of hot and cold water mixing valve is disclosed in, for example, Patent Document 1 below.

  In the mixing valve of FIG. 15 in which the position of the mixing valve 308 is controlled by balancing the shape memory alloy temperature-sensitive spring 318, the first bias spring 320, and the second bias spring 322, the temperature of the mixed water is adjusted to an appropriate temperature. When water suddenly stops in a certain state, the temperature of the mixed water in the mixing chamber 314 rises, and the temperature-sensitive spring 318 extends, increasing the biasing force and moving the mixing valve 308 in the direction to close the hot water main valve 312. However, in the case of the temperature sensitive spring 318 made of a shape memory alloy, a force sufficient to completely close the hot water side main valve 312 cannot be generated. There was a problem that hot water leaked out.

Further, even when the hot water is cut off, a sufficient force for closing the water-side main valve 310 is not generated, causing a problem that water leaks.
In this case, the above-mentioned problem can be corrected by making the temperature-sensitive spring 318 a large spring. However, if this is done, the cost required for the temperature-sensitive spring 318 is increased, and the entire hot and cold water mixing valve is used. Not only increases in size but also increases the operation load when moving the mixing valve 308, resulting in a heavy operation.

  As an automatic temperature control type hot / cold water mixing valve, there is known a water pressure driven pilot type hot / cold water mixing valve that moves the mixing valve by water pressure following the forward / backward movement of the pilot valve. In this case, there is a problem that the runway cannot be closed at all in the event of a water outage.

  In addition, in the water pressure driven pilot-type hot / cold water mixing valve, when the water side main valve is fully opened and only cold water is discharged, the water pressure on the primary side of the mixing valve decreases due to the water side main valve being fully opened. A sufficient driving force for moving the mixing valve cannot be obtained. As a result, the hot water passage cannot be sufficiently closed, and hot water is likely to be mixed into cold water.

  Similarly, in a hot water pressure driven pilot-type hot / cold water mixing valve, when the hot water main valve is fully opened and only hot water is discharged, the hot water pressure on the upstream side of the mixing valve decreases due to the hot water main valve being fully opened. For this reason, a sufficient driving force for the mixing valve cannot be obtained, the water channel cannot be sufficiently closed by the mixing valve, and cold water is likely to be mixed into hot water.

In addition, there exist some which were disclosed by following patent document 2, patent document 3, and patent document 4 as prior art with respect to this invention.
However, those described in these documents do not show the problem to be solved by the present invention, and the means for solving the problem is also different from the present invention.

JP 2000-2360 A Japanese Patent No. 3447054 JP 2003-269650 A JP-A-2-195085

The present invention is based on the above situation, and when a water outage or a water outage occurs, the water channel or the water channel can be sufficiently closed on the upstream side of the mixing valve, and the shape memory alloy is used as a temperature sensing element. The purpose of the present invention is to provide an automatic temperature control type hot and cold water mixing valve that can realize this without particularly increasing the size of the temperature sensitive spring.
Another object of the present invention is to effectively prevent the leakage of hot water and water when discharging cold water or hot water in a water pressure driven or hot water driven pilot type automatic temperature control type hot water mixing valve. An object of the present invention is to provide a hot and cold water mixing valve.

  Thus, according to the first aspect of the present invention, (a) a water-side main valve and a hot water-side main valve are provided, and the valve openings of the water-side main valve and the hot water-side main valve are changed in magnitude in an inverse relationship. A mixing valve for changing the mixing ratio of hot water, and (b) increasing the biasing force in the direction of opening the water side main valve and closing the hot water side main valve in response to an increase in the temperature of the mixing water, and positioning the mixing valve A temperature-sensitive spring made of a shape memory alloy to be moved, and (c) in a direction to move the mixing valve in a direction to close the water-side main valve and open the hot-water side main valve, in a direction opposite to the temperature-sensitive spring. An automatic temperature control type hot and cold water mixing valve comprising a bias spring for applying an urging force is provided separately from the mixing valve on the upstream side of the mixing valve. A pressure operated valve that operates in the direction to close the high-pressure side water channel or water channel based on the pressure difference between the upstream water pressure and the hot water pressure is provided. The features.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pressure actuated valve is a valve that operates in a direction to selectively close either the hot water channel or the water channel on the high pressure side. And

  According to a third aspect of the present invention, in the first aspect, the pressure operating valve is a valve that operates in a direction to close only one of the hot water channel or the water channel when the one is on the high pressure side. It is characterized by.

  According to a fourth aspect of the present invention, in the third aspect, the pressure operating valve is a valve that operates in a direction in which only the side of the hot water channel is closed, and the pressure operating valve has a direction in which the hot water channel is closed. A water-side primary pressure chamber that is provided with a forward-side pressure receiving surface that receives pressure in the forward direction and a reverse-side pressure-receiving surface that receives pressure in the reverse direction that is the reverse direction; A hot water side secondary pressure chamber communicating with the secondary side of the pressure operating valve in the hot water passage is provided, and the pressure of the hot water side secondary pressure chamber is applied to the forward side pressure receiving surface and the water side 1 The pressure of the secondary pressure chamber is caused to act on the receding side pressure receiving surface, and the pressure operating valve is operated by a pressure difference between the hot water side secondary pressure chamber and the water side primary pressure chamber. It is characterized by that.

  According to a fifth aspect of the present invention, in the third aspect, the pressure-actuated valve is a valve that operates in a direction to close only the water channel side, and the pressure-actuated valve is advanced in a direction to close the water channel. A forward pressure receiving surface receiving pressure in the direction and a backward pressure receiving surface receiving pressure in the reverse direction which is the reverse direction, and a hot water primary pressure chamber communicating with the primary side of the hot water channel; A water side secondary pressure chamber communicating with the secondary side of the pressure actuating valve in the water channel is provided, and the pressure of the water side secondary pressure chamber is applied to the forward pressure receiving surface and the hot water side primary pressure. Chamber pressure is applied to the receding side pressure receiving surface, and the pressure actuated valve is operated by a pressure difference between the water side secondary pressure chamber and the hot water side primary pressure chamber. Features.

  According to a sixth aspect of the present invention, in the fourth aspect, the mixing valve is a valve that integrally includes the water-side main valve and the hot water-side main valve, and (a) a small introduction to the primary side of the water channel. A water-side back pressure chamber that communicates through a hole and causes the internal pressure to act on the mixing valve as a pressing force in a direction to close the water-side main valve; and (b) water in the water-side back pressure chamber is A water side pilot passage as a pressure release passage that is drawn downstream of the side main valve, and (c) a water side pilot valve that moves forward and backward in a direction that changes the opening of the water side pilot passage. The mixing valve is a hydraulically driven valve that moves forward and backward in the same direction following the forward and backward movement of the water-side pilot valve.

  According to a seventh aspect of the present invention, in the fifth aspect, the mixing valve is a valve integrally having the water side main valve and the hot water side main valve, and (a) is introduced to the primary side of the hot water channel. A hot water side back pressure chamber that communicates through a small hole and causes the internal pressure to act on the mixing valve as a pressing force in a direction to close the hot water side main valve; and (b) the hot water in the hot water side back pressure chamber A hot water side pilot passage as a depressurizing passage to be drawn downstream of the hot water side main valve, and (c) a hot water side pilot valve that moves forward and backward in a direction to change the opening degree of the hot water side pilot passage, The mixing valve is a hot water pressure driven valve that moves forward and backward in the same direction following the forward and backward movement of the hot water side pilot valve.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the pressure-actuated valve contacts the wall of the hot water channel or the water channel at the forward end in the forward direction to close the hot water channel or the water channel. It is characterized by being.

Effects and effects of the invention

  As described above, the present invention is separate from the mixing valve, and closes the hot water channel or water channel on the high pressure side based on the pressure difference between the water pressure on the upstream side of the mixing valve and the hot water pressure that occurs when water or water is cut off. A pressure-actuated valve that operates is provided.

  In the hot / cold water mixing valve of the present invention, when water breakage occurs while the temperature of the mixed water is adjusted to an appropriate temperature, the pressure of the water channel disappears upstream of the mixing valve. Based on the pressure difference from the pressure, the pressure operating valve operates in the direction of closing the hot water passage, and it is possible to effectively prevent the hot water from leaking into the mixing chamber through the hot water passage.

Or, when the hot water breaks out under the condition that the temperature of the mixed water is adjusted to an appropriate temperature, the hot water pressure disappears on the upstream side of the mixing valve, so the pressure operating valve operates in the direction to close the water channel on the high pressure side, It is possible to effectively prevent water (cold water) from leaking into the mixing chamber through the water channel.
That is, in the hot water / water mixing valve of the present invention, when the water is cut off or when the hot water is cut off, the water discharge can be substantially stopped by the action of the pressure operating valve.

  Therefore, it is not particularly necessary to increase the size of the temperature-sensitive spring in order to close the water channel or the water channel when water outage or water outage occurs. Problems such as an increase in the size of the mixing valve or a heavy operating load can be avoided.

  In the present invention, the pressure-actuated valve can be a valve that operates in a direction to selectively close either one of the hot water channel and the water channel that have become a high-pressure side due to water cut or hot water (Claim 2). ).

  Alternatively, according to the third aspect, the pressure actuated valve can be a valve that operates in a closing direction when only one of the hot water channel or the water channel is on the high pressure side (Claim 3).

  In this case, the pressure operating valve is a valve that operates in a direction that closes only the side of the hot water channel, and the pressure operating valve has a forward pressure receiving surface that receives pressure in the forward direction in the direction of closing the hot water channel, A reverse side pressure receiving surface for receiving pressure in the reverse direction is provided, and the water side primary pressure chamber communicated with the primary side of the water channel and the secondary side of the pressure operating valve in the hot water channel are communicated. A hot water side secondary pressure chamber is provided, and the pressure of the hot water side secondary pressure chamber is applied to the forward pressure receiving surface, the pressure of the water side primary pressure chamber is applied to the backward pressure receiving surface, The hot water side secondary pressure chamber and the water side primary pressure chamber can be operated by a pressure difference (claim 4).

  According to claim 5, the pressure actuated valve is a valve that operates in a direction to close only the side of the water channel, the hot water side primary pressure chamber communicating with the primary side of the water channel, and the pressure operated valve 2 in the water channel. The pressure actuated valve can be operated by a pressure difference with the water side secondary pressure chamber communicating with the secondary side (Claim 5).

  Next, a sixth aspect of the present invention is configured as a water pressure-driven pilot-type hot / cold water mixing valve that moves the mixing valve forward / backward by hydraulic pressure following the forward / backward movement of the water-side pilot valve. In the hot and cold water mixing valve according to the sixth aspect of the present invention, in addition to being able to close the hot water passage by the action of the pressure operating valve when water is shut off, the following effects are also achieved.

  In this water pressure driven pilot-type hot / cold water mixing valve, when the temperature of the discharged water is set to discharge only cold water, the water side main valve is almost fully opened, so that the primary side pressure of the water channel is lowered, so that the water pressure depends on the water pressure. The driving force of the mixing valve becomes insufficient, and the hot water passage cannot be sufficiently closed by the hot water main valve.

  However, in the hot and cold water mixing valve according to the sixth aspect, the pressure of the water-side primary pressure chamber acting on the pressure-operated valve is greatly reduced, so that the pressure-operated valve is moved forward by the pressure of the hot-side secondary pressure chamber. Since the hot water can be closed, it is possible to solve the problem that hot water leaking from the hot water under the setting of the cold water discharge is mixed into the discharged water.

  On the other hand, in claim 7, the hot and cold water mixing valve of claim 5 is configured as a hot water pressure driven pilot hot and cold water mixing valve. Even if the mixing valve cannot close the water channel sufficiently due to insufficient hot water driving force against the mixing valve when water is discharged, the side of the water channel Can be closed, which can solve the problem that water is mixed into the water discharge from the water channel under the setting of hot water discharge.

Next, the pressure actuated valve is brought into contact with the wall of the hot water channel or the water channel at the forward end in the forward direction, and the hot water channel or the water channel is closed.
For example, the pressure actuated valve is slidably fitted in the valve case in the axial direction, and the water or hot water passage hole provided in the pressure actuated valve is made to coincide with or not coincide with the water inlet or hot water inlet of the valve case. By doing so, even if the water channel or hot water channel is closed, even if the water passage port and hot water passage port of the pressure operated valve do not match the water inlet and hot water inlet of the valve case, It is inevitable that a large amount of hot water or water leaks through the fitting clearance (gap) between the pressure actuated valve and the valve case and flows into the mixing chamber.

  However, in this eighth aspect, since the pressure actuated valve is abutted in the forward direction with respect to the runner or the wall of the water channel at the forward end, and the runner or the water channel is closed, the amount of leakage of hot water and water is reduced. It can be reduced as much as possible.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is an automatic temperature control type hot and cold water mixing valve of the present embodiment, 12 and 14 are water inlets and hot water inlets provided in the valve casing 16 so as to be axially separated, and 18 and 20 are these. A water channel and a water channel following the water inlet 12 and the hot water inlet 14.
Water and hot water that flow into the interior through the water channel 18 and the hot water channel 20 are mixed in the mixing chamber 22, and the mixed water flows out from the outflow part 24 and is discharged from a predetermined water discharge part.

26 is a mixing valve having a substantially cylindrical shape, and integrally includes a water side main valve 28 on the left side and a hot water side main valve 30 on the right side in the drawing.
The water-side main valve 28 is closed in contact with the water-side main valve seat 36 formed in the valve casing 16 in the axial direction, and in the closed state, the water channel 18 is closed to allow water to flow into the mixing chamber 22. Stop.
Further, the valve is opened away from the water side main valve seat 36 in the right direction in the figure, and water is allowed to flow into the mixing chamber 22 through the water channel 18 in the opened state.
Further, the inflow amount of water into the mixing chamber 22 is changed according to the valve opening amount.

On the other hand, the hot water main valve 30 on the right side in the drawing is closed in contact with the corresponding hot water main valve seat 38 formed in the valve casing 16 in the axial direction (right direction in the drawing). Then, the hot water channel 20 is closed and the inflow of hot water from the hot water channel 20 to the mixing chamber 22 is stopped.
Further, the valve is opened away from the hot water side main valve seat 38 in the left direction in the figure, and hot water flows into the mixing chamber 22 through the hot water channel 20.
Further, the amount of hot water flowing into the mixing chamber 22 is changed according to the valve opening amount.
However, the mixing valve 26 changes the valve opening degree of the water-side main valve 28 and the hot water-side main valve 30 in a reverse relationship, and changes the water inflow amount and the hot water inflow amount into the mixing chamber 22 to change the mixed water. Change the temperature.

The mixing valve 26 is integrally formed with ring-shaped guide portions 32 and 34 at the left end and the right end in the drawing, and the guide portions 32 and 34 guide the forward and backward movement of the mixing valve 26 in the horizontal direction in the drawing. It has come to be.
The guide portions 32 and 34 also serve as spring receivers, and the biasing force of the temperature-sensitive spring 40 made of a shape memory alloy coil spring disposed inside the mixing chamber 22 with respect to the left guide portion 32 in the drawing. Is extending to the right in the figure.

On the other hand, the biasing force of the bias spring 44 made of a normal metal coil spring disposed in the spring chamber 42 is opposite to the biasing force of the temperature-sensitive spring 40 in the rightmost guide portion 34 in the figure. It extends to the left.
That is, the mixing valve 26 is energized in the direction of opening the water-side main valve 28 and closing the hot water-side main valve 30 by the temperature-sensitive spring 40, and closing the water-side main valve 28 by the bias spring 44. It is energized in the direction of opening.
Therefore, the mixing valve 26 is held at a position where the rightward biasing force in the figure by the temperature-sensitive spring 40 and the leftward biasing force in the figure by the bias spring 44 are balanced.

Reference numeral 46 denotes an axial passage formed inside the mixing valve 26, and reference numeral 48 denotes an O-ring held at the outer peripheral surface of the mixing valve 26 and at the axial center position.
The mixing valve 26 is brought into watertight contact with an inner peripheral surface of a later-described pressure operating valve 52 in the O-ring 48.

Reference numeral 50 denotes a screw shaft portion (rotating shaft portion) for setting or changing the temperature, and the bias spring 44 is interposed between the screw shaft portion 50 and the mixing valve 26.
Therefore, when the screw shaft portion 50 is screwed in the left direction in the figure, the bias spring 44 is compressed and the urging force in the left direction in the figure is increased.
As a result, the balance position of the rightward biasing force in the figure by the temperature-sensitive spring 40 and the leftward biasing force in the figure by the bias spring 44 changes, and the mixing valve 26 has the biasing force of the temperature-sensitive spring 40 and the bias spring 44. The position is moved to the left in the drawing to a position where the urging force is balanced.
Conversely, when the screw shaft portion 50 is moved in the right direction in the drawing, the bias spring 44 extends in the axial direction to weaken the biasing force, and as a result, the mixing valve 26 causes the biasing force of the temperature-sensitive spring 40 and the bias spring 44 to move. It is moved rightward in the figure to a position where the urging force is balanced.

In this hot / cold water mixing valve 10, the temperature of the mixed water 26 is set or changed by operating the screw shaft portion 50, so that the mixing valve 26 is positioned at the position corresponding to the set temperature, that is, the temperature-sensitive spring 40 is attached to the right. The position is moved to a position where the force and the leftward biasing force by the bias spring 44 are balanced.
In this state, when the temperature of the mixed water of water and hot water flowing in from the water channel 18 and the hot water channel 20 rises with respect to the set temperature, the urging force of the temperature sensing spring 40 increases and the position of the mixing valve 26 is on the right side in the figure. Slightly moved.

As a result, the valve opening of the water-side main valve 28 is large and the valve opening of the hot-water main valve 30 is small, increasing the inflow of water while decreasing the inflow of hot water. Is automatically adjusted to the set temperature.
Conversely, when the temperature of the mixed water is lower than the set temperature, the temperature sensing spring 40 contracts to weaken the urging force, whereby the mixing valve 26 closes the water side main valve 28 and opens the hot water side main valve 30. The amount of water inflow is decreased, the amount of hot water inflow is increased, the temperature of the mixed water is increased, and the temperature is automatically adjusted to the set temperature.

Reference numeral 52 denotes a pressure operating valve that is separate from the mixing valve 26. The pressure operating valve 52 has a cylindrical shape as a whole, and is externally fitted to the mixing valve 26 so as to be slidable in the axial direction.
This pressure-actuated valve 52 has an annular projecting portion 54 projecting radially in the outer peripheral surface and axially central portion, and an O-ring 56 is held therein, and the projecting portion 54 is connected to the above-described projecting portion 54. A portion between the water channel 18 and the hot water channel 20 is fitted into the inner peripheral surface of the valve casing 16 through an O-ring 56 so as to be watertight and slidable in the axial direction.

  This pressure-actuated valve 52 functions to close the water passage 20 when the water is cut off and close the water passage 18 when the water is cut off. A water-side valve portion 58 projecting radially outwardly in the left end portion in the figure, Similarly, a hot water side valve portion 60 projecting radially outwardly in a ring shape is integrally provided at the right end in the drawing, and the outer peripheral ends of the water side valve portion 58 and the hot water side valve portion 60 are provided in the valve casing 16. The corresponding water side valve seat (wall of the water channel 18) 62 and the hot water side valve seat (wall of the water channel 20) 64 are made to face each other in the axial direction.

In this embodiment, the flow of water in the water channel 18 is throttled at a portion between the water side valve portion 58 and the water side valve seat 62, and then downstream of the water side valve portion 58 and upstream of the mixing valve 26, It flows into a water chamber 66 that forms part of the water channel 18.
Further, the hot water flow in the hot water passage 20 is squeezed at a portion between the hot water side valve portion 60 and the hot water side valve seat 64, and is further downstream of the hot water side valve portion 60 and upstream of the mixing valve 26. It flows into the hot water chamber 68 that forms part of the passage 20.

The pressure operating valve 52 normally works to balance the pressure on the water side supplied to the mixing valve 26 and the pressure on the hot water side, but works to close the hot water passage 20 when the water is shut off. Sometimes it works to close the waterway 18.
In detail, since only hot water flows into the mixing chamber 22 when the water is cut off, the temperature-sensitive spring 40 increases the biasing force in response to the rise in the temperature of the mixed water, and moves the mixing valve 26 to the right in the figure. Try to close the hot water main valve 30.

However, the temperature sensitive spring 40 does not generate a force sufficient to close the hot water main valve 30, and therefore, as shown in FIG. 2A, the hot water main valve 30, the hot water main valve seat 38, A minute gap is generated between the two and hot water leaks from there.
At this time, however, the hot water chamber 68 is in a state of pressure, and the pressure in the hot water chamber 68 acts to press the pressure operating valve 52 leftward in the figure.

On the other hand, the water pressure has disappeared due to the water cut off on the side of the water channel 18, and as a result, the pressure operating valve 52 is pushed leftward in the figure by the pressure difference between the hot water pressure and the water pressure, as shown in FIG. Then, the hot water side valve portion 60 hits the hot water side valve seat 64 and closes the hot water passage 20, where the supply of hot water to the mixing valve 26 is substantially stopped.
However, since no sealing member is provided between the hot water side valve portion 60 and the hot water side valve seat 64, there is a very small gap between the hot water side valve portion 60 and the hot water side valve seat 64. The pressure from the primary side of the hot water channel 20 is guided into the hot water chamber 68 through the gap.

In this state, the squeezing pressure in the hot water chamber 68 decreases, so that the resistance force when the hot water main valve 30 is closed disappears or becomes small as shown in FIG. The hot water side main valve 30 can be brought into contact with the hot water side main valve seat 38 by the urging force of, and the hot water channel 20 can be closed.
That is, the hot water passage 20 can be closed twice by both the pressure operating valve 52 and the mixing valve 26.

The above is the operation when the pressure operating valve 52 closes the hot water passage 20 when water is cut off. At the time of hot water cutting, the pressure operating valve 52 closes the water passage 18 according to the same principle as described above, and the water to the mixing chamber 22 is discharged. The inflow is substantially stopped.
That is, the hot / cold water mixing valve 10 of this embodiment stops water discharge both when the water is cut off and when the hot water is cut off.

  As described above, in the hot / cold water mixing valve 10 of the present embodiment, when water breakage occurs while the temperature of the mixed water is adjusted to an appropriate temperature, the pressure in the water channel 18 disappears on the upstream side of the mixing valve 26. Based on the pressure difference between the water pressure on the upstream side of the valve 26 and the hot water pressure, the pressure operating valve 52 operates in a direction to close the hot water passage 20, and effectively allows hot water to leak into the mixing chamber 22 through the hot water passage 20. Can be prevented.

Alternatively, when a hot water break occurs under a condition where the temperature of the mixed water is adjusted to an appropriate temperature, the hot water pressure disappears on the upstream side of the mixing valve 26, so that the pressure operating valve 52 closes the high-pressure side water passage 18. It operates and can effectively prevent water (cold water) from leaking into the mixing chamber 22 through the water channel 18.
That is, in the hot / cold water mixing valve 10 of the present embodiment, when the water breakage occurs or when the water breakage occurs, water discharge can be substantially stopped by the action of the pressure operation valve 52.

  Therefore, it is not particularly necessary to increase the size of the temperature sensing spring 40 in order to close the water channel 20 or the water channel 18 when water or hot water is cut off. Problems such as a problem, an increase in the size of the hot / cold water mixing valve 10, or a heavy operating load can also be avoided.

In this embodiment, the pressure operating valve 52 is brought into contact with the hot water side valve seat 64 or the water side valve seat 62 in the forward direction at the forward end, and the hot water passage 20 or the water passage 18 is closed. The amount of leakage of hot water and water when the hot water channel 20 or the water channel 18 is closed can be reduced as much as possible.
In this embodiment, only one of the water side valve portion 58 and the hot water side valve portion 60 can be provided in the pressure operation valve 52 (in FIG. 3, only the hot water side valve portion 60 is provided. It is also possible to provide a pressure-actuated valve 52 in the mixing valve 26.

4 to 8 show other embodiments of the present invention.
As shown in FIG. 4, in this embodiment, the water side main valve 28 and the hot water side main valve 30 in the mixing valve 26 are provided separately and separately movable.
The water-side main valve 28 is provided with an annular throttle portion 70 protruding toward the water chamber 66 that forms a part of the water channel 18, and the flow of the water channel 18 is throttled by the throttle portion 70. Yes.
The water-side main valve 28 is closed when the throttle portion 70 contacts the water-side main valve seat 36.
On the other hand, the hot water main valve 30 is also provided with an annular throttle portion 72 that protrudes toward the water chamber 68 that forms a part of the hot water passage 20, so that the flow of the hot water channel 20 is restricted by the throttle portion 72. It has become.
The hot water main valve 30 is closed when the throttle portion 72 contacts the hot water main valve seat 38.

A water side back pressure chamber 76 is formed behind the right side of the water side main valve 28 in the figure.
The water-side back pressure chamber 76 communicates with the water channel 18 through the introduction small hole 112, and water in the water channel 18 is introduced into the water-side back pressure chamber 76 through the introduction small hole 112.
The water-side back pressure chamber 76 introduces pressure on the primary side of the water channel 18 (primary side with respect to the mixing valve 26), and pressurizes the internal pressure against the water-side main valve 28 in the valve closing direction. To act as.

On the other hand, the hot water side main valve 30 is formed with a hot water side back pressure chamber 78 behind the left side in the drawing.
The hot water side back pressure chamber 78 communicates with the hot water channel 20 through the introduction small hole 114, and the hot water of the hot water channel 20 is introduced therein.
The hot water side back pressure chamber 78 introduces the primary pressure in the hot water channel 20 and causes the internal pressure to act on the hot water main valve 30 as a pressing force in the valve closing direction.

The water-side back pressure chamber 76 includes a radially outer first chamber 76-1 and a radially inner second chamber 76-2 formed between the valve casing 16 and a wall portion 74 that is integrally formed. And they communicate with each other in a communication passage 80.
The hot water side back pressure chamber 78 also includes a radially outer first chamber 78-1 formed between the hot water side pressure chamber 78 and the wall portion 74, and a radially inner second chamber 78-2. The communication paths 80 communicate with each other.

As shown in FIG. 5, the water side main valve 28 and the hot water side main valve 30 have a configuration in which an inner cylinder 82 and an outer cylinder 84 are connected by a bridge portion 86, and these inner cylinder 82 and outer A plurality of passages 46 penetrating in the axial direction are formed between the tube 84 and the bridge portion 86.
The communication passage 80 is formed so as to penetrate the bridge portion 86 in the radial direction.

Reference numeral 88 denotes a shaft body provided at the center of the mixing valve 26. The shaft body 88 has large-diameter flange portions 90 and 92 at both axial ends, and the left-side flange portion 90 in the drawing. On the other hand, the biasing force of the temperature-sensitive spring 40 in the mixing chamber 22 is exerted to the right.
Further, the biasing force of the bias spring 44 in the spring chamber 42 is applied to the right flange portion 92 in the drawing in the right direction in the drawing.

The shaft body 88 is integrally formed with a large-diameter portion 94 at the central portion in the axial direction, and a flange portion 96 is provided on both sides thereof, and an annular shape is provided between the large-diameter portion 94 and the flange portion 96. A groove is formed in which a seal ring 98 is held.
The shaft body 88 passes through the mixing valve 26 in the axial direction as shown in FIG. 4, and the shaft body 88 is connected to the mixing valve 26 via the seal ring 98, that is, the water-side main valve 28. And the hot water side main valve 30 is fitted in a watertight manner so as to be slidable in the axial direction.

A flange-shaped water-side pilot valve 100 is integrally formed at the left side of the large-diameter portion 94 of the shaft body 88 in the figure, and a flange-like water-side pilot valve 102 is also formed at the right-side position in the figure. It is constructed integrally.
The water side pilot valve 100 is connected to the water side pilot valve seat 104 formed in the water side main valve 28, and the hot water side pilot valve 102 is connected to the hot water side pilot valve seat 106 formed in the hot water side main valve 30. On the other hand, they are opposed to each other in the axial direction with a predetermined minute tracking gap in the axial direction.

A water-side pilot passage 108 is formed at the center of the water-side main valve 28 as a pressure relief passage that penetrates the water-side main valve 28 in the axial direction.
The water-side pilot passage 108 reduces the pressure of the water-side back pressure chamber 76 by drawing water from the water-side back pressure chamber 76 downstream.
On the other hand, the hot water side main valve 30 is also formed with a hot water side pilot passage 110 as a pressure release passage that penetrates the main valve 30 in the axial direction.
Similarly, the hot water side pilot passage 110 also draws water (hot water) from the hot water side back pressure chamber 78 to the downstream side to reduce the pressure in the hot water side back pressure chamber 78.

In this embodiment, the water side main valve 28 and the hot water side main valve 30 in the mixing valve 26 move forward and backward in the same direction following the movement of the water side pilot valve 100 and the hot water side pilot valve 102, respectively.
The operation is as follows.
4 and 6 (I) show that the water side pilot valve 100 and the hot water side pilot valve 102 are both opened, and therefore the water side main valve 28 and the hot water side main valve 30 are also opened. is there.
From this state, as shown in FIG. 6 (II), when the water side pilot valve 100 moves backward in the right direction in the figure, the opening degree of the water side pilot passage 108 temporarily increases, and the water side The amount of water that flows from the pressure chamber 76 to the downstream side increases, and the pressure in the water-side back pressure chamber 76 decreases.
Then, due to the pressure balance with the water pressure on the water channel 18 side, the water main valve 28 moves backward in the right direction in the figure as shown in FIG. 7 (III), and the water side back pressure chamber 76 and the water channel 18 side are moved. The movement of the water side main valve 28 stops at a position where the pressure is balanced.

  At this time, the gap between the water-side pilot valve 100 and the water-side pilot valve seat 104 becomes a constant minute follow-up gap, and thereafter, the water-side main valve 28 follows the backward movement of the water-side pilot valve 100, While maintaining the minute follow-up clearance, the water-side pilot valve 100 moves backward in the same direction in conjunction with the backward movement. As a result, the valve opening of the water-side main valve 28 increases, and the flow rate of water flowing into the mixing chamber 22 from the water channel 18 increases.

Similarly, the hot water main valve 30 follows the backward movement of the hot water pilot valve 102 in the left direction in the figure, and has a constant minute follow-up between the hot water pilot valve 102 and the hot water pilot valve seat 106. It moves backward in the same direction as the hot water pilot valve 102 while maintaining the gap.
The valve opening is increased by the backward movement of the hot water main valve 30 in the left direction in the figure, and the amount of hot water flowing from the hot water passage 20 into the mixing chamber 22 is increased.

However, the water side pilot valve 100 and the hot water side pilot valve 102 are formed integrally with the shaft body 88, and the valve opening degree is changed in a reverse relationship with each other. Following this, the opening degree of the valve is changed in a reverse relationship.
As a result, the amount of water inflow and the amount of hot water inflow are changed in a reverse relationship, and the temperature of the mixed water is changed accordingly.

  In this embodiment, when the screw shaft portion 50 is moved in the left-right direction in the drawing by screw feed, the positions of the shaft body 88, that is, the water-side pilot valve 100 and the hot water-side pilot valve 102 are changed according to this. It moves to a position where the biasing force with the bias spring 44 is balanced, and the water-side main valve 28 and the hot water-side main valve 30 correspond to the set temperature of the mixed water by operating the screw shaft portion 50 accordingly. Adjusted to position.

  In this state, when the temperature of the mixed water of the water and the hot water flowing in through the water channel 18 and the hot water channel 20 changes with respect to the set temperature, the urging force in the right direction in the figure by the temperature sensing spring 40 changes, and the water side pilot valve 100, the hot water side pilot valve 102 is slightly moved in the left-right direction in the figure, and the water side main valve 28 and the hot water side main valve 30 follow the water side pilot valve 100 and the hot water side pilot valve 102 following this. Then, by moving forward and backward in the same direction and changing the position, the ratio of the water inflow amount and the hot water inflow amount is changed, and the mixed water temperature is automatically adjusted to the set temperature.

In this embodiment, a cylindrically-actuated pressure operating valve 52 is fitted on the circular outer peripheral surface of the wall 74 so as to be slidable in the left-right direction in the drawing.
Therefore, also in this embodiment, when water breakage occurs in a state in which the temperature of the mixed water is adjusted to an appropriate temperature, the pressure operation valve 52 operates to close the runner 20 as in the embodiment of FIG. .
That is, as shown in FIG. 8, the pressure operating valve 52 moves to the left in the figure, and the hot water side valve portion 60 comes into contact with the hot water side valve seat 64, thereby closing the hot water passage 20 and the hot water passage 20. Then, the hot water is stopped from flowing into the mixing chamber 22.
When the hot water is cut off, the pressure operating valve 52 moves rightward in the figure, the water side valve portion 58 is brought into contact with the water side valve seat 62, the water channel 18 is closed, and the water to the mixing chamber 22 is closed. Stop inflow.

9 to 12 show another embodiment of the present invention.
As shown in FIG. 9, in this embodiment, the mixing valve 26 is configured as a diaphragm valve.
Specifically, the mixing valve 26 has a rubber diaphragm film 116 and a hard resin main body 118, and the inner peripheral end of the diaphragm film 116 is fixed to the main body 118. The outer peripheral end portion of the diaphragm film 116 is fixed to the valve casing 16, and the mixing valve 26 moves forward and backward in the left-right direction in the drawing with the flexible deformation of the diaphragm film 116.

  In this embodiment, the water-side main valve 28 and the hot water-side main valve 30 are formed integrally with the main body 118, and the water-side main valve 28 is connected to the water-side main valve seat 36 formed in the valve casing 16. The hot water side main valve 30 comes into contact with a hot water side main valve seat 38 formed in the valve casing 16 and closes.

In this embodiment, the mixing valve 26 is a water pressure driven valve, and a water side back pressure chamber 76 is provided at the right side position of the water side main valve 28 in the figure.
As shown in an enlarged view in FIG. 11, the water-side back pressure chamber 76 communicates with the water channel 18 through a small communication hole 120 and a water inflow opening 122 formed in the valve casing 16. Water on the upstream side of the mixing valve 26 is introduced into the inside through the hole 120 and the water inflow opening 122.
The water-side back pressure chamber 76 increases the pressure by introducing water into the inside, and causes the pressure inside the water-side back pressure chamber 76 to act as a pressing force in the direction in which the water-side main valve 28 is closed with respect to the mixing valve 26.
The mixing valve 26 is moved back and forth in the left-right direction in the drawing by a balance between the left-side pressing force of the water-side back pressure chamber 76 in the drawing and the right-side pressing force by the pressure of the water supplied through the water channel 18.
In addition, the mixing valve 26, in detail, the main body 118 is formed with a passage 46 penetrating in the axial direction.

In FIG. 9, 124 is a shaft that penetrates through the central portion of the mixing valve 26. As shown in detail in FIG. 10, sleeves 126-1, 126-2, 126-3, and 126- 4 is externally fitted so as to be slidable in the axial direction.
The left sleeves 126-2 and 126-3 in the drawing are provided with large-diameter flange portions 128 and 130, and a temperature-sensitive spring 40 is interposed between the flange portions 128 and 130. The urging force of the temperature-sensitive spring 40 is applied to the sleeves 126-2 and 126-1 in the right direction in the figure.

The sleeve 126-1 includes a large-diameter portion 132 and a fitting portion 134 having a smaller diameter at the left side position in the drawing, and the flange portion at the right end of the large-diameter portion 132 and the sleeve 126-4 in the drawing. A bias spring 44 is interposed between the bias spring 136 and the device 136. The biasing force of the bias spring 44 is applied to the sleeve 126-1 and the sleeve 126-2 leftward in the drawing, that is, in the direction opposite to the biasing direction by the temperature sensitive spring 40.
The shaft body 124 is provided with a retaining ring 138, and the retaining ring 138 defines the position of the left end of the sleeve 126-3 in the drawing and the position of the right end of the sleeve 126-4 in the drawing.
A seal ring 98 is held on the sleeve 126-1, and a fitting portion 134 is fitted to the inner peripheral surface of the mixing valve 26 so as to be slidable in the axial direction under the seal by the seal ring 98. ing.

A water side pilot valve 100 is also integrally formed with the sleeve 126-1. This water-side pilot valve 100 communicates with the water-side pilot passage 108 formed at the center of the mixing valve 26, that is, the water-side back pressure chamber 76, as in the embodiment shown in FIGS. The pilot passage 108 to be performed is moved back and forth in the direction of changing the opening (left and right in the figure), and the mixing valve 26 is moved forward and backward in the same direction following this.
However, also in this embodiment, the water-side pilot valve 100 follows and moves the mixing valve 26 forward and backward while maintaining a constant minute follow-up gap with the water-side pilot valve seat 104.

Specifically, when the water side pilot valve 100 moves backward in the right direction in the figure, the mixing valve 26 is maintained while maintaining a constant minute follow-up gap between the water side pilot valve 100 and the water side pilot valve seat 104. Following the rightward direction in the figure, the valve moves backward by the same distance to increase the valve opening of the water-side main valve 28 and to decrease the valve opening of the hot water-side main valve 30.
Conversely, when the water side pilot valve 100 moves forward in the left direction in the figure, the mixing valve 26 moves forward by the same distance in the left direction in the figure and the valve opening of the water side main valve 28 decreases. In addition, the opening degree of the hot water main valve 30 is increased.
The forward / backward movement of the mixing valve 26 is performed using the feed water pressure supplied through the water channel 18 as a driving force.

  As shown in FIG. 10, the sleeve 126-1 having the water side pilot valve 100, the temperature sensitive spring 40 interposed between the sleeves 126-2 and 126-3, the sleeve 126-1 and the sleeve 126 are provided. -4, the bias spring 44 interposed between each sleeve portion and the shaft body 124 together with each sleeve portion constitutes a pilot valve unit 140 that integrally moves in the axial direction, that is, in the horizontal direction in the figure. .

  Therefore, in this embodiment, when the water side pilot valve 100 is moved forward in the left direction in the figure, it is not necessary to bend the bias spring 44 and the temperature sensitive spring 40. Therefore, when the water side pilot valve 100 is moved forward, The water-side pilot valve 100 can be moved forward with a small operating force without receiving deformation resistance due to the bias spring 44 and the temperature-sensitive spring 40.

As shown in FIG. 9, in this embodiment, a cylindrical portion 142 is integrally formed with the rotary shaft portion 141.
A female screw portion 144 is provided on the inner peripheral surface of the cylindrical portion 142, and the male screw portion on the outer peripheral surface of the first advancing / retracting member 146 having a cylindrical shape provided inside the cylindrical portion 142 with respect to the female screw portion 144. 148 is screwed together.

  An engagement groove 150 extending in the axial direction is formed on the inner peripheral surface of the first advance / retreat member 146, and an axial engagement protrusion 152 formed in the valve casing 16 is formed in the engagement groove 150. Are engaged, and the first advancing / retracting member 146 is restricted in rotation with respect to the valve casing 16 by their engaging action.

Accordingly, when the rotary shaft portion 141 is rotated, the cylindrical portion 142 formed integrally therewith rotates, so that the first advance / retreat member 146 advances and retreats in the left-right direction in the drawing by screw feeding by the female screw portion 144 and the male screw portion 148. It can be moved.
The rotating shaft portion 141 is provided with a male serration portion 154 on the outer peripheral surface, and the rotating shaft portion 141 is connected to a handle (not shown) in the male serration portion 154 in an integrally rotated state. Yes.

A second advancing / retreating member 156 having a bottomed cylindrical shape is provided further inside the first advancing / retreating member 146, and the second advancing / retreating member 156 is disposed between them with respect to the first advancing / retreating member 146. It is connected to the state which moves integrally in the axial direction via the interposed buffer spring 158.
The connecting shaft portion 160 protruding from the shaft body 124 through the valve casing 16 is connected to the second advancing / retracting member 156 so as to integrally move in the axial direction.
Here, the space between the connecting shaft portion 160 extending through the valve casing 16 and the valve casing 16 is sealed watertight by an O-ring 56.
The buffer spring 158 functions to absorb the excessive operation force (by bending the temperature-sensitive spring 158) when an excessive operation force is applied via the rotary shaft portion 141.

In this embodiment, when the rotary shaft portion 141 is rotated, the first advancing / retracting member 146 screwed into the cylindrical portion 142 formed integrally with the rotary shaft portion 141 moves forward / backward in the horizontal direction in the drawing by screw feed. Further, along with this, the second advance / retreat member 156 inside thereof moves forward and backward in the left-right direction in the drawing together with the first advance / retreat member 146.
Then, by the advance / retreat movement of the second advance / retreat member 156, the shaft body 124 connected thereto, that is, the pilot valve unit 140 shown in FIG. 10 moves forward and backward integrally in the left-right direction in the figure, and the water-side pilot valve 100 opens. Moves in the direction to increase or decrease the degree.
That is, the position of the mixing valve 26 can be adjusted by rotating the rotary shaft portion 141, and the temperature of the mixed water can be set to a desired temperature and the setting can be changed.

As shown in FIG. 9, in this embodiment, on the upstream side and the hot water side of the mixing valve 26, a pressure operating valve 162 that operates in a direction to close the hot water channel 20 when water is shut off is provided.
The pressure actuated valve 162 has a cylindrical shape as shown in FIG. 11, and is slidable axially on the inner peripheral surface of the valve casing 16 through the seal ring 98 on the outer peripheral surface, that is, in the horizontal direction in the figure. It is fitted inside.
The pressure operating valve 162 is integrally formed with a rising portion 164 that rises radially outward.
On the left side of the rising portion 164 in the figure, a forward side pressure receiving surface 166 that receives pressure in the forward direction in the direction of closing the runner 20 is formed, and on the right side in the figure, reverse side that receives pressure in the reverse direction that is the reverse direction. A side pressure receiving surface 168 is formed.

Correspondingly, a water-side primary pressure chamber 170 communicating with the primary side of the water supply (of the water channel 18) is provided on the right side of the rising portion 164 in the drawing, and the pressure in the hot water channel 20 is provided on the left side of the drawing. A hot water side secondary pressure chamber 172 communicating with the secondary side of the operating valve 162 is provided.
Then, the pressure in the water-side primary pressure chamber 170 is exerted on the rising portion 164, that is, in the backward direction (leftward in the figure) with respect to the pressure operating valve 162, and the pressure in the hot water-side secondary pressure chamber 172 rises. It is applied to the part 164, that is, to the pressure actuated valve 162 in the forward direction (right direction in the figure).

The hot water side secondary pressure chamber 172 is the primary side with respect to the mixing valve 26, specifically, the hot water side main valve 30. It should be called a pressure chamber.
The pressure actuated valve 162 is in a state in which the hot water side valve portion 174 at the front end protrudes toward the hot water passage 20 side, and the flow of hot water in the hot water passage 20 is throttled by the hot water side valve portion 174. Yes.
The hot water side valve portion 174 of the pressure actuated valve 162 is opposed to the hot water side valve seat 176 in the axial direction, that is, the forward and backward direction, and the pressure actuated valve 162 is opposed to the hot water side valve seat 176 at the forward end. It abuts in the forward direction and closes the runway 20.

  In this embodiment, the pressure on the secondary side of the pressure operating valve 162 in the hot water passage 20 is reduced by the throttle action of the hot water side valve portion 174 of the pressure operating valve 162, and the pressure is reduced. The hot water pressure acts on the hot water main valve 30 in the mixing valve 26.

In this embodiment, the primary pressure of the feed water is guided to the water-side primary pressure chamber 170. On the other hand, the hot water pressure after the pressure drop after the hot water flow is throttled by the hot water valve portion 174 is introduced into the hot water secondary pressure chamber 172.
Therefore, normally, the force that pushes the pressure operating valve 162 in the left direction in the drawing, that is, the backward direction by the water side primary pressure chamber 170, and the pressure operating valve 162 that pushes the pressure operation valve 162 in the right direction, that is, the forward direction in the drawing by the hot water side secondary pressure chamber 172. Therefore, the pressure actuated valve 162 is normally located in a state of being retracted in the left direction in the figure.

In this state, even if the hot water supply pressure fluctuates slightly high, the pressure on the left side of the figure by the water primary pressure chamber 170 is still superior, so the pressure operating valve 162 increases the hot water supply pressure. Even if it fluctuates, the runner 20 is not immediately closed by that.
Therefore, even if the pressure operating valve 162 that closes only the hot water passage 20 is provided, the temperature adjustment function is not particularly impaired by fluctuations in the hot water supply pressure on the hot water side.

On the other hand, if water suddenly stops in a state where the temperature adjustment operation is performed, the pressure in the water-side primary pressure chamber 170 disappears. At this time, the pressure in the hot water-side secondary pressure chamber 172 is overcome. As shown in FIG. 12, the pressure actuated valve 162 moves forward in the right direction in the figure, and at its forward end, the hot water side valve portion 174 contacts the hot water side valve seat 176, where the hot water channel 20 is closed. It becomes a state.
However, also in this embodiment, an elastic seal portion is not provided between the hot water side valve portion 174 and the hot water side valve seat 176, and the hot water side valve portion 174 is closed when the hot water side valve portion 174 is closed. A very small gap is generated between the portion 174 and the hot water side valve seat 176.

In this embodiment, even when the temperature is set to discharge only cold water, the pressure operation valve 162 works to close the hot water passage 20.
In FIG. 9, when the rotary shaft 141 is rotated and the mixing valve 26 is moved so that the water-side main valve 28 is opened in front and the hot water-side main valve 30 is fully closed, that is, only cold water is discharged. When the secondary side downstream of the mixing valve 26 in the water channel 18 is substantially open to the atmosphere, the pressure on the primary side upstream of the mixing valve 26 greatly decreases, and is driven by water pressure. In the mixing valve 26, since the driving force due to the water pressure is insufficient, the hot water passage 20 cannot be sufficiently closed by the hot water main valve 30.

In this case, hot water from the hot water channel 20 leaks and flows into the mixing chamber 22.
At this time, the pressure in the water-side primary pressure chamber 170 on the right side of the rising portion 164 of the pressure actuated valve 162 in FIG. 11 also drops significantly, so that the pressure in the hot water-side secondary pressure chamber 172 is overcome here. Thus, the pressure actuated valve 162 moves forward in the right direction in the drawing and closes, and as shown in FIG. 12, the hot water channel 20 is closed.
Therefore, in spite of the setting of water discharge only for cold water, it is possible to satisfactorily solve the problem that hot water leaks from the hot water passage 20 and enters the mixing chamber 22, that is, into the water discharge.

The above is an example in which the mixing valve 26 is configured as a water pressure driven valve and the pressure operating valve 162 that closes only the hot water channel 20 is provided on the hot water side. However, in the present invention, the mixing valve 26 is replaced with a hot water pressure driven valve. None, and it is also possible to provide a pressure-actuated valve that operates to close only the water channel 18 on the water side.
13 and 14 show specific examples thereof.
In the example of FIGS. 13 and 14, the water side and the hot water side are in an inverse relationship with respect to the embodiment shown in FIGS. 9 to 12. This is the same as that shown in FIG.

Specifically, in this example, a hot water side back pressure chamber 78 is provided on the left side of the hot water main valve 30 integrally formed with the mixing valve 26 in the figure, and the hot water side back pressure chamber 78 is connected to the communication small hole 178. The hot water inflow opening 180 communicates with the hot water passage 20 so that the hot water primary pressure is introduced into the hot water side back pressure chamber 78.
The mixing valve 26 moves back and forth in the left-right direction in the figure so as to balance the rightward pressing force in the figure due to the pressure in the hot water-side back pressure chamber 78 and the hot water supply pressure introduced through the hot water passage 20.

The pilot valve unit 140 is provided with a hot water side pilot valve 102, and a hot water side pilot passage 110 is provided at the center of the mixing valve 26 correspondingly.
A pressure operating valve 182 that operates so as to close only the water passage 18 is provided on the upstream side and the water side of the mixing valve 26.
Similar to the above-described embodiment, the water pressure valve 182 is also provided with a water side valve portion 184, and the water side valve portion 184 contacts the water side valve seat 186 in the forward direction.

The pressure actuating valve 182 is provided with a rising portion 164, and the right side surface of the rising portion 164 in the drawing is a forward pressure receiving surface 166, and the left side surface is a backward pressure receiving surface 168.
A hot water side primary pressure chamber 188 is provided on the left side of the rising portion 164, and a water side secondary pressure chamber 190 for introducing the pressure on the secondary side of the pressure operating valve 182 in the water channel 18 is provided on the right side. ing.

In this embodiment, when the hot water side primary pressure chamber disappears when the hot water is cut off, the pressure operating valve 182 has a pressure difference between the hot water side primary pressure chamber 188 and the water side secondary pressure chamber 190 in the left side of the figure. The water side valve portion 184 is brought into contact with the water side valve seat 186 so as to close the water channel 18.
When the temperature is set to discharge only hot water, the hot water side is fully opened, and the primary pressure drops greatly. At that time, the pressure operating valve 182 moves forward in the left direction in the figure and closes the water channel 18. Even though the hot water only is set to be discharged, the problem that water from the water channel 18 is mixed into the discharged water can be solved.

  Although the embodiments of the present invention have been described in detail above, these are merely examples. For example, in the above embodiment, the pressure operating valve is provided coaxially with the mixing valve and in the hot water mixing valve. However, the pressure operating valve may not be arranged coaxially with the mixing valve, and the present invention does not depart from the spirit thereof. It can be configured with various modifications.

It is a figure of the hot and cold water mixing valve which is one embodiment of the present invention. It is operation | movement explanatory drawing of the embodiment. It is a figure of the principal part of other embodiment of this invention. It is a figure of the hot and cold water mixing valve of another embodiment of the present invention. It is a single item figure of the water side main valve (hot water side main valve) of the embodiment. It is operation | movement explanatory drawing of the embodiment. FIG. 7 is an operation explanatory diagram following FIG. 6. FIG. 8 is an operation explanatory diagram different from FIGS. 6 and 7. It is a figure of the hot and cold water mixing valve of still another embodiment of the present invention. FIG. 10 is a diagram of the pilot valve unit in FIG. 9. It is a principal part enlarged view of FIG. It is operation | movement explanatory drawing of the embodiment. It is a figure of the principal part of the hot water mixing valve of other embodiment of this invention. It is the elements on larger scale of FIG. It is a figure which shows an example of the conventional hot water mixing valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water mixing valve 26 Mixing valve 28 Water side main valve 30 Hot water side main valve 40 Temperature sensing spring 44 Bias spring 52,162,182 Pressure actuating valve 76 Water side back pressure chamber 78 Hot water side back pressure chamber 100 Water side pilot valve 102 Hot water side pilot valve 104 Water side pilot valve seat 106 Hot water side pilot valve seat 108 Water side pilot passage 110 Hot water side pilot passage 112, 114 Introduction small hole 166 Forward side pressure receiving surface 168 Backward side pressure receiving surface 170 Water side primary pressure chamber 172 Hot water side secondary pressure chamber 188 Hot water side primary pressure chamber 190 Water side secondary pressure chamber

Claims (8)

(A) a mixing valve having a water-side main valve and a hot water-side main valve, and changing the mixing ratio of the hot water by changing the valve openings of the water-side main valve and the hot water-side main valve in reverse relation to each other (B) a temperature sensitive spring made of a shape memory alloy that increases the biasing force in the direction of opening the water side main valve and closing the hot water side main valve in response to an increase in the temperature of the mixed water, and moves the position of the mixing valve And (c) a bias spring that applies a biasing force in a direction opposite to the temperature sensing spring in a direction to move the mixing valve in a direction to close the water side main valve and open the hot water side main valve. In the automatic temperature control type hot and cold water mixing valve provided, the pressure difference between the water pressure and the hot water pressure upstream of the mixing valve is formed separately from the mixing valve on the upstream side of the mixing valve. Automatic pressure control characterized by providing a pressure operating valve that operates in the direction of closing the high-pressure side hot water channel or water channel based on Type hot water mixing valve.   2. The automatic temperature control type according to claim 1, wherein the pressure-actuated valve is a valve that operates in a direction to selectively close one of the hot water channel and the water channel on the high-pressure side. Hot water mixing valve.   2. The automatic temperature control according to claim 1, wherein the pressure-actuated valve is a valve that operates in a direction in which only one of the hot water channel or the water channel is closed when the one is on a high-pressure side. Type hot water mixing valve. 4. The pressure actuated valve according to claim 3, wherein the pressure actuated valve is a valve that operates in a direction to close only the runner side, and the pressure actuated valve receives pressure in a forward direction in a direction to close the runner. A forward pressure receiving surface and a reverse pressure receiving surface that receives pressure in the reverse direction, which is the reverse direction, are provided,
A water side primary pressure chamber communicating with the primary side of the water channel and a hot water side secondary pressure chamber communicating with the secondary side of the pressure operating valve in the water channel are provided, and the hot water side secondary pressure chamber is provided. Pressure in the pressure chamber is applied to the forward pressure receiving surface, and pressure in the water primary pressure chamber is applied to the backward pressure receiving surface;
An automatic temperature control type hot and cold water mixing valve, wherein the pressure operating valve is operated by a pressure difference between the hot water side secondary pressure chamber and the water side primary pressure chamber. 4. The advance side according to claim 3, wherein the pressure operation valve is a valve that operates in a direction to close only the water channel side, and the pressure operation valve receives pressure in a forward direction in a direction to close the water channel. A pressure-receiving surface and a retreat-side pressure-receiving surface that receives pressure in the reverse direction that is the reverse direction;
A hot water side primary pressure chamber communicating with the primary side of the hot water channel and a water side secondary pressure chamber communicating with the secondary side of the pressure actuating valve in the water channel are provided, and the water side secondary pressure chamber is provided. The pressure in the pressure chamber is applied to the forward pressure receiving surface, and the pressure in the hot water primary pressure chamber is applied to the backward pressure receiving surface;
An automatic temperature control type hot and cold water mixing valve, wherein the pressure operating valve is operated by a pressure difference between the water side secondary pressure chamber and the hot water side primary pressure chamber. In Claim 4, the mixing valve is a valve integrally having the water side main valve and the hot water side main valve,
(a) a water-side back pressure chamber that communicates with the primary side of the water channel through an introduction small hole, and causes internal pressure to act on the mixing valve as a pressing force in a direction to close the water-side main valve;
(b) a water-side pilot passage serving as a pressure-removing passage for drawing water from the water-side back pressure chamber downstream of the water-side main valve;
(c) a water-side pilot valve that moves forward and backward in a direction to change the opening of the water-side pilot passage;
An automatic temperature control type hot and cold water mixing valve characterized in that the mixing valve is a hydraulically driven valve that moves forward and backward in the same direction following the forward and backward movement of the water-side pilot valve. . In claim 5, the mixing valve is a valve integrally having the water side main valve and the hot water side main valve,
(a) a hot water side back pressure chamber that communicates with the primary side of the hot water channel through an introduction small hole, and causes the internal pressure to act as a pressing force in a direction to close the hot water main valve on the mixing valve;
(b) a hot water side pilot passage as a pressure release passage for discharging the hot water in the hot water side back pressure chamber to the downstream side of the hot water main valve;
(c) a hot water side pilot valve that moves forward and backward in a direction to change the opening of the hot water side pilot passage;
An automatic temperature control type hot and cold water mixing, wherein the mixing valve is a hot water pressure driven valve that moves forward and backward in the same direction following the forward and backward movement of the hot water side pilot valve. valve.   The pressure actuated valve according to any one of claims 1 to 7, wherein the pressure actuated valve is abutted in a forward direction with respect to a wall of the hot water channel or the water channel at a forward end to close the hot water channel or the water channel. Automatic temperature control type hot and cold water mixing valve.

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