JPH1047506A - Directional control valve having temperature responding shift mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the safe use of a shower, in a selector valve having a valve element to selectively open and close the head of two system passages through an outside operation by connecting a shape memory element to a valve element, and closing one of two system passages through deformation responding to the temperature change toward high temperature of the shape memory element. SOLUTION: When an operation handle 3 is pulled upward to make a valve element seat in a discharge side valve seat, a shower side valve seat 5c is opened, and mixed water from a flow-in port 6b is supplied through a shower side passage 4c to a shower head, and a temperature reactive spring 9 is shrinkingly deformed by the rising of a pressure ring, and a hot water (mixed water) is discharged from the shower side, When in this state, the temperature of the mixed water is quickly risen by some reasons to high temperature, and exceeds the upper limit of the temperature used by the shower, the temperature reaction spring 9 senses the exceeded temperature and deforms to make the valve element seat from the discharge side valve seat 6g into the shower side vale seat 5c for automatically changing over the discharge from a shower head into the discharge from a discharge pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching valve for switching a flow path between a spout side and a shower head side in, for example, a hot and cold water mixing faucet. The present invention relates to a switching valve provided with a temperature-responsive switching mechanism for preventing discharge of liquid.

[0002]

2. Description of the Related Art As one example of a hot and cold water mixing faucet provided in a bathroom, there is a faucet connected by a hose in addition to a water discharge pipe for water supply / hot water supply to a bathtub. This hot / water mixing faucet is usually provided with a switching valve for switching the flow path on the water discharge pipe side and the differential shower head side in addition to the valve for adjusting the flow rate and temperature of the mixed water. A switching valve as described in JP-B-56-32679 is used.

[0003] This switching valve is a valve in which a cylindrical valve body is connected to an operating handle with a torsion spring interposed therebetween. In a normal state, the hollow portion of the valve body is connected to a flow passage on the water discharge pipe side and the shower side is connected. The flow path to is kept closed. And when switching to the shower side,
The valve body is pressed against the valve seat forming the beginning of the flow path on the water discharge pipe side by the water pressure of the mixed water flowing toward the shower side, thereby restraining the posture of the valve body so as to block the flow path to the water discharge pipe. Configuration.

With such a switching valve, when the mixed water supply is stopped after switching to the shower side and using the same,
Since the water pressure of the mixed water with respect to the valve body decreases, the valve body rotates together with the handle by the torsion spring to open the flow path to the water discharge pipe side and close the flow path to the shower side. Therefore, after using the shower, the flow path is automatically switched to the water discharge pipe side, and the next time you use it, you can avoid hot water spouting from the shower without confirming the switch at all, and It can be used safely without incurring any other factors.

[0005]

As described above, when using a hot and cold water mixing faucet, high-temperature hot water is not discharged from the shower unless the switching handle is used to switch to the shower side. It can be used particularly suitably as equipment for use.

However, if the switching handle is accidentally switched to the shower side when starting to use,
Suddenly hot water may be taken from the shower. In other words, even when hot water is discharged when using the water discharge pipe, the fingertips etc. only take a bath, but there is no problem with usability, but if water is sprayed from the shower head, the whole body will be bathed with hot water. Therefore, the risk cannot be ignored for a user who is unfamiliar with the operation.

As described above, even when the water discharge pipe is provided with the switching valve whose flow path is switched at the beginning of use, high-temperature hot water may be unexpectedly discharged when the operation is erroneous. When the temperature of the mixed water is high, it is even more preferable in terms of safety to prevent discharge even when the flow path is switched to the shower side.

The problem to be solved in the present invention is that, for example, in a hot and cold water mixing faucet provided with a valve for switching a flow path between a water discharge pipe side and a shower side, when the temperature of the mixed water exceeds the shower use temperature and becomes high, the shower The purpose is to automatically switch from the side to the spout side so that the shower can be used safely.

[0009]

SUMMARY OF THE INVENTION The present invention is incorporated between an end of a supply path of mixed water of hot water and hot water and a start of two flow paths to different supply destinations, and is operated by an external operation. A switching valve provided with a valve element for selectively opening and closing the start ends of the two flow paths, wherein a shape memory element is connected to the valve element, and a change in temperature of the shape memory element toward a high temperature side is provided. The valve body can be driven in a direction in which one of the flow paths is closed by the deformation.

[0010] Further, the end of the supply path of the mixed water of water and hot water,
A first valve body which is incorporated between the two flow paths to different supply destinations and a start end of the two flow paths to selectively open and close the start ends of the two flow paths by an external operation; A switching valve in which the upper limit of the temperature of the mixed water to the flow path of the system is set lower than the upper limit of the temperature of the mixed water to the flow path of the second system,
A shape memory element is connected to the valve body, and the valve body can be driven in a direction in which the flow path of the first system is closed by deformation according to a temperature change of the shape memory element to a high temperature side. It can be.

In this case, the shape memory element may be a temperature-responsive spring that urges the valve body in the valve closing direction using a shape memory alloy as a material, and closes the valve body in the first system flow path. It may be configured to be elastically biased in the direction.

Further, a cylindrical pilot valve body is incorporated so as to be movable between the start ends of the first and second flow passages, and between the pilot valve body and the start end of the first flow passage. Are connected by a shape memory element, and the valve element can be driven in a direction away from the start end of the flow path of the second system by deformation according to a temperature change of the shape memory element to a high temperature side, and the mixing is performed by moving a pilot valve. The communication passage with the water supply passage may be throttled.

In this case, the pilot valve body has a cylindrical shape that can be extrapolated from the flow path side of the first system, and the pilot valve body is moved by deformation of the pilot memory element in accordance with a temperature change of the shape memory element to the high temperature side. Makes it possible to shut off the end face facing the flow path side of the first system from the supply path of the mixed water, and moves the valve element on the flow path side of the first system based on the pressure difference between the flow paths of the first and second systems. Can be driven. The valve body may be a switching valve elastically biased in a direction to close the flow path of the first system, or the valve body may be a lift valve type and may be a pilot valve at the time of deformation according to a temperature change of the shape memory element to a high temperature side. When the end face facing the flow path side of the first system by the body is cut off from the supply path of the mixed water, it is configured to be movable in a direction to close the flow path side of the first system by the elastic urging force or the own weight of the valve body itself. The valve body may be exposed to the inside of the mixed water supply flow path when the valve is seated and closed at the start end of the second flow path on the side facing the second flow path. Further, a pressure receiving surface that receives the pressure of the mixed water toward the flow path side of the first system may be formed.

Further, a rotary valve element for selectively opening and closing the start ends of the two flow paths can be floated from the valve seat at the start end of the second flow path, and the mixed water from the supply path can be lifted. In the case of a switching valve that can be seated on a valve seat by water pressure, a shape memory element is connected to a valve body, and the valve body is rotated by deformation according to a temperature change of the shape memory element to a high temperature side. Thus, the valve body can be driven so that the flow path of the first system is closed.

A rotary valve body can be floated from a pair at a valve seat at the start end of the flow path of the second system, and can be seated on the valve seat by the water pressure of the mixed water from the supply path. In the premise of a switching valve elastically biased in a rotational direction away from the valve seat, the shape memory element is connected to the valve body, and the valve body is deformed according to a temperature change of the shape memory element to a high temperature side. It is possible to adopt a configuration in which levitation driving is possible from the seat.

In such a structure in which the valve body is driven to float, the valve body is provided with a protruding shaft projecting substantially from the center of rotation thereof, and a portion communicating with the first flow passage is vertically moved with respect to the valve seat. The shape memory element is a temperature responsive spring made of a shape memory alloy, and one end thereof is connected to the valve seat side and the other end is connected to the holding block, respectively. Can be.

The valve body has a tapered protruding shaft that protrudes outward from the center of rotation and tapers its tip, and has a portion communicating with the first flow path substantially coaxial with the axis of the protruding shaft. Equipped with a movable shifter, the shifter has a sleeve with an inside diameter that allows insertion and fitting of the taper of the protruding shaft, and enables the shape memory element to be biased toward the valve body as a temperature-responsive spring made of shape memory alloy. Alternatively, the tapered portion of the protruding shaft may be fitted into the opening at the distal end of the sleeve by extension deformation due to a temperature change of the temperature-responsive spring toward the high temperature side.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a valve in which a temperature-responsive spring made of a shape memory alloy is connected to a valve body as a shape memory element, mixed water exceeding the upper limit of the temperature is supplied when the first system flow path is opened. Then, the valve body operates to close the flow path side of the first system and open the flow path side of the second system by recovery of the shape of the temperature-responsive spring. Therefore, switching to the flow path side of the second system is automatically performed according to the temperature upper limit regulated on the flow path side of the first system. Further, if the valve body is elastically urged by a spring or the like that urges the valve body in the valve closing direction, the movement of the valve body at the time of switching from the first flow path to the second flow path side can be promoted, and the switching can be performed. Moves faster.

In the apparatus provided with the pilot valve element, when the mixed water having a temperature exceeding the upper limit is supplied while the valve element is opened on the first flow path side, the pilot valve element is supplied with the mixed water by the shape memory element. To reduce the internal pressure of the flow path including the valve element, the elastically urged valve element is moved in a direction to close the flow path of the first system, and the flow path side of the second system is opened to open the flow path. Is switched.

Even in the case of a rotary valve body, the shape of the valve body is restored by a temperature change to a high temperature side, and the valve body is closed so that the first system flow path side is closed and the second system flow path side is opened. With the provision of the shape memory element that rotationally drives the body, switching of the flow path at a high temperature is automatically performed.

Further, in the valve element capable of floating with respect to the valve seat on the flow path side of the second system, the shape recovery of the shape memory element at a high temperature is matched with the direction in which the valve element floats. Can separate the valve body from the valve seat,
The valve element is rotated by the elastic means urging the valve element in a rotational direction in which the second flow path opens, whereby the first flow path is switched to the second flow path.

[0022]

FIG. 1 is a schematic view showing a hot and cold water mixing faucet and a shower head provided with a switching valve according to the present invention.

The faucet main body 1 of the hot and cold mixing faucet is connected to a water supply pipe and a hot water supply pipe of a building, respectively, and is used for opening and closing a water valve and a hot water valve each having a flow path connected to these pipes. A handle 1a and a hot water handle 1b,
A discharge pipe 1c for discharging mixed water is provided. A hose 2a is connected to the faucet body 1 so as to communicate with a flow path branched from the discharge pipe 1c side.
And an operation handle 3 for switching the flow path to the discharge pipe 1c side and the shower head 2 side protrudes from the upper surface.

FIG. 2 is a longitudinal sectional view of a main part showing an assembled structure of the switching valve connected to the operation handle 3.

The switching valve includes a mixed water flow path 4a communicating with the mixing chamber downstream of the water valve and the hot water valve, a discharge flow path 4b communicating with the water discharge pipe 1c, and a shower flow communicating with the shower head 2 side. The lower housing 5 and the upper housing 6 are housed in a chamber 4d where the road 4c intersects, as shown in FIG.

The lower housing 5 is formed with a male screw 5a at the lower end thereof, which is screwed to the inlet of the shower side flow path 4c via a packing 4c-1, and a hook 6a of the upper housing 6 at the upper end. Hole 5 for engaging and integrating
The fixed seat 5b with b-1 opened is set up in four places.
As shown in FIGS. 4A and 4B, a shower-side valve seat 5c is formed inside the lower housing 5, and immediately downstream of the shower-side valve seat 5c, a valve hole is formed by a cross-shaped rib 5d. 5e is opened, and a boss 5f having an annular cross section is formed at the center of the rib 5d.

The upper housing 6 is sealed to the inner periphery of the chamber 4d via a packing 4d-1, and is connected to the lower housing 5 by inserting the hook 6a into the engaging hole 5b-1 of the fixed seat 5b. Then, the hook 6a and the fixed seat 5b are integrated in such a manner that the portions of the hooks 6a and the fixed seats 5b at which the intervals in the circumferential direction are wide open as the inflow ports 6b communicating with the mixed water flow path 4a. A sleeve 6d is integrally formed on the upper end via a rib 6c having a cross shape in a plane, and an opening between the four ribs 6c communicates the inside of the upper housing 6 with the discharge side flow path 4b. The outlet 6e is provided.

The sleeve 6d of the upper housing 6 has a length extending to the outside through a hole 1d formed in the upper surface of the faucet body 1, and the spindle 3a connected to the operation handle 3 is watertight by a packing 6d-1. It is incorporated so as to be able to move up and down. At the lower end side of the sleeve 6d, a valve body 7 which comes into contact with and separates from the valve seat 5c is held between a rib 3b formed on the spindle 3a and a retaining ring 3c to be integrally fixed.

FIG. 6 is an exploded view of the spindle 3a and the valve body 7. A pressure receiving ring 8 made of metal or synthetic resin is integrally attached to the valve body 7 made of rubber. The pressure receiving ring 8 is formed by forming an annular base 8a sealed and fixed in the valve body 7 and four legs 8b extending downward. The pressure receiving ring 8c is provided at the lower end of each of the legs 8b. Project radially.

Returning to FIG. 2, a temperature responsive spring 9 is interposed between the pressure receiving seat 8c of the pressure receiving ring 8 attached to the valve body 7 and the upper housing 6. This temperature-responsive spring 9
As shown in the figure, the lower end thereof is abutted against the pressure receiving seat 8c and is extrapolated around the four legs 8b and the valve body 7, and the upper end is located in an annular groove 6f formed on the lower surface of the upper housing 6. Plugged and held. The annular groove 6f is formed on the outer side, and the portion facing the valve body 7 is formed on the discharge side valve seat 6g.
It is formed as.

The temperature responsive spring 9 has a shape memory characteristic in which a generated load changes depending on its own temperature. Below a certain temperature, the generated load is low, and the elastic reaction force is suppressed to a small value. And the generated load increases and elongates. The temperature responsive spring 9 is set such that its characteristics transition at a temperature slightly lower than the upper limit temperature when the shower is used.

That is, within the comfortable temperature range when the shower is used, when the mixed water is not supplied and the load pressure is zero, the spindle 3a overcomes the sliding resistance with the packing 6d-1, and the lower part in FIG. The spring constant of the temperature-responsive spring 9 can be adjusted so that the valve body 8 can be moved upward by the supply pressure of the mixed water of about 5 liters / minute which is the general lower limit of the discharge amount when taking a shower. Is set as a spring constant slightly smaller than the acting force to be moved. Further, within a temperature range exceeding the comfortable temperature of the shower, when the temperature responsive spring 9 recovers to the shape stored in advance, the valve element 7 seated on the discharge side valve seat 6g is moved to the shower side valve seat 5c. Is set as a spring constant that can generate a load moving toward. The load generated at this time is a supply pressure of about 15 liters / minute, which is a general upper limit water discharge amount when taking a shower.
Is larger than the force in the direction of pushing the pressure toward the discharge side valve seat 6g.

In the above configuration, while the operating handle 3 is being pushed down as shown in FIG. 2, the valve body 8 is seated on the shower-side valve seat 5c, and the mixed water from the mixed water flow path 4a flows through the inflow port 6b. After passing through the open discharge side valve seat 5c, it flows out from the outlet 6e to the discharge side flow path 4b, and is discharged from the discharge pipe 1c.

Since the water pressure of the passing mixed water acts on the upper surface of the valve body 7, the valve body 7 is urged toward the shower-side valve seat 5c to maintain the shower-side flow path 4c closed. I do. When the temperature of the mixed water is low, the load generated by the temperature-responsive spring 9 is small, but if the operating handle 3 is pressed down, the shower-side flow path 4c can be closed using the water pressure of the mixed water as described above. it can. Further, since the load generated by the temperature responsive spring 9 increases as the temperature of the mixed water increases, the valve element 7 is moved to the shower side valve seat 5c.
, The valve closing state can be maintained more stable than when the temperature of the mixed water is low. Therefore, for example, when a small amount of high-temperature mixed water is discharged from the discharge pipe 1c, the supply pressure of the mixed water is reduced and the force for urging the valve body 7 toward the shower-side valve seat 5c is reduced. Since the load generated by the spring 9 increases, the valve body 7 is strongly pressed against the shower-side valve seat 5c, and the valve closing state can be stabilized.

On the other hand, the shower head 2
Side, the operation handle 3 as shown in FIG.
And the valve body 7 is seated on the discharge side valve seat 5g. As a result, the shower-side valve seat 5c side is opened, and the mixed water from the inflow port 6b is supplied to the shower head 2 via the shower-side flow path 4c, and the temperature-responsive spring 9 contracts and deforms due to the rise of the pressure receiving ring 8. .

Here, as described above, for the temperature of the mixed water within the comfortable temperature range of the shower, the spring constant of the temperature-responsive spring 9 is such that the mixed water received by the valve 7 at the lower limit of the shower water discharge amount. By making the acting force smaller than the pressure, the valve element 7 is maintained in the state shown in FIG. 7 by the pressure from the mixed water, and the flow path to the shower head 2 side is kept open.

Further, when the temperature of the mixed water becomes high and exceeds the upper limit of the temperature used in the shower, the load generated by the temperature responsive spring 9 increases, and the shrinkage deformation shown in FIG. The shape recovers and expands, and returns to the state of FIG. That is, when the temperature of the mixed water that has been set rises sharply for some reason and becomes high, the temperature-responsive spring 9 senses this and deforms to move the valve element 7 from the discharge-side valve seat 6g to the shower-side valve. It is possible to automatically switch the discharge from the shower head 2 to the discharge from the discharge pipe 1c by sitting on the seat 5c side.

In such a switching, when the supply amount of the mixed water is the maximum discharge amount when the shower is used, the temperature response corresponding to the mixed water temperature is not affected by the acting force due to the water pressure that the valve body 7 receives upward. If the generated load of the spring 9 is set to be superior, the flow path can be cut off by moving the valve element 7 to the shower-side valve seat 5c side regardless of the discharge flow rate when the shower is used.

As described above, if the temperature of the mixed water exceeds the upper limit temperature when the shower is used while the shower head 2 is being used while being switched to the shower head 2, the shape recovery due to the increase in the load generated by the temperature responsive spring 9 is performed. The flow path is the discharge pipe 1
Automatically switched to c-side. For this reason, even if the mixed water fluctuates to the high temperature side while using the shower, the hot water is not poured on the body, and the spindle 3a and the valve element 7 are moved by the shower head by their own weights at the start of operation. Shower head 2 with the flow path to the side 2 always closed
A switching valve that does not discharge mixed water from the valve can be used as one with further improved safety.

Further, in the above embodiment, since the temperature responsive spring 9 is arranged so as to extrapolate the valve body 7, the temperature responsive spring 9 is moved around the valve body 7 as shown in FIGS. To the inflow port 6b. For this reason, when high-temperature mixed water is supplied while switching to the shower side, the temperature-responsive spring 9
Is exposed to this high-temperature water and can be quickly actuated, whereby the discharge of the high-temperature water from the shower head 2 can be promptly shut off. In addition, the temperature responsive spring 9 can also promptly respond to a decrease in the temperature of the mixed water after the temperature adjustment on the hot / water mixing faucet side is performed again after switching to the discharge pipe 1c side, and the shower side again Switching to the operation can be performed in a very short time.

The load generated by the temperature responsive spring 9 needs to be set based on the water pressure from the mixed water received by the valve element 7, while the generated load is proportional to the wire diameter of the material of the temperature responsive spring 9. Therefore, it is preferable to use a shape memory alloy wire having a large wire diameter in order to cope with construction conditions in which the supply pressure of the mixed water is high. However, if a shape memory alloy having such a large wire diameter is used as a material, not only the cost is increased but also the flow path resistance is increased, so that the maximum discharge amount is also limited. Therefore, in order to eliminate such a disadvantageous condition, if the supply pressure of the mixed water is kept low by incorporating an appropriate pressure reducing valve in the mixed water flow path 4a or on the upstream side thereof, the line of the temperature-responsive spring 9 can be reduced. The diameter can be reduced, and there is no problem in terms of cost and maximum discharge amount.

FIG. 8 is another example, which is shown in FIGS.
In the switching valve shown in (1), an auxiliary spring 10 is disposed between the lower surface of the upper housing 6 and the retaining ring 3c.

The auxiliary spring 10 is a general compression coil spring using a steel wire, and its spring constant is such that the combined spring constant when arranged in parallel with the temperature-responsive spring 9 is the lower limit of discharge when the shower is used. The acting force of the valve body 7 being pushed in the direction of the discharge side valve seat 6d by the water pressure from the mixed water corresponding to the amount is made smaller.

In FIG. 8, when the operating handle 3 is pulled up, the valve body 7 is seated on the discharge-side valve seat 6d, the flow path on the shower side is opened, and the state shown in FIG. I have. When the temperature of the mixed water exceeds the upper limit when the shower is used, the load generated by the temperature responsive spring 9 increases, and the valve body 7 is pushed toward the shower side valve seat 5c. At this time, when the valve element 7 separates from the discharge-side valve seat 6g, the pressure of the mixed water is also applied to the upper surface side of the valve element 7, and the initial pressure difference between the upper and lower surfaces of the valve element 7 cancels out and balances. It changes to a state. Accordingly, the valve element 7 receives the urging force of the auxiliary compression spring 10 and recovers its shape due to the load generated by the temperature responsive spring 9 and moves the valve element 7 toward the shower side valve seat 5c at a stretch.

By providing the auxiliary spring 10 in this manner, the movement of the valve body 7 toward the shower-side valve seat 5c when the mixed water changes to a high temperature can be made faster as compared with the previous example, The discharge of high-temperature water from the shower head 2 can be stopped immediately. Therefore, it is possible to push the mixed water of the appropriate temperature stored in the hose 2a downstream from the shower-side valve seat 5c from the shower head 2 so that the user is not exposed to the high-temperature water at all. Will be done.

FIG. 9 shows an example of a pilot valve type switching valve which can be suitably used for equipment having a high supply pressure of mixed water. A switching valve is incorporated in a chamber 4d which communicates with the provided mixed water flow path 4a, discharge side flow path 4b and shower side flow path 4c.

The example of FIG. 9 differs from the previous example in that the lower housing 5 and the upper housing 6 are coaxially screwed together and are not provided with the hook 6a or the fixing seat 5b. As shown in the perspective view of FIG. 5, the inflow port 6b communicating with the mixed water flow path 4a is different from the previous example in that the inlet 6b has a larger shape than the previous example and is open to the peripheral wall. The other housing configurations are almost the same as those in the previous example, and the same members are indicated by common reference numerals.

A pilot valve element 11 that can move up and down by sliding on the inner peripheral surface thereof is incorporated in the upper housing 6. As shown in FIG. 11, the pilot valve element 11 has a cylindrical valve ring 11a and four spacers 1 provided at the upper end thereof.
An annular stopper 11c is formed at the tip of 1b. A temperature responsive spring 12 is incorporated between the valve ring 11a and the upper surface of the lower housing 5,
Between the upper surface of the valve ring 11a and the lower surface of the upper housing 6, a compression bias spring 13 made of a normal steel wire is used.
Intervene.

Further, a rib 3d is formed at a portion deviated to the lower end side of the spindle 3a, and a valve element 14 is attached so as to cover the upper and lower surfaces thereof. And the valve element 14
As in the example of FIG. 8, a compression auxiliary spring 15 is interposed between the upper housing 6 and the upper housing 6 to urge the valve body 14 toward the shower-side valve seat 5c.

In FIG. 9, the valve element 14 is seated on the shower-side valve seat 5c and the flow path to the discharge pipe 1c is opened. At this time, the valve body 15 is restrained to the valve closing position by the water pressure of the mixed water, and the pilot valve body 11 is
As shown in the drawing, the temperature-responsive spring 12 is contracted by receiving the water pressure on the upper surface of the bias spring 1.
3 and the auxiliary spring 15 are both extended to separate the valve body 14 and the pilot valve body 11 respectively into the shower side valve seat 5c.
Biased to the side.

If the temperature of the mixed water is lower than the lower limit of the temperature suitable for the shower, the load generated by the temperature responsive spring 12 does not change, so that the pilot valve body 11 remains stopped at the position shown in FIG. The discharge of the mixed water from the discharge port 1c is continued.

On the other hand, when the operation handle 3 is pulled up as shown in FIG. 12 to discharge from the shower head 2, the valve element 14 is seated on the discharge side valve seat 6g. Then, by setting the spring constant of the auxiliary spring 15 to be smaller than the acting force due to the water pressure of the mixed water as described in FIG. 8, the valve element 14 can be held at the position of FIG.
The supply of the mixed water to the shower head 2 is continued.

When the temperature of the mixed water rises above the upper limit temperature of the shower while the mixed water is being discharged from the shower head 2, the load generated on the temperature-responsive spring 12 increases, and Recover. Therefore, the biasing force of the temperature responsive spring 12 is superior to the bias spring 13, and the pilot valve body 11 is raised from the position shown in FIG. As the pilot valve element 11 rises, the valve ring 11a gradually narrows the opening area of the inflow port 6b of the upper housing 6, and finally the upper end of the stopper 11c is moved to the lower surface of the upper housing 6 as shown in FIG. Stops when hitting.

The valve ring 11 of such a pilot valve body 11
Due to the restriction of the inflow port 6b by a, the inflow of the mixed water into the pilot valve body 11 itself decreases. Then, the pilot valve element 11 has been raised to the position shown in FIG.
The surrounding water pressure also drops. Therefore, at a stage where the urging force of the auxiliary spring 15 has exceeded the hydraulic pressure for lifting the valve element 14 upward, the valve element 14 is pushed toward the shower-side valve seat 5c and discharged as shown in FIG. At the same time as opening the side valve seat 6g, the shower side valve seat 5c is closed and the flow path is switched to the discharge pipe 1c side.

In the case where the pilot valve element 11 is provided, when the temperature of the mixed water becomes high when the flow path is connected to the shower head 2 side, the temperature responsive spring 12 extends and the pilot valve element 11 It is only necessary to reduce the pressure around the valve body 14 by increasing the pressure. For this reason, compared with the example in which the valve element 7 is directly moved by the temperature-responsive spring 9 as in the examples shown in FIGS. , And the operation of stopping the discharge from the shower head 2 can be performed more quickly.

In the case of the pilot valve element 11, the pressure drop of the mixed water flowing into the pilot valve element 11 is used to make use of the valve element 1.
4 is moved toward the shower-side valve seat 5c, so that the load on the valve body 14 does not fluctuate significantly even when the supply pressure of the mixed water is high. Therefore, the operation of the valve element 14 and the spindle 3a to which the valve element 14 is attached can be stabilized, and, for example, seating failure of the valve element 14 on the shower-side valve seat 5c at the time of occurrence of high temperature is prevented, and reliable operation is ensured. Water can be stopped.

In each of the above examples, the lift valves are used to move the valve bodies 3 and 14 by moving the operation handle 3 up and down. However, the rotary valves shown in FIGS. Can be automatically switched to the discharge pipe side. This will be described below.

FIG. 14 is a left side vertical sectional view of the hot and cold water mixing faucet, showing a state where the flow path is switched to the discharge pipe side.
FIG. 15 is a vertical cross-sectional view of the left side of the main part when switched to the shower side, and FIG. 16 is a vertical cross-sectional view taken along line AA of FIG.

The water faucet main body 21 of the hot and cold water mixing faucet has a water valve and a hot water valve disposed on the right and left sides, respectively, as viewed from the front side, as in the example shown in FIG. By operating these water valves and hot water valves (not shown), water and hot water are mixed in the mixing chamber 21b formed downstream of these valves. A switching valve chamber 21c is formed downstream of the mixing chamber 21b, and a discharge pipe 21d is provided at the lower end thereof.
And a shower head (not shown) hose 22 on the back
Are connected to each other.

A rotary operation handle 23 for switching a flow path, which is disposed in front of the faucet body 21, is provided with a torsion spring 23 between the bush 21f fixed to the faucet body 21.
are connected through a. Then, by the urging force of the torsion spring 23a, it is possible to maintain a state in which the switching valve is normally switched to the discharge pipe 21d side as described later.

A spindle 23b is connected to the operation handle 23 as shown in FIG.
1c and the valve body 24 is connected. As shown in FIG. 16, the valve body 24 has a cylindrical shape in which a pressure receiving surface 24a having a part of a peripheral surface formed into a flat surface is formed, and a valve hole 24b having an opening axis orthogonal to the axis of the spindle 23b is formed. It is a thing. Then, as shown in FIG.
4 has a projecting shaft 24c at the left end and a connecting shaft 24d at the right end for connecting to the spindle 23b.

The protruding shaft 24c is loosely inserted into a support hole 21g formed as a part of the inner wall of the switching valve chamber 21c.
An annular gap is formed between the outer peripheral surface of the protruding shaft 24c and the inner peripheral surface of the support hole 21g. Also,
At the tip of the spindle 23b, a holding hole 23c having an inner diameter larger than the outer diameter of the connecting shaft 24d is opened in the axial direction so that the connecting shaft 24d can be loosely inserted. Further, a pin 23d is provided in the support hole 23c in a direction orthogonal to the axis of the spring 23b, and the pin 23d is inserted into a connection hole 24e formed in the connection shaft 24d.
4d and the spindle 23b are connected. And pin 2
By making the inner diameter of the connecting hole 24e larger than the outer diameter of 3d, the connecting shaft 24d has a certain degree of freedom with respect to the pin 23d.

Due to the connection between the protruding shaft 24c and the support hole 21g and the connection between the connection shaft 24d and the spindle 23b, the valve body 24 is positioned relative to the support hole 21g and the spindle 23b whose positions are fixed. At 14, play can be provided in the left and right direction and in the up and down direction, as well as in a direction in which these are combined, and the valve element 24 can freely swing around in a certain range.

Further, the temperature responsive spring 25 extends from the inside of the switching valve chamber 21c to the entrance to the joint 21e.
Incorporate. The temperature responsive spring 25 is a coil spring like the torsion spring 23a, and has its left end connected and fixed to the inner wall of the switching valve chamber 21c and its right end connected to the valve body 24 in FIG. At the time of shape recovery due to a load generated when exposed to a high temperature, the coil of the temperature responsive spring 25 is rotated in a clockwise direction so that the valve body 14 switched to the shower side water discharge shown in FIG. And the connecting point to the valve element 24 are set.

In order to prevent the valve body 24 from rotating any more when the valve body 24 is rotated 90 degrees clockwise from the posture shown in FIG. 16 to the posture shown in FIG. 14 as shown in FIG. And the bush 21f is provided with a stopper 21f-1.

In the above configuration, the valve 24 is set at the position shown in FIG. 14 when the water is stopped and when the discharge is completed, and the flow path is switched to the discharge pipe 21d side. In this state, when the temperature of the mixed water is low, no load is generated on the temperature-responsive spring 25, so that the valve body 2
16, there is no acting force to rotate clockwise in FIG. 16, and the valve body 24 is held in the illustrated posture.

Further, when the temperature of the mixed water becomes high and the load generated by the temperature responsive spring 25 causes the valve body 24 to move as shown in FIG.
In the posture of the valve body 24 shown in FIG. 14, the projection 23b-1 of the spindle 23b does not
Engages with the stopper 21f-1 of the bush 21f and does not rotate any more, so that the mixed water is discharged from the discharge pipe 21d while the valve body 24 is maintained in the state of FIG.

When switching the flow path to the shower side,
In FIG. 16, the operation handle 23 is turned so that the valve body 24 rotates counterclockwise. Thereby, the valve element 2
4 has the posture of FIGS. 15 and 16, and the pressure receiving surface 24a faces the mixing chamber 21b. And the valve element 24
Are arranged with play in the switching valve chamber 21c as described above.
In response to the pressure of the mixed water flowing through the valve c, the outer peripheral surface of the valve body 24 is seated on a valve seat 21c-1 formed on the inner wall of the switching valve chamber 21c as shown in FIG. Therefore, the flow path to the discharge pipe 21d side is closed, and the flow path is switched to the shower side.

When the temperature of the mixed water exceeds the upper limit temperature of the shower when switching to the shower side and using, the load generated by the temperature responsive spring 25 causes the valve body 24 to rotate.
Is rotated clockwise in FIG. As a result, as shown in FIG. 14, the valve hole 24b communicates with the discharge pipe 21d, and the mixed water is guided to the discharge pipe 21d by aligning the valve hole 24b immediately below the outlet of the mixing chamber 21b. Supply is stopped.

It should be noted that the temperature-responsive spring 25 is
Is rotated in the same direction as the restoration direction of the torsion of the torsion spring 23a on the operation handle 23 side, and the valve body 24 is quickly rotated with the restoration of the torsion spring 23a.

FIG. 17 shows the case where the torsion spring 2 is used when a high-temperature mixed water is supplied when it is used on the shower side.
By rotating the operation handle 23 using the twisting by 3a, the flow path is switched from the shower side to the discharge pipe 21d side.

The joint 21 is located inside the switching valve chamber 21c.
In the position facing e, as shown in the enlarged view of the main part of FIG.
A pair of hollow guides 26 and 27 are arranged vertically, and a holding block 28 for loosely inserting and holding the protruding shaft 24c of the valve body 24 is connected to these guides 26 and 27 so as to be vertically movable. The holding block 28 has guides 2 above and below it.
Pins 28a which are slidably inserted into the hollow portions 6 and 27,
28b.

A coil-shaped bias spring 29 using a steel wire is incorporated between the upper guide 26 and the holding block 28, and similarly, between the lower guide 27 and the holding block 28. A coiled temperature responsive spring 30 is provided. This temperature-responsive spring 30 has a transition characteristic in which it shrinks as shown in FIG. 18 below the upper limit of the temperature of the mixed water when using the shower, and recovers its shape by twisting to the generated load and expands when it exceeds the upper limit. .

Also in this example, when the valve is switched to the shower side, the valve body 24 is held in the posture shown in FIG.
The outer peripheral surface of the valve body 24 is seated on the valve seat 21c-1 and the discharge pipe 2
The flow path on the 1d side is closed. When the temperature of the mixed water exceeds the upper limit temperature when the shower is used, the temperature-responsive spring 28b extends in FIG. 18 to lift the holding block 28. Therefore, the outer peripheral surface of the valve body 24 and the valve seat 21c-1 are released from seating, and resistance to rotation of the valve body 24 does not act.
When the torsion spring 23a, which biases the valve body 24 via the spindle 23b from the posture of FIG. 4 to the posture of FIG. Return to

As described above, when the temperature of the mixed water rises while the shower is being used, the temperature-responsive spring 3
By setting the valve element 24 to a state in which it is easy to rotate according to 0 and utilizing the restoration by the torsion spring 23a, the switching of the flow path from the shower side to the discharge pipe 21c side is automatically performed.

FIG. 19 is an enlarged vertical cross-sectional view of a main part showing still another example. In this case, when the flow path of the valve body 24 is switched from the shower side to the discharge pipe 1c side, the valve body 24 is moved by a temperature-responsive spring. The configuration is such that the resistance to the rotation of the motor is released.

At the outlet from the switching valve chamber 21c to the joint 21e, a shifter 31 movable in the left-right direction in the figure is incorporated, and the protruding shaft 24c of the valve element 24 has a tapered tip facing the shifter 31. Tapered 2
4c-1 is formed. The shifter 31 is larger than the outer diameter of the tip of the taper 24c-1 of the protruding shaft 24c and
Sleeve 31 smaller than outer diameter of base end side of 4c-1
a on one end side, a downstream side of the sleeve 31a is made large in diameter, and a flange 31b is formed on the outer periphery thereof. A flow path hole 31c for forming a flow path to the shower side is opened in the peripheral wall of the sleeve 31a. ing. The flange 31b is sandwiched between a bias spring 32 using a steel wire and a temperature responsive spring 33, and the temperature responsive spring 33 recovers its shape by high-temperature mixed water and extends.

The other structure is exactly the same as that shown in FIGS. 14 to 17, and at the time of normal use and when the shower is finished, as shown in FIG.
The posture is switched to the 1d side. And
When switching to the shower side, as shown in FIGS. 15 and 16, the valve element 24 rotates 90 degrees from the state in FIG. 19 to close the flow path on the discharge pipe 21d side.

If the temperature of the mixed water exceeds the upper limit when the temperature is switched to the shower side, the temperature-responsive spring 33 recovers its shape and expands, and moves the shifter 31 to the right in FIG. By this movement, the taper 24c-1 of the protruding shaft 24c enters the sleeve 31a, and the shape of the taper 24c-1 described above and the sleeve 31c
Due to the relationship with the inner diameter of a, the protruding shaft 24c is
a.

Here, the axis of the protruding shaft 24 c when the valve body 24 is in the posture switched to the shower side is the sleeve 31.
In this case, the outer peripheral surface of the valve body 24 is set to a position slightly lower than the axis of the valve seat 21 as shown in FIG.
c-1 so as to close the flow path to the discharge pipe 21d side. On the other hand, since the height position of the sleeve 31a is fixed, as the shifter 31 moves rightward in FIG. 19 and the taper 24c-1 fits into the sleeve 31a, the taper 24c-1 The valve body 24 moves upward due to the inclination, and its peripheral surface is disengaged from the valve seat 21c-1, and resistance to rotation of the valve body 24 does not act similarly to the examples of FIGS. Thus, the restoring force of the torsion spring 23a rotates the valve body 24 to the posture shown in FIG. 19, and switches the flow path from the shower side to the discharge pipe 21d side.

FIGS. 20 and 21 are longitudinal sectional views of a main part showing another embodiment having a spool valve type pilot valve.

This example has the same system as the pilot valve already described with reference to FIGS. 9 to 13, and those having the same functions are designated by the same reference numerals as those in the previous example, and detailed description thereof will be made. Is omitted.

As in the previous example, a hollow cylindrical spool valve element 41 is incorporated between the upper and lower housings 5 and 6. Similar to the pilot valve element 11 shown in FIG. 11, the spool valve element 41 has a valve ring 41a and a flange 41b provided on the outer peripheral surface thereof. And an annular stopper 41c is formed at the upper end.

The structure of the flow path for this spool valve element 41 is exactly the same as that of the previous example, and is housed in a chamber 4d branched from the mixed water flow path 4a to the discharge side and shower side flow paths 4b, 4c. A spool valve element 41 is extrapolated around a valve element 14 provided on the lower end side of the spindle 3a. A temperature-responsive spring 42 is incorporated between the lower surface of the flange 41b and the lower housing 5, and a bias spring 43 is disposed between the upper surface of the flange 41b and the upper housing 6.

In the example having such a spool valve element 41, the water discharge and the switching operation are exactly the same as in the previous example.
When the operation handle 3 is pulled to switch to the shower side as shown in FIG. 1, the upper surface of the valve body 14 is pressed against the discharge-side valve seat 6g because the surface on which the water pressure is applied to the valve body 14 is larger on the lower surface. Maintain spitting water.

When the temperature of the mixed water becomes high in this state, as shown in FIG. 22, the temperature responsive spring 42 is extended and the lower end of the valve body 14 is covered with the spool valve body 41 so that no water pressure is applied. As for the water pressure of the mixed water, the valve element 14 protrudes toward the mixed water flow path side from the discharge-side valve seat 6g, so that the water pressure is applied only to the conical pressure receiving surface 14a, and the valve element 14 is pushed down by this water pressure. Therefore, if the valve element 14 separates from the discharge-side valve seat 6g after this pressing down, water pressure is applied to the entire upper surface of the valve element 14, so that FIG.
As shown at 0, the valve element 14 is pressed against the shower side valve seat 5c to stop water discharge from the shower side, and switches to water discharge from the spout side.

As described above, in the examples shown in FIGS. 20 to 22, the auxiliary water spring for urging the valve body 14 toward the shower side valve seat 5c is not provided, but the temperature of the mixed water becomes high when the shower is used. By utilizing the pressure difference between the upper and lower surfaces of the valve element 14 due to the movement of the spool valve element 41 at the time, the flow path on the shower side can be quickly closed.

FIG. 23 is a longitudinal sectional view showing an example in which a spool valve type pilot valve is further provided, showing only the upper and lower housings and the internal main mechanism.

In this example, the upper housing 51 having substantially the same shape as that shown in FIGS. 9 to 13 and FIGS.
And a lower housing 52. The peripheral wall at the boundary between the upper and lower housings 51, 52 is opened to communicate with the mixed water flow path. The upper housing 51 has a valve seat 5.
1a, the downstream side of which is communicated with the spout side, and the valve body 53 which can be moved up and down by an operation handle is connected to the valve seat 5.
1a so that it can be seated. This valve element 53 is a valve seat 51.
a is provided on the upper surface side and a disk-shaped packing 53b is provided on the lower surface. After the shower is used between the upper housing 51 and the valve body 53, the valve body 53 is lowered to discharge the water to the water discharge pipe. The automatic return spring 54 for switching to is mounted.

On the other hand, a cylindrical valve seat 55 whose inside communicates with a flow path on the shower side is incorporated in the lower housing 52, and a spool valve body 56 is arranged around the valve seat 55.
A temperature responsive spring 57 for urging the spool valve body 56 toward the valve body 53 on the upper housing 51 side is installed on the inner peripheral side of the spool valve body 56, and on the outer peripheral side of the spool valve body 56. A bias spool 58 for urging the spool valve body 56 downward is provided.

In the state shown in FIG. 22, the valve body 53 is raised, and the packing 53a on the upper surface thereof is seated on the valve seat 51a to close the flow path to the water discharge pipe side. The flow path on the valve seat 55 side is open and connected to the shower side. Here, when the temperature of the mixed water rises, FIG.
And the temperature-responsive spring 5 as in the examples of FIGS.
7, the spool valve element 56 closes the flow path around the lower part of the valve element 53, thereby lowering the internal pressure on the lower side in the figure. Then, the flow path is switched from the shower side to the water discharge pipe side.

[0092]

According to the present invention, when the mixed water exceeding the temperature upper limit is supplied when the valve body is opened on the discharge side where the temperature upper limit is regulated, the shape memory element connected to the valve body is opened. By utilizing shape recovery, the valve element can be operated so as to close the first discharge side and open the other discharge side. For this reason, if the present invention is applied to switching between a discharge pipe side where a high-temperature mixed water is discharged, such as a hot-water mixing faucet and the like, which does not cause a great problem, and a shower side where it is desired to avoid discharging the high-temperature mixed water, a shower is provided. If the temperature of the mixed water rises during use, the flow path can be immediately switched to the discharge pipe side, so that it can be used even more safely.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a hot and cold water mixing faucet provided with a switching valve of the present invention together with a shower head.

FIG. 2 is a longitudinal sectional view showing a main part of a switching valve provided in the hot and cold water mixing faucet of FIG.

FIG. 3 is an exploded view of an upper housing and a lower housing of a switching valve.

FIG. 4 shows details of a lower housing, and FIG.
Is a longitudinal sectional view, and (b) of the same figure is a bottom view.

FIG. 5 is a longitudinal sectional view of the upper housing.

FIG. 6 is an exploded view of a spindle, a valve body, and a pressure receiving ring.

7 is a longitudinal sectional view when the switching valve of FIG. 2 is switched to a shower side.

FIG. 8 is a longitudinal sectional view showing an example of a switching valve provided with an auxiliary spring.

FIG. 9 is a longitudinal sectional view showing an example of a switching valve provided with a pilot valve element.

10 is a perspective view schematically showing an upper housing of a switching valve in FIG. 9;

11A and 11B are details of the pilot valve element, in which FIG. 11A is a longitudinal sectional view, and FIG. 11B is a schematic perspective view.

FIG. 12 is a longitudinal sectional view when the switching valve of FIG. 9 is switched to a shower side.

FIG. 13 is a vertical cross-sectional view when the pilot valve body is raised by high-temperature mixed water during shower discharge.

FIG. 14 is a left side longitudinal sectional view of a hot and cold water mixing faucet provided with a switching valve by a temperature responsive spring for rotating a valve body.

FIG. 15 is a left side longitudinal sectional view of a main part of the hot and cold water mixing faucet of FIG. 14 when switched to a shower side.

16 is a longitudinal sectional view taken along line AA of FIG.

FIG. 17 is a longitudinal sectional view of a hot and cold water mixing faucet showing an example of a mechanism for eliminating resistance to rotation of a valve body when switching from a shower side to a discharge pipe side.

18 is a longitudinal sectional view showing a main part of the switching mechanism of FIG.

FIG. 19 is a longitudinal sectional view of a main part showing an example in which a mechanism for eliminating resistance to rotation of the valve element by a shifter is used.

FIG. 20 is a longitudinal sectional view of an essential part when a spool valve element is incorporated as a pilot valve and a flow path to a water discharge pipe side is open.

FIG. 21 is a longitudinal sectional view of a main part when the flow path is switched to the shower side in the example of FIG.

FIG. 22 is a longitudinal sectional view of a main part showing movement of a spool valve body when the temperature of mixed water becomes high when a shower is used in the example of FIG. 20;

FIG. 23 is a longitudinal sectional view of a main part showing an example in which a hollow cylindrical valve seat is provided in a flow path on the shower side and a spool valve body is provided around the valve seat as a pilot valve.

[Explanation of symbols]

 1: faucet body 1c: discharge pipe 2: shower head 2a: hose 3: operating handle 3a: spindle 4a: mixed water flow path 4b: discharge side flow path 4c: shower side flow path 4d: chamber 5: lower housing 5c: shower Side valve seat 6: Upper housing 6g: Discharge side valve seat 7: Valve body 8: Pressure receiving ring 8b: Leg 8c: Pressure receiving seat 9: Temperature-responsive spring 10: Auxiliary spring 11: Pilot valve body 11a: Valve ring 11b: Spacer 11c : Stopper 12: Temperature-responsive spring 13: Bias spring 14: Valve 14 a: Pressure receiving surface 15: Auxiliary spring 21: Water faucet main body 21 b: Mixing chamber 21 c: Switching valve chamber 21 c-1: Valve seat 21 d: Discharge pipe 21 g: Support Hole 22: Hose 23: Operation handle 23a: Torsion spring 23b: Spindle 2 c: holding hole 23d: pin 24: valve body 24a: pressure receiving surface 24b: valve hole 24c: protruding shaft 24c-1: taper 24d: connecting shaft 24e: connecting hole 25: temperature-responsive spring 26: guide 27: guide 28: holding Block 28a: Pin 28b: Pin 29: Bias spring 30: Temperature-responsive spring 31: Shifter 31a: Sleeve 31b: Flange 31c: Flow path hole 32: Bias spring 33: Temperature-responsive spring

Claims (14)

[Claims] 1. A method according to claim 1, wherein the mixed water of hot water and hot water is installed between an end of a supply path of the mixed water and a start of two flow paths to different destinations.
A switching valve provided with a valve element for selectively opening and closing the start ends of the two channels by an operation from the outside, wherein a shape memory element is connected to the valve element and a high-temperature side of the shape memory element is connected. A switching valve provided with a temperature-responsive switching mechanism capable of driving the valve body in a direction in which one of the flow paths is closed by a deformation according to a temperature change of the switching element. 2. A water supply system comprising a mixed water and hot water supply line, which is installed between an end of the supply passage and a start of two flow paths to different supply destinations,
A lift valve type valve element that selectively opens and closes the starting ends of the two flow paths by an external operation, and sets the upper limit of the temperature of the mixed water to the first flow path to the second flow path A switching valve set at a temperature lower than the upper limit of the temperature of the mixed water, wherein a shape memory element is connected to the valve body, and the first shape memory element is deformed in accordance with a temperature change to a high temperature side.
A switching valve having a temperature-responsive switching mechanism capable of driving the valve body in a direction in which the flow path of the system is closed. 3. The switching valve according to claim 2, wherein the shape memory element is a temperature-responsive spring made of a shape-memory alloy as a material and biases the valve body in a valve closing direction. 4. A switching valve provided with a temperature-responsive switching mechanism according to claim 2, wherein said valve element is elastically urged in a direction to close the flow path of said first system. 5. A system which is incorporated between an end of a supply path of a mixed water of water and hot water and a start of two flow paths to different supply destinations,
A valve body for selectively opening and closing the start ends of the two flow paths by an external operation, and setting a temperature upper limit of the mixed water flow to the first flow path to the mixed water flow to the second flow path. A switching valve set lower than the upper limit of the temperature, wherein a tubular pilot valve body is incorporated so as to be movable between the start ends of the first and second flow paths, and the pilot valve body and the The shape memory element is connected to the beginning of the flow path of the first system by a shape memory element, and the shape memory element is separated from the start end of the flow path of the second system by deformation according to a temperature change to a high temperature side. A switching valve including a temperature-responsive switching mechanism that enables the valve body to be driven and restricts the communication flow path with the mixed water supply path by moving the pilot valve. 6. A pilot valve body having a cylindrical shape that can be extrapolated from the flow path side of the first system, and the pilot valve body is moved by deformation of the pilot valve body during deformation according to a temperature change of the shape memory element to a high temperature side. An end face of the valve element facing the flow path side of the first system can be shut off from the supply path of the mixed water, and the valve element is connected to the first system based on a pressure difference between the flow paths of the first and second systems. A switching valve provided with the temperature responsive valve according to claim 5, which can be driven to the side of the flow path. 7. A switching valve provided with a temperature responsive valve according to claim 5, wherein the valve body is a switching valve elastically biased in a direction to close the flow path of the first system. 8. The valve body is of a lift valve type, and the end face of the pilot valve body facing the flow path of the first system by the pilot valve body when deformed according to a temperature change to a high temperature side is a supply path of mixed water. The switching valve provided with a temperature responsive valve according to claim 5, wherein when shut off from the valve, the valve body can move in a direction to close the flow path side of the first system by its own weight. 9. An end face on a side where the valve element faces the flow path of the second system is provided in the supply flow path of the mixed water when the valve body is closed by being seated at the start end of the flow path of the second system. 9. A switching valve provided with a temperature responsive valve according to claim 8, wherein a pressure receiving surface is formed to receive the pressure of the mixed water toward the flow path side of the first system. 10. A two-system flow path which is incorporated between an end of a supply path of mixed water of hot water and hot water and a start end of two flow paths to different supply destinations, and which is started by an external operation. A rotary valve body that selectively opens and closes the liquid mixture, and sets the temperature upper limit of the mixed water to the flow path of the first system lower than the temperature upper limit of the mixed water to the flow path of the second system, A switching valve capable of floating the valve body from a valve seat at the start end of the flow path of the second system and seating the valve body on the valve seat by the water pressure of mixed water from the supply path, A shape memory element is connected to a body, and the valve body is rotated by a deformation corresponding to a temperature change of the shape memory element to a high temperature side, so that the valve body is rotated in a direction in which the flow path of the first system is closed. A switching valve equipped with a temperature-responsive switching mechanism that can drive the valve. 11. A starting end of the two-system flow path which is incorporated between the end of the supply path of the mixed water of hot water and hot water and the beginning of the two-system flow path to a different supply destination, and which is externally operated. And a rotary valve element for selectively opening and closing the mixed water, setting the upper limit of the temperature of the mixed water to the flow path of the first system lower than the upper limit of the temperature of the mixed water to the flow path of the second system, The valve body is floatable from a pair at a valve seat at the start end of the flow path of the second system, and can be seated on the valve seat by the water pressure of the mixed water from the supply path. A switching valve elastically biased in a rotational direction away from a valve seat, wherein a shape memory element is connected to the valve body, and the valve body is deformed according to a temperature change to a high temperature side of the shape memory element. A switching valve equipped with a temperature-responsive switching mechanism that enables levitation drive from the valve seat. 12. The valve body has a protruding shaft protruding outward from a center of rotation of the valve body, and is movable up and down with respect to the valve seat at a portion communicating with the first flow path. 12. The temperature according to claim 11, wherein a holding block having a shaft loosely fitted therein is provided, and the shape memory element is a temperature-responsive spring made of a shape memory alloy, one end of which is connected to the valve seat and the other end thereof is connected to the holding block. Switching valve with a response switching mechanism. 13. The valve body is provided with a tapered protruding shaft that protrudes outward from the center of rotation and tapers its tip, and a portion communicating with the first flow path is substantially coaxial with the axis of the protruding shaft. A shifter movable coaxially, the shifter includes a sleeve having an inner diameter capable of inserting and fitting the taper of the protruding shaft, and the shape memory element is a temperature-responsive spring made of a shape memory alloy, and the shifter is 12. The temperature responsive switching according to claim 11, wherein the temperature responsive spring can be biased toward the valve body side, and the tapered portion of the protruding shaft can be fitted to the distal end opening of the sleeve by extension deformation due to a temperature change of the temperature responsive spring toward a high temperature side. Switching valve with a mechanism. 14. The temperature responsive valve according to claim 1, wherein the flow path of the first system is a flow path on the shower head side, and the flow path of the second system is a flow path on the water discharge pipe side. Switching valve provided.