JPH0894184A - Hot-water discharging instrument for bathtub - Google Patents

Abstract

PURPOSE: To improve the reliability of operation of a hot-water pouring valve, provided in a hot-water discharging instrument for a bathtub, by a method wherein the opening degree of a flow-rate regulating valve is reduced when the detecting temperature of a flow-rate regulating valve driving unit has become higher than a predetermined temperature while an opening and closing valve closes a hot-water supplying passage when the detecting temperature of an opening and closing valve driving unit has become higher than the predetermined temperature. CONSTITUTION: A shape memory spring (flow rate regulating valve driving unit) 14, formed of a shape memory material such as a shape memory alloy or the like, is received in a spring receiving area 13 in the hot-water discharging port 5 side of a hot-water supplying passage 3. When hot-water, having a temperature higher than an operating temperature, is conducted through the hot-water supplying passage 3, the shape memory spring 14 is contracted to close the hot-water discharging port 5 whereby small flow rate condition, in which only a discharging port 12 is opened, is obtained. Further, a shape memory spring (opening and closing valve driving unit) 24 is hooked by the shape memory alloy, etc., to a spring hooking part 23 on the upper surface of a lip piece 7 and the lower end part of a spindle 21 respectively. When hot-water, having a temperature higher than the operating temperature, is conducted through the hot-water supplying passage 3, the shape memory spring 24 is contracted to close the hot-water supplying passage 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub discharge device. More specifically, it relates to a bathtub hot water supply device used for supplying hot water to a bathtub from a water heater having a reheating function with high-temperature hot water.

[0002]

2. Description of the Related Art In the case of a bathtub connected to a water heater having a high-temperature hot water supply function, for example, 90
You can reheat the hot water in the bathtub by pouring hot water of about ℃. However, when such hot water is poured into the bath when the bath is empty, there is a problem in terms of safety and bath protection.

[0003] For example, if the operator touches the switch for hot water by mistake while entering an empty bathtub and cleaning the bathtub,
Since hot water is discharged into the bathtub, there is a problem of danger to the human body such as burns. Also, if the bathtub is made of artificial marble, and you switch the hot water (low-temperature hot water) and reheating (high-temperature hot water) switches by mistake, if the hot water is poured into the empty bathtub at a high temperature, it will be made of artificial marble. There is a risk that hot water will come into direct contact with the bathtub and the bathtub surface will become discolored or cracked.

To solve such a problem,
There is a bathtub hot water outlet device C disclosed in Japanese Utility Model Laid-Open No. 2-116644. FIG. 7 shows a front cross-sectional view of this bathtub hot water outlet device C. The bathtub hot water supply device C is attached to the side wall of the bathtub, and when the hot water for hot-water reheating is injected into the hot water supply passage 51 connected to the water heater, the hot water is supplied to the upper end of the discharge passage 52. It flows into the discharge passage 52 through the groove 53 formed in the portion. On the other hand, when high-temperature hot water flows through the discharge passage 52, the lower end of the suction passage 54 becomes negative pressure, so that the hot water in the bathtub sucked from the front suction port 55 is sucked from the suction passage 54 to the discharge passage 52, The hot water and the hot water in the bathtub are mixed and discharged from the discharge port 56 at the lower end of the discharge passage 52. The hot water discharged from the discharge port 56 is a spring 57 made of a shape memory alloy.
However, if there is hot water above the suction port 55 in the bathtub, the temperature of the hot water discharged from the discharge port 56 is lower than the operating temperature (transformation point) of the shape memory alloy spring 57. Therefore, the spring 57 made of shape memory alloy is kept in the extended state, and the valve 58 in the hot water supply passage 51 is kept in the open state.

On the other hand, when there is no hot water above the height of the suction port 55 in the bathtub, the hot water in the bathtub is not introduced into the discharge passage 52, so hot water is discharged from the discharge port 56. When the hot water discharged from the discharge port 56 is touched, the shape memory alloy spring 57 changes its shape and contracts, and the valve 58 in the hot water supply passage 51 is driven against the spring 59 and the valve 5
8 is pressed against the valve seat 60 and closed. Therefore, when sufficient hot water does not remain in the bathtub, high-temperature hot water is not discharged from the bathtub discharge device C, the safety of the user is maintained, and damage to the bathtub is prevented.

A compression spring 6 is provided on the side of the hot water supply passage 51.
A hot water filling valve 62 is provided which is biased in the closing direction by 1. When filling the bathtub with hot water, a large amount of hot water is supplied, so the hot water pressure causes the hot water filling valve 62 to open,
For example, hot water can be discharged from an opening (not shown) formed in the support portion 63 of the hot water filling valve 62, and a large amount of hot water can be quickly supplied. On the other hand, at the time of reheating, since the flow rate of the hot water supplied from the hot water supply passage 51 is restricted, the water filling valve 62 is kept closed by the compression spring 61.

[0007]

However, in the bathtub hot water supply device C shown in FIG. 7, the structure is such that the filling valve is opened and closed by the pressure of the hot water supplied from the hot water supply passage. Sometimes does not work, and it was difficult to share bathtub hot water equipment.

For example, when a high-capacity water heater is used, a considerable amount of hot water can be discharged even when the hot water is discharged. Therefore, if a large amount of hot water is supplied even during reheating, There is a risk that the hot water filling valve will open due to the pressure, the mixing ratio of the hot water to the hot water in the bathtub will increase, and hot water will be discharged. Even when the discharge temperature is higher than the operating temperature of the shape memory alloy spring, a large amount of hot water may flow out before the valve closes due to the large flow rate of the shape memory alloy spring. There was and was dangerous.
On the contrary, with a small capacity water heater, a large amount of hot water cannot be discharged even when filling water, so the filling valve does not open even when filling water, and the amount of hot water supply is limited and the filling operation takes a long time. There is a fear. Therefore, in this bathtub hot water supply device C, it is necessary to prepare a large variety of compression springs for closing the filling valve according to the ability of the water heater, and it is difficult to share the bathtub hot water supply device. there were.

Besides, in regions where the tap water pressure is low, only a low flow rate of hot water flows even if the water quantity control valve (overflow prevention valve) of the water heater is fully opened, and the water filling valve is opened when filling water. There is a fear of not. Similarly, if the tap water pressure is temporarily reduced due to water shortage due to abnormal drought, the bathtub hot water equipment that had been operating normally until then will not operate normally, and the water filling valve will It may not open.

When the hot water supply device does not have a function of restricting the amount of hot water supplied when hot water is hot like a solar water heater, the water filling valve opens and a large amount of hot water flows even when hot water is hot water. I'm worried.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and an object thereof is to enhance the operation reliability of the water filling valve provided in the bathtub hot water supply device. .

[0012]

A bathtub hot water supply device according to the present invention is a hot water supply passage for guiding hot water supplied from a water heater, an opening / closing valve for opening and closing the hot water supply passage, and a flow rate for switching the opening degree of the hot water supply passage. A regulating valve, a flow regulating valve drive section using a shape memory material for sensing the temperature of hot water flowing in the hot water supply passage to drive the flow regulating valve, and the flow regulating valve in a state in which the flow regulating valve is switched to at least a small opening degree. An on-off valve drive unit made of a shape memory material for driving the on-off valve by sensing the temperature of hot water discharged from the hot water supply passage. When the sensed temperature of the flow rate control valve drive unit is equal to or higher than a predetermined temperature, the flow rate control valve operates to switch to a small opening, and when the sensed temperature of the on-off valve drive unit is equal to or higher than the predetermined temperature, The feature is that the on-off valve is activated to close the hot water supply passage.

Further, in this bathtub hot water supply device, a discharge portion for discharging hot water from the hot water supply passage to the outside when the flow rate adjusting valve is switched to a small opening is provided opposite to the opening / closing valve drive portion. May be.

[0014]

In the bathtub hot water supply device of the present invention, the flow rate adjusting valve drive unit senses the temperature of the hot water flowing in the hot water supply passage, and if the temperature of the hot water flowing in the hot water supply passage is equal to or higher than a predetermined temperature, the flow rate adjusting valve drive unit causes The adjustment valve is driven to narrow the opening of the hot water supply passage. That is, since the flow rate adjusting valve is opened during filling with hot water (low-temperature hot water), a large amount of hot water can be supplied and filling can be performed in a short time. On the other hand, since the flow rate adjusting valve is closed during reheating (high-temperature hot water), the flow rate of hot water supplied can be reduced.

Since the flow rate adjusting valve is operated in accordance with the temperature of the hot water flowing in the hot water supply passage in this manner, the flow rate adjusting valve is operated by the water pressure of the hot water flowing in the hot water supply passage. Moreover, there is no fear that the operation of the bathtub hot water supply device will change depending on the size of the water heater, and the bathtub hot water supply device can be shared. Further, there is no fear that the operation of the bathtub hot water supply device becomes unstable even if the tap water pressure changes, and the reliability of the bathtub hot water supply device is improved.

Moreover, since the on-off valve drive unit and the flow rate adjustment valve drive unit using the shape memory material are used,
When the temperature exceeds the predetermined temperature, the on-off valve drive unit and the flow rate adjustment valve drive unit discontinuously deform to drive the on-off valve and the flow rate adjustment valve, improving the responsiveness to the temperature of the hot water supplied. can do.

Further, at the time of reheating, if hot water is in the bathtub up to the height of the bathtub hot water supply device, the hot water discharged from the hot water supply passage will reach the open / close valve drive unit. Since the temperature of the hot water is lowered by mixing with the hot water, the sensed temperature of the on-off valve drive unit becomes low, the on-off valve drive unit does not operate, and the on-off valve is kept open. On the other hand, when there is no hot water remaining in the bathtub up to the height of the bathtub hot water supply device, the hot water discharged from the hot water supply channel directly hits the open / close valve drive unit without mixing with the hot water in the bathtub. The sensed temperature of the drive unit rises, the on-off valve drive unit operates, and the on-off valve is closed. Therefore, the safety of the user when cleaning the bathtub can be improved, and even if the bathtub is made of artificial marble, the bathtub made of artificial marble is not damaged.

Further, since the hot water can be discharged from the discharge port toward the on-off valve drive section facing the flow control valve in a state where the flow control valve is narrowed to a small opening, the flow control valve opens during the reheating operation. When the hot water is sprayed from the discharge port to the on-off valve drive unit when there is no hot water remaining in the bathtub up to the height of the on-off valve drive unit, the on-off valve drive unit is driven. The on-off valve can be closed quickly. Therefore, the responsiveness of the on-off valve is improved, and the safety during reheating is further improved.

[0019]

1 (a) and 1 (b) are a sectional view and a front sectional view showing a state in which a bathtub discharge device A according to an embodiment of the present invention is attached to a side wall 1a of a bathtub 1. FIG. As shown in FIG. 1 (a), the bathtub hot water outlet device A is attached to the lower portion of the side wall 1 a of the bathtub 1. A bent hot water supply passage 3 is formed in the casing 2 of the bathtub hot water supply device A.
Both ends are a hot water inlet 4 and a hot water outlet 5. The hot water inlet 3 side of the hot water supply passage 3 is connected through a pipe 6 to a hot water supply device (not shown) having a hot water filling (low temperature hot water) function and a reheating (high temperature hot water) function. Further, a lip piece 7 extends horizontally from the lower end portion of the casing 2, and a flow rate provided at the upper end portion of a shaft portion 9 that is vertically slidably inserted into a shaft portion support hole 8 of the lip piece 7. The regulating valve (hot water filling valve) 10 is the hot water supply passage 3
It is arranged to face the hot water outlet 5 of the
Zero is biased in the opening direction by a tension spring 11 arranged between the lower surface of the flow rate adjusting valve 10 and the lip piece 7.
Here, a slit-shaped outlet 12 is cut out at a part of the hot water outlet 5 of the hot water supply passage 3, and when the flow rate adjusting valve 10 is projected upward and the hot water outlet 5 is closed, the hot water supply passage 3 of the hot water supply passage 3 is closed. On the side of the hot water outlet 5, only the discharge port 12 is opened and the opening degree of the hot water supply passage 3 becomes small, so that the flow rate of the hot water flowing through the hot water supply passage 3 becomes small. On the other hand, when the flow rate adjusting valve 10 is lowered, the hot water outlet 5 is largely opened, the opening degree of the hot water supply passage 3 becomes large, and the flow rate of hot water flowing through the hot water supply passage 3 can be increased. A shape memory spring (flow rate adjusting valve drive unit) 14 made of a shape memory material such as a shape memory alloy or a shape memory resin is provided in the spring storage area 13 located on the hot water outlet 3 side of the hot water supply passage 3.
An upper end and a lower end of the shape memory spring 14 are hooked on a spring hooking portion 15 on the inner surface of the casing 2 and a spring hooking portion 16 on the upper surface of the flow rate adjusting valve 10, respectively. The shape memory spring 14 has a predetermined operating temperature (transformation temperature) T1.
It is remembered that the above contracts, and that it recovers and expands at the operating temperature T1 or lower. The operating temperature T1 of the shape memory spring 14 is higher than the hot water supply temperature at the time of filling water and lower than the hot water supply temperature at the time of reheating, for example, 38 ° C. << T.
It is set to 1 << 90 ° C. Therefore, when the hot water is not flowing in the hot water supply passage 3 or when the hot water having the operating temperature T1 or lower is flowing, the shape memory spring 14 is extended and the hot water outlet 5 is opened to be in the large flow rate state. . On the other hand, when the hot water having the operating temperature T1 or higher flows into the hot water supply passage 3, the shape memory spring 14 is contracted, the hot water outlet 5 is closed, and only the discharge port 12 is opened, resulting in a small flow rate state.

An annular valve seat 17 is provided on the inner periphery of the valve storage area 19 of the hot water supply passage 3, and an opening / closing valve 18 for opening and closing the portion of the hot water supply passage 3 surrounded by the valve seat 17 is a valve seat. It is stored in the valve storage area 19 so as to be opposed to 17. On-off valve 1
8 is fixed to the upper end of a spindle 21 slidably held in a spindle support hole 20 of the casing 2, and the opening / closing valve 18 is fixed by a compression spring 22 inserted between the opening / closing valve 18 and the casing 2. It is elastically urged in the opening direction. Further, the spring retaining portion 23 provided on the upper surface of the lip piece 7 and the lower end portion of the spindle 21 respectively have a shape memory spring (open / close valve drive) formed of a shape memory material such as a shape memory alloy or a shape memory resin. Part 24 is hooked. The shape memory spring 24 is also memorized so as to contract at a predetermined operating temperature (transformation temperature) T2 or higher and to recover and expand at a temperature equal to or lower than the operating temperature T2. This shape memory spring 2
The operating temperature T2 of No. 4 is higher than the temperature when the high-temperature hot water at the time of reheating is discharged to the bathtub 1 and lower than the temperature of the high-temperature hot water, for example, 48 ° C <T2 << 90 ° C. It is better to set to. Therefore, when the hot water is not flowing in the hot water supply passage 3 or the hot water at the operating temperature T2 or lower is flowing, the shape memory spring 24 is in the extended state and the hot water supply passage 3 is opened. On the other hand, when hot water having an operating temperature T2 or higher flows into the hot water supply passage 3, the shape memory spring 24 contracts and the hot water supply passage 3 is closed. Reference numeral 25 denotes a cover that covers the bathtub hot water supply device A, and the cover 25 prevents hot water from directly contacting the bather. The cover 25 is provided with an opening 26 at an appropriate position so that the hot water in the bathtub 1 can freely enter and leave the cover 25 through the opening 26.

Next, the operation of the bathtub hot water outlet device A will be described with reference to FIGS. 2, 3 and 4. FIG. 2 is a cross-sectional view showing an operating state during the filling operation, in which the low-temperature hot water having a set temperature of about 38 ° C. to 48 ° C. is supplied from the hot water inlet 4 into the hot water supply passage 3. In this case, since the temperature of the hot water being supplied is lower than any of the operating temperatures T1 and T2, both shape memory springs 14 and 24 are extended, the opening / closing valve 18 is opened, and the flow rate adjusting valve 10 is also at the hot water outlet. 5 The entire opening is large and the opening is large. Therefore, in this case, the hot water supplied into the hot water supply passage 3 is supplied from the hot water outlet 5 of the hot water supply passage 3 at a large flow rate, and the hot water filling can be completed in a short time.

FIG. 3 shows the inside of the bath 1 (at least the discharge port 12
FIG. 6 is a cross-sectional view showing an operation when a reheating operation is performed in a state where hot water is being supplied (up to a height of or more). At the time of this reheating, hot water having a high temperature of 90 ° C., for example, is supplied into the hot water supply passage 3. In this case, when high-temperature hot water is supplied into the hot water supply passage 3, the temperature of the hot water is higher than the operating temperature T1 of the shape memory spring 14, so that the high temperature hot water is used for the shape memory spring 1.
4 contracts the moment it touches, and the flow control valve 10 allows the hot water outlet 5
Close. Therefore, in a small flow rate state, the hot water is discharged from the outlet 12.
It is discharged from only the shape memory spring 24. However, since the vicinity of the discharge port 12 and the shape memory spring 24 is immersed in the hot water in the bathtub 1 that has penetrated into the cover 25, the hot water discharged from the discharge port 12 is mixed with the hot water in the bathtub 1. As a result, the temperature of the hot water decreases, and the sensed temperature of the shape memory spring 24 does not exceed the operating temperature T2. Therefore,
The on-off valve 18 is maintained in the open state, the hot water in the bathtub 1 is reheated by the high-temperature hot water, and the hot water temperature in the bathtub 1 rises.

FIG. 4 is a sectional view showing an operation when the reheating operation is performed in a state where the bathtub 1 is empty. In this case, when high-temperature hot water is supplied into the hot water supply passage 3, the temperature of the hot water is higher than the operating temperature T1 of the shape memory spring 14, so that the shape memory spring 14 contracts immediately upon contact with the high temperature hot water. The hot water outlet 5 is closed by the flow rate adjusting valve 10. Therefore, the high-temperature hot water flows from the discharge port 12 at the edge of the hot water outlet 5 to the shape memory spring 2
4 is vigorously discharged, and the shape memory spring 24 momentarily contracts upon contact with hot water having a temperature higher than its operating temperature T2.
The on-off valve 18 is immediately closed as shown in FIG. Therefore, even if the reheating operation switch is turned on when the bath 1 is empty, the on-off valve 18 is activated before hot water is discharged into the bath 1.
Can be closed and hot water can be prevented from being discharged into the empty bathtub 1. Then, when the on-off valve 18 is closed, the hot water does not flow into the water heater, so that the flow rate becomes less than the minimum operating flow rate (MOQ), and the operation of the water heater is stopped.

In the embodiment shown in FIG. 1, the flow rate adjusting valve 10
Although the discharge port 12 for spraying high temperature hot water to the shape memory spring 24 in a closed state is provided at the edge of the hot water outlet 5 at the end of the casing 2, the discharge port 12 may be provided at various positions. it can. For example, as shown in FIG. 5A, it may be provided in a groove shape on the upper surface of the flow rate adjusting valve 10. Alternatively,
It may be provided above the hot water outlet 5 of the casing 2 as shown in FIG. In this case, a large amount of hot water flows out from the hot water outlet 5 when the flow rate adjusting valve 10 is open, but when the hot water outlet 5 is blocked by the flow rate adjusting valve 10, the water pressure in the hot water supply passage 3 becomes high. Therefore, hot water is discharged from the discharge port 12 to the shape memory spring 24. Further, it may be formed in a nozzle shape as shown in FIG.

FIG. 6 is a front sectional view showing a bathtub tapping device B according to still another embodiment of the present invention,
Even in this embodiment, the same operation as that of the bathtub hot water supply device A of FIG. 1 can be performed. The main points different from the bathtub hot water supply device A of FIG. 1 will be described. First, the spindle support hole 20 is formed into a tubular shape, and the upper end of the spindle 21 is slidably held by the spindle guide 31. The operation of is stabilized and the on-off valve 18 is surely closed. Further, the shape memory spring 14 for driving the flow rate adjusting valve 10 is housed in the recess 32 provided on the opposite side of the hot water supply passage 3 from the hot water outlet 5, so that the shape memory spring 14 reduces the fluid resistance of the hot water. Further, a valve guide 33 and a discharge nozzle 34 are attached to the hot water outlet 5 of the hot water supply passage 3, and the shaft portion 9 of the flow rate adjusting valve 10 is guided by the valve guide 33 to stabilize the operation of the flow rate adjusting valve 10. . In the state in which the shape memory spring 14 is stretched during filling with water, the flow rate adjusting valve 10 is lowered and the opening degree of the hot water supply passage 3 is increased (the flow rate adjusting valve 10 in the left half of FIG. 6). A large amount of hot water is discharged downward from.
On the other hand, in the state where the shape memory spring 14 is contracted during reheating, the flow rate adjusting valve 10 is raised and the opening degree of the hot water supply passage 3 is decreased (the flow rate adjusting valve 1 in the right half of FIG. 6).
0), a small amount of hot water that is vigorously discharged from the gap between the discharge nozzle 34 and the flow rate adjusting valve 10 is sprayed to the periphery along the inner peripheral surface of the discharge nozzle 34, and is discharged toward the shape memory spring 24. It

In each of the above embodiments, the shape memory springs 14 and 24 made of a shape memory material are configured to contract at a predetermined temperature or higher to close the flow rate adjusting valve 10 or the on-off valve 18. Of course, 14 and 24 may be extended at a predetermined temperature or higher to close the flow rate adjusting valve 10 or the opening / closing valve 18. Further, the on-off valve drive unit or the flow rate adjustment valve drive unit using the shape memory material does not need to be spring-shaped, and the flow rate adjustment valve 10 and the on-off valve 18
It may have any shape as long as it can drive.

Further, in each of the above embodiments, the hot water discharged from the hot water supply passage is directly discharged to the hot water of the bathtub. However, as in the conventional example of FIG. There is no problem even if the hot water is mixed in the device and then discharged into the bath. In this case, the on-off valve drive unit may be arranged inside the discharge passage (mixing passage) or outside the casing.

[0028]

According to the present invention, the flow rate adjusting valve drive portion operates in accordance with the temperature of the hot water flowing in the hot water supply passage, and the flow rate adjusting valve causes the hot water supply passage to operate when the temperature of the hot water flowing in the hot water supply passage is equal to or higher than a predetermined temperature. Since it is driven so as to reduce the opening degree, the flow rate adjusting valve operates regardless of the flow rate of the hot water supplied to the hot water supply passage.
Therefore, whether using a high-capacity water heater or a small-capacity water heater, the temperature of the hot water flowing in the hot water supply passage is used to distinguish between hot water refilling and reheating, and the water heating and reheating can be performed accurately. The flow rate can be adjusted. Therefore, regardless of the capacity of the water heater, the bathtub hot water supply device can be shared.

Further, even in a region where the tap water pressure is low, or when the tap water pressure is temporarily reduced due to a water shortage due to an abnormal drought, the bathtub hot water supply device operates normally, and the flow rate control valve when the water is filled as in the conventional example. It never stops opening. Further, even when connected to the solar water heater, the flow rate adjusting valve does not open to flow a large amount of hot water when hot water is poured. Therefore, according to the present invention, the reliability of the bathtub hot water supply device can be improved.

Further, when hot water does not remain in the bathtub up to the height of the bathtub heating device during reheating, the hot water supply passage is closed by the open / close valve, so that safety in use can be improved and artificial It can protect marble bathtubs.

If hot water is jetted from the nozzle-shaped discharge port toward the opening / closing valve drive section in a state where the opening degree of the hot water supply passage is narrowed, the hot water will stay in the bathtub up to the height of the opening / closing valve drive section. When there is no remaining gas, the on-off valve can be closed promptly, and the safety during reheating can be further improved.

[Brief description of drawings]

FIG. 1 (a) is a cross-sectional view showing a state in which a bathtub discharge device according to an embodiment of the present invention is attached to a side surface of a bathtub.
(B) is a front cross-sectional view of the bathtub discharge device.

FIG. 2 is an explanatory view showing a state during the hot water filling operation of the bathtub hot water discharging device.

FIG. 3 is an explanatory diagram showing a state during the reheating operation of the bathtub hot water outlet device (with bath water).

FIG. 4 is an explanatory diagram showing a state during the reheating operation of the bathtub hot water outlet device (no bathtub water).

5A, 5B, and 5C are schematic views showing another example of the ejection port.

FIG. 6 is a front cross-sectional view showing a bathtub hot water outlet device according to another embodiment of the present invention.

FIG. 7 is a front sectional view showing a bathtub hot water outlet device according to a conventional example.

[Explanation of symbols]

 3 Hot water supply passage 5 Hot water outlet 10 Flow rate adjusting valve 12 Discharge port 14 Shape memory spring (flow rate adjusting valve drive section) 18 Open / close valve 24 Shape memory spring (open / close valve drive section)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Yamamoto 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (2)

[Claims] 1. A hot water supply passage for guiding hot water supplied from a water heater, an opening / closing valve for opening / closing the hot water supply passage, a flow rate adjusting valve for switching the opening degree of the hot water supply passage, and a hot water temperature flowing in the hot water supply passage. Then, by detecting the temperature of the hot water discharged from the hot water supply passage in a state where the flow rate adjusting valve drive unit using a shape memory material for driving the flow rate adjusting valve and the flow rate adjusting valve is switched to at least a small opening degree. An opening / closing valve drive unit made of a shape memory material for driving the opening / closing valve, and when the sensed temperature of the flow rate adjustment valve drive unit is equal to or higher than a predetermined temperature, the flow rate adjustment valve operates to switch to a small opening, The hot-water supply apparatus for bathtubs, wherein when the temperature sensed by the on-off valve drive unit reaches or exceeds a predetermined temperature, the on-off valve operates to close the hot water supply passage. 2. A discharge port for discharging hot water from the hot water supply passage to the outside when the flow rate control valve is switched to a small opening,
The bathtub hot water supply device according to claim 1, wherein the hot water bath device is provided so as to face the on-off valve drive unit.