JPH08284238A - Warm water washing device - Google Patents

Abstract

PURPOSE: To stably jet warm water at suitable temperature from a nozzle by fitting a mixing valve with a shape memory alloy spring, a bias spring and a plunger tube. CONSTITUTION: A plunger 11 varies the open/close area ratio of the cold water inlet 6 of a mixing valve 3 to the hot water inlet 7 thereof, depending on the load balance position of a shape memory alloy spring 9 and a bias spring 10. When a user operates the washing switch of a warm water washing device, a solenoid valve opens and cold water enters from the inlet 6, while hot water enters from the inlet 7. Mixed water so produced flows out from a mixed water outlet 8 via the hollow section of the plunger 11 and the spring 9. In this case, the spring 9 detects the temperature of the mixed water and generates a spring load corresponding to the detected temperature. When the temperature of the mixed water is high, the spring load of the spring 9 increases to push the plunger 11 and works in a direction for increasing the open area of the inlet 6 and reducing the open area of the inlet 7. As a result, the inflow rate of cold water increases and the inflow rate of the hot water is reduced, thereby lowering the temperature of the mixed water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water washing apparatus having a local washing function, and more particularly to a hot water washing apparatus for mixing hot water and cold water to eject hot water of an appropriate temperature.

[0002]

2. Description of the Related Art Conventionally, there has been used a hot water washing apparatus for jetting heated washing water to a local portion for washing. In these conventional cleaning devices, the water in the hot water tank is heated by a heater to a comfortable temperature (about 40 ° C.) and stored, and the hot water is jetted from a nozzle at the time of use.

On the other hand, such as a hotel unit bus
For toilets installed in locations with external hot water supply and water supply facilities, hot water and cold water are mixed by adjusting the ratio of cold water and hot water with a mixing valve that uses a wax-type thermostat, and hot water of appropriate temperature is ejected. was there.

[0004]

In the above-described hot water cleaning apparatus using the hot water tank, it is necessary to store the hot water in an amount necessary for at least one cleaning in the hot water tank.
The hot water tank became large (1 to 3 liters), and the product itself became large. For this reason, there is a problem that the space of the hot water tank is not only a great constraint on the product design, but also the price is high. Further, it is difficult to make the temperature distribution inside the hot water tank uniform, which causes a problem that the temperature of the spouted hot water is not stable.

In the latter type of hot water cleaning device using the mixing valve, the sensitivity of the wax type thermostat is slow, so that the temperature of the spouting water fluctuates and stabilizes when the temperature of the inflow water fluctuates. There was a problem that it took time. Further, since the thermostat is large, the shape is large, which is expensive.

[0006]

In order to solve the above-mentioned problems, in the present invention, in a hot water washing apparatus including a water supply pipe, a hot water supply pipe, a mixing valve, and a nozzle, the mixing valve is a valve case. A cold water inlet connected to the water supply pipe, a high temperature water inlet connected to the hot water supply pipe,
The opening / closing area of each inlet is adjusted by the mixed water outlet to which the nozzle is connected, the shape memory alloy spring that detects the temperature of the mixed water, the bias spring, and the balance between the load of the shape memory alloy spring and the bias spring. It is composed of a plunger and a rubber brake that limits sliding of the valve case and the plunger.

Further, the rubber brake is annularly mounted in a groove portion around the sliding portion of the plunger and has a U-shaped cross section so as to come into contact with the valve case.

Alternatively, the rubber brake is annularly mounted in the groove around the sliding portion of the plunger, and a part of the cross section is U-shaped so as to contact the valve case.

[0009]

With the above-described structure, even if the temperature of the cold water and the hot water flowing into the mixing valve fluctuates, the hot water of an appropriate temperature can be stably ejected from the nozzle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory view showing the structure of the water supply system of the hot water cleaning apparatus of this embodiment. Reference numeral 1 is a water supply pipe, 2 is a hot water supply pipe, 3 is a mixing valve, 4 is a nozzle, 14 is a mixed water supply pipe, and 13 is a hot water tank. The water supply pipe 1 is supplied with water from a water pipe, and branches into a cold water inlet 6 of the mixing valve 3 and a hot water tank 13 to supply cold water. Hot water tank 1
In 3, the cold water is heated to the hot water, and the hot water is supplied to the hot water inlet 7 of the mixing valve 3 via the hot water supply pipe 2. In a unit bath or the like, an external water heater may be used for the warm water tank 13. The cold water and the high-temperature water that have flowed into the mixing valve 3 are mixed at an appropriate temperature in the mixing valve 3, hot water is supplied from the mixed water outlet 8 to the nozzle 4 via the mixed water supply pipe 14 and the electromagnetic valve 17, and the nozzle 4 Hot water gushes from the.

A sectional view of the mixing valve 3 is shown in FIG. 5 is a substantially cylindrical valve case, 9 is a shape memory alloy spring, 10 is a bias spring, 11 is a plunger that slides inside the valve case 5, and 12 is annularly mounted in a groove portion around the sliding portion of the plunger 11. It is a rubber brake that applies braking to the valve case 5. Shape memory alloy spring 9
Has a characteristic that the spring load increases as the temperature rises, and in particular increases rapidly near an appropriate temperature (40 ° C.), the cold water flowing from the cold water inlet 6 and the high temperature water flowing from the high temperature water inlet 7 are mixed and mixed. It is arranged in a water channel that flows out from the water outlet 8. The plunger 11 is configured to change the ratio of the opening / closing area of the cold water inlet 6 and the hot water inlet 7 depending on the load balance position of the shape memory alloy spring 9 and the bias spring 10.

FIG. 3 shows the shape of the rubber brake 12. The cross section of the contact portion 15 with the valve case 5 has the plunger 11
U where a stable contact pressure is maintained between the valve and the valve case 5.
It is shaped like a letter. Alternatively, a non-contact portion 16 may be provided in a part thereof so that the braking force is adjusted to be sufficiently smaller than the load of the shape memory alloy spring 9.

Next, the operation of the above configuration will be described. User can switch the washing switch of hot water washing device (not shown)
Is operated, the solenoid valve 17 opens and the mixing valve 3
Cold water flows in from the cold water inlet 6 and high temperature water flows in from the high temperature water inlet 7, passes through the hollow portion of the plunger 11 and the shape memory alloy spring 9, and flows out from the mixed water outlet. At this time, the shape memory alloy spring 9 detects the temperature of the mixed water and a spring load corresponding to the temperature is generated. When the mixed water is at a high temperature, the spring load of the shape memory alloy spring 9 increases and pushes the plunger 11 to move in a direction of increasing the opening area of the cold water inlet 6 and decreasing the opening area of the high temperature water inlet 7. As a result, the inflow amount of cold water increases, the inflow amount of high temperature water decreases, and the temperature of the mixed water decreases. When the temperature of the mixed water is low, the plunger 11 moves in reverse, the inflow amount of the cold water decreases, the inflow amount of the high temperature water increases, and the temperature of the mixed water rises. As a result of the above operation, the temperature of the mixed water is controlled to an appropriate temperature, flows out into the nozzle 4, and is ejected from the nozzle 4.

The rubber brake 12 is a braking device for suppressing an oscillation phenomenon caused by a time delay in the feedback control system. If the braking force of the rubber brake 12 is too weak, the mixed water temperature vibrates, and if it is too strong, the error between the mixed water temperature and the target temperature increases. Therefore, the stable braking force is maintained, and the braking force is applied to the shape memory alloy spring 9
It is necessary to make it sufficiently smaller than the load. Therefore, the rubber brake 12 has a U shape so that a stable low braking force can be maintained. Further, in order to reduce the braking force, a non-contact portion 16 is provided at a part of the contact portion with the inner circumference of the valve case 5.

By the above-mentioned operation, even if the temperature of the cold water and the temperature of the hot water fluctuate, the hot water having a substantially constant temperature can be jetted from the nozzle 4. Further, since the rubber brake 12 is sufficiently small and exerts a stable braking force, the shape memory alloy spring 9 made of an expensive material may be small in size, which makes the mixing valve 3 small in size and low in price. be able to.

[0017]

As described above, the present invention has the following effects.

(1) In a hot water cleaning device of the type having a built-in hot water tank, the control temperature of the hot water tank can be made higher than before, so the size of the hot water tank can be made much smaller than before, and the product itself Can be downsized. In addition, the downsizing reduces the material cost of the hot water tank, and the support structure of the hot water tank is also lightweight, which can be simplified.
The price of the product can be reduced. In addition, because the installation space for the hot water tank can be made smaller, the freedom of design is improved. Even if the temperature distribution inside the hot water tank fluctuates, the temperature of the jetted hot water is stable and comfort is improved.

(2) In a hot water cleaning device of a type in which high temperature water is supplied from an external water heater, a shape memory alloy spring, which is significantly smaller than a conventional wax type thermostat and has good heat conduction, is used. The sensitive speed is fast, and the stabilization time of the temperature of the spouted water can be greatly shortened. Therefore, the comfort of the user is improved. Further, since the mixing valve is small in size and has a simple structure, the product can be made small in size and low in price.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a water supply system configuration showing an embodiment of a hot water cleaning apparatus of the present invention.

FIG. 2 is a sectional view showing the structure of the mixing valve of the same.

FIG. 3 is an explanatory view showing the shape of a rubber brake in the mixing valve.

[Explanation of symbols]

 1 Water Supply Pipe 2 Hot Water Supply Pipe 3 Mixing Valve 4 Nozzle 5 Valve Case 6 Cold Water Inlet 7 High Temperature Water Inlet 8 Mixed Water Outlet 9 Shape Memory Alloy Spring 10 Bias Spring 11 Plunger 12 Rubber Brake

Claims (3)

[Claims] 1. A hot water washing apparatus comprising a water supply pipe (1), a hot water supply pipe (2), a mixing valve (3) and a nozzle (4), wherein the mixing valve (3) is a valve case (5). ), A cold water inlet (6) connected to the water supply pipe (1), a high temperature water inlet (7) connected to the hot water supply pipe (2), and a mixed water outlet (8) connected to the nozzle (4). ), A shape memory alloy spring (9) for detecting and displacing the temperature of the mixed water, a bias spring (10), and each inflow port by the balance of the load of the shape memory alloy spring (9) and the bias spring (10). A hot water cleaning device including a plunger (11) for adjusting the opening / closing area of (6) and (7) and a rubber brake (12) for restricting sliding of the valve case (5) and the plunger (11). 2. The rubber brake (12) is annularly mounted in a groove portion around the sliding portion of the plunger (11) and has a U-shaped cross section so as to come into contact with the valve case (5). The hot water washing apparatus according to item 1. 3. The rubber brake (12) is annularly mounted in a groove portion around the sliding portion of the plunger (11), and a part of the cross section is U-shaped and comes into contact with the valve case (5). The hot water cleaning device according to claim 1.