JPS583099B2 - Cleaning water heating device for sanitary appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a washing water warming device for sanitary appliances having a mechanism for washing the anus and other exposed parts with warm water after using the toilet.

Conventionally, devices for heating the water used for this cleaning use a nichrome wire as a heat source and a temperature control device such as a thermostat is installed in the water pipe, but hot water overheating protection devices are used. It was necessary.

Since it is necessary to prepare a device for the purpose of temperature control and protection, the number of parts increases, the configuration of the device becomes complicated, and the requirements for occurrence of failure increase accordingly.

In particular, failure of the temperature control function may cause burns.
Since the user's mucous membranes, such as the anus, are particularly sensitive to temperature, malfunctions of various devices in the temperature system can be fatal.

In addition, the temperature of the supplied water differs considerably between summer and winter, so a changeover switch is required. Therefore, if you use an on-off type device such as a thermostat as a temperature control device, the temperature fluctuation range is large and the temperature can be maintained at the optimum temperature. This was extremely difficult.

Furthermore, in conventional heating devices, the temperature of the heat source, such as a nichrome wire, is higher than the control temperature by at least several tens of degrees Celsius, or in some cases a hundred or more degrees Celsius.

Therefore, there is no problem when using the heating device, that is, when hot water is flowing and the heat source is operating, but when you stop using the heating device, the heat source also stops generating heat, but the water does not flow. The residual heat from the heating element is transmitted to the stagnant hot water, the water temperature near the heat source rises, and hot water with a temperature exceeding the set temperature range stagnates near the tap outlet.

Therefore, there is no problem in reusing the hot water after a long period of time after its use has fallen to the set temperature, that is, the appropriate temperature, but if you resume using it before that point, that is, when the hot water temperature exceeds the appropriate temperature. There was a risk of burns to mucous membranes.

On the other hand, as shown in FIGS. 1 and 2, Japanese Utility Model Application Publication No. 49-87153 discloses that ``one or more grooves 12 are provided on one side of the thick metal plate 15, and a positive characteristic curve is provided on the opposite surface. 13 has been proposed, and according to this idea, it is possible to conduct heat transfer without changing the shape of the positive temperature coefficient thermistor attached to the device into any special shape. It has the advantage of being not only highly efficient, but also inexpensive to manufacture, and can be widely used in industry."Also, by using a positive temperature coefficient thermistor that has characteristics suitable for the purpose of use, Not only can water at an appropriate temperature be obtained without the need for any control device, but it also has the advantage that the abnormal rise in tap water temperature immediately after a temporary stop as described above is unlikely to occur.

However, the characteristics of current positive temperature coefficient thermistors require a control range of ±5° or more, making it completely impossible to achieve the precise temperature control performance of ±2°C required for "washing water heating devices for sanitary appliances." It has a fatal flaw.

The present invention eliminates the various drawbacks of the conventional device, simplifies the specific configuration of the device, and is also capable of controlling the hot water temperature so that it always remains constant at 40°C or less without failure. The purpose is to provide a heating device that can.

The washing water heating device for sanitary appliances according to the present invention has a planar heating element with a small heat capacity attached in close contact with one side surface of a thin heat conductive plate made of a material with high thermal conductivity. On the other surface of the conductive plate, a long and thin continuous water pipe made of a material with high thermal conductivity is folded back at approximately the center of the inlet and outlet, and the pipe section from the inlet to the folded part is folded back from the outlet. The pipe parts leading to the water pipe are arranged in a meandering manner over the entire surface in a state that they are adjacent and parallel to each other, and a part of the outer peripheral surface of the water pipe is adhesively fixed to the surface of the heat conductive plate by brazing over the entire length of the water pipe. A temperature detection element for controlling the energization of the planar heating element and controlling the temperature of the hot water tapped is attached to the other surface of the heat conduction plate at a position close to the outlet of the water conduit pipe. It is characterized by:

The present invention will be described below based on embodiments shown in the drawings.
As shown in Fig. 3, a planar heating element 1 is adhered to one side of a heat conductive plate 2 such as a copper plate, and a water conduit with good heat conduction such as a copper pipe is attached to the other side. Place 3 and
Braze the outer surface of the tube at appropriate locations.

The arrangement of the water conduit 3 is shown by 13 and 5 in Fig. 6, and 2 in Fig. 6.
．． 4.6 is a front view of plan views 1, 3, and 5.

Low-temperature water flowing in from water inlet A flows through a water pipe, and a part of the water pipe where the low-temperature water flows and a part of the water pipe located at the end of the flow path of the water pipe where high-temperature water flows meander so that they are next to each other.

Therefore, the amount of heat extracted per area of the heat conductive plate 2 becomes almost uniform.

A temperature detection element 4 such as a thermistor shall be attached to a heat conduction plate near the tap B, and a thyristor may be used as the temperature control device to control the phase of the power supply voltage (alternating current) by the output of the temperature detection element 4. It is possible to obtain highly accurate temperature control.

The one shown in FIG. 7 is another embodiment of the present invention, in which the arrangement of the water pipes etc. are complicatedly modified.

What is shown in FIG. 5 is a graph showing the relationship between the electric heating area and the outlet temperature when the temperature Tc of the heat conductive plate 2 is set at 38° C. and the inlet water temperature is 30° C. and 5° C.

However, the amount of water passing through the water pipe 3 was set to 400 cc per minute.

As you can see from this graph, if the heat transfer area is made sufficiently large, the effect of high or low inlet water temperature will be reduced.

There is no need to provide technical means to switch between summer and winter temperature settings.

As shown in FIG. 4, it is conceivable to embed the water pipe in the heat conduction plate, but this would be difficult and expensive to manufacture.

According to the cleaning water heating device of the present invention having the configuration as described above, the following useful effects can be obtained.

(1) A planar heating element with a small heat capacity is attached closely to one side surface of a relatively thin heat conductive plate made of a material with good thermal conductivity such as copper, and this heat conductive plate is On the opposite surface, a water pipe made of a material with good thermal conductivity, such as a steel pipe, is adhesively fixed to a part of its outer circumferential surface by brazing, so that the water flowing through the water pipe from the planar heating element is connected to the pipe. Thermal conduction is extremely good.

(2) A continuous long and thin water conduit pipe is folded back at approximately the center of its inlet and outlet, and the pipe section from the inlet to the folded section, i.e. the low temperature side pipe section, and the pipe section from the outlet to the folded section, i.e. the high temperature side. Since the pipe parts are arranged in a meandering manner over the entire surface of the heat conduction plate in a state where they are adjacent and parallel to each other, the heat generated by the planar heating element is distributed over the entire length of the water pipe through the entire area of the heat conduction plate. As a result, the amount of heat transferred becomes extremely large, and in combination with the above-mentioned effect 1, the water flowing in the water pipe can be rapidly heated to a desired temperature.

(3) As mentioned above, one continuous long and thin water pipe is turned back around the center of its inlet and outlet, and the low temperature side pipe section and the high temperature side pipe section are placed adjacent to each other and parallel to each other. Since the conductive plate is arranged in a meandering manner over the entire surface of the heat conductive plate, the average temperature of the water flowing inside the low-temperature side pipe portion and the high-temperature side pipe portion, which extend in parallel to each other, is approximately equal to that at each point on the surface of the heat conductive plate. As a result, in combination with the effect of (1) above, effective heat conduction to the water pipes is obtained over the entire surface of the heat conduction plate, which is equivalent to an increase in the effective heat transfer area. The effect is apparent, and even in summer and winter when there is a considerable difference in water temperature, the difference in outlet temperature is small and heated washing water of approximately uniform temperature can be obtained.

(4) The heat capacity of the sheet heating element itself is small, and the heat conduction plate is thin and has a relatively small heat capacity, so the use of the heating device is stopped and the sheet heating Immediately after the body is deenergized, the amount of heat accumulated in the planar heating element and the heat conduction plate is small, and most of this accumulated heat is distributed in parallel adjacent to each other on the surface of the heat conduction plate. Of the extending low-temperature side tube section and high-temperature side tube section, the amount of heat conducted to the low-temperature side tube section, which has a large temperature difference with the heat conduction plate, and then to the high-temperature side tube section is not only extremely small, but also very small. Since the heat in the pipe section also tends to be taken away by the adjacent low-temperature side pipe section, there is no risk that the hot water in the water conduit near the outlet will be heated above the set temperature after the heating device is stopped. If the heating device is restarted after a very short period of time after the device has been stopped, the temperature of the hot water discharged from the outlet will rise abnormally and an undesirable situation such as local burns will not occur. do not have.

(5) Since the temperature detection element is installed on the surface of the heat conductive plate with high thermal conductivity at a position close to the water pipe outlet, it can sensitively and accurately detect the temperature of the hot water discharged from the water pipe outlet. , it is possible to precisely control the energization of the planar heating element according to the detected temperature, and therefore the temperature of the tapped water can be accurately maintained at the set temperature.

(6) The temperature detection element is attached to the surface of the heat conduction plate close to the water conduit outlet as described above, and the planar heating element is energized in the absence of water in the water conduit during a water cutoff. Then, the temperature detection element detects the temperature rise of the heat conduction plate due to the heat generated by the sheet heating element and cuts off the energization of the sheet heating element, which may cause the heating device to run dry. There is no.

(Power) The structure is such that a water conduit is meanderingly arranged on the surface of a thin heat conductive plate and is brazed and fixed to the heat conductive plate. Compared to a heating device, material costs and processing costs are lower, and the product price of the device can be lowered.

[Brief explanation of the drawing]

1 and 2 are a bottom perspective view and a side view of a known liquid heating device, and FIG. 3 is a sectional view showing the configuration of the present invention,
FIG. 4 is a sectional view showing a structure of a device similar to the present invention, and FIG. 5 is a graph showing the relationship between heat transfer area and tapping temperature.
FIG. 6 is a plan view and a side view showing three aspects of a piping example of the present invention, and FIG. 7 is an explanatory diagram of a modified embodiment of the present invention. 1... Planar heating element, 2... Heat conductive plate,
3... Water pipe, 4... Temperature detection element,
5... Temperature control device, A... Water inlet,
B... Hot water outlet.

Claims (1)

[Claims] 1. A planar heating element with a small heat capacity is closely attached to one side surface of a thin heat conductive plate made of a material with high thermal conductivity, and a sheet heating element with high thermal conductivity is attached on the other side surface of the heat conductive plate. A long and thin continuous water conduit pipe made of material is made so that the pipe section from the folded inlet to the folded part and the pipe part from the outlet to the folded part are adjacent to and parallel to each other near the center of the inlet and outlet. A portion of the outer peripheral surface of the water pipe is adhesively fixed to the surface of the heat conductive plate by brazing over the entire length of the water pipe, and the heat conductive plate is attached to the heat conductive plate at a position close to the outlet of the water pipe. A washing water heating device for sanitary appliances, characterized in that a temperature detection element for controlling the temperature of hot water by controlling the energization of the planar heating element is attached to the other surface of the sanitary appliance.