JP2002147853A - Water heating means and local part cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heating device for a local part cleaning device, low in cost and high in safety as well as reliability. SOLUTION: The water heating device for a local part cleaning device, low in cost and high in safety as well as reliability is provided by a method wherein a water heating means equipped with a heat exchanging means wherein a water inlet port is communicated with a hot-water discharging port, a heating means and a heating amount control means, is designed so that the density of heating amount of the heating means is reduced gradually or in stepwise from the water inlet port toward the hot-water outlet port of the heat exchanging means and that the temperature of the heating means and/or the heat exchanging means becomes substantially uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water device for a local cleaning device for heating water to a predetermined temperature.

[0002]

2. Description of the Related Art In recent years, there has been proposed a hot water device in which a thin heating element is buried inside a cylindrical or flat base material, and hot water is generated by passing water through the inner and outer surfaces and the front and back surfaces of the base material. I have.

[0003]

However, in the above-described method for producing hot water, the contact area between the water and the heating section is generally small, and in order to heat the water efficiently, the heating temperature is higher than the desired hot water temperature. The surface temperature of the part can be very high. For this reason, there has been a problem that reliability cannot be obtained with respect to safety unless advanced power control means and emergency high-temperature water discharge prevention means are added. In addition, at the contact point between the heating unit and the water, the temperature of the heating unit is considerably higher than the desired hot water temperature, and the surface temperature of the heating unit is 100 ° C.
Water is brought to a boil near this point, and when metal materials are used for the heat exchanger, water leakage and leakage due to pitting occur over time and precipitation of scales is promoted over time, and the water passage is not visible. There were problems such as clogging and a decrease in flow rate due to an increase in pressure loss, and in the worst case, water cutoff. For example, actual fairness 1-4
Conventional examples of instantaneous water heaters are described in, for example, No. 2557 and Japanese Patent Application Laid-Open No. Hei 10-318605. Hot water is generated by using ceramic as a heater and bringing water directly into contact with the ceramic heater surface. According to this, although it is durable against corrosion such as pitting corrosion, the contact area of the heater with water is small, and in order to heat the water efficiently, the heating section has a higher temperature than the desired hot water temperature. Surface temperatures can be very high.
In addition, the temperature of the water is detected by a thermistor near the outlet of the heat exchanger. In this place, the temperature of the heater cannot be directly detected and controlled. If the heater is turned on when water is not flowing, the temperature of the heater rises even though the temperature of the heater is rising, and the temperature of the heater rises even further. It will be a state of heat runaway. For this reason, water flow detection, water level detection, and even tilt detection for safely operating the water level detection are performed. As described above, unless safety devices with advanced power control means, emergency hot water discharge prevention means, fire prevention measures, etc. are added, the reliability of temperature stability and safety cannot be obtained. There were challenges. In particular, when the amount of water in the air gap or the heat exchanger decreases, and when a part of the heating part of the ceramic heater comes into contact with air, the temperature rises only in the vicinity of the area due to abnormal heating, and the ceramic heater becomes thermally stressed due to the difference in thermal expansion There was a danger of electric leakage and electric shock due to the fact that the electric heating element provided inside was in direct contact with water, resulting in electric leakage and electric shock.

The present invention has been made to solve the above-mentioned problems, and has as its object to provide a low-cost, safe and highly reliable hot water device for a local cleaning device.

[0005]

According to a first aspect of the present invention, there is provided a hot water means comprising a heat exchange means having a water inlet and a water outlet communicating with each other, a heating means, and a heating amount control means. In the above, the heat exchange means is designed such that the heating amount density of the heating means gradually or stepwise decreases from the water inlet to the hot water outlet, and the temperature of the heating means and / or the heat exchange means becomes substantially equal. A hot water means is provided.

According to this, the amount of heat transfer is generally given by heat transfer coefficient × heat transfer area × temperature difference, but the water temperature rises as the water passage approaches the outlet. When the heating amount density of the heating means is made substantially the same from the water inlet side to the tap water side of the heat exchanger, the temperature of the heating means and / or the heat exchange means becomes lower because the water temperature is lower on the water inlet side. On the other hand, the temperature of the hot water at the tap hole side is a desired temperature, but the temperature of the heating means and / or the heat exchange means is higher than this, and may be a dangerous temperature that may cause burns to the human body. In particular, once used, hot water is generated, and due to residual heat of the heating means and / or heat exchange means, hot water having a higher temperature than desired may be discharged at the next use. As in the present invention, by increasing the heating amount density on the water inlet side and decreasing the heating amount density toward the tapping side, the heating means and / or
Alternatively, the temperature of the heat exchange means can be made substantially uniform, so that it can be used safely.

In a second aspect of the present invention, the temperature of the hot water discharged from the tap and the temperature of the heat exchanger are designed to be substantially the same or to be maintained within a certain temperature difference. A hot water means according to the invention is provided.

According to this, in the conventional instantaneous method, the user detects the flow rate, the pressure, the water level, etc. of the water after the water discharge start operation, confirms that the water is flowing, and starts heating the heater. I was Should the water flow detection means break down,
If an erroneous determination is made that water is flowing even though water is not flowing, the water temperature detecting means is generally set to the heat exchange means even though the water inside the heat exchanger is in a boiling state due to heater heating. Since the temperature of the heater is not controlled at the hot water outlet, the temperature of the water in the vicinity of the outlet is low, and the heater runs out of heat, which is dangerous for the human body. Further, if this state continues, the worst situation such as a fire of the apparatus may occur.

If the user repeatedly turns on and off the water, for example, immediately after the water is turned off, the heater O
Despite the FF, a little cold water flows into the heat exchange means, and when the water is continuously turned on, the cold water is discharged from the nozzle for a moment and the cold water suddenly stimulates the local area of the user, resulting in mental health. Sometimes it was painful.

[0010] Conversely, despite the fact that the water is turned off, the temperature of the heat generating portion of the heater may generally rise to 150 ° C or higher. Due to the residual heat, the water inside the heat exchanger is heated, and when the user turns on the water again, there is a danger that hot water spouts from the nozzles and burns the delicate local part of the user.

On the other hand, in the present invention, since the temperature of the heat exchange means and the temperature of the hot water discharge are made substantially the same, the heater is turned on by detecting the seating of the user, for example, without detecting the flow of water. Alternatively, the heater can be turned on when the user enters the room by the human body detecting means. Thus, the heater, the heat exchange means, and the water inside the heat exchange means also have a sufficiently desired temperature at the time of the user's water discharging operation, and the problem that cold water suddenly flows is eliminated. The residual water from the heat exchange means to the tip of the nozzle can be heated by placing the heat exchange means near the nozzle housing of the apparatus main body. Further, it may be used for nozzle cleaning, waste water, and pre-cleaning of a toilet bowl surface before local cleaning. Further, the heater may be turned on at the time of the water discharging operation by the user.

Furthermore, since the heating can be performed even when the water is not flowing, the problem that the water in the device freezes and breaks the hot water device and the surrounding piping, for example, in the winter night, can be dealt with by draining water. Although a dedicated heater is attached, the heating means can be always turned on in this apparatus, and the apparatus can be used without freezing inside.

The usable power capacity in a general household is 1500 W or less, and more practically about 1200 W. For example, the incoming water temperature is 10 ° C. and the flow rate is 0.5 L /
Considering the case of warming water for a minute, the water discharge temperature becomes 40 ° C. at 1200 W increased by 30 ° C. However, if a heating means designed with a constant heating amount density is used, when the tapping side of the heating means is a heat exchanger having substantially the same discharge water temperature, the discharge water temperature becomes 4 ° C.
When the temperature reaches 0 ° C., unless the heating amount is reduced, the temperature of the heat exchanger rises and becomes a temperature at which a human body is burned. Therefore, if power control is performed to control the temperature within a range that is not dangerous to the human body, the total input power is 1200 W
It becomes below and cannot generate hot water efficiently. In the present invention,
The heating density of the heating means on the inlet side, where the temperature tends to be low, is increased, and the heating density is gradually and / or toward the outlet side.
Alternatively, the power capacity can be effectively used for hot water generation by performing the design stepwise.

According to a third aspect of the present invention, there is provided any one of the first and second aspects of the invention, characterized by a heating means having an electrode structure designed to adjust the heating amount density by the distance between the electrodes. Provide a means of hot water.

According to this, even when the electric resistivity of the heating means is constant, the temperatures of the heating means and / or the heat exchange means can be arbitrarily made substantially uniform from the water inlet to the hot water outlet. In general,
The electric resistance R of the heater is R = ρ × L / S (where ρ:
If the electrical resistivity of the material of the PTC (positive temperature coefficient of resistance) heater is substantially constant, the electrical resistivity is given by the electrical resistivity, L: the space between the electrodes, and S: the cross-sectional area of the current flow. The resistance increases and the amount of heat generated as a heater decreases. The space between the electrodes on the water inlet side is narrow, and the space between the electrodes is widened toward the water outlet, so that the heating amount density on the water inlet side is increased stepwise toward the water outlet side, and / or
What is necessary is just to design the heating amount density gradually smaller.

According to a fourth aspect of the invention, the heating means has a self-temperature control function.
A hot water means according to any one of the inventions is provided.

According to this, an expensive control such as an electronic control means is not required, and a heating function and a self-temperature control function are possible, and the number of parts can be reduced at low cost, so that high reliability can be obtained. In addition, as a heater having a self-temperature control function, there is a PTC (positive temperature coefficient of resistance) heater, and even if a failure occurs, the heater is in a failure mode in which heating is not performed without thermal runaway, so that the heater is essentially safe. Thereby, it is not necessary to use a flame-retardant grade or a high heat-resistant grade for the resin material near the heater, which can contribute to cost reduction.

Another advantage of the PTC is that if the temperature rises too much, the power is controlled by itself to control the temperature rise further. If there is an air layer due to insufficient heat coupling, for example, if there is an air layer, heat cannot be transmitted to the heat exchange means only at the normal heating means, the temperature will rise steadily, abnormal heating will occur, and the heating means will break down, break or burn. However, since the present invention has a self-temperature control function at each point in the PTC heating means, heat spots do not essentially occur and can be used safely. it can.

In the case where the temperature of the hot water to be locally cleaned is to be changed and the temperature control of the heating means and the heat exchange means is performed by the simple electronic temperature control, the temperature setting of the control means may be arbitrarily changed. Good. Furthermore, in the case of a heating means having a self-temperature control function, in order to perform an operation of keeping the temperature constant, if it is desired to change the spout water temperature,
A means for mixing and adjusting with water may be provided downstream of the hot water means to finely adjust the temperature.

According to a fifth aspect of the present invention, there is provided the hot water means according to any one of the first to fourth aspects, wherein the heating means is thermally coupled to the heat exchange means via the soaking means. provide.

According to this, even if the heating means is not provided on the entire surface of the heat exchange means, the heat can be diffused to the heat exchange means via the heat equalizing means, so that the heating means may be compact and contribute to a low cost of the heating means. it can. Further, the heat equalizing plate makes the heat exchange means uniform so that a desired temperature can be easily obtained.

Further, when the heating means needs to heat a large area, the temperature of the heating means tends to decrease near the water inlet and tends to increase near the outlet, and for example, the heating means may be ceramic. In the case where the ceramic heating means is used, for example, a thermal stress is generated due to a difference in thermal expansion caused by temperature unevenness in the heating means, and the ceramic heating means is broken.

Furthermore, if the heat coupling between the heating means and the heat exchange means is insufficient and there is an air layer or the like in one place, heat will not be transmitted there, and only a part of the heating means will cause abnormal heating ( (Heat spot) Danger can be prevented and reliability can be increased.

As the thermal coupling means, welding such as brazing or soldering, a conductive heat conductive adhesive, an insulating heat conductive adhesive, and a gel adhesive such as silicone grease can be suitably used.

As the heat equalizing means, copper, graphite, aluminum, BN, ALN, SiC or the like having good heat conductivity may be used, or if a means having higher heat conduction and heat transport properties such as a heat pipe is used. It is suitable. In particular, it is preferable to use a plate that can be formed into a flat plate shape such as a loop type and that can transport heat uniformly.

According to a sixth aspect of the present invention, there is provided the hot water means according to any one of the first to fifth aspects of the present invention, wherein an inlet and a tap are provided adjacent to each other.

According to this, the temperature distribution of the heat exchange means is:
As compared with the case where this is not performed, the distance is made substantially equal, and the design of the heating means becomes easier.

According to a seventh aspect of the present invention, there is provided the hot water means according to any one of the first to sixth aspects, wherein the heat storage means is thermally coupled to the heating means and the heat exchange means.

According to this, heat can be quickly taken in and out of the heat storage means by using the heat equalizing means, so that only heat energy is stored as in semi-hot water storage, and hot water is generated instantaneously when hot water is required. Since it is possible, conventionally, when hot water is stored at, for example, 40 ° C., there is no problem that bacteria will propagate after one day, and in local washing, inflammation can be prevented and sanitary use is possible. Heat storage alone or a combination of heaters may be used. In addition, since the capacity can be made smaller than a normal hot water storage tank capacity, heat energy loss due to heat radiation can be reduced and energy can be saved.

Also in the instantaneous method, it can be used as auxiliary heat energy of the heating means. For example, the power capacity that can be used in a general household in Japan is often 1500 W or less, and the temperature at which the temperature can be raised is naturally limited by the amount of water. (For example, the temperature rise temperature range of water at a flow rate of 0.7 L / min with an electric power of 1200 W is the inlet water temperature plus approximately 25 ° C., and when the incoming water temperature in winter is 5 ° C. or less, the outlet water temperature reaches only 30 ° C.) If the heat storage energy can be quickly taken out as in the present invention, the temperature rise range and the water amount can be set according to the power and the heat storage amount by the instantaneous power plus the heat storage energy heating.

The pressure resistance of tap water may be only the heat exchange means, and the heat storage section does not require a pressure resistance structure, which can contribute to cost reduction. In particular, when the conventional hot water storage system has a large capacity, if the hot water storage tank is made to have a pressure-resistant structure, the cost and the weight become large, which is not practical. For example, in a conventional electric water heater or the like, the tap water pressure is reduced and the gauge pressure can be used only at 1 kg / cm2 or less, and a desired flow rate cannot be obtained if there is a pressure loss due to a long pipe or the like. When pressure was desired, a pressurized pump was used together. According to the present invention, such a problem can be solved, and the user can perform a stimulating washing action.

The heat storage tank preferably has a structure capable of keeping heat adiabatic. For example, in the case of a container having a vacuum insulation wall made of stainless steel or the like, once the desired hot water temperature is reached, the temperature is maintained at a substantially constant level for more than one day and night, and almost no energy is conventionally required for keeping the temperature. This can be realized at a relatively low cost because the heat storage tank does not need to have a pressure-resistant structure as described above. For example, when assembling the heat exchange means by a vacuum brazing method, the vacuum vessel is naturally made because the brazing is necessarily performed in a high vacuum.

According to an eighth aspect of the present invention, there is provided the hot water means according to the seventh aspect, wherein the heat storage means is a latent heat storage material.

According to this, if the latent heat type is used as the heat storage material, it can be set to a substantially constant temperature during melting or solidification.
Combined with the desired hot water temperature and heat exchange means having substantially the same temperature, it is possible to supply hot water at a constant temperature. For example, paraffin can be repeatedly melted and solidified at about 40 ° C. if the molecular weight is selected. If there is a soaking means in the heat storage tank, heat can be quickly taken in and out of a large-capacity heat storage material, so that it can be used not only for a local cleaning device but also for a heat storage instantaneous hot water device.

If a supercooling type heat storage material is used, once it is melted, even if the temperature falls below the freezing point, the heat storage material can be set in a supercooled state without solidifying. When a stimulus or the like is given, it starts to coagulate and release the stored heat energy. If this is used, there is no need to keep the heat, and an energy-saving heat storage water heater can be obtained.

According to the ninth aspect, at least the outermost surface of the heat exchange means in contact with water is provided with Si oxide and / or carbonic acid C.
a hot water means according to any one of the first to eighth inventions, characterized in that a layer that is hardly adhered or easily peeled off is formed on the water scum composed of a or the like. .

According to this, the cross-sectional area of the water passage of the heat exchanging means can be reduced, and the heat exchanging means can be made compact. As the hardly adherent or easily peelable layer, a silicone-based, fluorine-based, silane compound having a fluoroalkyl group, or a molten Sn plating can be preferably used. As a property of these materials, their surface energy is low and even if they come into contact with other substances, their attraction is weak,
It utilizes the property that it is difficult to attach and that it is easy to remove.

According to a tenth aspect, there is provided the hot water means according to any one of the first to ninth aspects, wherein a prefilter is provided upstream of the heat exchange means.

According to this, red rust which has been pumped into the water in a water storage tank for cleaning clean water, well water or toilet bowl, metal rust in piping work, and foreign matter derived from microorganisms such as slime and mold. Can be trapped to prevent clogging of the water passage of the heat exchanger. Further, a structure that can be attached and detached so that the filter can be appropriately cleaned can be used. As the pre-filter, a metal wire mesh, a sintered metal porous body, a felt-like metal, or the like, or other organic resin can be used as appropriate. A metal containing a component having an antibacterial function, such as Cu, Zn, or Ag, is preferable. Alternatively, a resin containing an antibacterial metal, an inorganic antibacterial agent, and an organic antibacterial agent may be used. By providing the antibacterial function, the growth of bacteria on the filter surface can be suppressed, and for example, troubles such as generation of slime on the filter surface and clogging of the filter can be prevented.

In the eleventh aspect, the first to tenth aspects are described.
A local cleaning device provided with the hot water means according to any one of the inventions.

According to this, it is suitable for a toilet space where compactness is required, and for a warm water flush toilet seat incorporated in a toilet seat.

In recent years, water-saving and high-performance washing water, such as a massage function, stimulates the vicinity of a local area by intermittently supplying a water flow, thereby producing an effect of promoting convenience. The local part has a more sensitive sense of temperature than other parts,
It was necessary to maintain a stable hot water temperature, and the water flow changed suddenly, such as intermittently, and advanced control was essential to stably control the hot water temperature. Therefore, it has been an expensive device equipped with expensive electronic control means. ADVANTAGE OF THE INVENTION According to this invention, the heat exchanger temperature and the tap water temperature can also be made substantially the same, and there exists an advantage that a stable water temperature can be supplied by simple and low-cost control.

Further, by appropriately combining the constituent elements according to the present invention and the constituent elements according to the above-mentioned inventions, it is also possible to provide a local cleaning apparatus provided with a hot water means having these effects.

In addition, the hot water apparatus utilizing the present invention is not limited to this, and can be suitably used for washing toilet bowls and urinals, for washing various human bodies, dishwashers, and the like. Further, if the heating means having the configuration of the present apparatus is a cooling means, it is possible to provide an efficient cooling water apparatus. It can be suitably used for promoting blood circulation by alternately using cold water and hot water.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hot water device for a local cleaning device according to the present invention will be described. It should be noted that the configuration of the local cleaning device is well known in the related art, and thus illustration and details are omitted.

(First Embodiment of Hot Water Device) FIGS. 1 and 2 show an outline of a hot water device for a local cleaning device according to the present invention.

FIG. 1 is an external view of a water heater, in which water is supplied from a water inlet 2 and flows through a cylindrical heat exchange means 4 to be taken out as hot water from a water outlet 3. In the process, the flat PTC heater 1 is thermally bonded to both surfaces of the heat exchanger 4. The method of thermal bonding may be fixed by heat transfer grease or heat transfer adhesive. Also, they may be joined with solder or the like. In this configuration,
Since the PTC heater is used at a temperature that is not dangerous to the human body, organic materials can be used.

FIG. 2 is a structural view showing the inside of the heat exchanger, in which a corrugated plate 6 forming a water passage is inserted between members 7 and 8 constituting a cylindrical heat exchanger. These members 6, 7,
8 is made of, for example, copper and is firmly fixed by a brazing method. In addition, not only copper but also SUS can be used. In the case of a material using an electrically insulating material such as a ceramic heater, a structure that directly contacts water may be used. Further, in the present embodiment, an example in which the water inlet is on the lower surface and the outlet is on the upper surface is shown. However, it may be designed appropriately, for example, both upper surfaces, both lower surfaces, or the water inlet 2 is the upper surface and the outlet 3 is provided. May be the lower surface. Further, the positions of the water inlet 2 and the outlet 3 need not be substantially at the center of the heat exchanger main body 4 in the width direction (perpendicular to the flow of water), and may be located on either side. In particular, when the heat exchanger main body 4 is disposed sideways, if it is on the side surface, it can be suitably designed when draining water.

FIGS. 3 and 4 show examples in which the heating amount density is designed according to the distance between the electrodes according to the present invention. FIG. 3 shows a cross-sectional structural view of the water heater. Electric insulating layers 11 on the upper and lower sides of the heat exchanger body 4
, The PTC heater 10 is thermally coupled. Electrodes 9 are alternately formed in a comb shape on the surface, and a voltage is applied to this.

FIG. 4 shows a top view of the electrode structure. The gap between the electrodes on the water entry side is narrow, and the gap between the electrodes on the water tapping side increases. Generally, the electric resistance R of the heater is R = ρ × L / S (where ρ: electric resistivity,
When the electrical resistivity of the material of the PTC (positive temperature coefficient of resistance) heater is substantially constant, the electrical resistance increases as the interval between the electrodes is increased. In addition, the amount of heat generated by the heater decreases.

Although the electrode structure is formed on the entire surface of the PTC 10 in consideration of the easiness of explanation, both electrodes of the electrode are not limited to this, and may be formed on the front and back of the PTC 10, respectively.

FIG. 5 shows a part of another example of the shape of the water passage formed by the components constituting the water passage in the heat exchanger body 4. The cross-sectional shape of the water channel is not limited to a rectangle, and a trapezoidal, triangular, elliptical, or star-shaped shape having a larger outer circumference length than the water channel cross-sectional area is advantageous. Alternatively, a shape obtained by combining these shapes may be used, or a complicated shape in which the water passage is bent several times like a three-dimensional network structure is preferable. In particular, it is preferable that the ratio of the cross-sectional area of the water passage / the length of the outer circumference is approximately 1/4 or less.

As a method of manufacturing the inside of these heat exchange means, a plate-like metal may be formed by pressing and joined by brazing, or the shape shown in FIG. 2 may be integrally formed by forging press or die casting. Is also good.

FIG. 6 is a conceptual diagram explaining that the desired hot water temperature and the temperature of the heat exchange means are substantially the same. In the figure, the horizontal axis represents the sum of the water passage lengths, and the vertical axis represents the hot water temperature. As the water passage length increases, the warm water temperature rises and approaches the wall surface temperature of the heat exchange means. By designing the total length of the water passages to be somewhat longer, the water passage wall temperature can be made substantially the same as the desired hot water temperature. Thereby, since the maximum temperature in the heat exchange means is substantially the same as the desired hot water temperature, an essentially safe hot water device can be obtained. By appropriately designing the sum of the lengths of the water passages, it is possible to design such that a certain temperature difference is maintained between the wall temperature of the water passage in the heat exchange means and the desired hot water temperature.

(Second Embodiment of Water Heating Apparatus) FIG. 7 shows another example in which the heating density is changed stepwise. The symbol 4 in the figure is a top view of the heat exchanger body viewed from a direction perpendicular to the flow direction of the water flow, and the electric resistivity ρ is stepwise changed on the plane through an electric insulating layer. This is an example in which the PTC element group 13 is arranged by adjusting the electric resistivity ρ such that the electric resistance gradually increases from the water inlet side to the tap water side, and thermally coupling.

(Third Embodiment of Water Heating Apparatus) FIG. 8 is a graph showing a change in tapping temperature of a third embodiment of the water heating apparatus according to the present invention in which the heating density is designed stepwise. In this graph, the parts constituting the heat exchange means are made of copper and have a thickness of 1 mm in the plane portions 7 and 8 shown in FIG. 2, a cross section between these upper and lower surfaces is rectangular, having a length of 5 mm, a width of 0.5 mm and a length of 1 mm.
Many thin water passages of 20 mm were formed in parallel. The thickness between the water passages was 0.1 mm. A heater is provided only on one side of this heat exchanger, and as a heating amount density control, the input electric energy is divided into three in the flow direction of water, and the heater capacity is divided into three so that the heater temperature does not exceed 40 ° C. 1200 total
The temperature was controlled within the range of W. The tapping temperature at a tapping temperature of 15 ° C. and a tapping flow rate of 0.7 L / min was evaluated.

FIG. 8 shows the evaluation results. The parameter display in the figure indicates that the heater is divided into three equal parts and the heating amount density is changed in three stages. In addition, the horizontal axis represents the sum of water passage lengths obtained by multiplying the number of water passages formed in parallel by the length of one water passage when a large number of narrow rectangular water passages having a length of 120 mm are formed in parallel. I have. As can be seen from the results, when the lengths of the water passages are the same, 600/40 at a total of 1200 W as compared with the case where the heating amount density of the three divided heaters is constant.
It can be seen that the water discharge temperature can be increased by setting the heating port density to 0/200 W and the water inlet side at a higher heating density. On the other hand, it can also be seen that the tapping temperature increases as the total length of the water passage increases.

FIG. 9 is a block diagram showing a water heater according to the present invention. It is composed of a heat exchange means in which the water inlet and the water outlet communicate with each other, a heating means for supplying heat energy thereto, a temperature control means for controlling the temperature of the heating means, and an energization control means for controlling whether or not the heating means is energized. .

The temperature of the heat exchange means is controlled to be constant by the temperature control means so as to be maintained at substantially the same or within a certain temperature difference. However, from the viewpoint of energy saving, it is preferable that preheating can be performed immediately before use by the user. Therefore, the heating means and the temperature control means are turned on and off by the power supply control means. As described above, the detection of the user serving as the source of the energization control can be used as appropriate, such as human body detection and seating detection.

[0060]

According to the construction described above, the present invention relates to a hot water means comprising a heat exchange means having a water inlet and a water outlet communicating with each other, a heating means, and a heating amount control means. Low cost and safe by designing so that the heating amount density of the heating means gradually or stepwise decreases from the water inlet to the hot water outlet and the temperature of the heating means and / or heat exchange means becomes almost equal. It has become possible to provide a hot water device for a local cleaning device with high reliability and reliability.

[Brief description of the drawings]

FIG. 1 is an external view illustrating an example of one embodiment of the present invention.

FIG. 2 is an exploded view illustrating an example of one embodiment of the present invention.

FIG. 3 is a cross-sectional structure diagram illustrating an example of one embodiment of the present invention.

FIG. 4 illustrates an example of an interval between electrodes of a heating unit illustrating an example of one embodiment of the present invention.

FIG. 5 illustrates an example of a water passage according to one embodiment of the present invention.

FIG. 6 is a conceptual diagram illustrating that the desired hot water temperature and the temperature of the heat exchange means of the present invention are substantially the same.

FIG. 7 illustrates an example in which the heating density according to one embodiment of the present invention is changed stepwise.

FIG. 8 is a graph showing evaluation results of one embodiment of the present invention.

FIG. 9 is a block diagram illustrating a structure of one embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flat-plate-shaped heating means having a self-temperature control function 2 ... Water inlet 3 ... Hot-water outlet 4 ... Heat exchanger main body 5 ... Power supply terminal to heating means 6 ... Component parts forming a water passage of a heat exchanger 7 ... Components that form the tubular shape of the heat exchanger 8 Components that form the tubular shape of the heat exchanger 9 Example of the electrode structure on the heating means 10 Self-temperature control (PTC) heating means 11 Electrical insulating layer 12 ... Examples of spacing between electrodes on heating means 13 ... PTCs with different electrical conductivity 14 ... Other examples of water passage inside heat exchanger

Claims (11)

[Claims] 1. A hot water means comprising a heat exchange means having a water inlet and a water outlet communicating with each other, a heating means, and a heating amount control means, wherein the heat exchange means moves from the water inlet to the hot water outlet.
The heating density of the heating means gradually or stepwise decreases,
A hot water means, wherein the temperature of the heating means and / or the heat exchange means is designed to be substantially equal. 2. The design according to claim 1, wherein the temperature of the hot water discharged from the hot water outlet and the temperature of the heat exchanger are designed to be substantially the same or to be maintained within a certain temperature difference. Hot water means. 3. The heating amount density is determined by an interval between electrodes.
3. The hot water means according to claim 1, further comprising a heating means having an electrode structure designed to be adjusted. 4. The hot water means according to claim 1, wherein said heating means has a self-temperature control function. 5. The heating device according to claim 1, wherein said heating means is thermally coupled to a heat exchange means via a soaking means.
The hot water means according to 1. 6. The hot water means according to claim 1, wherein the water inlet and the hot water outlet are provided adjacent to each other. 7. The hot water means according to claim 1, wherein heat storage means is thermally coupled to said heating means and heat exchange means. 8. The hot water means according to claim 7, wherein said heat storage means is a latent heat storage material. 9. A layer that is hardly adhered or easily peeled off from water scum composed of Si oxide and / or Ca carbonate is formed on at least the outermost surface of the heat exchange unit in contact with water. The hot water means according to any one of claims 1 to 8, wherein 10. The hot water means according to claim 1, wherein a pre-filter is provided upstream of said heat exchange means. 11. A local cleaning device comprising the hot water means according to claim 1, wherein: