KR20080023362A - Fluid heating device and cleaning device with the same - Google Patents

Abstract

A fluid heating device is mainly composed of a sheath heater as a heat producing body for heating fluid (water, for example), the heater having a sheath made, for example, of copper; a first case covering the sheath heater and made, for example, of copper; a flow path that is a space between the outer surface of the sheath heater and the inner surface of the first case and in which the fluid flows; a second case having an inflow opening for taking the fluid into the flow path and made, for example, of resin; and a third case having an outflow opening for taking out the heated liquid (warm water, for example) in the flow path and made, for example, of resin. In the first case, there is provided a spiral coil made, for example, of copper and spirally surrounding in the flow path the outer periphery of the sheath heater. ® KIPO & WIPO 2008

Description

Fluid heating device and cleaning device having the same {FLUID HEATING DEVICE AND CLEANING DEVICE WITH THE SAME}

The present invention relates to a fluid heating device for heating a fluid and a cleaning device having the same.

Conventionally, the human body washing | cleaning apparatus provided with the washing water heating apparatus which heats washing water is used (for example, refer patent document 1).

This human body washing device supplies washing water heated by the washing water heating device to the local part of the human body. Hereinafter, the washing water heating device included in the human body washing device described in Patent Literature 1 will be briefly described with reference to the drawings.

9 is a schematic diagram showing a washing water heating device that can be included in a conventional human body washing device.

As shown in FIG. 9, the washing water heating device includes a pipe-shaped case 103 having an inlet 101 and an outlet 102.

A sheath heater 105 is provided in the pipe-shaped case 103, and the pipe-shaped case 103 is fixed by fixing the flange 104 provided on one side of the sheath heater 105 with a screw 106. Positioning of the sheath heaters 105 in the interior is performed. In addition, the both end portions of the sheath heater 105 in the pipe-shaped case 103 are sealed by a packing 107 made of rubber or the like.

In this configuration, the washing water flows into the pipe-shaped case 103 from the inlet 101 and flows instantaneously while flowing the flow path 108 between the surface of the sheath heater 105 and the inner surface of the pipe-shaped case 103. Heated to become hot water. The hot water is discharged from the water outlet 102.

Moreover, like the washing | cleaning water heating apparatus of the said patent document 1, the human body washing | cleaning apparatus provided with the water heater which heats local washing | cleaning water conventionally is used (for example, refer patent document 2).

This human body washing apparatus supplies local washing water (hot water) heated by a water heater to the local portion of the human body. Hereinafter, the water heater included in the human body washing apparatus described in Patent Document 2 will be briefly described with reference to the drawings.

It is a schematic diagram which shows the water heater provided with the conventional human body washing apparatus.

As shown in FIG. 10, the water heater has a double tube structure composed of a cylindrical base pipe 1 and an outer cylinder 2.

The heating element 3 is provided in a part of the outer surface of the base pipe 1. Moreover, the spiral core 5 is provided in the inner hole 4 of the base material pipe 1.

In the above configuration, the water supplied into the water heater flows into the inner hole 4 of the substrate pipe 1 and flows along a plurality of threads 6 provided in the spiral core 5.

Thereby, heat exchange is performed with respect to the said water by the heat generating body 3, and the said water turns into hot water. Hot water is ejected toward the local part of the human body. Thereby, the local part of a human body is wash | cleaned.

As the water supplied into the water heater flows in a spiral shape along the plurality of threads 6 of the spiral core 5, the flow path cross-sectional area of the water decreases, so that the water flow rate increases. Thereby, since the flow of water becomes turbulent, the amount of scales of calcium components and the like contained in the water attached to the heating element 3 can be reduced.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-336203

Patent Document 2: Japanese Patent Application Laid-Open No. 2001-279786

However, the instantaneous washing water heating device described in Patent Document 1 generally has a higher power consumption than the heater used in the water-repellent human local washing device, and the temperature of the washing water heating device when heating the washing water. Becomes high temperature compared with the said heater.

And the space | interval of the pipe-shaped case 103 and the sheath heater 105 which form the flow path 108 through which washing water flows is small.

In such a configuration, for example, a control device that controls the energization of the sheath heater 105, a sensor that detects the presence or absence (flow) of the washing water, and the like are broken, and the washing water flowing inside the pipe-shaped case 103 is broken. In the absence of such a situation, there is a possibility that a situation such as a current passing through the sheath heater 105 continuously occurs. In this case, if the pipe-shaped case 103 is formed of resin, there is a risk that the pipe-shaped case 103 burns and smokes due to the heat load of the sheath heater 105.

On the other hand, when the pipe-shaped case 103 is formed of metal, the above-mentioned risk is relatively low, and the safety is high. However, in order to form the inlet 101 and the water outlet 102 in the pipe-shaped case 103, for example, Brazing or complex pipe processing techniques are required and not suitable for mass production.

In addition, in the water heater of the human body washing apparatus described in the Patent Document 2, the threads 6 and the substrate pipe 1 are close to each other because the threads 6 of the spiral core 5 and the inner surface of the substrate pipe 1 are close to each other. When there is a potential difference between them, dissimilar metal contact corrosion or gap corrosion occurs in the base pipe 1. As a result, a hole is formed in the base pipe 1, and a situation in which the washing water leaks into the hole occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid heating device with safety and a cleaning device having the same.

Another object of the present invention is to provide a fluid heating device and a cleaning device having the same while ensuring safety and improving workability.

Still another object of the present invention is to provide a fluid heating device which ensures safety and prevents leakage of fluid to the outside and a cleaning device having the same.

Means to solve the problem

(1) A fluid heating apparatus according to an embodiment of the present invention includes a heating element having a heat generating portion and a non-heating portion, and a case accommodating the heating element, the case having a fluid inlet and a fluid outlet, and a space between the heating element and the case. The flow path is formed in the case, and the case has a first structure surrounding the heat generating portion and a second structure surrounding the non-heat generating portion, and the first structure is made of a heat resistant material.

In the fluid heating device, a heating element having a heating portion and a non-heating portion is housed in the case. The fluid is introduced from the inlet of the case, and is heated by the heat generating portion of the heat generating element as the flow path formed in the space between the heat generating element and the case flows. Then, the fluid heated by the heat generating portion of the heating element flows out from the outlet of the case.

The case has a first structure surrounding the heat generating portion and a second structure surrounding the non-heat generating portion. Here, since a 1st structure consists of a heat resistant material, it becomes difficult to receive the heat load by surrounding a heat generating part. Thereby, even if the space | interval of the outer surface of a heat generating body and the inner surface of a case is small, it is prevented that a case burns and smokes by the said heat load. Thus, safety is ensured.

In addition, by forming a flow path on the outer periphery of the heating element, heat of the heating element is absorbed by the fluid flowing through the flow path. Accordingly, it is not necessary to provide a thermal monolayer for thermal insulation of the heating element outside of the case. Thereby, the fluid heating apparatus can be miniaturized.

In addition, as the heating element is covered with the fluid flowing through the flow path, the heat of the heating element is prevented from escaping to the outside. Therefore, heat exchange efficiency can be improved.

(2) The first structure may surround the heat generating portion via the flow path, and the second structure may hold the non-heat generating portion.

In this case, even if the heat generating portion is surrounded by the first structure via the flow path, the first structure is made of a heat resistant material, thereby ensuring safety. In addition, since the non-heating portion with no or no heat load is held by the second structure, the second structure can be avoided from receiving a heat load.

(3) The first structure may be made of metal or ceramics. In this case, since the first structure is made of metal or ceramics, it does not receive heat load from the heat generating portion. As a result, combustion and fuming of the first structure are prevented, and safety is ensured.

(4) The second structure may be made of resin. Since the second structure retains the non-heating portion, safety is ensured even when the second structure is made of resin.

(5) The fluid heating device may further include a heat resistant sealing material for sealing between the first structure and the second structure.

In this case, the heat-resistant seal is prevented from burning and fuming by heat from the first structure. Thus, the first structure and the second structure are sufficiently sealed by the heat resistant seal. Thus, leakage of fluid to the outside in the case is prevented.

(6) The fluid heating device may further include a heat insulating sealing material for sealing between the first structure and the second structure.

In this case, the heat insulation sealing is prevented from burning and fuming by heat from the first structure. Thereby, a 1st structure and a 2nd structure are reliably sealed by heat insulation sealing. Thus, leakage of fluid to the outside in the case is prevented.

(7) The inlet port and the outlet port may be provided in the second structure. In this case, since the second structure is made of resin, the workability of the inlet and outlet is improved.

(8) It is preferable that there is no potential difference between the heating element and the case. In this case, occurrence of dissimilar metal contact corrosion or gap corrosion due to a potential difference in the heating element and the case is prevented. As a result, safety is ensured and leakage of the fluid to the outside does not occur.

(9) The fluid heating device may further include a flow rate converting mechanism for changing the flow rate of the fluid in at least part of the flow path.

In this case, as the flow velocity of the fluid flowing through the flow path is changed by the flow rate converting mechanism, the components of the scale contained in the fluid flow down to the downstream side and the adhesion of the surface of the heating element is reduced. As a result, the life of the heating element can be extended.

In addition, as mentioned above, the component of the scale contained in a fluid is pulverized small by the change of a flow velocity in the process until it flows to a downstream side. This prevents the components of the scale from filling upstream.

In addition, by changing the flow velocity of the fluid by the flow rate converting mechanism, generation of bubbles in the fluid can be reduced. Thereby, precipitation of the component of a scale is suppressed.

In addition, by changing the flow velocity of the fluid by the flow rate converting mechanism, the surface temperature of the heat generating portion to which the fluid whose flow rate is changed is in contact can be lowered. Thereby, generation | occurrence | production of the boiling sound by the temperature of a heat generating part raises can be prevented.

(10) It is preferable that there is no potential difference between the flow rate converting mechanism and the heating element. This prevents the occurrence of dissimilar metal contact corrosion or gap corrosion in the flow rate conversion mechanism and the heating element. Thereby, insulation deterioration of a heat generating body can be prevented.

(11) The flow rate converting mechanism may have a potential lower than that of the heating element. In this case, corrosion occurs in the flow rate conversion mechanism having a low potential. As a result, corrosion does not occur in the heating element, and insulation degradation of the heating element can be prevented.

(12) It is preferable that there is no potential difference between the flow rate converting mechanism and the case. In this case, the generation of dissimilar metal contact corrosion or gap corrosion due to the potential difference in the flow rate conversion mechanism and the case is prevented. Accordingly, safety is ensured and leakage of the fluid to the outside does not occur.

(13) The flow rate converting mechanism may have a lower potential than the case. In this case, corrosion occurs in the flow rate conversion mechanism having a low potential. As a result, no corrosion occurs in the case. Thus, leakage of fluid from the inside of the case to the outside is prevented.

(14) The fluid heating device may further include a power supply device that supplies electric power to the heating element so that the fluid is heated to a predetermined temperature by the heating element while the fluid flows from the inlet to the outlet.

In this case, electric power is supplied to the heating element by the power supply so that the fluid is heated to a predetermined temperature by the heating element while the fluid flows from the inlet to the outlet. As a result, the fluid is heated to a predetermined temperature by the heating element in a short time flowing from the inlet to the outlet.

By such a configuration, an instantaneous fluid heating device can be realized. Therefore, the amount of fluid required when needed can be heated instantaneously with little energy loss.

In addition, since the instantaneous fluid heating device requires a large power, the insulation resistance of the heating element is required. Even in such a case, as described above, since the insulation resistance of the heating element due to corrosion can be prevented from deteriorating, safety can be ensured.

(15) A cleaning device according to another embodiment of the present invention is a cleaning device that ejects a fluid supplied from a water supply source to a body of a human body, and includes a fluid heating device for heating a fluid supplied from a water supply source, and a fluid heating device. And a ejecting device for ejecting the heated fluid to the human body, wherein the fluid heating device includes a heating element having a heat generating portion and a non-heating portion, a case accommodating the heating element, and a case having an inlet of the fluid and an outlet of the fluid. A flow path is formed in the space between the cases, and the case has a first structure surrounding the heat generating portion and a second structure surrounding the non-heat generating portion, and the first structure is made of a heat resistant material.

In the cleaning device, the fluid supplied from the water supply source is heated by the fluid heating device, and the heated fluid is jetted to the human body by the jet device. As a result, the human body is cleaned.

In the fluid heating apparatus used for this washing | cleaning apparatus, while safety is ensured, miniaturization is possible and heat exchange efficiency is improved. Therefore, a stable heat exchange can be performed for a long time in the washing apparatus, and at the same time, the washing apparatus can be downsized.

(16) A cleaning device according to still another embodiment of the present invention is a cleaning device for cleaning a cleaning object using a fluid supplied from a water supply source, the cleaning device containing a cleaning object and a fluid supplied from the water supply source. A fluid heating device and a supply device for supplying a fluid heated by the fluid heating device into the cleaning tank, the fluid heating device containing a heating element having a heat generating portion and a non-heating portion, a heating element, and containing an inlet and a fluid of the fluid. A case having an outlet, a flow path is formed in a space between the heat generating element and the case, the case having a first structure surrounding the heat generating portion and a second structure surrounding the non-heat generating portion, wherein the first structure is made of a heat resistant material. will be.

In this cleaning device, the fluid supplied from the water supply source is heated by the fluid heating device, and the heated fluid is supplied into the cleaning tank by the supply device. Thereby, the washing | cleaning object in a washing tank is wash | cleaned.

In the fluid heating apparatus used for this washing apparatus, safety is ensured, miniaturization is possible, and heat exchange efficiency is improved. Therefore, a stable heat exchange can be performed for a long time in the washing apparatus, and at the same time, the washing apparatus can be downsized.

Effects of the Invention

According to the present invention, safety of the fluid heating device and the cleaning device is ensured. In addition, the workability of the fluid heating device is improved. In addition, leakage of fluid to the outside in the case of the fluid heating device is prevented.

1 is a cross-sectional view showing a fluid heating device according to a first embodiment;

2 is a cross-sectional view taken along the line A-A of the fluid heating device of FIG.

3 is a schematic diagram showing a flow rate distribution in a fluid heating device when the flow rate of a fluid is low;

4 is a schematic diagram showing the flow rate distribution in the fluid heating device when the flow rate of the fluid is high;

5 is a schematic cross-sectional view of the sanitary washing apparatus according to the second embodiment;

6 is a schematic cross-sectional view of the garment washing apparatus (washing machine) according to the third embodiment;

7 is a cross-sectional view taken along line B-B of the clothes cleaning apparatus of FIG.

8 is a schematic sectional view of the dish washing apparatus according to the fourth embodiment;

9 is a schematic diagram showing a washing water heating device provided in a conventional human local washing device;

10 is a schematic diagram showing a water heater provided in a conventional human body washing apparatus.

EMBODIMENT OF THE INVENTION Hereinafter, the fluid heating apparatus which concerns on one Embodiment of this invention, and the washing | cleaning apparatus provided with this are demonstrated, referring drawings.

(1) First embodiment

1 is a cross-sectional view showing a fluid heating device according to a first embodiment.

As shown in FIG. 1, the fluid heating device 54 is mainly composed of a sheath heater 7 which is a heating element for heating a fluid (for example, water), for example, metal (copper in the present embodiment) or ceramics. It consists of the case member 8 which consists of cases, the case member 11 which consists of resin, for example, and the case member 13 which consists of resin, for example.

The case member 8 is provided so as to surround the sheath heater 7. A flow path 9 is formed by the space between the outer surface of the sheath heater 7 and the inner surface of the case member 8, through which the fluid flows. The case member 11 has an inlet 10 for introducing a fluid into the flow path 9. The case member 13 has an outlet 12 for taking out the heated fluid (for example, hot water) in the flow path 9. The case member 8, the case member 11, and the case member 13 constitute the case 100.

The case member 8 and the case member 11 are connected via an O-ring 14 for sealing, and the case member 8 and the case member 13 are likewise connected via an O-ring 15 for sealing. .

In addition, the sheath heater 7 and the case member 11 are connected via an O-ring 16 for sealing, and the sheath heater 7 and the case member 13 are connected via an O-ring 17 for sealing. do.

In the case member 8, for example, a spiral coil 18 made of copper is provided to surround the outer circumference of the sheath heater 7 in a spiral shape in the flow path 9.

Here, the spiral member fixing groove 40 is provided in the case member 11. The spiral coil 18 is held by inserting one end of the spiral coil 18 into the spiral coil fixing groove 40 and inserting the case member 8 into the case member 11 to assemble it. With such a configuration, the catching and rotation prevention of the spiral coil 18 in the flow path 9 can be reliably performed.

In addition, in order to fix the fluid heating apparatus 54 to a predetermined position, the case member 11 and the case member 13 are provided with the main body attaching part 41 and the main body attaching part 42, respectively.

The sheath heater 7 is comprised in the rod shape which has a circular cross section. In the present embodiment, a sheath 19 made of a copper tube having excellent thermal conductivity is used for the sheath heater 7, but is not limited thereto, and a sheath made of stainless steel or the like having high corrosion resistance depending on the type of fluid is used. You may also do it.

The sheath heater 7 is provided with the heat generating part 20 provided in the sheath 19, and the non-heating parts 27 and 28 provided in each end in the sheath 19 (a net hook part of FIG. 1). The heat generating portion 20 is constituted by a heater wire made of nickel-chromium or the like.

The non-heating portions 27 and 28 have energizing terminals 21 and 22 therein, respectively. Since these electricity supply terminals 21 and 22 have a small electrical resistance, they hardly generate heat even if a current is supplied. The heat generating portion 20 and the electricity supply terminals 21 and 22 are electrically connected to each other.

The magnesium oxide powder of the insulator is filled with high density around the heat generating portion 20, and the heat of the heat generating portion 20 is conducted to the sheath 19 via the magnesium oxide. By this structure, the fluid flowing through the surface of the sheath 19 is heated.

The o-rings 14, 15, 16, and 17 have a role as a sealing material for preventing the fluid flowing in the case members 11, 8, 13 from leaking to the outside.

On the inlet 10 side of the fluid, the O-ring 14 is sandwiched between the case member 8 and the case member 11 made of a copper tube obtained by flanging, for example. In this state, the pressing plate 23 is fixed to the case member 11 by screws or the like, thereby improving the adhesion between the case member 8 and the case member 11 via the O-ring 14. This configuration prevents the fluid from leaking from the inside of the case members 8 and 11 to the outside.

In addition, the O-ring 16 is sandwiched between the sheath 19 and the case member 11. In this state, the pressing plate 24 is fixed to the case member 11 with a screw or the like to improve the adhesion between the sheath 19 and the case member 11 via the O-ring 16. This configuration prevents the fluid from leaking from the inside of the case member 11 to the outside.

On the other hand, on the outlet 12 side of the fluid, the O-ring 15 is sandwiched between the case member 8 and the case member 13. In this state, the pressing plate 25 is fixed to the case member 13 with a screw or the like to improve the adhesion between the case member 8 and the case member 11 via the O-ring 15. This configuration prevents the fluid from leaking from the inside of the case members 8 and 13 to the outside.

In addition, the O-ring 17 is sandwiched between the sheath 19 and the case member 13. In this state, the pressing plate 26 is fixed to the case member 13 with a screw or the like to improve the adhesion between the sheath 19 and the case member 13 via the O-ring 17. This configuration prevents the fluid from leaking from the inside of the case member 13 to the outside.

In addition to the role of preventing the fluid from leaking from the inside of the case members 11, 8, and 13 to the outside, the O-rings 16 and 17 also serve to hold the sheath heater 7.

That is, the O-ring 16 is in contact with the outer circumference of the non-heat generating portion 27 at one end of the sheath heater 7 as the O-ring 16 is fitted by the pressing plate 23 and the case member 11. On the other hand, as the O-ring 17 is fitted by the pressing plate 26 and the case member 13, the O-ring 17 contacts the outer circumference of the non-heat generating portion 28 at the other end of the sheath heater 7. As a result, the sheath heater 7 is held in the case members 11, 8, 13.

The fluid heating device 54 is provided with a triac 30 which is a power control element for controlling the sheath heater 7 and a heat generating electronic component.

Here, the heat transfer plate 29 obtained by bending the copper plate is fixed by screws or the like so as to closely adhere to a part of the outer circumference of the case member 8. Then, the triac 30 is strongly fixed to the heat transfer plate 29 by a screw or the like so that heat conduction is sufficiently possible.

In addition, the thermal fuse 31, which is a thermal transfer prevention means for interrupting the energization of the sheath heater 7 at the time of abnormal temperature overheating, is provided so that the outer periphery of the heat transfer plate 29 and a part of the case member 8 is sufficiently in contact with each other. It is provided between the outer periphery of the board 29 and a part of the case member 8. Moreover, one connection part of the thermal fuse 31 is electrically connected to the electricity supply terminal 21 by a conducting wire, and the other connection part of the thermal fuse 31 is connected to one connection part of the triac 30 by a conducting wire. Electrically connected.

A thermistor 32 for detecting the temperature of the fluid is attached to the outlet 12 of the case member 13. In addition, the fluid heating device 54 is provided with a controller 33 for controlling each component of the fluid heating device 54. The other connection part of the triac 30 is electrically connected to the controller 33 by conducting wire. Thermistor 32 is electrically connected to the controller 33 by conducting wire.

In addition, even when an electric failure occurs in the thermistor 32 or the controller 33, the thermostat 34 of the temperature switch is provided with a case member 13 so as to prevent the fluid temperature from becoming excessively high. Is provided in the vicinity of the outlet 12.

One connection part of the thermostat 34 is electrically connected to the controller 33 by the conducting wire, and the other connection part of the thermostat 34 is electrically connected to the electricity supply terminal 22 by the conducting wire.

In such a configuration, when the thermistor 32 or the controller 33 has an electrical failure, the electrical contact in the thermostat 34 is mechanically changed so that the power supply to the energization terminal 22 is stopped at a predetermined temperature. do.

Hereinafter, the operation and action of the fluid heating device 54 configured as described above will be described.

Initially, when fluid flows in from the inlet 10, the controller 33 begins to energize the sheath heater 7 via the triac 30.

Thereafter, heat exchange is performed between the fluid flowing through the flow path 9 formed between the sheath heater 7 and the case member 8 and the sheath heater 7, and the fluid heated to a predetermined temperature flows out of the outlet 12. do.

When the heated fluid flows out of the outlet 12, the temperature of the fluid flowing out of the outlet 12 is detected by the thermistor 32. The temperature detected by the thermistor 32 is given to the controller 33 as a detection signal.

The controller 33 controls the power supply to the sheath heater 7 via the triac 30 based on the detection signal from the thermistor 32, whereby the temperature of the fluid flowing out of the outlet 12 is predetermined. Allow temperature.

In this way, when the power of the sheath heater 7 is controlled by the triac 30, the triac 30 also generates heat. Therefore, in order to prevent damage by heat generation, it is necessary to cool the triac 30.

In this embodiment, as described above, the triac 30 is strongly fixed to the heat transfer plate 29 by screws or the like, so that the heat of the triac 30 is conducted to the heat transfer plate 29. Heat conducted to the heat conduction plate 29 is discharged to the fluid flowing in the case member 8 via the case member 8.

Moreover, the thermostat 34 is provided in the vicinity of the outlet 12 of the case member 13, and even when an electrical failure occurs in the thermistor 32 or the controller 33 at any abnormality, the temperature of the heated fluid Is exceeded the predetermined temperature, the electricity supply to the sheath heater 7 is cut off. This prevents the temperature of the fluid from becoming excessively high.

In addition, when the thermal fuse 31 is provided between the case member 8 and the heat transfer plate 29, the thermistor 32 or the controller 33 breaks down, and the thermostat 34 also breaks down. Even if the temperature of the heated fluid exceeds a predetermined temperature, the electricity supply to the sheath heater 7 is cut off by the thermal fuse 31 via the electricity supply terminal 21.

Here, when there is no fluid in the case members 11, 8 and 13 (when heat is applied without fluid), since the heat of the sheath heater 7 is not absorbed by the fluid, the sheath heater 7 is in this state. ), The energization of the heat generating portion 20 continues, the increase in the temperature of the heat generating portion 20 and the sheath 19 is significantly accelerated. In the above state, if the energization to the heat generating unit 20 is further continued, the temperature of the heat generating unit 20 exceeds the boiling temperature of the fluid (for example, water) 100 ℃, the heat generating unit 20 is in a red state Can also be

In the present embodiment, as described above, a portion of the sheath heater 7 facing the heat generating portion 20 is formed by the case member 8 made of a heat-resistant material, whereby heat is applied without the fluid as described above. Radiant heat from the heat generating part 20 and the sheath heater 7 which become the highest temperature heat the inner peripheral surface of the case member 8.

The heat of the inner circumferential surface of the case member 8 is conducted to the temperature fuse 31 and the heat transfer plate 29 provided in close contact with the outer circumferential surface of the case member 8. Then, the temperature fuse 31 is melted and blown at a temperature at which safety is considered, and the energization to the sheath heater 7 is cut off.

Here, if the case member 8 is made of a resin and heat is applied without fluid, there is a possibility that smoke may be emitted from the case member 8 due to the high-temperature radiant heat of the sheath heater 7. Moreover, since resin has low thermal conductivity, even if the sheath heater 7 is high temperature, the thermal fuse 31 does not melt | dissolve. In addition, when the electricity supply to the sheath heater 7 continues, a hole may arise in the said case member 8 by melt | dissolution of the case member 8.

In the present embodiment, as described above, the structure is made of a plurality of materials of the case members 11, 8, 13. The case member 8 subjected to heat load is made of a metal having high heat resistance (copper in the present embodiment), and the case members 11 and 13 which do not receive much heat load are made of resin. Thus, by considering the heat load and providing the selectivity of the material to be constituted, it is possible to improve both thermal safety and workability.

In addition, the temperature of the sheath 19 in the region facing the non-heating portions 27 and 28 is lower than the temperature of the sheath 19 in the region facing the heat generating portion 20. Therefore, even when the case members 11 and 13 are used to hold the non-heating portions 27 and 28, respectively, the temperature of the case members 11 and 13 does not exceed the heat resistance temperature of the resin. This prevents the case members 11 and 13 from burning and fuming.

In addition, in this embodiment, the O-rings 14 and 15 consist of fluororubber, for example, and the heat resistance temperature is about 200 degreeC. Fluorine rubber has a heat resistance temperature about twice that of the nitrile rubber or ethylene propylene rubber.

Thus, by constructing the O-rings 14 and 15 with a heat-resistant sealing material having a heat-resistant temperature of about 200 ° C., even when the case member 8 has a high temperature, the sealing property can be reliably maintained and the outside of the fluid Leakage can be reliably prevented.

Similarly, since the O-rings 16 and 17 are each made of fluorine rubber, the high temperature at both ends of the sheath 19 until the thermal fuse 31 melts and is blown when the heat is applied without fluid. Even when heat conducts to the O-rings 16 and 17, the sealing property can be reliably maintained and the external leakage of the fluid can be reliably prevented.

In addition, the O-rings 14, 15, 16, and 17 have a lower thermal conductivity than metals, and also have a function as a heat insulating material having excellent heat insulating properties.

That is, even when the sheath 19 and the case member 8 become high temperature, heat conduction from the sheath 19 and the case member 8 to the case members 11 and 13 can be suppressed. As a result, when the case members 11 and 13 become high temperature, damage, such as softening or sticking, is prevented from occurring. As a result, the sealing property can be reliably maintained, and the external leakage of the fluid can be reliably prevented.

In addition, even when the sheath heater 7 expands and contracts in the axial direction and the radial direction due to temperature change, the expansion and contraction are absorbed by the elastic deformation of the O-rings 16 and 17 and the sealing property is assured. Is maintained.

In particular, even when the expansion and contraction in the axial direction of the sheath heater 7 due to the temperature change is large, the sheath heater 7 is slidably held in the axial direction by the O-rings 16 and 17, so that the sheath heater Tensile stress and compressive stress do not occur in the 7 and the case members 11 and 13. As a result, excellent durability reliability is ensured against continuous repetition of expansion and contraction of the sheath heater 7 due to temperature change.

In the present embodiment, in the above-described configuration in which the sheath heater 7 is slidably held in the axial direction by the O-rings 16 and 17, the sheath heater 7 is displaced in the axial direction by repeating expansion and contraction. In order to prevent that, some of the press plates 23 and 26 are curved in a U-shape, respectively, and the stoppers 35 and 36 are formed.

With this structure, even if the sheath heater 7 is displaced in the axial direction, the sheath heater 7 is not greatly displaced by contacting the stoppers 35 and 36. As a result, the sheath heater 7 is prevented from falling out and mechanical stress is not generated in the sheath heater 7 and the case members 11 and 13.

Here, by brazing flanges at both ends of the sheath heater 7, when the sheath heater 7 is fixed to the case members 11 and 13, the dimensional change due to expansion and contraction of the sheath heater 7 is elastic. It is not absorbed, and mechanical stress repeatedly acts on the brazed area, and there is a possibility of cracking.

However, in the case where the sheath heater 7 is configured to be slidable in the axial direction by the O-rings 16 and 17 as in the present embodiment, the effect of preventing the occurrence of cracking and the case members 11 and 13 It has an inhibitory effect on heat conduction.

In addition, since the case members 11 and 13 are made of resin, the case members 11 and 13 can be easily formed by a molding process such as injection molding even when the case members 11 and 13 have a complicated shape. Can be formed.

And the inlet 10 and the outlet 12 can be easily provided in the case members 11 and 13, respectively, and the thermistor 32 and the thermostat 34 are integrated in the case member 13, respectively. You can arrange. This makes it possible to compact the fluid heating device 54.

Moreover, when the case members 11 and 13 are comprised with resin, the effect shown below is also acquired.

2 is a cross-sectional view taken along the line A-A of the fluid heating device 54 of FIG. In addition, although the structure of the case member 11 and its effect are demonstrated below, the same effect can also be acquired also in the case member 13.

As shown in FIG. 2, the inlet port 10 is provided to be eccentric from the shaft center of the sheath heater 7 or the case member 8. As a result, the fluid flows while turning the surface of the sheath heater 7 (the sheath 19). This prevents the components of the scale from adhering to the sheath heater 7 and the case member 8.

Thus, even if it is necessary to form the case member 11 in a complicated shape in order to prevent adhesion of the components of the scale, the case member 11 can be easily formed into a desired shape by using a resin. . Moreover, by using resin, it can also be formed so that the flow path cross-sectional area of the inflow port 10 may change smoothly. As a result, the pressure loss is reduced.

In addition, it is easy to form detailed structures, such as the spiral coil fixing groove 40 and the main body attachment part 41, using resin. In particular, the spiral coil fixing groove 40 and the main body attaching portion 41 may be changed in shape depending on the installation situation, and the precise shape according to the installation situation is easily processed by resin.

Here, when the spiral coil 18 does not exist, a cylindrical flow passage (donut flow passage) is formed between the inner circumferential surface of the case member 8 and the outer circumferential surface of the sheath heater 7. In this case, the fluid flowing into the case member 8 flows along the cylindrical flow path along the axial direction of the sheath heater 7.

In the present embodiment, the flow path cross-sectional area (area of the cross section perpendicular to the direction of swirl flow) of the spiral flow path 9 is smaller than the flow path cross-sectional area of the cylindrical flow path (area of the cross section perpendicular to the axial direction of the sheath heater 7). The winding direction and pitch P (FIG. 1) of the spiral coil 18 are set so that it may become small.

As a result, the fluid flowing in the spiral shape is accelerated along the spiral coil 18, and the flow rate of the fluid flowing in the flow path 9 becomes higher than in the case where the spiral coil 18 does not exist. Thus, the spiral coil 18 of this embodiment functions as a flow rate conversion mechanism which raises the flow velocity of a fluid, and also functions as a direction conversion mechanism which converts the direction of a fluid flow to a turning direction. The apparent flow path cross-sectional area is represented by the product of the gap between the sheath heater 7 and the case member 8 and the pitch P of the spiral coil 18.

In addition, turbulence occurs because the flow velocity of the fluid flowing through the flow path 9 becomes high. Thus, the spiral coil 18 of the present embodiment also functions as a turbulence generating mechanism that generates turbulence.

In addition, the term "turbulence" is a generic term that refers to a confusion of a flow including a direction change or a flow rate change.

For example, when the outer diameter of the sheath heater 7 is 6.5 mm in diameter, the inner diameter of the case member 8 is 9 mm in diameter, and the pitch of the spiral coil 18 is 6 mm, the spiral coil 18 is not present. While the flow path cross section is about 300 mm ² , the apparent flow path cross section when the spiral coil 18 is present is about 7.5 mm ² .

Therefore, when the fluid is flowed at the same flow rate, when the spiral coil 18 is present, the flow rate can be approximately four times that when the spiral coil 18 is not present. In addition, since the flow of the fluid is a swirl flow, the increase in pressure loss is relatively small even if the flow path cross-sectional area is small.

When the spiral coil 18 does not exist, the cylindrical flow path surrounded by the case member 8 and the sheath heater 7 has a flow path cross section with a large aspect ratio. In this case, the fluid flowing from the inlet 10 provided at a position eccentric from the central axis of the case member 8 initially flows in a spiral shape along the outer circumferential surface of the sheath heater 7, but gradually rectifies the effect. , The flow component in the turning direction is lost, and the flow component in the axial direction becomes the main body. As a result, the flow velocity of the fluid is substantially lowered in the region on the downstream side near the outlet port 12.

On the other hand, in this embodiment, the spiral coil 18 forms the spiral flow path 9. Accordingly, the swirl flow in the turbulent state which always deflects and has a high flow rate is continued, and the thickness of the boundary layer of the flow rate between the sheath 19 and the fluid of the sheath heater 7 becomes very thin.

FIG. 3 shows the flow rate distribution in the fluid heating device 54 when the flow rate of the fluid is low, and FIG. 4 shows the flow rate distribution in the fluid heating device 54 when the flow rate of the fluid is high.

As shown in FIG. 3, when the flow velocity of the fluid is low, the thickness of the boundary layer 37 of the flow velocity between the fluid and the sheath 19 increases. As a result, the heat of the sheath 19 is not efficiently transferred to the whole of the fluid.

In contrast, when the flow velocity of the fluid is high and the flow of the fluid becomes turbulent, as shown in FIG. 4, the thickness of the boundary layer 38 of the flow velocity between the fluid and the sheath 19 becomes small. As a result, heat from the sheath 19 is efficiently transferred to the entirety of the fluid. As a result, excessive increase in the surface temperature of the sheath 19 is prevented.

Generally, the higher the temperature, the larger the amount of precipitation on the scale. Therefore, as in the present embodiment, when the flow velocity of the fluid in the spiral flow path 9 increases, the thickness of the boundary layer 38 of the flow velocity between the fluid and the sheath 19 decreases, so that the sheath 19 It is possible to suppress an increase in the surface temperature of the film, and as a result, the precipitation of the scale on the sheath 19 can be prevented, or the amount of scale components deposited on the sheath 19 can be reduced.

Even if the scale is deposited, for example, the scale has a high flow rate and flows downstream by rapid flow while being smallly crushed by the turbulent fluid. As a result, the scale becomes difficult to adhere to the fluid heating device 54, and the downstream of the fluid heating device 54 does not become full. Further, the scale attached in the fluid heating device 54 has a high flow rate and is peeled off by the fluid in turbulent state. Thus, the spiral coil 18 of this embodiment also functions as an impurity removal mechanism. As a result, the life of the fluid heating device 54 can be extended.

In addition, since a smooth spiral flow is formed, the pressure loss in the spiral flow path 9 can be reduced while having a high flow velocity. As a result, heat exchange efficiency can be improved and the fluid heating device 54 can be miniaturized.

Moreover, since heat insulation is performed by the spiral flow path 9 formed in the outer periphery of the sheath heater 7, it is not necessary to provide a thermal insulation layer. Therefore, the fluid heating device 54 can be further miniaturized. In addition, the heat of the sheath heater 7 is prevented from running to the outside by the spiral flow path 9 formed on the outer circumference of the sheath heater 7. Therefore, heat exchange efficiency can be improved further.

In addition, in the fluid heating device 54 according to the present embodiment, not only adhesion of the scale but also adhesion of other impurities such as scale or dust can be similarly prevented or reduced. In the following descriptions, the scale is taken as a representative impurity. Explain.

In addition, since the fluid has a high flow rate, the generation of bubbles is reduced, and the surface temperature of the sheath 19 of the sheath heater 7 is suppressed low, so that the generation of boiling sounds can be reduced.

In the present embodiment, in order to increase the effect of reducing the scale, the flow velocity of the fluid is increased until the flow of the fluid becomes turbulent by the spiral coil 18 functioning as the flow rate converting mechanism, the direct flow converting mechanism, and the turbulence generating mechanism. Even if the flow of the fluid is in the laminar flow state, by increasing the flow velocity of the fluid by the spiral coil 18, the thickness of the boundary layer 38 of the flow velocity between the fluid and the sheath 19 can be reduced. Thereby, the effect of reducing a scale can be obtained.

In addition, the spiral coil 18 is formed by a member separate from the sheath heater 7 and the case member 8, and is not completely fixed to the sheath 19 or the case member 8 of the sheath heater 7. .

In this case, a part of the spiral coil 18 is kept in a vibrable state. Thereby, the spiral coil 18 can vibrate by the force and elasticity which are received from the flow of a fluid, and the effect of preventing or reducing scale attachment, and the effect of peeling off a scale can be obtained.

In addition, the spiral coil 18 of the other member can be easily removed from the fluid heating device 54. For this reason, when using the fluid heating device 54 in the area with few scale components in a fluid (tap water), or the area with low water pressure, the spiral coil 18 of a separate member is removed and the shape of the spiral coil 18 is removed. The pressure loss can be changed so as to reduce the pressure loss, or the spiral coil 18 can be attached to the location where the flow rate is lowered into the fluid heating device 54. As a result, the pressure loss in the fluid heating device 54 is lowered, and the flow velocity is higher. As a result, adhesion of the scale can be sufficiently prevented or reduced. In addition, since the spiral coil 18 can be easily replaced at the time of abnormality, maintainability improves.

In addition, in this embodiment, although the pitch P (FIG. 1) of the spiral coil 18 is constant, the pitch P of the spiral coil 18 is partially narrowed or wider, or the pitch P of the spiral coil 18 ( You may change P) gradually. Even in this case, the spiral coil 18 functions as a flow rate converting mechanism, a direct flow converting mechanism, a turbulence generating mechanism, and an impurity removing mechanism, and can prevent or reduce adhesion of the scale.

In addition, although the spiral coil 18 is provided in the whole flow path 9 in this embodiment, the spiral coil 18 may be provided in a part of the flow path 9. Even in this case, the spiral coil 18 functions as a flow rate converting mechanism, a direct flow converting mechanism, a turbulence generating mechanism, and an impurity removing mechanism, and can prevent or reduce adhesion of scale.

In addition, in this embodiment, although the spiral coil 18 of a spiral shape is used as a flow rate conversion mechanism, a direction conversion mechanism, a turbulence generation mechanism, and an impurity removal mechanism, it is not limited to this, It has other shapes, such as a confusion promoting wing or guide. The member may realize a flow rate converting mechanism, a direct flow converting mechanism, a turbulence generating mechanism, and an impurity removing mechanism. Even in such a case, the effect of preventing or reducing scale adhesion can be obtained.

Here, in the fluid heating device 54 according to the present embodiment, as described above, the sheath 19, the spiral coil 18, and the case member 8 of the sheath heater 7 are made of copper. Hereinafter, this effect is demonstrated.

When the gap between the sheath heater 7 (sheath 19) and the spiral coil 18 or between the case member 8 and the spiral coil 18 is large, the fluid flowing in the flow path 9 is spiraled. The flow component in the cylindrical axial direction becomes the main body without flowing along the coil 18, and effects such as reduction in scale adhesion cannot be obtained. For this reason, it is necessary to arrange | position the sheath heater 7, the spiral coil 18, and the case member 8 and the spiral coil 18, respectively.

However, when the parts are arranged in close proximity to each other, corrosion (hereinafter referred to as potential corrosion) occurs due to a potential difference such as dissimilar metal contact corrosion or gap corrosion between the parts. As a result, as the hole is formed in the case member 8, external leakage of the fluid occurs, and as the hole is formed in the sheath 19, insulation deterioration or the like is likely to occur.

Thereby, in this embodiment, the sheath 19, the spiral coil 18, and the case member 8 are comprised by copper, respectively, and the potential difference between each component is eliminated. This can prevent the occurrence of dislocation corrosion such as dissimilar metal contact corrosion or gap corrosion. As a result, the life of the fluid heating device 54 can be extended.

In addition, in this embodiment, although the material which comprises the sheath 19, the spiral coil 18, and the case member 8 was made into copper which is excellent in thermal conductivity and excellent in low cost and workability, it is limited to this. Instead, other materials may be used depending on the fluid to be used or the performance required for the fluid heating device 54. For example, strength can be improved by using stainless steel, and weight reduction can be achieved by using aluminum. Even in this case, a potential difference does not occur between the parts, and the life of the fluid heating device 54 can be extended.

In addition, when the material which comprises the sheath 19, the spiral coil 18, and the case member 8 needs to be changed between each said component, copper (for example, the copper electric potential in seawater is -1.36V) And a material having a small potential difference between them, such as a combination of stainless steel (potential of SUS304 in seawater is -0.08V). As a result, dislocation corrosion hardly occurs, and the lifetime of the fluid heating device 54 is also long.

On the other hand, when it is necessary to use a combination of materials so that the potential difference of each component becomes large, the material which comprises the spiral coil 18 is made into the material (metal material) whose potential is lower than the sheath 19 and the case member 8. It is desirable to. This is because dislocation corrosion occurs in the component on the lower side.

For example, the sheath 19 and the case member 8 are made of copper (standard electrode potential +0.34 V) excellent in thermal conductivity, and the spiral coil 18 is excellent in workability and low-cost iron (standard electrode potential − 0.44V), dislocation corrosion occurs as the spiral coil 18 made of iron having a low dislocation. Therefore, it is possible to prevent the external leakage of the fluid and the degradation of the insulation due to the occurrence of dislocation corrosion on the sheath 19 and the case member 8.

It is not necessary to provide the spiral coil 18 when the adhesion of the scale is not large, such as when the temperature of the fluid is low, or when the scale concentration in the fluid used is low.

In this case, the fluid flows in the cylindrical axial flow path 9 formed between the inner circumferential surface of the case member 8 and the outer circumferential surface of the sheath 19. Even in such a case, the sheath 19 and the case member 8 are made of a material having a small potential difference between them, preferably a material having no potential difference, thereby preventing external leakage of the fluid and insulation degradation due to potential corrosion. Can be.

In addition, since the press plates 23, 24, 25, and 26 are comprised by the O-rings 14, 15, 16, and 17 so that they may not contact the fluid which flows in the flow path 9, the sheath 19 and the case member ( 8) There is no potential corrosion between them. Therefore, the material of the press plates 23, 24, 25, and 26 does not need to be specifically determined. However, when there is a possibility that water droplets may adhere between the pressing plates 23, 24, 25, and 26 and the sheath 19 or the case member 8, for example, when used in a place with high humidity, the sheath 19 and the case The press plates 23, 24, 25, and 26 are preferably made of a material having a small potential difference from the member 8, preferably a material such as the sheath 19 and the case member 8.

In addition, since the case members 11 and 13 are configured to be close to the sheath 19 and the case member 8, the case members 11 and 13 are in contact with the fluid flowing in the flow path 9. By constructing 13 from resin, dislocation corrosion does not occur between the sheath 19 and the case member 8. When the case members 11 and 13 are made of a metal material, the case members 11 and 13 and the sheath 19 and the case member 8 are made of a metal material having a small potential difference between them, preferably the same. By using the metal material, it is possible to prevent external leakage of the fluid and insulation deterioration due to potential corrosion.

In addition, even when the case member 8 is constituted by a combination of a plurality of components made of a metal material, the components due to potential corrosion may be formed by configuring each of the components with a metal material having a low potential difference, preferably the same metal material. External leakage and insulation deterioration can be prevented. In addition, the case where the case members 11 and 13 are comprised by the combination of several components which consist of a metal material is the same as the above.

Thus, by configuring each component of the sheath 19, the spiral coil 18, and the case member 8 by copper, it becomes possible to eliminate the potential difference between each component. As a result, it is possible to prevent external leakage of fluid due to opening of the case member 8 due to dislocation corrosion such as dissimilar metal contact corrosion or gap corrosion, and insulation deterioration due to opening of the sheath 19. . Accordingly, the life of the fluid heating device 54 can be extended.

(2) 2nd Embodiment

5 is a schematic cross-sectional view of the sanitary washing apparatus according to the second embodiment. As the sanitary washing apparatus, the fluid heating apparatus 54 according to the first embodiment can be adopted.

The sanitary washing apparatus 100 of FIG. 5 includes a main body portion 53 and a heating toilet 52. The main body 53 and the heating toilet 52 are mounted on the toilet 51.

The fluid heating device 54, the shutoff valve 57, and the flow rate control device 58 are provided as main parts in the main body part 53. Other components, such as a control board built in the main body 53, are omitted.

Fluid heated by the fluid heating device 54 (hereinafter referred to as hot water) is ejected from the human body cleaning nozzle 55. Thus, the local part of the human body 56 is cleaned.

In such a sanitary washing apparatus 100, when a user is seated on the heating toilet 52, the shutoff valve 57 is opened, and tap water as a fluid is introduced into the fluid heating apparatus 54. As shown in FIG.

When the user presses a washing button of a remote control device (not shown), the tap water is heated by the fluid heating device 54 to a predetermined predetermined temperature (user's desired temperature) to generate hot water. Then, the flow rate of the hot water is controlled by the flow rate control device 58 so that the flow rate is set in advance, and the hot water of the predetermined flow rate is ejected toward the local part of the human body 56 by the human body washing nozzle 55. In this way, the fluid heating device 54 according to the present embodiment functions as an instantaneous fluid heating device capable of instantaneously heating tap water when the user wants to wash the local part with hot water.

Here, the conventional sanitary washing apparatus has a hot water tank capable of storing about 1 liter of hot water instead of the instantaneous type as described above, and keeps the hot water in the hot water tank at about 40 ° C at all times by a heater. It was common for the scooped thing to be.

However, in the conventional low-water type sanitary washing apparatus, the hot water in the hot water tank is always kept at about 40 ° C., and there is a heat radiation loss from the hot water tank, thereby providing the instantaneous fluid heating device 54. About twice as much power is needed. As a result, energy efficiency could not be realized.

In addition, when the storage amount of a hot water tank is 1 liter, when hot water is used for about 1 minute, the hot water in the said hot water tank will disappear. In addition, since the volume of the hot water tank is large, the compactness of the sanitary washing apparatus could not be realized.

In the sanitary washing apparatus 100 employing the fluid heating device 54 of the present embodiment, since the tap water is heated by the sheath heater 7 instantaneously, the hot water can be prevented from running short, and the user can continuously By doing so, the desired time can be cleaned, and energy efficiency with little heat dissipation loss can be achieved.

In addition, in the sanitary washing apparatus 100 of the present embodiment, a large hot water tank such as that used for a low temperature sanitary washing apparatus is unnecessary. Therefore, the sanitary washing apparatus 100 can be made compact.

However, when the instantaneous fluid heating device 54 is adopted in the sanitary washing apparatus 100, the rated power (number of watts) of the sheath heater 7 is not set to be larger than the rated power of the water heater. There is no way.

In this way, since the rated power of the sheath heater 7 is large, it may occur that the rated power is continuously supplied to the sheath heater 7 or a state in which heat is applied without fluid due to a failure caused by any abnormality. As also mentioned in the first embodiment, safety in such a case is sufficiently secured.

In the present embodiment, the body portion 53 can be miniaturized by incorporating the fluid heating device 54 which is small in size and prevents or reduces the attachment of scales into the body portion 53 of the sanitary washing apparatus 100.

In addition, since the scale of the fluid heating device 54 does not become full, the life of the sanitary washing device 100 can be extended, and the heating operation of the fluid heating device 54 as well as the sanitary washing device 100 can be extended. The cleaning operation can be stabilized.

In particular, as described above, in the fluid heating device 54, the flow path 9 is provided at the outer circumferential portion of the sheath heater 7, and thermal insulation is performed by the flow path 9. Thereby, it is not necessary to provide a thermal insulation layer, and the fluid heating apparatus 54 can be miniaturized. In addition, since the outer circumferential portion of the sheath heater 7 is surrounded by the flow path 9, the heat of the sheath heater 7 hardly escapes to the outside of the case member 8. Therefore, by employing such a fluid heating device 54, heat dissipation loss is small, heat exchange efficiency can be improved, and a compact sanitary washing device 100 can be realized with energy efficiency.

In the sanitary washing apparatus 100, dead space is formed in the lower portion of the human body washing nozzle 55 by providing the human body washing nozzle 55 that is stretched and contracted in the body portion 53. Since the fluid heating device 54 is cylindrical and compact, it can be provided in the space below the human body cleaning nozzle 55. Therefore, the main body 53 can be miniaturized by employing the fluid heating device 54.

In addition, since the scale is hardly attached to the fluid heating device 54 and the outflow of the scale is also suppressed, the scale does not become full in the flow rate control device 58 or the human body cleaning nozzle 55. Therefore, the flow control device 58 and the human body cleaning nozzle 55 can be used for a long time with a stable operation. Therefore, by employing the fluid heating device 54 as the sanitary washing apparatus 100, the sanitary washing apparatus 100 can be used for a long time in a stable operation.

In addition, when using the instantaneous fluid heating device 54, it is necessary to control the temperature of the fluid in a hurry. Therefore, measures such as increasing the watt density of the sheath heater 7 are necessary. As a result, since the surface temperature of the sheath heater 7 becomes high compared with the surface temperature of the heater used for a low temperature type sanitary washing apparatus, adhesion of a scale becomes remarkable.

In the fluid heating device 54 of the present embodiment, the adherence of the scale is reduced by accelerating the flow rate of the fluid flowing in the flow path 9 by the spiral coil 18.

In addition, by forming the sheath 19, the case member 8 and the spiral coil 18 of the sheath heater 7 with the same material (for example, copper), dislocation corrosion such as dissimilar metal contact corrosion or gap corrosion. Due to this, it is possible to prevent external leakage of the fluid due to a hole in the case member 8 and insulation deterioration due to a hole in the sheath 19. Therefore, the safety and the long life of the sanitary washing apparatus 100 can be realized.

In addition, although this embodiment demonstrated the example which applies the fluid heating apparatus 54 which concerns on 1st Embodiment to the sanitary washing apparatus 100 which wash | cleans local parts of a human body, it is not limited to this, For toilet, Or as an electric hot water supply for use in showers and the like.

(3) Third Embodiment

It is typical sectional drawing of the garment washing apparatus (washing machine) which concerns on 3rd Embodiment. The fluid heating device 54 according to the first embodiment can be employed as the clothes cleaning device.

The clothes washing apparatus 200 of FIG. 6 mainly uses a water supply port 61 for supplying tap water, a washing tank 62, and a main passage 63 or bypass 64 communicating with the washing tank 62 from the water supply port 61. A switching valve 65 for changing the supply of tap water to the furnace and a fluid heating device 54 according to the first embodiment inserted through the bypass 64 are provided.

The detergent dissolution tank 67 is penetrated through the bypass 64 on the downstream side of the fluid heating device 54. In addition, a control circuit 68 for controlling the switching operation of the switching valve 65 for changing the flow path of the tap water and for adjusting the heating temperature of the tap water by the fluid heating device 54 is provided. In addition, a drain port 69 is provided below the washing tank 62.

FIG. 7 is a cross-sectional view taken along the line B-B of the garment cleaning apparatus 200 of FIG. 6.

As shown in FIG. 7, the fluid heating device 54 has a cylindrical shape, and is installed at the corner 70 of the clothes cleaning device 200, thereby saving space.

In such clothing washing apparatus 200, tap water is initially supplied from the water supply port 61, and is supplied into the bypass circuit 64 by the switching valve 65 which can also control the flow volume. Tap water supplied in the bypass 64 is heated to a desired temperature by the fluid heating device 54 to become hot water.

Here, the controller 33 of the fluid heating device 54 controls the energization to the sheath heater 7 so that the temperature detected by the thermistor 32 becomes a temperature suitable for dissolving the detergent in the detergent dissolution tank 67. Even when the temperature of the hot water is low and it is difficult to dissolve the detergent in the winter season, the detergent in the detergent dissolution tank 67 is satisfactorily dissolved by supplying hot water at an appropriate temperature into the detergent dissolution tank 67. Then, the detergent solution having a high concentration is supplied to the clothes in the washing tank 62. The detergent solution having a high concentration penetrates the clothes in the washing tank 62 well. Thereby, the time of the clothing which is difficult to wash can be reliably cleaned.

In the present embodiment, since the fluid heating device 54 does not become full of scale, the life of the clothes cleaning device 200 can be extended, and not only the heating operation of the fluid heating device 54 but also the clothes cleaning device ( The cleaning operation of 200 can be stabilized.

In particular, as described above, in the fluid heating device 54, the flow path 9 is provided at the outer circumferential portion of the sheath heater 7, and thermal insulation is performed by the flow path 9. Thereby, it is not necessary to provide a thermal insulation layer, and the fluid heating apparatus 54 can be miniaturized. In addition, since the outer circumferential portion of the sheath heater 7 is surrounded by the flow path 9, the heat of the sheath heater 7 hardly escapes to the outside of the case member 8. Therefore, by employing such a fluid heating device 54, heat dissipation loss is small, heat exchange efficiency can be improved, and a compact garment cleaning device 200 can be realized by energy efficiency.

In addition, the sheath 19, the case member 8, and the spiral coil 18 of the sheath heater 7 are constituted of the same kind of material (for example, copper), thereby providing potentials such as dissimilar metal contact corrosion or gap corrosion. It is possible to prevent the external leakage of the fluid due to the opening of the case member 8 due to the corrosion and the deterioration of the insulation due to the opening of the hole in the sheath 19. Therefore, it is possible to realize the improvement of the safety and the long life of the garment washing apparatus 200.

In addition, in this embodiment, although the example of the vertical type | mold garment washing apparatus 200 was demonstrated, it is not limited to this, The same effect can be acquired even if it is applied to the drum type garment washing apparatus, such as a horizontal type or an inclined type, for example. have.

(4) Fourth Embodiment

8 is a schematic cross-sectional view of the dish washing apparatus according to the fourth embodiment. As the dish washing device, the fluid heating device 54 according to the first embodiment can be employed.

The dish washing apparatus 300 of FIG. 8 is equipped with the washing tank 81. The cleaning tank 81 has an opening 83.

The door 82 is provided in the opening part 83 so that opening and closing is possible.

Below the washing tank 81, a fluid heating device 54 according to the first embodiment and a pump 85 for circulating the washing water are provided.

In the bottom part of the washing tank 81, the jet apparatus 94 which sprays washing water, and the drip tray 86 which collects washing water are provided. Moreover, in the washing tank 81, the washing | cleaning basket 88 which accommodates to-be-cleaned objects 87, such as tableware, is supported by the rail 89 so that a movement is possible. Moreover, the blowing fan 90 which blows into the washing tank 81 is provided. A water supply pipe 80 for supplying washing water is connected to the inlet port of the fluid heating device 54. The outlet port of the fluid heating device 54 communicates with the drip tray 86 in the cleaning tank 81.

In the dish washing device 300 according to the present embodiment, the washing water is heated by the fluid heating device 54, pressurized by the operation of the pump 85, and sent to the jet device 84, where the jet device 84 is used. From the momentum.

The to-be-cleaned object 87, such as a tableware accommodated in the washing | cleaning basket 88, is wash | cleaned with the washing water sprayed from the jet device 84. After completion of the washing operation, the washing water is discharged from the washing tank 81 by opening a drain valve (not shown), and the to-be-cleaned object 87 such as tableware is dried by ventilation caused by the operation of the blower fan 90. .

Since the scale can be removed and the long-life fluid heating device 54 can be used in the dish washing apparatus 300 according to the present embodiment, the life of the dish washing apparatus 300 can be extended. In addition, since the fluid heating device 54 can be downsized by increasing the watt density of the sheath heater 7, the downsizing of the entire dish washing device 300 can be realized.

In addition, in this embodiment, since the scale does not become full in the fluid heating apparatus 54, the lifetime of the dish washing apparatus 300 can be extended, and not only the heating operation of the fluid heating apparatus 54 but also dish washing are performed. The cleaning operation of the device 300 can be stabilized.

In particular, as described above, in the fluid heating device 54, the flow path 9 is provided at the outer circumferential portion of the sheath heater 7, and thermal insulation is performed by the flow path 9. Thereby, it is not necessary to provide a thermal insulation layer, and the fluid heating apparatus 54 can be miniaturized. In addition, since the outer circumferential portion of the sheath heater 7 is surrounded by the flow path 9, the heat of the sheath heater 7 hardly escapes to the outside of the case member 8. Therefore, by employing such a fluid heating device 54, heat dissipation loss is small, heat exchange efficiency can be improved, and the compact dish washing device 300 can be realized by energy efficiency.

In addition, the sheath 19, the case member 8, and the spiral coil 18 of the sheath heater 7 are constituted of the same kind of material (for example, copper), thereby providing potentials such as dissimilar metal contact corrosion or gap corrosion. It is possible to prevent the external leakage of the fluid due to the opening of the case member 8 due to the corrosion and the deterioration of the insulation due to the opening of the hole in the sheath 19. Therefore, the safety and the long life of the dish washing apparatus 300 can be realized.

(5) Other Embodiments

In the fluid heating device 54 according to the first to fourth embodiments, the sheath heater 7 is used as the heating element, but is not limited thereto, and a ceramic heater or other heating element may be used as the heat source.

(6) Correspondence relationship between each part of embodiment and each component of claim

Hereinafter, although the example of correspondence of each component of an Claim and each part of embodiment is demonstrated, this invention is not limited to the following example.

In the above embodiment, the sheath heater 7 corresponds to the heating element, the case member 8 of the case 100 corresponds to the first structure, and the case members 11 and 13 of the case 100 correspond to the second structure. O-rings 14 and 15 correspond to heat-resistant seals and heat-insulating seals, spiral coils 18 correspond to flow rate conversion mechanisms, controllers 33 correspond to power supply devices, and human body cleaning nozzles ( 55 corresponds to the spray apparatus, the washing tank 62 and the washing tank 81 correspond to the washing tank, and the spray apparatus 84 corresponds to a supply apparatus.

The fluid heating device according to the present invention can be used for heating water or the like as a fluid in various cleaning devices.

Claims (16)

A heating element having a heating portion and a non-heating portion, A case having the heating element, the case having an inlet and a outlet of the fluid; A flow path is formed in the space between the heating element and the case, The case has a first structure surrounding the heat generating portion, and a second structure surrounding the non-heat generating portion, The first structure is made of a heat resistant material Fluid heating device. The method of claim 1, The first structure surrounds the heat generating portion through the flow path, and the second structure maintains the non-heating portion. Fluid heating device. The method of claim 1, The first structure is made of metal or ceramics Fluid heating device. The method of claim 1, The second structure is made of a resin Fluid heating device. The method of claim 1, Further comprising a heat-resistant sealing material for sealing between the first structure and the second structure Fluid heating device. The method of claim 1, Further provided with a heat insulating sealing material for sealing between the first structure and the second structure Fluid heating device. The method of claim 1, The inlet and the outlet are provided in the second structure Fluid heating device. The method of claim 1, There is no potential difference between the heating element and the case Fluid heating device. The method of claim 1, Further comprising a flow rate conversion mechanism for changing the flow rate of the fluid in at least a portion of the flow path Fluid heating device. The method of claim 9, There is no potential difference between the flow rate conversion mechanism and the heating element Fluid heating device The method of claim 9, The flow rate converting mechanism has a potential lower than that of the heating element. Fluid heating device. The method of claim 9, There is no potential difference between the flow rate conversion mechanism and the case. Fluid heating device. The method of claim 9, The flow rate converting mechanism has a lower potential than the case. Fluid heating device. The method of claim 1, And a power supply device for supplying power to the heating element such that the fluid is heated to a predetermined temperature by the heating element while the fluid flows from the inlet to the outlet. Fluid heating device. In the cleaning device for ejecting the fluid supplied from the water supply source to the body of the human body, A fluid heating device for heating the fluid supplied from the water supply source; A jet device for ejecting a fluid heated by the fluid heating device to the human body, The fluid heating device, A heating element having a heating portion and a non-heating portion, A case having the heating element, the case having an inlet and a outlet of the fluid; A flow path is formed in the space between the heating element and the case, The case has a first structure surrounding the heat generating portion, and a second structure surrounding the non-heat generating portion, The first structure is made of a heat resistant material Cleaning device. A cleaning apparatus for cleaning a cleaning object using a fluid supplied from a water supply source, A washing tank accommodating the washing object; A fluid heating device for heating the fluid supplied from the water supply source; A supply device for supplying a fluid heated by the fluid heating device into the cleaning tank, The fluid heating device, A heating element having a heating portion and a non-heating portion, A case having the heating element, the case having an inlet and a outlet of the fluid; A flow path is formed in the space between the heating element and the case, The case has a first structure surrounding the heat generating portion, and a second structure surrounding the non-heat generating portion, The first structure is made of a heat resistant material Cleaning device.

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