JP2008057855A - Fluid heating device and hot water supply device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid heating device equipped with a heater for heating a fluid and combining thermal safety and rational workability by solving a problem of a leakage or the like of the heated fluid in the mounting constitution of a case and a heating element. <P>SOLUTION: The fluid heating device comprises the cylindrical heating element 7 and a cylindrical case 8 surrounding the heating element 7 with a predetermined clearance. Both ends of the heating element 7 and case 8 are integrally formed to secure both thermal safety and easy-to-produce rational workability. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid heating device including a heater for heating a fluid, and a hot water supply device using the fluid heating device.

  Conventionally, in this type of fluid heating apparatus, as shown in FIG. 11, a sheathed heater 105 provided with a flange 104 on one side is fixed with a screw 106 in a pipe-like case 103 provided with an inlet 101 and an outlet 102. And the structure sealed with the packing 108 arrange | positioned at the packing receiving part 107 is proposed (for example, refer patent document 1).

In the above configuration, the washing water flows into the pipe-shaped case 103 from the inlet 101, is heated while flowing through the flow path 109 on the surface of the sheathed heater 105, and warm water is discharged from the outlet 102.
JP 2001-336203 A

  However, in the conventional configuration, the flange 104 and the packing receiving portion 107 are attached to the sheathed heater 105 at two locations, and two packings 108 are arranged in the packing receiving portion, and the case 103 and the sheathed heater 105 are fixed by the screws 106. I am doing so. Since it is configured by a combination of many parts as described above, it takes time to assemble and increases the cost, and may cause defects such as water leakage.

  In addition, instantaneous fluid heaters that instantaneously heat when using cleaning water generally have higher instantaneous power consumption than hot water heaters, and the heater surface temperature when cleaning water is heated is of the hot water type. It becomes hot compared to. In addition, since the distance between the pipe-shaped case 103 serving as the flow path 109 and the surface of the sheathed heater 105 is short, any abnormality such as a controller for controlling energization of the sheathed heater 105 or a sensor for detecting the presence or flow of water has failed. In the case where an abnormal failure is assumed such that the sheathed heater 105 is continuously energized even though there is no water in the pipe-shaped case 103, if the pipe-shaped case 103 is made of resin, there is a possibility of smoke or fire. . Even if the pipe-like case 103 is made of metal, the packing 108 is generally made of rubber or the like, so that the packing 108 may be burned and water inside may leak out. Had problems.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a fluid heating device that achieves both thermal safety and reasonable workability.

  In order to solve the conventional problems, a fluid heating device of the present invention includes a columnar heating element and a cylindrical case that surrounds the heating element with a predetermined gap, and the heating element and the case The two ends are integrally configured.

  This eliminates the risk of water leakage and eliminates the need for packing between the heating element and the case, ensuring both thermal safety at high heat loads and reasonable processability that is easy to produce. It becomes the composition to do.

  The fluid heating device of the present invention can provide a fluid heating device that is compatible with both thermal safety and reasonable processability without fear of water leakage.

  A first invention includes a columnar heating element, a cylindrical case that surrounds the heating element with a predetermined gap, a flow path configured by a gap between the heating element and the case, and the flow path And an outlet for taking out the high-temperature fluid in the flow path, and the heat generating body and the case are integrally configured to eliminate packing between the heat generating body and the case. The structure is simple, the processability is improved, and there is no risk of water leakage.

  In the second invention, in particular, the case of the first invention is reduced in diameter so that at least one end of the cylinder is in close contact with the surface of the heating element, and the heating element and the case are bonded or welded together at the reduced diameter portion. By constructing it mechanically, the structure is simple and the number of parts can be reduced.

  According to a third aspect of the invention, a spacer to be inserted into a gap between the case and the heating element is disposed at least at one end of the cylinder of the case of the first invention, and the heating element and the case are bonded or welded via the spacer. Thus, by integrally configuring, the clearance between the case and the heating element can be accurately maintained with a small number of parts, and the case and the heating element can be firmly integrated.

  In particular, the fourth aspect of the present invention includes a plurality of heating elements according to the first to third aspects, and a plurality of cases surrounding each of the heating elements. Since the length can be shortened, the degree of freedom in design is improved. In addition, since the amount of generated heat can be divided and controlled, a switching element with a small electric capacity can be used, and noise, voltage fluctuation, harmonics, etc. generated by switching can be reduced.

  In the fifth aspect of the invention, in particular, the plurality of flow paths formed on the outer circumferences of the plurality of heating elements of the fourth aspect of the invention are configured in series, so that the water flow rate of each flow path can be made constant. It is easy to make the heat load of the body constant. In addition, since the inlet and the outlet can be formed at one place, the structure is simplified, and the controllability is improved because the temperature can be detected at one place when the temperature of the high-temperature fluid is controlled.

  In the sixth invention, in particular, the case of the first to fifth inventions, the inflow port and the outflow port are integrally configured, and the number of parts can be reduced, so that productivity is improved.

  In the seventh invention, in particular, since the cases of the first to sixth inventions are made of metal, there is no smoke or ignition accident when an abnormal failure occurs such that the heating element is continuously energized. Thermal safety can be secured. Further, heat transfer from the heating element to the metal case increases the heat transfer area to the fluid in the flow path, thereby improving the heat exchange efficiency.

  In the eighth aspect of the invention, in particular, the flow rate conversion means is provided in at least a part of the flow paths of the first to seventh aspects of the invention, whereby the flow rate of the fluid is increased and a scale or the like generated on the surface of the heating element is attached. Since the kimono can be peeled off, adhesion can be reduced, and since the fluid is in a turbulent state, the heat transfer coefficient is increased, a small size and high efficiency can be realized, and a long life can be achieved.

  In the ninth aspect of the invention, in particular, the instantaneous fluid heating apparatus having the configurations of the first to eighth aspects of the invention can heat the required amount of fluid instantaneously with little energy loss when necessary. A fluid heating device having both safety and reasonable processability can be obtained.

In the tenth aspect of the invention, in particular, the hot water supply apparatus using the fluid heating apparatus of the first to ninth aspects of the invention can instantaneously heat a necessary amount of water when necessary, and is thermally safe and rational. It is a fluid heating device that also has processability, and can be made into a safe and compact hot water supply device that has less energy loss than hot water storage and does not run out of hot water.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a fluid heating apparatus according to a first embodiment of the present invention.

  In FIG. 1, a fluid heating apparatus includes a cylindrical sheathed heater 7 as a heating element for heating water as a fluid, a metal cylindrical case 8 surrounding the sheathed heater 7 as a heating element, and a sheathed heater 7. A flow path 9 on the outer periphery of the gas flow path, an inlet 10 for taking water into the flow path 9, and an outlet 12 for taking out the hot water of the flow path 9. The sheathed heater 7 and the case 8 are bonded or welded to form an integral body. It is composed. And in order to comprise the flow path 9 helically, the spiral coil 18 (flow velocity conversion means) is provided.

  The sheathed heater 7 in FIG. 1 has a rod shape with a circular cross section. In this embodiment, a copper tube sheath 19 having good thermal conductivity is used, but a sheath such as stainless steel having high corrosion resistance may be used depending on the type of fluid. The sheathed heater 7 includes a heat generating portion 20 having a heater wire such as nickel chrome and energizing terminals 21 and 22 inside the sheath, and the periphery of the heater wire 20 between the energizing terminals 21 and 22 is made of magnesium oxide powder which is an insulator. The heater wire 20 is heated to a density that is transmitted to the sheath 19 through the magnesium oxide, and the fluid flowing on the sheath surface is heated.

  One end 13 of the case 8 is reduced in diameter so as to be in close contact with the surface of the sheathed heater 7, and the sheathed heater 7 and the case 8 are bonded together at the reduced diameter portion by brazing. In addition, it may adhere | attach with an adhesive agent or a sealing agent, without depending on brazing, and the integrated structure by welding may be sufficient. By directly joining the case 8 and the sheathed heater 7 in this way, the structure is simple and the number of parts can be reduced.

  The other end 14 is provided with a ring-shaped spacer 15 that is inserted into the gap between the case 8 and the sheathed heater 7, and the sheathed heater 7 and the case 8 are bonded together via the spacer 15 by brazing. ing. This may also be an integrated configuration by bonding or welding without using brazing. Since this only cuts the copper pipe that is the material of the case 8, the machining is easy and the clearance between the case 8 and the sheathed heater 7 as the heating element can be accurately maintained with a small number of parts. Furthermore, the case 8 and the sheathed heater 7 can be firmly integrated. If the both ends of the case 8 are reduced in diameter so as to be in close contact with the surface of the sheathed heater 7, the spiral coil 18 having a larger diameter than the outer shape of the sheathed heater 7 cannot be inserted. Therefore, the spiral coil 18 can be inserted between the sheathed heater 7 and the case 8 by leaving at least one end of the case 8 with an inner diameter larger than the outer shape of the spiral coil 18.

  In this embodiment, one end of the case 8 is reduced in diameter and brazed to the sheathed heater 7, and the other end is brazed via the spacer 15. However, both ends of the case 8 may be reduced in diameter and brazed. Alternatively, spacers may be attached to both ends and brazed.

  Further, the case 8 and the inflow port 10 and the outflow port 12 are integrally bonded by brazing.

In addition, a heat transfer plate 29 formed by bending a copper plate so as to be in close contact with the arc of the outer periphery of the case 8 is fastened and fixed with screws, and a power control element of the sheathed heater 7 is used to attach a triac 30 that is a heat generating electronic component. It is fastened and fixed with screws to make sufficient thermal contact. Further, between the heat transfer plate 29 and the outer periphery of the case 8, a temperature fuse 31, which is an overheat prevention means for shutting off the energization to the sheathed heater 7 when abnormal temperature is overheated, is fixed so as to be in sufficient thermal contact. It is. The case 8 and the heat transfer plate 29 are bonded together by brazing, whereby efficient heat conduction can be obtained and the number of parts can be reduced.

  Further, a thermistor 32 that detects the temperature of the fluid is attached to the outlet 12. A signal from the thermistor 32 serving as the energization interrupting means is connected to a controller 33 serving as the control means. A temperature switch in which electrical contacts are mechanically turned on and off at a predetermined temperature so that the heating temperature of the fluid can be prevented from becoming a dangerous temperature even when an electrical failure occurs in the thermistor 32 or the control means 33. A thermostat 34 is installed.

  About the fluid heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the fluid flows in from the inlet 10, the control means 33 starts energizing the sheathed heater 7. Then, heat is exchanged between the fluid flowing between the sheathed heater 7 and the case 8 and the sheathed heater 7, and the fluid heated to a predetermined temperature flows out from the outlet 12. At this time, the temperature of the fluid flowing out from the outlet 12 is sent to the control means 33 from the thermistor 32 which is a temperature detection means, and the control means 33 passes through the triac 30 according to the temperature signal from the thermistor 32. While controlling the power supplied to the sheathed heater 7, the temperature of the fluid flowing out from the outlet 12 is controlled to be a predetermined temperature.

  As described above, when the electric power of the sheathed heater 7 is adjusted by the triac 30, the triac 30 which is a heat generating electronic component also generates heat by the power control element. Therefore, if the heat is not cooled, the triac 30 is damaged by heat. However, as in this embodiment, a heat transfer plate 29 obtained by press bending a copper plate so as to be in close contact with the arc of the outer periphery of the copper tube case 8 is fastened and fixed with screws. With the power control element 7, the triac 30, which is a heat generating electronic component, is fastened and fixed with screws so as to be in sufficient thermal contact, the heat of the triac 30 is transmitted to the heat transfer plate 29 and is radiated to the fluid.

  In addition, since a thermostat 34, which is a temperature switch that mechanically cuts off current at a predetermined temperature, is mounted in the vicinity of the outlet 12, an electrical failure such as the thermistor 32 or the control means 33 is caused by something abnormal. Even if it occurs, the electrical contact of the thermostat 34 is mechanically opened when the heating temperature of the fluid exceeds a predetermined temperature, and the energization to the sheathed heater 7 is cut off, preventing a dangerous temperature. it can.

  Furthermore, since the thermal fuse 18 which is an overheat prevention means is sandwiched and attached between the case 8 and the heat transfer plate 29, the thermistor 32 and the controller 33 which cannot possibly occur first fail, Further, even when it is assumed that all of the thermostats 34 have failed on the unsafe side, the thermal fuse 18 cuts off the electrical continuity when the temperature of the fluid exceeds a predetermined temperature.

  The above is the operation and action when there is water in the case 8, but if something is abnormal and there is no water in the case 8, the heater wire 20 in the sheathed heater 7 is energized. The temperature of the heater wire 20 and the sheath 19 rises. In this case, since there is no water that takes heat away from the surface of the sheathed heater 7, the temperature of the heater wire 20 and the sheath 19 in the inside rises rapidly compared to the case where there is water in the normal case 8. Furthermore, if the heater wire 20 is fully energized as it is, the temperature of the sheath 19 not only rises rapidly, but can also be in a red hot state far exceeding the boiling temperature of 100 ° C.

  However, as in this embodiment, the portion facing the sheathed heater 7 that is a heating element is formed of a metal case 8 that is a heat-resistant material, and the end of the case 8 is integrated with the heater 7 through a reduced diameter or spacer 15. With this configuration, the metal case 8 in which the radiant heat and the conduction heat from the heater wire 20 and the sheathed heater 7 that are at the highest temperature in the case of an abnormal airing as described above are opposed to each other is heated. It is transmitted to the thermal fuse 31 and the heat transfer plate 29 that are in close contact with each other, and acts so that the thermal fuse 31 is melted at a temperature lower than the temperature causing an unsafe situation to cut off the energization to the sheathed heater 7.

  Further, in the fluid heating apparatus of the present embodiment, water flows from the inlet 10 provided at the side surface position eccentric from the center of the case 8 as shown in the side sectional view of FIG. 2 (cross section AA in FIG. 1). Water enters, flows into the outer periphery of the sheath 19 of the sheathed heater 7, and further flows spirally around the outer periphery of the sheath 19 by the spiral coil 18 disposed along the outer periphery of the sheath 19, and is provided on the side surface again. It is discharged from the discharge port 12. Here, the spiral coil 18 arranged in a spiral shape has a cross-sectional area of a substantially donut-shaped flow path formed between the case 8 and the sheath 19 in a cross-sectional area formed between the pitches of the helical coils 18. It was made to turn with the pitch which becomes narrower. As a result, the flow velocity of the swirling flow spirally flowing along the helical coil 18 becomes faster than that without the helical coil 18, and the flow velocity is accelerated.

  In addition, the cylindrical flow passage space surrounded by the case 8 and the sheath 19 has a flow passage cross section with a large aspect ratio. If the spiral coil 18 is not provided, the flow passage provided at the side surface eccentric from the center of the case 8 is provided. The water that has entered from the inlet 10 initially flows spirally along the outer periphery of the sheath 19, but the swirling flow is lost as it goes downstream, and the cylindrical axial flow component gradually becomes the main component. Substantially reduces the water flow rate. However, in this embodiment, since the spiral coil 18 as a flow rate conversion means for forming the flow path 9 in a spiral shape is provided on the outer periphery of the sheathed heater 7 that is a heating element, the flow is a swirling flow and has a high flow velocity. The state continues, and the region of the boundary layer of the sheath 19 of the sheathed heater 7 and the fluid water is very thin. A flow velocity distribution diagram showing this state is schematically shown in FIGS. In this manner, the slow flow rate portion 37 shown in FIG. 3 is reduced as in the boundary layer 38 of the flow rate flow rate distribution shown in FIG. 4, and accumulation of scales and the like attached to the sheath 19 of the sheathed heater 7 is prevented. be able to.

  In addition, the deposited scale portion has an effect of being flowed to the downstream side by the fast flow, and the scale is crushed small by the swirling flow at the flow velocity and flows to the downstream side, so that it is not clogged on the downstream side. And since a scale becomes difficult to adhere in a fluid heating apparatus, the lifetime as a fluid heating apparatus can be extended. In addition, the spiral smooth flow can realize a small flow path pressure loss while achieving a high flow rate, and the high flow rate can improve the heat exchange efficiency and realize downsizing. be able to.

As described above, the flow path 9 is configured by the case 8 provided on the outer periphery of the sheathed heater 7, and the spiral coil 18 that is a flow rate conversion means for accelerating the flow rate is provided in a part of the flow path 9. The flow velocity of the flow path is accelerated, and adhesion of scales and the like generated on the surface of the heating element 7 can be reduced. Then, by forming the flow path 9 that swirls at the outer periphery of the sheathed heater 7, a small size and high efficiency can be realized, and a scale can be prevented from adhering to a long life. And by providing the flow path 9 on the outer periphery of the heating element 7, the heat of the sheathed heater 7 is taken away by the water in the flow path, so that the heat insulation is performed by the flow path, and the heat insulating layer is formed outside the case 8. It is not necessary to provide a small size and can be made small. Moreover, it can be set as the structure which does not escape heat outside by enclosing the heat generating body 7 by a flow path, and can improve heat exchange efficiency. Further, by increasing the flow velocity, the generation of bubbles can be reduced, the generation of scale can be suppressed, and the surface temperature of the sheath 19 of the sheathed heater 7 can be suppressed low, so the generation of boiling noise can be reduced. it can. Incidentally, the spiral coil 18 that is a flow velocity converting means provided in the flow path 9 is made of the same kind of metal as the sheath 19 of the sheathed heater 7 and the metal case 8 (copper in this embodiment), thereby causing corrosion due to electrolytic corrosion. Can be prevented.

  That is, the flow path 9 provided on the outer periphery of the heating element 7, the case 8 constituting the flow path 9, and the spiral coil 18 which is a flow rate conversion means for changing the flow speed at least a part of the flow path 9 are provided. By adopting the configuration, the deposits such as the scale generated on the surface of the heating element 7 can be peeled off by the flow velocity of the flow path 9, so that the adhesion can be reduced, and the small size and the high efficiency are realized and the long life is achieved. It can be.

  The fluid heating device of the first embodiment is summarized as follows: a sheathed heater 7 as a columnar heating element, a cylindrical case 8 surrounding the sheathed heater 7 with a predetermined gap, and the sheathed heater 7 A flow path 9 formed by a gap between the flow path 9 and the case 8, an inlet 10 for taking in the low-temperature fluid into the flow path 9, and an outlet 12 for taking out the high-temperature fluid in the flow path. By integrally configuring both ends of the fluid heater 8, it is possible to eliminate packing between the sheathed heater 7 and the case 8, simplify the structure, improve workability, and eliminate the risk of water leakage. Can be provided.

  Further, the case 8 has a diameter reduced so that at least one end of the cylinder is in close contact with the surface of the sheathed heater 7, and the sheathed heater 7 and the case 8 are bonded or welded to each other at the reduced diameter portion. Thus, a fluid heating apparatus that has a simple structure and can reduce the number of parts can be obtained.

  In addition, a spacer 15 to be inserted into a gap between the case 8 and the sheathed heater 7 is disposed at at least one end of the cylinder of the case 8, and the sheathed heater 7 and the case 8 are bonded or welded together via the spacer 15. With this configuration, the clearance between the case 8 and the sheathed heater 7 can be accurately maintained with a small number of parts, and the case 8 and the sheathed heater 7 can be firmly integrated. Moreover, workability is improved by assembling the spacer 15 after inserting the helical coil 18 into the flow path 9 formed by the gap between the case 8 and the sheathed heater 7.

  Further, since the case 8, the inlet 10 and the outlet 12 are integrally configured, the number of parts can be reduced, so that productivity is improved.

In addition, since the case 8 is made of metal, there is no smoke or ignition accident when the sheathed heater 7 as the heating element is abnormally energized, and thermal safety can be secured. Further, heat transfer from the sheathed heater 7 to the metal case 8 increases the heat transfer area to the fluid in the flow path, thereby improving the heat exchange efficiency.
Further, by providing a spiral coil 20 as a flow rate conversion means in at least a part of the flow path 9, the flow rate of the fluid is increased, and deposits such as scales generated on the sheathed heater 7 can be peeled off, thereby reducing adhesion. In addition, since the fluid is in a turbulent state, the heat transfer coefficient is increased, and a fluid heating apparatus that is small in size, realizes high efficiency, and has a long life can be obtained.

(Embodiment 2)
FIG. 5 shows a cross-sectional view of a fluid heating apparatus according to the second embodiment of the present invention.

FIG. 6 shows a BB cross-sectional view of the fluid heating apparatus according to the second embodiment of the present invention.
5 and 6, the difference from the first embodiment is that the two sheathed heaters 7a and 7b and the two cases 8a and 8b surrounding the sheathed heaters 7a and 7b are arranged in parallel and adjacent to each other. The one outlet 12a and the other inlet 10b are connected in series by a connecting pipe 23.

  Since the two fluid heating devices in the first embodiment are configured, the same parts are denoted by the same reference numerals, the upstream fluid heating devices are denoted by a symbol, and the downstream fluid The number b is attached to the number of the heating device, and the description is omitted.

  As described above, by providing a plurality of sheathed heaters 7a and 7b as heating elements and a plurality of cases 8a and 8b surrounding the sheathed heaters 7a and 7b, each sheathed heater 7a and 7b is provided. Therefore, the thermal expansion and contraction amounts of the sheathed heaters 7a and 7b are reduced, the thermal strain at the ends fixed to the cases 8a and 8b is reduced, and the reliability can be improved. Moreover, since the overall length is shortened, the degree of freedom in design is improved.

  Further, since the calorific value can be divided and controlled, the triacs 30a and 30b having a small electric capacity can be used, and noises, voltage fluctuations, harmonics, etc. generated by the switching of the triacs 30a and 30b can be reduced.

  Further, since the plurality of flow paths 9a and 9b formed on the outer circumferences of the plurality of sheathed heaters 7a and 7b are configured in series, the amount of water flow through each of the flow paths 9a and 9b can be made constant. It is easy to make the heat generation load of the constant. In addition, since the inlet 10a and the outlet 12b can be configured at the same end, the water circuit can be configured at one location, the structure is simplified, and the temperature control of the high temperature fluid can be performed by detecting the temperature at one location. Sexuality improves.

  Although the present embodiment has been described with two heating elements (seeds heater), the same effect can be obtained even if there are three or more heating elements.

(Embodiment 3)
FIG. 7 is a cross-sectional view showing a hot water supply apparatus according to a fourth embodiment of the present invention. This hot water supply apparatus is generally referred to as a warm water washing toilet seat, and tap water is instantaneously heated using the fluid heating apparatus according to the first or second embodiment, thereby washing hot water at an appropriate temperature. It is ejected from 55 and the human body part is washed. In the configuration, a heated toilet seat 52 and a hot water supply device main body 53 are installed on a toilet bowl 51. Then, the fluid heating device 54 according to the first embodiment is provided in the hot water supply device main body 53, and hot water heated to an appropriate temperature is ejected from the cleaning nozzle 55 to clean the local portion of the human body 56. In the hot water supply apparatus main body 53, an on-off valve 57 and a flow rate control valve 58 are provided as main components. Other parts such as the control board are omitted.

  In such a hot water supply apparatus called a warm water washing toilet seat, when the user sits on the heating toilet seat 52, the on-off valve 57 is opened and tap water is introduced into the fluid heating device 54 of the first embodiment. When a washing button (not shown) of a remote controller (not shown) is pressed, the fluid heating device 54 heats the tap water to a desired temperature and controls the flow rate control valve 58 so that the set desired flow rate is obtained. Then, the human body part is washed by being ejected from the washing nozzle 55. That is, the fluid heating device 54 functions as an instantaneous fluid heating device capable of instantaneously heating tap water when it is desired to perform hot water cleaning.

A conventional warm water washing toilet seat is not such an instantaneous fluid heating device, but has a hot water tank of about 1 liter, and the heater is always kept warm to about 40 ° C. and the hot water in the hot water tank is used for washing. Hot water storage type was common. However, in the case of a hot water washing type toilet bowl, the hot water in the hot water tank is always kept at about 40 ° C by the heater, so there is a heat loss from the hot water tank, and the electricity cost is about twice that of the instantaneous type. Inconveniently, it was not preferable. In addition, when the hot water storage amount of the hot water tank is 1 liter, if hot water is used for about 1 minute, the hot water in the hot water tank disappears and the hot water tank is washed with cold water. Thus, in the case of the hot water storage type, there was also a problem of so-called hot water shortage. Further, since the volume of the hot water tank is large, there is a disadvantage that the compactness of the device is impaired.

  In the case of the instantaneous type, the hot water storage type instantaneously heats the water at the cleaning flow rate ejected from the cleaning nozzle 55 by the sheathed heater 7 of the fluid heating device 54, so that the problem of running out of hot water can be solved and continuously. It can be cleaned for a desired time, and it can save almost no heat loss. In addition, the fluid heating device 54 does not require a large hot water tank such as a hot water storage type, and can be made compact. However, in the case of the instantaneous type, since the hot water is instantaneously heated, the rated power (wattage) of the sheathed heater 7 must be larger than the rated power (wattage) of the hot water storage type heater. Because the rated power of the sheathed heater 7 is large, it is necessary to ensure sufficient safety when the rated power enters the sheathed heater 7 due to some abnormal failure or when the sheathed heater 7 becomes empty. is there. As described above, this embodiment is a hot water supply device using the fluid heating device 54 that sufficiently secures thermal safety, and can heat a necessary amount of water instantaneously, and is thermal safety and rational processing. This is a fluid heating device that combines the properties of a hot water storage device with less energy loss than a hot water storage type, and a safe and compact hot water supply device that does not run out of hot water.

  In addition, although the hot water supply apparatus of the present embodiment has been described with the hot water washing toilet seat for washing the human body part, Embodiment 1 even in the case of an electric water heater used for hand washing, showering, etc. in the bathroom, kitchen, bath, etc. Alternatively, as in the case of the warm water washing toilet seat, the fluid heating device 54 of the second embodiment can be used to provide a safe and compact hot water supply device with little energy loss and without running out of hot water. In addition, since a large hot water storage tank can be eliminated, it can be made lighter and thinner, which is advantageous in terms of external design and installation.

(Embodiment 4)
FIG. 8 is a sectional view showing a hot water supply apparatus according to the fourth embodiment of the present invention. This hot water supply device is generally called a washing and washing device. In FIG. 8, a water supply port 61 for supplying water and a water supply route from the water supply port 61 to the washing tub 62 are connected to a main water channel 63 and a bypass channel 64. And a fluid heating device 66 according to the first or second embodiment in the middle of the bypass path 64. Here, there are a detergent dissolution tank 67, a control circuit 68 for performing control related to water channel switching, flow rate and temperature adjustment, and washing, and a drain port 69. Further, as shown in FIG. 9 which is a CC cross section in FIG. 8, the fluid heating device 66 is formed in a cylindrical shape, and is installed vertically in the corner portion 70 of the washing and washing device to save space. .

  The operation and action of the washing and washing apparatus configured as described above will be described below. First, water is supplied from the water supply port 61 and supplied to the bypass path 64 by the switching valve 65 that can also control the flow rate. The supplied water is heated to an appropriate temperature by an instantaneous fluid heating device 66. Here, the appropriate temperature control function of the fluid heating device 66 is the energization control of the sheathing heater 7 for heating so that the water temperature detected by the thermistor 24 provided on the downstream side of the flow path becomes a temperature suitable for dissolving the detergent. Is to do. By instantly heating the water to be supplied and supplying the appropriate temperature water to the detergent dissolution tank 67, the detergent dissolution tank 67 can be used well even when the water temperature is too low and the detergent is difficult to dissolve.

That is, the detergent in the detergent dissolution tank 67 is melted well by the appropriate temperature water heated through the fluid heating device 66 and poured into the clothes in the washing tub 62 in a state where the detergent solution has a high concentration. The well-dissolved high-concentration detergent solution soaks well into the clothes in the washing tub 62. For example, if a liquid detergent is soaked in a stubborn dirty shirt collar in advance and then washed in a washing and washing apparatus, the same effect can be obtained as if the dirt is well removed. In this way, the washing and washing apparatus is heated to an appropriate temperature water by the instantaneous fluid heating apparatus 66, and the detergent is dissolved in advance in the detergent dissolution tank 67 and supplied to the washing tub 62, so that dirt is easily removed regardless of the time. A hot water supply device (washing and washing device) can be provided. In addition, since the instantaneous fluid heating device 66 is heated only when it is used, waste of electric power can be reduced, and the fluid heating device 66 is compact and compact due to the high degree of freedom and compactness of the mounting posture. It can be set as a hot-water supply apparatus (laundry washing apparatus). In addition, even when empty baking or the like occurs due to a fluid supply abnormality or the like, a hot water heater having high safety can be obtained by using the fluid heating device 66 according to the first or second embodiment that ensures sufficient thermal safety. (Laundry washing apparatus) can be provided.

  As described above, in the present embodiment, productivity is achieved by including the fluid heating device according to any one of claims 1 to 8 and the washing tub for pouring the cleaning water heated by the fluid heating device. With a fluid heating device that balances safety with safety, a hot water supply device (laundry washing device) with high dirt removal performance and safety can be provided. In the above embodiment, the example of the vertical type washing and washing apparatus has been described. However, the present invention is not limited to this, and the same effect can be obtained even in a drum type such as a horizontal type or an oblique type.

(Embodiment 5)
FIG. 10 is a cross-sectional view showing a hot water supply apparatus according to a fifth embodiment of the present invention. This hot water supply apparatus is generally called a dishwashing apparatus. In FIG. 10, a washing tank 81, an opening 83 that can be opened and closed by a door 82, and a jet that jets washing water provided below the washing tank 81. Means 84 and pump 85 for circulating cleaning water, water receptacle 86 for storing cleaning water, cleaning basket 88 for storing an object to be cleaned 87 such as tableware, rail 89 for movably supporting the cleaning basket 88, blower fan 90, cleaning A fluid heating device 91 according to Embodiment 1 provided below the tank 81 and a water supply pipe 65 for supplying water to the fluid heating device 91.

  In the hot water supply apparatus (tableware washing apparatus) configured as described above, the washing water in the washing tank 81 is warmed by the fluid heating device 91, and is pumped to the ejection means 84 by the operation of the pump 85 and is urged from the ejection means 84. Well injected. The washing object 87 such as tableware stored in the washing basket 88 is washed by the washing water sprayed from the jetting means 84, and the washing water is drained by opening a drain valve (not shown) after the washing is completed. The object to be cleaned 87 such as tableware is dried by the ventilation of the operation 89. By using the instantaneous fluid heating device 91 according to the first embodiment, the temperature of the cleaning water can be changed to a temperature suitable for the object to be cleaned 87 in a short time, and the cleaning effect can be enhanced, and a wasteful increase in temperature can be achieved. Avoid energy savings. Further, the convenience of the cleaning device can be enhanced by the safety and the compact fluid heating device 91. In this way, the temperature of the wash water can be changed in a short time by the instantaneous fluid heating device with improved safety, so that the optimum washing temperature can be set arbitrarily, and a small and compact hot water supply device (tableware washing device) is provided. Can do.

  As described above, in the present embodiment, the fluid heating device according to any one of claims 1 to 8, the cleaning tank that stores the object to be cleaned such as tableware, and the cleaning heated by the fluid heating device. Equipped with spraying means for spraying water onto the object to be cleaned, and the temperature of the cleaning water can be changed in a short time with a highly safe instantaneous fluid heating device, so the optimal cleaning temperature can be set arbitrarily, and a safe hot water supply device ( A dishwasher).

  As described above, the fluid heating apparatus according to the present invention includes a columnar heating element and a cylindrical case that surrounds the heating element with a predetermined gap therebetween, and the heating element and both ends of the case are integrated. It is constructed in the same way, and it can heat the required amount of fluid instantly with little energy loss and has both thermal safety and rational processability. It can also be applied as hot water supply for a hot water supply device such as a device.

Sectional drawing of the fluid heating apparatus in Embodiment 1 of this invention Side sectional view of the fluid heating device Flow distribution diagram in the fluid heating device Flow distribution diagram in the fluid heating device Sectional drawing of the fluid heating apparatus in Embodiment 2 of this invention Side surface sectional drawing of the fluid heating apparatus in Embodiment 2 of this invention Sectional drawing of the hot water supply apparatus in Embodiment 3 of this invention Sectional drawing of the hot water supply apparatus in Embodiment 4 of this invention Plan sectional view of the water heater Sectional drawing of the hot-water supply apparatus in Embodiment 5 of this invention Sectional view of a conventional fluid heating device

Explanation of symbols

7 Heating element (seeds heater)
8 Case 9 Flow path 10 Inlet 12 Outlet 15 Spacer 18 Flow rate conversion means (spiral coil)

Claims (10)

A columnar heating element, a cylindrical case surrounding the heating element with a predetermined gap, a flow path constituted by a gap between the heating element and the case, and a flow for drawing a low-temperature fluid into the flow path A fluid heating apparatus comprising an inlet and an outlet for taking out a high-temperature fluid in the flow path, wherein the heating element and the ends of the case are integrally formed. 2. The fluid heating according to claim 1, wherein the case is configured such that at least one end of the cylinder is reduced in diameter so as to be in close contact with the surface of the heating element, and the heating element and the case are bonded or welded together at the reduced diameter portion. apparatus. 2. The structure is integrally configured by disposing a spacer to be inserted into a gap between the case and the heating element at least one end of a cylinder of the case, and bonding or welding the heating element and the case via the spacer. Fluid heating device. The fluid heating device according to any one of claims 1 to 3, further comprising a plurality of heating elements and a plurality of cases surrounding the heating elements. The fluid heating apparatus according to claim 4, wherein the plurality of flow paths formed on the outer circumferences of the plurality of heating elements are each configured in series. The fluid heating apparatus according to claim 1, wherein the case, the inlet and the outlet are integrally configured. The fluid heating apparatus according to claim 1, wherein the case is made of metal. The fluid heating apparatus according to any one of claims 1 to 7, further comprising a flow rate conversion means in at least a part of the flow path. An instantaneous fluid heating apparatus having the configuration according to claim 1. A hot water supply apparatus using the fluid heating apparatus according to claim 1.