JP2007010255A - Fluid heating device, and hot water supply device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid heating device providing compatibility between thermal safety and rational workability. <P>SOLUTION: The fluid heating device is provided with: the fluid heating device with cases 8, 11, 13 surrounding a heating element 7; an inlet 10 taking water into a passage 9 in an outer circumference of the heating element 7; an outlet 12 for taking out hot water of the passage 9, and cases 8, 11, 13 with structural bodies of a plurality of materials, so that both thermal safety and easy-to-produce rational workability are secured. <P>COPYRIGHT: (C)2007,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. 9, 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 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 108 on the surface of the sheathed heater 105, and warm water is discharged from the outlet 102.
JP 2001-336203 A

  However, the instantaneous fluid heating device that heats instantaneously when using the cleaning water as in the conventional configuration generally has a higher instantaneous power consumption than the heater used in the hot water storage type heating device. The heater surface temperature during water heating is higher than that of the hot water storage type. In addition, since the distance between the pipe-shaped case 103 serving as the flow path 108 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. Thus, if 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 generation. It is done. On the other hand, when the pipe-like case 103 is made of metal, it is highly safe against accidents caused by the above-described heat load. However, in order to form the inlet 101 and the outlet 102, for example, brazing or complicated pipes are used. It required processing technology and was not suitable for mass production.

  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 heating element, a case surrounding the heating element, a flow path on the outer periphery of the heating element, and an inlet for taking water into the flow path. The outlet for taking out the hot water in the flow path and the case include a plurality of material structures.

  This makes it possible, for example, to use heat-resistant materials in areas with high heat loads and materials with relatively high moldability in areas with relatively low loads. It is the structure which ensures both the reasonable workability which is easy to do.

  The fluid heating device of the present invention can arrange materials according to the thermal load, and can be easily configured with high thermal safety.

In the first invention, the case is made of a structure made of a plurality of different materials, so that a portion with a high thermal load is a material with high heat resistance, and a portion with a low thermal load is a material that is easy to produce. The material can be arranged according to the load, the thermal safety is high, and the configuration can be facilitated.

  In the second invention, in particular, in the case of the first invention, at least one structure is made of a heat-resistant material, so that the heat-resistant temperature of the structure at a high temperature can be increased and the thermal safety is increased. be able to.

  According to the third aspect of the invention, in particular, the case of the first aspect of the present invention is such that the portion facing the heat generating portion of the heat generator is made of a heat resistant material, so The temperature is increased and the thermal safety can be increased.

  In the fourth invention, in particular, the case of the first to third inventions is composed of a metal structure and a resin structure, so that the high temperature portion is heat resistant with a metal case that is a metal structure. The safety can be ensured, and the low temperature portion can be easily manufactured with a resin case which is a resin structure, so that the thermal safety is high and the configuration is easy.

  In the fifth aspect of the invention, in particular, the metal case according to the fourth aspect of the present invention is a metal case in which the seal material between the metal structure and the resin structure is a seal structure using a heat-resistant seal material. Even when the temperature of the liquid becomes high, the sealing can be ensured, and external leakage of the fluid can be prevented.

  In the sixth aspect of the invention, in particular, the metal case according to the fifth aspect of the invention is a metal case in which the seal material between the metal structure and the resin structure is a seal structure using a heat insulating seal material. Even when the temperature of the resin becomes high, the heat conduction to the resin case, which is a resin structure, can be suppressed, and the resin case can be prevented from being damaged at a high temperature.

  In the seventh aspect of the invention, in particular, the resin structure of the fourth aspect of the invention is provided with an inlet and an outlet, so that it becomes a somewhat complicated shape to add, for example, a low pressure loss configuration and a fluid stirring function. However, since it can be easily processed by resin molding, it is possible to ensure both thermal safety and rational processability that is easy to produce by combining with a metal structure.

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

  In the ninth aspect of the invention, in particular, the hot water supply device using the fluid heating device of the first to eighth 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, the fluid heating device includes a sheathed heater 7 as a heating element that heats water as a fluid, a metal case 8 that surrounds the sheathed heater 7 that is the heating element, and a flow path 9 on the outer periphery of the sheathed heater 7. A resin case 11 that is a resin structure having an inlet 10 for taking water into the flow path 9; a resin case 13 having an outlet 12 for taking out hot water from the flow path 9; 11 and 13 are composed of a structure made of a plurality of materials such as a metal case and a resin case which are metal structures, and between the metal case 8 and the resin case 11 and between the metal case 8 and the resin case 13. Are provided with O-rings 14 and 15 for fluid sealing, respectively. Also, O-rings 16 and 17 for fluid sealing are provided between the sheathed heater 7 and the resin cases 11 and 13, respectively. And the metal case 8 which comprises the flow path 9 surrounding the outer periphery of the sheathed heater 7, and the helical coil 18 are provided in order to comprise the said flow path 9 helically. The helical coil 18 can hold the helical coil 18 simply by fitting a terminal portion into a helical coil fixing groove 40 provided in the resin case 11 and inserting and attaching the case 8 to the case 11. With this locking structure, the helical coil 18 is reliably prevented from coming out of the flow path and prevented from rotating in the flow path. Further, the resin case 11 is provided with a main body attaching portion 41 and the resin case 13 is provided with a main body attaching portion 42 in order to attach and fix the position of the fluid heating device.

  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 is divided into a heat generating portion 20 having a heater wire such as nickel chrome inside the sheath and non-heat generating portions 27 and 28 (shaded portions) at the sheath end. The non-heat generating portion 27 (shaded portion) has energization terminals 21 and 22 inside, and the energization terminals 21 and 22 have little electrical resistance and therefore hardly generate heat even when energized. The periphery of the heater wire 20 between the energizing terminals 21 and 22 is filled with magnesium oxide powder, which is an insulator, at high density, and the heat generated by the heater wire 20 is transmitted to the sheath 19 through this magnesium oxide, and the sheath surface The flowing fluid is heated.

  The O-rings 14, 15, 16, and 17 are sealing materials as holding members for preventing the fluid flowing in the cases 11, 8, and 13 from leaking to the outside. First, the holding plate 23 is screwed into the resin case 11 in a state where the O-ring 14, which is a sealing material, is fitted between the metal case 11 and the resin case 11 made of a copper tube that has been laid out on the inlet 10 side. By fixing with, the fluid is sealed so as not to leak out of the case 11. The O-ring 16 is sealed so that fluid does not leak out of the case 11 by sealing between the sheath 19 and the resin case 11 and fixing the holding plate 24 to the resin case 11 with screws. Then, on the outlet 12 side, the holding plate 25 is attached to the resin case 13 in a state where the O-ring 15 that is a sealing material is fitted between the metal case 11 and the resin case 13 made of a copper tube that has been laid out. By fixing with screws, sealing is performed so that fluid does not leak out of the case 13. The O-ring 17 is sealed so that fluid does not leak out of the case 13 by sealing between the sheath 19 and the resin case 13 and fixing the holding plate 26 to the resin case 13 with screws.

  The O-rings 16 and 17 also serve to hold the sheathed heater 7 as a heating element, in addition to the role of external fluid sealing to prevent the fluid from leaking outside the cases 11, 8 and 13. Yes. That is, the O-ring 16 is sandwiched between the presser plate 23 and the case 11 and comes into contact with the outer periphery of the non-heating portion 27 at one end of the sheathed heater 7, and the O-ring 17 is sandwiched between the presser plate 26 and the case 13. In this configuration, the outer periphery of the sheathed heater 7 is held in contact with the outer periphery of the non-heat generating portion 28 at the other end of the heater 7.

  Further, 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 metal case 8 is fastened and fixed with screws, and a power control element of the sheathed heater 7 is used as a heat generating electronic component. Are fastened and fixed with screws so that they are in sufficient thermal contact. Further, between the heat transfer plate 29 and the outer periphery of the metal case 8, a thermal fuse 31, which is an overheat prevention means for interrupting the energization of the sheathed heater 7 when the abnormal temperature is overheated, is in sufficient thermal contact. It is fixed.

  A thermistor 32 for detecting the temperature of the fluid is attached to the outlet 12 of the resin case 13. 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 from the thermistor 32 as temperature detection means to the control means 33, 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 the present embodiment, a heat transfer plate 29 obtained by press bending a copper plate so as to be in close contact with the circular arc on the outer periphery of the metal case 8 of the copper tube is fastened and fixed with screws, and the seeds are formed. With the configuration in which the power control element of the heater 7 is used to fasten and fix the triac 30 that is a heat generating electronic component with screws so as to be in sufficient thermal contact, the heat of the triac 30 is transmitted to the fluid through the heat transfer plate 29.

  Further, since a thermostat 34, which is a temperature switch that mechanically cuts off current at an electrical contact at a predetermined temperature, is mounted near the outlet 12 of the resin case 13, even if there is something abnormal, the thermistor 32, the control means 33, etc. Even when an electrical failure occurs, if the heating temperature of the fluid exceeds a predetermined temperature, the electrical contacts of the thermostat 34 are mechanically opened, and the energization to the sheathed heater 7 is cut off. Can be prevented.

  Furthermore, since the thermal fuse 18 which is a means for preventing overheating is sandwiched between the metal case 8 and the heat transfer plate 29, the thermistor 32 and the controller 33 that would never occur are broken down. Further, even when it is assumed that all 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 cases 11, 8, and 13. However, if something is abnormal and there is no water in the cases 11, 8, and 13, the sheathed heater 7 The heater wire 20 inside is energized, and 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 cases 11, 8, 13. . 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, since the portion facing the heater wire 20 that is the heat generating portion of the sheathed heater 7 that is the heat generating member is configured by the metal case 8 that is a heat-resistant material as in the present embodiment, The radiant heat from the heater wire 20 and the sheathed heater 7 to be heated heats the inner surface of the opposing metal case 8, and the heat is transmitted to the thermal fuse 31 and the heat transfer plate 29 that are in close contact with the outer side of the metal case 8. The temperature fuse 31 is blown at a temperature lower than the temperature causing the situation, and the energization to the sheathed heater 7 is cut off. If this metal case 8 is made of a resin case, if it is blown, there is a possibility that smoke will be emitted from the resin case due to the high-temperature radiant heat of the sheathed heater 7, and since the thermal conductivity of the resin is small, the temperature fuse 31 is not yet blown. In addition, the sheathed heater 7 may be further energized and heated to melt the resin case and open a hole. Therefore, by configuring the cases 11, 8, and 13 with a plurality of materials such as the metal case 8 and the resin cases 11 and 13 as in the present embodiment, there is a portion where the heat load may be particularly high during an abnormality. The material can be arranged according to the heat load, such as the metal material with high heat resistance, and the low heat load is made of resin material that is easy to produce. The case 11 having an inflow port 10 that is highly reliable and that is eccentric with respect to the axis of the sheathed heater 7 that penetrates the case 11 can also be easily produced by resin injection molding and has features that are easy to configure. it can.

  Note that the sheath ends of the sheathed heaters 7 facing the resin cases 11 and 13 are non-heat generating portions 27 and 28 (shaded portions), and therefore the temperature is lower than the outer sheath of the heat generating portion 20. Therefore, the resin 11 and 13 facing the non-heat generating portions 27 and 28 (shaded portions) at the sheath end portion of the sheathed heater 7 can be used at the heat resistant temperature of the resin. The sealing materials 14 and 15 between the metal case 8 and the resin cases 11 and 13 are fluororubber O-rings and have a heat resistant temperature of about 200 ° C.

  In the case of an O-ring of nitrile rubber or ethylene propylene rubber, the heat resistant temperature is about twice as high as that of about 100 ° C. In other words, the seal material between the metal case 8 and the resin cases 11 and 13 has a seal configuration using a heat-resistant seal material, so that the seal can be ensured even when the metal case 8 becomes hot. , It is possible to prevent external leakage of fluid.

  Further, since the sealing materials 16 and 17 between the sheath 19 of the sheathed heater 7 and the resin cases 11 and 13 are also sealed with a fluororubber O-ring which is a heat-resistant sealing material, an air blow abnormality occurs and a temperature fuse is generated. Even when the sheath 19 reaches a high temperature and the heat is transferred to the O-rings 16 and 17 before the energization of 31 is cut off, external leakage of the fluid can be prevented because of the heat-resistant seal.

  Furthermore, the sealing members 14, 15, 16, and 17 described above are rubber O-rings, which are heat insulating sealing materials that have an extremely small thermal conductivity compared to metals, and the metal case 8 and the sheath 19 are heated to a high temperature. Even in such a case, the heat conduction to the resin cases 11 and 13 can be suppressed, and the resin cases 11 and 13 are damaged due to softening or scorching at a high temperature, thereby preventing the external leakage that the fluid leaks to the outside of the case due to the loss of sealing performance. can do. Furthermore, in addition to the effect of preventing external leakage, this embodiment has a configuration in which the outer peripheral portions of both ends of the rod-shaped sheathed heater 7 and the inside of the resin cases 11 and 13 are sealed with rubber O-rings 16 and 17, so that the temperature changes. Even if the sheathed heater 7 is expanded and contracted in the axial direction and the radial direction, the rubber O-rings 16 and 17 can be bent in the radial direction and the axial direction while maintaining the sealing property by the rubber elasticity, and the axial expansion and contraction is possible. Since the sheathed heater 7 is slidably supported in the axial direction while being sealed by the O-rings 16 and 17, excessive tensile or compressive stress does not act on the sheathed heater 7 and the resin cases 11 and 13. It has a unique effect of ensuring excellent durability reliability against repeated expansion and contraction due to heat.

The sheathed heater 7 is supported by the O-rings 16 and 17 so as to be slidable in the axial direction. In order to prevent the sheathed heater 7 from gradually shifting in the axial direction and repeatedly coming off due to repeated expansion and contraction, the presser plate 23 is used. , 26 are partially bent into a U-shape to form stoppers 35 and 36. Even if the sheathed heater 7 is shifted to the left or right in the axial direction, the stopper 35,
When contacted by 36, there is no further displacement, and no excessive mechanical stress acts on the sheathed heater 7 and the resin cases 11, 13. For example, if the support is such that the flanges are brazed to both ends of the sheathed heater 7 and secured to the case, the dimensional change due to the expansion and contraction of the sheathed heater cannot be elastically absorbed, so There is a possibility that cracking may occur due to repeated mechanical stress, but if the sheathed heater 7 is supported by the O-rings 16 and 17 so as to be slidable in the axial direction, expansion and contraction are possible. It has the effect of preventing crack breakage due to, and the effect of suppressing heat conduction to the resin cases 11 and 13.

  Since the cases 11 and 13 are made of resin, a somewhat complicated shape can be easily formed by a resin molding process such as injection molding. Therefore, not only the inflow port 10 and the outflow port 12 but also the thermistor 32 and the thermostat 34 are provided. A shape that can be integrally and compactly mounted can be easily realized. For example, the flow path shape has a low pressure loss such that the flow path cross-sectional area changes smoothly with the inflow port 10 and the outflow port 12, or the inflow port 10 and the outflow port 12 are eccentric from the axis of the sheathed heater 7 or the metal case 8. Thus, in order to make the flow path shape that enhances the flow scale adhesion prevention effect while the fluid swirls around the surface of the sheathed heater 7, even if the cases 11 and 13 have a somewhat complicated shape, they can be easily processed by resin molding. Furthermore, fine structures such as the helical coil fixing groove 40 and the body attachment portions 41 and 42 shown in FIG. In particular, the helical coil and the main body attachment portions 41 and 42 may be changed in shape in accordance with the attachment situation, and a workability for a precise shape is required. Thus, the combination with the metal case 8 can satisfy both thermal safety and rational processability that is easy to produce.

  Further, in the fluid heating apparatus of the present embodiment, the water flows in the inlet 10 provided at the side surface position eccentric from the center of the resin case 11 as shown in the side cross-sectional view of FIG. From the sheath 19 and flows into the outer periphery of the sheath 19 of the sheathed heater 7. Further, the spiral coil 18 arranged spirally along the outer periphery of the sheath 19 flows spirally around the outer periphery of the sheath 19 and flows again to the side surface. The ink is discharged from the provided 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.

  Further, the deposited scale portion has an effect of being flowed to the downstream side by a fast flow, and the scale is crushed small by the swirling flow at a 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 heating element 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. Further, by forming the flow path 9 that swirls at the flow velocity on the outer periphery of the heating element 7, a small size and high efficiency can be realized, and a scale can be prevented from adhering to a long life. Then, by providing the flow path 9 on the outer periphery of the heating element 7, the heat of the heating element 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. There is no need to provide a small size, and the size can be reduced. 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 rate conversion means provided in the flow path 9 is made of the same kind of metal as the sheath 19 of the sheathed heater 7 or the metal case 8 (copper in this embodiment), and thus corrodes due to the electrolytic corrosion action. 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.

  Summarizing the fluid heating device of the first embodiment described above, by forming the cases 11, 8, and 13 with a plurality of materials, the portion with high heat load is a metal material with high heat resistance, and the portion with low heat load is By disposing different types of materials according to the heat load, such as a resin material that is easy to produce, a fluid heating device that is easy to produce and has high thermal safety can be provided.

  In addition, by configuring at least one of the plurality of cases 11, 8, and 13 with a heat-resistant material such as metal, the heat-resistant temperature of the structure at a high temperature can be increased, and there is no concern about thermal damage. A thermally safe fluid heating device is obtained.

  In addition, the case can be secured even in the case of an abnormality such as airing, because the portion of the heating element 7 that faces the heating portion 20 is made of a heat-resistant material.

  In addition, the sealing material between the metal case 8 and the resin cases 11 and 13 has a sealing configuration using a heat-resistant sealing material, so that the sealing can be ensured even when the metal case 8 becomes hot, It is possible to prevent external leakage of fluid.

  In addition, since the seal material between the metal case 8 and the resin cases 11 and 13 has a sealing configuration using a heat insulating seal material, heat conduction to the resin cases 11 and 13 even when the metal case 8 becomes high temperature. And the resin cases 11 and 13 can be prevented from being damaged at a high temperature.

  Further, since the inflow port 10 and the outflow port 12 are provided in the resin cases 11 and 13, for example, a low pressure loss configuration or a fluid agitation function can be added, so that even a slightly complicated shape can be easily processed by resin molding. Therefore, the combination with the metal case 8 can ensure both thermal safety and rational processability that is easy to produce.

(Embodiment 2)
FIG. 5 is a cross-sectional view showing a hot water supply apparatus according to the second embodiment of the present invention. This hot water supply apparatus is generally referred to as a warm water cleaning toilet seat, and tap water is instantaneously heated using the fluid heating apparatus of the first embodiment, and hot water having an appropriate temperature is ejected from the cleaning nozzle 55. It cleans the human body part. 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 of 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 washing nozzle 55 to wash the local part 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. As in the case of the hot water washing toilet seat, the fluid heating device 54 can be used to provide a safe and compact hot water supply device that has little energy loss and does not run 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 3)
FIG. 6 is a cross-sectional view showing a hot water supply apparatus according to a third embodiment of the present invention. This hot water supply apparatus is generally called a washing and washing apparatus. In FIG. 6, a water supply port 61 for supplying water and a water supply path from the water supply opening 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 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. Moreover, as shown in FIG. 7 which is a BB cross section in FIG. 6, the fluid heating device 66 is formed in a cylindrical shape, and is installed in the corner portion 70 of the laundry washing device in the vertical direction 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 in the case where empty baking or the like occurs due to fluid supply abnormality or the like, a highly safe hot water supply device (laundry washing device) can be obtained by using the fluid heating device 66 of the first embodiment that ensures sufficient thermal safety. Can provide.

  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 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 apparatus is generally called a dishwashing apparatus. In FIG. 8, a washing tank 81, an opening 83 that can be opened and closed by a door 82, and a jet that is provided below the washing tank 81 and jets washing water. 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. Objects to be cleaned such as tableware by ventilation by driving 89
7 is dried. 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, in the fluid heating device according to the present invention, the flow rate conversion means is installed in the flow path provided on the outer periphery of the heating element, so that the fluid flow rate in the flow path is accelerated and the scale generated on the surface of the heating element The deposits can be reduced, and the device can be small, achieve high efficiency and have a long life. And the sanitary washing apparatus using it can implement | achieve energy saving, size reduction, and can be set as a long-life apparatus.

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 hot water supply apparatus in Embodiment 2 of this invention Sectional drawing of the hot water supply apparatus in Embodiment 3 of this invention Plan sectional view of the water heater Sectional drawing of the hot water supply apparatus in Embodiment 4 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 11 Case (resin case)
12 Outlet 13 Case (resin case)
14 Sealing material (O-ring)
15 Sealing material (O-ring)
16 Sealing material (O-ring)
17 Sealing material (O-ring)
DESCRIPTION OF SYMBOLS 18 Spiral coil 20 Heat generating part 23 Pressing plate 24 Pressing plate 25 Pressing plate 26 Pressing plate 27 Non-heating part 28 Non-heating part 29 Heat transfer plate 30 Triac 31 Thermal fuse 32 Thermistor 33 Controller 58 Fluid heating device 66 Fluid heating device 91 Fluid Heating device

Claims (9)

A heating element, a case surrounding the heating element, a flow path on the outer periphery of the heating element, an inlet for taking in the low temperature fluid into the flow path, an outlet for taking out the high temperature fluid in the flow path, and a plurality of cases A fluid heating device comprising a structure made of different materials. The fluid heating device according to claim 1, wherein at least one structure is made of a heat-resistant material. The fluid heating device according to claim 1, wherein the case is formed of a heat resistant material at a portion facing the heat generating portion of the heat generating element. The fluid heating device according to claim 1, wherein the case includes a metal structure and a resin structure. 5. The fluid heating apparatus according to claim 4, wherein a seal structure using a heat-resistant sealing material is provided between the metal structure and the resin structure. The fluid heating apparatus according to claim 5, wherein a seal structure using a heat insulating sealing material is provided between the metal structure and the resin structure. The fluid heating apparatus according to claim 4, wherein an inlet and an outlet are provided in the resin structure. 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.