JP2008175423A - Electric water heating unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe electric water heating unit of high convenience, connected to a water pipe and capable of supplying hot water by high frequency electromagnetic induction heating. <P>SOLUTION: In this electric water heating unit comprising a non-magnetic cylinder 2 disposed around a water pipe 1, a heating coil 3 wound on an outer peripheral face of the non-magnetic cylinder 2, a pipe supporting portion 9 and a coil supporting portion 6 respectively fixing the water pipe and the heating coil 3 to an outer frame 30, a non-magnetic metallic case 7 fixed to the outer frame 30 and disposed around the heating coil 3, a cooling fan 8 disposed on the non-magnetic metallic case 7 for cooling the heating coil 3, a board unit 20 for controlling power distribution to the heating coil 3, a cooling fan 22 for cooling the board unit 20, and an outlet pipe 12 connected to a hot water outlet side of the water pipe 1, the length of the non-magnetic cylinder 2 is longer than its diameter, the non-magnetic cylinder 2 is longitudinally disposed, and the heating coil 3 is approximately vertically disposed on an outer peripheral face of the non-magnetic cylinder 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of an electric hot water heating unit that supplies hot water by heating tap water by high frequency electromagnetic induction heating.

  For example, Patent Document 1 discloses a high-frequency electromagnetic induction water heater that supplies hot water having a desired temperature by heating tap water with a heating coil.

  As shown in FIG. 6, the water heater described in Patent Document 1 includes a water pipe 72 connected to a water pipe 71 through which water passes, and a heating means 77 provided in a path of the water pipe 72. Is an outer wall 73 serving as a coil base, a heating element 74 disposed inside the outer wall 73 and induction-heated, a heating coil 75 wound around the outer wall 73, and an AC connected to the heating coil 75. The AC power supply means 76 for supplying electric power is used to heat tap water by the heating means 77 and supply hot water at a desired temperature.

JP-A-9-145156

  In the above-described conventional water heater, the outer wall 73 serving as a coil base is generally formed of a heat-resistant resin. However, the outer peripheral portion around which the heating coil 75 is wound becomes high temperature, and the inner peripheral surface and the heating element 74 are heated. When cold water flows through the gap A, the resin deforms due to the temperature difference between the two, and the dimension of the gap A through which the water flows changes.

  Further, a metal water pipe 72 is connected to the lower surface and the upper surface of the outer wall portion 73 so that water flows into the outer wall portion 73 from below and is heated by the heating element 74 and the heating coil 75 so that hot water flows out from the upper surface. Therefore, it is difficult to form a structure that seals the connection portions B and C between the outer wall portion 73 and the water pipe 72, and depending on the formation, there is a risk of water leakage such as cracking due to repeated expansion and contraction.

  Further, as described above, since the heating element 74 is inserted into the outer wall portion 73 and the gap A through which water passes is formed between them, the heating element 74 is firmly fixed in the outer wall portion 73 around and above and below. The fixing is difficult, and if the fixing state is poor, the distance between the heating element 74 and the heating coil 75 is changed, the heating state is not constant, and the performance of heating water is deteriorated.

  Furthermore, since the eddy current flowing on the surface of the heating element 74 is a minute current, when water flows around the heating element 74, the water becomes a resistor and the ability of electromagnetic induction heating is reduced.

  The present invention provides an easy-to-use and safe electric hot water heating unit that can be connected to a water supply to supply hot water by electromagnetic induction heating.

  In Claim 1 of this invention, the water pipe connected to a water pipe, the nonmagnetic cylinder arrange | positioned around the water pipe, the heating coil wound around the outer peripheral surface of the nonmagnetic cylinder, the water pipe and the heating coil A pipe support portion and a coil support portion that are fixed to the outer frame, a non-magnetic metal case that is fixed to the outer frame and disposed around the heating coil, and a cooling coil cooling device provided in the non-magnetic metal case. In an electric hot water heating unit comprising a cooling fan, a substrate unit for controlling energization of a heating coil, a cooling fan for cooling the substrate provided in the substrate unit, and an outlet pipe connected to the hot water outlet side of the water pipe The non-magnetic cylinder has a length longer than its diameter and is arranged vertically and a heating coil is arranged upright on the outer circumferential surface thereof.

  According to the second aspect, the nonmagnetic cylinder and the water pipe wound with the heating coil are arranged concentrically while maintaining a certain gap, and both ends of the water pipe are protruded outside the both ends of the nonmagnetic cylinder. It is a thing.

  According to a third aspect of the present invention, a concentric plate that maintains concentricity is provided between the non-magnetic cylinder around which the heating coil is wound and the water pipe, and a plurality of notches along the circumferential direction are provided at the contact portion of the concentric plate with the water pipe. It is provided so that the condensed water on the surface of the water pipe flows down through the notch.

  According to a fourth aspect of the present invention, the water pipe is fixed by the lower pipe support portion and is held with a gap formed by the upper pipe support portion.

  In claim 5, the non-magnetic cylinder is provided with two winding start plates for fixing the winding start position and the winding end position of the heating coil, and the litz wire leading portion is fixed to one of the winding start plates to start winding, The winding end portion also fixes the litz wire lead portion to the other winding start plate, holds the two winding start plates by the coil support portion, and fixes the coil support portion to the nonmagnetic metal case.

  According to a sixth aspect of the present invention, the nonmagnetic metal case is formed by integrally joining a base fixed to the outer frame and a cover that covers the periphery of the heating coil.

  In the seventh aspect of the present invention, the nonmagnetic metal case covers the lower surface with a bottom plate, and a cooling fan is attached to the side surface above the bottom plate, and an air inlet is provided in the outer frame facing the cooling fan. An exhaust port is provided in the outer frame below the opening on the upper surface, and a first air duct is provided in a space formed between the intake port and the non-magnetic metal case and the heating coil and a path from the space to the exhaust port. It constitutes.

  In claim 8, the heating coil wound around the non-magnetic cylinder is constituted by a litz wire, and the surface of the litz wire is formed and fixed with a coating material to ensure insulation.

  According to claim 1 of the present invention, the non-magnetic cylinder wound with the heating coil is longer than the diameter, and the vertically long heating coil is arranged substantially vertically, so that If the water moves so as to flow from below, bubble accumulation due to overheating does not occur, and since there is no portion where the water is not immersed in the heating part, abnormal heating does not occur and safety is improved.

  According to claim 2, the non-magnetic cylinder and the water pipe wound with the heating coil are arranged concentrically while maintaining a certain gap, and both ends of the water pipe are located outside the both ends of the non-magnetic cylinder. The heat generation state can be kept constant, the performance can be stabilized, the connection part can be provided outside the magnetic field range of the heating coil, the connection part does not shrink due to heating, and water leaks due to cracks, etc. Can be prevented.

  According to claim 3, a concentric plate that maintains concentricity is provided between the non-magnetic cylinder around which the heating coil is wound and the water pipe, and a notch portion along the circumferential direction is in contact with the water pipe of the concentric plate. Since the condensed water on the surface of the water pipe flows down through this notch, the insulation of the heating coil is ensured even if a large amount of condensed water adheres to the surface of the water pipe by repeated heating and cooling with tap water. In addition, the condensed water can be discharged smoothly.

  According to claim 4, a water pipe for flowing water by connecting to a water pipe, and a pipe support part for fixing the water pipe to the outer frame are arranged in the lower pipe support part in consideration of the thermal expansion of the water pipe. Is fixed to prevent vertical movement and fall prevention, and the upper pipe support does not constrain the vertical and horizontal movements so that there is a gap, so the expansion stress that may cause thermal expansion in the fixed part of the outer wall Can escape.

  According to claim 5, the non-magnetic cylinder is provided with two winding start plates for fixing the positions of the start and end of winding of the heating coil, and the litz wire lead portion is fixed to one of the winding start plates and wound. At the beginning and end of winding, fix the litz wire lead to the other winding start plate, hold the two winding start plates by the coil support, and fix the coil support to the non-magnetic metal case Therefore, the heating coil can be heated without moving, and can be fixed to the outer frame, so that stable performance can be obtained.

  According to the sixth aspect, since the non-magnetic metal case is constituted by the base fixed to the outer frame and the cover that covers the periphery of the heating coil, radio waves leak from the outer periphery of the heating coil that supplies high-frequency power. It is possible to suppress abnormal electric waves from flooding other electrical products.

  According to claim 7, an intake port is provided in the outer frame facing the cooling fan of the heating coil, an exhaust port is provided in the outer frame below the upper surface opening of the nonmagnetic metal case, and the nonmagnetic metal case Since the first air duct was constructed in the space formed between the heating coils and the path from this space to the exhaust port, the wind that became hot air by taking the heat of the heating coil by forced cooling by the cooling fan, It rises smoothly from the bottom to the top due to the natural flow, reaches the exhaust opening of the outer frame from the opening on the top surface of the non-magnetic metal case, cools the heating coil efficiently, stabilizes the performance with a power-saving type, and heats It is possible to prevent the coil from condensing and splashing water, and to ensure the safety of electrical insulation regardless of the waterproof structure of the outer frame.

  According to claim 8, the heating coil wound around the non-magnetic cylinder is composed of litz wire, and the surface of the litz wire is fixed by making a coating with a coating material, so that insulation is ensured. Prevents malfunction of electrical, magnetic shielding, and electronic parts, ensuring safety.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, an outer frame 30 constitutes an outer shell of an electric hot water heating unit, and is used by being installed on a wall of a bathroom or the like.

  The water pipe 1 is made of rust-proof magnetic stainless steel, and the lower end thereof is connected to the water pipe 42 via the lower joint 10 and the connecting pipe 13, and the upper end is connected to the water tap via the upper joint 11. The outlet pipe 12 to which the attached outlet 12a is attached is connected.

  In addition, the water pipe 1 is arranged vertically in the outer frame 30 so as to be substantially vertical, and an upper portion and a lower portion thereof are fixed to the outer frame 30 by the pipe support portion 9.

  Around the water pipe 1, a non-magnetic cylinder 2 made of ceramic or the like is disposed vertically so as to be concentric with a certain gap. At this time, the upper and lower ends of the water pipe 1 are set so as to protrude outside the upper and lower ends of the nonmagnetic cylinder 2.

  The non-magnetic cylinder 2 is configured to have a length longer than its diameter, and a heating coil 3 made of a litz wire 3a is wound around the outer peripheral surface thereof so as to be substantially vertical. . As shown in FIG. 4, the litz wire 3a has a coating film 3b made of, for example, a waterproof epoxy resin, and a film is formed on the surface to secure the insulation by fixing the wires.

  Around the heating coil 3, there is provided a nonmagnetic metal case 7 for the purpose of electrical and magnetic shielding of the heating coil 3, and the heating coil 3 is cooled on the lower side surface of the nonmagnetic metal case 7. A cooling fan 8 is provided.

  Further, the nonmagnetic metal case 7 covers the lower surface of the base 7 b fixed to the outer frame 30, the substantially U-shaped cover 7 a covering the periphery of the heating coil 3, and the nonmagnetic cylinder 2 penetrating part. The bottom plate 7c is configured so that the cover 7a is joined to the base 7b with screws 7d so as to be integrally joined.

  The cooling fan 8 is attached to the cover 7a above the bottom plate 7c, and sucks outside air from an air inlet 31 provided in the outer frame 30 so as to be substantially opposed to the suction side of the cooling fan 8 to be a nonmagnetic material. After flowing between the metal case 7 and the heating coil 3 wound around the outer peripheral surface of the nonmagnetic cylinder 2 and cooling the heating coil 3, the outer frame is somewhat below the upper surface opening of the nonmagnetic metal case 7. It is discharged out of the outer frame 30 through an exhaust port 32 provided in 30.

A space formed between the nonmagnetic metal case 7 and the heating coil 3 and a path from the space to the exhaust port 32 of the outer frame 30 constitute a first air duct 35, and the exhaust port 32. Is provided somewhat below the opening on the top surface of the nonmagnetic metal case 7 to prevent water from entering the first air duct 35.

The substrate unit 20 that controls the energization operation of the heating coil 3 is disposed in an appropriate space position in the outer frame 30, is waterproofed with a filling material such as potting, and the terminal 21 of the litz wire 3a of the heating coil 3 is Connected and supplied with power. A cooling fan 22 for cooling the substrate is provided below the substrate unit 20, and outside air is sucked from a substrate intake port 33 provided at the lower portion of the outer frame 30, and a substrate unit is discharged from a substrate exhaust port 34 provided at the upper portion. Exhaust after 20 cooling is discharged. And the 2nd airflow duct 36 is comprised by these cooling paths.

  In FIG. 2, there is a certain space between the non-magnetic cylinder 2 around which the heating coil 3 is wound and the water pipe 1 through which water flows, and the concentricity is maintained by a concentric plate 4 interposed in the space. Further, the portion of the water pipe 1 facing the heating coil 3 serves as a heating surface 1 a, and both ends of the water pipe 1 protrude above and below the both ends of the nonmagnetic cylinder 2.

  A concentric plate 4 that maintains the concentricity interposed between the non-magnetic cylinder 2 and the water pipe 1 around which the heating coil 3 is wound is provided with a notch 4a and a supporting portion along the circumferential direction at the contact with the water pipe 1 4b are alternately provided, and dew condensation water 41 adhering to the surface of the water pipe 1 flows down from the notch 4a.

  In FIG. 3, the non-magnetic cylinder 2 is provided with a winding start plate 5 for fixing the winding start position and the winding end position of the heating coil 3. The winding start plate 5 starts winding with fixing the lead portion of the litz wire 3a, and fixes the lead portion of the litz wire 3a.

  Further, the winding start plate 5 is supported by fitting the left and right outer portions into the concave portions of the coil support portion 6, and by holding the coil support portion 6 with a nonmagnetic metal case 7, a nonmagnetic material is provided. The metal case 7 is attached at a predetermined position.

In FIG. 5, the pipe support 9 for fixing the water pipe 1 to the outer frame 30 takes into consideration the thermal expansion of the water pipe 1 and the upper base 9 a and the upper base 9 a as shown in FIG. The cover 9b is loosely held with respect to the diameter of the water pipe 1 and holds a gap 9e that is not restricted by vertical and horizontal movements. Further, in the lower pipe support portion 9, as shown in (b), the step 1b of the water pipe 1 is restrained by the lower base 9c and the lower cover 9d to fix the vertical movement and fall prevention.

  The present invention has the above configuration, and the operation thereof will be described next.

  The water supplied from the water pipe 42 to the connection pipe 13 flows into the water pipe 1 from the lower side of the water pipe 1 and is heated by the heating coil 3 wound around the non-magnetic cylinder 2 around the water pipe 1. From the upper part, it reaches the outlet pipe 12 and flows out as hot water from the outlet 12a with a faucet.

  On the other hand, when the cooling fan 8 is driven, outside air is sucked from the air inlet 31 provided in the outer frame 30 to the outer peripheral surfaces of the nonmagnetic metal case 7 and the nonmagnetic cylinder 2 constituting the first air duct 35. After flowing into the wound heating coil 3 and cooling the heating coil 3, it is directed downward from the upper surface opening of the non-magnetic metal case 7 against the upper surface of the outer frame 30, and turns downward through the exhaust port 32. Released outside.

  Also, by driving the other cooling fan 22, the outside air is sucked from the substrate intake port 33, the substrate unit 20 that controls the energization operation of the heating coil 3, the terminal 21 of the litz wire 3a, and the like are cooled, and their temperature rises. And the air is discharged from the second air duct 36 to the outside of the outer frame 30 through the substrate exhaust port 34.

  When adjusting the hot water temperature, the amount of power supplied to the heating coil 3 from the substrate unit 20 that controls the energization operation of the heating coil 3 is adjusted, or the inflow amount of water from the water pipe 42 and the outlet with a faucet The amount of hot water flowing out from 12a is adjusted to obtain the desired hot water temperature.

  According to the present invention, the non-magnetic cylinder 2 around which the heating coil 3 is wound is longer than the diameter, and the vertically long heating coil 3 is arranged substantially vertically. On the other hand, if water is moved from below, bubbles are not accumulated due to overheating, and there is no portion where the heating coil 3 is not soaked in water, and abnormal heating does not occur.

  Further, the non-magnetic cylinder 2 wound with the heating coil 3 and the water pipe 1 are arranged concentrically while maintaining a certain gap, and both ends of the water pipe 1 are placed outside the both ends of the non-magnetic cylinder 2. The heat generation state can be kept constant, the performance is stable, the pipe support portion 9 can be provided outside the magnetic field range of the heating coil 3, and the pipe support portion 9 does not cause heat shrinkage, Water leakage such as cracks can be prevented.

  Further, a concentric plate 4 is provided between the non-magnetic cylinder 2 wound with the heating coil 3 and the water pipe 1 so as to maintain concentricity, and a contact portion of the concentric plate 4 with the water pipe 1 is notched along the circumferential direction. Since a plurality of portions 4a are provided, the condensed water on the surface of the water pipe 1 flows down through the notched portion 4a, and a large amount of condensed water adheres to the surface of the water pipe 1 due to repeated heating and cooling with tap water. Also, the insulation of the heating coil 3 can be secured, and the condensed water can be discharged smoothly.

  In addition, the water pipe 1 for flowing water by connecting to the water pipe 42 and the pipe support portion 9 for fixing the water pipe 1 to the outer frame 30 are connected to the lower pipe support portion 9 in consideration of the thermal expansion of the water pipe 1. Since the water pipe 1 is fixed to prevent vertical movement and fall, and the upper pipe support 9 does not restrain the vertical and horizontal movements, the gap 9e is provided, so that thermal expansion occurs in the fixing part to the outer frame 30. The stress of expansion that may occur can be relieved.

  Further, the non-magnetic cylinder 2 is provided with two winding start plates 5 for fixing the start and end positions of the heating coil 3, and the drawing portion of the litz wire 3 a is fixed to one of the winding start plates 5 and wound. At the beginning and at the end of winding, the lead-out portion of the litz wire 3a is fixed to the other winding start plate 5, and the two winding start plates 5 are held by the coil support portion 6, and the coil support portion 6 is non-magnetic metal Since it is fixed to the case 7, it can be heated without moving the heating coil 3, and can be fixed to the outer frame 30, so that stable performance can be obtained.

  Further, since the nonmagnetic metal case 7 is composed of the base 7b fixed to the outer frame 30 and the cover 7a covering the periphery of the heating coil 3, radio waves leak from the outer periphery of the heating coil 3 energized with high-frequency power. It is possible to suppress abnormal radio waves from flooding other general electric products.

  Further, an intake port 31 is provided in the outer frame 30 of the heating coil 3 facing the cooling fan 8, and an exhaust port 32 is provided in the outer frame 30 below the upper surface opening of the nonmagnetic metal body case 7. Since the first air duct 35 is formed in the space formed between the metal case 7 and the heating coil 3 and the path from this space to the exhaust port 32, the heat of the heating coil 3 is taken away by forced cooling by the cooling fan 8. The warm air is smoothly raised by the natural flow from the bottom to the top, reaches the exhaust port 32 of the outer frame 30 from the opening on the top surface of the nonmagnetic metal case 7, and cools the heating coil 3 efficiently. In addition, the performance is stable with the power saving type, and it is possible to prevent the heating coil 3 from condensing or splashing water, and the safety of electrical insulation can be ensured regardless of the waterproof structure of the outer frame 30.

Further, the heating coil 3 wound around the non-magnetic cylinder 2 is composed of a litz wire 3a, and the surface of the litz wire 3a is fixed by forming a film with a coating material 3b to ensure insulation. Prevents malfunction of electrical, magnetic shielding, and electronic parts, ensuring safety.

  As described above, the present invention can provide an easy-to-use and safe electric hot water heating unit that can be connected to water and supplied with hot water by high frequency electromagnetic induction heating.

1 is a structural cross-sectional view of an electric hot water heating unit according to an embodiment of the present invention. It is a structure sectional view of a water pipe and a heating coil concerning one example of the present invention. It is a support part structure sectional view of a heating coil concerning one example of the present invention. It is a structure sectional view of the heating coil concerning one example of the present invention. FIG. 4A is a structural diagram of a support portion in an upper part of a water pipe and FIG. 5B is a lower part of the water pipe according to an embodiment of the present invention. It is sectional drawing of the structure of the conventional water heater.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pipe 2 Nonmagnetic cylinder 3 Heating coil 3a Litz wire 3b Coating material 4 Concentric plate 4a Notch part 4b Support part 5 Winding start plate 6 Coil support part 7 Nonmagnetic metal case 8 Cooling fan 9 Pipe support part 9a Upper base 9b Upper cover 9c Lower base 9d Lower cover 10 Joint lower 11 Joint upper 12 Exit pipe 13 Connection pipe 20 Substrate unit 22 Cooling fan 30 Outer frame 31 Inlet 32 Exhaust 35 First air duct 36 Second air duct 42 Water supply tube

Claims (8)

  A water pipe connected to the water pipe, a non-magnetic cylinder arranged around the water pipe, a heating coil wound around the outer surface of the non-magnetic cylinder, and a pipe support for fixing the water pipe and the heating coil to the outer frame And a coil support, a nonmagnetic metal case fixed to the outer frame and disposed around the heating coil, a cooling fan for cooling the heating coil provided in the nonmagnetic metal case, and energization of the heating coil An electric hot water heating unit comprising a substrate unit for controlling the substrate, a cooling fan for cooling the substrate provided in the substrate unit, and an outlet pipe connected to the hot water outlet side of the water pipe. An electric hot water heating unit characterized in that the length is longer than the diameter, and the heating coil is arranged vertically so that the heating coil is vertically arranged on the outer peripheral surface thereof.   The non-magnetic cylinder wound with a heating coil and the water pipe are arranged concentrically while maintaining a certain gap, and both ends of the water pipe are extended outward from both ends of the non-magnetic cylinder. The electric hot water heating unit according to claim 1.   A concentric plate that maintains concentricity is provided between the non-magnetic cylinder around which the heating coil is wound and the water pipe, and a plurality of notches along the circumferential direction are provided at the contact portion of the concentric plate with the water pipe. 3. The electric hot water heating unit according to claim 1, wherein the dew condensation water on the surface of the water pipe flows down through the portion.   The electric hot water heating unit according to claim 1, wherein the water pipe is fixed by a lower pipe support portion and is held with a gap formed by an upper pipe support portion.   The non-magnetic cylinder is provided with two winding start plates for fixing the winding start position and the winding end position of the heating coil, the litz wire lead portion is fixed to one of the winding start plates, and the winding end portion is also connected to the other end. An electric hot water according to any one of claims 1 to 4, wherein a litz wire lead portion is fixed to the winding start plate, the two winding start plates are held by a coil support portion, and the coil support portion is fixed to a nonmagnetic metal case. Heating unit.   6. The electric hot water heating unit according to claim 1, wherein the non-magnetic metal case is formed by integrally joining a base fixed to the outer frame and a cover covering the periphery of the heating coil.   The non-magnetic metal case covers the bottom surface with a bottom plate, and a cooling fan is attached to the side surface above the bottom plate, and an air inlet is provided in the outer frame facing the cooling fan. An exhaust port is provided in the outer frame on the side, and a first air duct is configured in a space formed between the intake port and the non-magnetic metal case and the heating coil and a path from the space to the exhaust port. The electric hot water heating unit according to claim 1.   The electric coil according to any one of claims 1 to 7, wherein a heating coil wound around a non-magnetic cylinder is composed of a litz wire, and a surface of the litz wire is formed and fixed with a coating material to ensure insulation. Hot water heating unit.

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