JP2008281287A - Electric continuous water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric continuous water heater with extremely excellent electric heating efficiency. <P>SOLUTION: This water heater is provided with a first coil 1 and a second coil 2 in which lengthy conductive circular tubes 3 are respectively wound in spiral shapes to be arranged on approximately virtual flat faces. The first coil 1 and the second coil 2 are arranged approximately in parallel at a predetermined interval. The first coil 1 and second coil 2 are wound so that high frequency currents flow approximately simultaneously in a same direction, and are electrically connected. Thereby, a heating tube 12 as a heating member heated by induction in a state of being in thermally contact with water flowing a flow channel 17 for distributing the water is existing in an induction heating region 7 sandwiched between the first coil 1 and the second coil 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric continuous water heater that realizes efficient heating.

  As for the water heater, there are gas type and electric type conventionally. The characteristic of the gas type is the maximum heating power at the same time as ignition, and the relatively thin pipe through which water passes and the fins connected to it are heated directly, so the reaction is significantly faster than the conventional electric type, so-called It is said to be an instant water heater.

  Such a gas-type instantaneous water heater can continuously heat the water passing through the pipe to a hot water temperature that can be used, eliminating the need for a hot water storage tank and obtaining a large capacity with a small body. Can do. In addition, the absence of a hot water storage tank leads to fresh hot water to be used, which is also a great advantage.

  However, since gas requires oxygen when combusted, it requires a larger amount of air when used indoors than an electric type that does not require air at all. Neglecting this will cause poisoning and gas explosion accidents due to incomplete combustion. In addition, moisture generated by gas combustion increases indoor humidity and is one of the causes of mold and bacteria. In addition, ventilation by air conditioning equipment has resulted in increased costs for air conditioning.

  In general, an electric water heater is a system in which a sheathed heater is directly inserted into a hot water storage tank to heat the water in the tank (for example, a midnight-powered water heater). In this case, since it takes too much time for electricity to flow through the heater and reach the temperature at which the water in the tank can be used, it is necessary to warm the water in the tank to a temperature that can be used in advance. For this reason, there is a limit to the amount of hot water that can be used at one time, and it is necessary to wait for a certain period of time until it can be used next time. In addition, the time delay from when the current flows through the sheathed heater until the maximum heat exchange with the water cannot be ignored is a so-called dull rise.

  In order to improve these, some have been devised such as double the structure in the tank to reduce the amount of hot water around the heater, but it has not yet reached continuous hot water supply. Therefore, at present, it is a fact that a certain amount of continuous hot water supply is realized by increasing the amount of hot water heated to a high temperature. Has the problem of becoming larger. Moreover, since it is necessary to cover the storage tank with a thick heat insulating layer, the apparatus is further increased in size, and even if it is covered with a thick heat insulating layer, the release of heat from the storage tank is inevitable, and the energy efficiency is reduced accordingly. Is the actual situation.

  On the other hand, induction heating is one of the electric heating methods. Induction heating is based on the principle that when an alternating current is passed through a heating coil, an alternating magnetic flux is generated, an induction current flows through a conductive heating material placed nearby, and heat is generated by the Joule heat. The shape of the heating coil and the arrangement of the heating material in such induction heating have conventionally been variously used for various industrial purposes.

For example, the electric instantaneous water heater of the following patent document 1 is proposed as what heats the liquid which flows through a metal pipe by induction heating. The electric instantaneous water heater described in Patent Document 1 is arranged in the vicinity of a flat heating coil to which a high frequency is applied, and the heating coil, and the opposed surfaces of the heating coil are flat and meandering inside. And a conductive heating part in which a water passage is formed. In this way, when a high frequency is applied to the heating coil, an alternating magnetic flux is generated in the heating part by induction heating, and an induction current flows in the conductive heating part, particularly the opposite surface, placed nearby, The heating part generates heat due to the Joule heat. The heat heats the water passing through the internal water passage. Hot water is continuously obtained from the hot water outlet of the heating section at a temperature calculated from the amount of water flow, the length of the water passage, the input power to the heating coil and the efficiency.
Japanese Utility Model Publication No. 5-79344

  However, in the instant water heater of the above-mentioned Patent Document 1, since the heating unit having a water passage is arranged on one side of one flat heating coil, there is a limit to the induced current generated thereby, There is a limit to the induction efficiency. It is also conceivable that a pair of flat heating coils face each other symmetrically, but when a high-frequency current is applied to two flat heating coils, the currents that flow simultaneously in the respective flat heating coils are swirled with each other. It will flow in the opposite direction. For this reason, since the directions of the magnetic fields generated simultaneously by the two flat heating coils are in a direction in which they cancel each other, the magnetic field is weakened as a whole, and the induced current generated by the magnetic field is also reduced. The heating efficiency with respect to becomes extremely small.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electric continuous water heater that is extremely excellent in electric heating efficiency.

  In order to achieve the above object, the electric continuous water heater of the present invention includes a first coil and a second coil wound in a spiral shape so that each of the long conductive members is arranged on a virtual plane. A first coil and a second coil are arranged substantially in parallel at a predetermined interval, and the first coil and the second coil have high-frequency currents flowing in the same direction at substantially the same time. And is electrically connected to the induction heating region sandwiched between the first coil and the second coil. The gist of the present invention is that there is a heating member that is induction-heated in a state of being in contact with.

  In the electric continuous water heater of the present invention, the first coil and the second coil wound in a spiral shape so that each of the long conductive members are arranged on a virtual plane are separated from each other by a predetermined interval. Since the first coil and the second coil are wound so that the high-frequency current flows in the same direction in the same direction and are electrically connected to each other, the first and second coils are arranged substantially in parallel. Since a current in the same direction flows through the first and second coils simultaneously when a high frequency current is passed through the two coils, a magnetic field in the same direction is simultaneously formed around the conductive members forming the first and second coils. And a strong magnetic flux in one direction is simultaneously formed between the two spiral coils. In this state, the induction heating region sandwiched between the first coil and the second coil is guided in a state in which the water flows and the water flowing through the flow channel is in thermal contact with the induction heating region. Due to the presence of the heating member to be heated, the strong magnetic flux is alternately switched, so that the heating member is heated by generating a strong induced current, and the water that is in thermal contact with the heating member is heated. The Thus, water can be heated by induction heating that is extremely excellent in heating efficiency with respect to power consumption. In addition, a region sandwiched between the first coil and the second coil wound in a spiral shape so that the long conductive member is generally arranged on a virtual plane is formed in the induction heating region. The water can be heated by uniformly heating a wide area.

  In the present invention, the flow path is formed so that the introduction path for introducing water into the induction heating area, the discharge path for discharging water from the induction heating area, the branch from the introduction path is parallel, and terminates in the discharge path. In the case of being configured to include a plurality of parallel paths provided, the water introduced from the introduction path is heated while being divided into a plurality of parallel paths, so that the heating efficiency is further improved.

  In the present invention, a plurality of hot water units including the first coil, the second coil, the flow path, and the heating member are provided, and the water heated by the first hot water unit is used as the second hot water. When it is configured to further heat with the boiling unit, the heating efficiency is further improved because heating is performed in a plurality of stages with the plurality of boiling water units.

  In this invention, when it is comprised so that a steam may be produced | generated by using the semiconductor ceramic which has circulation holes, such as water, as a heating member in a 2nd water heater unit, water is simply heated as water heater. Not only can it be used, it can generate steam and superheated steam.

  In the present invention, the induction heating region is formed as a region sandwiched between plates made of a non-magnetic material, and the first coil and the second coil are provided along the plate, respectively. The conductive members constituting the first and second coils are accurately arranged on a virtual plane to form a parallel spiral, and the magnetic flux generated between the first coil and the second coil is less disturbed. Efficient and uniform heating is possible. Further, since the plate is made of a non-magnetic material, the plate itself is not heated by an induced current, and heating efficiency is not reduced.

  In the present invention, when the first coil and the second coil are provided outside the plate formed of the non-magnetic material, the heating coil is heated in the induction heating region. Since the space between the first and second coils is shielded by a plate that is not induction-heated, the heat of the object to be heated is prevented from radiating to the first and second coils, and the first and second coils are protected from the heat. Is done. Further, the heating member is prevented from coming into contact with the first and second coils, and the first and second coils are protected.

  In the present invention, when the first coil and the second coil are wound in a spiral shape with an equal interval, the magnetic field generated in the induction heating region becomes uniform, thereby realizing more uniform heating. be able to. Furthermore, in the present invention, when the spiral pitch of the first coil and the spiral pitch of the second coil are equal, the magnetic field generated in the induction heating region becomes more uniform, and more uniform heating. Can be realized.

  Next, the best mode for carrying out the present invention will be described.

  FIG. 1 is a diagram showing a high-frequency induction heating device used in the electric continuous water heater of the present invention.

  This high-frequency induction heating apparatus includes a first coil 1 and a second coil 2 in which a conductive circular tube 3 that is a long conductive member is wound in a spiral shape. Each of the first coil 1 and the second coil 2 is provided along a plate 4 made of a heat-resistant nonmagnetic material, and is wound so that the conductive circular tube 3 is disposed on a virtual plane. Yes. The two plates 4 are arranged in parallel at a predetermined interval, and the first coil 1 and the second coil 2 are also arranged in parallel at a predetermined interval. As the material of the plate 4, for example, ceramics or heat-resistant glass can be used.

  The first coil 1 and the second coil 2 are provided outside a plate 4 made of the nonmagnetic material. The first coil 1 and the plate 4 constitute a first coil unit 6a, and the second coil 2 and the plate 4 constitute a second coil unit 6b. A region sandwiched between the first coil unit 6 a and the second coil unit 6 b, that is, a region sandwiched between the first coil 1 and the second coil 2 is formed in the induction heating region 7.

  The first coil 1 and the second coil 2 are wound so that high-frequency currents flow in the same direction at the same time, and are electrically connected.

  That is, in this example, the first coil 1 is wound in a right-handed spiral shape from the center portion toward the outside as viewed from the outside of the plate 4. On the other hand, when viewed from the outside of the plate 4, the second coil 2 is wound in a left-handed spiral shape from the center to the outside, and when viewed from the inside of the plate 4, the same as the first coil 1. Is wound in a right-handed spiral shape from the center to the outside.

  Then, the conductive circular tube 3a that forms the outermost spiral of the first coil 1 and the conductive circular tube 3b that forms the innermost spiral of the second coil 2 are electrically connected, and the first coil 1 The conductive circular tube 3c that forms the inner spiral is electrically connected to the conductive circular tube 3d that forms the outermost spiral of the second coil 2.

  A high frequency power source 5 is connected between the first coil 1 and the second coil 2 so that currents in the same direction flow through the first coil 1 and the second coil 2 almost simultaneously. Energized.

  That is, when a high frequency current is applied from the high frequency power source 5, a current whose polarity changes alternately flows, but when a current of one polarity flows, the first coil 1 and the second coil 2 have the same direction. When the other current flows and the other polarity current flows, the directions are reversed, but currents in the same direction flow in the first coil 1 and the second coil 2, respectively.

  Specifically, in one polarity, for example, as shown in FIG. 1, the first coil 1 has a right-handed spiral current from the center toward the outside as viewed from the outside of the plate. The second coil 2 has a left-handed spiral shape from the center to the outside when viewed from the outside of the plate 4, and the same center as the first coil 1 when viewed from the inside of the plate 4. A right-handed spiral current flows from the portion toward the outside.

  When the polarity is switched, as shown in FIG. 4, a left-handed spiral current flows from the outside toward the center of the first coil 1 as seen from the outside of the plate. 2 is a right-handed spiral shape from the outside toward the center as viewed from the outside of the plate 4, and when viewed from the inside of the plate 4, the same as the first coil 1 from the outside toward the center. A left-handed spiral current flows.

  Thus, when viewed from one direction (outside the plate 4), currents in the same direction simultaneously flow in the first coil 1 and the second coil 2.

  By the high frequency induction heating device, for example, high frequency induction heating is performed as follows.

  That is, when the polarity is shown in FIG. 1, as shown in FIG. 2, a right-handed spiral current flows through the first coil 1 from the center toward the outside as seen from the outside of the plate. The second coil 2 has a left-handed spiral shape from the center to the outside as viewed from the outside of the plate 4, and from the same center as the first coil 1 when viewed from the inside of the plate 4. A right-handed spiral current flows toward the outside.

  At this time, a magnetic field is generated around the conductive tube 3 forming the first coil 1 in accordance with the right-handed screw law. As shown in FIG. 3, this magnetic field becomes a magnetic flux from the outside of the first coil 1 toward the center and from the outside of the plate 4 to the inside. On the other hand, a magnetic field is also generated around the conductive tube 3 forming the second coil 2 in accordance with the right-handed screw law, and the magnetic flux is directed from the center of the second coil 2 to the outside and from the inside to the outside of the plate 4. Become.

  And the 1st coil 1 and the 2nd coil 2 which were wound in the shape of a spiral so that each elongate conductive tube 3 may be arranged on a virtual plane are arranged almost in parallel at a predetermined interval. From the inside of the first coil 1 to the inside of the second coil 2 between the first coil 1 and the second coil 2 with the centers of the first coil 1 and the second coil 2 as axes, After passing through the two coils 2, a magnetic field of magnetic field lines returning from the outside of the second coil 2 to the outside of the first coil 1 is generated.

  As described above, since currents in the same direction simultaneously flow through the first coil 1 and the second coil 2, a magnetic field in the same direction is simultaneously formed around the conductive circular tube 3 forming the first coil 1 and the second coil 2. As a result, a strong magnetic flux in one direction is simultaneously formed between the first coil 1 and the second coil 2.

  When the polarity is switched to the polarity shown in FIG. 4, as shown in FIG. 5, the first coil 1 has a left-handed spiral shape from the outside toward the center as seen from the outside of the plate. Current flows in the second coil 2 when viewed from the outside of the plate 4 in a right-handed spiral shape from the outside toward the center, and when viewed from the inside of the plate 4, the first coil 1. A left-handed spiral current flows from the outside toward the center as in FIG.

  At this time, a magnetic field is generated around the conductive tube 3 forming the first coil 1 in accordance with the right-handed screw law. As shown in FIG. 6, this magnetic field becomes a magnetic flux from the center side of the first coil 1 toward the outside and from the inside to the outside of the plate 4. On the other hand, a magnetic field is also generated around the conductive circular tube 3 forming the second coil 2 in accordance with the right-handed screw law. The magnetic flux is directed from the outside to the center of the second coil 2 and from the outside to the inside of the plate 4. Become.

  And the 1st coil 1 and the 2nd coil 2 which were wound in the shape of a spiral so that each elongate conductive tube 3 may be arranged on a virtual plane are arranged almost in parallel at a predetermined interval. From the inside of the second coil 2 to the inside of the first coil 1 between the first coil 1 and the second coil 2, the center of the first coil 1 and the second coil 2 is an axis, After passing through one coil 1, a magnetic field of magnetic field lines returning from the outside of the first coil 1 to the outside of the second coil 2 is generated.

  In this way, even when the polarity is reversed, currents in the same direction simultaneously flow through the first coil 1 and the second coil 2, and therefore, around the conductive tube 3 that forms the first coil 1 and the second coil 2. At the same time, a magnetic field in the same direction is generated, and a strong magnetic flux in one direction (the direction opposite to the state of FIGS. 1 to 3) is simultaneously formed between the first coil 1 and the second coil 2.

  FIG. 7 is a block diagram showing an embodiment of the electric continuous water heater of the present invention.

  The electric continuous water heater has a flow path 17 through which water flows in the induction heating region 7 sandwiched between the first coil unit 6 a and the second coil unit 6 b described above, and water flowing through the flow path 17. And a heating tube 12 as a heating member that is induction-heated in a state of being in thermal contact with each other. A hot water unit 8 is constituted by the first coil unit 6 a provided with the first coil 1, the second coil unit 6 b provided with the second coil 2, and the heating tube 12 having the flow path 17.

  In this state, by applying a high-frequency current to the first coil 1 and the second coil 2, the polarity shown in FIGS. 1 to 3 and the polarity shown in FIGS. Are alternately switched, and a strong magnetic flux is alternately switched, so that the heating tube 12 is heated by generating a strong induced current.

  FIG. 8 is a view showing an example of the heating tube 12. In FIG. 8A, the heating tube 12 itself is formed of a heating member which is a conductor such as metal or a semiconductor heating element such as SiC. The heating tube 12 itself generates heat by induction heating and flows inside. The water flowing through the passage 17 is heated. FIG. 8B shows that the heating tube 12 itself is made of an insulating material such as insulating ceramics, and is made of a conductive material such as metal or a semiconductor such as SiC so as to be in contact with water flowing through the internal flow path 17. The heating element 18 as a member is present, and the heating tube 12 itself does not generate heat, but the heating element 18 generates heat by induction heating and heats the water flowing through the flow path 17.

  The heating pipe 12 communicates with an introduction pipe 10 for introducing water to be heated at one end on the introduction side, and a discharge pipe 11 for discharging heated water at the other end on the discharge side. . Accordingly, the flow path 17 is configured to include an introduction path for introducing water into the induction heating area 7 and a discharge path for discharging water from the induction heating area 7. The heating tube 12 is disposed so as to meander along the first coil unit 6 a and the second coil unit 6 b in the induction heating region 7.

  The introduction pipe 10 is connected to a water supply source (not shown) and is provided with a flow rate detector 14 for detecting the flow rate of water flowing through the introduction pipe 10. Further, the discharge pipe 11 is provided with a valve 13, and water is introduced and circulated from the introduction pipe 10 into the heating pipe 12 by opening and closing the valve 13, and is discharged from the discharge pipe 11.

  The flow rate of water discharged from the discharge pipe 11, that is, the flow rate of water introduced from the introduction pipe 10 is changed depending on the opening degree of the valve 13. At this time, the flow rate of water flowing through the introduction pipe 10 is detected by the flow rate detector 14 and a detection signal is output to the control device 16. On the other hand, this electric continuous water heater is provided with a temperature setting device 15 using, for example, a variable resistor, and inputs a user's desired temperature setting input signal to the control device 16.

  When the valve 13 is opened and the flow rate detector 14 detects that water has flowed through the introduction pipe 10, the control device 16 receives the detection signal and starts outputting the high-frequency power source 5. At this time, abnormal heating of the heating pipe 12 is prevented so as to ensure safety by not starting the output of the high-frequency power supply 5 until the flow rate of the water flowing in the introduction pipe 10 reaches a predetermined value or more. .

  Then, the temperature setting signal is received from the flow rate detector 14 in response to the detection signal of the flow rate of the water flowing through the introduction pipe 10, that is, the heating pipe 12, and the temperature setting input signal from the temperature setting unit 15. The output voltage of the high frequency power source 5 is controlled so that water is heated to the set temperature at 15. As a result, water having a desired set temperature is obtained at a desired flow rate.

  Even when the opening degree of the valve 13 changes and the flow rate of water flowing through the heating pipe 12 changes, the output voltage of the high-frequency power source 5 is controlled so that the water at the flow rate is heated to a predetermined set temperature. Even when the set temperature in the temperature setter 15 is changed, the output voltage of the high-frequency power source 5 is controlled so as to be heated to a predetermined set temperature. At this time, when the flow rate of the water flowing through the introduction pipe 10 becomes a predetermined value or less, the output of the high-frequency power source 5 is stopped to prevent the heating pipe 12 from being abnormally heated and to ensure safety. When the valve 13 is closed, a detection signal indicating that water has stopped flowing through the introduction pipe 10 is received from the flow rate detector 14 and the output of the high-frequency power source 5 is stopped.

  As described above, the electric continuous water heater of the present embodiment has the same direction in the first and second coils 1 and 2 when a high-frequency current is applied to the first and second coils 1 and 2. Since a current flows, a magnetic field in the same direction is generated around the conductive tube 3 forming the first and second coils 1 and 2 at the same time, and a strong force in one direction is simultaneously generated between the two spiral coils. Magnetic flux is formed. In this state, the induction heating region 7 sandwiched between the first coil 1 and the second coil 2 is induction heated in a state of being in thermal contact with the water flowing through the flow path 17 through which the water flows. As a result of the presence of the heating tube 12 as a heating member, the strong magnetic flux is alternately switched, whereby the heating tube 12 is heated by generating a strong induction current and is in thermal contact with the heating tube 12. The heated water is heated. Thus, water can be heated by induction heating that is extremely excellent in heating efficiency with respect to power consumption. Further, the induction heating region 7 is formed with a region sandwiched between the first coil 1 and the second coil 2 wound in a spiral shape so that the conductive circular tube 3 is generally arranged on a virtual plane. Therefore, it becomes possible to heat water by uniformly heating a wide area.

  Further, the induction heating region 7 is formed as a region sandwiched between plates 4 made of a nonmagnetic material, and the first coil 1 and the second coil 2 are provided along the plate 4 respectively. The conductive circular tubes 3 constituting the first and second coils are accurately arranged on a virtual plane to form a parallel spiral shape, and the magnetic flux disturbance generated between the first coil 1 and the second coil 2 is reduced. Thus, more efficient and uniform heating becomes possible. Further, since the plate 4 is made of a nonmagnetic material, the plate 4 itself is not heated by an induced current, and heating efficiency is not lowered.

  Further, since the first coil 1 and the second coil 2 are provided outside the plate 4 made of the nonmagnetic material, the first coil 1 and the second coil 2 are present in the induction heating region 7 and are heated and the first object to be heated. Since the space between the coil 1 and the second coil 2 is shielded by the plate 4 that is not induction-heated, the heat of the object to be heated is prevented from being radiated to the first coil 1 and the second coil 2, and the first coil 1 and The second coil 2 is protected from heat. Moreover, it is prevented that a heating target object contacts the 1st coil 1 and the 2nd coil 2, and the 1st coil 1 and the 2nd coil 2 are protected.

  In addition, a region sandwiched between the first coil 1 and the second coil 2 wound in a spiral shape so that the long conductive tube 3 is generally arranged on a virtual plane is an induction heating region 7 of the heating object. Therefore, a wide area can be heated uniformly. In particular, by winding the first coil 1 and the second coil 2 in a spiral shape with equal intervals, the magnetic field generated in the induction heating region 7 becomes uniform, and more uniform heating can be realized. it can. At this time, by making the spiral pitch of the first coil 1 and the spiral pitch of the second coil 2 equal to each other, the magnetic field generated in the induction heating region 7 becomes more uniform, and more uniform heating is realized. be able to.

  FIG. 9 shows a second embodiment of the electric continuous water heater of the present invention.

  In this example, the heating pipe 12 constituting the water heating unit 8 is provided so as to branch from the introduction pipe 10 that forms the introduction path in parallel and terminate in the discharge pipe 11 that forms the discharge path. A plurality of parallel pipes 19 are formed.

  More specifically, in this example, four parallel pipes 19 are provided, and are arranged in parallel along the first coil unit 6 a and the second coil unit 6 b in the induction heating region 7. The introduction side end of each parallel pipe 19 communicates with the introduction side connecting pipe 20a arranged in the vertical direction, and the introduction pipe 10 is connected to the introduction side connecting pipe 20a. The discharge side end communicates with the discharge side connecting pipe 20b arranged in the vertical direction, and the discharge pipe 11 is connected to the discharge side connecting pipe 20b.

  Thereby, since the water introduced from the introduction pipe 10 is heated while being divided into a plurality of parallel pipes 19 and distributed, the heating efficiency is further improved. Other than that, it is the same as that of the said embodiment, and there exists the same effect.

  FIG. 10 shows a third embodiment of the electric continuous water heater of the present invention.

  As shown in FIG. 10 (A), the present embodiment includes a plurality of units (two in this example) of water heater units 8a and 8b, and the water heated by the first water heater unit 8a is used as the second water heater. The unit 8b is further heated. The discharge pipe 11a of the first hot water unit 8a and the introduction pipe 10b of the second hot water unit 8b are connected, and water is introduced from the introduction pipe 10a to the first hot water unit 8a, heated and discharged. It discharges | emits from the pipe | tube 11a, water is introduce | transduced into the 2nd hot-water unit 8b from the introductory pipe | tube 10b, is further heated, and is discharged | emitted from the exhaust pipe 11b.

  In this example, what has the parallel pipe | tube 19 is employ | adopted as the heating pipe | tube 12 demonstrated in FIG. And the heat generating body 22 which consists of a silicon carbide block which has the distribution holes 23, such as water, is used as a heating member in the 2nd hot water unit 8b.

  More specifically, as shown in FIG. 10 (B), the second hot water unit 8b includes a rectangular parallelepiped heating container 21 having an introduction pipe 10b connected to one end and a discharge pipe 11b connected to the other end. A heating element 22 accommodated in the heating container 21 is provided.

  The heating element 22 is composed of a sintered body of silicon carbide, which is a semiconductor ceramic in this example. And the said heat generating body 22 is formed in the rectangular parallelepiped shape which can be accommodated in the heating container 21, and is set so that a longitudinal direction dimension may become shorter than the heating container 21. FIG. The heating element 22 is fixed in the heating container 21 so that buffer spaces 24 are formed on the introduction side and the discharge side of the heating container 21, respectively. The heating element 22 has a plurality of flow holes 23 through which water and steam are circulated by penetrating from the introduction side end toward the discharge side end.

  By doing in this way, since it heats in a plurality of stages with a plurality of hot water units, the heating efficiency is further improved. In addition to simply heating water and using it as a kettle, steam can be generated or superheated steam can be generated. Other than that, it is the same as that of the said embodiment, and there exists the same effect.

  In this embodiment, both the first water heater unit 8a and the second water heater unit 8b are of the same type as shown in FIG. 9 and heat the water in a multistage manner rather than generating steam. It can also be.

  As described above, the electric continuous water heater of the present invention can be used as a water heater, a steamer, a superheated steam generator, or the like.

It is a block diagram which shows the high frequency induction heating apparatus used for the electric continuous water heater of this invention. It is a figure explaining an effect | action when the electric current of one polarity flows. FIG. 3 is a cross-sectional view taken along the line A-A ′ in the state of FIG. 2. It is a figure explaining a state when the electric current of the other polarity flows. It is a figure explaining an effect | action when the said other polarity electric current flows. It is A-A 'sectional drawing of the state of FIG. It is a schematic block diagram of the electric continuous water heater of this invention. It is a figure which shows an example of a heating tube. It is a figure which shows the 2nd example of a hot water unit. It is a figure which shows the example which connected multiple hot water units.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st coil 2 2nd coil 3 Conductive circular tube 3a Conductive circular tube 3b Conductive circular tube 3c Conductive circular tube 3d Conductive circular tube 4 Plate 5 High frequency power supply 6a 1st coil unit 6b 2nd coil unit 7 Induction heating area 8 Water heater Unit 8a first hot water unit 8b second hot water unit 10 introduction pipe 10a introduction pipe 10b introduction pipe 11 discharge pipe 11a discharge pipe 11b discharge pipe 12 heating pipe 13 valve 14 flow rate detector 15 temperature setter 16 control device 17 flow path DESCRIPTION OF SYMBOLS 18 Heating body 19 Parallel pipe 20a Introduction side connecting pipe 20b Discharge side connecting pipe 21 Heating container 22 Heating element 23 Flow hole 24 Buffer space

Claims (4)

  Each of the first and second coils has a first coil and a second coil wound in a spiral shape so that the long conductive members are generally arranged on a virtual plane, and the first coil and the second coil have a predetermined interval. The first coil and the second coil are wound and electrically connected so that high-frequency currents flow in the same direction at the same time, and are electrically connected to each other. The induction heating region sandwiched between the second coils has a flow path through which water flows and a heating member that is induction-heated in thermal contact with the water flowing through the flow path. Features an electric continuous water heater.   The flow path is provided with an introduction path for introducing water into the induction heating area, a discharge path for discharging water from the induction heating area, a plurality of branches branched from the introduction path in parallel and terminated in the discharge path. The electric continuous water heater according to claim 1, comprising:   A plurality of water heater units including the first coil, the second coil, the flow path, and the heating member are provided, and water heated by the first water heater unit is further supplied by the second water heater unit. The electric continuous water heater according to claim 1 or 2, wherein the electric continuous water heater is configured to be heated.   The electric continuous water heater according to claim 3, wherein steam is generated by using semiconductor ceramics having a circulation hole for water or the like as a heating member in the second water heater unit.

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