JP2012061421A - Water supply device, and water heater having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device which is usable for a long period of time without requiring the maintenance of a corrosion-inhibiting component removal apparatus.SOLUTION: The water supply device comprises: a corrosion-inhibiting component addition apparatus for dissolving corrosion-inhibiting components into introduced water; and a corrosion-inhibiting component removal apparatus 15 placed on a downstream side of the corrosion-inhibiting component addition apparatus, formed of a pair of opposed electrode (16a, 16b), a cation exchanger 17, and an anion exchanger 18, and having an ion exchanger 20 arranged between the electrodes (16a, 16b), wherein the corrosion-inhibiting components flowing into the corrosion-inhibiting component removal apparatus 15 are removed from the introduced water by an ion exchange reaction and then discharged.

Description

  The present invention relates to a water supply device such as a water supply facility or a hot water supply facility, and more particularly to a water supply device that does not require maintenance of a corrosion inhibiting component removing device and can be used for a long period of time.

  Conventionally, in this type of apparatus, a material containing a target component has been used in water to suppress corrosion of piping (for example, see Patent Document 1).

  FIG. 7 shows a conventional water supply apparatus described in Patent Document 1. In FIG. As shown in FIG. 7, the water circuit 10 includes a corrosion inhibiting component adding device 14 and a corrosion inhibiting component removing device 15 disposed on the downstream side of the corrosion inhibiting component adding device 14.

JP 2005-120700 A

  In the conventional configuration, the removal method by the two-stage treatment of the cation exchange resin and the anion exchange resin or the removal method by the reverse osmosis membrane is used as the corrosion inhibiting component removing device. However, the removal capability of the cation exchange resin and the anion exchange resin by the two-stage treatment is limited by the ion exchange capacity. When the addition amount of the corrosion inhibiting component exceeds the ion exchange capacity, the corrosion inhibiting component is not removed and is discharged from the water use location.

  For this reason, it is necessary to periodically replace the ion exchanger according to the ion exchange capacity or to carry out the regeneration process by adding sodium chloride. In the former case, since the exchange period varies depending on the frequency of use, a means for measuring and displaying the amount used is required. In the latter case, high-concentration sodium chloride water is discharged after the regeneration treatment, which corrodes the piping and shortens the device life.

  This invention solves the said conventional subject, and it aims at providing the water supply apparatus which can be used over a long term, without requiring the maintenance of a corrosion inhibitor component removal apparatus.

  In order to solve the above-described conventional problems, a water supply device of the present invention is disposed on a downstream side of a corrosion-inhibiting component addition device that dissolves a corrosion-inhibiting component in introduced water, and a pair of corrosion-inhibiting component addition devices. The corrosion that is formed from the opposing electrodes, the cation exchanger and the anion exchanger, and has a corrosion inhibiting component removing device having an ion exchanger disposed between the electrodes, and flows into the corrosion inhibiting component removing device The inhibitory component is discharged after being removed from the introduced water by an ion exchange reaction.

  Thus, by applying a voltage to the electrode, it is possible to discharge the corrosion inhibiting component adsorbed on the ion exchanger from the corrosion inhibiting component removing device. Accordingly, the replacement of the ion exchanger or the addition of sodium chloride can be omitted, the number of maintenance can be reduced, and the life of the apparatus can be extended.

ADVANTAGE OF THE INVENTION According to this invention, the maintenance of a corrosion inhibitor component removal apparatus is not required, but the water supply apparatus which can be used over a long term can be provided.

The block diagram of the water supply apparatus in Embodiment 1 of this invention Configuration diagram of the corrosion inhibitor addition equipment Configuration diagram of the corrosion inhibitor removal device The block diagram of the corrosion suppression component addition apparatus in Embodiment 2 of this invention The block diagram of the hot-water supply apparatus in Embodiment 3 of this invention Configuration diagram of sintered porous body in Embodiment 4 of the present invention Configuration diagram of a conventional water supply device

  The first invention is a corrosion inhibiting component addition device for dissolving a corrosion inhibiting component in introduced water, and a pair of opposed electrodes, a cation exchanger and an anion exchange which are disposed on the downstream side of the corrosion inhibiting component addition device. A corrosion-inhibiting component removing device having an ion exchanger disposed between the electrodes, and the corrosion-inhibiting component flowing into the corrosion-inhibiting component removing device is removed from the introduced water by an ion exchange reaction. The water supply device is characterized by being discharged after being removed.

  Thus, by applying a voltage to the electrode, it is possible to discharge the corrosion inhibiting component adsorbed on the ion exchanger from the corrosion inhibiting component removing device. Accordingly, the replacement of the ion exchanger or the addition of sodium chloride can be omitted, the number of maintenance can be reduced, and the life of the apparatus can be extended.

  In a second aspect of the present invention, in particular, in the water supply device of the first aspect, the cation exchanger and the anion exchanger are porous bodies formed by mixing an ion exchange resin with thermoplastic resin particles. It is characterized by.

  This makes it possible to reduce pressure loss during water flow and increase the amount of treatment per unit time. At the same time, since the introduced water also comes into contact with the ion exchange resin particles that are not exposed on the surface of the sintered body, the corrosion-inhibiting component removal efficiency can be improved.

  In the third invention, in particular, in the ion exchanger of the second invention, the ion exchange resin in which the cation exchanger is formed is a weakly acidic ion exchange resin, and the ion exchange resin in which the anion exchanger is formed is weak. It is a basic ion exchange resin.

  Thereby, by making the pH at the time of regeneration of the ion exchanger more acidic than 4, the cation adsorption action at the time of regeneration can be suppressed, and the regeneration of the cation exchanger can be completed quickly.

  The fourth invention is characterized in that, in the water supply device of any one of the first to third inventions, the corrosion inhibiting component is dissolved in water only at the time of regeneration of the water-splitting ion exchange membrane. .

  Accordingly, in consideration of the possibility of having an aversion to including the corrosion-inhibiting component-treated water in the mouth or the like, it is possible to prevent the corrosion-inhibiting component from flowing into the water use location.

  The fifth invention is a water heater characterized in that, in particular, the water supply device according to any one of the first to fourth inventions is arranged in a bathtub water pouring circuit for pouring water into the bathtub.

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

(Embodiment 1)
FIG. 1 shows a water supply apparatus according to the first embodiment. FIG. 2 shows a structural diagram of the corrosion inhibiting component adding device 14, and FIG. 3 shows a structural diagram of the corrosion inhibiting component removing device 15.

  As shown in FIG. 1, the water circuit 10 is provided with a corrosion inhibiting component adding device 14, a corrosion inhibiting component removing device 15 on the downstream side of the corrosion inhibiting component adding device 14, and the corrosion inhibiting component removing device 15. And a drainage flow path 13.

  In FIG. 2, the corrosion inhibiting component 11 that is sodium polyphosphate is in the form of powder or granules, or a mixture of powder and granules, and is accommodated in a corrosion inhibiting component storage container (inorganic compound storage means) 12. . The corrosion inhibiting component 11 is soluble in water. The corrosion-inhibiting component 11 in FIG. 2 is in the form of granules having different diameters, and when this is configured to be multilayered, a porous space is formed in the corrosion-inhibiting component storage container 12. The corrosion-inhibiting component storage container 12 is communicated by the water circuit 10 and constitutes a corrosion-inhibiting component adding device 14.

  The operation and action of the corrosion inhibiting component addition apparatus 14 configured as described above will be described below.

  Water flowing from the water circuit 10 into the corrosion inhibiting component adding device 14 passes through a porous space formed in the corrosion inhibiting component storage container 12. Since water has viscosity, a velocity boundary layer is generated in a region near the surface from the surface of the corrosion inhibiting component 11 when passing through the porous space. The flow velocity of the velocity boundary layer near the surface of the corrosion inhibiting component 11 is small, and the flow velocity passing through the central portion of the porous space has a large distribution.

  Since the corrosion inhibiting component 11 is soluble in water, the surface molecules of the corrosion inhibiting component 11 in the vicinity of the surface of the corrosion inhibiting component 11 are dissolved in the water in the vicinity of the surface, and the dissolved concentration of water is increased. Since the water near the surface has a low flow rate, the dissolved concentration has a high value. On the other hand, the dissolved concentration of water flowing in the center of the porous space having a high flow rate is low.

  At this time, if there is a difference in the concentration of the inorganic compound dissolved in water, the lower substance moves from the higher one according to the concentration difference (Fick's law), so the inorganic compound dissolved in the water near the surface Move to low center water. By utilizing this principle of substance diffusion, the corrosion inhibiting component 11 can be dissolved in water in the porous space.

  The dissolved corrosion inhibiting component 11 is ionized into sodium ions and polyphosphate ions, respectively. Polyphosphate ions chelate with divalent cations such as calcium ions and magnesium ions in the introduced water, and colloidalize these cations. The colloidal particles are adsorbed on the cathode part to form a film.

  This formed film has an effect of preventing calcium carbonate crystals from adhering to the pipe surface as a scale. Moreover, it adsorb | sucks to a calcium carbonate crystal, makes it colloid by changing from a rhombohedral to a spherical nucleus, and has an effect which prevents that a calcium carbonate crystal adheres to the piping surface as a scale.

  Here, based on FIG. 3, the structure of the corrosion suppression component removal apparatus 15 is demonstrated in detail.

The corrosion inhibiting component removing device 15 includes a pair of first electrode 16a and second electrode 16b facing each other, a cation exchanger 17 that adsorbs cations dissolved in water, and a negative electrode dissolved in water. An anion exchanger 18 that adsorbs ions is composed of an ion exchanger 20 bonded to the front and back so as to have different polarities.

  A plurality of ion exchangers 20 are stacked between the electrodes 16, the ion exchangers 20 are stacked on a flat surface between the flat opposing electrodes 16, and between the concentric cylindrical opposing electrodes 16 having different radii. The ion exchanger 20 may be stacked concentrically or spirally.

  The ion exchanger 20 has a polymer or copolymer polymer of styrene or divinylbenzene as a basic skeleton, and a sulfonic acid group or a carboxylic acid group such as acrylic acid or methacrylic acid is introduced into the cation exchanger 17. The anion exchanger 18 is introduced with a quaternary ammonium group or a primary to tertiary amino group.

  When the ion exchanger 20 is molded, the moldability of the membrane can be improved by kneading and dispersing an ion exchange resin such as polyethylene in a thermoplastic resin such as polyethylene or polypropylene. The ion exchanger 20 bonded to the front and back so as to have different polarities is called a water-splitting ion exchange membrane. Dissociation of water is promoted at a low voltage because dissociation of water is promoted at the interface of the ion exchanger by applying a voltage. It can be performed.

  Since the operation of the corrosion inhibiting component removing device 15 is different between when the ions dissolved in the water are adsorbed by the ion exchanger 20 and when the ions adsorbed on the ion exchanger 20 are desorbed, first, the corrosion is suppressed. The case where the suppression component removal apparatus 15 adsorb | sucks the ion in water with the ion exchanger 20 is demonstrated.

  When the corrosion inhibiting component removing device 15 adsorbs the corrosion inhibiting component 11 dissolved in water, each ion such as cation Ca, Mg, Na, Mn, Fe dissolved in water is hydrogenated by the cation exchanger 17. Each ion such as anion polyphosphoric acid, Cl, carbonic acid, sulfuric acid, nitric acid, etc. dissolved in water is ion-exchanged to hydroxide ions in the anion exchanger 18 so that various ions dissolved in water. Is adsorbed to the ion exchanger 20.

  When the ion exchanger 20 adsorbs ions, a voltage is applied so that the first electrode 16a on the cation exchanger 17 side of the ion exchanger 20 becomes an anode and the second electrode 16b on the anion exchanger 18 side becomes a cathode. By applying, the ions in the corrosion inhibiting component removing device 15 move to the ion exchanger 20, so that the ion adsorption rate of the ion exchanger can be increased.

  At that time, since the theoretical decomposition voltage of water in which water molecules are electrolyzed to generate hydrogen molecules and oxygen molecules is 1.226 V, hydrogen gas and oxygen gas are generated by applying a voltage lower than the water decomposition voltage. Ions that are dissolved in water without being absorbed can be efficiently adsorbed by the ion exchanger 20.

  In the case of treating water with a biased pH by adsorbing ions dissolved in water by the corrosion inhibiting component removing device 15, anionic species are converted to hydroxide ions when acidic, and cations when basic. Since water can be brought close to neutral water by exchanging the species with hydrogen ions, the water treated by the corrosion inhibiting component removing device 15 can prevent corrosion due to pH.

  In addition, by applying a voltage lower than the decomposition voltage of water, the treated water does not contain the decomposition gas of water, and even when the solubility of the gas is reduced by heating by the heating means, The cracked gas is not generated and does not accumulate in the hot water storage tank and flow path.

Note that, when the corrosion-inhibiting component removing device 15 adsorbs ions dissolved in water, it is not necessary to apply a voltage between the electrodes 16. The effect of the ion exchanger 20 adsorbing ions dissolved in water remains the same, and the effect of not containing the water decomposition gas in the treated water is also unchanged.

  Next, the operation and action when the corrosion inhibiting component removing device 15 desorbs ions adsorbed on the ion exchanger 20 will be described.

  When the ion exchanger 20 desorbs ions, the water guided to the corrosion inhibiting component removing device 15 by the water circuit 10 is processed by the corrosion inhibiting component removing device 15 and then switched by the three-way valve 19 and the drainage flow. The water is discharged from the water supply device through the passage 13. In the corrosion inhibiting component removing device 15, a voltage is applied so that the first electrode 16a on the cation exchanger 17 side of the ion exchanger 20 becomes a cathode and the second electrode 16b on the anion exchanger 18 side becomes an anode.

  Since the theoretical dissociation voltage of water at which water molecules dissociate into hydrogen ions and hydroxide ions is 0.828 V, applying a voltage higher than the water dissociation voltage causes the cation exchanger 17 of the ion exchanger 20 and the negative ion to be negatively charged. Water is dissociated at the interface of the ion exchanger 18, exchanged with ions adsorbed on the ion exchanger 20, and desorbed to regenerate the ion exchanger.

  If the applied voltage is less than the decomposition voltage of water, the treated water does not contain the decomposition gas of water, so that dissolved gas is prevented from growing and accumulating in the drainage flow path 13 during discharge from the water supply device. can do.

  In addition, when the applied voltage is equal to or higher than the water decomposition voltage, the pipe diameter of the drainage channel 13 is narrowed to sufficiently increase the flow rate of the drainage channel 13 so that bubbles do not stay in the drainage channel 13. By doing so, it is possible to prevent water decomposition gas from accumulating in the drainage flow path 13.

  Since the water decomposition gas can be reliably discharged from the water heater, sufficient current can be given to dissociate the water and regenerate the ion exchanger, improving the regeneration efficiency, shortening the regeneration time, Regeneration waste water can be reduced.

(Embodiment 2)
FIG. 4 shows a structural diagram of the corrosion inhibiting component adding apparatus 14 in the second embodiment of the present invention.

  In FIG. 4, the inlet and outlet of the corrosion inhibiting component addition device 14 are connected to a bathtub water pouring circuit 39. When the equivalent diameter d1 of the corrosion-inhibiting component storage container 12 for storing the corrosion-inhibiting component 11 and the equivalent diameter d2 of the bathtub water pouring circuit 39 are set, in FIG. 4, each is determined to have a size that satisfies d1> d2.

  About the water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Since the corrosion inhibiting component storage container 12 containing the corrosion inhibiting component 11 and the filtration means are provided for the water circuit 10, a pressure loss occurs when water passes through the corrosion inhibiting component adding device 14. When pressure loss occurs, the flow rate of water supplied to the bathtub 42 decreases.

  Here, assuming that the equivalent diameter d1 of the corrosion inhibiting component storage container 12 is such that d1> d2 with respect to the equivalent diameter d2 of the bathtub water pouring circuit 39, the average flow velocity u1 of the corrosion inhibiting component storage container 12 is It becomes smaller than the average flow velocity u2 of the bathtub water pouring circuit 39. Since the pressure loss of the fluid in the water circuit 10 is proportional to the square of the average flow velocity of the fluid, an increase in the pressure loss when passing through the corrosion inhibiting component adding device 14 can be reduced.

As described above, in the present embodiment, the water flow that passes through the corrosion-inhibiting component is obtained by making the equivalent diameter of the corrosion-inhibiting component storage container larger than the equivalent diameter of the bathtub water pouring circuit that connects the melting device. The pressure loss due to can be reduced, and the hot water filling time to the bathtub can be completed quickly.

(Embodiment 3)
FIG. 5 shows a block diagram of a hot water supply apparatus in the third embodiment of the present invention.

  In FIG. 5, a heat pump unit 21 is configured by connecting a compressor 22, a hot water supply heat exchanger 23, a decompression unit 24, and an evaporator 25 in an annular manner in order by a refrigerant circuit 26. Water is stored in a hot water storage tank 28 of the hot water storage unit 27, and a hot water discharge circuit 30 is a circuit that connects the hot water storage tank 28, a hot water supply pump 29, a hot water supply heat exchanger 23, and a hot water storage tank 28 in this order.

  The bathtub water heating circuit 35 is a circuit that connects the hot water storage tank 28, the bath heat exchanger 33, the heating pump 34, and the hot water storage tank 28 in order, and the bathtub 42 is connected to the other circuit of the bath heat exchanger 33. . The bathtub water circulation circuit 41 is a circuit which connects the bathtub 42, the bathtub water pump 40 which conveys bathtub water, and the bath heat exchanger 33 in order. The bathtub water pouring circuit 39 is a circuit for pouring the water in the hot water storage tank 28 to the bathtub 42 via the bathtub water circulation circuit 41.

  In this circuit, a bath water mixing valve 36 for mixing hot water in the hot water storage tank 28 and tap water, temperature detecting means 37 for detecting the temperature of the pouring water, and bath water pouring for opening and closing the bath water pouring circuit 39. The hot water valve 38 is provided in order. The corrosion inhibiting component adding device 14 is provided in the bathtub water pouring circuit 39 on the downstream side of the bath water pouring valve 38 so as to be housed in the housing of the main body.

  The operation of heating the water stored in the hot water storage tank 28 by the heat pump unit 21 is as follows. The water in the hot water storage tank 28 is conveyed to the hot water supply heat exchanger 23 by the hot water supply water pump 29 and heated by the heat pump cycle operation. The hot water supply pump 29 controls the flow rate of the hot water supply circuit 30 so that the temperature of the hot water heated by the hot water supply heat exchanger 23 becomes a predetermined temperature.

  The filling of the bathtub 42 and the heating of the bathtub water are as follows. The bathtub water mixing valve 36 of the bathtub water pouring circuit 39 has a hot water and tap water so that the pouring temperature detected by the temperature detecting means 37 becomes a temperature preset by a remote controller or the like (not shown). Adjust the mixing ratio. The bathtub water having a predetermined temperature flows out into the bathtub 42 through the bathtub water pouring circuit 39 and the bathtub water circulation circuit 41 in this order.

  On the other hand, when heating the bathtub water in the bathtub 42, the hot water stored in the hot water storage tank 28 is conveyed to the bath heat exchanger 33 by the bathtub water heating pump 34, and the bathtub water conveyed from the bathtub water pump 40. Heat. Hot-water supply water whose temperature has been lowered by heating the bath water in the bath heat exchanger 33 flows into the interior from the lower part of the hot-water storage tank 28 to which the hot-water supply lower circuit 31 is connected.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the user hot waters the bathtub 42, the remote controller or the like performs a hot water operation instruction operation. After the remote control operation, when the water adjusted by the bathtub water mixing valve 36 to a preset temperature controls the bathtub water pouring valve 38 from closed to open, the corrosion inhibiting component adding device 14 and the corrosion inhibiting component removing device 15. It flows out into the bathtub 42 via the bathtub water circulation circuit 41. When water passes through the corrosion inhibiting component adding device 14, the corrosion inhibiting component 11 is dissolved in water, but the corrosion inhibiting component 11 is removed by the corrosion inhibiting component removing device 15, so the corrosion inhibiting component 11 is dissolved in the bathtub 42. The water made to flow does not flow into the bathtub 42.

Although the corrosion inhibiting component adding device 14 is located downstream of the bathtub water pouring valve 38, when the bathtub water pouring valve 38 is controlled from opening to closing, a water hammer phenomenon occurs, and the upstream circuit enters the upstream circuit. The bathtub water mixing valve 36, the hot water storage tank 28, etc. which are provided give a water pressure load higher than the water pressure. By providing it on the downstream side, a hydraulic load is not applied to the corrosion inhibiting component adding device 14.

  As described above, the present embodiment includes the bathtub water pouring circuit 39 and the bathtub water pouring valve 38, and includes the bathtub water pouring valve 38, the corrosion inhibiting component adding device 14, and the corrosion inhibiting component removing device 15. These were used as the hot water supply apparatus arranged in the bathtub water pouring circuit 39 in this order.

  Thereby, since the melting device is not affected by the water hammer phenomenon (water pressure increase in the bathtub water pouring circuit or the like) that occurs when hot water to the bathtub is stopped, the pressure resistance structure of the melting device can be simplified. Furthermore, since the water flow of the hot water to the bathtub is used, the water in which the inorganic compound is dissolved can be supplied to the bathtub at the same time as the hot water, thereby improving convenience.

  In the present invention, the corrosion inhibiting component adding device 14 and the corrosion inhibiting component removing device 15 are housed in the main body housing of the water heater and are used as the bathtub water pouring circuit 39. An effect can be obtained.

  Although it is possible to provide in the bathtub water circulation circuit 41 outside the main body casing, the atmospheric temperature inside the main body casing is reduced by heat radiation from the hot water storage tank 28 even at a low outside temperature. Is always heated, so that it is not necessary or simple to provide heat insulation such as freezing prevention of the corrosion inhibiting component adding device 14.

  Further, when the hot water heater is a hot water storage type hot water heater, since hot water is stored in the hot water storage tank, the hot water is supplied to the corrosion inhibiting component adding device 14 and the corrosion inhibiting component removing device 15 to provide equipment. Can be sterilized and sterilized.

(Embodiment 4)
The cation exchanger 17 and the anion exchanger 18 of the water-splitting ion exchange membrane, which is the ion exchanger 20 of the present invention, were obtained by mixing the ion exchange resin 51 with the polyethylene particles 52 and then sintering the mixture. FIG. 6 shows the structure of the material. These porous bodies were obtained by the following method.

  Polyethylene particles having an average particle size of 50 to 300 microns and an MFR of 3 g / 10 min or less, which is an index of fluidity of the synthetic resin, and an ion exchange having an average particle size of 30 microns and less than the average particle size of polyethylene The resin was uniformly mixed using a blender.

  At this time, the weight concentration of the ion exchange resin in the whole was set to 5 wt% or more and 60 wt% or less. The obtained mixed powder was filled in a mold and left to stand in a tank having an atmospheric temperature of the melting point of polyethylene resin + less than 50 degrees for 5 minutes or more to obtain a porous body 53. The obtained porous body 53 has pores 54, and the introduced water passes through the pores 54, so that pressure loss can be reduced even if a large amount of introduced water is passed.

  As described above, the water supply apparatus according to the present invention leads to improvement in reliability and improvement in operation efficiency, and can be used for a hot water storage hot water heater, a gas heat source hot water heater, and the like.

DESCRIPTION OF SYMBOLS 10 Water circuit 11 Corrosion suppression component 12 Corrosion suppression component storage container 13 Drain flow path 14 Corrosion suppression component addition apparatus 15 Corrosion suppression component removal apparatus 16a 1st electrode 16b 2nd electrode 17 Cation exchanger 18 Anion exchanger 20 Ion exchanger (water splitting ion exchange membrane)
DESCRIPTION OF SYMBOLS 21 Heat pump unit 27 Hot water storage unit 28 Hot water storage tank 36 Bath water mixing valve 37 Temperature detection means 38 Bath water pouring valve 39 Bath water pouring circuit 42 Tub 51 Ion exchange resin 52 Polyethylene particle 53 Porous body 54 Pore

Claims (5)

A corrosion-inhibiting component addition device for dissolving a corrosion-inhibiting component in the introduced water, disposed on the downstream side of the corrosion-inhibiting component addition device, and formed from a pair of opposed electrodes, a cation exchanger and an anion exchanger, A corrosion inhibiting component removing device having an ion exchanger disposed between the electrodes, and the corrosion inhibiting component flowing into the corrosion inhibiting component removing device is removed from the introduced water by an ion exchange reaction and then discharged. A water supply device. The water supply apparatus according to claim 1, wherein the cation exchanger and the anion exchanger are porous bodies formed by mixing an ion exchange resin with thermoplastic resin particles. 3. The ion exchange resin that forms the cation exchanger is a weakly acidic ion exchange resin, and the ion exchange resin that forms the anion exchanger is a weakly basic ion exchange resin. The water supply device described. The water supply apparatus according to any one of claims 1 to 3, wherein the corrosion inhibiting component is dissolved in water only at the time of regeneration of the water-splitting ion exchange membrane. A water heater, wherein the water supply device according to any one of claims 1 to 4 is disposed in a bathtub water pouring circuit for pouring water into the bathtub.