JP7003416B2 - Water heater - Google Patents

Description

The present invention relates to a hot water supply device.

A hot water supply device capable of obtaining hot water containing carbon dioxide, that is, carbon dioxide gas, which is effective for recovery from fatigue, reduction of muscle pain, heat retention, lowering of blood pressure, etc., is known. The apparatus described in Patent Document 1 is configured as follows. The exhaust gas from the combustion device or carbon dioxide in the atmosphere is adsorbed on an adsorbent such as zeolite. By operating the decompression pump to reduce the pressure, carbon dioxide is released from the adsorbent, and the released carbon dioxide is mixed with hot water. Further, in the apparatus described in Patent Document 2, carbon dioxide gas from a carbon dioxide gas cylinder is mixed into hot water by a carbon dioxide gas mixing apparatus.

Japanese Unexamined Patent Publication No. 6-78963 Japanese Unexamined Patent Publication No. 5-233376

Since the device described in Patent Document 1 requires a decompression pump, there is a problem that the sound when the pump is operated is loud, a problem that the size of the device is large, and a problem that the cost is high. In the apparatus described in Patent Document 2, since the carbon dioxide gas cylinder needs to be replaced, there is a problem that maintenance is troublesome.

The present invention has been made to solve the above-mentioned problems, and in a hot water supply device capable of mixing carbon dioxide in hot water, at least one of low noise, space saving, and reduction of maintenance is achieved. The purpose is to achieve.

The hot water supply device according to the present invention includes a gas-liquid mixing device that mixes gas supplied through the intake passage with water and a carbon dioxide generator capable of supplying carbon dioxide into the intake passage, and comprises carbon dioxide. The carbon generator includes an adsorbing means for adsorbing carbon dioxide in the air and a heating means for heating the adsorbing means so that the carbon dioxide adsorbed by the adsorbing means is released, and the adsorbing means contains an amine compound. The air filter comprises an air filter substrate and a solid absorber held in the air filter substrate, the solid absorber holding in the pores or layers with a carrier having pores or layers. It is a hot water supply device provided with the above-mentioned amine compound, further provided with an air blowing means capable of blowing air to the adsorbing means, and the heating means heats the adsorbing means to supply carbon dioxide released from the adsorbing means into the intake passage. When the carbon dioxide supply operation is performed, the blower means is stopped, and when the carbon dioxide supply operation is not executed, the carbon dioxide in the air is adsorbed to the air filter of the adsorbing means by operating the blower means .

According to the present invention, it is possible to achieve at least one of low noise, space saving, and reduction of maintenance in a hot water supply device capable of mixing carbon dioxide in hot water.

It is a figure which shows the hot water supply apparatus by Embodiment 1. FIG. It is a vertical sectional view which shows the example of the gas-liquid mixing apparatus in Embodiment 1. FIG. It is a flowchart which shows an example of the operation of the water heater by Embodiment 1. FIG. It is a figure which shows the hot water supply apparatus by Embodiment 2. FIG.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate descriptions.

Embodiment 1.
FIG. 1 is a diagram showing a water heater 1A according to the first embodiment. As shown in FIG. 1, the hot water supply device 1A of the first embodiment includes a hot water storage tank 2, a water supply adapter 3, a reheating circulation flow path 4, a hot water discharge flow path 5, a control device 6, and a terminal device 7. In FIG. 1, the illustration of the heating device for heating the hot water stored in the hot water storage tank 2 is omitted. The heating device may be any of a heat pump type, an electric heater type, a solar heat type, a combustion type, a combination of a plurality of types, and the like. In FIG. 1, the hot water storage tank 2 and the water supply adapter 3 are shown in a side view, the bathtub 10 is shown in a schematic side sectional view, and the other configurations are shown in a schematic view.

The water supply adapter 3 includes a main body 3a, a nozzle portion 3b, and an opening 3c. The bathtub 10 includes a first inner wall 10a and a bottom surface 10b. The water supply adapter 3 is installed so as to face the internal space of the bathtub 10 from the first inner wall 10a of the bathtub 10. The nozzle portion 3b has a cylindrical shape protruding from the main body 3a. The opening 3c is formed on the upper surface of the main body 3a.

The reheating circulation flow path 4 includes a reheating heat exchanger 4a, an forward flow path 4b, a return flow path 4c, and a circulation pump 4d. One end of the forward flow path 4b is connected to the inlet 4e of the secondary side flow path of the reheating heat exchanger 4a. The other end of the outgoing flow path 4b is connected to the main body 3a of the water supply adapter 3 on the outside of the bathtub 10. The opening 3c of the water supply adapter 3 communicates with the outgoing flow path 4b inside the main body 3a. A circulation pump 4d is connected in the middle of the outgoing flow path 4b. One end of the return flow path 4c is connected to the outlet 4f of the secondary side flow path of the reheating heat exchanger 4a. The other end of the return flow path 4c is connected to the main body 3a of the water supply adapter 3 on the outside of the bathtub 10. The flow path of the nozzle portion 3b of the water supply adapter 3 communicates with the return flow path 4c inside the main body 3a.

When the circulation pump 4d is operated, it becomes as follows. The bath water in the bathtub 10 is drawn into the outgoing flow path 4b from the opening 3c of the water supply adapter 3 and guided to the reheating heat exchanger 4a. The bath water that has passed through the reheating heat exchanger 4a returns to the water supply adapter 3 through the return flow path 4c, and is discharged from the nozzle portion 3b into the bath water inside the bathtub 10. The arrow in FIG. 1 indicates the direction in which the bath water flows during the operation of the circulation pump 4d.

In the present embodiment, the ejection direction of the nozzle portion 3b is an oblique direction with respect to the first inner wall 10a of the bathtub 10. Thereby, when the circulation pump 4d is operated, the recirculation RF can be generated inside the bathtub 10.

Although not shown, a circulation path for circulating hot water supplied from the hot water storage tank 2 or hot water heated by the heating device as a heat source fluid is connected to the primary side flow path of the reheating heat exchanger 4a. To. When performing a reheating operation for heating the bath water in the bathtub 10, the following is performed. The circulation pump 4d is operated and the heat source fluid is circulated to the reheating heat exchanger 4a. By receiving the heat of the heat source fluid in the reheating heat exchanger 4a and returning the heated bath water to the bathtub 10, the temperature of the bathwater stored in the bathtub 10 can be raised or kept warm.

One end of the hot water flow path 5 is connected to the hot water storage tank 2. The other end of the hot water flow path 5 is connected to a branch portion 4g formed in the forward flow path 4b between the reheating heat exchanger 4a and the circulation pump 4d. When filling the bathtub 10 with hot water, hot water can be supplied from the hot water storage tank 2 to the bathtub 10 via the hot water outlet flow path 5 and the reheating circulation flow path 4. The hot water supplied from the hot water flow path 5 flows from the branch portion 4g to the reheating heat exchanger 4a side, reaches the water supply adapter 3 through the return flow path 4c, and is injected from the nozzle portion 3b into the bathtub 10. .. The hot water supplied from the hot water flow path 5 may flow from the branch portion 4g to the circulation pump 4d side in parallel. In that case, the hot water supplied from the hot water flow path 5 is injected into the bathtub 10 not only from the nozzle portion 3b but also from the opening 3c. Although not shown, a temperature control unit for adjusting the hot water supply temperature by mixing low-temperature water supplied from the water supply pipe is provided in the middle of the hot water flow path 5.

The control device 6 controls the operation of the device included in the hot water supply device 1A. The terminal device 7 can perform data communication with the control device 6 in both directions by wire communication or wireless communication. In this embodiment, it is assumed that the terminal device 7 is installed in the bathroom. The terminal device 7 includes a user interface such as an operation unit operated by the user, a display unit for notifying the user of information, and a voice announcement device.

The hot water storage tank 2, the reheating heat exchanger 4a, the circulation pump 4d, a part of the forward flow path 4b, a part of the return flow path 4c, the hot water discharge flow path 5, and the control device 6 are housed in one housing 8. You may.

The hot water supply device 1A of the present embodiment includes a gas-liquid mixing device 12 and a carbon dioxide generator 14. The gas-liquid mixing device 12 is connected in the middle of the return flow path 4c between the reheating heat exchanger 4a and the water supply adapter 3. An intake passage 13 communicates with the gas-liquid mixing device 12. The intake passage 13 can be opened and closed by the solenoid valve 15 installed in the middle of the intake passage 13. When the solenoid valve 15 is opened while the bath water is flowing through the reheating circulation flow path 4, the gas is introduced into the gas-liquid mixing device 12 through the intake passage 13. The gas-liquid mixing device 12 mixes the gas introduced from the intake passage 13 into the bath water. As a result, bubbles are generated in the bath water passing through the gas-liquid mixing device 12. Bath water containing the bubbles is supplied into the bathtub 10 from the nozzle portion 3b of the water supply adapter 3. The open / closed state of the solenoid valve 15 is controlled by the control device 6. By adjusting the opening degree of the solenoid valve 15, the intake amount of the gas-liquid mixing device 12 can be adjusted. By adjusting the intake amount of the gas-liquid mixing device 12, the diameter of the bubbles generated in the gas-liquid mixing device 12 can be controlled.

FIG. 2 is a vertical sectional view showing an example of the gas-liquid mixing device 12 according to the first embodiment. The gas-liquid mixing device 12 shown in FIG. 2 has a venturi mechanism that generates a lower pressure than a low-speed portion by narrowing the flow of the fluid and increasing the flow velocity. The gas-liquid mixing device 12 includes an inlet portion 12a, a stationary blade 12b, a diameter reduction portion 12c, a gas introduction portion 12d, and a diameter expansion portion 12e. Water travels from the left side to the right side in FIG. 2, as indicated by the arrow in the traveling direction P. The inner diameter of the inlet portion 12a is at least partially constant along the traveling direction P. A stationary wing 12b is installed inside the inlet portion 12a. The stationary blade 12b applies a swirling force to the flow of water passing through the inlet portion 12a to generate a swirling flow SF that swirls around the axis 12f of the flow path. The reduced diameter portion 12c is formed coaxially on the downstream side of the inlet portion 12a. The inner diameter of the reduced diameter portion 12c is continuously reduced along the traveling direction P. The internal space of the reduced diameter portion 12c has a substantially conical shape. The reduced diameter portion 12c reduces the radius of the swirling flow SF generated by the stationary blade 12b, and speeds up the swirling flow SF. The gas introduction portion 12d has a passage for introducing gas from the outside in the radial direction at the downstream end portion of the diameter reduction portion 12c, that is, the maximum diameter reduction portion 12g. The intake passage 13 in FIG. 1 is connected to the gas introduction unit 12d. Due to the negative pressure generated in the maximum diameter portion 12g, intake is possible through the intake passage 13 and the gas introduction portion 12d. The enlarged diameter portion 12e is formed coaxially on the downstream side of the reduced diameter portion 12c. The inner diameter of the enlarged diameter portion 12e continuously expands along the traveling direction P. The internal space of the enlarged diameter portion 12e has a substantially conical shape. In the enlarged diameter portion 12e, the gas introduced from the gas introducing portion 12d is mixed with the swirling flow SF speeded up by the reduced diameter portion 12c to generate bubbles 90. With such a gas-liquid mixing device 12, the gas introduced from the gas introduction unit 12d is sheared by the swirling flow SF, so that bubbles 90 having a small diameter, that is, fine bubbles can be generated.

The structure of the gas-liquid mixing device 12 described above is an example, and a gas-liquid mixing device having another structure may be used. Further, the gas-liquid mixing device such as the above-mentioned gas-liquid mixing device 12 is not limited to the naturally-intake type gas-liquid mixing device, and a gas-liquid mixing device forcibly sucking air by a pump or the like may be used.

The carbon dioxide generator 14 can supply carbon dioxide into the intake passage 13. The carbon dioxide generator 14 includes an adsorption means for adsorbing carbon dioxide in the air and a heating means for heating the adsorption means so that the carbon dioxide adsorbed by the adsorption means is released. In the present embodiment, the adsorption means of the carbon dioxide generator 14 includes an air filter containing an amine compound. In this embodiment, an alkylamine derivative containing an alkyl group is used as the amine compound.

In the present embodiment, the carbon dioxide generator 14 is connected to the inlet portion of the intake passage 13. The external air passes through the air filter of the carbon dioxide generator 14 and flows into the intake passage 13. The solenoid valve 15 is arranged in the intake passage 13 between the carbon dioxide generator 14 and the gas-liquid mixing device 12. One side of the air filter of the carbon dioxide generator 14 is in contact with the atmosphere, that is, air. The air filter of the carbon dioxide generator 14 selectively adsorbs carbon dioxide in the atmosphere, that is, in the air by the action of the alkylamine derivative at room temperature.

At least a part of the air filter of the carbon dioxide generator 14 preferably has a honeycomb shape or a corrugated shape. By doing so, the area where the air filter comes into contact with the air can be increased, so that carbon dioxide in the air can be adsorbed more efficiently.

When the heating means of the carbon dioxide generator 14 heats the air filter which is the adsorption means, the carbon dioxide adsorbed on the air filter is released. When the heating means of the carbon dioxide generator 14 heats the air filter while the gas is flowing in the intake passage 13, the carbon dioxide released from the air filter is supplied to the gas-liquid mixing device 12 through the intake passage 13. .. As a result, in the gas-liquid mixing device 12, a gas having a carbon dioxide concentration higher than that in the atmosphere is mixed with water.

As the heating means of the carbon dioxide generator 14, for example, an electric heater such as a sheathed heater, a rubber heater, a PTC (Positive Temperature Coefficient) heater, a ceramic heater, or a band heater can be used. In this case, the air filter can be efficiently heated by arranging the electric heater so as to cover the air filter or arranging the electric heater so as to be embedded inside the air filter.

In the carbon dioxide generator 14, the temperature of the air filter when heated by the heating means is preferably in the range of 40 ° C to 100 ° C. When the temperature is 40 ° C. or higher, the release rate of carbon dioxide adsorbed on the air filter can be sufficiently increased. When the temperature is 100 ° C. or lower, the energy consumption can be relatively low.

The heating means of the carbon dioxide generator 14 is not limited to the electric heater. For example, the air filter of the carbon dioxide generator 14 may be heated by the heat of the hot water derived from the hot water storage tank 2 or the bathtub 10. For example, by providing a heat transfer flow path capable of transferring heat to the air filter of the carbon dioxide generator 14, and a switching means for switching between a state in which hot water flows and a state in which hot water does not flow in the heat transfer flow path, the heat transfer flow path is provided. It is possible to switch between a state in which hot water is flowed to heat the air filter and a state in which the air filter is kept at room temperature without flowing hot water in the heat transfer flow path.

The method for producing the air filter containing the alkylamine derivative provided in the carbon dioxide generator 14 is not particularly limited, and for example, the method according to the following procedure may be used.
(1) Prepare a carrier having pores or layers capable of holding an alkylamine derivative. The carrier may contain, for example, at least one of polymethylmethacrylate, silica, alumina, clay mineral, silica alumina, magnesia, zirconia, and zeolite.
(2) A solid absorbent is prepared by dissolving the alkylamine derivative in a solvent, mixing it with the above carrier, and then removing the solvent by a heating / depressurizing operation or the like. The solid absorbent may be prepared by directly mixing the alkylamine derivative and the carrier without using a solvent.
(3) Prepare an air filter base material having air permeability. The air filter base material may be composed of, for example, at least one of felt, non-woven fabric, woven fabric, and mesh. By holding the solid absorbent material on the air filter base material, an air filter containing an alkylamine derivative can be obtained.

In the present embodiment, the air filter of the carbon dioxide generator 14 contains an alkylamine derivative, so that carbon dioxide in the air is adsorbed and carbon dioxide is released by heating with particularly excellent efficiency. Is possible. As the alkylamine derivative, for example, a derivative of lower amines represented by C _n H _{2n + 1} NH ₂ (n is an arbitrary integer of 1 to 4) can be used.

In this embodiment, another amine compound may be used instead of the alkylamine derivative, and even in that case, the same effect as described above can be obtained.

Next, the operation of the first embodiment will be described. FIG. 3 is a flowchart showing an example of the operation of the water heater 1A according to the first embodiment. In step S1 of FIG. 3, when the user presses a predetermined button of the terminal device 7 for starting hot water filling, the control device 6 starts supplying hot water to the bathtub 10. The process proceeds to step S2, and hot water adjusted to the temperature set by the user is supplied into the bathtub 10 from the hot water storage tank 2 through the hot water outlet flow path 5 and the reheating circulation flow path 4.

In step S2, it is as follows. The control device 6 closes the solenoid valve 15. Therefore, no gas is supplied to the gas-liquid mixing device 12, and no bubbles are generated from the gas-liquid mixing device 12. Further, in the control device 6, the heating means of the carbon dioxide generator 14 does not heat the air filter, and carbon dioxide is not emitted from the carbon dioxide generator 14. As described above, in the present embodiment, when the hot water is supplied to the bathtub 10, the heating means is operated in the carbon dioxide generator 14 so as not to heat the air filter. When supplying hot water to the bathtub 10, it is not necessary to supply carbon dioxide to the bathtub 10 because it is before the user takes a bath.

The process proceeds to step S3, and when the water level in the bathtub 10 reaches the water level set by the user, the control device 6 stops the hot water supply and the hot water filling is completed. Although not shown, the water level in the bathtub 10 can be detected by the integrated flow rate of the water level sensor installed in the reheating circulation flow path 4 or the flow rate sensor installed in the hot water discharge flow path 5.

When the user presses a predetermined button of the terminal device 7 for supplying carbon dioxide to the bathtub 10, the process proceeds to step S4 and the carbon dioxide supply operation is started. The process proceeds to step S5, and the control device 6 opens the solenoid valve 15 and operates the circulation pump 4d. The process proceeds to step S6, and the control device 6 controls the carbon dioxide generator 14 so that the heating means heats the air filter. As a result, carbon dioxide adsorbed on the air filter is released and supplied to the gas-liquid mixing device 12 through the intake passage 13. In this way, bubbles containing carbon dioxide supplied from the carbon dioxide generator 14 are generated by the gas-liquid mixing device 12, and bath water containing the bubbles flows into the bathtub 10 (step S7).

When the control device 6 stops the operation of supplying carbon dioxide, the process proceeds to step S8, the solenoid valve 15 is closed, the circulation pump 4d is stopped, and the heating of the air filter in the carbon dioxide generator 14 is stopped. do. As a result, the carbon dioxide supply operation ends (step S9). The control device 6 ends the carbon dioxide supply operation, for example, when a certain time has elapsed from the start of the carbon dioxide supply operation. Further, when the user presses a predetermined button of the terminal device 7 for ending the carbon dioxide supply operation, the control device 6 ends the carbon dioxide supply operation.

In the present embodiment, by supplying carbon dioxide to the bath water in the bathtub 10, the effects expected to be obtained by the hot water containing carbon dioxide, for example, recovery from fatigue, reduction of muscle pain, heat retention, and reduction of blood pressure. Etc. (hereinafter referred to as "warm bath effect") can be provided to the bather.

In the present embodiment, since the carbon dioxide generator 14 does not require a decompression pump, the carbon dioxide generator 14 can be arranged in a space-saving manner with less noise. Further, in the present embodiment, unlike the carbon dioxide gas cylinder, the carbon dioxide generator 14 does not require frequent replacement, so that maintenance is less troublesome.

In the present embodiment, carbon dioxide can be supplied by bubbles generated by the gas-liquid mixing device 12, particularly fine bubbles. Since such bubbles tend to adhere to the skin of the bather in the bathtub 10, the warm bath effect can be further improved.

In the present embodiment, in the carbon dioxide supply operation, bubbles having a distribution peak in the range of 100 nm to 10 μm in diameter and / or bubbles having a peak distribution in the range of 20 μm to 500 μm in diameter are provided. It is preferable to generate it. Fine bubbles having a distribution peak in the range of 100 nm to 10 μm in diameter are particularly liable to adhere to the skin of the bather, so that the warm bath effect can be further improved. The relatively large bubbles having a distribution peak in the range of 20 μm to 500 μm in diameter can be expected to have a physical effect on the skin of the bather. By adjusting the intake amount with the solenoid valve 15, the diameter of the bubbles generated by the gas-liquid mixing device 12 can be controlled. When the intake amount is small, the bubble diameter becomes small, and when the intake amount is large, the bubble diameter becomes large. Therefore, by operating the single gas-liquid mixing device 12 by changing the amount of intake air, bubbles having a distribution peak in the range of 100 nm to 10 μm in diameter and a peak of distribution in the range of 20 μm to 500 μm in diameter can be generated. It is possible to generate both bubbles and bubbles. Further, a gas-liquid mixing device for generating bubbles having a distribution peak in the diameter range of 100 nm to 10 μm and a gas-liquid mixing device for generating bubbles having a distribution peak in the diameter range of 20 μm to 500 μm are separately provided. You may do it. The diameter of the bubbles generated by the gas-liquid mixing device 12 can be measured by, for example, an image analysis method, a laser diffraction / scattering method, or the like.

In the present embodiment, the following effects can be obtained by performing the carbon dioxide supply operation using the gas-liquid mixing device 12 arranged in the reheating circulation flow path 4 connected to the bathtub 10. The flow of bath water generated in the bathtub 10 exerts a physical action on the skin of the bather, so that a synergistic effect with the hot bath effect of carbon dioxide can be obtained.

In the present embodiment, the carbon dioxide generated from the carbon dioxide generator 14 can be supplied into the bathtub 10 by using the reheating circulation flow path 4 having the reheating heat exchanger 4a, so that the number of additional parts is small. It is possible to reduce the cost.

The hot water supply device 1A of the present embodiment is generated by the gas-liquid mixing device 12 by opening the solenoid valve 15 and operating the circulation pump 4d in the carbon dioxide generator 14 without the heating means heating the air filter. An operation mode for supplying the generated air bubbles into the bathtub 10 may be provided. This operation mode is referred to as "normal bubble supply operation". In the normal bubble supply operation, carbon dioxide is not discharged from the air filter of the carbon dioxide generator 14, so that normal bubbles having a low carbon dioxide concentration are supplied into the bathtub 10. It is desirable that the user operates the terminal device 7 so that the carbon dioxide supply operation described above and the normal bubble supply operation can be easily selected.

In the normal bubble supply operation, when the external air passes through the air filter of the carbon dioxide generator 14 and flows into the intake passage 13, when the carbon dioxide in the air is adsorbed by the air filter, the gas-liquid mixing device 12 The concentration of carbon dioxide in the air supplied to is lower than the concentration of carbon dioxide in the air. On the other hand, in this case, if the amount of carbon dioxide adsorbed by the air filter of the carbon dioxide generator 14 is saturated, carbon dioxide is no longer adsorbed by the air filter, so that it is in the air supplied to the gas-liquid mixing device 12. The carbon dioxide concentration is equal to the carbon dioxide concentration in the atmosphere.

Each function of the control device 6 may be realized by a processing circuit. The processing circuit of the control device 6 may include at least one processor and at least one memory. At least one processor may realize each function of the control device 6 by reading and executing a program stored in at least one memory. The processing circuit of the control device 6 may include at least one dedicated hardware. The configuration is not limited to the configuration in which the operation is controlled by a single control device 6, and the operation may be controlled by the cooperation of a plurality of control devices.

Embodiment 2.
Next, the second embodiment will be described with reference to FIG. 4, but the differences from the first embodiment described above will be mainly described, and the same or corresponding parts will be simplified or omitted.

FIG. 4 is a diagram showing a water heater 1B according to the second embodiment. As shown in FIG. 4, the hot water supply device 1B of the second embodiment further includes a blower 16 in addition to the same configuration as the hot water supply device 1A of the first embodiment. The blower 16 is an example of a blowing means capable of blowing air to the air filter of the carbon dioxide generator 14.

A branch passage 17 branches from an intake passage 13 between the carbon dioxide generator 14 and the solenoid valve 15. When the blower 16 is operated, the blower 16 causes the air taken in from the outside to flow into the branch passage 17. The second solenoid valve 18 installed in the branch passage 17 opens and closes the branch passage 17.

At the time of the carbon dioxide supply operation and the normal bubble supply operation in the second embodiment, the results are as follows. During the carbon dioxide supply operation and the normal bubble supply operation, the blower 16 is stopped and the second solenoid valve 18 is closed. In that state, the carbon dioxide supply operation and the normal bubble supply operation can be executed as in the first embodiment.

When the carbon dioxide supply operation and the normal bubble supply operation are not performed, the control device 6 can perform a blow operation for blowing air to the air filter of the carbon dioxide generator 14. In the blast operation, it is as follows. The solenoid valve 15 is closed, the second solenoid valve 18 is opened, and the blower 16 is operated. The air taken in by the blower 16 passes through the branch passage 17, flows back through the intake passage 13, passes through the air filter of the carbon dioxide generator 14, and is discharged to the outside. By performing the ventilation operation, air is forcibly circulated through the air filter of the carbon dioxide generator 14, and the air filter efficiently adsorbs carbon dioxide in the air.

Before the carbon dioxide supply operation, it is desired to secure a sufficient amount of carbon dioxide adsorbed by the air filter of the carbon dioxide generator 14. In the present embodiment, by performing the above-mentioned ventilation operation, it is possible to efficiently adsorb carbon dioxide in the air to the air filter of the carbon dioxide generator 14 in a short time.

1A, 1B hot water supply device, 2 hot water storage tank, 3 water supply adapter, 4 reheating circulation flow path, 4a reheating heat exchanger, 4d circulation pump, 5 hot water flow path, 6 control device, 7 terminal device, 10 bathtub, 12 air Liquid mixer, 13 intake passage, 14 carbon dioxide generator, 15 electromagnetic valve, 16 blower, 17 branch passage, 18 second electromagnetic valve

Claims (11)

A gas-liquid mixer that mixes the gas supplied through the intake passage with water,
A carbon dioxide generator capable of supplying carbon dioxide into the intake passage and
Equipped with
The carbon dioxide generator includes an adsorption means for adsorbing carbon dioxide in the air and a heating means for heating the adsorption means so that the carbon dioxide adsorbed by the adsorption means is released.
The adsorption means includes an air filter containing an amine compound.
The air filter includes an air filter base material and a solid absorbent material held by the air filter base material.
The solid absorbent comprises a carrier having pores or layers and the amine compound retained in the pores or layers.
It ’s a water heater ,
Further provided with an air blowing means capable of blowing air to the adsorption means,
When the heating means heats the adsorption means to supply carbon dioxide released from the adsorption means into the intake passage, the blower means is stopped and the carbon dioxide supply operation is not executed. A hot water supply device that sometimes adsorbs carbon dioxide in the air to the air filter of the adsorption means by operating the ventilation means. The adsorption means comprises an alkylamine derivative as the amine compound and comprises.
The water heater according to claim 1, wherein the alkylamine derivative is a derivative of lower amines represented by Cn H _{2n + 1} NH ₂ ( _n is an arbitrary integer of 1 to 4). The hot water supply device according to claim 1 or 2, wherein at least a part of the air filter has a honeycomb shape or a corrugated shape. The hot water supply device according to any one of claims 1 to 3, wherein the temperature of the adsorption means when heated by the heating means is in the range of 40 ° C to 100 ° C. The hot water supply device according to any one of claims 1 to 4, wherein the gas-liquid mixing device is arranged in a circulation flow path connected to a bathtub. The claim that the carbon dioxide released from the carbon dioxide generator when the bath water in the bathtub flows through the circulation flow path can be mixed with the bath water by the gas-liquid mixing device and supplied into the bathtub. The hot water supply device according to 5. The hot water supply device according to claim 5 or 6, wherein the circulation flow path includes a reheating heat exchanger for heating bath water. The hot water supply device according to any one of claims 1 to 7, wherein the gas-liquid mixing device is arranged in a flow path for supplying hot water to a bathtub. The hot water supply device according to claim 8, wherein when hot water is supplied to the bathtub, the heating means is operated so as not to heat the adsorption means. The gas-liquid mixer according to claim 1 to 9 , wherein the gas-liquid mixing device generates at least one of a bubble having a distribution peak in the range of 100 nm to 10 μm in diameter and a bubble having a distribution peak in the range of 20 μm to 500 μm in diameter. The hot water supply device according to any one of the items. The gas-liquid mixing device is arranged in the circulation flow path connected to the bathtub.
The gas-liquid mixing device can generate a first bubble having a distribution peak in the range of 100 nm to 10 μm in diameter and a second bubble having a distribution peak in the range of 20 μm to 500 μm in diameter.
The carbon dioxide supply in which carbon dioxide released from the carbon dioxide generator when the bath water in the bathtub flows through the circulation flow path is mixed with the bath water by the gas-liquid mixing device and supplied into the bathtub. The action is feasible and
The hot water supply device according to any one of claims 1 to 4, wherein the gas-liquid mixing device generates the first bubble and the second bubble during the carbon dioxide supply operation.

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