JP6939013B2 - Water heater - Google Patents

Description

The present invention relates to a hot water supply device.

There are two types of heat sources for hot water supply devices, gas and electricity, and a heat pump type hot water supply device is known as a method using electricity as a heat source. The heat pump type hot water supply device is mainly composed of a heat pump unit which is a hot water generator and a hot water storage tank unit which stores hot water. Carbon dioxide circulates in the heat pump unit as a natural refrigerant (hereinafter referred to as "refrigerant"), and the refrigerant absorbs heat in the atmosphere. Then, in the compressor in the heat pump unit, the refrigerant that has absorbed heat is compressed by using electric power. As a result, the refrigerant becomes in a high pressure state and generates high heat.

By the way, at present, the temperature of hot water supplied by the heat pump type water heater, that is, the lower limit of the hot water discharge temperature is set to around 65 degrees. However, hot water as high as 65 degrees is often unnecessary when heat demand is low, such as in summer. However, the reason why the lower limit of the hot water temperature is set to around 65 degrees is to prevent the growth of bacteria, especially Legionella bacteria, in the hot water stored in the hot water storage tank unit.

For the above purpose, it is not possible to lower the lower limit of the hot water temperature at present, and despite the summer season when the demand for hot water is low, hot water with a high temperature is generated to prevent the growth of bacteria. , The situation is that we have no choice but to waste power. Therefore, in order to reduce power consumption by lowering the lower limit of the hot water temperature, it is necessary to prevent the growth of Legionella bacteria when the hot water temperature is low.

Silver ions, antibacterial agents, ozone, ultraviolet sterilization, etc. are known as means for suppressing the growth of Legionella bacteria, but among them, ultraviolet sterilization does not generate by-products in the reaction pathway and has high bactericidal activity. known. Ultraviolet rays having a wavelength of 200 to 350 nm not only act on nucleic acids, which are the protoplasm of bacteria, to deprive them of their ability to grow, but also have the effect of destroying the protoplasm and killing the bacteria. Sterilization can be performed by irradiating water. As a light source of such ultraviolet rays, a low-pressure mercury lamp (so-called sterilization lamp) that emits light having a wavelength of 253.7 nm (mercury resonance line) generated by discharging low-pressure (about 0.1 Pa) mercury vapor is used. It is common and the sterilization lamp is widely used in various fields. Further, in recent years, there have been an increasing number of cases in which an ultraviolet light emitting diode (hereinafter referred to as UV-LED) is used as a light source of ultraviolet rays for sterilization (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-203095

When using an ultraviolet sterilizer composed of UV-LEDs to sterilize hot water, heat does not accumulate in the ultraviolet light emitting parts such as UV-LEDs in order to exert a certain sterilization effect and not reduce it. It is necessary to dissipate heat. A heat dissipation part is required to dissipate heat from the ultraviolet light emitting part, and if the heat dissipation part is large, there is a problem that the place where the ultraviolet sterilizer can be installed in the hot water supply device in which the hot water piping is complicatedly configured is restricted. ..

The present invention has been made to solve the above-mentioned problems, and it is possible to cool the ultraviolet light emitting part by adopting a structure in which heat generated from the ultraviolet light emitting part is radiated to parts in a hot water supply device. At the same time, it is an object of the present invention to obtain a hot water supply device that improves the degree of freedom in installing an ultraviolet sterilizer equipped with an ultraviolet light emitting unit.

The hot water supply device according to the present invention includes a hot water storage tank for storing heated water supplied to a tub and a general hot water supply destination, a bath-side circulation pipe for heating the water in the tub, and a hot water storage tank. A tank-side circulation pipe for absorbing heat from the heated water, a reheating heat exchanger arranged in the bath-side circulation pipe and the tank-side circulation pipe, and a hot water storage tank for heating the water in the hot water storage tank. Passes through the hot water storage circulation pipe, the heat source machine arranged in the hot water storage circulation pipe to heat water, and the piping that constitutes any of the bath side circulation pipe, the tank side circulation pipe, and the hot water storage circulation pipe. includes an ultraviolet light emitting portion for the water to be irradiated with ultraviolet rays, a heat radiation portion for radiating heat of the ultraviolet light-emitting portion to the pipe, the heat radiating portion includes a pipe and different materials, the inside of the heat radiating portion through the water includes a first reflecting section for reflecting ultraviolet rays on the inner surface of the pipe, a shall comprise a second reflecting part for reflecting ultraviolet rays on the inner surface of the heat radiating portion.

The hot water supply device of the present invention has an effect that the ultraviolet light emitting portion can be easily cooled and the degree of freedom of installing an ultraviolet sterilizer for sterilizing hot water can be improved.

It is the schematic which shows the hot water supply apparatus of Embodiment 1 of this invention. It is sectional drawing which shows the ultraviolet sterilizer of Embodiment 1 of this invention. It is sectional drawing which shows the 1st modification in the ultraviolet sterilization apparatus of Embodiment 1 of this invention. It is sectional drawing which shows the 2nd modification in the ultraviolet sterilization apparatus of Embodiment 1 of this invention. It is the schematic which shows the hot water supply apparatus of Embodiment 2 of this invention. It is sectional drawing which shows the ultraviolet sterilizer of Embodiment 2 of this invention. It is the schematic which shows the hot water supply apparatus of Embodiment 3 of this invention.

The present invention will be described in detail with reference to the accompanying drawings. In each figure, the same or corresponding parts are designated by the same reference numerals. Overlapping description will be simplified or omitted as appropriate.

Embodiment 1.
FIG. 1 is a configuration diagram showing a hot water supply device including the sterilizer of the first embodiment. As shown in FIG. 1, the hot water supply device 1 of the first embodiment includes a main body 2, a heat source machine 3, a control unit 4 that controls the operation of the hot water supply device 1, an instruction to the control unit 4, and the control unit 4. It is composed of a remote control unit 5 indicating the state of. The main body 2 has a hot water storage tank 6, and a bathtub 7 and a general hot water supply destination 9 are connected to the other end as a destination for supplying heated water discharged from the hot water storage tank 6. The control unit 4 and the remote control unit 5 show specific configurations of the control means and the input display means, respectively.
Since the hot water in the hot water storage tank 6 is heated by the heat source machine 3, a hot water storage circulation pipe 8 is provided. An ultraviolet sterilizer 10 is arranged to sterilize the hot water passing through the hot water storage circulation pipe 8. The ultraviolet sterilizer 10 generates heat when emitting ultraviolet rays, and in order to cool the ultraviolet sterilizer 10, the structure is such that heat is dissipated to the return pipe 8b, the water in the return pipe 8b, and the air around the return pipe 8b. ing.

Further, in order to heat the water supplied to the bathtub 7, a bath-side circulation pipe 12 is provided, which exits the bathtub 7, passes through the reheating heat exchanger 11, and returns to the bathtub 7 again. A bath-side water supply pump 13 is provided so that the hot water in the bathtub 7 circulates in the road 12. The reheating heat exchanger 11 is also connected to the tank side circulation pipe 14 which is discharged from the hot water storage tank 6 and returns to the hot water storage tank 6 again, and the heated water in the hot water storage tank 6 is sent to the tank side water supply pump 15. The water in the bath-side circulation pipe 12 passing through the reheating heat exchanger 11 is warmed by circulating the water.

The heat source machine 3 includes a compressor 20 that compresses the refrigerant, a heat exchanger 21 for boiling that corresponds to a radiator, an expansion valve 22, an evaporator 23, and a circulation pipe 24 that connects these in an annular shape. It has a refrigeration cycle unit 25 that has been removed. In the refrigeration cycle unit 25, after the refrigerant such as carbon dioxide is compressed by the compressor 20 to reach a high temperature and high pressure, heat is dissipated by the boiling heat exchanger 21, the pressure is reduced by the expansion valve 22, and heat is absorbed by the evaporator 23. It becomes a gas state and is sucked into the compressor 20. When carbon dioxide is used as the refrigerant, it is preferable to operate under conditions exceeding the critical pressure of the carbon dioxide on the high pressure side.

The boiling heat exchanger 21 is connected to the inside of the hot water storage circulation pipe 8 which is discharged from the hot water storage tank 6 and returns to the inside of the hot water storage tank 6 again. The amount of heat obtained by the heat source machine 3 heats the water circulating in the hot water storage circulation pipe 8 via the boiling heat exchanger 21. A water storage pump 26 is provided to circulate the water in the hot water storage circulation pipe 8.

On the other hand, the main body 2 includes a hot water storage tank 6, a hot water storage circulation line 8, a reheating heat exchanger 11, a bath side circulation line 12, a tank side circulation line 14, a water supply line 30, and a first hot water supply line 31. , Bath side hot water mixing valve 32a, general side hot water mixing valve 32b, second hot water supply pipe 33, third hot water supply pipe 34 and the like.

The hot water storage tank 6 is a laminated tank that stores the water supplied from the water supply pipe line 30 and also stores the hot water boiled by the heat source machine 3. At the lower part of the hot water storage tank 6, a water introduction port 6a to which the water supply pipe line 30 is connected and a water outlet port 6b to which the outgoing pipe 8a of the hot water storage circulation pipe line 8 is connected are provided. A hot water introduction port 6c to which the return pipe 8b of the hot water storage circulation pipe 8 is connected and a hot water outlet 6d to which the first hot water supply pipe 31 is connected are provided above the hot water storage tank 6. The hot water storage tank 6 is always kept full by the water supply from the water supply pipe line 30.

Although not shown, a temperature sensor for detecting the temperature of the hot water flowing from the hot water storage tank 6 into the tank side circulation pipe 14 and the first hot water supply pipe 31 is attached to the upper part of the hot water storage tank 6. There is. Further, a plurality of temperature sensors for detecting the temperature of the hot water in the hot water storage tank 6 are mounted on the peripheral surface of the hot water storage tank 6 at different mounting heights.

The water supply pipe line 30 is a pipe line that supplies water such as city water to the hot water storage tank 6, the bath side hot water mixing valve 32a, the general side hot water mixing valve 32b, and the general hot water supply destination 9, and is the pressure reducing valve 35 and the first to first. It has a third water supply pipe portion 30a to 30c. The pressure reducing valve 35 is provided in the middle of the first water supply pipe portion 30a, and reduces the water pressure from a water source such as tap water to a predetermined value. The first water supply pipe portion 30a connects the water source and the water inlet 6a of the hot water storage tank 6, and the second water supply pipe portion 30b is branched from the first water supply pipe portion 30a by the pressure reducing valve 35 and the first water supply pipe portion 30a. The 30a, the bath side hot water mixing valve 32a, and the general side hot water mixing valve 32b are connected, and the third water supply pipe portion 30c branches from the first water supply pipe portion 30a on the upstream side of the pressure reducing valve 35, and the first water supply pipe portion 30c is connected. Connect 30a and the general hot water supply destination 9. Although not shown, the second water supply pipe portion 30b is provided with a temperature sensor for detecting the temperature of the water in the second water supply pipe portion 30b.

The general hot water supply destination 9 is a hot water supply destination that the user directly operates by hand to open the cap (including the case where the cap is opened by making the sensor sensitive). Is.

The hot water storage circulation pipe 8 is a pipe that reaches the hot water introduction port 6c at the upper part of the hot water storage tank 6 from the water outlet 6b at the lower part of the hot water storage tank 6 via the boiling heat exchanger 21 of the heat source machine 3. It has an outgoing pipe 8a provided with a water supply pump 26 and a return pipe 8b. The outgoing pipe 8a connects the water outlet 6b and the boiling heat exchanger 21, and the return pipe 8b connects the boiling heat exchanger 21 and the hot water introduction port 6c.

The tank-side circulation pipe 14 is a pipe that reaches the lower part of the hot water storage tank 6 from the hot water outlet 6d at the upper part of the hot water storage tank 6 via the heat exchanger 11 for reheating. It has a return pipe 14b provided with. The outgoing pipe 14a connects the hot water outlet 6d and the hot water introduction port 11a on the upper part of the reheating heat exchanger 11, and the return pipe 14b is connected to the hot water outlet 11b on the lower part of the reheating heat exchanger 11 and the lower part of the hot water storage tank 6. Connect.

The bath-side circulation pipe 12 (bath circulation pipe) is a pipe that returns from the bathtub 7 to the bathtub 7 via the reheating heat exchanger 11, and has an outward pipe 12a and a return pipe 12b. The outgoing pipe 12a connects the bathtub 7 and the bath water introduction port 11c at the lower part of the reheating heat exchanger 11, and the return pipe 12b connects the bath water outlet 11d at the upper part of the reheating heat exchanger 11 and the bathtub 7. The going pipe 12a is provided with a flow switch 36, a water level sensor 37, and a bath side water pump 13 in this order from the reheating heat exchanger 11 side to the upstream side (bathtub 7 side). Further, although not shown, the going pipe 12a is also provided with a temperature sensor for detecting the temperature of hot water in the going pipe 12a.

The flow switch 36 detects the presence or absence of water flow in the outgoing pipe 12a. The water level sensor 37 detects the water level of the bath water in the bathtub 7 from the water pressure in the going pipe 12a with reference to the mounting position of the water level sensor 37. The bath-side water supply pump 13 draws out bath water from the bathtub 7, circulates it in the bath-side circulation pipe 12, and returns it to the bathtub 7. Then, the above-mentioned temperature sensor (not shown) detects the temperature of the bath water in the going pipe 12a. A bathtub adapter 38 is provided at a connecting portion between the forward pipe 12a and the return pipe 12b and the bathtub 7.

The bathtub adapter 38 is provided with two pipe connection portions so that the forward pipe 12a and the return pipe 12b can be connected.

The bath hot water supply device 1 further includes a control unit 4 and a remote control unit 5 installed on a wall of a bathroom or kitchen. The user can set the hot water supply temperature, set various operation modes, and the like with the remote controller unit 5. The control unit 4 has a heat source machine 3, an ultraviolet sterilizer 10, a bath side water pump 13, a tank side water pump 15, and a heat source machine 3, based on the information detected by each of the above-mentioned sensors and the information transmitted from the remote control unit 5. By controlling the hot water storage pump 26, the hot water mixing valve 32a on the bath side, and the hot water mixing valve 32b on the general side, various operations of the hot water supply device 1 are controlled.

When hot water is supplied to the bathtub 7, the high-temperature hot water supplied from the hot water storage tank 6 and the water supplied from the water supply pipe line 30 are mixed by the hot water mixing valve 32a on the bath side so as to reach a set temperature, and the mixture is mixed. The hot water is sent through the second hot water supply pipe 33 and the bath side circulation pipe 12, and is supplied into the bathtub 7 via the bathtub adapter 38.

When hot water is supplied to the general hot water supply destination 9, the high temperature hot water supplied from the hot water storage tank 6 and the water supplied from the water supply pipe line 30 are mixed by the general hot water mixing valve 32b so as to have a set temperature. The mixed hot water is sent through the third hot water supply pipe 34 and supplied to the general hot water supply destination 9.

Further, the control unit 4 may control the operation of another heating device (not shown) included in the hot water supply device 1. The remote control unit 5 may be connected to the control unit 4 so as to be capable of bidirectional data communication, and may further include 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. Further, the remote control unit 5 may be installed in the bathroom.

Next, the configuration of the ultraviolet sterilizer 10 will be described.
FIG. 2 shows a cross-sectional view of the ultraviolet sterilizer according to the first embodiment. In FIG. 2, (a) is a cross section in a direction parallel to the flow of hot water passing through the return pipe 8b, showing a cross-sectional view of a portion BB of (b), and (b) is hot water passing through the return pipe 8b. It is a cross section in the direction perpendicular to the water flow of (a), and shows the cross section of the part AA of (a).

The ultraviolet sterilizer 10 includes a UV-LED 40, which is a specific configuration of an ultraviolet light emitting unit, an LED substrate 41 for installing the UV-LED 40, and a heat radiating unit 42 for radiating heat generated from the UV-LED 40. It has. The UV-LED 40 and the LED substrate 41 are incorporated within the thickness of the return tube 8b, and the inside of the return tube 8b is a reflecting portion 43 that reflects ultraviolet rays, so that the return tube 8b can be irradiated over a wide range. , The sterilization efficiency for hot water can be improved. The UV-LED 40 is controlled by a constant current supplied from a power source (not shown). The arrows in FIG. 2 schematically show the flow of hot water.

The heat radiating unit 42 has an outer shape similar to that of the return pipe 8b, and has a structure in which the heat radiating unit 42 is cooled by heat radiation to the hot water passing through the return pipe 8b, the return pipe 8b, and the outside air. The heat radiating section 42 and the return tube 8b may have an integral structure or a detachable structure. When the ultraviolet sterilizer 10 provided with the radiating section 42 has a detachable structure, the return tube 8b returns to the heat radiating section 42. It is equipped with a detachable part (not shown) for attaching and detaching.

By cooling the UV-LED 40 by the heat radiating unit 42, it is possible to extend the life of the UV-LED 40 and prevent a decrease in the bactericidal effect due to a decrease in the ultraviolet intensity. Further, the ultraviolet sterilizer 10 can be easily arranged in the hot water supply device 1, and the degree of freedom in installing the ultraviolet sterilizer 10 is improved.
The ultraviolet sterilizer 10 is not limited to the configuration arranged in the return pipe 8b, and may be arranged in the bath side circulation pipe 12, the tank side circulation pipe 14, the first hot water supply pipe 31, or the like.
Further, the ultraviolet sterilizer 10 may be arranged at a position where heat can be dissipated to a component having a material having high thermal conductivity in the hot water supply device 1.

The parts having high thermal conductivity in the hot water supply device 1 that dissipates heat from the heat radiating unit 42 accommodate the hot water storage tank 6, the tank side circulation pipe 14, the hot water storage circulation pipe 8, the bath side circulation pipe 12, and at least the main body 2. The hot water supply device housing may be configured such that the heat radiating portion 42 is arranged at a position where heat is radiated to at least one of these parts. The UV-LED 40 can be cooled by absorbing the heat generated from the heat radiating unit 42 by a component having high thermal conductivity.

Further, the material of the pipe to which the ultraviolet sterilizer 10 is attached and the heat radiating portion 42 is preferably a component having high thermal conductivity, for example, copper, aluminum, copper tungsten alloy, copper molybdenum alloy, nitride. It may be composed of one or more materials of an alloy of ceramics / metal such as aluminum, Al-SiC, Mg-SiC, and diamond. The material of the pipe to which the ultraviolet sterilizer 10 is attached and the heat radiating part 42 may be made of the same or different materials.
As for the above-mentioned parts having high thermal conductivity, the material having high thermal conductivity may be a component having high thermal conductivity as a whole, or the surface may be coated, and the material may be adhered and welded.

When the heat radiating part 42 is air-cooled, the heat exchange and heat are radiated by the air touching the pipes such as the hot water supply device housing, the water supply pipe line 30, and the bath circulation pipe line 12, and the heat radiating part 42 is cooled. It may be. Further, it may be configured to be attached to a pipe in the hot water supply device 1 which does not have an adjacent pipe and can efficiently exchange heat with air.

The reflection unit 43 may be the reflection unit 43 only inside the pipe through which hot water in the vicinity of the UV-LED 40 is arranged, or the entire surface inside the pipe.

Next, the operation of the hot water supply device 1 will be described. Tap water is supplied into the hot water storage tank 6 from the water supply pipe line 30. When the hot water storage tank 6 is filled, the hot water storage pump 26 operates and circulates in the hot water storage circulation pipe 8. The circulating water is heated by the amount of heat obtained by the heat source machine 3 via the boiling heat exchanger 21, and when the water in the hot water storage tank 6 reaches a predetermined temperature or higher, the hot water storage pump 26 stops. Then, the boiling is completed. The hot water boiled in the hot water storage tank 6 is supplied to the bathtub 7 or the general hot water supply destination 9 according to the operation of the user. By supplying the hot water to the bathtub 7 or the general hot water supply destination 9, the amount of hot water in the hot water storage tank 6 is additionally replenished from the water supply pipe line 30 into the hot water storage tank 6. As such an operation is repeated, the temperature of the hot water in the hot water storage tank 6 decreases, so when the temperature becomes lower than the predetermined temperature, the boiling operation is performed again.

When the temperature of the hot water in the hot water storage tank 6 decreases, the growth of bacteria in the hot water storage tank 6 increases. Therefore, when the temperature of the hot water in the hot water storage tank 6 drops, a predetermined time elapses after the temperature drops, or when the temperature of the hot water in the hot water storage tank 6 falls below the predetermined temperature, the ultraviolet sterilizer 10 is periodically connected. By operating the hot water storage water pump 26 arranged in the hot water storage circulation pipe 8 and inputting power to the ultraviolet sterilizer 10, the UV-LED 40 is made to emit light, and the hot water storage circulation pipe 8 is emitted by ultraviolet rays. Sterilize the hot water inside.

The ultraviolet sterilizer 10 may periodically perform an operation of irradiating ultraviolet rays while the hot water storage pump 26 arranged in the hot water storage circulation path 10 is operating. By sterilizing the hot water with the ultraviolet rays, the temperature of the hot water in the hot water storage tank 6 can be set lower than before.

Next, a modified example of the ultraviolet sterilizer 10 will be described.
FIG. 3 is a schematic view showing a first modification of the ultraviolet sterilizer according to the first embodiment. In FIG. 3, the heat radiating portion 32 is configured to be arranged in a part of the outer shape of the return pipe 8b.
FIG. 4 is a schematic view showing a second modification of the ultraviolet sterilizer according to the first embodiment. In FIG. 4, a window portion 44 that transmits ultraviolet rays is installed in the return pipe 8b. The UV-LED 40, the LED substrate 41, and the heat radiating portion 42 are arranged outside the window portion 44, and the ultraviolet rays from the UV-LED 40 pass through the window portion 44 and are irradiated to the hot water.
When the ultraviolet sterilization apparatus 10 shown in FIGS. 2 to 4 is arranged on the return tube 8b, there is no restriction on the direction of gravity. For example, the UV-LED 40 is arranged on the upper side of the return tube 8b to sterilize hot water. The structure may be such that

Embodiment 2.
In the hot water supply device shown in the present embodiment, the arrangement of the outgoing pipe 8a adjacent to the ultraviolet sterilizer 10 is different from that in the first embodiment. The same configuration as that of the first embodiment is assigned the same number, and the description thereof will be omitted.
FIG. 5 is a schematic view showing a water heater according to a second embodiment of the present invention. In FIG. 5, the ultraviolet sterilizer 10 is arranged in the hot water storage circulation pipe 8. When hot water circulates in the return pipe 8b of the hot water storage circulation pipe 8, the hot water is sterilized by irradiating the hot water with ultraviolet rays. An outgoing pipe 8a is arranged adjacent to the ultraviolet sterilizer 10 so as to cool the ultraviolet sterilizer 10.

The arrangement of the ultraviolet sterilizer 10 is not limited to the hot water storage circulation pipe 8, but one of the bath side circulation pipe 12 and the tank side circulation pipe 14, or all of these circulation pipes. It may be configured to be incorporated in. The heat radiating portion 42 of the ultraviolet sterilizer 10 has a structure similar to the outer shape of the return pipe 8b, and the heat radiating portion 42 is cooled by exchanging heat with the outgoing pipe 8a in contact with the heat radiating portion 42.

FIG. 6 is a cross-sectional view showing a sterilizer according to a second embodiment of the present invention. In FIG. 6, (a) is a cross section in a direction parallel to the flow of hot water passing through the return pipe 8b, showing a cross-sectional view of a portion BB of (b), and (b) is hot water passing through the return pipe 8b. It is a cross section in the direction perpendicular to the water flow of (a), and shows the cross section of the part AA of (a).

The ultraviolet sterilizer 10 includes a UV-LED 40, an LED substrate 41, and a heat radiating unit 42. The UV-LED 40 and the LED substrate 41 are incorporated within the thickness of the return tube 8b, and the inside of the return tube 8b is a reflecting portion 43 that reflects ultraviolet rays, so that the return tube 8b can be irradiated over a wide range. , The sterilization efficiency can be improved. The UV-LED 40 is controlled by a constant current supplied from a power source (not shown).

The heat radiating portion 42 has an outer shape similar to that of the return pipe 8b, and has a structure in which the outer shape portion is in contact with the outgoing pipe 8a, and the heat radiating portion 42 is cooled by hot water passing through the outgoing pipe 8a. .. The heat radiating portion 42 may be arranged in a part of the outer shape of the return pipe 8b shown in FIG.
The arrows in FIG. 6 schematically indicate the flow of hot water. Further, the outgoing pipe 8a shows a specific configuration of a cooling means for the heat radiating portion 42.

The ultraviolet sterilizer 10 is not limited to the configuration adjacent to the outgoing pipe 8a, and may have a structure adjacent to the water supply pipe line 30 through which tap water passes, the circulation pipe 24 through which the refrigerant passes, and the like.
Further, it may be arranged at a position where heat can be dissipated to a component having a material having high thermal conductivity of the hot water supply device 1.

The parts having high thermal conductivity in the hot water supply device 1 that dissipates heat from the heat radiating unit 42 accommodate the hot water storage tank 6, the hot water storage circulation pipe 8, the bath side circulation pipe 12, the tank side circulation pipe 14, and at least the main body 2. The heat radiating unit 42 may be arranged at a position in which the hot water supply device housing is in contact with at least one of these parts. The UV-LED 40 can be cooled by absorbing the heat generated from the heat radiating unit 42 by a component having high thermal conductivity.

Further, the heat from the heat radiating portion 42 of the ultraviolet sterilizer 10 may be configured to be used for heating the water passing through the hot water storage circulation pipe 8.

Embodiment 3.
In the hot water supply device shown in the present embodiment, the arrangement of the ultraviolet sterilizer 10 and the hot water storage tank 6 is different from that of the first embodiment. The same configuration as that of the first embodiment is assigned the same number, and the description thereof will be omitted.
FIG. 7 is a schematic view showing a water heater according to the third embodiment of the present invention. In FIG. 7, the ultraviolet sterilizer 10 is arranged in a pipe branched from the return pipe 8b, and is arranged in the hot water storage tank 6 at a position where heat is dissipated from the heat radiating portion 42. The heat radiating unit 42 may be configured to be in contact with the hot water storage tank 6. Further, the ultraviolet sterilizer 10 is not limited to being arranged in the hot water storage circulation pipe 8, and may be arranged in the tank side circulation pipe 14 or the first hot water supply pipe 31.

When the heat radiating unit 42 is arranged at a position where heat is dissipated to the hot water storage tank 6, the heat generated from the ultraviolet sterilizer 10 can be returned to the hot water storage tank 6, the UV-LED 40 is cooled, and the inside of the hot water storage tank 6 is cooled. It becomes possible to suppress a decrease in hot water temperature.

From the above, it is possible to realize a hot water supply device that can easily cool the ultraviolet light emitting portion and improve the degree of freedom of installing an ultraviolet sterilizer for sterilizing hot water.

In the above-described first to third embodiments, the configuration in which the ultraviolet sterilizer is arranged in the hot water supply device is described, but it may be applied to other electric devices that need to be sterilized by ultraviolet rays, for example, the air conditioner sucks. It can also be applied to sterilize air.

It should be noted that the components shown in each of the above embodiments, the connection form of the components, and the like are examples, and the present invention is not limited. That is, within the range that does not deviate from the gist of the present invention, it is possible to expand the components and their connection forms to other devices, add various modifications to the components and their connection forms, and combine them. be.

1 Hot water supply device, 2 Main body, 3 Heat source machine, 4 Control unit 5 Remote control unit 6 Hot water storage tank, 6a Water inlet, 6b Water outlet, 6c Hot water inlet, 6d Hot water outlet, 7 Bathtub, 8 Circulation pipeline for hot water storage , 8a Outbound pipe, 8b Return pipe, 9 General hot water supply destination, 10 Ultraviolet sterilizer, 11 Heat exchanger for reheating, 11a Hot water inlet, 11b Hot water outlet, 11c Bath water inlet, 11d Bath water outlet, 12 Bath side circulation pipe, 12a outbound pipe, 12b return pipe, 13 bath side water supply pump, 14 tank side circulation pipe, 14a outbound pipe, 14b return pipe, 15 tank side water supply pump, 20 compressor, 21 boiling heat Exchanger, 22 Expansion valve, 23 Evaporator, 24 Circulation piping, 25 Refrigeration cycle section, 26 Hot water storage pump, 30 Water supply line, 30a 1st water supply pipe, 30b 2nd water supply pipe, 30c 3rd water supply pipe Part, 31 1st hot water supply line, 32a Bath side hot water mixing valve, 32b General side hot water mixing valve, 33 2nd hot water supply line, 34 3rd hot water supply line, 35 pressure reducing valve, 36 flow switch, 37 water level sensor, 38 Bath adapter, 40 UV-LED, 41 LED board, 42 heat dissipation part, 43 reflection part, 44 window part

Claims (5)

A hot water storage tank for storing heated water supplied to bathtubs and general hot water supply destinations,
A bath-side circulation pipe for heating the water in the bathtub,
A tank-side circulation pipe for absorbing heat from the heated water in the hot water storage tank, and
Reheating heat exchangers arranged in the bath-side circulation pipe and the tank-side circulation pipe,
A circulation pipe for hot water storage for heating the water in the hot water storage tank, and
A heat source machine arranged in the hot water storage circulation line and heating the water,
An ultraviolet light emitting unit that irradiates the water passing through the pipes constituting any of the bath side circulation pipe, the tank side circulation pipe, and the hot water storage circulation pipe with ultraviolet rays.
The pipe is provided with a heat radiating portion that dissipates heat from the ultraviolet light emitting portion .
The heat radiating portion is made of a material different from that of the piping.
The water passes through the inside of the heat dissipation part,
A first reflective portion that reflects the ultraviolet rays is provided on the inner surface of the pipe.
A hot water supply device characterized in that a second reflecting portion that reflects ultraviolet rays is provided on the inner surface of the heat radiating portion. The heat exchanger for reheating, the heat source machine, the control means for controlling the ultraviolet light emitting unit, and the control means.
The hot water supply device according to claim 1, further comprising an instruction to the control means and an input display means for indicating the state of the control means. The hot water supply device according to claim 1 or 2 , further comprising a cooling means for cooling the heat radiating portion. A water supply pipeline that supplies the water to the hot water storage tank,
The water supply pipe, the bath side circulation pipe, the tank side circulation pipe, the hot water storage circulation pipe, and the hot water supply device housing for accommodating the hot water storage tank are provided.
In at least one of the water supply pipe, the bath-side circulation pipe, the tank-side circulation pipe, the hot water storage circulation pipe, the hot water storage tank, and the hot water supply device housing. The hot water supply device according to any one of claims 1 to 3 , wherein the heat of the ultraviolet light emitting portion is dissipated. The hot water supply device according to any one of claims 1 to 4 , wherein the heat radiating unit is in contact with the lower portion of the hot water storage tank.

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