JP2021148404A - Hot water storage type water heater and installation method therefor - Google Patents

Abstract

To provide a hot water storage type water heater capable of reducing the possibility of breakage due to inundation in flood, and easy to assemble at low cost.SOLUTION: A hot water storage type water heater 1 comprises a hot water storage tank 10, an outer case 111 for storing the hot water storage tank 10, and a plurality of functional parts arranged between the outer surface of the hot water storage tank 10 and the inner surface of the outer case 111. The plurality of functional parts comprises submerged functional parts that do not interfere with the function even when submerged, and non-submerged functional parts that interferes with the function when submerged. In a range from the bottom of the outer case 111 to a predetermined height H, the submerged functional parts are arranged without the submerged functional parts. All non-submerged functional parts are arranged at a height equal to or higher than the specified height H.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a hot water storage type water heater and its installation method.

A hot water storage type water heater that stores hot water heated by a heating means such as a heat pump in a hot water storage tank and uses the hot water taken out from the hot water storage tank to supply hot water to a hot water supply destination such as a bathtub, shower, kitchen or washroom faucet is widely used. Has been done.

Patent Document 1 discloses a technique that enables reuse even when the water heater is submerged. The device of Patent Document 1 includes a water heater, a waterproof case with an opening at the bottom, a water detector at the lower part of the waterproof case to detect invading water, and an exhaust flow at the lower part of the exhaust stack. It is equipped with a blocker that stops the combustion and a controller that stops the combustion of the burner by receiving the signal of the water detector that detects water in the waterproof case and sends a control signal to the blocker to block the exhaust stack.

Japanese Unexamined Patent Publication No. 5-248625

It is difficult to apply the technique of Patent Document 1 to a hot water storage type water heater for the following reasons. Since it is necessary to make the outer case for storing the hot water storage tank a closed structure, it is not possible to adopt a fastening means using screws or the like for the outer case. As a method of manufacturing the outer case, assembly by welding the four peripheral surfaces and the upper surface panel, molding by drawing, or a structure in which packing or the like is sandwiched at the seam is adopted. In the case of welding, in order to suppress a decrease in corrosion resistance, there is an increase in cost due to painting both sides after welding. Further, in the case of drawing, since the shape is deep drawing, the dimensions of the outer case in the height direction are limited. In the case of a structure that sandwiches the packing, a packing fee etc. will be added. Further, at the time of assembly, a structure for fastening the outer case itself and the parts inside the outer case is required, but there is a problem that the fastening work between the inner parts and the outer case having a sealed structure becomes very difficult.

The present disclosure has been made to solve the above-mentioned problems, and provides a hot water storage type water heater which can reduce the possibility of failure due to flooding at the time of flooding, is inexpensive, and is easy to assemble, and an installation method thereof. The purpose is to do.

The hot water storage type water heater according to the present disclosure includes a plurality of hot water storage tanks, an outer case for storing the hot water storage tank, and a plurality of functional parts arranged between the outer surface of the hot water storage tank and the inner surface of the outer case. The functional parts include submerged functional parts that do not interfere with the function even if submerged, and non-submerged functional parts that interfere with the function when submerged, and cannot be submerged in the range from the bottom of the outer case to a predetermined height. The functional parts that can be submerged are arranged without the functional parts, and all the functional parts that cannot be submerged are arranged at a height equal to or higher than a predetermined height.
The installation method according to the present disclosure is an installation method for installing the above-mentioned hot water storage type water heater. The hot water storage type water heater includes a water heating device arranged outside the outer case, and the position of the lowermost surface of the water heating device is located. , The water heater is installed so that the height of the installed outer case is higher than the predetermined height.

According to the present disclosure, it is possible to reduce the possibility of failure due to flooding at the time of flood damage, and to provide a hot water storage type water heater which is inexpensive and easy to assemble and an installation method thereof.

It is a side view which shows the hot water storage type water heater by Embodiment 1. FIG. It is a figure which shows the structure of the water circuit of the hot water storage type water heater shown in FIG. It is a side view which shows the hot water storage type water heater of a comparative example.

Hereinafter, embodiments will be described with reference to the drawings. The same reference numerals are given to common or corresponding elements in each figure to simplify or omit the description. In the following description, the description of "water" means, in principle, liquid water, and may include low-temperature water to high-temperature hot water.

Embodiment 1.
FIG. 1 is a side view showing a hot water storage type water heater 1 according to the first embodiment. As shown in FIG. 1, the hot water storage type water heater 1 includes a hot water storage unit 2 and a heat pump unit 3 for heating water. The heat pump unit 3 corresponds to a water heating device provided separately from the hot water storage unit 2. The hot water storage unit 2 includes a hot water storage tank 10 for storing hot water, an outer case 111 for storing the hot water storage tank 10, and a plurality of functional parts arranged between the outer surface of the hot water storage tank 10 and the inner surface of the outer case 111. .. The hot water storage tank 10 is covered with a heat insulating material (not shown).

The outer case 111 in the present embodiment has a rectangular parallelepiped outer shape. The outer case 111 includes a back panel 111a, a side panel 111b, a front panel 111c, a riser 111d, a front lower panel 111e, a top panel 111f, and a bottom panel 111g. FIG. 1 is a perspective view of the inside of the outer case 111 through the front side panel 111b. The front panel 111c forms a portion above the riser 111d in the front surface of the outer case 111. The front lower panel 111e forms a portion of the front surface of the outer case 111 below the riser 111d.

The outer case 111 may be configured by fastening the plurality of panels described above to each other by means of fastening means such as screws. The outer case 111 does not have a closed structure. In the present embodiment, since the outer case 111 does not have a closed structure, welding or deep drawing is not required in the manufacturing process, and the cost of the outer case 111 itself can be suppressed. Further, since the work of mounting the parts in the outer case 111 is easy, the work of assembling the hot water storage unit 2 becomes simple. Therefore, it is possible to provide an inexpensive hot water storage type water heater 1.

The hot water storage unit 2 is installed on the foundation G by a plurality of external legs 4 attached under the bottom panel 111 g. The outer leg 4 may be fixed to the foundation G by anchor bolts. The hot water storage tank 10 is supported by a plurality of internal legs 5 arranged on the bottom panel 111 g. The hot water storage tank 10 has a cylindrical outer shape. When the hot water storage unit 2 is installed, the central axis of the hot water storage tank 10 becomes parallel to the vertical line.

A gantry 401 on which the heat pump unit 3 is mounted is installed on the foundation G. The gantry 401 may be fixed to the foundation G by anchor bolts. The heat pump unit 3 is fixed on the gantry 401.

The external pipe 6 and the external pipe 7 connect between the hot water storage unit 2 and the heat pump unit 3. Low temperature water is sent from the hot water storage unit 2 to the heat pump unit 3 through the external pipe 6. The high-temperature water heated by the heat pump unit 3 returns to the hot water storage unit 2 through the external pipe 7.

If the surroundings of the hot water storage unit 2 are flooded at the time of flood damage, water invades the outer case 111. The plurality of functional parts arranged in the outer case 111 are divided into submersible functional parts that do not hinder their functions even when submerged and non-submerged functional parts that hinder their functions when submerged. A submerged functional component is a component that can be used without impairing its function after being submerged even if it is submerged due to flooding. A non-submerged functional component is a component that, once submerged due to flooding, impairs its function and becomes difficult to use after the water has drained. Non-submersible functional components include, for example, control boards, actuators, sensors, and other electrical components that are not waterproof to cope with submersion.

All the non-submerged functional parts in the outer case 111 are arranged at a height of a predetermined height H or more from the bottom of the outer case 111. In the present embodiment, the lower surface of the bottom panel 111g corresponds to the lowermost part of the outer case 111. In the range from the lowermost part of the outer case 111 to the predetermined height H, no submerged functional parts are arranged, and only submerged functional parts are arranged. The predetermined height H corresponds to the allowable submersion height of the hot water storage type water heater 1. That is, even if the hot water storage unit 2 is submerged to a position of a predetermined height H due to flooding at the time of flood damage, none of the non-submerged functional parts is submerged in water, and the non-submerged functional parts do not break down. Later, the hot water storage type water heater 1 can be used again.

The position of the predetermined height H is higher than the position of the lower end 10a of the hot water storage tank 10. The position of the predetermined height H is a position higher than the position of the riser portion 111d. The value of the predetermined height H is preferably a value of 1 m or 1 m or more. For example, a predetermined height H = 1.3 m may be used. By setting the predetermined height H to such a value, it is possible to more reliably reduce the possibility that the hot water storage type water heater 1 will break down due to flooding at the time of flood damage.

In the following description, all the non-submerged functional parts in the outer case 111 are collectively referred to as "non-submerged functional parts group 20". In the present embodiment, the storage container 30 for storing the non-submerged functional parts group 20 is arranged in the outer case 111. The storage container 30 is arranged above the hot water storage tank 10. That is, the storage container 30 is located between the upper end 10b of the hot water storage tank 10 and the lower surface of the top panel 111f.

As described above, in the present embodiment, the submersible functional parts group 20 is arranged at a height higher than the upper end 10b of the hot water storage tank 10. As a result, the allowable submersion height of the hot water storage type water heater 1 can be sufficiently increased, so that the possibility that the hot water storage type water heater 1 will break down due to flooding at the time of flooding can be more reliably reduced.

A plurality of sockets 301 are provided in the riser portion 111d. The submerged non-submerged functional component group 20 and the plurality of sockets 301 are connected by an internal pipe group 110 composed of a plurality of internal pipes arranged in the outer case 111. The internal piping group 110 corresponds to a submerged functional component. One end of the external pipe 6 and one end of the external pipe 7 are connected to the corresponding socket 301, respectively. An external pipe for supplying hot water to a hot water supply destination such as an indoor faucet or a bath tub, an external pipe for supplying water from a water source, and the like are further connected to another socket 301, but the illustration is omitted.

In the installation method of the hot water storage type water heater 1 of the present embodiment, the heat pump unit is installed so that the position of the lowermost surface 3a of the heat pump unit 3 is equal to or higher than the predetermined height H of the outer case 111 installed on the foundation G. 3 is installed. As a result, even if water is flooded to a position of a predetermined height H in the event of a flood, the parts inside the heat pump unit 3 will not be submerged in water and the heat pump unit 3 will not break down. It will be available again.

The position of the lowermost surface 3a may be the position of the lower surface of the outer housing of the heat pump unit 3. The position of the lowermost surface 3a may be arranged at the same height as the bottom of the storage container 30, for example. In the illustrated example, the heat pump unit 3 is mounted on the gantry 401, but the installation method of the present disclosure is not limited to the method using the gantry 401. For example, instead of the gantry 401, the heat pump unit 3 may be installed so that the position of the heat pump unit 3 in the vertical direction satisfies the above condition by using a terrain or a building.

The storage container 30 has a bottom and a side portion of a watertight structure. Therefore, even if the water level in the outer case 111 rises to the position of the side surface of the storage container 30 at the time of flooding, water does not enter the storage container 30 and the submersible functional parts group 20 does not get wet with water. In the present embodiment, by providing such a storage container 30, it is possible to further reduce the possibility that the hot water storage type water heater 1 will break down due to flooding at the time of flood damage.

The upper part of the storage container 30 may have an open structure. That is, the storage container 30 may have an upper surface opening. In this case, since the functional parts group 20 that cannot be submerged in water can be put into the storage container 30 from the opening on the upper surface, the assembly work becomes easy.

The upper part of the storage container 30 may have a watertight structure. That is, the storage container 30 may have a waterproof property so that water does not enter the storage container 30 even if the entire storage container 30 is submerged. In this case, the possibility that the hot water storage type water heater 1 will break down due to flooding at the time of flood damage can be further reduced. Since the storage container 30 is smaller in size than the outer case 111, it is relatively easy to make it a watertight structure.

The bottom of the storage container 30 may be provided with a drainage structure for draining water from the inside of the storage container 30. This drainage structure may have a check valve whose forward direction is from the inside to the outside of the storage container 30. By providing the drainage structure, the condensed water generated in the storage container 30 can be discharged to the outside of the storage container 30. The inner surface of the bottom of the storage container 30 may be an inclined surface that descends toward the lowest portion of the inner surface. The drainage structure may be provided at the lowest portion. By doing so, the condensed water collected at the bottom of the storage container 30 can be collected in the drainage structure by the inclined surface and smoothly discharged to the outside.

The functional parts group 20 that cannot be submerged may be arranged without providing the storage container 30. Even if the storage container 30 is not provided, if the inundation water level at the time of flood damage is equal to or lower than the position of the predetermined height H, the hot water storage type water heater 1 can be used again after the water is drained.

FIG. 2 is a diagram showing a configuration of a water circuit of the hot water storage type water heater 1 shown in FIG. The positional relationship of each component in FIG. 2 is different from the actual positional relationship in the three-dimensional space.

As shown in FIG. 2, the hot water storage type water heater 1 of the present embodiment has a hot water outlet switching valve 101, a first circulation pump 102, a water inlet switching valve 103, a mixing valve 104, and a heat exchanger as a group of functional parts 20 that cannot be submerged in water. It includes 105, a water level sensor 106, a flow switch 107, a second circulation pump 108, a pressure reducing valve 109, and a control board 201. Of these, the parts other than the heat exchanger 105 and the pressure reducing valve 109 are all electrical parts. Each electric component other than the control board 201 is electrically connected to the control board 201.

The hot water outlet switching valve 101 switches the destination of the hot water returned from the heat pump unit 3 to the hot water storage unit 2. The inlet of the hot water switching valve 101 communicates with the external pipe 7 via the internal pipe 40 and the socket 301. The first circulation pump 102 circulates the water in the water circuit. For example, the first circulation pump 102 sends the water in the hot water storage tank 10 to the heat pump unit 3. The discharge port of the first circulation pump 102 communicates with the external pipe 6 via the internal pipe 41 and the socket 301. The water inlet switching valve 103 switches between a flow path form in which water from the hot water storage tank 10 flows into the first circulation pump 102 and a flow path form in which water from the heat exchanger 105 flows into the first circulation pump 102. The hot water supply pipe 43 connects the outlet of the mixing valve 104 to the socket 301. The water supply pipe 44 connects the water side inlet of the mixing valve 104 to the socket 301. The mixing valve 104 mixes the high-temperature water from the hot water storage tank 10 with the low-temperature water supplied from the water source through the water supply pipe 44, and causes the temperature-adjusted hot water to flow into the hot water supply pipe 43. The heat exchanger 105 warms the bath water by exchanging heat between the bath water from the bathtub and the high temperature water supplied from the hot water storage tank 10. The bath water pipe 45 connects the bath water inlet of the heat exchanger 105 to the socket 301. The bath water pipe 46 connects the bath water outlet of the heat exchanger 105 to the socket 301. The bath water pipe 45 and the bath water pipe 46 are connected to an external pipe connected to the bathtub via the socket 301 to form a bath water circuit in which bath water circulates. The water level sensor 106 provided in the bath water pipe 45 detects the water level in the bathtub. The flow switch 107 provided in the bath water pipe 45 determines the presence or absence of hot water in the bathtub by detecting the presence or absence of the flow of bath water. The second circulation pump 108 provided in the bath water pipe 45 circulates the bath water in the bath water circuit. The pressure reducing valve 109 provided in the water supply pipe 44 protects the hot water storage tank 10 by reducing the water pressure from the water source. In the present embodiment, the internal pipe 40, the internal pipe 41, the hot water supply pipe 43, the water supply pipe 44, the bath water pipe 45, and the bath water pipe 46 correspond to the internal pipe group 110 in FIG.

A plurality of temperature detection devices 120 are arranged on the surface of the hot water storage tank 10. These temperature detection devices 120 are arranged at intervals from each other along the vertical direction. By detecting the hot water storage temperature distribution with these temperature detection devices 120, the amount of residual hot water and the amount of heat storage in the hot water storage tank 10 can be detected. The temperature detection device 120 has a watertight structure specification so that an abnormality such as a short circuit does not occur even if it is submerged in water. That is, the temperature detection device 120 corresponds to a submerged functional component. By making the temperature detection device 120 a submergeable functional component, even if the hot water storage tank 10 is submerged in the event of a flood, the hot water storage type water heater 1 can be used again after the water is drained.

FIG. 3 is a side view showing a hot water storage type water heater 100 of a comparative example. As shown in FIG. 3, in the hot water storage type water heater 100 of the comparative example, the submersible functional parts group 20 is arranged in the space between the front panel 111c and the hot water storage tank 10. Further, the heat pump unit 3 is placed directly on the foundation G. In the hot water storage type water heater 100, it is difficult to prevent the functional parts group 20 and the heat pump unit 3 that cannot be submerged from being submerged in the event of flooding, so that it is difficult to reuse the water heater 100 after the water has been drained.

1 Hot water storage type water supply machine, 2 Hot water storage unit, 3 Heat pump unit, 3a Bottom surface, 4 External legs, 5 Internal legs, 6 External piping, 7 External piping, 10 Hot water storage tank, 10a Lower end, 10b Upper end, 20 Non-submersible functional parts group , 30 Storage container, 40 Internal piping, 41 Internal piping, 43 Hot water supply piping, 44 Water supply piping, 45 Bath water piping, 46 Bath water piping, 100 Hot water storage type water supply machine, 101 Hot water supply switching valve, 102 First circulation pump, 103 Water inlet Switching valve, 104 mixing valve, 105 heat exchanger, 106 water level sensor, 107 flow switch, 108 second circulation pump, 109 pressure reducing valve, 110 internal piping group, 111 outer case, 111a rear panel, 111b side panel, 111c front panel , 111d riser, 111e front lower panel, 111f top panel, 111g bottom panel, 120 temperature detector, 201 control board, 301 socket, 401 pedestal

Claims (10)

Hot water storage tank and
An outer case for storing the hot water storage tank and
A plurality of functional parts arranged between the outer surface of the hot water storage tank and the inner surface of the outer case,
With
The plurality of functional parts include a submerged functional part that does not hinder its function even when submerged, and a non-submerged functional part that hinders its function when submerged.
In the range from the bottom of the outer case to a predetermined height, the submerged functional component is arranged without the submerged functional component.
A hot water storage type water heater in which all the non-submersible functional parts are arranged at a height equal to or higher than the predetermined height. The hot water storage type water heater according to claim 1, wherein the predetermined height is an allowable height for submersion of the hot water storage type water heater. A container for storing the non-submersible functional parts is arranged in the outer case.
The hot water storage type water heater according to claim 1 or 2, wherein the container has a bottom and side portions of a watertight structure and an upper part of a watertight structure or an open structure. The hot water storage type water heater according to claim 3, wherein a drainage structure for draining water from the inside of the container is provided at the bottom of the container. The hot water storage type water heater according to claim 3 or 4, wherein the inner surface of the bottom portion of the container is an inclined surface that descends toward the lowest portion of the inner surface. The hot water storage type water heater according to claim 5, wherein a drainage structure for draining water from the inside of the container is provided at the lowest portion. The hot water storage type water heater according to claim 4 or 6, wherein the drainage structure has a check valve whose forward direction is from the inside to the outside of the container. The hot water storage type water heater according to any one of claims 1 to 7, wherein all the non-submersible functional parts are arranged at a height above the upper end of the hot water storage tank. The hot water storage type water heater according to any one of claims 1 to 8, further comprising a temperature detecting device arranged on the surface of the hot water storage tank as the submerged functional component. The installation method for installing the hot water storage type water heater according to any one of claims 1 to 9.
The hot water storage type water heater includes a water heating device arranged outside the outer case.
An installation method in which the water heating device is installed so that the position of the lowermost surface of the water heating device is equal to or higher than the predetermined height of the installed outer case.

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