Hot water generating device

Abstract

A hot water generating device (1) comprises a heat source unit (2) and a tank (3). The heat source unit (2) constitutes a refrigerant circuit (20) through which a refrigerant circulates. The heat source unit (2) has a compressor (21), a first substrate (51), a water pump (25), and a second substrate (52). The first substrate (51) controls the compressor (21). The water pump (25) causes water to circulate between the heat source unit (2) and the tank (3). The second substrate (52) controls the water pump (25). The second substrate (52) is disposed at a position overlapping the first substrate (51) in the vertical direction.

Description

Hot water generating device

[0001] It relates to a hot water generating device.

[0002] There has been conventionally known a hot water supply device in which a control board for a refrigerant circuit and a control board for a hot water supply circuit are horizontally arranged in a heat source unit (Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-212025)).

[0003] The machine room of the heat source unit has limited space, and when the control board for the refrigerant circuit and the control board for the hot water supply circuit are horizontally arranged in the heat source unit, there is a problem that the heat source unit becomes large-sized.

[0004] The hot water generating device of the first aspect includes a heat source unit and a tank. The heat source unit constitutes a refrigerant circuit in which a refrigerant circulates. The heat source unit has a compressor, a first board, a water pump, and a second board. The first board controls the compressor. The water pump circulates water between the heat source unit and the tank. The second board controls the water pump. The second board is arranged at a position overlapping the first board in the vertical direction.

[0005] In this hot water generating device, the planar space in the heat source unit can be suppressed.

[0006] The hot water generating device of the second aspect is the device of the first aspect, wherein the heat source unit has a casing and a partition plate. The partition plate extends in the vertical direction so as to partition the inside of the casing into a machine room and a blower room. In a front view of the heat source unit, the first board is larger in the left-right direction than the second board. The first board is arranged on the partition plate straddling the machine room and the blower room. The second board is arranged below the first board in the machine room.

[0007] In this hot water generating device, by arranging the first board on the partition plate, the vertical space in the machine room can be suppressed.

[0008] The hot water generating device of the third aspect is the device of the second aspect, wherein the second board is arranged removably from the front direction in the machine room.

[0009] In this hot water generating device, the second circuit board can be easily removed even when the first and second circuit boards are arranged vertically.

[0010] The hot water generating device in the fourth view is a device according to the first, second, or third view, and the heat source unit has a support part, a first plate member, and a second plate member. The support part supports the second substrate. The first plate member is positioned below the second substrate. The second plate member is a metal positioned below the first plate member. The support part has a fastening part formed at a position that overlaps the first plate member in the vertical direction. The first plate member has an opening formed at a position that overlaps the second plate member in the vertical direction. The fastening part is fixed to the opening.

[0011] In this hot water generator, even if the circuit board catches fire, all the ignition is absorbed by the second plate component, making it safe.

[0012] The hot water generating device of the fifth perspective is a device of the first, second, or fourth perspective, and has a connection port on the underside of the first substrate to which a noise suppression component, an electrolytic capacitor, and a compressor harness are connected. At least one of the noise suppression component, electrolytic capacitor, and connection port is positioned so as not to overlap with the second substrate when viewed from above the heat source unit.

[0013] In this hot water generator, even if connection ports to which noise suppression components, electrolytic capacitors, and compressor harnesses are connected are mounted on the first circuit board, the second circuit board can be positioned to overlap the first circuit board vertically.

[0014] The hot water generating device in the sixth perspective is a device according to either the first or fifth perspective, wherein the first substrate has electronic components mounted on its lower surface, and the second substrate has electronic components mounted on its lower surface.

[0015] In this hot water generator, even if condensation occurs on electronic components, the water droplets will drip down, thus preventing the accumulation of condensation on the electronic components.

[0016] The hot water generating device of the seventh aspect is the device of any of the first to sixth aspects, and the heat source unit has a terminal block. The terminal block is located near the first and second substrates.

[0017] In this hot water generator, the connection of electrical wires between the first circuit board, the second circuit board, and the terminal block is easy.

[0018] This is a configuration diagram of a hot water generator according to one embodiment of the present disclosure. This is a functional block diagram of the control unit. This is a perspective view showing the appearance of the heat source unit as seen from the upper right side of the front. This is a front view of the heat source unit with the front panel removed. This is a perspective view of the electrical components box. This is a front view of the electrical components box. This is a view of the electrical components box from below. This is a diagram showing the state in which the support part of the second printed circuit board is fixed. This is a flowchart of the replacement work of the second printed circuit board. This is a configuration diagram of a hot water generator according to a modified example. This is a functional block diagram of the control unit and the tank control unit.

[0019] A hot water generating device 1 according to one embodiment of this disclosure will be described with reference to the drawings.

[0020] (1) Overall configuration diagram 1 is a configuration diagram of a hot water generating device according to one embodiment of the present disclosure.

[0021] The hot water generator 1 comprises a heat source unit 2, a tank 3, and water circulation piping 4. The heat source unit 2 constitutes a refrigerant circuit 20 through which a refrigerant circulates. The water circulation piping 4 is the piping between the heat source unit 2 and the tank 3. Furthermore, the hot water generator 1 constitutes a water circulation circuit 30 in which the heat source unit 2 and the tank 3 are connected in a ring shape by the water circulation piping 4.

[0022] (2) Detailed Configuration (2-1) Heat Source Unit The heat source unit 2 includes a refrigerant circuit 20 through which carbon dioxide refrigerant circulates, a compressor 21, and a control unit 5. The heat source unit 2 also includes a water pump 25 and water piping 28. The water piping 28 connects the water pump 25 to the upstream end of the water pipe 32w in the water heat exchanger 22.

[0023] The refrigerant circuit 20 includes a compressor 21, an expansion valve 23, an air heat exchanger 24, a refrigerant pipe 22r within a water heat exchanger 22, and refrigerant piping 26.

[0024] The refrigerant piping 26 connects each component in the following order: the discharge side of the compressor 21, the refrigerant pipe 22r inside the water heat exchanger 22, the expansion valve 23, the air heat exchanger 24, and the suction side of the compressor 21, circulating the refrigerant within it.

[0025] The water heat exchanger 22 has a refrigerant pipe 22r and a water pipe 32w. The water heat exchanger 22 causes heat exchange to occur between the high-temperature refrigerant flowing through the refrigerant pipe 22r after being discharged by the compressor 21 of the heat source unit 2 and the water flowing through the water pipe 32w. Through this heat exchange in the water heat exchanger 22, the refrigerant passing through the refrigerant pipe 22r is cooled, and at the same time the water passing through the water pipe 32w is heated, thereby producing hot water.

[0026] The water circulation circuit 30 includes a tank 3, a 32W unit in a water heat exchanger 22, a water pump 25, water piping 28, and piping 4.

[0027] Figure 2 is a functional block diagram of the hot water generator 1. The control unit 5 mainly consists of a first printed circuit board (first board) 51 and a second printed circuit board (second board) 52. The first printed circuit board 51 and the second printed circuit board 52 typically consist of a microcomputer equipped with a control arithmetic unit and a memory device, and input / output circuits. The control arithmetic unit is a processor such as a CPU or GPU. The control arithmetic unit reads a control program stored in the memory device and controls the operation of the hot water generator 1 according to the control program. The control arithmetic unit can write calculation results to the memory device and read information stored in the memory device according to the control program.

[0028] The control unit 5 exchanges control signals and the like with the hot water volume and temperature sensor 36. As shown in Figure 2, the control unit 5 controls the compressor 21, expansion valve 23, water pump 25, etc., based on the signals from the hot water volume and temperature sensor 36.

[0029] (2-1-1) External view 3 of the heat source unit is a perspective view showing the external appearance of the heat source unit 2 as seen from the upper right side of the front. In the following description, unless otherwise specified, terms indicating directions or surfaces such as front, back, top, bottom, right, left, etc., refer to the direction or surface when the front plate 29a side of the heat source unit 2 is considered the front.

[0030] The heat source unit 2 comprises a casing 29 and a cover portion 60.

[0031] The casing 29 comprises a front panel 29a, a top panel 29b, a right side panel 29c, a left side panel 29d, and a bottom panel 29e. A grille 29g covering the air inlet / outlet 29f is attached to the front panel 29a of the casing 29.

[0032] The cover portion 60 is a resin housing. The cover portion 60 is located on the outside of the side plate of the casing 29. In this embodiment, the cover portion 60 is located on the outside of the right side plate 29c of the casing 29. The water pump 25 is located inside the cover portion 60. The arrangement of the water pump 25 is not limited to this.

[0033] (2-1-2) Diagram 4 of the internal space of the heat source unit is a front view of the heat source unit with the front panel removed. The internal space of the heat source unit 2 mainly contains a partition plate 29h, a fan 26, an air heat exchanger 24, a compressor 21, an electrical component box 50, and a terminal block unit 58.

[0034] The partition plate 29h extends vertically to divide the inside of the casing 29 into a machine room S1 and a blower room S2. The machine room S1 is the space enclosed by the partition plate 29h, the right side plate 29c, and a portion of the right side of the front plate 29a. The remaining space inside the heat source unit 2 is the blower room S2, through which air taken in from outside the heat source unit 2 is discharged to the outside via the air heat exchanger 24.

[0035] Fan 26 is a propeller fan with multiple blades and is located in the blower room S2. Fan 26 is located in front of the air heat exchanger 24, i.e., downstream, in the blower room S2, and is located behind the front plate 29a. In a front view, fan 26 is located approximately in the center of the blower room S2 and is located to the left of the partition plate 29h. Fan 26 is fixed to the rotation axis of the fan motor 26a and is rotated by the fan motor 26a around an axis parallel to the front-rear direction. The airflow generated by fan 26 is taken into the blower room S2 from the rear side of the heat source unit 2, and is discharged to the outside of the heat source unit 2 through the air heat exchanger 24 and the air inlets and outlets 29f of the front plate 29a.

[0036] The air heat exchanger 24 is located in the blower room S2 and performs heat exchange with the air passing through it. The air heat exchanger 24 has a roughly L-shape and has a portion that follows the back of the heat source unit 2 and a portion that bends to the left from the portion that follows the back.

[0037] The compressor 21 is located in the machine room S1 and is fixed to the bottom plate 29e. The compressor 21 is for compressing the refrigerant and is driven by the compressor motor 21a.

[0038] The electrical components box 50 is positioned above the machine room S1 and the blower room S2, attached to the partition plate 29h. The terminal block unit 58 is positioned above the machine room S1, attached to the right side of the electrical components box 50. In other words, the electrical components box 50 is positioned such that the left portion 50L to which the heat sink 90 is attached protrudes into the blower room S2. Also, the electrical components box 50 is positioned such that the right portion 50R to which the terminal block unit 58 is attached protrudes into the machine room S1.

[0039] (2-1-3) Electrical component box 50 Figure 5 is a perspective view of the electrical component box. Figure 6 is a front view of the electrical component box. Figure 7 is a view of the electrical component box from below. For ease of understanding, in Figure 6, the first printed circuit board 51 and the second printed circuit board 52 are shown with thicker dotted lines and are thicker than they actually are.

[0040] The electrical component box 50 has a first printed circuit board 51, a second printed circuit board 52, a support portion 55, a first plate member 81, and a second plate member 82. As shown in FIGS. 5 to 7, a terminal block unit 58 is attached to the electrical component box 50.

[0041] As shown in FIG. 5, a resin cover 53 is disposed on the upper portion of the electrical component box 50. The cover 53 has a rectangular shape when viewed from above. Below the cover 53, a metal partition member 54 is disposed to substantially cover a part of the front surface 50a (see FIG. 4), the right side surface 50b, the left side surface (not shown), and the rear surface 50c of the electrical component box 50. Also, below the cover 53, a first plate member 81 and a second plate member 82 are disposed to substantially cover the bottom surface 50d of the electrical component box 50 (see FIG. 8).

[0042] (2-1-3-1) First Printed Circuit Board The first printed circuit board 51 is disposed such that its plate-like surface is parallel to the top plate 29a and the bottom plate 29e. The first printed circuit board 51 is disposed on the partition plate 29h straddling the machine room S1 and the blower room S2 (see FIG. 4).

[0043] As shown in FIG. 6, in the front view of the heat source unit 2, the length L1 in the left-right direction of the first printed circuit board 51 is larger than the length L2 in the left-right direction of the second printed circuit board 52. In other words, in the front view of the heat source unit 2, the first printed circuit board 51 is larger than the second printed circuit board 52 in the left-right direction.

[0044] As shown in FIG. 7, electronic components 56 are mounted on the lower surface of the first printed circuit board 51. Also, a plurality of electric wires 59 are connected to the lower surface of the first printed circuit board 51. The first printed circuit board 51 mainly controls the compressor 21.

[0045] On the lower surface of the first printed circuit board 51, a connection port 56c to which a reactor 56a, an electrolytic capacitor 56b, and a harness 57 of the compressor 21 are connected is mounted. In the present embodiment, the connection port 56c to which the reactor 56a, the electrolytic capacitor 56b, and the harness 57 of the compressor 21 are connected is arranged at a position that does not overlap with the second printed circuit board 52 in a top view of the heat source unit 2. The reactor 56a constitutes a rectifier circuit such as a motor 21a that drives the compressor 21. When the reactor 56a is mounted on the first printed circuit board 51, the reactor 56a and other electronic components can be connected on the board.

[0046] Further, on the first printed circuit board 51, heat generating components such as an IPM (Intelligent Power Module) are attached to the left side portion 50L of the electrical component box 50 that projects into the blower chamber S2. The IPM is, for example, an electrical component 56 used for power supply to the compressor motor 21a and the fan 26. The IPM, which is a heat generating component, is thermally connected to a heat sink 90 disposed below the first printed circuit board 51 by, for example, a silicone resin. In other words, among the electrical components 56 mounted on the first printed circuit board 51, there are heat generating components that are thermally connected to the heat sink 90 and cooled by the heat sink 90.

[0047] In the present embodiment, most of the first printed circuit board 51 of the hot water generating device 1 is arranged in the machine chamber S1. Therefore, even when the electrical components mounted on the first printed circuit board 51 generate heat, it is possible to suppress a decrease in the function of the outdoor heat exchanger 24 in the blower chamber S2.

[0048] (2-1-3-2) Second Printed Circuit Board The second printed circuit board 52 is arranged such that its plate-like surface is parallel to the top plate 29a and the bottom plate 29e.

[0049] The second printed circuit board 52 is arranged at a position that overlaps with the first printed circuit board 51 in the vertical direction. In the present embodiment, the second printed circuit board 52 is arranged at a position that overlaps with the first printed circuit board 51 when viewed from above.

[0050] The second printed circuit board 52 is positioned in the machine room S1, below the first printed circuit board 51. The area of ​​the second printed circuit board 52 is 0.25 to 0.5 times the area of ​​the first printed circuit board 51.

[0051] As shown in Figure 7, the second printed circuit board 52 has electronic components 56 mounted on its underside. Additionally, multiple wires 59 are connected to the underside of the second printed circuit board 52. The second printed circuit board 52 primarily controls the water pump 25.

[0052] The first printed circuit board 51 and the second printed circuit board 52 are connected by an electric wire 59. The first printed circuit board 51 and the second printed circuit board 52 may also be connected wirelessly. The first printed circuit board 51 and the second printed circuit board 52 communicate with each other.

[0053] If the water pump 25 needs to be replaced, the second printed circuit board 52 may also need to be replaced along with the water pump 25. The second printed circuit board 52 is located in the machine room S1 and is removable from the front.

[0054] Figure 8 shows the state in which the support portion of the second printed circuit board is fixed. The support portion 55 supports the second printed circuit board 52.

[0055] As shown in Figure 8, the first plate member 81 is positioned below the second printed circuit board 52. The second plate member 82 is a metal positioned below the first plate member 81. In this embodiment, the first plate member 81 and the second plate member 82 are sheet metal.

[0056] The support portion 55 has a fastening portion 55a formed at a position that overlaps vertically with the first plate member (first sheet metal) 81. In this embodiment, the fastening portion 55a is a claw. The fastening portion 55a may also be a screw member.

[0057] The first sheet metal 81 has an opening 81a formed in a position that overlaps vertically with the second sheet metal member (second sheet metal) 82. The claw 55a is fixed to the opening 81a. This fixes the support portion 55 to the first sheet metal 81.

[0058] (2-1-4) Terminal Block Unit The terminal block unit 58 is mounted on the right side of the electrical component box 50. As shown in Figure 5, the terminal block unit 58 mainly consists of a terminal block mounting plate 58a and a terminal block 58b. The terminal block mounting plate 53a is positioned opposite the right side of the casing 29. The terminal block mounting plate 58a is located where it is visible from an opening (not shown) in the right side plate 29c which forms the right side of the casing 29.

[0059] A terminal block 58b is attached to the terminal block mounting plate 58a. The terminal block 58b consists of terminal components to which wiring and other connections are made for transmitting data to and from the hot water volume temperature sensor 36.

[0060] The terminal block 58b is positioned near the first printed circuit board 51 and the second printed circuit board 52. A wire 59 is connected between the terminal block 58b and the first printed circuit board 51. Also, a wire 59 is connected between the terminal block 58b and the second printed circuit board 52.

[0061] (2-2) Tank Tank 3 is a device that warms, stores, and utilizes water supplied from an external source such as city water using heat obtained from the heat source unit 2. Tank 3 is a tank that stores hot water obtained from the heat source unit 2 in advance before it is used. Tank 3 is always filled with water and hot water, and a hot water volume and temperature sensor 36 is provided to allow the control unit 5 to know the amount of hot water. Based on the temperature detected by the hot water volume and temperature sensor 36, the control unit 5 drives the heat source unit 2 to perform a boiling operation (heating operation). The boiling operation is an operation in which the amount of heat is increased until the temperature of the water in Tank 3 reaches the target temperature.

[0062] The water circulation piping 4 has a supply pipe 31 and a return pipe 33.

[0063] The supply pipe 31 connects the area near the lower end of the tank 3 to the water pump 25.

[0064] The return pipe 33 connects the downstream end of the water pipe 32w in the water heat exchanger 22 to the vicinity of the upper end of the tank 3.

[0065] The water pump 25 is driven by a command from the control unit 5, causing the cooler water at the bottom of the tank 3 to flow out into the supply pipe 31. The water that flows out into the supply pipe 31 is sent to the water pump 25 of the heat source unit 2 and flows into the water piping 28. The water that flows out of the water piping 28 of the heat source unit 2 passes through the water pipe 32w in the water heat exchanger 22, increasing its temperature, and is returned to the vicinity of the top of the tank 3 via the return pipe 33. As a result, the boundary between the hot water and cold water in the tank 3 moves from top to bottom, and the amount of hot water in the tank 3 increases.

[0066] The water supply pipe 71 receives water from an external source such as city water and supplies room temperature water to the vicinity of the lower end of the tank 3. The hot water supply pipe 73 guides the relatively hot water, which is located near the upper end of the water or hot water stored in the tank 3, to the user's location.

[0067] (3) Replacement of the second printed circuit board Figure 9 is a flowchart of the replacement procedure for the second printed circuit board 52.

[0068] In step S1, the wires 59 are removed from the first printed circuit board 51. In this embodiment, of the wires 59 connected to the lower surface of the first printed circuit board 51, the wires 59 connected to the first printed circuit board 51 on the front side of the heat source unit 2 are removed.

[0069] In step S2, the second printed circuit board 52 is removed. In this embodiment, the claws 55a of the support portion 55 that supports the second printed circuit board 52 are fixed to the opening 81a of the first sheet metal 81. In step S2, the claws 55a are released from the opening 81a and the support portion 55 is pulled out from the front to remove the second printed circuit board 52 from inside the machine room S1. In this embodiment, the second printed circuit board 52 is removed with the electric wires 59 connected to the lower surface of the second printed circuit board 52.

[0070] In step S3, the wire 59 connected to the underside of the second printed circuit board 52 is removed.

[0071] In step S4, the wires 59 removed from the second printed circuit board 52 in step S3 are connected to the underside of the second printed circuit board 52.

[0072] In step S5, the second printed circuit board 52 is installed. In this embodiment, the second printed circuit board 52 is installed in the machine room S1 by moving the support portion 55 that supports the second printed circuit board 52 from the front to the rear. The claws 55a of the support portion 55 are fixed to the opening 81a of the first sheet metal 81. In this embodiment, the second printed circuit board 52 is installed with the electric wires 59 connected to the lower surface of the second printed circuit board 52.

[0073] In step S6, the wires 59 are connected to the first printed circuit board 51. In this embodiment, the wires 59 removed from the first printed circuit board 51 in step S1 are connected to the lower surface of the first printed circuit board 51.

[0074] (4) Features (4-1) The hot water generator 1 according to this embodiment comprises a heat source unit 2 and a tank 3. The heat source unit 2 constitutes a refrigerant circuit 20 through which a refrigerant circulates. The heat source unit 2 includes a compressor 21, a first printed circuit board 51, a water pump 25, and a second printed circuit board 52. The first printed circuit board 51 controls the compressor 21. The water pump 25 circulates water between the heat source unit 2 and the tank 3. The second printed circuit board 52 controls the water pump 25. The second printed circuit board 52 is positioned to overlap the first printed circuit board 51 in the vertical direction.

[0075] Conventionally, in hot water supply systems that have a control board for the refrigerant circuit and a control board for the hot water supply circuit within the heat source unit, the refrigerant circuit control board and the hot water supply circuit control board are arranged horizontally side by side. However, the machine room of the heat source unit has limited space. Therefore, arranging the refrigerant circuit control board and the hot water supply circuit control board horizontally increases the size of the heat source unit.

[0076] In this embodiment, by arranging the first printed circuit board 51 that controls the compressor 21 and the second printed circuit board 52 that controls the water pump 25 in positions that overlap vertically, the size of the heat source unit 2 can be kept from increasing.

[0077] This hot water generator 1 can minimize the planar space within the heat source unit 2.

[0078] (4-2) In the hot water generator 1 according to this embodiment, the heat source unit 2 includes a casing 29 and a partition plate 29h. The partition plate 29h extends vertically so as to divide the inside of the casing 29 into a machine room S1 and a blower room S2. In a front view of the heat source unit 2, the first printed circuit board 51 is larger in the left-right direction than the second circuit board 52. The first printed circuit board 51 is positioned on the partition plate 29h, straddling the machine room S1 and the blower room S2. The second printed circuit board 52 is positioned in the machine room S1, below the first printed circuit board 51.

[0079] In this hot water generator 1, the vertical space required in the machine room S1 can be reduced by placing the first printed circuit board 51 on the partition plate 29h.

[0080] (4-3) In the hot water generating apparatus 1 according to this embodiment, the second printed circuit board 52 is arranged in the machine room S1 so as to be removable from the front.

[0081] In this embodiment, since the second printed circuit board 52 can be removed from the front, the second printed circuit board 51 can be easily replaced.

[0082] In this hot water generator 1, even when the first printed circuit board 51 and the second printed circuit board 52 are arranged in the vertical direction, the second printed circuit board 52 can be easily removed.

[0083] (4-4) In the hot water generating device 1 according to this embodiment, the heat source unit 2 includes a support portion 55, a first sheet metal 81, and a second sheet metal 82. The support portion 55 supports the second printed circuit board 52. The first sheet metal 81 is positioned below the second printed circuit board 52. The second sheet metal 82 is a metal positioned below the first sheet metal 81. The support portion 55 has claws 55a formed at a position that overlaps the first sheet metal 81 in the vertical direction. The first sheet metal 81 has an opening 81a formed at a position that overlaps the second sheet metal 82 in the vertical direction. The claws 55a are fixed to the opening 81a.

[0084] In this hot water generator 1, even if the first printed circuit board 51 or the second printed circuit board 52 ignites, all the ignition is absorbed by the second board member 82, making it safe.

[0085] (4-5) In the hot water generator 1 according to this embodiment, a connection port 56c is mounted on the lower surface of the first printed circuit board 51 to which the reactor 56a, electrolytic capacitor 56b, and harness 57 of the compressor 21 are connected. The connection port 56c to which the reactor 56a, electrolytic capacitor 56b, and harness 57 of the compressor 21 are connected is positioned so as not to overlap with the second printed circuit board 52 when viewed from above of the heat source unit 2.

[0086] In this hot water generator 1, even when the reactor 56a, electrolytic capacitor 56b, and connection port 56c to which the harness 57 of the compressor 21 is connected are mounted on the first printed circuit board 51, the second printed circuit board 52 can be positioned so as to overlap the first printed circuit board 51 in the vertical direction.

[0087] (4-6) In the hot water generator 1 according to this embodiment, the first printed circuit board 51 has electronic components 56 mounted on its lower surface. The second printed circuit board 52 has electronic components 56 mounted on its lower surface.

[0088] When the heat source unit 2 is placed outdoors, for example, condensation may form on the electronic components 56 inside the heat source unit 2 due to fog outside.

[0089] In this hot water generator 1, even if condensation occurs on the electronic component 56, the water droplets will drip down, thus preventing the accumulation of condensation on the electronic component 56.

[0090] (4-7) In the hot water generator 1 according to this embodiment, the heat source unit 2 has a terminal block 58b. The terminal block 58b is located near the first printed circuit board 51 and the second printed circuit board 52.

[0091] In this hot water generator 1, the connection of electrical wires between the first printed circuit board 51, the second printed circuit board 52, and the terminal block 58b is easily facilitated.

[0092] (5) Modified Examples (5-1) Modified Example 1A In this embodiment, the case in which the reactor 56a, electrolytic capacitor 56b, and the harness 57 of the compressor 21 are arranged in a position that does not overlap with the second printed circuit board 52 in a top view of the heat source unit 2 has been described, but the invention is not limited to this. At least one of the connection ports 56 to which the reactor 56a, electrolytic capacitor 56b, and the harness 57 of the compressor 21 are connected may be arranged in a position that does not overlap with the second printed circuit board 52 in a top view of the heat source unit 2.

[0093] (5-2) Modification 1B In this embodiment, the case in which the first printed circuit board 51 mainly controls the compressor 21 and the second printed circuit board 52 mainly controls the water pump 25 has been described, but a third printed circuit board that controls the water pump 25 may be further included.

[0094] Figure 10 is a configuration diagram of the hot water generator 100 according to this modified example. Figure 11 is a functional block diagram of the control unit (heat source control unit) 5 and the tank control unit 35. The hot water generator 100 differs from this embodiment in that it has a tank unit 130. In this modified example, the parts that differ from this embodiment will be explained, and other explanations will be omitted as appropriate unless necessary.

[0095] The tank unit 130 mainly comprises a tank 3 and a tank control unit 35. The tank control unit 35 has a third circuit board 37 that controls the water pump 25.

[0096] In this modified configuration, the first printed circuit board 51 primarily controls the compressor 21. The third printed circuit board 37 primarily controls the water pump 25.

[0097] The second printed circuit board 52 is connected to a converter. The second printed circuit board 52 is a board that communicates with the third printed circuit board 37. The second printed circuit board 52 controls the water pump 25 by communicating with the third printed circuit board 37.

[0098] The first printed circuit board 51, the second printed circuit board 52, and the third printed circuit board 37 are connected by wires. The first printed circuit board 51, the second printed circuit board 52, and the third printed circuit board 37 may also be connected wirelessly. The first printed circuit board 51, the second printed circuit board 52, and the third printed circuit board 37 communicate with each other.

[0099] (5-3) Modification 1C In this embodiment, the case in which the refrigerant is a single refrigerant consisting of carbon dioxide has been described, but a mixed refrigerant containing carbon dioxide may also be used.

[0100] (5-4) Modification 1D In this embodiment, the case in which the cover portion 60 is arranged on the outside of the right side plate 29c of the casing 29 of the heat source unit 2 has been described, but it is not limited to this. The heat source unit 2 may be configured without the cover portion 60.

[0101] (5-5) Although embodiments of the present disclosure have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the present disclosure as described in the claims.

[0102] 1,100 Hot water generator 2 Heat source unit 3 Tank 5 Control unit 20 Refrigerant circuit 21 Compressor 25 Water pump 26 Refrigerant piping 29 Casing 29h Partition plate 50 Electrical component box 51 First printed circuit board (first board) 52 Second printed circuit board (second board) 55 Support part 55a Claw (fastening part) 56 Electronic component 56a Reactor (noise suppression component) 56b Electrolytic capacitor 56c Connection port 57 Compressor harness 81 First sheet metal (first board member) 81a Opening 82 Second sheet metal (second board member) 58b Terminal block S1 Machine room S2 Blower room

[0103] Japanese Patent Publication No. 2007-212025

Claims

1. A hot water generating device (1, 100) comprising a heat source unit (2) and a tank (3) that constitute a refrigerant circuit (20) through which a refrigerant circulates, wherein the heat source unit has a compressor (21), a first circuit board (51) that controls the compressor, a water pump (25) that circulates water between the heat source unit and the tank, and a second circuit board (52) that controls the water pump, and the second circuit board is positioned to overlap the first circuit board in the vertical direction.

2. The hot water generating apparatus according to claim 1, wherein the heat source unit comprises a casing (29) and a partition plate (29h) extending vertically to divide the inside of the casing into a machine room (S1) and a blower room (S2), and in a front view of the heat source unit, the first substrate is larger in the left-right direction than the second substrate, the first substrate is positioned on the partition plate, straddling the machine room and the blower room, and the second substrate is positioned in the machine room, lower than the first substrate.

3. The hot water generating apparatus according to claim 2, wherein the second substrate is detachably arranged in the machine room from the front.

4. The heat source unit comprises a support portion (55) for supporting the second substrate, a first plate member (81) positioned below the second substrate, and a second metal plate member (82) positioned below the first plate member, wherein the support portion has a fastening portion (55a) formed at a position that overlaps the first plate member in the vertical direction, the first plate member has an opening (81a) formed at a position that overlaps the second plate member in the vertical direction, and the fastening portion is fixed to the opening, as described in any one of claims 1 to 3.

5. A connection port (56c) to which a noise suppression component (56a), an electrolytic capacitor (56b), and the harness (57) of the compressor are connected is mounted on the lower surface of the first substrate, and at least one of the noise suppression component, the electrolytic capacitor, and the connection port is positioned so as not to overlap with the second substrate when viewed from above the heat source unit, according to any one of claims 1 to 4.

6. The hot water generating apparatus according to any one of claims 1 to 5, wherein the first substrate has an electronic component (56) mounted on its lower surface, and the second substrate has the electronic component mounted on its lower surface.

7. The hot water generating apparatus according to any one of claims 1 to 6, wherein the heat source unit has a terminal block (58b), and the terminal block is located near the first substrate and the second substrate.

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