Hot water generating device

Abstract

A hot water generating device (1) comprises a heat source unit (2), a tank (3), and piping (4). The heat source unit (2) constitutes a refrigerant circuit (20) through which a refrigerant circulates. The piping (4) is between the heat source unit (2) and the tank (3). The heat source unit (2) has a compressor (21), a casing (29), and a water pump (25). The casing (29) accommodates the compressor (21). The water pump (25) causes water to circulate between the heat source unit (2) and the tank (3). The water pump (25) is disposed outside the casing (29).

Description

Hot water generation device

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

[0002] A water heater with a water pump placed in the machine room of the outdoor unit has been conventionally known (Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2024-108391)).

[0003] Since there are many pipes and component parts in the machine room of the outdoor unit, the space is narrow. When a water pump is placed in the machine room, the inside of the machine room becomes complicated, and there is a problem that maintenance of the water pump becomes difficult.

[0004] The hot water generation device of the first aspect includes a heat source unit, a tank, and a pipe. The heat source unit constitutes a refrigerant circuit in which the refrigerant circulates. The pipe is a pipe between the heat source unit and the tank. The heat source unit has a compressor, a casing, and a water pump. The casing houses the compressor. The water pump circulates water between the heat source unit and the tank. The water pump is arranged outside the side plate of the casing.

[0005] In this hot water generation device, the maintainability of the water pump is improved, and the complexity inside the casing of the heat source unit is eliminated.

[0006] The hot water generation device of the second aspect is the device of the first aspect, wherein the heat source unit has a cover portion. The cover portion is arranged outside the casing. The water pump is arranged inside the cover portion.

[0007] In this hot water generation device, since it has a cover portion outside the side plate of the casing, it is possible to prevent accidental contact with the water pump.

[0008] The hot water generating device in the third aspect is the device in the first or second aspect, wherein the water pump is located outside the side plate, front plate, or rear plate of the casing. The heat source unit includes a heat exchanger, a first water pipe, and a second water pipe. The heat exchanger heats the water flowing in from the tank. The first water pipe is connected to the water pump at one end and to the heat exchanger at the other end. The second water pipe is connected to the heat exchanger at one end and to the piping between the heat source unit and the tank via a fitting at the other end. The water pump is removable from the heat source unit. The first and second water pipes are positioned in a direction different from the direction of removal from the water pump.

[0009] This hot water generator allows for easy removal of the water pump, improving maintainability.

[0010] The hot water generating device in the fourth aspect is the device in the first or second aspect, and the water pump is located on the outside of the side plate of the casing. A sheet metal is fixed to the side plate of the casing between the water pump and the fitting. In the front-to-back direction of the casing, the water pump is provided on the front side of the sheet metal and the fitting is provided on the rear side of the sheet metal. In a front view of the heat source unit, the water pump, sheet metal, and fitting are arranged in that order from front to back.

[0011] In this hot water generator, a sheet metal plate is installed between the water pump and the fitting, so that no extra force is applied to the water pump during the installation and assembly of the hot water generator.

[0012] The hot water generating device in the fifth aspect is the device described in the first to fourth aspects, and the water pump is located outside the side, front, or rear plate of the casing. The power lines for the water pump are connected so as to extend downwards toward the bottom of the water pump.

[0013] In this hot water generator, the power lines for the water pump are connected so that they extend downwards towards the bottom of the water pump, preventing condensation from running down to the water pump motor.

[0014] The hot water generating device in the sixth perspective is any of the devices in the first to fifth perspectives, and the water pump is located outside the side plate, front plate, or rear plate of the casing. In the vertical direction of the heat source unit, the water pump is located above the connection between the heat exchanger and the first water piping and the connection between the heat exchanger and the second water piping.

[0015] In this hot water generating device, the water pump can be easily accessed by positioning it above the connection point between the heat exchanger and the first water pipe, and above the connection point between the heat exchanger and the second water pipe.

[0016] The hot water generating apparatus of the seventh aspect is the apparatus of any of the first to sixth aspects, wherein the water pump is located on the outside of either the side plate, front plate, or rear plate of the casing. The heat source unit has a connector. The connector is located on the upper inside of the casing. The wires of the water pump extend upward along the outside of either the side plate, front plate, or rear plate of the casing and are connected to the connector.

[0017] In this hot water generator, the water pump's wiring is positioned on the outside of the casing's side panel, making it easier to remove the water pump.

[0018] This is a diagram showing the configuration of a hot water generator according to one embodiment of the present disclosure. This is a perspective view showing the appearance of the heat source unit as seen from the upper right of the front side. This is a perspective view showing the appearance of the heat source unit as seen from the upper right of the front side with the cover removed. This is a diagram showing the heat source unit with the cover removed. This is a perspective view showing the water piping connected to the water pump. This is a diagram showing the positional relationship between the water pump and the water piping. This is a perspective view of the quick fastener. This is a diagram showing the electrical wires connected to the connector. This is a flowchart of the water pump replacement procedure. This is a diagram showing another example of the positional relationship between the water pump and the water piping. This is a diagram showing another example of the positional relationship between the water pump and the water piping. This is a perspective view showing the appearance of the heat source unit as seen from the upper right of the front side with the cover removed.

[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 (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 has a refrigerant circuit 20 through which carbon dioxide refrigerant is circulated, a casing 29, a water pump 25, and water piping 28.

[0023] The refrigerant circuit 20 includes a compressor 21, an expansion valve 23, an air heat exchanger 24, a refrigerant pipe 22r within the 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 water circulation piping 4.

[0027] The heat source unit 2 also has a connector 56. The connector 56 is located on the upper inside of the casing 29 (see Figure 6).

[0028] (2-1-1) Figure 2 of the heat source unit is a perspective view showing the exterior of the heat source unit 2 as seen from the upper right side of the front. Figure 3 is a perspective view showing the exterior of the heat source unit 2 as seen from the upper right side of the front with the cover 60 removed. Figure 4 shows the exterior of the right side plate 29c of the casing 29 as seen with the cover 60 removed. 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.

[0029] The heat source unit 2 comprises a casing 29 and a cover portion 60. The casing 29 includes a front plate 29a, a top plate 29b, a right side plate 29c, a left side plate (not shown), a rear plate 29h, and a bottom plate (not shown). A grill 29d covering the air inlet / outlet 29e is attached to the front plate 29a of the casing 29. The casing 29 houses the compressor 21. In other words, the right side plate 29 of the casing 29 is a sheet metal that forms the machine room (not shown) where the compressor 21 inside the casing 29 is located, and together with the front plate 29a, top plate 29b, left side plate, rear plate 29h, and bottom plate, it forms the casing 29.

[0030] Furthermore, the casing 29 has an opening 29g. In this embodiment, the casing 29 has an opening 29g above the right side plate 29c.

[0031] (2-1-2) Cover portion The cover portion 60 is a resin housing. The cover portion 60 is positioned on the outside of the side plate of the casing 29. In this embodiment, the cover portion 60 is positioned on the outside of the right side plate 29c of the casing 29. The cover portion 60 is not limited to being positioned separately from the right side plate 29c of the casing 29. The cover portion 60 and the right side plate 29c of the casing 20 may be integrally molded.

[0032] The water pump 25 and water piping 28 are arranged inside the cover portion 60. The water pump 25 may or may not be in contact with the cover portion 60.

[0033] The heat source unit 2 has a fastening portion 29f. The fastening portion 29f fastens the cover portion 60 to the outside of the right side plate 29c of the casing 29. In this embodiment, the fastening portion 29f is a claw. The claw 29f is provided on the right side plate 29c of the casing 29. The fastening portion 29f may also be a screw member.

[0034] (2-1-3) Water pump Figure 5 is a perspective view showing the water piping 28 connected to the water pump 25.

[0035] The water pump 25 circulates water between the heat source unit 2 and the tank 3. In this embodiment, as shown in Figure 3, the water pump 25 is positioned outside the right side plate 29c of the casing 29. Positioning outside the right side plate 29c of the casing 29 means positioning outside and near the right side plate 29c of the casing 29. When the water pump 25 is positioned outside the right side plate 29c of the casing 29, it may or may not be in contact with the right side plate 29c of the casing 29. Also, when the water pump 25 is positioned near the right side plate 29c of the casing 29, it is sufficient that the water pump 25 is substantially positioned within the heat source unit 2. For example, the shortest straight-line distance between the right side plate 29c of the casing 29 and the water pump 25 is approximately 20 cm or less.

[0036] The water pump 25 has a suction section 25a and a discharge section 25b. When the water pump 25 is installed, the suction section 25a is facing upwards and the discharge section 25b is facing backwards.

[0037] In this embodiment, the water pump 25 is installed with its suction portion 25a facing upward and its discharge portion 25b facing backward. This allows the water pump 25 to be positioned inside the cover portion 60, outside the right-side plate 29c of the casing 29, even when the internal space of the cover portion 60 is small.

[0038] The water pump 25 requires maintenance or replacement. The water pump 25 is removable from the heat source unit 2. In this embodiment, the water pump 25 is located outside the casing 29, making it easy to remove and replace.

[0039] Between the water pump 25 and the fitting 11, a sheet metal 27 is fixed to the side plate of the casing 29. In this embodiment, the sheet metal 27 is fixed perpendicularly to the right side plate 29c of the casing 29. In the front-to-back direction of the casing 29, the water pump 25 is provided on the front side of the sheet metal 27, and the fitting 11 is provided on the rear side of the sheet metal 27. In a front view of the heat source unit 2, the water pump 25, the sheet metal 27, and the fitting 11 are arranged in that order from front to back.

[0040] The joint 11 has a flange portion 11a. The flange portion 11a is fastened to the sheet metal 27 in two places in front of the suction portion 25a of the water pump 25. The water pump 25 is installed on the front side of the sheet metal 27 and the joint 11 is installed on the rear side of the sheet metal 27, so that no extra force is applied from the joint 11 to the water pump 25.

[0041] The water heat exchanger 22 is positioned within the casing 29 of the heat source unit 2 so as to cover the bottom plate (not shown). In the vertical direction of the heat source unit 2, the water pump 25 is positioned above the connection portion 128a between the water heat exchanger 22 and the first water pipe 28a and the connection portion 128b between the water heat exchanger 22 and the second water pipe 28b.

[0042] One end of the electrical wire (pump harness) 25c of the water pump 25 is connected to the water pump 25 so as to extend downward toward the bottom of the water pump 25 (not shown). The other end of the electrical wire 25c of the water pump 25 extends upward along the outside of the right side plate 29c of the casing 29 and is connected to the connector 56.

[0043] (2-1-4) Water piping The water piping 28 has a first water piping 28a and a second water piping 28b. In this embodiment, the outer diameter of the first water piping 28a and the second water piping 28b is 12.7 mm. The length of the first water piping 28a is, for example, 560 to 580 mm. The length of the second water piping 28a is, for example, 460 to 480 mm. The dimensions of the first water piping 28a and the second water piping 28b are not limited to these.

[0044] FIG. 6 is a diagram showing the positional relationship between the water pump and the water pipes. The first water pipe 28a and the second water pipe 28b are arranged at positions in a direction different from the extraction direction of the water pump 25. In the present embodiment, the extraction direction of the water pump 25 is the forward direction (front direction). As shown in FIG. 6, the first water pipe 28a and the second water pipe 28b are arranged at positions different from the forward direction, which is the extraction direction of the water pump 25 in the installed state, for example, on the right side or the upper side.

[0045] The first water pipe 28a has a first portion 101, a second portion 102, a third portion 103, a fourth portion 104, a fifth portion 105, and a bent portion 106.

[0046] As shown in FIG. 5, the first portion 101 extends along the first direction (the vertical direction in the installed state). In the installed state, the water flowing from the tank 3 to the heat source unit 2 flows upward along the first portion 101.

[0047] The second portion 102 extends along a second direction (the horizontal direction in the installed state) that intersects the first direction. In the installed state, the water flowing from the tank 3 to the heat source unit 2 flows rightward along the second portion 102.

[0048] The third portion 103 is located on the right side of the first portion 101 in the installed state and extends along the first direction. In the installed state, the water flowing from the tank 3 to the heat source unit 2 flows downward along the third portion 103.

[0049] The fourth portion 104 is located below the second portion 102 in the installed state and extends along the second direction. In the installed state, the water flowing from the tank 3 to the heat source unit 2 flows rearward along the fourth portion 104.

[0050] The fifth portion 105 is located on the right side of the first portion 101 and rearward of the third portion 103 in the installed state and extends along the first direction. In the installed state, the water flowing from the tank 3 to the heat source unit 2 flows downward along the fifth portion 105.

[0051] The bent portion 106 is the part that connects the fifth portion 105 and the water heat exchanger 22. In the installed state, the water flowing from the tank 3 to the heat source unit 2 changes direction at the bent portion 106, flowing from downward to forward.

[0052] In this embodiment, the first water pipe 28a is connected in the following order when installed: first section 101, second section 102, third section 103, fourth section 104, fifth section 105, and bent section 106. As a result, the first water pipe 28a is connected alternately to the section extending in the first direction (vertical direction in the installed state) and the section extending in the second direction (horizontal direction in the installed state). Therefore, even if the space inside the cover 60 is small, the first water pipe 28a can be placed inside the cover section 60.

[0053] The first water pipe 28a is connected to the water pump 25 at one end and to the water heat exchanger 22 at the other end. In other words, the first water pipe 28a has its first section 101 connected to the discharge section 25b of the water pump 25, and its bent section 106 connected to the upstream end of the water pipe 32w inside the water heat exchanger 22.

[0054] Figure 7 shows an external perspective view of the quick fastener 80. The quick fastener 80 is a plate-shaped metal member with a roughly U-shape when viewed from above. The quick fastener 80 has a first clamping portion 81, a second clamping portion 82, a first arc portion 83, a second arc portion 84, a first guide 85, a second guide 86, a first opening 87, a second opening 88, and a surrounding portion 79. The quick fastener 80 has a roughly U-shape when viewed from above, with a portion of it forming an arc shape. In this embodiment, the connection point between the first portion 101 of the first water pipe 28a and the discharge portion 25b of the water pump 25 is clamped by the quick fastener 80 (not shown).

[0055] In this embodiment, the first water pipe 28a has been described as having a first portion 101, a second portion 102, a third portion 103, a fourth portion 104, a fifth portion 105, and a bent portion 106, but it is not limited to this.

[0056] Furthermore, the second water pipe 28b has a first portion 201, a second portion 202, a third portion 203, a fourth portion 204, and a bent portion 205.

[0057] As shown in Figure 5, the bent portion 205 is the part that connects the first portion 201 and the water heat exchanger 22. In the installed state, the water flowing from the heat source unit 2 to the tank 3 changes direction at the bent portion 205, flowing from the front to the upward direction.

[0058] The first section 201 extends along the first direction. In the installed state, the water flowing from the heat source unit 2 to the tank 3 flows upward in the first section 201.

[0059] The second section 202 extends along the second direction. In the installed state, the water flowing from the heat source unit 2 to the tank 3 flows along the forward direction in the second section 202.

[0060] The third section 203 is located above the first section 201 in the installed state and extends along the first direction. In the installed state, the water flowing from the heat source unit 2 to the tank 3 flows upward in the third section 203.

[0061] The fourth section 204 is located above the second section 202 in the installed state and extends along the second direction. In the installed state, the water flowing from the heat source unit 2 to the tank 3 flows along the rearward direction in the fourth section 204.

[0062] The second water pipe 28b is connected at one end to the water heat exchanger 22, and at the other end to the water circulation pipe 4 between the heat source unit 2 and the tank 3 via a joint 11. In other words, the second water pipe 28b has a bent portion 205 that connects to the downstream end of the water pipe 32w inside the water heat exchanger 22, and a fourth portion 204 that connects to the return pipe 33 via a joint 11.

[0063] In this embodiment, the second water pipe 28b has been described as having a first portion 201, a second portion 202, a third portion 203, a fourth portion 204, and a bent portion 205, but it is not limited to this.

[0064] In this embodiment, the second water pipe 28b is connected in the following order when installed: the bent portion 205, the first portion 201, the second portion 202, the third portion 203, the fourth portion 204, and the fifth portion 105. As a result, the portion of the second water pipe 28b extending in the first direction (vertical direction in the installed state) and the portion extending in the second direction (horizontal direction in the installed state) are connected alternately, so that the second water pipe 28b can be placed inside the cover portion 60 even when the space inside the cover 60 is small.

[0065] (2-1-5) Control Unit The control unit 5 mainly consists of a control board (not shown) for the heat source unit 2 and an operation unit 50.

[0066] The control board typically consists of a microcomputer equipped with a control calculation unit and a memory device, and input / output circuits. The control calculation unit is a processor such as a CPU or GPU. The control calculation unit reads the control program stored in the memory device and controls the operation of the hot water generator 1 according to the control program. The control calculation unit can write calculation results to the memory device and read information stored in the memory device according to the control program. The control board exchanges control signals and the like with the hot water volume and temperature sensor 36.

[0067] (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 detection 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.

[0068] The water circulation piping 4 has a supply pipe 31 and a return pipe 33.

[0069] The supply pipe 31 connects the area near the lower end of the tank 3 to the water pump 25.

[0070] 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.

[0071] 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 then sent back to the water pump 25. The water discharged from the water pump 25 flows into the first water pipe 28a of the heat source unit 2. The water that flows into the first water pipe 28a of the heat source unit 2 passes through the water pipe 32w in the water heat exchanger 22, increasing its temperature, and is then returned to the vicinity of the top of the tank 3 via the second water pipe 28b and 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.

[0072] 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.

[0073] (3) Water pump replacement Figure 9 is a flowchart of the water pump replacement procedure.

[0074] In step S1, the quick fastener 80 is removed. In this embodiment, the cover portion 60 is removed from the casing 29, and then the quick fastener 80, which is clamping the connection point between the first portion 101 of the first water pipe 28a and the discharge portion 25b of the water pump 25, is removed.

[0075] In step S2, the water pipe 28 is removed. In this embodiment, the first portion 101 of the first water pipe 28 is connected to the discharge portion 25b of the water pump 25 in the installed state. Therefore, in step S2, the first water pipe 28a is moved upward to remove the first water pipe 29a from the water pump 25.

[0076] In step S3, the water pump 25 is removed. In this embodiment, the water pump 25 is located on the front side of the sheet metal 27 in the front-rear direction of the casing 29, and the suction portion 25a of the water pump 25 is connected to the return pipe 33 via a joint 11 located on the rear side of the sheet metal 27. Therefore, in step S3, the water pump 25 is moved forward and removed.

[0077] In step S4, the water pump 25 is installed. In this embodiment, the water pump 25 is installed from the front so that the suction portion 25a of the water pump 25 faces rear. The water pump 25 is also installed so that the power wire 25c of the water pump 25 extends downwards.

[0078] When installing the water pump 25, the water pump 25 is positioned in front of the sheet metal 27, and the suction portion 25a of the water pump 25 is connected to the return pipe 33 via a joint 11 provided on the rear side of the sheet metal 27. The discharge portion 25b of the water pump 25 is also connected to the first portion 101 of the first water piping 28a. The electrical wire 25c of the water pump 25 is extended upward from below the water pump 25 along the outside of the right side plate 29c of the casing 29 and connected to the connector 56.

[0079] (4) Features (4-1) The hot water generator 1 according to this embodiment 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. The heat source unit 2 has a compressor 21, a casing 29, and a water pump 25. The casing 29 houses the compressor 21. The water pump 25 circulates water between the heat source unit 2 and the tank 3. The water pump 25 is located outside the casing 29.

[0080] Traditionally, the water pump is located inside the machine room of the heat source unit of a water heater. However, the machine room of the heat source unit is cramped due to the numerous pipes and components it houses. Placing the water pump inside the machine room makes the room more complex, making maintenance of the water pump difficult.

[0081] In the hot water generator 1 of this embodiment, the heat source unit 2 has a water pump 25, and the water pump 25 is located outside the casing 29 of the heat source unit 2.

[0082] In this hot water generator 1, the maintainability of the water pump 25 is improved, and the complexity inside the casing 29 of the heat source unit 2 is eliminated.

[0083] (4-2) In the hot water generating apparatus 1 according to this embodiment, the heat source unit 2 has a cover portion 60. The cover portion 60 is located on the outside of the casing 29. The water pump 25 is located on the inside of the cover portion 60.

[0084] In this hot water generator 1, a cover portion 60 is provided on the outside of the casing 29, so that it can be prevented from accidentally coming into contact with the water pump 25.

[0085] (4-3) In the hot water generator 1 according to this embodiment, the water pump 25 is located on the outside of the right side plate 29c of the casing 29. The heat source unit 2 includes a water heat exchanger 22, a first water pipe 28a, and a second water pipe 28b. The water heat exchanger 22 heats the water flowing in from the tank 3. One end of the first water pipe 28a is connected to the water pump 25, and the other end is connected to the water heat exchanger 22. One end of the second water pipe 28b is connected to the water heat exchanger 22, and the other end is connected to the pipe 4 between the heat source unit 2 and the tank 3 via a joint 11. The water pump 25 is removable from the heat source unit 2. The first water pipe 28a and the second water pipe 28b are located in a direction different from the direction of removal of the water pump 25.

[0086] In this hot water generator 1, the water pump 25 can be easily removed, improving maintainability.

[0087] (4-4) In the hot water generating device 1 according to this embodiment, the water pump 25 is located on the outside of the right side plate 29c of the casing 29. A sheet metal 27 is fixed perpendicularly to the right side plate 29c of the casing 29. In the front-rear direction of the casing 29, the water pump 25 is provided on the front side of the sheet metal 27, and the joint 11 is provided on the rear side of the sheet metal 27. In a front view of the heat source unit 2, the water pump 25, the sheet metal 27, and the joint 11 are arranged in that order from front to back.

[0088] In this hot water generator 1, a sheet metal 27 is provided between the water pump 25 and the joint 26, so that no extra force is applied to the water pump 25 during the installation and assembly of the hot water generator 1.

[0089] (4-5) In the hot water generator 1 according to this embodiment, the water pump 25 is located on the outside of the right side plate 29c of the casing 29. The power wires 25c of the water pump 25 are connected so as to extend downward toward the bottom of the water pump 25.

[0090] In this hot water generator 1, by connecting the electric wire 25c of the water pump 25 so that it extends downwards toward the bottom of the water pump 25, condensation water can be prevented from running down to the motor of the water pump 25.

[0091] (4-6) In the hot water generator 1 according to this embodiment, the water pump 25 is located on the outside of the right side plate 29c of the casing 29. The heat source unit 2 has a water heat exchanger 22. The water heat exchanger 22 heats the water flowing in from the tank 3. In the vertical direction of the heat source unit 2, the water pump 25 is located above the connection portion 128a between the water heat exchanger 22 and the first water pipe 28a and the connection portion 128b between the water heat exchanger 22 and the second water pipe 28b.

[0092] In this hot water generating device 1, the water pump 25 is positioned above the connection point 128a between the heat exchanger 22 and the first water pipe 28a and the connection point 128b between the heat exchanger 22 and the second water pipe 28b in the vertical direction of the heat source unit 2, making it easier to remove the water pump 25.

[0093] (4-7) In the hot water generator 1 according to this embodiment, the water pump 25 is located on the outside of the right side plate 29c of the casing 29. The heat source unit 2 has a connector 56. The connector 56 is located on the upper inside of the casing 29. The wires of the water pump 26 extend upward along the outside of the right side plate 29c of the casing 29 and are connected to the connector 56.

[0094] In this hot water generator 1, the power lines for the water pump 25 are positioned on the outside of the right-side plate 29c of the casing 29, making it easier to remove the water pump 25.

[0095] (5) Modified Examples (5-1) Modified Example 1A In this embodiment, the case in which the heat source unit 2 has a cover portion 60 and the water pump 25 is arranged inside the cover portion 60 has been described, but it is not limited to this. The water pump 25 may be arranged outside the casing 29 of the heat source unit 2, without the casing 29 being covered by the cover portion 60.

[0096] (5-2) Modification 1B In this embodiment, the case in which the heat source unit 2 has a cover portion 60 and the first water pipe 28a and the second water pipe 28b are arranged inside the cover portion 60 has been described, but it is not limited to this. The first water pipe 28a and the second water pipe 28b may be arranged outside the casing 29 of the heat source unit 2, without the casing 29 being covered by the cover portion 60.

[0097] (5-3) Modification 1C In this embodiment, an example has been described in which the water pump 25 is located outside the right side plate 29c of the casing 29 of the heat source unit 2, but it is not limited to this. The water pump 25 may also be located outside the front plate 29a of the casing 19.

[0098] Figure 10 shows the positional relationship between the water pump 25 and the water piping 28 of the heat source unit 2a in this modified example. When the water pump 25 is located outside the front plate 29a of the casing 19, the water pump 25 is located on the front side of the machine room. In other words, the water pump 25 is located on the front side of the machine room with the water piping 28 connected to it. When the water pump 25 is located outside the front plate 29a of the casing 19, the suction port 25a of the water pump 25 is positioned upwards and the discharge port 25b is positioned to the right.

[0099] When the water pump 25 is positioned outside the front plate 29a of the casing 29, the water pump 25 may be covered by the cover portion 60, or it may be positioned outside the front plate 29a without being covered by the cover portion 60.

[0100] (5-4) Modification 1D In this embodiment, an example has been described in which the water pump 25 is located outside the right side plate 29c of the casing 29 of the heat source unit 2. However, the water pump 25 may also be located outside the rear plate 29h of the casing 19.

[0101] Figure 11 shows the positional relationship between the water pump 25 and the water piping 28 of the heat source unit 2b in this modified example.

[0102] When the water pump 25 is located outside the rear plate 29h of the casing 19, the water pump 25 is located on the rear side of the machine room. In other words, the water pump 25 is located on the rear side of the machine room with the water piping 28 connected to it. When the water pump 25 is located outside the rear plate 29h of the casing 19, the water pump 25 is installed so that its suction port 25a faces upward and its discharge port 25b faces left.

[0103] When the water pump 25 is located outside the rear plate 29h of the casing 29, the water pump 25 may be covered by the cover portion 60, or it may be located outside the rear plate 29h without being covered by the cover portion 60.

[0104] (5-5) Modification 1E In this embodiment, an example has been described in which the water pump 25 is located outside the right side plate 29c of the casing 29 of the heat source unit 2c. However, the water pump 25 may also be located outside the top plate 29b of the casing 29.

[0105] Figure 12 is a perspective view showing the exterior of the heat source unit 2c in this modified example, with the cover removed, as seen from the upper right side of the front.

[0106] When the water pump 25 is located outside the top plate 29b of the casing 19, the water pump 25 is located above the machine room. In other words, the water pump 25 is located above the machine room, connected to the water piping 28. In this modified example, the water piping 28 extends upward from below the right side surface 29 of the casing 29, and further extends outside the top plate 29b so as to be connected to the water pump 25 located outside the top plate 29b. When the water pump 25 is located outside the top plate 29b, the water pump 25 is installed so that its suction port 25a faces rearward and its discharge port 25b faces to the right.

[0107] If the water pump 25 is located outside the top plate 29b of the casing 29, the water pump 25 may be covered by the cover portion 60, or it may be located outside the rear plate 29h without being covered by the cover portion 60.

[0108] In this modified example, the operating unit 50 is located on the outside of the front plate 29a of the casing 29. However, the arrangement of the operating unit 50 is not limited to this.

[0109] (5-6) Modification 1F 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. Furthermore, the refrigerant is not limited to one containing carbon dioxide.

[0110] (5-7) 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.

[0111] 1 Hot water generator 2, 2a, 2b, 2c Heat source unit 3 Tank 4 Water circulation piping (piping) 5 Control unit 11 Fittings 20 Refrigerant circuit 21 Compressor 22 Water heat exchanger (heat exchanger) 25 Water pump 25c Pump harness (electrical wires for water pump) 26 Refrigerant piping 27 Sheet metal 28 Water piping 28a First water piping 28b Second water piping 29 Casing 29a Front panel 29b Top panel 29c Right side panel (side panel) 29h Rear panel 31 Supply pipe 33 Return pipe 56 Connector 60 Cover section 128a, 128b Connection section

[0112] Japanese Patent Publication No. 2024-108391

Claims

1. A hot water generating device (1) comprising: a refrigerant circuit (20) through which a refrigerant is circulated, comprising: heat source units (2, 2a, 2b, 2c), a tank (3), and piping (4) between the heat source units and the tank, wherein the heat source units include a compressor (21), a casing (29) housing the compressor, and a water pump (25) for circulating water between the heat source units and the tank, and the water pump is located outside the casing.

2. The hot water generating apparatus according to claim 1, wherein the heat source unit has a cover portion (60) disposed on the outside of the casing, and the water pump is disposed on the inside of the cover portion.

3. The water pump is located outside of the side plate (29c), front plate (29a), or rear plate (29h) of the casing; the heat source unit includes a heat exchanger (22) that heats water flowing in from the tank; a first water pipe (28a) one end of which is connected to the water pump and the other end of which is connected to the heat exchanger; and a second water pipe (28b) one end of which is connected to the heat exchanger and the other end of which is connected to the pipe between the heat source unit and the tank via a joint (11); the water pump is removable from the heat source unit; and the first water pipe and the second water pipe are located in a position different from the direction in which the water pump is removed; the hot water generating apparatus according to claim 1 or 2.

4. The hot water generating apparatus according to claim 1 or 2, wherein the water pump is located on the outside of the side plate of the casing, a sheet metal (27) is fixed to the side plate of the casing between the water pump and the joint, the water pump is provided on the front side of the sheet metal in the front-rear direction of the casing, the joint is provided on the rear side of the sheet metal, and in a front view of the heat source unit, the water pump, the sheet metal, and the joint are arranged in that order from front to back.

5. The hot water generating apparatus according to any one of claims 1 to 4, wherein the water pump is located outside the side plate, front plate, or rear plate of the casing, and the power wires of the water pump are connected so as to extend downward toward the bottom of the water pump.

6. The hot water generating apparatus according to any one of claims 1 to 5, wherein the water pump is located on the outside of either the side plate, front plate, or rear plate of the casing, and in the vertical direction of the heat source unit, the water pump is located above the connection portion (128a) between the heat exchanger and the first water pipe and the connection portion (128b) between the heat exchanger and the second water pipe.

7. The hot water generating apparatus according to any one of claims 1 to 6, wherein the water pump is located on the outside of either the side plate, front plate, or rear plate of the casing, the heat source unit has a connector (56) located on the upper inside of the casing, and the power wires of the water pump extend upward along the outside of either the side plate, front plate, or rear plate of the casing and are connected to the connector.

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