JP6112212B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater.

  Heat pump water heaters that boil hot water using a refrigeration cycle (heat pump cycle) are widely used. A conventional heat pump water heater has a cooler box (equipment storage box) containing a water-refrigerant heat exchanger in front of an air heat exchanger, which is a finned-tube heat exchanger arranged on the rear side of the housing substrate. And the structure which arrange | positions the propeller fan type air blower which ventilates an air heat exchanger on this cooler box is common (for example, refer patent document 1). A gap through which air flows is provided between the air heat exchanger and the cooler box. When the propeller fan located in front of the air heat exchanger rotates, the outside air passes through the air heat exchanger and is sucked into the housing, and is discharged to the outside from the fan grill on the front surface of the housing.

  In a heat pump water heater, an air heat exchanger corresponds to an evaporator of a refrigeration cycle, and a water refrigerant heat exchanger corresponds to a condenser, and heat is transferred from refrigerant to water in the water refrigerant heat exchanger to produce hot water. In order to suppress the manufacturing cost and increase the energy saving performance without increasing the size of the casing, it is effective to increase the amount of air passing through the air heat exchanger.

Japanese Unexamined Patent Publication No. 2013-53776

  In the heat pump water heater as described above, the aerodynamic rotation sound generated by the rotation of the propeller fan of the blower may be noise. According to the inventor's research, the main causes are as follows. In the flow of air inside the heat pump water heater, the air flowing in from the air heat exchanger in the part facing the back of the cooler box flows upward along the back of the cooler box, and at the corners of the back and top of the cooler box It peels off and flows into the inner periphery of the propeller fan. As a result, in the vicinity of the upper surface of the cooler box, the inflow amount near the outer periphery of the propeller fan is small, and the inflow amount on the inner periphery side is increased. In other words, if you look at the rotating blade as a reference, when passing through the upper part of the cooler box, there is less inflow air near the outer periphery of the propeller fan than the front and rear (rotational axis direction vector is smaller), and inflow on the inner periphery side. There is a lot of air (the rotation axis direction vector is large). Such a change in the inflow state causes a pressure fluctuation on the blade surface, and noise corresponding to the cycle is generated from the blade. Thus, in the heat pump water heater having the above-described structure, the wind speed distribution of the air flowing into the blower is likely to be non-uniform, and therefore, an annoying aerodynamic rotation sound is easily generated by the blower.

  In the heat pump water heater disclosed in Patent Document 1, a motor that fixes a fan motor in order to guide an airflow that flows upward along the back surface of the cooler box during operation of the blower in a direction toward the outer peripheral region of the propeller of the propeller fan. A guide plate is provided between the supports. However, with such a configuration, it is not possible to guide the airflow that flows in from the portion of the air heat exchanger that faces the side surface of the cooler box and flows upward along the side surface of the cooler box. The airflow that flows upward along the side surface of the cooler box then flows in the back direction along the upper surface of the cooler box, merges with the rising airflow along the back surface described above, and flows into the inner periphery of the propeller fan. Therefore, for example, if the above-described guide plate is expanded in the left-right direction, there is a certain effect on uniforming the wind speed distribution of the air flowing into the blower, but the energy efficiency is reduced due to an increase in the blowing load. Is a problem. As described above, the above-described conventional heat pump water heater still leaves room for improvement in terms of reducing the aerodynamic rotation noise by uniforming the wind speed distribution of the air flowing into the blower while suppressing the decrease in energy efficiency. there were.

  This invention was made in order to solve the above subjects, and it aims at providing the heat pump water heater which can reduce the aerodynamic rotation sound of a fan, suppressing the fall of energy efficiency. .

The heat pump water heater according to the present invention includes a back-side air heat exchanger installed along the back surface in the housing, a side-side air heat exchanger installed along one side surface in the housing, and a bottom plate of the housing A device storage box installed above and facing the back side air heat exchanger and the side side air heat exchanger via a gap, a propeller fan disposed above the device storage box, and a radial direction of the propeller fan A bell mouth installed outside, a blower that blows air so that external air flows through the back side air heat exchanger and the side air heat exchanger, and a bell mouth from the top of the equipment storage box A prevention plate for preventing interference between the airflow flowing in from the front side of the housing from the suction side end of the bell mouth and the airflow flowing in from the back side of the housing from the suction side end , Is provided.

  According to the present invention, the prevention plate erected from the upper surface of the equipment storage box toward the bell mouth blocks the air flowing from the front side to the rear side of the bell mouth through the side air heat exchanger. The inflow amount (flow velocity) of the air flowing into the outer peripheral portion and the inner peripheral portion of the propeller fan is made uniform. Thereby, it becomes possible to provide the heat pump water heater which can reduce the aerodynamic rotation sound of a blower, suppressing the fall of energy efficiency.

It is the schematic of the refrigerant circuit with which the heat pump water heater of Embodiment 1 of this invention is provided. It is an external appearance front view of the heat pump water heater of Embodiment 1 of the present invention. It is an external appearance perspective view of the front side of the heat pump water heater of Embodiment 1 of the present invention. It is an external appearance perspective view of the back side of the heat pump water heater of Embodiment 1 of the present invention. It is AA sectional drawing of the heat pump water heater in FIG. It is BB sectional drawing of the heat pump water heater in FIG. It is a perspective view which shows the propeller fan and fan motor of the heat pump water heater of Embodiment 1 of this invention. It is the figure which looked at the inside of the heat pump water heater of Embodiment 1 of this invention from the back side. It is CC sectional drawing of the heat pump water heater in FIG. It is the figure which looked at the inside of the heat pump water heater of Embodiment 1 of this invention from the back side.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram of a refrigerant circuit provided in the heat pump water heater 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the refrigerant circuit included in the heat pump water heater 1 of the present embodiment includes a compressor 2, a water refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 5, in order of refrigerant pipes 6 a to 6 d. Connected and configured. The heat pump water heater 1 includes a blower 7 for allowing air to pass through the air heat exchanger 5.

  FIG. 2 is an external front view of heat pump water heater 1 according to Embodiment 1 of the present invention. FIG. 3 is an external perspective view of the front side of the heat pump water heater 1 according to Embodiment 1 of the present invention. FIG. 4 is an external perspective view of the back side of the heat pump water heater 1. FIG. 5 is a cross-sectional view of the heat pump water heater 1 taken along the line AA in FIG. And FIG. 6 is BB sectional drawing of the heat pump water heater 1 in FIG.

  As shown in FIG. 2 thru | or FIG. 6, the heat pump water heater 1 of this embodiment is provided with the housing | casing 9 which makes a substantially rectangular parallelepiped shape. The housing 9 is configured by mounting a front panel 9b, a side panel 9c, a side panel 9d, and a back panel 9e on a bottom panel 9a, and covering these top surfaces with a top panel 9f. . As shown in FIG. 2, the front panel 9 b is provided with a circular opening 19 for discharging air blown from the blower 7 covered with the bell mouth 18, and a net-like fan is provided so as to cover the circular opening 19. A grill 10 is provided. In FIG. 2, in order to illustrate the blower 7, the illustration of the fan grill 10 is partially omitted. As shown in FIG. 4, the side panel 9d and the back panel 9e are each provided with a large opening, and the air heat exchanger 5 is provided in these openings. The air heat exchanger 5 is substantially L-shaped, and includes a back side air heat exchanger 5a disposed inside the back panel 9e and a side air heat exchanger 5b disposed inside the side panel 9d. It is comprised by. In the air heat exchanger 5, the back side air heat exchanger 5a and the side side air heat exchanger 5b may be integrally formed in an L shape, or each may be configured as a separate body. Also good.

  A separator 11 is erected on the bottom panel 9a. As shown in FIG. 5, the inside of the housing 9 is partitioned into a machine chamber 12 and an air passage chamber 13 by the separator 11. The machine room 12 includes a compressor 2, an expansion valve 4 and the like, and the air passage chamber 13 has a cooler box (equipment storage box) 14 for storing the water-refrigerant heat exchanger 3, an air heat exchanger 5, and a blower. 7 etc. are arranged.

  The air heat exchanger 5 having a substantially L shape has the back side air heat exchanger 5a aligned with the back side of the casing 9, and the side air heat exchanger 5b aligned with one side of the casing 9, It is arranged on the bottom panel 9a. Moreover, as shown in FIG. 6, the cooler box 14 is arrange | positioned through the clearance gaps 20a and 20b between the back side air heat exchanger 5a and the side air heat exchanger 5b on the bottom panel 9a. Yes. A blower 7 is disposed on the cooler box 14. According to such a configuration, a larger air heat exchanger 5 is mounted in a limited size of the housing 9, and more air is passed through the air heat exchanger 5 to exchange air heat. It becomes possible to increase the heat exchange processing capacity of the vessel 5 and increase the efficiency of the heat pump cycle.

  The blower 7 includes a propeller fan 15 having a plurality of blades (blades), a bell mouth 18 disposed so as to cover the outer side in the radial direction of the propeller fan 15, and a fan motor 16 as an electric motor that rotationally drives the propeller fan 15. It has. The bell mouth 18 has a suction side and a blow-out side that extend radially outward, and the suction side end 18a is located radially outside the minimum inner diameter portion 18b. The fan motor 16 is fixed to the motor support 17. The motor support 17 has a pair of legs, and the lower ends of both legs are fixed to the upper surface 14 c of the cooler box 14. The rotation center line of the propeller fan 15 is disposed substantially horizontally and in a direction substantially perpendicular to the back side air heat exchanger 5a. The radius of the propeller fan 15 is slightly smaller than the distance from the rotation center line of the propeller fan 15 to the upper surface 14 c of the cooler box 14. The tip of the blade of the rotating propeller fan 15 passes near the upper surface 14c of the cooler box 14.

  Here, the names of the parts of the propeller fan 15 will be described. FIG. 7 is a perspective view showing the propeller fan 15 and the fan motor 16 of the heat pump water heater 1. As shown in FIG. 7, the surface of the propeller fan 15 facing in the rotational direction of the blade is referred to as a pressure surface 15a, and the opposite surface is referred to as a negative pressure surface 15b. Further, the edge of the wing directed in the rotation direction is referred to as a leading edge 15c.

FIG. 8 is a view of the inside of the heat pump water heater 1 as seen from the back side. In addition, in FIG. 8, the figure which saw through the back side air heat exchanger 5a and the back panel 9e is shown. Further, in FIG. 8, the position of the side air heat exchanger 5b is indicated by a broken line. 9 is a cross-sectional view taken along the line CC of the heat pump water heater 1 in FIG. 8 and is an enlarged view of a portion below the rotation center line of the propeller fan 15. As shown in FIG. 9, the back surface 14a (facing surface) of the cooler box 14 faces the lower region (partial region on the lower side) of the back side air heat exchanger 5a via the gap 20a. Yes. Moreover, as shown in FIG. 8, the side surface 14b of the cooler box 14 is opposed to the lower region (partial region on the lower side) of the side surface side air heat exchanger 5b via the gap 20b.

  As shown in FIGS. 8 and 9, on the upper surface 14c of the cooler box 14, the prevention plates 21a and 21b are provided along the back side air heat exchanger 5a (that is, along the longitudinal direction (left-right direction) of the cooler box 14). (Hereinafter, when these are not particularly distinguished, they are simply referred to as “prevention plate 21”). The prevention plate 21 flows in from the back side air heat exchanger 5a facing the back side 14a of the cooler box 14 when the blower 7 is operated, and passes through the gap 20a between the back side air heat exchanger 5a and the cooler box 14. This prevents interference between the rising airflow and the airflow flowing from the side air heat exchanger 5b. The prevention plate 21 a is provided on the upper surface 14 c on the side air heat exchanger 5 b side with respect to the rotation center of the propeller fan 15, and the prevention plate 21 b is on the machine chamber 12 side with respect to the rotation center of the propeller fan 15. On the upper surface 14c. The heights of the prevention plates 21 a and 21 b are set so as to be higher than the suction side end 18 a of the bell mouth 18 and to have a predetermined gap with respect to the outer peripheral surface of the bell mouth 18.

  Next, with reference to FIG. 1 and FIG. 5, operation | movement of the heat pump water heater 1 of this embodiment is demonstrated. First, the operation of the refrigerant circuit will be described. The refrigerant compressed to high temperature and high pressure by the compressor 2 flows into the water refrigerant heat exchanger 3 through the refrigerant pipe 6a. Water fed by a pump (not shown) provided inside or outside the housing 9 flows into the water refrigerant heat exchanger 3 from the water pipe 8a. In the water-refrigerant heat exchanger 3, the water flowing in from the water pipe 8a and the high-temperature and high-pressure refrigerant sent from the compressor 2 exchange heat, and the water is heated to become hot water and flows out from the water pipe 8b. Further, the high-temperature and high-pressure refrigerant is cooled by heat exchange with water, becomes a low-temperature and high-pressure state, and flows into the expansion valve 4 through the refrigerant pipe 6b. The refrigerant is decompressed to a low pressure state by the expansion valve 4 and flows into the air heat exchanger 5 through the refrigerant pipe 6c. The low-temperature and low-pressure refrigerant flowing into the air heat exchanger 5 is heated by exchanging heat with the air blown by the propeller fan 15 and evaporated to gasify. The gasified refrigerant flows out of the air heat exchanger 5 and is sucked into the compressor 2 through the refrigerant pipe 6d. The heat pump cycle is configured as described above.

  Next, the flow of air by the blower 7 will be described. When the propeller fan 15 is rotationally driven by the fan motor 16, the air whose pressure surface 15a of the propeller fan 15 is in the rotation region of the blade (orbit where the blade rotates) passes through the circular opening 19 of the front panel 9b from the circular opening 19 of the casing 9. As the air is discharged to the outside, the pressure on the suction surface 15b side decreases, and air is sucked into the rotation region of the blade. Due to the suction action of the propeller fan 15, the pressure inside the air passage chamber 13 is lowered, so that the air outside the housing 9 passes through the air heat exchanger 5 and is sucked into the air passage chamber 13.

  As can be seen from FIG. 6, the air heat exchanger 5 in the heat pump water heater 1 having the above-described structure has the rotation center of the propeller fan 15 in a portion that is present in a region lower than the rotation center line of the propeller fan 15. It is larger than the part existing in the area higher than the line. For this reason, the air flow rate in the air passage chamber 13 tends to be larger in a region lower than the rotation center line of the propeller fan 15 than in a region higher than the rotation center line of the propeller fan 15.

  Hereinafter, with reference to FIG.8 and FIG.9, the flow of the air of the cooler box 14 vicinity in the heat pump water heater 1 is demonstrated. In addition, the arrow in these figures has shown the flow of the air which flows into the clearance gaps 20a and 20b of the back surface 14a and the side surface 14b of the cooler box 14, and the air heat exchanger 5, and the subsequent air.

  As shown in FIGS. 8 and 9, the air that has passed through the back side air heat exchanger 5a and entered the gap 20a rises along the back side 14a (airflow A in the figure). On the other hand, of the air that has passed through the side air heat exchanger 5b and entered the gap 20b, the air that has flowed in from the back side of the suction side end 18a of the bell mouth 18 rises along the side surface 14b (in the drawing). Airflow B). The airflow A and the airflow B are peeled off at the corners on the back surface side and the side surface side of the upper surface 14c of the cooler box 14, further rise over the upper surface 14c, and the inner peripheral portion near the center in the rotation region of the propeller fan 15 Flow into.

  Of the air that flows through the side air heat exchanger 5b and flows into the gap 20b, the air that flows in from the side air heat exchanger 5b on the front side of the suction side end 18a of the bell mouth 18 is along the side 14b. (Airflow C in the figure). Part of the air that has passed through the side air heat exchanger 5b from near the height of the airflow A and the upper surface 14c of the cooler box 14 collides with the prevention plate 21a. Since these air flows flow into the air passage chamber 13 from the front side of the suction side end 18a of the bell mouth 18 and flow into the propeller fan 15 from the back side of the suction side end 18a, they flow from the front side to the back side. With vector components.

When the prevention plate 21a is not provided, the flow that flows in from the front side rather than the suction side end 18a passes through the gaps 20a and 20b between the back surface 14a and the side surface 14b and the air heat exchanger 5 on the top surface 14c of the cooler box 14. merge conflict with Re flow to rise. In this case, when the airflows A and B from the gaps 20 a and 20 b flow into the rotation region of the propeller fan 15, they flow into the inner peripheral portion closer to the center. As a result, in the vicinity of the cooler box 14 of the propeller fan 15, the amount of air flowing into the outer peripheral portion of the rotation region of the propeller fan 15 is small (the flow velocity is slow), and the air flows into the inner peripheral portion near the center. A non-uniform state occurs in which the amount of inflow is large (the flow rate is high). For this reason, every time the blades of the rotating propeller fan 15 pass through the upper part of the cooler box 14, fluctuations in the direction and speed of air incident on the leading edge 15 c and pressure fluctuations on the blade surface occur. Aerodynamic rotation noise (noise) is generated from the blades of the propeller fan 15.

  On the other hand, in the heat pump water heater 1 of this embodiment, the aerodynamic rotation sound can be reduced by providing the prevention plate 21a. That is, as shown in FIG. 9, the air flowing from the front side of the suction side end 18a of the bell mouth 18 is blocked by the prevention plate 21a before reaching the back side of the suction side end 18a of the bell mouth 18. It can be stopped. For this reason, the airflow A rising on the back surface 14a of the cooler box 14 and the airflow B rising on the back side from the suction end 18a of the bell mouth 18 rising from the side surface 14b interfere with the flow from the front side to the back side. Is prevented. Thereby, since the component from the front side to the back side is not added, the airflow A and the airflow B flow into a portion near the outer periphery of the rotation region of the propeller fan 15. As a result, the inflow amount (flow velocity) of air between the outer peripheral portion and the inner peripheral portion is not uniform in the rotation region of the upper portion of the cooler box on the side surface side provided with the air heat exchanger 5 from below the rotation center line of the propeller fan 15. The state is improved and uniformized. Thereby, fluctuations in the direction and speed of air incident on the leading edge 15c and pressure fluctuations on the blade surface when the blades of the rotating propeller fan 15 pass over the upper surface 14c of the cooler box 14 are suppressed. Generation of aerodynamic rotation noise can be suppressed. Furthermore, since the aerodynamic rotation noise of the propeller fan can be reduced, the rotation speed of the propeller fan can be increased and the flow rate of air passing through the air heat exchanger can be increased. As a result, the efficiency of the refrigerant cycle is increased, the compressor input is reduced, and a low-input heat pump water heater can be obtained.

Next, the prevention plate 21b will be described with reference to FIG. FIG. 10 is a view of the inside of the heat pump water heater 1 as seen from the back side. In addition, in FIG. 10, the figure which saw through the back side air heat exchanger 5a and the back panel 9e is shown.

  The ascending airflow C colliding with the prevention plate 21a passes through the air passage formed by the prevention plate 21a, the outer surface of the bell mouth 18, the front panel 9b, and the upper surface 14c of the cooler box 14, and flows around the separator 11 side. It becomes.

Here, when the prevention plate 21b is not provided, the airflow D that circulates to the separator 11 side rises in the gap 20a between the back surface 14a of the cooler box 14 and the upper surface 14c of the cooler box 14 on the separator 11 side. Colliding with the flowing air current A. Since the airflow D flowing into the separator side has a component that flows from the front side to the backside when colliding with the airflow A, the airflow A after joining the airflow A flows more into the rotation area of the propeller fan 15. It flows into the inner periphery near the center. As a result, the amount of air flowing into the outer peripheral portion of the rotation area of the propeller fan 15 is small (the flow velocity is slow), and the amount of air flowing into the inner peripheral portion near the center is large (the flow velocity is high). A uniform state occurs. For this reason, every time the blades of the rotating propeller fan 15 pass through the upper part of the cooler box 14, fluctuations in the direction and speed of air incident on the leading edge 15 c and pressure fluctuations on the blade surface occur. Aerodynamic rotation noise (noise) is generated from the blades of the propeller fan 15.

  On the other hand, in the heat pump water heater 1 of the present embodiment, the aerodynamic rotation sound can be reduced by providing the prevention plate 21b. That is, since the airflow D that has sneak to the separator 11 side is blocked by the prevention plate 21b, the airflow A that rises on the back surface 14a of the cooler box 14 may interfere with the airflow D that has sneak to the separator 11 side. It is prevented. Thereby, since the component from the front side to the back side is not added to the airflow A rising on the back surface 14 a of the cooler box 14, the airflow A flows into a portion near the outer periphery of the rotation area of the propeller fan 15. As a result, the inflow amount (flow velocity) of the air between the outer peripheral portion and the inner peripheral portion in the upper rotating region of the cooler box 14 on the side surface side including the air heat exchanger 5 from below the rotation center line of the propeller fan 15 is reduced. The uniform state is improved and uniformized. For this reason, when the blades of the rotating propeller fan 15 pass over the upper surface 14c of the cooler box 14, fluctuations in the direction and speed of air incident on the leading edge 15c and pressure fluctuations on the blade surface are suppressed. The generation of aerodynamic rotation noise can be suppressed. Moreover, since the aerodynamic rotation sound of the propeller fan 15 can be reduced, it is also possible to increase the rotation speed of the propeller fan 15 and increase the flow rate of air passing through the air heat exchanger. Thereby, it is possible to increase the efficiency of the refrigerant cycle, reduce the compressor input, and configure a low-input heat pump water heater.

  Thus, according to the heat pump water heater 1 of the present embodiment, by providing the prevention plate 21 on the upper surface 14c of the cooler box 14, the aerodynamic rotation sound of the blower can be reduced while suppressing the decrease in energy efficiency. Can do.

  Further, in the heat pump water heater 1 of the present embodiment, the height of the prevention plate 21 is higher than the suction side end 18a of the bell mouth 18 and a predetermined gap is formed with respect to the outer peripheral surface of the bell mouth 18. Is set. According to such a prevention plate 21, the airflow C blocked by the prevention plate 21 is dispersed in the circumferential direction from the gap when passing toward the separator 11, and exceeds the suction side end 18 a of the bell mouth 18. It flows into the rotation area of the propeller fan 15. Thereby, since the inflow to the rotation area of the propeller fan 15 is dispersed in the circumferential direction, the inflow speed to the propeller fan rotation area is made uniform without being in a non-uniform state. For this reason, when the blades of the rotating propeller fan 15 pass over the upper surface 14c of the cooler box 14, fluctuations in the direction and speed of air incident on the leading edge 15c and pressure fluctuations on the blade surface are suppressed. The generation of aerodynamic rotation noise can be effectively suppressed.

  By the way, in the heat pump water heater 1 of embodiment mentioned above, although the structure which provided both the prevention plates 21a and 21b was demonstrated, if it is the structure which provides the prevention plate 21a at least, the reduction effect of aerodynamic noise can be acquired. it can.

  DESCRIPTION OF SYMBOLS 1 Heat pump water heater, 2 Compressor, 3 Water refrigerant heat exchanger, 4 Expansion valve, 5 Air heat exchanger, 5a Back surface side air heat exchanger, 5b Side surface side air heat exchanger, 6 Refrigerant piping, 7 Blower, 8 Water piping, 9 housing, 9a bottom panel, 9b front panel, 9c side panel, 9d side panel, 9e back panel, 9f top panel, 10 fan grill, 11 separator, 12 machine room, 13 air channel room, 14 cooler Box, 14a back surface, 14b side surface, 14c top surface, 15 propeller fan, 15a pressure surface, 15b negative pressure surface, 15c front edge, 16 fan motor, 17 motor support, 18 bell mouth, 18a suction side end, 18b minimum inner diameter portion, 19 circular opening, 20 gap, 21 prevention plate

Claims (8)

A back-side air heat exchanger installed along the back in the housing;
A side air heat exchanger installed along one side in the housing;
An equipment storage box installed on the bottom plate of the housing and facing the back side air heat exchanger and the side side air heat exchanger via a gap;
A propeller fan disposed above the equipment storage box; and a bell mouth installed radially outward of the propeller fan; external air is used for the back side air heat exchanger and the side air heat exchange. A blower that blows air so as to flow through the vessel;
An airflow that flows from the front side of the housing rather than the suction side end of the bell mouth, and a rear side of the housing than the suction side end , which is erected from the upper surface of the device storage box toward the bell mouth. Prevention plate to prevent interference of airflow flowing in from ,
A heat pump water heater equipped with.   The heat pump water heater according to claim 1, wherein the back side air heat exchanger and the side side air heat exchanger are configured as an L-shaped integrated air heat exchanger.   The heat pump water heater according to claim 1, wherein the prevention plate is erected in a direction along the back surface.   The heat pump hot water supply according to any one of claims 1 to 3, wherein the prevention plate is provided in a range on a side where the side air heat exchanger is installed with respect to a horizontal position of a central axis of the propeller fan. Machine.   The heat pump according to any one of claims 1 to 4, wherein the prevention plate is provided in a range on a side where the side air heat exchanger is not installed with respect to a horizontal position of a central axis of the propeller fan. Water heater.   The heat pump water heater according to any one of claims 1 to 5, wherein the prevention plate has a gap with an outer peripheral surface of the bell mouth. The heat pump water heater is
A refrigerant circuit in which a compressor, a water-refrigerant heat exchanger, an expansion valve, the back-side air heat exchanger, and the side-side air heat exchanger are sequentially connected by piping;
A separator that divides the inside of the housing into a machine room and an air channel room,
The compressor and the expansion valve are disposed in the machine room,
The water refrigerant heat exchanger is stored in the device storage box,
The heat pump water heater according to any one of claims 1 to 6, wherein the blower and the device storage box are arranged in the air passage chamber.   The heat pump water heater according to any one of claims 1 to 7, wherein the prevention plate is provided so that a height thereof is higher than a suction side end of the bell mouth.

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