JP2007271212A - Outdoor unit of heat pump water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outdoor unit of a heat pump water heater capable of improving cooling efficiency of a reactor. <P>SOLUTION: The outdoor unit 2 of the heat pump water heater has a plurality of electric components, an air blower chamber S1 provided with an air blower and a machine chamber isolated from the air blower chamber and is equipped with an evaporator 24 and a reactor 42. The evaporator 24 is provided in the air blower chamber and is a component of a refrigerant circuit of the heat pump water heater. The reactor 42 provided in the air blower chamber is one of the plurality of electric components and is used in an inverter circuit for controlling the outdoor unit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an outdoor unit of a heat pump water heater, and more particularly to an outdoor unit of a heat pump water heater having a blower chamber in which a blower is disposed and a machine room isolated from the blower chamber, and in which a reactor is provided.

  Conventionally, the interior of an outdoor unit of an air conditioner is provided with a blower chamber, a compressor, and the like in which a heat exchanger and a fan are arranged by a partition plate extending in the vertical direction and the front-rear direction in a front view as in Patent Document 1. It is divided into a machine room. A reactor and an electrical component unit containing various electrical components such as a power transistor and a capacitor are disposed in the machine room. By a control circuit in the reactor and electrical component unit, a blower fan, a compressor, etc. Drive power is supplied, and drive control is performed. The reactor that is an electrical component that performs this drive control (inverter control) needs to be cooled because it generates heat. In the outdoor unit of this air conditioner, an opening is provided in the partition plate to contact the space in the blower chamber. In this manner, the reactor is arranged to cool the reactor.

In addition, as disclosed in Patent Document 2, there is a case in which a reactor is disposed in a blower chamber so that the reactor is cooled by using an air flow by the blower.
JP-A-9-292142 JP 2005-114244 A

  However, in the outdoor unit of Patent Document 1, a part of the entire reactor that is in contact with the space in the blower room is a part, and it is difficult to sufficiently cool the entire reactor even if the flow of air by the outdoor fan is used. . Further, in the outdoor unit of Patent Document 2, heat is generated in the summer because the heat exchanger in the blower room mainly functions as a condenser, and the cooling efficiency of the reactor deteriorates. In the air conditioner, a reactor is arranged in a machine room as in Patent Document 1. In this way, the temperature of the reactor rises, causing restrictions on the use conditions of the reactor, and a higher-priced reactor with higher heat resistance is required, which increases costs. Further, in the case of a heat pump water heater, since the outdoor heat exchanger is used only as an evaporator, there may be a more optimal choice for the arrangement of the reactor.

  The subject of this invention is providing the outdoor unit of the heat pump water heater which can improve the cooling efficiency of a reactor.

  The outdoor unit of the heat pump water heater according to the first invention is an outdoor unit of a heat pump water heater having a plurality of electrical components and having a blower chamber in which the blower is arranged and a machine room isolated from the blower chamber, An evaporator and a reactor are provided. An evaporator is arrange | positioned at an air blower chamber and is a component of the refrigerant circuit of a heat pump water heater. The reactor is one of a plurality of electrical components, and is disposed in the blower room and used in an inverter circuit for controlling the outdoor unit.

Conventionally, electrical components that generate heat, such as reactors, are arranged on the machine room side and are hardly cooled, causing the temperature of the reactor to rise and causing restrictions on its use conditions. A high-priced reactor with heat resistance is required, which increases costs.
In the present invention, by arranging the reactor in the blower chamber where the blower is installed, the reactor can be cooled by the cold radiant heat of the evaporator that is always cold or by the air that passes through the evaporator and is cooler than the outside air. Thereby, generation | occurrence | production of the cause which restrictions on the use conditions of a reactor can be reduced, and cost can be reduced.

The outdoor unit of the heat pump water heater according to the second invention is the outdoor unit of the heat pump water heater according to the first invention, and the plurality of electrical parts other than the reactor are divided into a first electrical part and a second electrical part. Arranged. The first electrical component is located on the opposite side of the reactor with the second electrical component interposed therebetween.
In the outdoor unit of this heat pump water heater, the plurality of electrical components are classified into a reactor, a first electrical component, and a second electrical component, the first electrical component is composed of a weak electrical component, and the second electrical component is a strong electrical component. It consists of parts. And a reactor is located in the other side of the 1st electrical equipment part on both sides of the 2nd electrical equipment part.
For this reason, since the first electrical component is separated from the reactor that generates a large amount of heat, it is less susceptible to the heat generated by the reactor. Thereby, it can reduce that a malfunction generate | occur | produces in control of the control circuit by a 1st electrical equipment part.

  The outdoor unit of the heat pump water heater according to the third invention is the outdoor unit of the heat pump water heater according to the first invention or the second invention, and further includes an electrical component casing that can accommodate a plurality of electrical components therein. The electrical component casing accommodates a plurality of electrical components including a reactor therein.

  In the outdoor unit of this heat pump water heater, a plurality of electrical components such as a reactor and an inverter circuit are housed in the electrical component casing of the outdoor unit, so that the multiple electrical components can be shielded from moisture such as rain water. It is possible to prevent an electrical short circuit from occurring. Also, by collecting electrical components such as reactors and inverter circuits in one case, wiring work can be saved and wiring errors can be reduced. For this reason, the quality of a product can be improved.

The outdoor unit of the heat pump water heater according to the fourth invention is the outdoor unit of the heat pump water heater according to the third invention, and the electrical component casing has a cold air inlet. The cold air inlet can take in cold air in the vicinity of the reactor.
In the outdoor unit of this heat pump water heater, it is possible to take in low-temperature air cooled by the outside air passing through the evaporator from the cold air inlet to the vicinity of the reactor inside the electrical component casing. For this reason, it becomes possible to cool the reactor efficiently.

The outdoor unit of the heat pump water heater according to the fifth invention is the outdoor unit of the heat pump water heater according to the fourth invention, and the electrical component casing further has an air discharge port. The air discharge port can discharge air in the vicinity of the reactor to the side opposite to the evaporator side across the reactor.
In the outdoor unit of this heat pump water heater, an air discharge port is provided on the side opposite to the evaporator side, with the reactor interposed, in addition to the cold air inlet.
Thus, a path for cold air passing through the reactor can be formed. For this reason, it is possible to release the warmed air by taking in cold air from the cold air inlet and taking away the heat of the reactor in the vicinity of the reactor. Thereby, since cold air can be continuously supplied to the vicinity of the reactor, the reactor can be efficiently cooled.

  The outdoor unit of the heat pump water heater according to the sixth invention is the outdoor unit of the heat pump water heater according to the fourth invention or the fifth invention, and further includes a support member. The support member is provided at the lower part of the reactor and supports the bottom of the electrical component casing. The support member is made of metal and is in contact with the evaporator.

In the outdoor unit of the heat pump water heater, a support member made of metal and in contact with the evaporator supports the bottom of the electrical component casing. Since the support member is made of metal and is in contact with the evaporator, heat is easily lost to the evaporator.
Therefore, the reactor inside the electrical component casing can receive the cold radiant heat from the evaporator via the support member. As a result, the reactor inside the electrical component casing can be efficiently cooled.

The outdoor unit of the heat pump water heater according to the seventh invention is the outdoor unit of the heat pump water heater according to the sixth invention, and the support member has an opening through which air can pass. The opening is provided at a position where cold air can be taken into the electrical component casing from the cold air inlet, or at a position where cold air can be discharged from the air discharge port.
In this heat pump water heater, by providing the support member with an opening through which air can pass, cold air is taken in from the cold air intake port of the electrical component casing even if the support member is present. Further, by providing the support member with an opening through which air can pass, the air inside the electrical component casing is discharged from the air discharge port.

  As a result, even if there is a support member at the bottom of the electrical component casing, cold air is taken into the reactor or the air in the vicinity of the reactor is released without blocking the cold air inlet or the air outlet of the electrical component casing. be able to. In addition, since the support member is made of metal and is in contact with the evaporator, it is possible to further cool the cool air near the opening. For this reason, it becomes possible to cool the reactor efficiently.

The outdoor unit of the heat pump water heater according to the eighth invention is the outdoor unit of the heat pump water heater according to the first to seventh inventions, and the reactor is disposed in the upper space of the blower.
In the outdoor unit of this heat pump water heater, since the reactor is disposed in the upper space of the blower, the air cooled by the evaporator can be efficiently blown to the reactor. For this reason, it becomes possible to cool the reactor efficiently.

In the outdoor unit of the heat pump water heater according to the first aspect of the invention, the reactor is disposed in the blower chamber in which the blower is installed, so that the reactor is cooled by the cold radiant heat of the evaporator that is always cold or by air that is cooler than the outside air through the evaporator. Can be cooled. Thereby, generation | occurrence | production of the cause which restrictions on the use conditions of a reactor can be reduced, and cost can be reduced.
In the outdoor unit of the heat pump water heater according to the second aspect of the invention, the first electrical component is separated from the reactor that generates a large amount of heat, and thus is less susceptible to the heat generated by the reactor. Thereby, it can reduce that a malfunction generate | occur | produces in control of the control circuit by a 1st electrical equipment part.

  In the outdoor unit of the heat pump water heater according to the third aspect of the invention, a plurality of electrical components such as a reactor and an inverter circuit are accommodated inside the electrical component casing of the outdoor unit, so that the plurality of electrical components are removed from moisture such as rainwater. It is possible to cut off and prevent an electrical short circuit from occurring. Also, by collecting electrical components such as reactors and inverter circuits in one case, wiring work can be saved and wiring errors can be reduced. For this reason, the quality of a product can be improved.

In the outdoor unit of the heat pump water heater according to the fourth aspect of the invention, it is possible to take in low-temperature air cooled by passing outside air from the cold air inlet to the vicinity of the reactor inside the electrical component casing. For this reason, it becomes possible to cool the reactor efficiently.
In the outdoor unit of the heat pump water heater according to the fifth aspect of the invention, a path for cold air passing through the reactor can be formed. For this reason, it is possible to release the warmed air by taking in cold air from the cold air inlet and taking away the heat of the reactor in the vicinity of the reactor. Thereby, since cold air can be continuously supplied to the vicinity of the reactor, the reactor can be efficiently cooled.

In the outdoor unit of the heat pump water heater according to the sixth aspect, the reactor inside the electrical component casing can receive the cold radiant heat from the evaporator via the support member. As a result, the reactor inside the electrical component casing can be efficiently cooled.
In the outdoor unit of the heat pump water heater according to the seventh aspect of the present invention, even if there is a support member at the bottom of the electrical component casing, cold air is introduced into the vicinity of the reactor without blocking the cold air inlet or the air discharge port of the electrical component casing. The air in the vicinity of the reactor can be released. In addition, since the support member is made of metal and is in contact with the evaporator, it is possible to further cool the cool air near the opening. For this reason, it becomes possible to cool the reactor efficiently.

  In the outdoor unit of the heat pump water heater according to the eighth aspect of the invention, since the reactor is disposed in the upper space of the blower, the air cooled by the evaporator can be efficiently blown to the reactor. For this reason, it becomes possible to cool the reactor efficiently.

<Configuration of heat pump water heater>
The schematic block diagram of the heat pump water heater 1 by which one Embodiment of this invention is employ | adopted is shown in FIG.
The heat pump water heater 1 is a device that heats tap water by performing a vapor compression heat pump cycle operation and supplies hot water to a domestic bathtub or the like. The heat pump water heater 1 mainly includes a hot water storage unit 3 having a hot water storage tank 31 for storing hot water and an outdoor unit 2 having a heat pump cycle 20.

<Configuration of hot water storage unit>
The hot water storage unit 3 is mainly composed of a hot water storage tank 31 and a circulation pump 32.
The hot water storage tank 31 has a water supply port 33 on the bottom wall and a hot water outlet 34 on the upper wall. The hot water storage tank 31 is supplied with tap water from the water supply port 33, can discharge hot hot water stored in the hot water storage tank 31 from the hot water outlet 34, and can supply it to a bathtub or the like. In addition, a water intake 35 is opened in the bottom wall of the hot water storage tank 31, and a hot water inlet 36 is opened in the upper part of the side wall (circumferential wall). The water intake 35 and the hot water inlet 36 are connected to the circulation path 6. A circulation pump 32 and a water heat exchanger 22 of the outdoor unit 2 described later are connected to the circulation path 6.

  The circulation pump 32 is connected to the vicinity of the water intake 35 of the hot water storage tank 31. A water heat exchanger 22 is connected to the discharge side of the circulation pump 32. The circulation pump 32 causes unheated water in the hot water storage tank 31 to flow out from the water port 35 to the circulation path 6, and flows the unheated water into the heat exchange path 61 in the water heat exchanger 22. Unheated water that has flowed into the water heat exchanger 22 is heated in the heat exchange path 61 in the water heat exchanger 22 and returned to the hot water storage tank 31 from the hot water inlet 36.

<Heat pump cycle>
The outdoor unit 2 is installed outdoors and has a heat pump cycle 20. The heat pump cycle 20 mainly includes a compressor 21, a water heat exchanger 22 constituting a heat exchange path 61, an electric expansion valve 23 as an expansion mechanism, an evaporator 24, a liquid gas heat exchanger 25, and a muffler. 26 in order.

The compressor 21 is a compressor whose operating capacity can be varied. In the present embodiment, the compressor 21 is a rotary compressor driven by a motor whose rotational speed is controlled by an inverter.
The water heat exchanger 22 is a heat exchanger that functions as a refrigerant condenser. The water heat exchanger 22 condenses the high-temperature and high-pressure gas refrigerant compressed in the compressor 21 by exchanging heat with unheated water sent from the circulation pump 32 (heating the unheated water). The water heat exchanger 22 has a gas side connected to the discharge side of the compressor 21 and a liquid side connected to the electric expansion valve 23.

The electric expansion valve 23 is connected to the liquid side of the evaporator 24 by a refrigerant pipe, and adjusts the pressure and flow rate of the refrigerant flowing in the evaporator 24.
The evaporator 24 is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and heat-exchanges with outdoor air to evaporate the incoming liquid refrigerant.

  The liquid gas heat exchanger 25 includes a liquid refrigerant passage 25a through which the liquid refrigerant flowing out from the water heat exchanger 22 passes, and a gas refrigerant passage 25b through which the gas refrigerant flowing out from the evaporator 24 passes, and the water heat exchanger Heat exchange is performed between the liquid refrigerant flowing out of 22 and the gas refrigerant flowing out of the evaporator 24. That is, in the liquid gas heat exchanger 25, the liquid refrigerant passage 25a constitutes a part of the liquid refrigerant pipe 28 connecting the water heat exchanger 22 and the electric expansion valve 23, and the gas refrigerant passage 25b is compressed with the evaporator 24. A part of the gas refrigerant pipe 29 connecting the machine 21 is configured. The liquid gas heat exchanger 25 performs heat exchange between the high-pressure refrigerant that flows out of the water heat exchanger 22 and flows into the electric expansion valve 23, and the low-pressure refrigerant that flows out of the evaporator 24 and flows into the compressor. Further, it is possible to provide supercooling to the refrigerant that has flowed out of the water heat exchanger 22 and to heat the refrigerant that flows into the compressor 21 so as to approach an overheated state. For this reason, the degree of supercooling of the liquid refrigerant sent to the evaporator 24 can be increased, and the generation of flash gas in the liquid refrigerant tube 28 can be prevented. Further, the wet compression of the compressor 21 can be prevented, and a stable operation is possible.

The muffler 26 is connected between the liquid gas heat exchanger 25 and the suction side of the compressor 21 and is a device for reducing the pulsation of the refrigerant flow. Further, by securing the gas refrigerant sucked by the compressor 21, it is possible to prevent the compressor 21 from running out of the sucked gas, and the volume efficiency of the compressor 21 is improved.
The outdoor unit 2 has an outdoor fan 27. The outdoor fan 27 is a blower fan for sucking outdoor air into the unit and exchanging heat with the refrigerant in the evaporator 24 and then discharging the air outside. The outdoor fan 27 is a fan capable of changing the air volume of the air supplied to the evaporator 24. In this embodiment, the outdoor fan 27 is a fan motor 27a composed of a DC fan motor and a propeller fan driven by the fan motor 27a. 27b.

<Configuration of outdoor unit>
FIG. 2 is a perspective view of the outdoor unit 2 excluding the top plate and the front plate. Moreover, the top view except the top plate of the outdoor unit 2 is shown in FIG. 3A, and the bb cross-sectional view of FIG. 3A is shown in FIG. The outdoor unit 2 mainly includes an outdoor unit casing 7, a partition plate 74, a compressor 21, an evaporator 24, an outdoor fan 27, a fan motor support member 5, a fan motor 27 a, and an electrical component unit 4. The outdoor unit casing 7 has an exhaust port 71 on the front surface and an intake port 72 on the rear surface, and wind flows are generated by the outdoor fan 27 as indicated by white arrows A1 to A3 in FIG. The inside of the outdoor unit casing 7 is separated into a blower chamber S1 and a machine chamber S2 by a partition plate 74. Further, an evaporator 24 formed in an L shape is attached from the rear to the side of the outdoor fan 27, and a water heat exchanger 22 is disposed below the fan.

  In the blower chamber S1, a bell mouth 73 is provided inside the front exhaust port 71, and a fan motor support member 5 is installed behind the bell mouth 73 (see FIGS. 3A and 3B). . The fan motor support member 5 is made of metal and is in contact with the evaporator 24 so as to fix the upper portion of the fan motor support member 5 and the electrical component unit supporting the electrical component unit 4. It is comprised by the support part 5b and the fan motor support part 5c (refer FIG. 2). A fan motor 27a is fixed to the fan motor support 5c, and a propeller fan 27b is attached to a drive shaft of the fan motor 27a by a lock nut.

  The machine room S2 is a space sealed to some extent from the outside air in order to prevent moisture from entering. Moreover, components, such as the compressor 21, the electric expansion valve 23, and the muffler 26, are arrange | positioned in the downward space of the electrical equipment unit 4 of machine room S2. These components and the electrical component unit 4 are connected to each other by a wire harness (not shown). Furthermore, various thermistors (not shown) are arranged in the machine room S2, and these thermistors are also connected to the electrical component unit 4. On the other hand, the fan motor 27a arranged in the blower chamber S1 is also connected to the electrical component unit 4 by a wire harness.

  FIG. 4 is a schematic view showing a partitioning state between the blower room S1 and the machine room S2 by the partition plate 74, and is a top view of the outdoor unit 2. The partition plate 74 includes a first partition plate 74a extending in the front-rear direction and a second partition plate 74b extending in the left-right direction when viewed from above, and is formed in an L shape. The upper end of the partition plate 74 supports the bottom of the electrical component casing 41, and supports the electrical component casing 41 together with the electrical component unit support portion 5b. The lower end of the partition plate 74 extends to the bottom of the outdoor unit 2. Thus, the partition plate 74 partitions the machine room S2 together with a part of the bottom of the electrical component casing 41, and a space other than the machine room S2 in the outdoor unit 2 is used as the blower room S1.

<Structure and arrangement of electrical component unit>
The electrical component unit 4 is supported by the electrical component unit support portion 5b and the partition plate 74, and is disposed in the space above the outdoor unit 2 so as to straddle the blower chamber S1 and the machine chamber S2. The electrical component unit 4 includes electrical components for controlling the heat pump water heater 1, and mainly includes a printed wiring board 43, a reactor 42, and an electrical component casing 41. The printed wiring board 43 and the reactor 42 are arranged inside the electrical component casing 41 as shown in FIG. The reactor 42 is disposed on the opposite side of the second electrical component 45 with the first electrical component 44 of the printed wiring board 43 interposed therebetween.

  The printed wiring board 43 is mounted with electrical components such as a microcomputer chip for controlling each component of the outdoor unit 2 and a memory for storing a control program. Here, the electrical components on the printed wiring board 43 are divided into a first electrical component 44 and a second electrical component 45. The electrical components arranged in the first electrical component 44 are composed of strong electrical components such as diodes and power transistors among the electrical components. Moreover, the electrical component arrange | positioned at the 2nd electrical component part 45 is comprised by the weak electrical component. A heat radiation fin 48 is attached to the power transistor, and the heat radiation fin 48 is disposed in the blower chamber S <b> 1 so as to be exposed to the outside of the electrical component casing 41. The radiating fins 48 are cooled by passing through the evaporator 24 and receiving cool air (see white arrows A1 to A3 in FIG. 3A) that is sent from the outdoor fan 27 to assist cooling of the power transistor. .

  In the electrical component casing 41, a cold air intake 46 is opened on the evaporator 24 side below the reactor 42. An air discharge port 47 is opened on the opposite side of the cold air intake 46 with the reactor 42 interposed therebetween. As a result, the outside air cooled by the evaporator 24 can be taken into the electrical component casing 41 as indicated by white arrows A4 to A6 shown in FIGS. 5 (a) and 5 (b).

  The reactor 42 is disposed above the fan motor support member 5 and is cooled by receiving the radiant heat of the evaporator 24 via the fan motor support member 5 and the electrical component casing side surface 41b (FIG. 5). (See (b)). The fan motor support member 5 has an opening 51, and the opening 51 is at the same position as the cold air intake 46 opened in the electrical component casing 41. Therefore, the outside air cooled by the evaporator 24 can be taken from the opening 51 of the fan motor support member 5 and the cold air intake 46 of the electrical component casing 41. As shown by arrows A4 to A6 in FIGS. 5 (a) and 5 (b), it is possible to provide an air passage through which the outside air cooled by the evaporator 24 can pass inside the electrical component casing 41.

<Features>
(1)
In the outdoor unit 2 of the heat pump water heater 1, the reactor 42 is arranged in the blower chamber S <b> 1 where the outdoor fan 27 is installed, so that the cold radiant heat of the evaporator 24 or air that is cooler than the outside air passes through the evaporator 24. Can cool the reactor 42. This makes it difficult for the temperature of the reactor 42 to rise, thereby reducing the occurrence of a cause that restricts the use conditions of the reactor 42 and reducing costs.

(2)
In the outdoor unit 2 of the heat pump water heater 1, the plurality of electrical components are divided into a reactor 42, a first electrical component 44, and a second electrical component 45, and the first electrical component 44 is composed of high electrical components. And the 2nd electrical equipment part 45 is comprised by the weak electrical component. The reactor 42 is located on the opposite side of the second electrical component 45 with the first electrical component 44 interposed therebetween.

For this reason, since the 2nd electrical equipment part 45 leaves | separates from the reactor 42 with much calorific value, it becomes difficult to receive the influence of the heat_generation | fever of the reactor 42. Thereby, it can prevent that a malfunction generate | occur | produces in control of the control circuit in the 2nd electrical equipment part 45. FIG.
(3)
In the outdoor unit 2 of the heat pump water heater 1, the reactor 42 and the printed wiring board 43 are accommodated in the electrical component casing 41 of the outdoor unit 2. Therefore, the reactor 42 and the printed wiring board 43 can be shielded from moisture such as rainwater, and an electrical short circuit can be prevented. Further, by collecting the electrical components including the reactor 42 in one case, the labor of wiring can be saved and wiring errors can be eliminated. For this reason, the quality of a product can be improved.

(4)
In the outdoor unit 2 of the heat pump water heater 1, two types of openings are opened in the electrical component casing 41. One of the two types of openings is a cold air intake 46 for taking cold air into the vicinity of the reactor 42 inside the electrical component casing 41, and the other is for releasing air (hot air) near the reactor 42 inside the electrical component casing 41. This is the air discharge port 47.

Thereby, air having a temperature lower than that of the outside air can be taken into the electrical component casing 41 through the evaporator 24, and the hot air in the vicinity of the reactor 42 can be discharged to the outside of the electrical component casing 41. For this reason, the reactor 42 can be efficiently cooled.
(5)
In the outdoor unit 2 of the heat pump water heater 1, the electrical component casing 41 is made of metal and supported at the bottom by a fan motor support member 5 that is in contact with the evaporator 24. The fan motor support member 5 has an opening 51 through which cold air can be taken in. The opening 51 is provided at a position where cold air can be taken in from the cold air inlet 46 of the electrical component casing 41.

  Thereby, it becomes possible to receive the cold radiant heat from the evaporator 24 via the fan motor support member 5. Even if the fan motor support member 5 is provided at the bottom of the electrical component casing 41, it is possible to take in cold air from the cold air intake 46 without blocking the cold air intake 46. For this reason, the reactor 42 inside the electrical component casing 41 can be efficiently cooled.

(6)
In the outdoor unit 2 of the heat pump water heater 1, since the reactor 42 is disposed in the space above the outdoor fan 27, the air cooled by the evaporator 24 can be efficiently blown to the reactor 42. For this reason, the reactor 42 can be efficiently cooled.

<Other embodiments>
As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.
In the above embodiment, the cold air intake 46 that can take in cold air in the vicinity of the reactor 42 in the electrical component casing 41 and the air discharge port 47 that can discharge air (hot air) in the vicinity of the reactor 42 are provided separately. The reactor 42 may be cooled by providing one opening having these functions.

  The outdoor unit of the heat pump water heater according to the present invention can suppress the occurrence of the cause of restrictions on the use conditions of the reactor, and the outdoor unit of the heat pump water heater, in particular, the blower chamber and the blower in which the blower is disposed. It is useful as an outdoor unit of a heat pump water heater having a machine room isolated from the room and provided with a reactor.

The circuit schematic block diagram of the heat pump water heater concerning one Embodiment of this invention. The perspective view except the top plate and front plate of the outdoor unit. The top view except the top plate of the outdoor unit. bb sectional drawing. Schematic which showed the division | segmentation condition of air blower room S1 and machine room S2 by the partition plate 74. FIG. The top view except the top plate of the electrical component unit. bb sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat pump water heater 2 Outdoor unit 5 Fan motor support member (support part)
20 Heat pump cycle (refrigerant circuit)
24 Evaporator 27 Outdoor fan (blower)
41 Electrical component casing 42 Reactor 44 First electrical component 45 Second electrical component 46 Cold air intake (inlet)
47 Air outlet (outlet)
51 opening S1 blower room S2 machine room

Claims (8)

An outdoor unit (2) of a heat pump water heater having a plurality of electrical components and having a blower chamber (S1) in which a blower (27) is arranged and a machine room (S2) isolated from the blower chamber,
An evaporator (24) disposed in the blower chamber and being a component of a refrigerant circuit (20) of the heat pump water heater;
A reactor (42) that is one of the plurality of electrical components, is disposed in the blower chamber, and is used in an inverter circuit for controlling the outdoor unit;
An outdoor unit (2) of a heat pump water heater (1) comprising: The plurality of electrical components other than the reactor are arranged separately into a first electrical component (44) on which a high electrical component is mounted and a second electrical component (45) on which a weak electrical component is mounted,
The first electrical component is located on the opposite side of the reactor across the second electrical component,
The outdoor unit (2) of the heat pump water heater (1) according to claim 1. An electrical component casing (41) capable of accommodating the electrical component therein;
The electrical component casing accommodates the plurality of electrical components including the reactor therein.
The outdoor unit (2) of the heat pump water heater (1) according to claim 1 or 2. The electrical component casing has a cold air intake (46) capable of taking cold air in the vicinity of the reactor.
The outdoor unit (2) of the heat pump water heater (1) according to claim 3. The electrical component casing further includes an air discharge port (47) capable of discharging air in the vicinity of the reactor on a side opposite to the evaporator side across the reactor.
The outdoor unit (2) of the heat pump water heater (1) according to claim 4. A support member (5) provided at a lower part of the reactor and supporting a bottom of the electrical component casing;
The support member is made of metal and is in contact with the evaporator;
The outdoor unit (2) of the heat pump water heater (1) according to claim 4 or 5. The support member has an opening (51) through which cold air can pass,
The opening is provided at a position where cold air can be taken into the electrical component casing from the cold air inlet, or at a position where the cold air can be discharged from the discharge port.
The outdoor unit (2) of the heat pump water heater (1) according to claim 6. The reactor is disposed in an upper space of the blower.
The outdoor unit (2) of the heat pump water heater (1) according to any one of claims 1 to 7.

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