JPWO2019106780A1 - Air conditioner - Google Patents

Abstract

The present invention provides an air conditioner that suppresses the occurrence of dew condensation on an electric motor. The air conditioner is arranged at a position facing the refrigerant circuit through which the refrigerant flows and the first heat exchanger in which the compressor, the first heat exchanger, the expansion portion and the second heat exchanger are connected by pipes. A blower that sends air to the first heat exchanger is provided, and the blower is provided on the outer periphery of the boss portion and the boss portion having the facing surface facing the first heat exchanger to rotate the boss portion. The first heat exchanger has blades that rotate with the impeller, and an electric motor that is attached to the boss portion on the back surface side of the facing surface and drives the boss portion and the impeller to rotate. It has a facing portion and a boss facing portion that faces the boss portion and has a lower heat exchange performance than the blade facing portion.

Description

The present invention relates to an air conditioner that suppresses the occurrence of dew condensation on an electric motor.

BACKGROUND ART Conventionally, there is known an air conditioner in which an outdoor heat exchanger, an electric motor, and a boss are arranged in this order from the upstream of the air flow. When the air conditioner is performing heating, cold air flowing from the outdoor heat exchanger toward the electric motor lowers the temperature of the outer shell of the electric motor. Here, during heating, since cold air flows through the outdoor heat exchanger, frost may adhere to the outdoor heat exchanger. A defrosting operation is performed in order to remove frost attached to the outdoor heat exchanger. In the defrosting operation, the outdoor heat exchanger is heated by the warm air flowing from the outdoor heat exchanger toward the electric motor, and steam is generated. This increases the humidity around the electric motor. In this way, the humidity around the electric motor becomes high, so that dew condensation occurs in the electric motor, resulting in malfunction, which leads to malfunction of the entire air conditioner.

Patent Document 1 discloses an air conditioner in which a heat exchanger, a boss, and a fan motor are arranged in this order from the upstream of the air flow. Patent Document 1 is intended to suppress cooling of the electric motor due to cold air flowing from the heat exchanger not directly hitting the fan motor during heating.

JP-A-60-16276

However, in the air conditioner disclosed in Patent Document 1, the cool air flowing from the heat exchanger hits the boss portion and the boss portion is cooled. Therefore, the fan motor attached to the boss is also cooled. Therefore, in the defrosting operation, steam is generated by the warm air flowing from the heat exchanger and dew condensation occurs on the fan motor. As a result, problems such as defective signals in the electronic circuit, destruction or corrosion of elements, and rusting of the motor due to dew condensation occur.

The present invention has been made to solve the above problems, and provides an air conditioner that suppresses the occurrence of dew condensation on an electric motor.

In the air conditioner according to the present invention, the compressor, the first heat exchanger, the expansion section, and the second heat exchanger are connected by piping, and the refrigerant circuit in which the refrigerant flows and the first heat exchanger are opposed to each other. A blower for sending air to the first heat exchanger, wherein the blower has a boss portion having a facing surface facing the first heat exchanger and a boss provided on an outer circumference of the boss portion. The first heat exchanger has an impeller that rotates as the part rotates, and an electric motor that is attached to the boss on the back side of the facing surface and that drives the boss and the impeller to rotate. And a boss facing portion that faces the boss portion and has lower heat exchange performance than the blade facing portion.

According to the present invention, the heat exchange performance of the boss facing portion of the first heat exchanger is lower than that of the blade facing portion. Since the boss portion does not allow air to pass through, even if the heat exchange performance of the boss facing portion is low, the influence on the air sent by the blower is low. Further, during heating, the air passing through the boss facing portion is less likely to be heat-exchanged than the air passing through the blade facing portion, so that the boss facing portion is less likely to be cooled. Therefore, it is possible to suppress the occurrence of dew condensation on the electric motor during the defrosting operation.

It is a schematic diagram which shows the air conditioner 1 which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the air conditioner 1 which concerns on Embodiment 1 of this invention. It is a side sectional view showing the 1st heat exchanger 9 and fan 9a in Embodiment 1 of the present invention. It is a side sectional view showing fan 9a in Embodiment 1 of the present invention. FIG. 3 is a side sectional view showing an electric motor 33 according to the first embodiment of the present invention. It is a rear view which shows the 1st heat exchanger 9 and the air blower 9a in Embodiment 1 of this invention. It is a flowchart which shows operation|movement of the air conditioner 1 which concerns on Embodiment 1 of this invention. 6 is a side cross-sectional view showing a first heat exchanger 309 and a blower 9a in Comparative Example 1. FIG. 6 is a side cross-sectional view showing a first heat exchanger 309 and a blower 9a in Comparative Example 1. FIG. 7 is a flowchart showing an operation of the air conditioner 300 according to Comparative Example 1. 6 is a side cross-sectional view showing a first heat exchanger 409 and a blower 9a in Comparative Example 2. FIG. 9 is a flowchart showing an operation of the air conditioner 400 according to Comparative Example 2. It is a side sectional view showing the 1st heat exchanger 109 and fan 9a in Embodiment 2 of the present invention. It is a schematic diagram which shows the air conditioner 200 which concerns on Embodiment 3 of this invention.

Embodiment 1.
Embodiments of an air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an air conditioner 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the air conditioner 1 has an outdoor unit 2 provided outdoors and an indoor unit 3 provided indoors.

FIG. 2 is a circuit diagram showing the air conditioner 1 according to Embodiment 1 of the present invention. As shown in FIG. 2, the outdoor unit 2 is provided with a compressor 7, a flow path switching device 8, a first heat exchanger 9, a blower 9a, and an expansion section 10. The outdoor unit 2 is provided with a grill 2b that covers the blower 9a. The indoor unit 3 is provided with the second heat exchanger 11 and the indoor blower 11a.

(Refrigerant circuit 6)
The compressor 7, the flow path switching device 8, the first heat exchanger 9, the expansion section 10, and the second heat exchanger 11 are connected by the pipe 6a to form the refrigerant circuit 6. The compressor 7 sucks the refrigerant in the low temperature and low pressure state, compresses the sucked refrigerant, and discharges it as the high temperature and high pressure state refrigerant. The flow path switching device 8 switches the direction in which the refrigerant flows in the refrigerant circuit 6, and is a four-way valve, for example. The first heat exchanger 9 exchanges heat between, for example, outdoor air and a refrigerant.

The first heat exchanger 9 acts as a condenser during cooling operation and as an evaporator during heating operation. The blower 9a is a device that sends outdoor air to the first heat exchanger 9. The expansion unit 10 is a pressure reducing valve or an expansion valve that decompresses and expands the refrigerant. The expansion section 10 is, for example, an electronic expansion valve whose opening is adjusted. The 2nd heat exchanger 11 exchanges heat between indoor air and a refrigerant, for example. The second heat exchanger 11 functions as an evaporator during cooling operation and as a condenser during heating operation. The indoor blower 11 a is a device that sends indoor air to the second heat exchanger 11.

(Cooling operation)
Next, the cooling operation will be described. In the cooling operation, the refrigerant sucked into the compressor 7 is compressed by the compressor 7 and discharged in a high temperature and high pressure gas state. The high-temperature and high-pressure gas-state refrigerant discharged from the compressor 7 passes through the flow path switching device 8 and flows into the first heat exchanger 9 acting as a condenser, and in the first heat exchanger 9. , Is heat-exchanged with the outdoor air sent by the blower 9a to be condensed and liquefied.

The condensed liquid-state refrigerant flows into the expansion section 10 and is expanded and decompressed in the expansion section 10 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the second heat exchanger 11 acting as an evaporator, and in the second heat exchanger 11, heat is exchanged with the indoor air sent by the indoor blower 11a to evaporate. Gasify. At this time, the room air is cooled and the room is cooled. The evaporated low-temperature low-pressure gas-state refrigerant passes through the flow path switching device 8 and is sucked into the compressor 7.

(Heating operation)
Next, the heating operation will be described. In the heating operation, the refrigerant sucked into the compressor 7 is compressed by the compressor 7 and discharged in a high temperature and high pressure gas state. The high-temperature and high-pressure gas-state refrigerant discharged from the compressor 7 passes through the flow path switching device 8 and flows into the second heat exchanger 11 that functions as a condenser, and in the second heat exchanger 11. , Is heat-exchanged with the indoor air sent by the indoor blower 11a to be condensed and liquefied. At this time, the indoor air is warmed and the room is heated.

The condensed liquid-state refrigerant flows into the expansion section 10 and is expanded and decompressed in the expansion section 10 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the first heat exchanger 9 that functions as an evaporator, and in the first heat exchanger 9, heat is exchanged with the outdoor air sent by the blower 9a to evaporate gas. Turn into. The evaporated low-temperature low-pressure gas-state refrigerant passes through the flow path switching device 8 and is sucked into the compressor 7.

(Defrosting operation)
Next, the defrosting operation will be described. When the first heat exchanger 9 is cooled during heating, frost or ice adheres to the first heat exchanger 9. The defrosting operation is performed every predetermined time in order to prevent the heat exchange capacity from being lowered due to frost or ice. In the defrosting operation, the refrigerant sucked into the compressor 7 is compressed by the compressor 7 and discharged in a high temperature and high pressure gas state. The high-temperature and high-pressure gas-state refrigerant discharged from the compressor 7 passes through the flow path switching device 8 and flows into the first heat exchanger 9. As a result, the first heat exchanger 9 is heated, and the frost attached to the first heat exchanger 9 is removed.

The refrigerant that has passed through the first heat exchanger 9 flows into the expansion section 10 and is expanded and decompressed in the expansion section 10 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the second heat exchanger 11 that functions as an evaporator, is heat-exchanged with the room air in the second heat exchanger 11, and is evaporated and gasified. The evaporated low-temperature low-pressure gas-state refrigerant passes through the flow path switching device 8 and is sucked into the compressor 7.

FIG. 3 is a side sectional view showing the first heat exchanger 9 and the blower 9a according to the first embodiment of the present invention, which is a sectional view taken along the line AA of FIG. An electric motor support 2a is provided inside the outdoor unit 2, and a blower 9a is attached to the electric motor support 2a.

FIG. 4 is a side sectional view showing blower 9a according to Embodiment 1 of the present invention, and is an enlarged view of blower 9a shown in FIG. As shown in FIG. 4, the blower 9a has a boss portion 31, an impeller 32, and an electric motor 33. The boss portion 31 is provided on the downstream side of the first heat exchanger 9 and serves as a rotation shaft when the blower 9a rotates. The impeller 32 is provided on the outer periphery of the boss portion 31 and rotates as the boss portion 31 rotates.

FIG. 5 is a side sectional view showing electric motor 33 in accordance with the first exemplary embodiment of the present invention, and is an enlarged view of electric motor 33 shown in FIG. As shown in FIG. 5, the electric motor 33 includes a mounting foot 41, a mold resin 42, a bracket 43, a bearing 44, a shaft 45, a rotor 46, a stator core 47, a winding 48, and an insulating film. It has a substrate 49, a substrate 50, and a position detecting element 51. The mounting foot 41 is attached to the electric motor support 2a and fixes the electric motor 33 to the electric motor support 2a. The mold resin 42 and the bracket 43 form the outer shell of the electric motor 33. The bearing 44 is fixed to the mold resin 42 and the bracket 43 and smoothens the rotation of the shaft 45. The shaft 45 is attached to the boss portion 31 and rotates to rotate the boss portion 31.

The rotor 46 is provided on the inner circumference of the stator core 47, and the shaft 45 is inserted therein. The rotor 46 rotates the shaft 45 by rotating itself. The stator core 47 rotates the rotor 46 with the electric power supplied from the substrate 50. The winding 48 is, for example, a copper wire wound in the slot of the stator core 47. The insulating film 49 insulates the stator core 47 and the winding wire 48 from each other. The insulating film 49 may be resin or the like. The board 50 supplies electric power supplied from a power supply (not shown) to the stator core 47. The position detection element 51 is provided on the substrate 50 and detects rotation when the electric motor 33 is rotationally driven.

Here, an insulating film 49 is attached to the stator core 47 to insulate it from the winding 48, the winding 48 is wound in the slot of the insulated stator core 47, and the substrate 50 is attached to the insulating film 49. As a result, the stator portion is configured. The stator portion is sealed with the mold resin 42, and then the rotor 46 to which the bearing 44 and the shaft 45 are attached is inserted into the inside of the stator portion, and the rotor 46 is fixed by the bracket 43. As a result, the electric motor 33 is completed.

FIG. 6 is a rear view showing first heat exchanger 9 and blower 9a according to Embodiment 1 of the present invention. As shown in FIG. 3 and FIG. 6, inside the outdoor unit 2, the first heat exchanger 9 and the blower 9 a have the first heat exchanger 9, the boss portion 31, and the electric motor 33 from the upstream of the air flow. Are arranged in order. The boss portion 31 covers the electric motor 33. Thereby, when the electric motor 33 side is viewed from the boss portion 31 side, the electric motor 33 is hidden by the boss portion 31 and cannot be seen.

The first heat exchanger 9 has a boss facing portion 21 facing the boss portion 31 and a blade facing portion 22 facing the impeller 32. In the first embodiment, the boss facing portion 21 penetrates and becomes a space. In the first heat exchanger 9, the refrigerant and air are heat-exchanged in the blade facing portion 22, so that the air is cooled during heating. Further, since heat is not exchanged between the refrigerant and the air in the boss facing portion 21, the air is not cooled even during heating. The boss facing portion 21 does not have to penetrate, and may be thinner than the blade facing portion 22 as in the second embodiment.

Here, as shown in FIG. 3, the boss facing portion 21 side of the boss facing portion 21 is a housing portion 21 a in which a part of the boss portion 31 is housed. That is, when the first heat exchanger 9 is viewed from the side surface side, a part of the boss portion 31 overlaps with the first heat exchanger 9. The diameter of the boss facing portion 21 is longer than the diameter of the boss portion 31. As a result, the boss portion 31 fits into the boss facing portion 21. Further, as shown in FIG. 6, when the first heat exchanger 9 side is visually recognized from the rear surface side of the outdoor unit 2, the boss portion 31 and the impeller 32 are passed through the boss facing portion 21 of the first heat exchanger 9. Can be seen. The first heat exchanger 9 has fins 9c and heat transfer tubes 9b, and the heat transfer tubes 9b are arranged in the boss facing portion 21 between the fins 9c and the boss portion 31. The outer diameter of the boss portion 31 is longer than the outer diameter of the electric motor 33. As a result, the electric motor 33 is covered with the boss portion 31, and the air does not hit the electric motor 33.

Here, as described above, when frost adheres to the first heat exchanger 9 during heating, the defrosting operation is performed to remove the frost or ice adhered to the first heat exchanger 9. In the defrosting operation, the first heat exchanger 9 is heated by the warm air flowing from the first heat exchanger 9 toward the electric motor 33, and the frost or ice attached to the first heat exchanger 9 is melted. At the time of defrosting, when the melted frost or ice becomes water and is discharged to the outside of the outdoor unit 2, the first heat exchanger 9 generates high-humidity steam. The humidity around the electric motor 33 increases even when the steam reaches the electric motor 33 as it is or when the steam reaches the electric motor 33 when the electric motor 33 starts driving after defrosting.

FIG. 7: is a flowchart which shows operation|movement of the air conditioner 1 which concerns on Embodiment 1 of this invention. As shown in FIG. 7, when the heating operation is started (step ST1), the first heat exchanger 9 acting as an evaporator is cooled (step ST2). Here, since the electric motor 33 is covered by the boss portion 31, cold air does not pass through the surface of the electric motor 33 (step ST3). Further, in the first heat exchanger 9, the boss facing portion 21 penetrates, so that the refrigerant and the air are not heat-exchanged. Therefore, the air passing through the boss facing portion 21 is not cooled, so that the boss portion 31 is not exposed to the cool air (step ST4). In step ST3, the cold air does not pass through the surface of the electric motor 33, so the electric motor 33 is not cooled. Further, in step ST4, the boss portion 31 is not exposed to cold air, so that the electric motor 33 attached to the boss portion 31 is not cooled (step ST5).

Therefore, even if the defrosting operation is performed to remove the frost adhering to the first heat exchanger 9, steam is generated from the first heat exchanger 9 and the humidity around the electric motor 33 becomes high. (Step ST6), the temperature of the electric motor 33 has not dropped. Therefore, dew condensation does not occur on the electric motor 33 (step ST7). Then, the defrosting operation ends (step ST8), and the process returns to step ST1. Since no condensation occurs in the electric motor 33, no trouble occurs in the electric motor 33 (step ST9), and no trouble occurs in the air conditioner 1 due to the trouble in the electric motor 33 (step ST10).

According to the first embodiment, the boss facing portion 21 of the first heat exchanger 9 has lower heat exchange performance than the blade facing portion 22. Since the boss portion 31 does not allow air to pass therethrough, even if the heat exchange performance of the boss facing portion 21 is low, the influence on the air sent by the blower 9a is low. Further, during heating, the air passing through the boss facing portion 21 is less likely to undergo heat exchange than the air passing through the blade facing portion 22, so that the boss facing portion 21 is less likely to be cooled. Therefore, it is possible to suppress the occurrence of dew condensation on the electric motor 33 in the defrosting operation. Further, the boss facing portion 21 of the first heat exchanger 9 penetrates. Therefore, during heating, the air passing through the boss facing portion 21 is warmer than the air passing through the blade facing portion 22. Therefore, the boss portion 31 is less likely to be cooled than the impeller 32. Therefore, it is possible to suppress the occurrence of dew condensation on the electric motor 33 in the defrosting operation. As a result, the air conditioner 1 with high quality and high reliability and long life is realized. Further, since the boss portion 31 does not contribute to the function of the blower 9a, the heat exchange performance of the first heat exchanger 9 is not affected even if air does not hit the boss portion 31. Therefore, the performance of the air conditioner 1 as a whole does not deteriorate.

Further, the boss facing portion 21 side of the boss facing portion 21 is a housing portion 21 a in which a part of the boss portion 31 is housed. That is, when the first heat exchanger 9 is viewed from the side surface side, a part of the boss portion 31 overlaps with the first heat exchanger 9. Therefore, the gap between the boss portion 31 and the blade facing portion 22 is narrow. This makes it difficult for the air that has passed through the boss facing portion 21 to reach the impeller 32 through the gap between the boss portion 31 and the blade facing portion 22. Therefore, it is possible to prevent the air that has not undergone heat exchange from reaching the impeller 32 and being blown. That is, it is possible to suppress deterioration of the heat exchange performance. Further, since the distance between the first heat exchanger 9 and the blower 9a can be shortened, the outdoor unit 2 can be thinned. Therefore, it is possible to achieve both cost reduction and improvement in designability.

8 and 9 are side cross-sectional views showing the first heat exchanger 309 and the blower 9a in Comparative Example 1. As shown in FIG. 8, in the air conditioner 200 according to Comparative Example 1, the first heat exchanger 309, the electric motor 33, and the boss portion 31 are arranged in this order from the upstream of the air flow. When the air conditioner 300 is performing heating, the temperature of the outer shell of the electric motor 33 decreases due to the cold air flowing from the first heat exchanger 309 toward the electric motor 33. Here, frost adheres to the first heat exchanger 309. The defrosting operation is performed to remove the frost adhering to the first heat exchanger 309. As shown in FIG. 9, in the defrosting operation, the warm air flowing from the first heat exchanger 309 toward the electric motor 33 heats the first heat exchanger 309 to generate steam. This increases the humidity around the electric motor 33.

FIG. 10 is a flowchart showing the operation of the air conditioner 1 according to Comparative Example 1. As shown in FIG. 10, when the heating operation is started (step ST11), the first heat exchanger 309 acting as an evaporator is cooled (step ST12). Further, the air cooled by the first heat exchanger 309 passes through the surface of the electric motor 33 (step ST13). As a result, the electric motor 33 is cooled (step ST14).

When the defrosting operation is performed to remove the frost adhering to the first heat exchanger 309, the steam is generated from the first heat exchanger 309, and the humidity around the electric motor 33 becomes high (step ST15). The temperature of the electric motor 33 has dropped. Therefore, dew condensation occurs on the electric motor 33 (step ST16). Then, the defrosting operation ends (step ST17), and the process returns to step ST11. Since dew condensation occurs on the electric motor 33, a defect occurs on the electric motor 33 (step ST18), and a defect on the air conditioner 1 occurs due to a defect on the electric motor 33 (step ST19).

FIG. 11 is a side sectional view showing a first heat exchanger 409 and a blower 9a in Comparative Example 2. As shown in FIG. 11, in the air conditioner 400 according to Comparative Example 2, the first heat exchanger 409, the boss portion 31, and the electric motor 33 are arranged in this order from the upstream of the air flow. When the air conditioner 400 is performing heating, the cold air flowing from the first heat exchanger 409 toward the electric motor 33 does not directly hit the electric motor 33 because the electric motor 33 is covered by the boss portion 31. However, since the cool air hits the boss portion 31, the boss portion 31 is cooled. Therefore, the electric motor 33 attached to the boss portion 31 is also cooled.

FIG. 12 is a flowchart showing the operation of the air conditioner 400 according to Comparative Example 2. As shown in FIG. 12, when the heating operation is started (step ST21), the first heat exchanger 409 acting as an evaporator is cooled (step ST22). Here, since the electric motor 33 is covered by the boss portion 31, cold air does not pass through the surface of the electric motor 33 (step ST23). However, since the cool air hits the boss portion 31, the boss portion 31 is cooled (step ST24). As a result, the electric motor 33 is cooled (step ST25).

When the defrosting operation is performed to remove the frost adhering to the first heat exchanger 409, and steam is generated from the first heat exchanger 409 to increase the humidity around the electric motor 33 (step ST26). The temperature of the electric motor 33 has dropped. Therefore, dew condensation occurs on the electric motor 33 (step ST27). Then, the defrosting operation ends (step ST28), and the process returns to step ST21. Since dew condensation occurs on the electric motor 33, a defect occurs on the electric motor 33 (step ST29), and a defect on the air conditioner 1 occurs due to a defect on the electric motor 33 (step ST30).

When dew condensation occurs on the outer or inner portion of the electric motor 33 as in Comparative Example 1 and Comparative Example 2, moisture enters the inside of the electric motor 33, which causes malfunction of the air conditioner 300 and the air conditioner 400. For example, when water invades, the insulation resistance is reduced to cause a short circuit, a signal abnormality due to breakage or corrosion of the element, and internal disconnection due to the dew condensation water expanding as ice. Further, rusting of the bearing 44 causes abnormal noise, resulting in a defective sound. In contrast to Comparative Example 1 and Comparative Example 2, in the first embodiment, heat is not exchanged at the boss facing portion 21 in the first heat exchanger 9, so that the boss portion 31 is not exposed to cold air. Therefore, it is possible to prevent not only the cold air from directly hitting the electric motor 33 but also the electric motor 33 from being cooled via the boss portion 31. Therefore, it is possible to suppress dew condensation on the electric motor 33.

Embodiment 2.
FIG. 13 is a side cross-sectional view showing first heat exchanger 109 and blower 9a according to the second embodiment of the present invention. The air conditioner 100 of the second embodiment differs from the air conditioner 100 of the first embodiment in that the boss facing portion 121 does not penetrate. In the second embodiment, the same parts as those in the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted. Differences from the first embodiment will be mainly described.

As shown in FIG. 13, in the first heat exchanger 109, the boss facing portion 121 is thinner than the blade facing portion 122. According to the second embodiment, since the boss-facing portion 121 of the first heat exchanger 9 is thinner than the blade-facing portion 122, the boss-facing portion 121 is less likely to exchange heat than the blade-facing portion 122. Therefore, during heating, the air passing through the boss facing portion 121 is warmer than the air passing through the blade facing portion 122. Therefore, the boss portion 31 is less likely to be cooled than the impeller 32. Therefore, it is possible to suppress the occurrence of dew condensation on the electric motor 33 in the defrosting operation.

Even if the boss facing portion 121 does not penetrate like the second embodiment, the same effect as that of the first embodiment can be obtained. In the first and second embodiments, the case where the thickness of the boss facing portion 21 of the first heat exchanger 9 which is the outdoor heat exchanger is thinner than the thickness of the blade facing portion 22 is illustrated. The boss facing portion 21 of the second heat exchanger 11, which is an indoor heat exchanger, may be thinner than the blade facing portion 22.

Embodiment 3.
FIG. 14 is a schematic diagram showing an air conditioner 200 according to Embodiment 3 of the present invention. The third embodiment is different from the first embodiment in that the air conditioner 200 is a water heater. In the third embodiment, the same parts as those in the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted. Differences from the first embodiment will be mainly described.

As shown in FIG. 14, the air conditioner 200 includes the outdoor unit 2, a water storage tank 201, and a bathtub 202. The outdoor unit 2 is the same as that of the first embodiment. The water storage tank 201 is provided with the second heat exchanger 11 and can store water heated by the heat generated by the refrigerant circuit 6. Hot water stored in the water storage tank 201 is supplied to the bathtub 202, and hot water is filled therein.

Even if the air conditioner 200 is a water heater as in the third embodiment, it is possible to suppress the occurrence of dew condensation on the electric motor 33, as in the first embodiment. As a result, a high-quality, highly reliable and long-life water heater is realized.

DESCRIPTION OF SYMBOLS 1 air conditioner, 2 outdoor unit, 2a electric motor support, 2b grill, 3 indoor unit, 6 refrigerant circuit, 6a piping, 7 compressor, 8 flow path switching device, 9 1st heat exchanger, 9a blower, 9b heat transfer tube, 9c fin, 10 expansion part, 11 second heat exchanger, 11a indoor blower, 21 boss facing part, 21a accommodating part, 22 blade facing part, 31 boss part, 32 impeller, 33 electric motor, 41 mounting Foot, 42 mold resin, 43
Bracket, 44 bearing, 45 shaft, 46 rotor, 47 stator core, 48 winding, 49 insulating film, 50 substrate, 51 position detecting element, 100 air conditioner, 109 first heat exchanger, 121 boss facing part, 121a accommodation part, 200 air conditioner, 201 water tank, 202 bathtub, 300 air conditioner, 309 first heat exchanger, 400
Air conditioner, 409 First heat exchanger.

In the air conditioner according to the present invention, the compressor, the first heat exchanger, the expansion section, and the second heat exchanger are connected by piping, and the refrigerant circuit in which the refrigerant flows faces the first heat exchanger. And a blower for sending air to the first heat exchanger, the blower having a boss portion having a facing surface facing the first heat exchanger, and a boss portion provided on the outer periphery of the boss portion. The first heat exchanger has an impeller that rotates as the part rotates, and an electric motor that is attached to the boss on the back side of the facing surface and that drives the boss and the impeller to rotate. And a boss facing portion that faces the boss portion and has a lower heat exchange performance than the blade facing portion . The boss facing portion has the boss portion facing the upstream side of the air flow. A recessed accommodating portion is formed, and the boss portion is accommodated in the accommodating portion.

Here, as shown in FIG. 3, the boss facing portion 21 side of the boss facing portion 21 is a housing portion 21 a in which a part of the boss portion 31 is housed. That is, when the first heat exchanger 9 is viewed from the side surface side, a part of the boss portion 31 overlaps with the first heat exchanger 9. The diameter of the boss facing portion 21 is longer than the diameter of the boss portion 31. As a result, the boss portion 31 fits into the boss facing portion 21. Further, as shown in FIG. 6, when the first heat exchanger 9 side is visually recognized from the rear surface side of the outdoor unit 2, the boss portion 31 and the impeller 32 are passed through the boss facing portion 21 of the first heat exchanger 9. Can be seen. The first heat exchanger 9 has fins 9c and heat transfer tubes 9b, and the heat transfer tubes 9b are arranged in the boss facing portion 21 between the fins 9c and the boss portion 31. The outer diameter of the boss portion 31 is larger than the outer diameter of the electric motor 33. As a result, the electric motor 33 is covered with the boss portion 31, and the air does not hit the electric motor 33.

Claims (7)

A compressor, a first heat exchanger, an expansion section and a second heat exchanger are connected by piping, and a refrigerant circuit in which a refrigerant flows,
A blower which is arranged at a position facing the first heat exchanger and sends air to the first heat exchanger,
The blower is
A boss portion having a facing surface facing the first heat exchanger;
An impeller that is provided on the outer periphery of the boss portion and rotates with the rotation of the boss portion,
An electric motor that is attached to the boss portion on the back surface side of the facing surface, and that rotationally drives the boss portion and the impeller,
The first heat exchanger is
A blade facing portion facing the impeller,
An air conditioner comprising: a boss facing portion that faces the boss portion and has a heat exchange performance lower than that of the blade facing portion. The air conditioner according to claim 1, wherein the boss facing portion is thinner than the blade facing portion. The air conditioner according to claim 2, wherein the boss facing portion penetrates. The boss facing portion,
An accommodation portion is formed in which the boss portion side is recessed toward the upstream side,
The boss is
The air conditioner according to any one of claims 1 to 3, which is housed in the housing unit. The first heat exchanger has fins and heat transfer tubes,
The air conditioner according to any one of claims 1 to 4, wherein the heat transfer tube is arranged in the boss facing portion. The air conditioner according to any one of claims 1 to 5, wherein an outer diameter of the boss portion is longer than an outer diameter of the electric motor. The air conditioner according to any one of claims 1 to 6, further comprising a water storage tank that stores water heated by the heat generated by the refrigerant circuit.

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