JP2014105971A - Outdoor unit for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit for an air conditioner increased in heat exchange efficiency in a heat exchanger.SOLUTION: An outdoor unit for an air conditioner includes a housing 1A having an opening side part to allow inflow of air, a heat exchanger 2 disposed along the side part within the housing 1A, an air outlet 3 provided in an upper part of the housing 1A, an air fan 4 provided in the upper part of the housing 1A, and a straightening plate 5 covering a bottom surface of a motor 4A in an opposite side to a side having the air fan 4 and reducing in its cross section area away from the motor 4A.

Description

  The present invention relates to an outdoor unit for an air conditioner that sucks air from a side surface of a housing and blows out air upward from the housing.

  As a conventional outdoor unit for an air conditioner, one that sucks air from a side surface portion of a casing and blows it out upward of the casing is known. As shown in FIG. 9, the outdoor unit 301 disclosed in Patent Document 1 includes a housing 301 </ b> A, a heat exchanger 302, a bell mouth 303 </ b> A, a blower 304, and a motor 304. The heat exchanger 302 is disposed on the side surface of the housing 301A. A bell mouth 303A having an air outlet 303 for blowing air upward is provided at the top of the housing 301A. The blower 304 is provided in the upper part of the housing 301A so as to suck air in the internal space of the housing 301A. A motor 304A is provided below the blower 304. The blower 304 is driven by the motor 304A.

  When the blower 304 is operated, air that has flowed in from the side surface of the housing 301A passes through the heat exchanger 302 and flows into the internal space of the housing 301A. Then, air is sucked from the internal space of the housing 301 </ b> A by the blower 304 and blown upward through the air outlet 303.

Japanese Utility Model Publication No.59-84373

  In order to improve the performance of the outdoor unit 301, it is effective to improve the heat exchange efficiency in the heat exchanger 302 by reducing the pressure loss of air.

  An object of this invention is to improve the heat exchange efficiency in a heat exchanger in the outdoor unit for air conditioners.

That is, this disclosure
A housing having a side surface that is open to allow inflow of air;
A heat exchanger disposed in the housing along the side surface;
An air outlet provided in the upper part of the casing so as to blow out the air guided to the internal space of the casing through the heat exchanger toward the upper side of the casing;
A blower that is provided at an upper portion of the housing and sucks air from the internal space of the housing;
A motor provided at a lower portion of the blower and driving the blower;
A rectifier that covers the bottom surface of the motor on the side opposite to the side where the blower is located, and whose cross-sectional area decreases as the distance from the motor increases;
An outdoor unit for an air conditioner comprising:

  According to said outdoor unit for air conditioners, the heat exchange efficiency in a heat exchanger can be improved.

The top view which abbreviate | omitted one part of the upper surface part of a housing | casing and the bell mouth which shows the outdoor unit for air conditioners which concerns on 1st Embodiment of this invention. The front view which abbreviate | omitted the side part of the housing | casing and the side part of the heat exchanger which shows the outdoor unit for air conditioners shown to FIG. 1A The side view which abbreviate | omitted the side part of the housing | casing and the side part of the heat exchanger which shows the outdoor unit for air conditioners shown to FIG. 1A The figure which shows the flow of the air inside the outdoor unit for air conditioners shown to FIG. 1A. The figure which shows the pressure distribution of the air inside the outdoor unit for air conditioners shown to FIG. 1A The figure which shows the flow of the air inside the conventional outdoor unit for air conditioners The figure which shows the pressure distribution of the air inside the conventional outdoor unit for air conditioners The top view which abbreviate | omitted some upper surface parts of the housing | casing and the bell mouth which show the outdoor unit for air conditioners which concerns on 2nd Embodiment of this invention. The front view which abbreviate | omitted the side part of the housing | casing and the side part of the heat exchanger which shows the outdoor unit for air conditioners shown to FIG. 4A The side view which abbreviate | omitted the side part of the housing | casing and the side part of the heat exchanger which shows the outdoor unit for air conditioners shown to FIG. 4A The figure which shows the flow of the air inside the outdoor unit for air conditioners shown to FIG. 4A. The figure which shows the flow of the air inside the outdoor unit for air conditioners shown to FIG. 1A. The top view of the rectification body concerning a 3rd embodiment of the present invention. Side view of the rectifier shown in FIG. 6A The figure which shows the flow of the air in the inside of the outdoor unit for air conditioners shown to FIG. 6A 1 is a configuration diagram of a building multi-air conditioning system in which the outdoor unit for an air conditioner shown in FIG. 1A is used. Front sectional view of a conventional outdoor unit for an air conditioner

  As shown in FIG. 9, in the conventional outdoor unit 301, the air sucked from the internal space of the housing 301A by the blower 304 collides with the bottom surface of the motor 304A, so that a large pressure loss occurs on the bottom surface of the motor 304A. In addition, since the air that collided with the bottom surface of the motor 304A flows from the bottom surface of the motor 304A through the side surface to the outlet 303, a relatively large pressure loss is caused on the side surface of the motor 304A due to separation of the boundary layer. Occur. When a large pressure loss occurs on the bottom and side surfaces of the motor 304A, the amount of air flowing into the internal space of the housing 301A is reduced, so that the heat exchange efficiency in the heat exchanger 302 is lowered.

The first aspect of the present disclosure is:
A housing having a side surface that is open to allow inflow of air;
A heat exchanger disposed in the housing along the side surface;
An air outlet provided in the upper part of the casing so as to blow out the air guided to the internal space of the casing through the heat exchanger toward the upper side of the casing;
A blower that is provided at an upper portion of the housing and sucks air from the internal space of the housing;
A motor provided at a lower portion of the blower and driving the blower;
A rectifier that covers the bottom surface of the motor on the side opposite to the side where the blower is located, and whose cross-sectional area decreases as the distance from the motor increases;
An outdoor unit for an air conditioner comprising:

  According to said structure, the quantity of the air which collides with the bottom face of a motor can be reduced with the rectifier which covers the bottom face of a motor. That is, the pressure loss at the bottom surface of the motor can be reduced. Further, the cross-sectional area of the rectifier decreases as the distance from the motor increases. Therefore, it is possible to avoid a large pressure loss caused by the rectifier. By reducing the pressure loss of air in the internal space of the housing, the amount of air flowing into the internal space of the housing is increased, and the heat exchange efficiency in the heat exchanger can be improved.

  In the second aspect, in addition to the first aspect, a first gap is formed between the rectifier and the bottom surface of the motor by disposing the rectifier at a position away from the bottom surface of the motor. The rectifying body passes through the upper end portion of the rectifying body on the side facing the bottom surface of the motor and the lower end portion of the rectifying body on the side opposite to the side facing the bottom surface of the motor. The internal space of the housing is formed of (a) a first flow for flowing air sucked by the blower to the air outlet through the ventilation hole and the first gap. There is provided an outdoor unit for an air conditioner, including: a path; and (b) a second flow path through which the sucked air flows to the outlet through the outside of the rectifier. According to such a configuration, the air sucked by the blower contacts the bottom surface of the motor via the ventilation hole and the first gap, so that the motor can be cooled. If the width of the first gap and the size of the ventilation hole are appropriately adjusted, it is possible to effectively suppress an increase in pressure loss due to air colliding with the bottom surface of the motor.

  According to a third aspect, in addition to the second aspect, the rectifier has a cylindrical portion covering a side surface of the motor, and is provided between an inner side surface of the cylindrical portion and the side surface of the motor. Has a second gap communicating with the first gap, and the first flow path is sucked by the blower via the ventilation hole, the first gap, and the second gap. An outdoor unit for an air conditioner, which is a flow path for allowing the air to flow to the air outlet, is provided. According to such a configuration, the air flowing through the second gap is brought closer to the side surface of the motor. As a result, pressure loss due to boundary layer separation on the sides of the motor is reduced. Moreover, since the air which passes the side surface of a motor contacts the side surface of a motor, a motor can be cooled.

  In a fourth aspect, in addition to any one of the first to third aspects, when the motor and the rectifier are viewed in a plan view from a direction parallel to the rotation axis of the motor, the entire bottom surface of the motor Provides an outdoor unit for an air conditioner that is housed inside the rectifier. According to such a configuration, the pressure loss at the bottom surface of the motor can be reliably reduced.

  According to a fifth aspect, in addition to any one of the first to fourth aspects, the rectifier provides an outdoor unit for an air conditioner, which is a member having a conical shape. According to such a configuration, it is possible to reliably avoid a large pressure loss caused by the rectifier.

  In a sixth aspect, in addition to the second or third aspect, the vent hole is inclined with respect to both a direction parallel to the rotation axis of the motor and a direction perpendicular to the rotation axis of the motor. The inner peripheral surface of the ventilation hole has a circumferential surface, and a groove extending from the upper end portion toward the lower end portion is formed, or a convex portion extending from the upper end portion toward the lower end portion. Provided is an outdoor unit for an air conditioner. According to such a configuration, since the air sucked by the blower can be easily guided to the side surface of the motor, the motor can be further cooled.

  In addition to any one of the first to sixth aspects, a seventh aspect further includes a motor support member that supports the motor, and the rectifier is fixed to the motor support member. Provide outdoor unit for aircraft. According to such a structure, installation of a rectifier becomes easy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

(First embodiment)
1A to 1C are views showing an internal configuration of an outdoor unit for an air conditioner according to the first embodiment of the present invention.

  As shown in FIGS. 1A to 1C, the outdoor unit 1 includes a housing 1A, a heat exchanger 2, a bell mouth 3A, a blower 4, a motor 4A, a rectifier 5, a control box 7, a compressor 8, an accumulator 9, and oil. A separator 10 is provided. The heat exchanger 2 is disposed in the housing 1A. The bell mouth 3A is provided in the upper part of the housing 1A and has an air outlet 3 that opens at the upper end. The blower 4 is disposed inside the bell mouth 3 </ b> A and is located below the blower outlet 3. The motor 4 </ b> A is disposed inside the bell mouth 3 </ b> A and is located below the blower 4. The motor 4 </ b> A drives the blower 4. The rectifier 5 covers the bottom surface of the motor 4A, and the cross-sectional area decreases as the distance from the motor 4A increases.

  The casing 1A is a rectangular parallelepiped case that is long in the vertical direction. Specifically, the housing 1A includes a first side surface portion 1B, a second side surface portion 1C, a third side surface portion 1D, and a fourth side surface portion 1E. The first side surface portion 1B, the second side surface portion 1C, and the third side surface portion 1D are open so as to allow inflow of air. The 4th side part 1E is constituted so that passage of air may be prohibited. Inside the housing 1A, a U-shaped heat exchanger 2 is arranged in plan view so as to be along the inside of the first side surface portion 1B, the second side surface portion 1C, and the third side surface portion 1D. A control box 7 is mounted and fixed inside the fourth side surface portion 1E.

  The control box 7 is a rectangular parallelepiped case containing a control circuit (not shown) for controlling electrical components such as the blower 4, and is fixed to the inner side surface of the fourth side surface portion 1E by screws. The inner side surface 7A of the control box 7 has a rectangular flat surface.

  In addition, arrangement | positioning of the heat exchanger 2 is not limited to said arrangement | positioning. For example, even when the heat exchanger 2 is arranged along the inside of a part of the fourth side surface part 1E when a part of the fourth side surface part 1E is configured to allow inflow of air. Good. It is not essential that the heat exchanger 2 is arranged in parallel to the vertical direction. The heat exchanger 2 may be inclined with respect to both the vertical direction and the horizontal direction. For example, the heat exchanger 2 may be disposed inside the housing 1A so that the heat exchanger 2 has a V shape.

  The bell mouth 3A is a cylindrical member that is provided above the upper end of the heat exchanger 2 and opens in a trumpet shape. The diameter of the opening at the lower end of the bell mouth 3A is larger than the diameter of the outlet 3 (opening at the upper end) of the bell mouth 3A. A blower 4 is arranged inside the bell mouth 3A.

  The blower 4 is rotated by a motor 4A arranged at the lower part of the blower 4, and sucks air from the internal space of the housing 1A. The blower 4 has a plurality of (for example, four) blades. The central axis of the blower 4 coincides with the center of the air outlet 3 (the center of the bell mouth 3A). The maximum outer diameter of the blower 4 is smaller than the diameter of the air outlet 3 which is the minimum inner diameter of the bell mouth 3A. The vertical lengths of the blower 4 and the motor 4A are smaller than the vertical length of the bell mouth 3A. That is, the blower 4 and the motor 4A are disposed inside the bell mouth 3A.

  The outdoor unit 1 further includes a first support member 6A and a second support member 6B. The first support member 6A and the second support member 6B connect the upper portion of the second side surface portion 1C and the upper portion of the fourth side surface portion 1E at the position of the upper end portion of the heat exchanger 2, respectively. The first support member 6A and the second support member 6B are flat and rod-like members arranged in parallel with the first side surface portion 1B and the third side surface portion 1D. The first support member 6A and the second support member 6B are separated from the central axis of the motor 4A toward the first side surface portion 1B and the third side surface portion 1D, respectively. The distance between the central axis of the motor 4A and the first support member 6A is the same as the distance between the central axis of the motor 4A and the second support member 6B. The first support member 6A and the second support member 6B cross the upper part of the heat exchanger 2 and the upper part of the control box 7 in the second side surface part 1C.

  The outdoor unit 1 further includes a third support member 6C and a fourth support member 6D. The third support member 6C and the fourth support member 6D are fixed to the upper surfaces of the first support member 6A and the second support member 6B by screws, respectively. The third support member 6C and the fourth support member 6D are flat and rod-like members disposed in parallel with the second side surface portion 1C and the fourth side surface portion 1E. The third support member 6C and the fourth support member 6D are separated from the central axis of the motor 4A toward the second side surface portion 1C and the fourth side surface portion 1E, respectively. The distance between the central axis of the motor 4A and the third support member 6C is the same as the distance between the central axis of the motor 4A and the fourth support member 6D.

  The lower end of the motor 4A is fixed to the third support member 6C and the fourth support member 6D with screws. The motor 4A is built in a cylindrical case member attached to the lower end of the blower 4. This case member also constitutes a part of the motor 4A. Therefore, the lower end portion of the motor 4A means the lower end portion of the cylindrical case member.

  The heat exchanger 2 has an inner portion corresponding to each of the first side surface portion 1B, the second side surface portion 1C, and the third side surface portion 1D as the first heat exchange portion 2A, the second heat exchange portion 2B, and the third heat exchange. It has part 2C. The minimum distance between the central axis of the blower 4 and the first heat exchange unit 2A is the minimum distance between the central axis of the blower 4 and the second heat exchange unit 2B and the central axis of the blower 4 and the third heat. It is the same as the minimum distance between the exchange unit 2C. In addition, the minimum distance between the central axis of the blower 4 and the first heat exchange unit 2 </ b> A is the same as the minimum distance between the central axis of the blower 4 and the inner side surface 7 </ b> A of the control box 7. That is, a region surrounded by the first side surface portion 1B, the second side surface portion 1C, the third side surface portion 1D, and the inner side surface 7A of the control box 7 is a square in plan view.

  As shown in FIG. 2A, the rectifying body 5 has a main body 5A, and a ventilation hole 5B formed so as to penetrate the upper end 5E and the lower end 5F of the main body 5A. The rectifier 5 is disposed at a position away from the bottom surface of the motor 4A. A first gap 5C is formed between the upper end portion 5E of the rectifier 5 and the bottom surface of the motor 4A. Ventilation hole 5B is one through-hole penetrating the central portion of main body 5A. The ventilation hole 5B has a circular opening at the center of the upper end 5E of the main body 5A and the lower end 5F of the main body 5A. These openings have the same diameter. The arrangement, the opening shape, and the number of the ventilation holes 5B are not limited to these.

  The outdoor unit 1 further includes a fifth support member 6E and a sixth support member 6F. Upper ends of the fifth support member 6E and the sixth support member 6F are fixed to the lower surfaces of the first support member 6A and the second support member 6B with screws. The lower ends of the fifth support member 6E and the sixth support member 6F protrude toward the central axis direction of the blower 4, respectively.

  As shown in FIG. 1B, the rectifier 5 is supported by a fifth support member 6E and a sixth support member 6F, and is positioned below the motor 4A. The protruding lower ends of the fifth support member 6E and the sixth support member 6F are fixed to the outer peripheral portion of the rectifying body 5 with screws. The lower end of the motor 4A is fixed to the third support member 6C and the fourth support member 6D with screws. Further, the central axis of the rectifier 5 coincides with the central axis of the motor 4A. The method of fixing the rectifying body 5 is not limited to this. For example, a flange portion having a larger diameter than the outer shape of the rectifying body 5 is formed on the outer periphery of the rectifying body 5, and the fifth support member 6E and the sixth The support member 6F may be fixed to the flange portion with a screw.

  As shown in FIG. 1B and FIG. 1C, the internal space of the housing 1A has a first flow path 11 for flowing the air sucked by the blower 4 through the ventilation hole 5B and the first gap 5C to the outlet 3; And a second flow path 12 through which air sucked through the outside of the rectifying body 5 flows to the outlet 3. The amount of air flowing through the second flow path 12 is greater than the amount of air flowing through the first flow path 11. According to this configuration, the air sucked by the blower 4 can reduce the amount of air that collides with the bottom surface of the motor 4A by passing through the second flow path 12 passing through the outside of the rectifier 5. The pressure loss at the bottom surface of the motor 4A can be reduced. By reducing the pressure loss of air in the internal space of the housing 1A, the amount of air flowing into the internal space of the housing 1A increases, and the heat exchange efficiency in the heat exchanger 2 can be improved. Further, since the air sucked by the blower 4 comes into contact with the bottom surface of the motor 4A via the ventilation holes 5B and the first gap 5C, the motor 4A can be cooled.

  The rectifying body 5 is a member having a conical shape whose cross-sectional area decreases as the distance from the motor 4A decreases. As shown in FIG. 2A, the upper end 5E and the lower end 5F of the main body 5A are circular in plan view. The bottom surface of the motor 4A is circular in plan view. The outer diameter of the bottom surface of the motor 4A is smaller than the outer diameter of the upper end portion 5E of the main body portion 5A. The outer diameter of the lower end part 5F of the main body part 5A is smaller than the outer diameter of the upper end part 5E of the main body part 5A. The outer diameter of the lower end 5F of the main body 5A is smaller than the outer diameter of the bottom surface of the motor 4A. The outer diameter of the lower end 5F of the main body 5A is slightly larger than the opening of the ventilation hole 5B in the lower end 5F of the main body 5A. According to this configuration, since the cross-sectional area of the rectifying body 5 decreases as the distance from the motor 4A increases, it is possible to reliably avoid a large pressure loss caused by the rectifying body 5. Further, since the center axis of the rectifier 5 coincides with the center axis of the motor 4A, the upper end portion 5E of the main body 5A is circular in plan view, and the bottom surface of the motor 4A is circular in plan view, the motor 4A Circumferential air flow distribution is uniform. As a result, pressure loss due to boundary layer separation on the sides of the motor is reduced. Note that the shape of the rectifying body 5 is not limited to a conical shape, and may be, for example, a pyramid shape in which the cross-sectional area decreases as the distance from the motor 4A decreases. Further, the shape of the rectifying body 5 is a shape composed of a plurality of pyramids whose cross-sectional area decreases as the distance from the motor 4A decreases, and the rate of change in which the cross-sectional area decreases depending on the position of the rectifying body 5 in the vertical direction. Also good.

  When the motor 4 </ b> A and the rectifier 5 are viewed in plan, the entire bottom surface of the motor 4 </ b> A is within the upper end of the rectifier 5. That is, the upper end of the rectifier 5 completely covers the bottom surface of the motor 4A. According to this configuration, pressure loss at the bottom surface of the motor 4A can be reliably reduced.

  About the outdoor unit 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, as a comparison, FIG. 3A and FIG. 3B show aspects of air flow in a conventional outdoor unit 401, and the operation thereof will be described. In addition, the conventional outdoor unit 401 is the same as the structure which remove | excluding the rectifier 5, the 5th supporting member 6E, and the 6th supporting member 6F from the outdoor unit 1 of this embodiment. The sizes of the housing 401A, the heat exchanger 402, the bell mouth 403A, and the blower 404 are the same as those of the housing 1A, the heat exchanger 2, the bell mouth 3A, and the blower 4. It is assumed that the power consumption of the motor 404A is the same as the power consumption of the motor 4A.

  The air flow distribution 430 inside the conventional outdoor unit 401 is shown in FIG. 3A. In the conventional outdoor unit 401, the air sucked from the internal space 420 of the housing 401A by the blower 404 collides with the bottom surface of the motor 404A, so that a large pressure loss occurs on the bottom surface of the motor 404A. In addition, since the air colliding with the bottom surface of the motor 404A flows from the bottom surface of the motor 404A through the side surface to the blower outlet 403, a relatively large pressure loss occurs due to separation of the boundary layer on the side surface of the motor 404A. To do. When a large pressure loss occurs on the bottom surface and side surface of the motor 404A, the amount of air flowing into the internal space 420 of the housing 401A decreases, and the heat exchange efficiency in the heat exchanger 402 decreases.

  FIG. 3B shows the air pressure distribution in the vertical direction of the internal space 420 of the housing 401A on the central axis of the blower 404. In FIG. 3B, the air pressure distribution 450 in the vertical direction of the internal space 420 of the housing 401A is indicated by a solid line, and the atmospheric pressure 40 that is the ambient pressure of the housing 401A is indicated by a broken line. Here, a position directly below the blower 404 is set as a reference point in the vertical direction. Directly below the blower 404 is the position directly below the bottom surface of the motor 404A, that is, the position of the upper end of the heat exchanger 402.

  Next, FIGS. 2A and 2B show the air flow and the pressure distribution of the air inside the outdoor unit 1 of the present embodiment, and the operation will be described.

  The air flow distribution 30 inside the outdoor unit 1 of this embodiment is shown in FIG. 2A. The amount of air flowing into the internal space 20 of the housing 1A of the present embodiment is larger than the amount of air flowing into the internal space 420 of the conventional housing 401A. In the present embodiment, the air sucked by the blower 4 flows through the second flow path 12 along the rectifier 5, so that the amount of air colliding with the bottom surface of the motor 4A can be reduced. That is, the pressure loss at the bottom surface of the motor 4A can be reduced. By reducing the pressure loss of air in the internal space 20 of the housing 1A, the amount of air flowing into the internal space 20 of the housing 1A increases, and the heat exchange efficiency in the heat exchanger 2 can be improved.

  FIG. 2B shows the pressure distribution of the air in the vertical direction of the internal space 20 of the housing 1 </ b> A on the central axis of the blower 4. In FIG. 2B, the vertical air pressure distribution 50 in the internal space 20 of the housing 1A of the present embodiment is indicated by a solid line, and the vertical air pressure distribution 450 in the internal space 420 of the conventional housing 401A is indicated by a broken line. The atmospheric pressure 40 that is the ambient pressure of the housing 1A is indicated by a broken line. Here, a position directly below the blower 4 is a vertical reference point. Directly below the blower 4 is directly below the bottom surface of the motor 4A and is the position of the upper end portion 5E of the rectifier 5. The position of the upper end portion 5E of the rectifier 5 is the position of the upper end portion of the heat exchanger 502.

  As shown in FIG. 2B, the air pressure in the first flow path 11 is specified by a pressure distribution 50A between the pressure P1 and the pressure P2. The pressure of the air below the lower end portion 5F of the rectifier 5 is specified by a pressure distribution 50B that is equal to or higher than the pressure P2. As can be understood by comparing the pressure distribution 50 and the pressure distribution 450, the air pressure immediately below the bottom surface of the motor 4 </ b> A is increased by installing the rectifier 5. Therefore, in this embodiment, the amount of air flowing below the motor 4A is smaller than the amount of air flowing below the motor 404A in the conventional outdoor unit 401. As a result, the amount of air that collides with the bottom surface of the motor can be reduced. That is, the pressure loss at the bottom surface of the motor can be reduced. From the above, the amount of air flowing into the internal space 20 of the housing 1A increases, and the heat exchange efficiency in the heat exchanger 2 can be improved. The pressure P2 at the lower end 5F of the rectifier 5 may be an intersection of the pressure distribution 50 of the present embodiment and the conventional pressure distribution 450.

  Next, with reference to FIG. 8, the multi air conditioning system for buildings in which the outdoor unit 1 is used will be described.

  The multi air conditioning system for buildings includes the outdoor unit 1, indoor units 91A and 91B, and refrigerant pipes 93A, 93B, 96A and 96B. The outdoor unit 1 is disposed outside the building 90. The indoor units 91A and 91B are disposed in indoor rooms 90A and 90B of the building 90, respectively. The refrigerant pipes 93A and 96A connect the outdoor unit 1 and the indoor unit 91A. The refrigerant pipes 93B and 96B connect the outdoor unit 1 and the indoor unit 91B. The refrigerant pipes 93A and 93B are one pipe in the vicinity of the outdoor unit 1, but are branched into two pipes between the room 90B and the room 90A. The same applies to the refrigerant pipes 96A and 96B. In the present embodiment, two indoor units 91A and 91B are connected in parallel to one outdoor unit 1, but the number of indoor units 91A and 91B may be three or more as long as there are a plurality of indoor units 91A and 91B. In the outdoor unit 1, a heat exchanger 2, a compressor 8 (a rotary compressor as an example), an accumulator 9, a four-way valve 92, and an expansion device (not shown) are arranged. The indoor units 91A and 91B are provided with expansion devices 94A and 94B (an expansion valve as an example) and indoor heat exchangers 95A and 95B, respectively.

  When the multi air conditioning system for buildings operates in the cooling mode, the refrigerant that has been brought into a high-temperature and high-pressure overheat state by the compressor 8 passes through the four-way valve 92 and reaches the heat exchanger 2 of the outdoor unit 1. The heat exchanger 2 acts as a condenser, and heat is released from the refrigerant to the air passing through the heat exchanger 2. In the heat exchanger 2, the refrigerant becomes a high-pressure supercooled refrigerant. Thereafter, the refrigerant is transported to the indoor units 91A and 91B through the refrigerant pipes 93A and 93B. The refrigerant is expanded in the expansion devices 94A and 94B, and enters a low-pressure and low-temperature gas-liquid two-phase state. Thereafter, the refrigerant reaches the indoor heat exchangers 95A and 95B. At this time, the indoor heat exchangers 95A and 95B act as evaporators, and cool the rooms 90A and 90B, respectively, by the heat absorbing action of the refrigerant. After the heat absorption, the refrigerant returns to the outdoor unit 1 through the refrigerant pipes 96A and 96B. The refrigerant passes through the four-way valve 92 and the accumulator 9, and then returns to the compressor 8 in a low-pressure gas phase.

  When the building multi-air conditioning system operates in the heating mode, the high-temperature and high-pressure refrigerant exits the compressor 8 and then passes through the four-way valve 92 and the refrigerant pipes 96A and 96B. Reach the indoor heat exchangers 95A and 95B. At this time, since the indoor heat exchangers 95A and 95B act as condensers, the refrigerant radiates heat to the ambient air. That is, the rooms 90A and 90B are heated. The high-pressure supercooled refrigerant exits the indoor heat exchangers 95A and 95B and then expands in the expansion devices 94A and 94B to be in a low-pressure and low-temperature gas-liquid two-phase state. Thereafter, the refrigerant returns to the outdoor unit 1 through the refrigerant pipes 93A and 93B. In the outdoor unit 1, the refrigerant passes through the four-way valve 92 and is then guided to the heat exchanger 2 of the outdoor unit 1. At this time, since the heat exchanger 2 acts as an evaporator, the refrigerant removes heat from the air passing through the heat exchanger 2. Thereafter, the gas passes through the four-way valve 92 and the accumulator 9 and returns to the compressor 8 in a low-pressure gas phase.

  Thus, even when the outdoor unit 1 of the present embodiment is used, a multi-air conditioning system for buildings can be configured by combining with the conventional type indoor units 91A and 91B. According to this embodiment, since the flow distribution of the air passing through the heat exchanger 2 can be optimized and the heat exchange efficiency in the heat exchanger 2 can be improved, the performance of the multi-air conditioning system for buildings is improved. can do.

  Specifically, in the case of cooling the inside of the rooms 90A and 90B, the heat radiation amount of the heat exchanger 2 of the outdoor unit 1 increases as the heat exchange efficiency in the heat exchanger 2 of the outdoor unit 1 increases. Further, the heat absorption amount of the indoor heat exchangers 95A and 95B of the indoor units 91A and 91B also increases. As a result, the cooling performance of the building multi-air conditioning system can be improved. On the other hand, when heating the inside of the rooms 90A and 90B, the heat absorption amount of the heat exchanger 2 of the outdoor unit 1 increases in the same manner as the heat exchange efficiency in the heat exchanger 2 of the outdoor unit 1 improves. Therefore, the heat radiation amount of the indoor heat exchangers 95A and 95B of the indoor units 91A and 91B increases. As a result, the heating performance of the building multi-air conditioning system can be improved.

(Second Embodiment)
Next, the outdoor unit 101 according to the second embodiment of the present invention will be described with reference to FIGS. 4A to 4C. In the outdoor unit 101 of the present embodiment, the shape of the rectifying body 105 is different from that of the rectifying body 5 of the first embodiment, and other configurations except for the rectifying body 5 are the same as those of the first embodiment. In the present embodiment, the same components as those of the first embodiment are denoted by reference numerals obtained by adding 100 to the reference numerals of the first embodiment, and description thereof is omitted.

  As shown in FIGS. 4A to 4C, the rectifier 105 further includes a cylindrical portion 105G that covers the side surface of the motor 104A. The cylindrical portion 105G is a cylindrical portion formed by the upper edge portion of the main body portion 105A protruding upward. The outer diameter of the bottom surface of the motor 104A is smaller than the outer diameter of the upper end portion of the main body portion 105A. The outer diameter of the cylindrical portion 105G is the same as the outer diameter of the upper end portion of the main body portion 105A. The inner diameter of the cylindrical portion 105G is larger than the outer diameter of the bottom surface of the motor 104A. For this reason, a second gap 105D is formed between the inner surface of the cylindrical portion 105G and the side surface of the motor 104A. The second gap 105D communicates with a first gap 105C formed between the upper end portion of the main body portion 105A and the bottom surface of the motor 4A. That is, the side surface of the cylindrical portion 105G covers the first gap 105C and the second gap 105D. The 1st flow path 111 is a flow path which flows the air attracted | sucked by the air blower 104 to the blower outlet 103 via the ventilation hole 105B, the 1st clearance gap 105C, and the 2nd clearance gap 105D. According to such a configuration, since the air flowing through the second gap 105D is brought closer to the side surface of the motor 104A, pressure loss due to separation of the boundary layer on the side surface of the motor 104A is reduced. In addition, since the air passing through the side surface of the motor 104A contacts the side surface of the motor 104A, the motor 104A can be cooled.

  Next, the operation of the rectifying body 105 will be described in comparison with the rectifying body 5 of the first embodiment. FIG. 5A shows a flow aspect of the outdoor unit 101 in the second embodiment, and FIG. 5B shows a flow aspect of the outdoor unit 1 in the first embodiment.

  In the first embodiment shown in FIG. 5B, the air sucked by the blower 4 passes through the first flow path 11 passing through the ventilation hole 5B and the first gap 5C of the rectifier 5, and further from the bottom surface of the motor 4A to the motor. It flows on the side of 4A. For this reason, on the side surface of the motor 4A, a vortex (a flow in the direction opposite to the air inflow direction) may occur due to the separation of the boundary layer, although it is slight compared to the conventional configuration.

  On the other hand, in the second embodiment shown in FIG. 5A, the air sucked by the blower 104 flows through the side surface of the motor 104A via the ventilation hole 105B, the first gap 105C, and the second gap 105D. For this reason, since the air flowing through the second gap 105D is brought closer to the side surface of the motor 104A by the cylindrical portion 105G, pressure loss due to separation of the boundary layer on the side surface of the motor 104A can be reduced. Therefore, compared to the first embodiment, it is possible to suppress the generation of eddy current due to separation of the boundary layer.

(Third embodiment)
Next, with reference to FIG. 6A, FIG. 6B, and FIG. 7, the outdoor unit 201 which concerns on 3rd Embodiment of this invention is demonstrated. In the outdoor unit 201 of this embodiment, the shape of the rectifying body 205 is different from that of the rectifying body 5 of the first embodiment, and the other configuration except for the rectifying body 5 is the same as that of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by reference numerals obtained by adding 200 to the reference numerals in the first embodiment, and description thereof is omitted.

  As shown in FIGS. 6A, 6B, and 7, the ventilation hole 205B of the rectifying body 205 has a direction parallel to the rotation axis of the motor 204A (up and down direction in FIG. 7) and a direction perpendicular to the rotation axis of the motor 204A (see FIG. 7 in the left-right direction). Ventilation hole 205B has a circular opening that opens at the center of the upper end of main body 205A, and a circular opening that opens at the center of the lower end of main body 205A. The diameter of the opening at the upper end of the main body 205A is larger than the diameter of the opening at the lower end of the main body 205A. That is, the shape of the rectifying body 205 is a funnel shape. A plurality of (for example, eight) convex portions 205H extending from the lower end portion of the rectifying body 205 toward the upper end portion are provided on the inner peripheral surface 205G of the ventilation hole 205B. The protrusions 205H are protrusions formed radially at equal intervals on the inner peripheral surface 205G of the ventilation hole 205B. According to such a configuration, the air sucked by the blower 204 can be easily guided to the side surface of the motor 204A, so that the motor 204A can be further cooled. Instead of the convex portion 205H, a plurality of grooves extending from the lower end portion of the rectifying body 205 toward the upper end portion may be provided on the inner peripheral surface 205G of the ventilation hole 205B.

  As shown in FIG. 7, in the third embodiment, the convex portion 205H makes it easy to guide the air sucked by the blower 204 to the side surface of the motor 204A. Therefore, the pressure loss due to the separation of the boundary layer on the side surface of the motor 204A. Can be reduced. Therefore, compared to the first embodiment, it is possible to suppress the generation of eddy current due to separation of the boundary layer.

1, 101, 201, 301 Outdoor unit 1A Housing 1B First side face 1C Second side face 1D Third side face 1E Fourth side face 2 Heat exchanger 2A First heat exchange section 2B Second heat exchange section 2C First 3 heat exchange part 3 blower outlet 3A bell mouth 4 blower 4A motor 5 rectifier 5A main body part 5B ventilation hole 5C first gap 5E upper end part 5F lower end part 6A first support member 6B second support member 6C third support member 6D first 4 support member 6E 5th support member 6F 6th support member 7 control box 7A inner side surface 8 compressor 9 accumulator 10 oil separator 11 first flow path 12 second flow path 20 internal space 30 flow rate distribution 40 atmospheric pressure 50 pressure distribution 50A Pressure distribution 50B Pressure distribution 90 Building 90A, 90B Room 91A, 91B Indoor unit 92 Four-way valve 93A, 93B Refrigerant piping 94A, 94B Expansion devices 95A, 95B Indoor heat exchangers 96A, 96B Refrigerant piping 105 Rectifier 105D Second gap 105G Cylindrical portion 205 Rectifier 205G Inner peripheral surface 205H Convex portion

Claims (7)

A housing having a side surface that is open to allow inflow of air;
A heat exchanger disposed in the housing along the side surface;
An air outlet provided in the upper part of the casing so as to blow out the air guided to the internal space of the casing through the heat exchanger toward the upper side of the casing;
A blower that is provided at an upper portion of the housing and sucks air from the internal space of the housing;
A motor provided at a lower portion of the blower and driving the blower;
A rectifier that covers the bottom surface of the motor on the side opposite to the side where the blower is located, and whose cross-sectional area decreases as the distance from the motor increases;
An air conditioner outdoor unit equipped with A first gap is formed between the rectifier and the bottom surface of the motor by disposing the rectifier at a position away from the bottom surface of the motor,
The rectifying body has a ventilation hole passing through an upper end portion of the rectifying body on a side facing the bottom surface of the motor and a lower end portion of the rectifying body on a side opposite to the side facing the bottom surface of the motor. Formed,
The internal space of the housing includes: (a) a first flow path for flowing the air sucked by the blower to the air outlet through the ventilation hole and the first gap; and (b) the rectifier. The outdoor unit for air conditioners of Claim 1 including the 2nd flow path which flows the said attracted | sucked air to the said blower outlet via the outer side. The rectifier has a cylindrical portion covering a side surface of the motor,
A second gap communicating with the first gap is formed between the inner side surface of the cylindrical portion and the side surface of the motor,
The air according to claim 2, wherein the first flow path is a flow path for flowing air sucked by the blower to the outlet through the ventilation hole, the first gap, and the second gap. The outdoor unit for a harmonic machine.   The whole of the bottom face of the motor is contained inside the rectifier when the motor and the rectifier are viewed in plan from a direction parallel to the rotation axis of the motor. An outdoor unit for an air conditioner described in 1.   The outdoor unit for an air conditioner according to any one of claims 1 to 4, wherein the rectifier is a member having a conical shape. The ventilation hole has an inner peripheral surface inclined with respect to both a direction parallel to the rotation axis of the motor and a direction perpendicular to the rotation axis of the motor,
A groove extending from the upper end toward the lower end is formed on the inner peripheral surface of the ventilation hole, or a convex portion extending from the upper end toward the lower end is provided. Item 4. The outdoor unit for an air conditioner according to Item 2 or 3. A motor support member for supporting the motor;
The outdoor unit for an air conditioner according to any one of claims 1 to 6, wherein the rectifier is fixed to the motor support member.

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