WO2017033756A1

WO2017033756A1 - Refrigeration device-use heat source unit

Info

Publication number: WO2017033756A1
Application number: PCT/JP2016/073656
Authority: WO
Inventors: 葉阿形; 西村　忠史
Original assignee: ダイキン工業株式会社
Priority date: 2015-08-21
Filing date: 2016-08-10
Publication date: 2017-03-02
Also published as: JP2017040460A; JP6094646B2; CN107923634B; CN107923634A

Abstract

Provided is a refrigeration device-use heat source unit configured so that, even if using a heat exchanger in which air is caused to pass through a plurality of surfaces thereof, the unit is capable of supplying different surfaces of the heat exchanger with cooling air obtained by water that is sprayed from at least one sprayer. The present invention is an outdoor unit (2) of an air conditioner (1), the outdoor unit (2) being provided with: an outdoor heat exchanger (14); an outdoor fan (15); a wind tunnel (8); and a two-fluid sprayer (6) that sprays water drops inside the wind tunnel (8). A rear surface-side extension section (80) of the wind tunnel (8) extends to the rear surface side of the outdoor heat exchanger (14). A front surface-side extension section (70) of the wind tunnel (8) is continuous at the front surface side of the rear surface-side extension section (80), and widens while securing gaps farther outside of parts which constitute left-right side surface parts of the outdoor heat exchanger (14).

Description

Refrigeration unit heat source unit

The present invention relates to a heat source unit of a refrigeration apparatus.

Conventionally, in order to increase the condensation efficiency and heat dissipation efficiency of the refrigerant flowing inside the heat exchanger, water sprayed on the air sent to the heat exchanger is included. Thereby, when the water is vaporized before reaching the heat exchanger, the temperature of the air supplied to the heat exchanger can be lowered by the amount of heat of vaporization.

Here, for example, in the example described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2013-76538), in a heat exchanger in which air is sent from a plurality of directions, a large number of the air flows in a corresponding direction. A nebulizer is provided.

In the example described in Patent Document 1 described above, since water is sprayed from a plurality of directions around the heat exchanger, it is possible to obtain a cooling effect on air fed into more surfaces of the heat exchanger. It is possible.

However, in the example described in Patent Document 1, since the sprayers are arranged in each of a plurality of directions around the heat exchanger, the number of sprayers is large and the cost is increased.

An object of the present invention is made in view of the above-described points, and is obtained by water sprayed from at least one sprayer even when a heat exchanger that allows air to pass through a plurality of surfaces is used. An object of the present invention is to provide a heat source unit of a refrigeration apparatus that can supply cooling air to different surfaces.

The heat source unit of the refrigeration apparatus according to the first aspect is a heat source unit of the refrigeration apparatus, and includes a heat exchanger, a fan, a wind tunnel, and a sprayer. The heat exchanger has at least a first heat exchange part that spreads on the first surface and a second heat exchange part that spreads on a second surface perpendicular to the first surface. The fan creates an air flow that passes through the heat exchanger. The wind tunnel has a first extending portion and a second extending portion that is continuous with the first extending portion. The first extending portion extends in a direction intersecting the first surface toward the windward side of the first heat exchange portion in the air flow. The second extending portion extends while securing a gap with the second heat exchanging portion on the windward side of the second heat exchanging portion in the air flow. The sprayer sprays water in the wind tunnel and on the windward side of the first heat exchange unit in the air flow. In addition, the number of this sprayer is not specifically limited, At least 1 is provided.

Here, the heat exchanger may be a heat exchanger spreading on only two sides of the first side and the second side, or a heat exchanger spreading on three sides, It may be a heat exchanger spread in

The wind tunnel extending in the direction intersecting the first surface is not limited to the wind tunnel extending linearly only in the direction intersecting the first surface. For example, the wind tunnel is curved so as to have a partially constricted portion. And a wind tunnel extending mainly in a direction intersecting the first surface.

In the heat source unit of the refrigeration apparatus, the water sprayed from the sprayer on the windward side of the first heat exchange unit is not only for the first heat exchange unit but also for the first orthogonal to the first surface of the first heat exchange unit. It becomes possible to supply also to the 2nd heat exchange part which spreads on two surfaces. Thereby, the cooling effect by the water sprayed on the windward side of the first heat exchange unit can be obtained by both the first heat exchange unit and the second heat exchange unit.

The heat source unit of the refrigeration apparatus according to the second aspect is the heat source unit of the refrigeration apparatus according to the first aspect, and the wind tunnel is a distance from the second heat exchange part to the second extension part in the normal direction of the second surface. However, it is shorter than the distance from the 1st heat exchange part in the normal line direction of a 1st surface to the windward side edge part of the airflow of a 1st extending | stretching part.

In the heat source unit of this refrigeration apparatus, the cooling effect by the water sprayed on the windward side of the first heat exchange unit is obtained by both the first heat exchange unit and the second heat exchange unit, and the wind of the second heat exchange unit By making the upper side compact, installation is possible even in a narrow installation space.

Moreover, since the 1st extending | stretching part is provided longer than the 2nd extending | stretching part about the windward side of the 1st heat exchange part in which water spraying is performed, the sprayed water is supplied to the 1st extending | stretching part of a wind tunnel. It becomes possible to more reliably capture the sprayed water that is difficult to escape to the outside and to obtain a cooling effect more reliably.

The heat source unit of the refrigeration apparatus according to the third aspect is the heat source unit of the refrigeration apparatus according to the second aspect, and the distance from the second heat exchange part to the second extension part in the normal direction of the second surface is 50 mm. That's it.

The distance from the second heat exchange part to the second extension part in the normal direction of the second surface is not particularly limited from the viewpoint of suppressing the sprayed water from diffusing outside the wind tunnel. , 250 mm or less.

In the heat source unit of the refrigeration apparatus, the water sprayed on the windward side of the first heat exchange unit is secured by securing a distance of 50 mm or more from the second heat exchange unit to the second extending unit in the normal direction of the second surface. Can be sufficiently supplied to the entire second heat exchanging part, and the air speed in the second heat exchanging part can be sufficiently secured, so that the second heat exchanging part also has sufficient heat exchange. Can be performed.

The heat source unit of the refrigeration apparatus according to the fourth aspect is a heat source unit of the refrigeration apparatus according to any one of the first to third aspects, and is a second with respect to the width of the first extending portion in the normal direction of the second surface. The ratio of the width of the first heat exchanging portion in the normal direction of the surface (the width of the first heat exchanging portion in the normal direction of the second surface / the width of the first extending portion in the normal direction of the second surface) is 0.5 or more and 0.9 or less.

In the heat source unit of this refrigeration apparatus, the cooling effect by the water sprayed on the windward side of the first heat exchange unit can be obtained more sufficiently in the second heat exchange unit.

The heat source unit of the refrigeration apparatus according to the fifth aspect is a heat source unit of the refrigeration apparatus according to any one of the first to fourth aspects, and in the gap space between the second heat exchange unit and the second extension unit. , Water is not sprayed.

In the heat source unit of the refrigeration apparatus, even when water is not sprayed between the second heat exchange unit and the second extension unit, the cooling effect by the water sprayed on the windward side of the first heat exchange unit is the first. It can be obtained by both the first heat exchange unit and the second heat exchange unit. Thereby, the sprayer which sprays water between a 2nd heat exchange part and a 2nd extending | stretching part is not provided (the spraying port in which water is sprayed is provided between the 2nd heat exchanging part and the 2nd extending | stretching part. Even if it is a case, the cooling effect by the sprayed water can be obtained by both the first heat exchange unit and the second heat exchange unit.

The heat source unit of the refrigeration apparatus according to the sixth aspect is a heat source unit of the refrigeration apparatus according to any of the first to fifth aspects, and the passage area of the air flow of the first heat exchange unit is the second heat exchange. It is wider than the passage area of the air flow of the part.

Here, when a plurality of second heat exchange units are provided, the air flow passage area of the first heat exchange unit is larger than that of the second heat exchange unit having the largest air flow passage area. Means.

In the heat source unit of this refrigeration apparatus, since the air cooling effect by the water sprayed in the first heat exchange section having a larger air flow passage area than the second heat exchange section can be obtained more reliably, desired energy saving can be achieved. An effect can be obtained more reliably.

The heat source unit of the refrigeration apparatus according to the seventh aspect is the heat source unit of the refrigeration apparatus according to any of the first to sixth aspects, and the heat exchanger further includes a third heat exchange unit. The third heat exchange part extends on the third surface facing the second surface while being orthogonal to the first surface. The wind tunnel further includes a third extending portion that is continuous with the first extending portion. The third extending portion extends while securing a gap with the third heat exchanging portion on the windward side of the third heat exchanging portion in the air flow.

In the heat source unit of the refrigeration apparatus, the water sprayed from the sprayer on the windward side of the first heat exchanging unit spreads not only the first heat exchanging unit and the second heat exchanging unit but also the first heat exchanging unit. It is also possible to supply to the third heat exchanging portion that spreads on the third surface orthogonal to the first surface. Thereby, the cooling effect by the water sprayed on the windward side of the first heat exchange unit can be obtained in any of the first heat exchange unit, the second heat exchange unit, and the third heat exchange unit.

In the heat source unit of the refrigeration apparatus according to the first aspect, the cooling effect by the water sprayed on the windward side of the first heat exchange unit can be obtained by both the first heat exchange unit and the second heat exchange unit. Become.

The heat source unit of the refrigeration apparatus according to the second aspect can be installed even in a narrow installation space while obtaining a cooling effect in both the first heat exchange unit and the second heat exchange unit.

In the heat source unit of the refrigeration apparatus according to the third aspect, the water sprayed on the windward side of the first heat exchange unit can be more sufficiently supplied to the entire second heat exchange unit, and the first It becomes easy to sufficiently secure the wind speed in the two heat exchanging units, and it is possible to cause the second heat exchanging units to sufficiently perform the heat exchange.

In the heat source unit of the refrigeration apparatus according to the fourth aspect, the cooling effect by the water sprayed on the windward side of the first heat exchange unit can be more sufficiently obtained also in the second heat exchange unit.

In the heat source unit of the refrigeration apparatus according to the fifth aspect, even when a sprayer that sprays water is not provided between the second heat exchange unit and the second extension unit, the cooling effect by the sprayed water is reduced. It can be obtained by both the first heat exchange unit and the second heat exchange unit.

In the heat source unit of the refrigeration apparatus according to the sixth aspect, a desired energy saving effect can be obtained more reliably.

In the heat source unit of the refrigeration apparatus according to the seventh aspect, the cooling effect by the water sprayed on the windward side of the first heat exchange unit is determined in any of the first heat exchange unit, the second heat exchange unit, and the third heat exchange unit. Can also be obtained.

It is a schematic block diagram including the refrigerant circuit of an air conditioning apparatus. It is a schematic perspective view including the front side of an outdoor unit (excluding a wind tunnel). It is a schematic side view of an outdoor unit. It is a schematic plan view of an outdoor unit. It is sectional drawing of a two-fluid sprayer. It is sectional drawing of the nozzle of a two-fluid sprayer. The upper diagram is a cross-sectional view along AA in FIG. 6, and the lower diagram is a cross-sectional view along BB in FIG. It is a top view of the outdoor unit provided with the wind tunnel of a comparison object. It is a front view of the outdoor unit provided with the wind tunnel of a comparison object. It is a side view of the outdoor unit provided with the wind tunnel of a comparison object. It is a figure which shows the simulation result of the mode of distribution of a cooling effect. It is a figure which shows the simulation result of the mode of the distribution of the cooling effect at the time of seeing from the different angle about the same content as FIG.

Hereinafter, one embodiment will be described as an example, but the present invention is not limited to this.

(1) Configuration of Air Conditioner FIG. 1 shows a refrigerant circuit 10 and the like of an air conditioner 1 including an outdoor unit 2 according to an embodiment of the present invention.

The air conditioner 1 is a multi-type air conditioner for buildings, and is configured by connecting an indoor unit 3 as a plurality of utilization units in parallel to an outdoor unit 2 as one or a plurality of heat source units. Has been.

The refrigerant circuit 10 of the air conditioner 1 is mainly composed of a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 14, an outdoor expansion valve 16, an indoor expansion valve 17, and an indoor heat exchanger 18 connected in order. Yes, it is a vapor compression refrigeration cycle. The refrigerant circuit 10 can be switched between the cooling operation and the heating operation by switching the connection state of the four-way switching valve 12.

The compressor 11, the four-way switching valve 12, the outdoor heat exchanger 14, and the outdoor expansion valve 16 are included in the outdoor unit 2. The outdoor unit 2 is provided with an accumulator 13 between the suction side of the compressor 11 and the four-way switching valve 12. The outdoor unit 2 is provided with an outdoor fan 15 that applies air to the outdoor heat exchanger 14 to promote heat exchange between the refrigerant and the air. Further, the compressor 11 is not particularly limited, but includes a variable capacity compressor (inverter compressor) that performs rotation speed control by an inverter and a constant capacity compressor (constant capacity compressor) that performs on / off control. It may be combined.

The indoor expansion valve 17 and the indoor heat exchanger 18 are included in the indoor unit 3. The indoor unit 3 is provided with an indoor fan 19 that applies air to the indoor heat exchanger 18 to promote heat exchange between the refrigerant and the air.

Further, the four-way switching valve 12 and the indoor heat exchanger 18 are connected by a gas side refrigerant communication pipe 5. The outdoor expansion valve 16 and the indoor expansion valve 17 are connected by a liquid side refrigerant communication pipe 4. The liquid side refrigerant communication pipe 4 and the gas side refrigerant communication pipe 5 are disposed between the outdoor unit 2 and the indoor unit 3. Further, in the outdoor unit 2, in addition to those described above, accessory devices are also provided, but are not illustrated here.

A gas side closing valve 20b and a liquid side closing valve 20a are provided at the end of the internal refrigerant circuit of the outdoor unit 2. The gas side shut-off valve 20b is disposed on the four-way switching valve 12 side, and the gas side refrigerant communication pipe 5 is connected thereto. The liquid side closing valve 20a is disposed on the outdoor expansion valve 16 side, and the liquid side refrigerant communication pipe 4 is connected thereto. The gas side shutoff valve 20b and the liquid side shutoff valve 20a are closed when the outdoor unit 2 and the indoor unit 3 are installed. The gas-side shutoff valve 20b and the liquid-side shutoff valve 20a are configured such that the outdoor unit 2 and the indoor unit 3 are installed on the site, and the gas-side refrigerant communication pipe 5 and the liquid-side refrigerant communication pipe 4 are closed with the gas-side shutoff valve 20b. After being connected to the valve 20a, the valve is opened.

The outdoor unit 2 is provided with a two-fluid sprayer 6 for cooling the air sent to the outdoor heat exchanger 14 in order to increase the condensation efficiency of the refrigerant in the outdoor heat exchanger 14. In the present embodiment, a plurality of the two-fluid sprayers 6 (seven: the first two-fluid sprayers 6a to the sixth two-fluid sprayers 6g) are provided, but the number of the two-fluid sprayers 6 is not particularly limited. It may be. The two-fluid sprayer 6 sprays a mixture of air and water. The two-fluid sprayer 6 is disposed at a position on the windward side of the outdoor heat exchanger 14 and surrounded by a wind tunnel 8 described later in the air flow formed by the outdoor fan 15. Although not particularly limited, in the present embodiment, the two-fluid sprayer 6 is configured to spray water droplets radially toward the side opposite to the outdoor heat exchanger 14 side. Water droplets sprayed radially from the two-fluid sprayer 6 toward the side opposite to the outdoor heat exchanger 14 side in the wind tunnel 8 are gradually diffused to the outdoor heat exchanger 14 side by the air flow generated by the outdoor fan 15 while being diffused. The flow is changed so that substantially all water droplets are vaporized before reaching the outdoor heat exchanger 14. Thereby, the air sent to the outdoor heat exchanger 14 can be cooled, and the condensation efficiency of the refrigerant | coolant in the outdoor heat exchanger 14 can be improved. In addition, since it is comprised so that the water droplet sprayed from the two-fluid sprayer 6 may vaporize substantially all before reaching the outdoor heat exchanger 14, in the outdoor heat exchanger 14 mainly comprised with the metal. Corrosion can be suppressed.

The water to be sprayed is supplied to the two-fluid sprayer 6 from the water supply source 95 through the liquid feed pipe 93. A liquid feed pump 94 is provided in the middle of the liquid feed pipe 93 so that the amount of water flowing through the liquid feed pipe 93 can be adjusted. In addition, although illustration is abbreviate | omitted, the branched liquid feeding piping 93 is connected with respect to each of the seven two fluid sprayers 6 of this embodiment.

Further, the air for mixing with the water to be sprayed is supplied to the two-fluid sprayer 6 through the air supply pipe 91. A pneumatic pump 92 such as a compressor is provided in the middle of the pneumatic pipeline 91 so that the amount of air flowing through the pneumatic pipeline 91 can be adjusted. In addition, although illustration is abbreviate | omitted, the branched air supply piping 91 is connected with respect to each of the seven two fluid sprayers 6 of this embodiment.

Although details will be described later, in the two-fluid sprayer 6, the water sent via the liquid feed pipe 93 and the air sent via the air feed pipe 91 are mixed in the gas-liquid mixing unit 61, The obtained gas-liquid mixed water is sprayed from the nozzle 62.

The air conditioner 1 has a control unit 98 that performs various controls. The control unit 98 includes an indoor control unit 96 provided in the indoor unit 3 and an outdoor control unit 97 provided in the outdoor unit 2. The indoor control unit 96 and the outdoor control unit 97 each have a ROM, a RAM, a CPU, and the like. The control unit 98 controls the frequency of the compressor 11, the switching control of the four-way switching valve 12, the air volume control of the outdoor fan 15, the valve opening control of the outdoor expansion valve 16, the valve opening control of the indoor expansion valve 17, and the indoor fan. 19 air volume control, liquid feed pump 94 output control, air feed pump 92 output control, and the like.

(2) Operation of Air Conditioner Next, the operation of the air conditioner 1 will be described.

During the cooling operation, the four-way switching valve 12 is maintained in the state indicated by the solid line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 14 through the four-way switching valve 12, and is condensed and liquefied by exchanging heat with outdoor air. In the cooling operation, water is sprayed from the two-fluid sprayer 6 to cool the air flowing toward the outdoor heat exchanger 14 and improve the condensation efficiency of the refrigerant in the outdoor heat exchanger 14. The spray of water from the two-fluid sprayer 6 here may be executed when a predetermined load level is exceeded during the cooling operation. In this case, for example, the liquid feed pump 94 and the air feed pump 92 are controlled so that water is sprayed continuously or intermittently from each of the two fluid sprayers 6 for a predetermined time. The refrigerant liquefied in the outdoor heat exchanger 14 passes through the fully opened outdoor expansion valve 16 and flows into the indoor units 3 through the liquid side refrigerant communication pipe 4. In the indoor unit 3, the refrigerant is depressurized to a predetermined low pressure by the indoor expansion valve 17, and is further evaporated by exchanging heat with indoor air in the indoor heat exchanger 18. The indoor air cooled by the evaporation of the refrigerant is blown out into the room by the indoor fan 19 to cool the room. The refrigerant evaporated and vaporized in the indoor heat exchanger 18 returns to the outdoor unit 2 through the gas side refrigerant communication pipe 5, passes through the four-way switching valve 12 and the accumulator 13, and then is sucked into the compressor 11. .

During the heating operation, the four-way switching valve 12 is held in a state indicated by a broken line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 18 of each indoor unit 3 via the four-way switching valve 12, and exchanges heat with indoor air to condense and liquefy. The indoor air heated by the condensation of the refrigerant is blown into the room by the indoor fan 19 to heat the room. The refrigerant liquefied in the indoor heat exchanger 18 returns from the fully expanded indoor expansion valve 17 to the outdoor unit 2 through the liquid side refrigerant communication pipe 4. The refrigerant that has returned to the outdoor unit 2 is decompressed to a predetermined low pressure by the outdoor expansion valve 16, and further evaporates by exchanging heat with outdoor air by the outdoor heat exchanger 14. Here, the spraying of water from the two-fluid sprayer 6 performed during the cooling operation is not performed during the heating operation. The refrigerant evaporated and evaporated in the outdoor heat exchanger 14 is sucked into the compressor 11 through the four-way switching valve 12 and the accumulator 13.

(3) Detailed Configuration of Outdoor Unit Next, the outdoor unit 2 will be described in detail with reference to FIGS.

FIG. 2 is a schematic perspective view including the front side of the outdoor unit 2 (excluding the wind tunnel). FIG. 3 is a schematic side view of the outdoor unit 2. FIG. 4 is a schematic plan view of the outdoor unit 2.

The outdoor unit 2 has an outdoor unit casing 30 that accommodates an outdoor heat exchanger 14, an outdoor fan 15, a compressor 11, an accumulator 13, and an outdoor expansion valve 16.

The outdoor unit casing 30 has a substantially rectangular parallelepiped shape, and includes a first support 31a, a second support 31b, a third support 31c, a fourth support 31d, a reinforcing member 31x, a front base leg 36a, a back base leg 36b, and a front upper panel 32a. A front left lower panel 32b, a right panel 33, a back panel 34, a left upper panel 35a, a left front lower panel 35b, an upper outlet 15a, a bottom frame 37, and the like.

The support column includes a first support column 31a extending in the vertical direction on the right side of the front surface, a second support column 31b extending in the vertical direction on the right side of the rear surface, a third support column 31c extending in the vertical direction on the left side of the rear surface, and a first support column extending in the vertical direction on the left side of the front surface. 4 columns 31d.

The reinforcing member 31x is provided so as to connect the first support post 31a and the second support post 31b at a plurality of positions at an intermediate height, thereby increasing the strength of the outdoor unit casing 30.

The front base leg 36 a extends to the left and right at the front side lower end of the outdoor unit casing 30. The back base leg 36 b extends to the left and right at the back side lower end portion of the outdoor unit casing 30.

The front upper panel 32 a covers the front side of the outdoor fan 15 above the front surface of the outdoor unit casing 30. The front left lower panel 32 b extends so as to cover the lower left front of the outdoor unit casing 30. The right panel 33 is provided so as to cover the right side of the outdoor fan 15 above the right side surface of the outdoor unit casing 30. The back panel 34 is provided so as to cover the back side of the outdoor fan 15 above the back of the outdoor unit casing 30. The left upper panel 35 a is provided above the left side surface of the outdoor unit casing 30 so as to cover the left side of the outdoor fan 15. The left front lower panel 35 b extends so as to cover the lower front side of the left side surface of the outdoor unit casing 30. The upper air outlet 15a is an opening provided so as to penetrate in the vertical direction on the upper surface of the outdoor unit casing 30, and sends the air flow F generated by the outdoor fan 15 vertically upward. The bottom frame 37 is fixed to the columns 31a to 31d in the vicinity of the lower ends of the columns 31a to 31d and spreads on a plane.

The outdoor fan 15 is disposed above the outdoor unit casing 30 and downstream of the outdoor heat exchanger 14 (downward side). Although it does not specifically limit as the outdoor fan 15, For example, an axial blower, a centrifugal blower, a mixed flow blower, etc. can be used. Two units are provided so as to be arranged in parallel in the longitudinal direction of the outdoor unit casing 30 in a top view. The outdoor fans 15 are provided such that their rotation axes are directed vertically upward. Around each of the plurality of outdoor fans 15, a bell mouth 15b extending in a cylindrical shape in the vertical direction is provided. The wind speed immediately before the center of the fifth heat exchange portion 14e of the outdoor heat exchanger 14 of the air flow generated by the outdoor fan 15 is preferably operated in the range of 0.5 m / s to 2.0 m / s. It is more preferable to operate in the range of not less than 0.8 m / s and not more than 1.7 m / s.

The outdoor heat exchanger 14 is not particularly limited, and examples thereof include a cross fin coil heat exchanger. The cross fin coil heat exchanger includes a heat transfer tube and a large number of plate fins through which the heat transfer tube penetrates. A refrigerant flows through the heat transfer tube, and outside air flows between the plate fins. Note that the heat transfer tubes and plate fins of the outdoor heat exchanger 14 are made of metal such as aluminum, aluminum alloy, copper, copper alloy, or the like. The outdoor heat exchanger 14 is provided along the four side surfaces of the outdoor unit casing 30 and is erected so as to extend upward with respect to the installation surface (horizontal plane) of the outdoor unit 2. As shown in FIG. 4, the outdoor heat exchanger 14 has a first heat exchange portion 14 a that spreads on the right side of the front surface and a second heat exchange portion that is curved so as to connect the front surface and the right side surface. 14b, the third heat exchange part 14c spreading on the right side, the fourth heat exchange part 14d curved so as to connect the right side and the back, the fifth heat exchange part 14e spreading on the back, and the back and the left side And the seventh heat exchange portion 14g spreading on the back side of the left side surface, and these are connected to each other so that the side surface of the outdoor unit casing 30 is edged. It is provided to take. In the present embodiment, the portion of the outdoor heat exchanger 14 having the largest air passage area is the fifth heat exchange portion 14e, and the air passage area of the third heat exchange portion 14c and the seventh heat exchange portion 14g. It is comprised so that it may become larger than an air passage area. In addition, the air passage area of the third heat exchange portion 14c is configured to be larger than the air passage area of the seventh heat exchange portion 14g. The outdoor air taken in through the portion of the outdoor unit casing 30 that opens facing each other passes through each heat exchange portion of the outdoor heat exchanger 14.

Here, the 2nd heat exchange part 14b, the 3rd heat exchange part 14c, the 4th heat exchange part 14d, and the 5th heat exchange which comprise the left side, the right side, and the back side among the outdoor heat exchangers 14 are carried out. Outside air passing through the inside of the wind tunnel 8 described later is sent to the portion 14e, the sixth heat exchange portion 14f, and the seventh heat exchange portion 14g. And as will be described later, the second heat exchange part 14b, the third heat exchange part 14c, the fourth heat exchange part 14d, the fifth heat exchange part 14e, the sixth heat exchange part 14f of the outdoor heat exchanger 14, Air cooled by the transpiration of water droplets sprayed from the two-fluid sprayer 6 disposed inside the wind tunnel 8 is supplied to the seventh heat exchange portion 14g.

When the air conditioner 1 is in operation, the refrigerant circulates between the outdoor unit 2 and the plurality of indoor units 3 by operating the compressor 11. Here, the outdoor fan 15 rotates when a fan motor (not shown) is operated, and the outside air is sucked into the inside from the lower periphery of the outdoor unit casing 30. Here, the 2nd heat exchange part 14b, the 3rd heat exchange part 14c, the 4th heat exchange part 14d, and the 5th heat exchange which comprise the left side, the right side, and the back side among the outdoor heat exchangers 14 are carried out. Cooled air is sent to the portion 14e, the sixth heat exchange portion 14f, and the seventh heat exchange portion 14g as the water droplets sprayed from the two-fluid sprayer 6 evaporate. The air passing through the outdoor heat exchanger 14 exchanges heat with the refrigerant flowing inside the outdoor heat exchanger 14, and then blows out upward of the outdoor unit casing 30 through the upper outlet 15a.

(4) Detailed configuration of two-fluid sprayer and its surroundings In the present embodiment, there are a plurality of (two: seven: first two-fluid sprayer 6a, second two-fluid sprayer 6b, third two-fluid sprayer 6c, fourth A two-fluid sprayer 6d, a fifth two-fluid sprayer 6e, a sixth two-fluid sprayer 6f, and a seventh two-fluid sprayer 6g), which are arranged as shown in FIGS.

Each of the two-fluid sprayers 6 is located upstream of the outdoor heat exchanger 14 in the direction of the air flow F formed when the outdoor fan 15 is driven. Although not particularly limited, in the present embodiment, the plurality of two-fluid sprayers 6 are inside the wind tunnel 8 and on the back side (windward side) of the fifth heat exchange portion 14e of the outdoor heat exchanger 14. It is arranged on the same passage surface. Here, each two-fluid sprayer 6 is arrange | positioned at predetermined intervals in the left-right direction. Among the two-fluid sprayer 6, the first two-fluid sprayer 6a, the fourth two-fluid sprayer 6d, and the seventh two-fluid sprayer 6g are located near the center in the height direction of the fifth heat exchange portion 14e of the outdoor heat exchanger 14. It is arranged at the height position. The first two-fluid sprayer 6a is disposed at a position closest to the rear-side left side surface portion 84 of the wind tunnel 8 described later among the plurality of two-fluid sprayers 6. The 7th 2 fluid sprayer 6g is arrange | positioned in the position nearest to the back side right side surface part 83 of the wind tunnel 8 mentioned later among the some 2 fluid sprayers 6. FIG. The 4th 2 fluid sprayer 6d is arrange | positioned in the center vicinity in the left-right direction. The 2nd 2 fluid sprayer 6b and the 3rd 2 fluid sprayer 6c are arrange | positioned between the 1st 2 fluid sprayer 6a and the 4th 2 fluid sprayer 6d in the left-right direction. The second two-fluid sprayer 6b is disposed at a position higher than the height position of the first two-fluid sprayer 6a and the like, and the third two-fluid sprayer 6c is higher than the height position of the first two-fluid sprayer 6a and the like. Located in a low position. The fifth two-fluid sprayer 6e and the sixth two-fluid sprayer 6f are disposed between the fourth two-fluid sprayer 6d and the seventh second-fluid sprayer 6g in the left-right direction. The fifth two-fluid sprayer 6e is disposed at a position higher than the height position of the seventh second-fluid sprayer 6g and the like, and the sixth two-fluid sprayer 6f is higher than the height position of the seventh second-fluid sprayer 6g and the like. Located in a low position.

FIG. 5 is a cross-sectional view showing the two-fluid sprayer 6. FIG. 6 is a sectional view showing the nozzle 62 of the two-fluid sprayer 6. The central axis C is indicated by a dotted line.

As shown in FIG. 5, the two-fluid sprayer 6 includes a gas-liquid mixing unit 61 constituted by a first mixing body 55 and a second mixing body 56, and a nozzle 62. The 1st mixing body 55, the 2nd mixing body 56, and the nozzle 62 are arrange | positioned so that a gas-liquid mixed water may flow in a line, and are mutually connected. The nozzle 62 is supported by a support member 57 as shown in FIG. 5, for example, and the support member 57 is fastened and fixed to the first mixing body 55 by, for example, a bolt (not shown). In the present embodiment, the first mixing body 55 and the second mixing body 56 are used as separate members, but they may be formed integrally.

In the first mixing body 55, the liquid flow path 51 connected to the liquid feed pipe 93, the gas flow path 52 connected to the air feed pipe 91, the water flowing through the liquid flow path 51, and the gas flow path 52 flow. And a gas-liquid mixing channel 53 for mixing air. The gas-liquid mixed water generated in the gas-liquid mixing channel 53 is sent to the nozzle 62 via the communication channel 54 extending in the axial direction in the second mixing body 56. The inner diameters of the gas-liquid mixing channel 53 and the communication channel 54 are larger than the inner diameter of the upstream small-diameter channel 58 of the nozzle 62 described later, and the inner diameter of the communication channel 54 is larger than the inner diameter of the gas-liquid mixing channel 53. .

7 is a cross-sectional view taken along the line AA in FIG. 6, and the lower view of FIG. 7 is a cross-sectional view taken along the line BB in FIG. The central axis C is indicated by a dotted line.

The nozzle 62 has an inlet 58a, an upstream small-diameter channel 58, a downstream large-diameter channel 59, and one or a plurality of ejection holes 68. The inflow port 58 a is an opening at the upstream end for guiding the gas-liquid mixed water generated in the gas-liquid mixing unit 61 into the nozzle 62. The ejection hole 68 is a hole through which the gas-liquid mixed water is ejected from the nozzle 62. The upstream small diameter flow path 58 and the downstream large diameter flow path 59 constitute a flow path from the inlet 58 a to the ejection hole 68 in the nozzle 62. The upstream small-diameter channel 58 is a channel directly connected to the non-tip portion 63 of the downstream large-diameter channel 59.

The nozzle 62 includes a body in which an upstream small-diameter channel 58, a downstream large-diameter channel 59, and an ejection hole 68 are formed. In the present embodiment, the body of the nozzle 62 includes a first nozzle body 62a and a second nozzle body 62b. The downstream end of the first nozzle body 62a is fitted in a recess provided on the upstream side of the second nozzle body 62b, and the first nozzle body 62a and the second nozzle body 62b are integrated.

The upstream small-diameter channel 58 is defined by an inner peripheral surface of a through hole provided in the first nozzle body 62a of the nozzle 62, and is a portion having a constant inner diameter. The upstream small-diameter channel 58 is a portion having an inner diameter smaller than that of the non-tip portion 63 of the downstream large-diameter channel 59 described later. As described above, the upstream small-diameter channel 58 extends in parallel with the axial direction of the nozzle 62 while maintaining a constant inner diameter, and is a portion having a smaller inner diameter than the non-tip portion 63 of the downstream large-diameter channel 59. Compared to when flowing through the mixing portion 61, in the upstream small-diameter channel 58, the flow rate of the gas-liquid mixed water is increased and the flow mode is more stable.

The downstream large-diameter channel 59 is partitioned by the outlet side end surface of the first nozzle body 62a of the nozzle 62, the inner peripheral surface 64 of the recess provided in the second nozzle body 62b of the nozzle 62, and the tip surface 66 of the recess. ing. The downstream large-diameter channel 59 has a large-diameter upstream portion 59a whose inner diameter is constant in the axial direction, and a large-diameter downstream portion 59b that decreases in diameter toward the distal end side (the ejection hole 68 side).

The tip surface 66 is a surface on which the gas-liquid mixed water that has flowed into the downstream large-diameter channel 59 collides with the tip side of the downstream large-diameter channel 59 as indicated by a dashed-dotted curve arrow in FIG. The tip surface 66 is a surface extending in a direction intersecting with the axial direction of the nozzle 62 (the central axis C of the upstream small diameter flow path 58). The tip surface 66 of the nozzle 62 includes a tapered surface 66a that tapers toward the tip, and a flat surface 66b connected to the tip of the tapered surface 66a. The plane 66b is provided at the position of the tip of the downstream large-diameter channel 59 so as to block the circular tip of the tapered surface 66a, and is orthogonal to the axial direction of the nozzle 62 (the central axis C of the upstream small-diameter channel 58). It is the surface that extends in the direction to do.

The ejection hole 68 is provided in the tapered surface 66a in the vicinity of the boundary between the tapered surface 66a and the flat surface 66b.

The downstream large-diameter channel 59 includes a non-tip portion 63 having an inner diameter larger than the inner diameter of the upstream small-diameter channel 58. Further, the tip portion 65 is a portion on the tip side in the axial direction from the circle indicated by the dotted line in the lower diagram of FIG. 7, and is equal to or less than the inner diameter of the upstream small-diameter channel 58. The non-tip portion 63 is constituted by the whole large-diameter upstream portion 59a and a part of the large-diameter downstream portion 59b, and the tip portion 65 is the remaining portion of the large-diameter downstream portion 59b (that is, the tip portion of the large-diameter downstream portion 59b). ). Therefore, the gas-liquid mixed water that has flowed out of the upstream small-diameter channel 58 first flows into the non-tip portion 63, flows toward the tip surface 66 while spreading outward in the radial direction at the non-tip portion 63, and urges the tip surface 66. It collides well, and, due to the impact at this time, it violently flows, for example, in a spiral shape in the downstream large-diameter channel 59 (mainly the non-tip portion 63). Thereby, since a large air mass in water is decomposed into a large number of fine bubbles in the downstream large-diameter channel 59, the gas-liquid mixed water in the downstream large-diameter channel 59 is, for example, a bubble flow or a fluid state close thereto. Become.

The ejection hole 68 is constituted by a through hole that communicates the downstream large-diameter channel 59 and the outside of the nozzle 62 (outside of the two-fluid sprayer 6) at the tip of the nozzle 62.

Next, the relationship between the length and inner diameter of the upstream small-diameter channel 58 of the nozzle 62 and the length and inner diameter of the downstream large-diameter channel 59 will be described.

As shown in FIG. 6, the length L1 in the axial direction of the upstream small-diameter channel 58 is larger than the length L2 in the axial direction of the downstream large-diameter channel 59, and the length L1 of the upstream small-diameter channel 58 and the downstream large-diameter flow The ratio of the length L2 of the path 59 (L1 / L2) is preferably larger than 1.0 and smaller than 4.5. Thereby, the water droplet atomized by the average particle diameter of 60 micrometers or less can be sprayed. Further, from the viewpoint of further reducing the average particle diameter, the length ratio (L1 / L2) is preferably in the range of 1.27 or more and 3.45 or less. The ratio (D2 / D1) between the maximum value D2 of the inner diameter of the non-tip portion 63 and the maximum value D1 of the inner diameter of the upstream small diameter channel 58 can be made larger than 1.1 and smaller than 20, for example 1.5. More preferably, it is in the range of 10.7 or less. Although not particularly limited, for example, the length L1 of the upstream small-diameter channel 58 is set to a range of 5.0 mm to 38.8 mm, and the length L2 of the downstream large-diameter channel 59 is set to a range of 2.9 mm to 12.9 mm. The maximum value D1 of the inner diameter of the small-diameter channel 58 is preferably in the range of 0.6 mm to 2.0 mm, and the maximum value D2 of the inner diameter of the downstream large-diameter channel 59 is preferably in the range of 3.0 mm to 6.4 mm. In addition, it is preferable that the minimum of the internal diameter of the ejection hole 68 is 0.4 mm or more, and it is more preferable that it is 0.6 mm or more. The upper limit of the inner diameter of the ejection hole 68 is preferably 2.0 mm or less, and more preferably 1.6 mm or less.

The flow rate of water flowing into the two-fluid sprayer 6 is preferably 0.020 L / min to 2.0 L / min, and can be, for example, in the range of 0.040 L / min to 0.080 L / min.

The flow rate of air flowing into the two-fluid sprayer 6 is preferably 1.0 L / min or more and 50 L / min or less, and can be, for example, in the range of 3 L / min to 13 L / min.

The lower limit of the spray pressure of the two-fluid sprayer 6 is preferably 0.03 MPa or more and 0.5 MPa or less, and can be, for example, in the range of 0.04 MPa to 0.19 MPa.

Regarding the above-described two-fluid sprayer 6, when the liquid feed pump 94 and the air feed pump 92 are operated, water is supplied to the gas-liquid mixing unit 61 of the two-fluid sprayer 6 through the liquid feed pipe 93 and the air feed is also performed. Gas (air) is supplied to the gas-liquid mixing unit 61 through the pipe 91. As a result, gas-liquid mixed water is generated in the gas-liquid mixing unit 61. The generated gas-liquid mixed water is guided to the nozzle 62.

The gas-liquid mixed water guided to the nozzle 62 is increased in flow velocity in the upstream small-diameter channel 58, and the flow mode is changed to, for example, an annular flow or a flow mode close thereto, and flows into the downstream large-diameter channel 59. The gas-liquid mixed water that has flowed into the downstream large-diameter channel 59 flows toward the tip surface 66 while spreading radially outward at the non-tip portion 63, and collides with the tip surface 66 while the flow velocity does not decrease so much. To do. Due to the impact at this time, the gas-liquid mixed water flows vigorously in a spiral shape in the downstream large-diameter channel 59. Thereby, since a large air mass in water is decomposed into a large number of fine bubbles in the downstream large-diameter channel 59, the gas-liquid mixed water in the downstream large-diameter channel 59 is, for example, a bubble flow or a fluid state close thereto. Become.

Thus, immediately before jetting from the jet hole 68 of the nozzle 62, gas-liquid mixed water in which a large number of fine bubbles are dispersed can be stably formed in the downstream large-diameter channel 59. The gas-liquid mixed water that has reached the ejection hole 68 contains a large number of fine bubbles, and is sprayed to the outside of the two-fluid sprayer 6 together with these bubbles. When water containing a large number of bubbles is sprayed from the ejection holes 68 or after being sprayed from the ejection holes 68, the bubbles expand and repel, thereby making the water droplets finer.

As described above, the two-fluid sprayer 6 can spray fine water droplets having an SMD (Sauter average particle diameter) of 30 μm or more and 60 μm. By spraying the water droplets thus refined, substantially all (for example, 70% by mass or more) can be evaporated before the sprayed water droplets reach the outdoor heat exchanger 14, and the outdoor heat The air sent to the exchanger 14 can be cooled, and corrosion in the outdoor heat exchanger 14 can be made difficult to occur.

(5) Wind tunnel The outdoor unit 2 of the present embodiment includes a second heat exchange part 14b, a third heat exchange part 14c, a second heat exchange part 14c, and a second heat exchange part 14c that constitute the left side, right side, and back side of the outdoor heat exchanger 14. A wind tunnel 8 extending mainly on the back side of the outdoor unit 2 is provided so as to guide outside air to the fourth heat exchange part 14d, the fifth heat exchange part 14e, the sixth heat exchange part 14f, and the seventh heat exchange part 14g. ing. In the wind tunnel 8, the two-fluid sprayer 6 a is arranged as described above, and water droplets are sprayed on the windward side of the air flow with respect to the outdoor heat exchanger 14, and the water droplets evaporate, thereby the outdoor heat. For the second heat exchange part 14b, the third heat exchange part 14c, the fourth heat exchange part 14d, the fifth heat exchange part 14e, the sixth heat exchange part 14f, and the seventh heat exchange part 14g of the exchanger 14. Can supply cooled air.

The wind tunnel 8 is continuous with the back-side extending portion 80 and the back-side extending portion 80 that constitute a portion of the outdoor unit casing 30 on the back side (the back side with respect to the back panel 34, the second column 31b, and the third column 31c). And a front side extending portion 70 that mainly covers the left and right side surfaces of the outdoor unit casing 30 on the front side of the rear side extending portion 80.

The back-side extending portion 80 has a square cylindrical shape extending in the front-rear direction, and includes a back-side top surface portion 81, a back-side bottom surface portion 82, a back-side right-side surface portion 83, and a back-side left-side surface portion 84. ,have.

The back side upper surface portion 81 extends from the lower side of the back panel 34 toward the back side from the left side of the second column 31b to the right side of the third column 31c. It constitutes a plane whose normal direction is the vertical direction. The back-side upper surface portion 81 has a substantially rectangular shape in plan view.

The back side bottom surface part 82 faces the back side top surface part 81, and from the vicinity of the back base leg 36b to the back side from the left side further than the second column 31b to the right side than the third column 31c. It extends so as to extend toward the surface, and constitutes a surface whose normal direction is the vertical direction. The back side bottom surface portion 82 has a substantially rectangular shape in plan view.

The back side right side surface part 83 spreads so as to connect the right side edge part of the back side top surface part 81 and the right side edge part of the back side bottom surface part 82 in the vertical direction, and the normal direction is a surface in the horizontal direction. The back side right side surface portion 83 extends from the vicinity of the left end of the second support column 31b to the back side.

The back side left side 84 faces the back side right side 83 and extends so as to connect the left end of the back side top 81 and the left end of the back side 82 in the vertical direction. It is a surface in which the line direction is the horizontal direction. The back side left side 84 extends from the vicinity of the right end of the third support column 31c to the back side.

The front side extending part 70 includes a right front side extending part 70a continuous with the back side extended part 80 on the right front side, and a left front side extending part 70b continuous with the back side extended part 80 on the left front side. Have.

The right front side extending portion 70a has a right front side upper surface portion 71, a right front side bottom surface portion 72, a right front side surface portion 73, and a right front side front portion 74.

The upper surface portion 71 on the right front side extends on the same plane as the rear surface side upper surface portion 81 so as to be connected to the rear surface side upper surface portion 81 on the right front side. The upper surface portion 71 on the right front side extends so that the normal direction is the vertical direction at a position corresponding to the right side surface of the outdoor unit casing 30. The bottom surface portion 72 on the right front surface side is provided so as to face the top surface portion 71 on the right front surface side, and is connected to the back surface bottom surface portion 82 and the right front side on the same plane as the back surface bottom surface portion 82. Is growing. The bottom surface portion 72 on the right front surface extends at a position corresponding to the right surface of the outdoor unit casing 30 such that the normal direction is the vertical direction. The side surface portion 73 on the right front side is provided so as to face the right side surface of the outdoor unit casing 30 and extends on the same plane as the back side right side surface portion 83. The side part 73 on the right front side has the same width as the width in the vertical direction of the back side right side part 83, and the outdoor unit casing 30 extends further from the front side end of the back side right side part 83 toward the front side. It extends to the same position as the front of the. The front part 74 on the right front side is flush with the front side of the outdoor unit casing 30 and extends from the right end of the first support column 31a to the front end of the side part 73 on the right front side. It is a surface having the normal direction as the front-rear direction. The vertical width of the front surface portion 74 on the right front surface side corresponds to the vertical width of the side surface portion 73 on the right front surface side.

The left front side extending portion 70b includes a left front side upper surface 76, a left front side bottom surface 77, a left front side surface 78, and a left front side front 79.

The upper surface portion 76 on the left front surface extends on the same plane as the rear surface upper surface portion 81 so as to be connected to the rear surface upper surface portion 81 on the left front side. The upper surface portion 71 on the left front side extends at a position corresponding to the left side surface of the outdoor unit casing 30 so that the normal direction is the vertical direction. The bottom surface portion 77 on the left front surface side is provided so as to face the top surface portion 76 on the left front surface side, and is connected to the back surface bottom surface portion 82 on the left front side on the same plane as the back surface bottom surface portion 82. Is growing. The bottom surface portion 77 on the left front side extends at a position corresponding to the left side surface of the outdoor unit casing 30 so that the normal direction is the vertical direction. The side surface 78 on the left front side is provided so as to face the left side surface of the outdoor unit casing 30 and extends on the same plane as the back side left side surface portion 84. The side portion 78 on the left front side has the same width as the width in the vertical direction of the back side left side 84, and the outdoor unit casing 30 further extends from the front side end of the back side left side 84 toward the front side. It extends to the same position as the front of the. The front part 79 on the left front side is flush with the front side of the outdoor unit casing 30 and extends from the left end of the fourth support 31d to the front end of the side part 78 on the left front side. It is a surface having the normal direction as the front-rear direction. The vertical width of the front surface portion 79 on the left front side corresponds to the vertical width of the side surface portion 78 on the left front surface side.

Here, in the present embodiment, the wind tunnel 8 has a distance in the left-right direction (a distance indicated by “x” in FIG. 4) from the third heat exchange portion 14c to the side portion 73 on the right front surface side. 14e is configured to be shorter than the distance (the distance indicated by “b” in FIGS. 3 and 4) from the windward end of the air flow of the back side extending portion 80. Similarly, the wind tunnel 8 has a distance in the left-right direction (a distance indicated by “x” in FIG. 4) from the seventh heat exchange portion 14g to the side surface portion 78 on the left front surface side from the fifth heat exchange portion 14e. It is comprised so that it may become shorter than the distance (distance shown by "b" in FIG. 3, FIG. 4) to the windward side edge part of the airflow of the side extending | stretching part 80. FIG. In addition, the distance of the portion indicated by “x” in FIG. 4 is 50 mm or more, and the distance from the fifth heat exchange portion 14e to the windward side end portion of the air flow of the rear side extending portion 80 (FIG. 3, FIG. 4 is preferably shorter than the distance indicated by “b”.

Here, the distance between the left and right “x” in FIG. 4 is the same in the present embodiment, but may be configured to have different lengths.

Moreover, as a relationship between the wind tunnel 8 and the outdoor heat exchanger 14 in the present embodiment, cooling air obtained by transpiration of water droplets also in the third heat exchange portion 14c and the seventh heat exchange portion 14g of the outdoor heat exchanger 14 is used. From the viewpoint of facilitating supply, for example, the width (W2) of the fifth heat exchange portion 14e in the left-right direction / the width (W1) of the back side extending portion 80 in the left-right direction is in the range of 0.5 to 0.9. It is preferable that

In the present embodiment, each of the two-fluid sprayers 6 is disposed on the airflow upstream side of the fifth heat exchange portion 14 e of the outdoor heat exchanger 14, and the third heat exchange portion 14 c of the outdoor heat exchanger 14. Is not disposed between the seventh heat exchange portion 14g of the outdoor heat exchanger 14 and the side surface portion 78 on the left front surface side.

(6) Relationship between the size of the water droplet and the spray position The droplet is of a size that can float in the air and reaches the outdoor heat exchanger 14 to prevent corrosion in the outdoor heat exchanger 14 as early as possible. The size of the droplets that can be produced without using energy that can be evaporated and that offsets the energy-saving effect of cooling the supply air to the outdoor heat exchanger 14 is 30 μm or more and 60 μm or less. It is preferable to spray the liquid droplets in a state mainly containing the liquid droplets (a state containing 70% by weight or more). Water droplets of this size can be obtained by adjusting the output of the liquid feed pump 94 and / or the air feed pump 92.

The size of the droplet can be measured, for example, by obtaining SMD (Sauter average particle diameter) using a phase Doppler laser particle analyzer.

Here, in order to evaporate the droplets before reaching the outdoor heat exchanger 14, it is desirable to secure the distance between the two-fluid sprayer 6 and the outdoor heat exchanger 14 as much as possible. Here, when a long distance between the two-fluid sprayer 6 and the outdoor heat exchanger 14 is secured, water droplets sprayed from the two-fluid sprayer 6 are on the windward side of the wind tunnel 8 (on the side opposite to the outdoor heat exchanger 14 side). ), It is desirable to extend the wind tunnel 8 further to the windward side of the air flow than the two-fluid sprayer 6 so as not to be scattered toward the outside. However, in this way, the distance between the two-fluid sprayer 6 and the outdoor heat exchanger 14 is ensured as much as possible while suppressing water droplets from being scattered on the windward side of the wind tunnel 8. It becomes a problem that it becomes longer in the direction, leading to enlarging, and requiring a large installation space.

Therefore, water droplets having an average particle size of 30 μm or more and 60 μm or less are sprayed as droplets generated with as little energy as possible, and the majority of the sprayed water droplets (for example, 80% by weight or more) are winded in the wind tunnel 8. In order to evaporate inside the wind tunnel 8 without scattering from the upper side to the outside, the wind tunnel 8 extends further to the windward side by 300 mm or more and 900 mm or less in the air flow direction than the installation position of the two-fluid sprayer 6. It is preferable. It is more preferable that the wind tunnel 8 extends further to the windward side by 400 mm or more and 800 mm or less in the air flow direction than the installation position of the two-fluid sprayer 6.

Further, the arrangement of the two-fluid sprayer 6 should not be too close to the outdoor heat exchanger 14 so that water droplets sprayed from the two-fluid sprayer 6 can be evaporated in the entire air flow toward the outdoor heat exchanger 14. For example, the distance from the outdoor heat exchanger 14 is more preferably 100 mm or more, and further preferably 200 mm or more.

(7) Features of this embodiment (7-1)
In the outdoor unit 2 of the present embodiment, water droplets sprayed from the two-fluid sprayer 6 on the windward side of the fifth heat exchange portion 14e of the outdoor heat exchanger 14 are converted into the fifth heat exchange portion 14e of the outdoor heat exchanger 14. It is possible to supply not only to the third heat exchange portion 14c and the seventh heat exchange portion 14g constituting the left and right side surfaces of the outdoor heat exchanger 14.

And in the said embodiment, although the spray of the water droplet from the two fluid sprayer 6 is not performed on the right side of the 3rd heat exchange part 14c of the outdoor heat exchanger 14, or the left side of the 7th heat exchange part 14g, such Cooling air obtained by the evaporation of water droplets sprayed from the two-fluid sprayer 6 on the windward side of the fifth heat exchange portion 14e of the outdoor heat exchanger 14 even when the water droplets are not sprayed from various locations. The third heat exchange portion 14c of the outdoor heat exchanger 14 and the third heat exchange portion 14c extending on the surface intersecting the surface of the fifth heat exchange portion 14e as well as the fifth heat exchange portion 14e of the outdoor heat exchanger 14 It is also possible to supply 7 heat exchange portions 14g.

Thereby, the condensation efficiency improvement effect obtained by the cooling air by the water droplet sprayed on the windward side of the fifth heat exchange portion 14e of the outdoor heat exchanger 14 is the side of the outdoor heat exchanger 14 where the water droplet is sprayed. It can be obtained not only on the surface but also on other surfaces.

(7-2)
The wind tunnel 8 of the outdoor unit 2 of the present embodiment has a fifth heat exchange portion in which the distance in the left-right direction from the third heat exchange portion 14c to the side portion 73 on the right front side (the distance indicated by “x” in FIG. 4) is 14e is configured to be shorter than the distance (the distance indicated by “b” in FIGS. 3 and 4) from the windward end of the air flow of the back side extending portion 80. Further, regarding the distance in the left-right direction from the seventh heat exchange portion 14g to the side surface portion 78 on the left front surface side (the distance indicated by “x” in FIG. 4), the air from the fifth heat exchange portion 14e to the back side extension portion 80 It is comprised so that it may become shorter than the distance (distance shown by "b" in FIG. 3, FIG. 4) to the windward end part of a flow.

For this reason, the cooling effect by the water droplet sprayed on the windward side of the fifth heat exchange portion 14e in the outdoor heat exchanger 14 is obtained also in portions other than the fifth heat exchange portion 14e, and the outdoor unit 2 including the wind tunnel 8 It becomes possible to make the width in the left-right direction compact. Thereby, the space required for installation can be reduced.

Moreover, since the back side extending portion 80 of the wind tunnel 8 of the above embodiment is provided sufficiently long on the windward side from the place where the two-fluid sprayer 6 is installed, water droplets sprayed from the two-fluid sprayer 6 are wind tunnels. It is possible to evaporate water droplets inside the wind tunnel 8 and to use the cooling air without escaping while suppressing leakage from the windward side 8 to the outside.

(7-3)
In the outdoor unit 2 according to the embodiment of the present embodiment, the distance indicated by “x” in FIG. 4 is 10 mm, the example is 50 mm, the example is 100 mm, and the comparison target shown in FIGS. For the outdoor unit 902, a simulation for confirming the degree of the effect of cooling air in the third heat exchange portion 14c and the seventh heat exchange portion 14g of the outdoor heat exchanger 14, and each heat exchange of the outdoor heat exchanger 14 A simulation for confirming the wind speed distribution in the portions 14a to 14g was performed.

Here, in the outdoor unit 2 according to the example of the present embodiment, the distance indicated by “x” in FIG. 4 is 10 mm, the example is 50 mm, and the example is 100 mm. The dimensions of “a”, “b”, “c”, “d”, “e”, “f”, “g”, and “h” were as follows. That is, a = 300 mm, b = 1000 mm, c = 1000 mm, d = 300 mm, e = 500 mm, f = 700 mm, g = 300 mm, h = 500 mm.

Moreover, in the outdoor unit 902 to be compared, the configuration other than the wind tunnel is the same as that of the outdoor unit 2 according to the example of the present embodiment, and as shown in FIGS. The wind tunnel 908 extends in the four directions. The wind tunnel 908 of the outdoor unit 902 to be compared has a wind tunnel 908a, a wind tunnel 908b, a wind tunnel 908c, and a wind tunnel 908d in the front and rear and left and right directions of the outdoor unit casing 30, respectively. Here, in the outdoor unit 902 to be compared, each of “j”, “k”, “l”, “m”, “n”, “o”, “p” shown in FIG. 8, FIG. 9, and FIG. The dimensions were as follows. That is, j = 300 mm, k = 1000 mm, l = 300 mm, m = 500 mm, n = 300 mm, o = 700 mm, and p = 1000 mm.

In both cases, water droplets are sprayed from the two-fluid sprayer 6 to the back side.

The simulation results showing the surface temperature distribution of the cooling effect in the outdoor heat exchanger 14 are shown in FIG. 11 and FIG. 12 (FIG. 12 shows the same result as FIG. 11 seen from different angles. .) In FIG. 11 and FIG. 12, the color tone is changed depending on the surface temperature of the outdoor heat exchanger 14, and the distribution of the high temperature region, the medium temperature region, and the low temperature region is generated.

Also, the following table shows the simulation results showing the surface temperature distribution and the like in the outdoor heat exchanger 14.

Here, the case where the length of “x” is 10 mm is referred to as Case 1, the case where the length of “x” is 50 mm is referred to as Case 2, and the case where the length of “x” is 100 mm is referred to as Case 3. The outdoor unit 902 was referred to as Case 4. Further, “heat exchange numbers” 1 to 7 correspond to the first heat exchange portion 14a to the seventh heat exchange portion 14g, respectively.

According to the simulation results of the cooling effect described above, in any example, not only the fifth heat exchange portion 14e but also the third heat exchange portion 14c and the seventh heat exchange portion 14g of the outdoor heat exchanger 14 are cooled. It was confirmed that the effect could be obtained.

Furthermore, the results of simulation such as wind speed distribution in the outdoor heat exchanger 14 are shown below.

According to the above simulation results, when the length of “x” is only about 10 mm, the wind speed is small in the third heat exchange portion 14c and the seventh heat exchange portion 14g, and the portion is sufficiently in the place. It was confirmed that there was a possibility that it was not possible to perform proper heat exchange. On the other hand, when the length of “x” is 50 mm or more, it was confirmed that a sufficient wind speed was secured also in the third heat exchange portion 14c and the seventh heat exchange portion 14g.

(8) Modification (8-1) Modification A
In the said embodiment, it has four surfaces (1st heat exchange part 14a, 3rd heat exchange part 14c, 5th heat exchange part 14e, 7th heat exchange part 14g) as the outdoor heat exchanger 14 in planar view. The case where it exists is described as an example.

However, the outdoor heat exchanger is not limited to one having four surfaces provided so as to intersect each other with such adjacent surfaces, for example, having only three surfaces, It may have only two surfaces. Even in these cases, it is possible to supply the cooling air even on the surface intersecting the surface where the two-fluid sprayer 6 is disposed.

(8-2) Modification B
In the above embodiment, the case where the two-fluid sprayer 6 is configured to spray water droplets radially toward the side opposite to the outdoor heat exchanger 14 side has been described as an example.

However, the spraying direction of the water droplets from the two-fluid sprayer 6 is not particularly limited, and the outdoor heat from the two-fluid sprayer 6 can be used as long as the floating distance of the waterdrops with the outdoor heat exchanger 14 can be long. You may make it spray a water drop toward the exchanger 14 side.

1 Air conditioning equipment (refrigeration equipment)
2 Outdoor unit (heat source unit)
6 Two-fluid sprayer (sprayer)
8 Wind tunnel 14 Outdoor heat exchanger (heat exchanger)
14c 3rd heat exchange part (2nd heat exchange part, 3rd heat exchange part)
14e 5th heat exchange part (1st heat exchange part)
14g 7th heat exchange part (3rd heat exchange part, 2nd heat exchange part)
15 Outdoor fan (fan)
30 Outdoor unit casing (casing)
70 Front side extension part (second extension part, third extension part)
73 Side part on the right front side (second extending part, third extending part)
78 Side part on the left front side (third extension part, second extension part)
80 Back side extension part 83 Back side right side part (1st extension part)
84 Back side left side (first extension)

JP 2013-76538 A

Claims

A heat source unit (2) of the refrigeration apparatus (1),
It has at least a first heat exchange part (14e) spread on the first surface and a second heat exchange part (14c, 14g) spread on a second surface orthogonal to the first surface. A heat exchanger (14),
A fan (15) for creating an air flow through the heat exchanger;
A first extending portion (80, 83, 84) extending in a direction intersecting the first surface toward the windward side of the first heat exchange portion in the air flow, and the second heat exchange in the air flow. A wind tunnel having a second extending portion (70, 73, 78) extending on the windward side of the portion while ensuring a gap with the second heat exchanging portion and continuing to the first extending portion (8) and
A sprayer (6) for spraying water in the wind tunnel and on the windward side of the first heat exchange part in the air flow;
A heat source unit (2) of a refrigeration apparatus (1) comprising:
The wind tunnel has a distance from the second heat exchanging portion to the second extending portion in the normal direction of the second surface such that the distance from the first heat exchanging portion in the normal direction of the first surface to the first extending portion. Shorter than the distance to the windward end of the air flow of the part,
The heat source unit of the refrigeration apparatus according to claim 1.
The distance from the second heat exchange part to the second extension part in the normal direction of the second surface is 50 mm or more.
The heat source unit of the refrigeration apparatus according to claim 2.
Ratio of the width of the first heat exchange part in the normal direction of the second surface to the width of the first extension part in the normal direction of the second surface (the first heat in the normal direction of the second surface) The value of the width of the exchange part / the width of the first extension part in the normal direction of the second surface) is 0.5 or more and 0.9 or less.
The heat source unit of the refrigeration apparatus according to any one of claims 1 to 3.
In the gap space between the second heat exchange part and the second extension part, water is not sprayed.
The heat source unit of the refrigeration apparatus according to any one of claims 1 to 4.
The air flow passage area of the first heat exchange part (14e) is wider than the air flow passage area of the second heat exchange part (14c, 14g),
The heat source unit of the refrigeration apparatus according to any one of claims 1 to 5.
The heat exchanger further includes a third heat exchanging portion (14g, 14c) extending on a third surface facing the second surface while being orthogonal to the first surface,
The wind tunnel expands while securing a gap with the third heat exchange part on the windward side of the third heat exchange part in the air flow, and is continuous with the first extension part. Part (70, 78, 73),
The heat source unit of the refrigeration apparatus according to any one of claims 1 to 6.