JP5998476B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner including a spray mechanism having a two-fluid nozzle.

  Conventionally, an air conditioner having a spray mechanism for spraying water from a spray nozzle onto a heat exchanger to cool the heat exchanger is known. In this air conditioner, since the heat exchanger is cooled by the sprayed water, the efficiency of the refrigeration cycle is increased, and the power (power consumption) required for the air conditioner can be reduced.

  For example, Patent Literature 1 discloses an air conditioner equipped with a two-fluid nozzle that sprays water and air simultaneously as a spray nozzle of a spray mechanism. In the two-fluid nozzle, when the volume ratio (ALR) of the amount of air and the amount of water decreases, the particle size of water droplets sprayed from the nozzle increases. Water droplets having a large particle size may adhere to the heat exchanger without being completely evaporated in the process toward the heat exchanger. Water droplets adhering to the heat exchanger cause corrosion of the heat exchanger. Patent Document 1 discloses a technique in which the amount of air and water are adjusted so that ALR is 500 or more and 600 or less, and fine mist having a particle size of 10 μm or less is sprayed from a two-fluid nozzle. Patent Document 1 describes that the fine mist evaporates before reaching the heat exchanger, and water droplets can be prevented from adhering to the heat exchanger.

JP 2008-128500 A

  However, when the amount of water sprayed from the two-fluid nozzle is changed, the air amount to be changed and the amount of water are temporarily varied and the ALR tends to fluctuate. May be larger than range.

  The objective of this invention is providing the air conditioner which can change the spraying quantity, suppressing the particle size of the water droplet sprayed from a two-fluid nozzle becoming large.

(1) The air conditioner of this invention is provided with the outdoor heat exchanger (13) provided in the refrigerant circuit (5), the spray mechanism (20), and the spray mechanism control part (4a). The spray mechanism (20) includes a two-fluid nozzle (21) for spraying water onto the air toward the outdoor heat exchanger (13), and an air supply mechanism (70) for supplying air to the two-fluid nozzle (21). And a water supply mechanism (60) for supplying water to the two-fluid nozzle (21). The spray mechanism control unit (4a) is configured so that the volume ratio of the amount of air supplied to the two-fluid nozzle (21) and the amount of water supplied to the two-fluid nozzle (21) is 20 or more and 200 or less. The spray mechanism (20) is controlled. When increasing the amount of water spray from the two-fluid nozzle (21), the spray mechanism control unit (4a) executes control to increase the amount of water after increasing the amount of air. The two-fluid nozzle (21) includes a spray unit (51) that sprays water containing a large number of bubbles to the outside. The spray section (51) sprays water that has been refined by the expansion of the bubbles due to a pressure difference.

In this configuration, when the amount of water spray is increased, even if the amount of increase in water temporarily varies and the amount of increase in water temporarily exceeds the desired range, the amount of water is reduced. At the time of change, the air amount has already been increased (or the increase in the air amount has been started), so that it is possible to suppress the ALR from becoming excessively small. Thereby, the spraying amount can be changed while suppressing the particle size of the water droplet sprayed from the two-fluid nozzle (21) from increasing. Moreover, in this structure, when water containing many bubbles is sprayed from the spraying part (51) or after being sprayed from the spraying part (51), the bubbles are repelled and the droplets are miniaturized. Therefore, in this configuration, unlike the conventional two-fluid nozzle, large power for injecting air into water at high speed in the injection hole of the spray nozzle is not required. In other words, this configuration only requires the power to form a large number of bubbles in the water, so less air is required than in the past, and the power required to send air is higher than in the past. Can be reduced. Thereby, the motive power as the whole air conditioning apparatus can be reduced effectively. In addition, since the two-fluid nozzle (21) in which a large number of bubbles are mixed in water in advance is used, compressed air and water are separately supplied to the tip (spray hole) of the spray nozzle, and the momentum of the compressed air. Compared to the case of using a conventional two-fluid nozzle that forms water droplets, fine water droplets equivalent to the conventional one can be formed even if the lower limit of the volume ratio is set small. Therefore, in this configuration, the volume ratio can be set to a range having a low lower limit value of 20 or more. Thereby, the motive power which produces the compressed air sent to a two-fluid nozzle (21) can be reduced compared with the past.

  (2) In the air conditioner, when the spray mechanism control unit (4a) decreases the spray amount of water from the two-fluid nozzle (21), the control reduces the air amount after decreasing the water amount. Is preferably performed.

  In this configuration, when the spray amount of water is decreased, even if the amount of decrease in the air amount temporarily decreases and the amount of decrease in the air amount temporarily exceeds a desired range, At the time of changing the air amount, the amount of water has already been reduced (or the reduction of the amount of water has started), so that it is possible to suppress the ALR from becoming excessively small. Thereby, the amount of spraying can be changed in the state which controlled more reliably that the particle size of the water droplet sprayed from a two fluid nozzle (21) becomes large.

  ADVANTAGE OF THE INVENTION According to this invention, spraying quantity can be changed, suppressing that the particle size of the water droplet sprayed from a two-fluid nozzle becomes large.

It is a schematic structure figure showing an air harmony machine concerning one embodiment of the present invention. It is the schematic which shows the outdoor unit and spraying mechanism of the said air conditioner. It is sectional drawing which shows the spray nozzle of the said spray mechanism. It is a graph which shows the relationship between ALR and the particle size of a water droplet. It is a flowchart which shows the control example 1 of the said air conditioner. It is a flowchart which shows the control example 2 of the said air conditioner.

<Overall structure of air conditioner>
Hereinafter, an air conditioner 1 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the air conditioner 1 includes an outdoor unit 2, an indoor unit 3, a spray mechanism 20, and a controller 4 that controls these units.

  The indoor unit 3 includes an indoor heat exchanger 11 and an indoor fan 12. The outdoor unit 2 includes an outdoor heat exchanger 13, an outdoor blower 14, a refrigerant compressor 15, a four-way switching valve 8, and an expansion valve 9. The indoor unit 3 and the outdoor unit 2 are connected by a gas side communication pipe 6 and a liquid side communication pipe 7. The air conditioner 1 includes a refrigerant circuit 5, which includes a refrigerant compressor 15, an outdoor heat exchanger 13, an expansion valve 9, an indoor heat exchanger 11, a four-way switching valve 8, a refrigerant pipe that connects these, and the like. It is constituted by.

  In the air conditioner 1, the cooling operation and the heating operation can be switched by switching the route of the four-way switching valve 8. In the case of the route of the four-way switching valve 8 indicated by a solid line in FIG. 1, the air conditioner 1 performs a cooling operation, and in the case of the route of the four-way switching valve 8 indicated by a broken line in FIG. Do.

  The indoor heat exchanger 11 exchanges heat between the refrigerant circulating in the refrigerant circuit 5 and the indoor air supplied by the indoor blower 12. The outdoor heat exchanger 13 exchanges heat between the refrigerant circulating in the refrigerant circuit 5 and the outdoor air supplied by the outdoor blower 14. Examples of the indoor heat exchanger 11 and the outdoor heat exchanger 13 include, but are not limited to, 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.

  As shown in FIG. 2, the outdoor heat exchanger 13 extends upward from the bottom plate of the case 10 and has a substantially U shape in plan view. The side plate of the case 10 is provided with a suction port (not shown) at a position facing the outdoor heat exchanger 13 in order to suck outside air into the case 10. The top plate of the case 10 is provided with an unillustrated air outlet for blowing the air in the case 10 to the outside. The outdoor unit 2 includes a temperature sensor 91 that detects the outside air temperature.

  As the indoor blower 12 and the outdoor blower 14, a centrifugal blower, an axial blower, a mixed flow blower, or the like can be used. As shown in FIG. 2, the outdoor blower 14 includes an impeller 14a and a motor (not shown) that rotates the impeller 14a. In the present embodiment, the outdoor blower 14 is located downstream of the outdoor heat exchanger 13 in the air flow direction. The outdoor blower 14 is provided in the upper part in the case 10, and is located just under the said blower outlet.

  The function of the controller 4 includes a spray mechanism control unit 4 a that controls the spray mechanism 20. The controller 4 includes a storage unit (memory) 4b. In the storage unit 4b, various setting values such as an ALR target value (or target range), an air increase amount, and a water increase amount, which will be described later, are stored in advance. As shown in FIG. 2, in the present embodiment, the controller 4 is arranged in the case 10 of the outdoor unit 2, but is not limited to this. For example, the controller 4 may be disposed in the case of the indoor unit 3, or may be disposed in a place other than the outdoor unit 2 and the indoor unit 3.

  During operation of the air conditioner 1, the refrigerant is circulated between the outdoor unit 2 and the indoor unit 3 by applying power to the refrigerant compressor 15, and the blades are supplied by supplying power to the motor of the outdoor blower 14. The vehicle 14a rotates and outside air is sucked into the case 10 from the suction port. The outside air sucked into the case 10 exchanges heat with the refrigerant in the outdoor heat exchanger 13 and then blows out to the outside of the case 10 through the outlet. Specifically, at the time of cooling operation, for example, the outside air sucked into the case 10 passes through the heat transfer tube in the outdoor heat exchanger 13 functioning as a condenser, and the high-temperature and high-pressure refrigerant and heat flowing in the heat transfer tube. Exchange. That is, the outside air cools the heat transfer tubes and the refrigerant of the outdoor heat exchanger 13. Thereby, the refrigerant | coolant which flows through the said heat exchanger tube is cooled and condensed.

<Structure of spray mechanism>
Next, the spray mechanism 20 will be described. The spray mechanism 20 can cool the outside air toward the outdoor heat exchanger 13 during the cooling operation. The spray mechanism 20 can enhance the effect of cooling the heat transfer tubes and the refrigerant of the outdoor heat exchanger 13 by reducing the temperature of the outside air toward the outdoor heat exchanger 13. Thus, the spray mechanism 20 can enhance the cooling capacity of the air conditioner 1 by assisting cooling of the outdoor heat exchanger 13 and the refrigerant.

  As shown in FIG. 2, the spray mechanism 20 includes a two-fluid nozzle 21, a water supply mechanism 60, and an air supply mechanism 70.

  The two-fluid nozzle 21 is supported by a side plate of the case 10 or a support member (not shown) provided separately in the case 10. The two-fluid nozzle 21 is located upstream of the outdoor heat exchanger 13 in the direction of the airflow formed by the rotation of the impeller 14 a of the blower 14.

  In the present embodiment, the two-fluid nozzle 21 is arranged such that water droplets are sprayed toward the outdoor heat exchanger 13. The two-fluid nozzle 21 is arranged with its axial direction oriented in a direction along the air flow direction. Water droplets sprayed from the two-fluid nozzle 21 move toward the outdoor heat exchanger 13 along the direction of the air flow while diffusing radially.

  The direction of the axial direction of the two-fluid nozzle 21 is not limited to the form shown in FIG. 1, and may be, for example, a direction orthogonal to the direction of the airflow formed by the blower 14. It may be the direction to do. The direction in which water is sprayed from the two-fluid nozzle 21 may be the direction opposite to the airflow. In this case, the water droplets sprayed in the direction opposite to the air flow are pushed back by the air flow and follow a path whose direction is reversed in the direction of the outdoor heat exchanger 13. Thereby, the path | route length which a water drop follows upstream from the outdoor heat exchanger 13 can be enlarged.

  The water supply mechanism 60 includes a liquid feed pipe 61, a flow rate adjustment valve 92 as a water amount adjustment mechanism, a pressure regulator 93, a strainer 94, and a flow meter 95 as a water amount detection unit. The liquid feed pipe 61 connects a water supply source (not shown) and the two-fluid nozzle 21. Examples of the water supply source include water supply such as water supply. The flow rate adjustment valve 92 can be adjusted in opening. Water flowing into the liquid feed pipe 61 from the water supply source is filtered by the strainer 94 and the water pressure is adjusted by the pressure regulator 93. The water whose water pressure has been adjusted is sent to the two-fluid nozzle 21 with the water amount adjusted in accordance with the opening degree of the flow rate adjusting valve 92. The opening degree of the flow rate adjusting valve 92 is controlled by the spray mechanism control unit 4 a of the controller 4.

  As the water amount adjustment mechanism, for example, a liquid feed pump or the like can be used instead of the flow rate adjustment valve 92. The water supply source may be an unillustrated tank in which water is stored. In this case, the liquid feed pipe 61 is connected to a water supply port provided in the tank, and the water in the tank is sent to the two-fluid nozzle 21 using a liquid feed pump or the like.

  The air supply mechanism 70 includes an air supply pipe 71, a flow rate adjustment valve 19 as an air amount adjustment mechanism, an air compressor 17, and a flow meter 18 as an air amount detection unit. The air supply pipe 71 connects the air compressor 17 and the two-fluid nozzle 21.

  Next, the structure of the two-fluid nozzle 21 will be described. The two-fluid nozzle 21 can spray fine water droplets with water and air. The two-fluid nozzle 21 has a trunk portion 90 and an orifice portion 50 located downstream of the trunk portion 90 (downstream side in the water flow direction). The trunk portion 90 has a function of mixing fine bubbles into the water supplied to the trunk portion 90 from a water supply source (not shown) such as tap water, and a function of guiding water mixed with bubbles to the orifice portion 50. ing. The orifice unit 50 has a function of atomizing and spraying water droplets.

  The trunk portion 90 has a cylindrical outer shape that is longer in the axial direction than in the radial direction. The trunk portion 90 includes an air guide tube 31 and a water guide tube 41 disposed inside the air guide tube 31. That is, the water guide pipe 41 is inserted into the air guide pipe 31. The axial direction of the air guide tube 31 and the axial direction of the water guide tube 41 coincide. Further, these axes are located on substantially the same straight line. The inner peripheral surface of the air guide tube 31 and the outer peripheral surface of the water guide tube 41 are separated from each other. A liquid feed pipe 61 shown in FIG. 2 is connected to the upstream end of the water guide pipe 41.

  The water guide tube 41 is provided with a plurality of air introduction holes 43a penetrating in the thickness direction. The air guide pipe 31 is provided with an air supply part 32 for supplying air to the air flow path F1. The air supply part 32 has a cylindrical shape in which an air supply hole 32a communicating with the air flow path F1 is formed. An air supply pipe 71 shown in FIG. 2 is connected to the air supply unit 32.

  One end (downstream end) of the air guide pipe 31 and one end (downstream end) of the water guide pipe 41 are at substantially the same position in the axial direction, and the other end (upstream end) of the water guide pipe 41. Is located upstream of the other end (upstream end) of the air guide tube 31. That is, the portion on the other end side of the water guide tube 41 protrudes upstream from the air guide tube 31. One end of the air flow path F <b> 1 is closed by the orifice unit 50, and the other end of the air flow path F <b> 1 is closed by the closing member 33.

  The trunk portion 90 includes an air guide portion 30, a water guide portion 40, and a bubble forming portion 43. The water guide part 40 includes a water flow path F <b> 2 defined by the inner peripheral surface of the water guide pipe 41. The air guide unit 30 includes an air flow path F <b> 1 defined by the outer peripheral surface of the water guide tube 41 and the inner peripheral surface of the air guide tube 31.

  The bubble forming part 43 includes a plurality of air introduction holes 43a. The plurality of air introduction holes 43 a are arranged at intervals in the circumferential direction and the axial direction of the water guide pipe 41. The bubble forming portion 43 refers to a cylindrical portion of the water guide pipe 41 from the air introduction hole 43a located at the most upstream to the air introduction hole 43a located at the most downstream.

  The orifice unit 50 includes a spray unit 51 for atomizing water droplets and spraying, and a blocking unit 52 for closing one end of the air flow path F1. The blocking part 52 is an annular area on the radially outer side, and the spray part 51 is an area on the radially inner side with respect to the blocking part 52. The closing portion 52 has an inner surface (upstream surface) 52a that contacts one end of the air guide tube 31 and one end of the water guide tube 41 to close one end of the air flow path F1.

  The spray unit 51 has a communication hole that communicates the water flow path F <b> 2 and the outside of the two-fluid nozzle 21. The communication hole includes a tapered hole 51a having a tapered surface whose inner diameter decreases toward the downstream side, and a spray hole 51b that is located on the downstream side of the tapered hole 51a and sprays water.

  The water flowing downstream through the tapered hole 51a along the tapered surface is gradually increased in flow rate and reaches the spray hole 51b. The water that has reached the spray hole 51b contains a large number of fine bubbles, and is sprayed to the outside of the two-fluid nozzle 21 together with these bubbles. When water containing a large number of bubbles is sprayed from the spray holes 51b or after being sprayed from the spray holes 51b, the bubbles expand and repel due to the pressure difference between the inside and outside, and the water droplets are refined.

  The particle diameter of water droplets sprayed from the two-fluid nozzle 21 can be adjusted mainly by adjusting ALR (air amount (volume) / water amount (volume)). FIG. 4 is a graph showing the relationship between ALR and the particle size of water droplets. As shown in FIG. 4, the particle size of water droplets sprayed from the two-fluid nozzle 21 tends to decrease as the ALR increases.

  The maximum allowable particle diameter of water droplets sprayed from the two-fluid nozzle 21 is set to a value that allows the water droplets sprayed from the two-fluid nozzle 21 to evaporate before reaching the outdoor heat exchanger 13. Specifically, the maximum allowable particle size of the water droplets is the path length that the water droplets follow between the two-fluid nozzle 21 and the outdoor heat exchanger 13, the axial direction of the two-fluid nozzle 21 with respect to the direction of the airflow, and the adjusted ALR. Is appropriately set according to the conditions such as the variation in the particle diameter of the water droplets sprayed.

  In the air conditioner 1, the target ALR during the operation of the spray mechanism 20 is set to a predetermined ALR target value or a predetermined ALR target range. When the spray mechanism 20 is controlled based on a predetermined ALR target value, the ALR target value is sprayed from the two-fluid nozzle 21 based on characteristic data unique to the spray mechanism 20 as shown in FIG. The water droplet diameter is set to a value that is less than or equal to the maximum allowable particle diameter.

  When the spray mechanism 20 is controlled based on a predetermined ALR target range, the lower limit value of the ALR target range is, for example, characteristic data unique to the spray mechanism 20 as shown in FIG. Is set to a value at which the particle size of the water droplet sprayed from the two-fluid nozzle 21 is equal to or less than the maximum allowable particle size.

  In the present embodiment, since the two-fluid nozzle 21 as shown in FIG. 3 is used, even if the ALR is smaller than the conventional two-fluid nozzle that simultaneously injects air and water in the spray hole of the spray nozzle, Equivalent fine water droplets can be formed. Specifically, in the present embodiment, the two-fluid nozzle 21 including the water guide portion 40 in which water flows and air flowing through the air guide portion 30 flows into the water to form water containing a large number of bubbles is used. Therefore, the lower limit value of the ALR target range can be set to 20, for example. In other words, in this embodiment, the ALR target range can be 20 or more.

  On the other hand, the upper limit value of the ALR target range is not particularly limited, but is preferably set to a small value in terms of suppressing an increase in power consumed by the air compressor 17. For example, the upper limit value of the ALR is, for example, heat exchange by water droplets sprayed from the two-fluid nozzle 21 when power consumed to operate the spray mechanism 20 including power consumed by the air compressor 17 is used. It is set in a range not exceeding the power consumption reduced due to the cooling action of the vessel.

  The upper limit value of the ALR target range can be set to, for example, 200, preferably 100, and more preferably 50.

  In the present embodiment, as in Control Examples 1 and 2 described below, when changing the spray amount to increase the spray amount, the water amount is increased in order to prevent the particle size of the water droplet from exceeding the maximum allowable particle size. Perform control to increase air volume before. In these control examples 1 and 2, when the spray amount is changed to increase the spray amount, the particle size of the water droplet is prevented from temporarily increasing. That is, since it is possible to suppress the formation of water droplets having a large particle size before and after the change of the spray amount, water droplets having a fine particle size can be continuously sprayed before and after the change of the spray amount.

<Control example 1>
Next, a control example 1 of the air conditioner 1 will be described. In this control example 1, when increasing the spray amount of water, the spray mechanism control unit 4a of the controller 4 executes control to increase the air amount before increasing the water amount. Specifically, it is as follows.

  FIG. 5 is a flowchart showing a control example 1 of the air conditioner 1. As shown in FIG. 5, in the air conditioner 1, for example, when the cooling operation is started (step S <b> 1), the spray mechanism control unit 4 a detects the outside air temperature detected by the temperature sensor 91 and the discharge pressure of the refrigerant compressor 15. Based on the above, it is determined whether or not the cooling operation load has reached a predetermined level (step S2). When the cooling operation load has reached a predetermined level, the spray mechanism control unit 4a determines that water spray by the spray mechanism 20 is necessary (YES in step 2).

  Next, the spray mechanism control unit 4a starts the water spray by controlling the spray mechanism 20 so that a spray amount of water droplets suitable for the cooling operation load is sprayed from the spray mechanism 20 (step S3). At this time, in addition to adjusting the spray amount of water to a predetermined value (or a predetermined range), the spray mechanism control unit 4a further adjusts ALR to a predetermined target value (or a predetermined target range). The ALR is adjusted by controlling the air compressor 17 and the flow rate adjustment valve 19 in the air supply mechanism 70 and the pressure regulator 93 and the flow rate adjustment valve 92 in the water supply mechanism 60. The amount of air sent to the two-fluid nozzle 21 is measured by the flow meter 18, and the amount of water sent to the two-fluid nozzle 21 is measured by the flow meter 95.

  Next, the spray mechanism control unit 4a determines whether or not it is necessary to increase the amount of water spray based on the cooling operation load at that time (step S4). When it is necessary to increase the amount of water spray (YES in step S4), the spray mechanism control unit 4a first increases the amount of air (step S5), and then increases the amount of water (step S6).

  The amount of air to be increased in step S5 is determined in advance corresponding to the cooling operation load, and is stored in the storage unit 4b. In step S5, the amount of air is increased before the amount of water is increased, so the ALR temporarily increases and may exceed a predetermined target value (or a predetermined target range). Since the particle size is small, there is no particular problem in terms of particle size.

  The amount of water to be increased in step S6 (the amount of water to be increased after the air amount is increased) is determined based on, for example, characteristic data unique to the spray mechanism 20 as shown in FIG. Range).

  Next, the spray mechanism control unit 4a determines whether or not it is necessary to continue water spray (step S7). As this judgment standard, for example, the elapsed time from the start of water spraying has reached a predetermined time. Further, for example, based on the outside air temperature detected by the temperature sensor 91, the discharge pressure of the compressor 15, and the like, it may be determined that the cooling operation load has fallen below a predetermined level.

  When it is not necessary to continue water spraying, the spray mechanism control unit 4a closes the flow rate adjusting valves 19 and 92 and stops water spraying from the two-fluid nozzle 21 (step S8). The spray mechanism control unit 4a stops the air compressor 17.

  When it is necessary to continue water spraying, the spray mechanism control unit 4a returns to step S4 and repeats the control of steps S4 to S8 described above.

  In step S4, when the spray mechanism control unit 4a determines that it is not necessary to increase the spray amount of water (NO in step S4), the spray amount of water is determined based on the cooling operation load at that time. It is determined whether or not it is necessary to decrease (step S9). When it is necessary to decrease the spray amount of water (YES in step S9), the spray mechanism control unit 4a decreases the air amount and the water amount (step S10). When the reduction of the water spray amount is completed, the ALR is adjusted to a predetermined target value (or a predetermined target range).

<Control example 2>
Next, a control example 2 of the air conditioner 1 will be described. In the control example 2, when the spray amount of the water is increased, the spray mechanism control unit 4a further performs the control to increase the air amount before increasing the water amount, and further decreases the spray amount of water. In this case, the control for reducing the amount of water is executed before the amount of air is reduced. Specifically, it is as follows.

  FIG. 6 is a flowchart showing a control example 2 of the air conditioner 1. As illustrated in FIG. 6, Steps S1 to S9 of Control Example 2 are the same as Steps S1 to S9 of Control Example 1. In the control example 2, when it is necessary to reduce the spray amount of water (YES in step S9), the spray mechanism control unit 4a first decreases the water amount (step S10), and then decreases the air amount (step S10). Step S11).

  In step S10, since the amount of water is decreased before the amount of air is decreased, the ALR temporarily increases and may exceed a predetermined target value (or a predetermined target range), but if the ALR increases, Since the particle size is small, there is no particular problem in terms of particle size.

  The amount of air to be decreased in step S11 is set so that the ALR becomes a predetermined target value (or a predetermined target range) based on characteristic data unique to the spray mechanism 20 as shown in FIG. 4, for example.

  As described above, in the present embodiment, since the spray mechanism 20 that sprays water on the air toward the outdoor heat exchanger 13 is provided, the outdoor heat exchanger 13 is configured as compared with the case where water is not sprayed. The temperature of the passing air is lowered. Thereby, the efficiency of a refrigerating cycle increases and the motive power required to drive the refrigerant compressor 15 etc. at the time of the cooling operation of the air conditioner 1 can be reduced.

  Moreover, in the control example 1 of this embodiment, when increasing the spray amount of the water from the two-fluid nozzle 21, the spray mechanism control part 4a performs control which increases the amount of water after increasing the amount of air. Therefore, when the amount of water spray is increased, the amount of water is changed even if the amount of increase in water temporarily varies and the amount of increase in water temporarily exceeds the desired range. Since the air amount has already been increased at the time, it is possible to suppress the ALR from becoming excessively small. Thereby, it is possible to change the spray amount while suppressing the particle size of the water droplets sprayed from the two-fluid nozzle 21 from increasing.

  Further, in the control example 2 of the present embodiment, when the amount of water spray is decreased, a temporary variation occurs in the amount of decrease in the air amount so that the amount of decrease in the air amount temporarily exceeds a desired range. Even in such a case, since the amount of water has already been reduced when the air amount is changed, it is possible to suppress the ALR from becoming excessively small. Thereby, it is possible to change the spray amount in a state where the increase in the particle size of the water droplet sprayed from the two-fluid nozzle 21 is more reliably suppressed.

  Further, in the present embodiment, the two-fluid nozzle 21 has an air guide portion 30 through which air flows and water flows, and the air flowing through the air guide portion 30 flows into the water to form water containing a large number of bubbles. The water guide part 40 is provided, and the spray part 51 that is located downstream of the water guide part 40 in the water flow direction and sprays water containing a large number of bubbles formed in the water guide part 40 to the outside. . That is, in this configuration, water containing a large number of bubbles is formed in the water guide unit 40, and when the water containing a large number of bubbles is sprayed from the spray unit 51 or after being sprayed from the spray unit 51, the bubbles repel. The droplets are made finer. Since the droplets thus made finer are easily vaporized (evaporated) before reaching the heat exchanger 13, the droplets are prevented from adhering to the heat exchanger 13. Thereby, corrosion of the heat exchanger 13 is suppressed. Moreover, in this configuration, unlike the conventional two-fluid nozzle, large power for injecting air into water at high speed is not required in the spray hole of the spray nozzle. That is, in this configuration, only the power for forming a large number of bubbles in the water flowing through the water guide unit 40 is required. It is possible to reduce the power required for this. Thereby, the motive power as the whole air conditioning apparatus can be reduced effectively.

  Moreover, in this embodiment, the water guide part 40 has a tube shape and has one or a plurality of air introduction holes 43a penetrating in the thickness direction. It has a tube shape surrounding the outer periphery. By adopting a double pipe structure in which the air guide portion 30 is disposed so as to surround the outer periphery of the water guide portion 40 provided with one or a plurality of air introduction holes 43a as in this configuration, the two-fluid nozzle 21 is provided. Can be manufactured at low cost.

  Moreover, in this embodiment, since the several air introduction hole 43a is provided mutually spaced apart in the circumferential direction of the water guide part 40, and the direction where the water guide part 40 is extended, there is one air introduction hole 43a. Compared to the case, air can be caused to flow into the water of the water guide 40 from a plurality of portions spaced from each other in the circumferential direction and the direction in which the water guide 40 extends. Therefore, the bubbles can be efficiently dispersed in the water flowing through the water guide unit 40. In addition, compared with the case where there is one air introduction hole 43a, the resistance to allow air to flow into water is reduced, and the pressure required to allow air to flow into water can be set low. Thereby, motive power can further be reduced.

  Moreover, in this embodiment, since the two-fluid nozzle 21 as described above is used, the volume ratio is higher than that in the case of using a conventional two-fluid nozzle that simultaneously injects air and water in the spray hole of the spray nozzle. Even if the lower limit is set small, fine water droplets equivalent to the conventional one can be formed. Therefore, in this configuration, the volume ratio can be set to a low lower limit value of 20 or more. Thereby, the motive power which produces the compressed air sent to the two-fluid nozzle 21 can be reduced compared with the past.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, A various change, improvement, etc. are possible in the range which does not deviate from the meaning.

  For example, in the above-described embodiment, the case where the two-fluid nozzle in which air is mixed with water in advance on the upstream side of the spray hole is used as the two-fluid nozzle 21. For example, a two-fluid nozzle that simultaneously injects air and water in the spray hole of the spray nozzle can be used.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Outdoor unit 3 Indoor unit 4 Controller 4a Spray mechanism control part 4b Memory | storage part 5 Refrigerant circuit 13 Outdoor heat exchanger 15 Refrigerant compressor 16 Tank 18 Air quantity detection part 19 Air quantity adjustment mechanism 20 Spray mechanism 21 Spray nozzle 30 Air Guide 40 Water Guide 51 Spraying 60 Water Supply 70 Air Supply Mechanism

Claims (2)

An outdoor heat exchanger (13) provided in the refrigerant circuit (5);
A two-fluid nozzle (21) for spraying water onto the air toward the outdoor heat exchanger (13), an air supply mechanism (70) for supplying air to the two-fluid nozzle (21), and the two-fluid nozzle (21 ) A spray mechanism (20) having a water supply mechanism (60) for supplying water to
A spray mechanism that controls the spray mechanism (20) so that the volume ratio of the amount of air supplied to the two-fluid nozzle (21) and the amount of water supplied to the two-fluid nozzle (21) is 20 or more and 200 or less. A control unit (4a),
The spray mechanism control unit (4a), when increasing the spray amount of water from the two-fluid nozzle (21), executes a control to increase the amount of water after increasing the amount of air ,
The two-fluid nozzle (21) includes a spray unit (51) that sprays water containing a large number of bubbles to the outside.
The said spraying part (51) is an air conditioner which sprays the water refined | miniaturized by the expansion | swelling of the said bubble by a pressure difference .   The said spray mechanism control part (4a) performs control which decreases the amount of air, after reducing the amount of water, when decreasing the amount of spray of the water from the said 2 fluid nozzle (21). Air conditioner.

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