WO2008072593A1

WO2008072593A1 - Heat exchanger and air conditioner having heat exchanger

Info

Publication number: WO2008072593A1
Application number: PCT/JP2007/073771
Authority: WO
Inventors: Takashi Doi; Atsushi Nojiri; Sachiko Yamaguchi
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-12-11
Filing date: 2007-12-10
Publication date: 2008-06-19
Also published as: JP2008145063A; TW200840987A

Abstract

Disclosed is a heat exchanger which can maintain an effect of inhibiting the proliferation of a bacterium over a prolonged period. The heat exchanger comprises an aluminum material (50), a corrosion-resistant chromate layer (60) and a hydrophilic resin layer (70). The aluminum material (50) is a base material for a fin (F) which is a constituent of the heat exchanger. The corrosion-resistant chromate layer (60) is formed on a surface layer of the aluminum material (50). The hydrophilic resin layer (70) is formed above the surface layer of the aluminum material (50) and directly on a surface layer of the corrosion-resistant chromate layer (60) and has an antibacterial and antifungal agent (71) carried therein. The amount of the antibacterial and antifungal agent (71) dissolved in water retained on the surface of the hydrophilic resin layer (70) varies in a temperature-dependent manner.

Description

Specification

Heat exchanger and air conditioner equipped with heat exchanger

Technical field

[0001] The present invention relates to a heat exchanger and an air conditioner including the heat exchanger.

Background art

Conventionally, heat exchangers of air conditioners have had problems such as unpleasant odors during operation and invisible bacteria scattered in the air due to the adhesion of molds and other bacteria to the surface. . In particular, when the indoor unit functions as a refrigerant evaporator, the operation is stopped with water adhering to the heat exchanger or immediately before the heat exchanger dries, and the operation is not resumed for a long time. In some cases, mold, etc. are likely to propagate on the fin surface of the heat exchanger.

On the other hand, for example, in Patent Document 1 shown below, the growth of fungi is suppressed by applying an antibacterial agent to the fins of the heat exchanger. In addition, in the heat exchanger described in Patent Document 1, the antibacterial agent applied to the fin is carefully selected to have a particle size of a predetermined size or less, and an antibacterial agent having low solubility in water is used. The anti-bacterial agent dissolves gradually to lower the elution rate, and the anti-bacterial / anti-fungal effect can be obtained continuously for a long time.

[0003] Further, for example, in the heat exchanger described in Patent Document 2 shown below, the antibacterial agent is provided in the lower corrosion-resistant layer rather than being provided in the hydrophilic layer that is the surface of the fin of the heat exchanger, By reducing the degree of direct contact with water and adjusting the amount of elution, the antibacterial and antifungal effect can be obtained continuously over a long period of time.

As described above, the problems described above are improved by improving the surface of the fins of the heat exchanger.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-1852

Patent Document 2: Japanese Patent Laid-Open No. 2006-78134

Disclosure of the invention

Problems to be solved by the invention [0004] However, in the heat exchanger of the air conditioner described in Patent Document 1 and Patent Document 2, the antibacterial agent comes out with the operation time, and the antibacterial agent provided near the surface is There is a problem that the air conditioner is used up quickly after the start of use. In this way, if the antibacterial agent is used up at an early stage, it will be complicated because it will be necessary to repeat maintenance frequently, such as reapplying the antibacterial agent or replacing the heat exchanger.

The present invention has been made in view of the above-described points, and an object of the present invention is to provide a heat exchanger capable of maintaining the effect of suppressing the generation of mold bacteria for a long period of time and an air equipped with the heat exchanger. It is to provide a harmony device.

Means for solving the problem

[0005] The heat exchanger of the air conditioner according to the first invention includes a fin substrate and a coating layer. The coating layer is formed on the surface layer side of the fin substrate and contains an eluent. The eluent has temperature dependence on the amount of elution with respect to water, and is at least one of an antibacterial agent, an antifungal agent and an antibacterial and antifungal agent.

Here, it becomes possible to control the elution amount of the eluent according to the temperature change of the heat exchanger that changes corresponding to the operation of the air conditioner.

Thereby, by controlling the elution amount of the eluent, it becomes possible to stably maintain the effect of suppressing the generation of bacteria for a long period of time.

[0006] The heat exchanger of the air conditioner according to the second invention is the heat exchanger of the air conditioner according to the first invention, wherein the eluent is 40 ° more than the elution amount for water at 20 ° C. The amount of elution from C in water is 1.5 times greater.

Here, in particular, the amount of elution can be changed within the temperature range of the heat exchanger that changes when the air conditioner is operated.

This makes it possible to control the elution amount of the eluent while using the existing air conditioning operation control.

[0007] The heat exchanger of the air conditioner according to the third invention is the heat exchanger of the air conditioner according to the first invention or the second invention, wherein the coating layer has a hydrophilic agent. . The eluent is supported on the fin substrate via at least a hydrophilic agent. The eluent may be supported on the fin substrate via another substance other than the hydrophilic agent. This eluent is 20 ° C The amount of elution from the coating layer into water at 40 ° C is 1.5 times greater than that from the coating layer in water.

Here, the eluent is carried on the hydrophilic agent of the coating layer, and the vicinity of the surface of the coating layer can be kept water-retained by the property of the hydrophilic agent. And the eluent currently carry | supported by the coating-film layer can be eluted from the part which is in a water retention state. In addition, the temperature range of 20 ° C to 40 ° C can be easily included in the temperature change range of the heat exchanger when operating the air conditioner. Change more than 5 times.

This makes it possible to effectively control the elution amount of the eluent by using the change in the temperature of the heat exchanger when operating the air conditioner.

In addition, for example, the effect of the eluent itself on the elution amount with respect to the temperature depends not only on the temperature dependence, but also the selection of the eluent agent and the fine particle size while adjusting the coating layer on which the eluent is supported. It is also possible to synergize the effect of increasing the amount of elution using the fact that the pores of the swell expand with increasing temperature. This makes it possible to further improve the elution amount of the eluent.

[0008] A heat exchanger for an air conditioner according to a fourth invention is a heat exchanger for an air conditioner according to any of the first to third inventions, wherein the eluent contains at least zinc pyrithione. .

Here, even when a drug containing zinc pyrithione is used as an eluent, it is possible to suppress the generation of bacteria over a long period of time.

[0009] An air conditioner according to a fifth aspect of the present invention includes a heat exchanger of the air conditioner according to any of the first to fourth aspects of the invention, and an elution that increases the temperature of the heat exchanger by operating control of the refrigeration cycle. A control unit that performs control.

Here, by controlling the operation of the refrigeration cycle by the elution control by the control unit, the temperature of the heat exchanger can be increased by increasing the temperature of the refrigerant flowing through the heat exchanger. Thus, by performing elution control for increasing the temperature of the heat exchanger, it becomes possible to control the elution amount of the eluent.

[0010] An air conditioner according to a sixth aspect of the present invention is the air conditioner according to the fifth aspect of the present invention, wherein the controller is As the integrated operation time for elution control becomes longer, the time taken for elution control is lengthened.

Here, the elution agent in the coating layer gradually decreases by each elution control, and the elution amount per unit time decreases. However, the control unit performs control to increase the time required for elution control as the accumulated operation time becomes longer.

Thereby, stable elution can be performed for a long time.

[0011] An air conditioner according to a seventh aspect is the air conditioner according to the fifth aspect or the sixth aspect, wherein the control unit performs the elution control for the elution control as the integrated operation time for the elution control becomes longer. Increase the temperature range of the heat exchanger to be raised.

Here, the elution agent in the coating layer gradually decreases by each elution control, and the elution amount per unit time decreases. However, the control unit performs control to increase the temperature rise of the heat exchanger in the elution control as the accumulated operation time becomes longer.

Thereby, stable elution can be performed for a long time.

By making both the sixth invention and the seventh invention compatible, the control for increasing the temperature rise of the heat exchanger in the elution control is performed while increasing the time required for the elution control as the accumulated operation time becomes longer. And more stable elution can be performed for a long time.

[0012] An air conditioner according to an eighth aspect of the present invention is the air conditioner according to any of the fifth aspect to the seventh aspect of the present invention, further comprising a receiving unit that receives a predetermined signal. The control unit performs elution control when the reception unit receives a predetermined signal. Here, receiving the predetermined signal by the receiving unit includes, for example, receiving the predetermined signal by pressing a predetermined button of a controller serving as the receiving unit by the user.

Here, when the user desires the elution control, the elution control can be automatically started only by allowing the reception unit to receive a predetermined signal.

[0013] An air conditioner according to a ninth invention is the air conditioner according to any one of the fifth to seventh inventions, wherein the control unit performs elution control after the cooling operation of the refrigeration cycle.

Here, the control unit performs control so that the elution control is performed after the cooling operation in which the condensed water is held in the fins of the heat exchanger. As a result, the temperature of the heat exchanger is raised while the condensed water is held in the heat exchanger, so that effective elution can be performed.

[0014] An air conditioner according to a tenth aspect of the present invention is the air conditioner according to any of the fifth to seventh aspects of the present invention, wherein the control unit performs the melting after the accumulated operation time of the refrigeration cycle exceeds a predetermined time. Performs output control.

Here, the control unit performs elution control in a state where the accumulated operation time of the refrigeration cycle exceeds a predetermined time and bacteria and mold are expected to increase to some extent on the fins of the heat exchanger.

This makes it possible to effectively suppress the growth of bacteria, mold, and the like on the surface of the fins of the heat exchanger by repeating the elution control every accumulated operation time.

In addition, by making the ninth invention and the tenth invention compatible, elution control may be performed when, for example, the accumulated operation time related to the cooling operation exceeds a predetermined time.

[0015] An air conditioner according to an eleventh aspect of the present invention is the air conditioner according to any of the fifth to tenth aspects of the present invention, further comprising a blower fan that blows air to the heat exchanger. The control unit performs air blowing control by the air blowing fan after the elution control.

Here, the concentration of the eluted eluent can be increased by evaporating and drying the condensed water.

This makes it possible to actively create a situation with an elution concentration that exceeds the minimum inhibitory concentration for killing bacteria and fungi.

[0016] An air conditioner according to a twelfth aspect of the present invention is the air conditioner according to any of the fifth to eleventh aspects of the invention, wherein the control unit causes the heat exchanger to evaporate the refrigerant immediately before the elution control is performed. If it is operated as a heat exchanger! /, !!, in some cases, the heat exchanger is operated as a refrigerant evaporator before performing elution control.

Here, just before the elution control is performed, the heat exchanger is operated as a refrigerant condenser. In this case, there is a possibility that the fins of the heat exchanger do not hold water, and the eluent is eluted. Ability to do S Can't!

On the other hand, in the air conditioner of the twelfth aspect of the invention, the control unit performs control to operate the heat exchanger as a refrigerant evaporator before performing elution control. \ Refrigerant flowing inside heat exchanger The temperature is low and the state can be obtained.

As a result, a state in which the heat exchanger holds the condensed water can be created, and the eluent can be eluted.

[0017] An air conditioner according to a thirteenth aspect of the present invention is the air conditioner according to the twelfth aspect of the present invention, wherein the controller is operated immediately before the elution control is performed! The heat exchanger operates as a refrigerant condenser. If this happens, the heat exchanger is made to function as a refrigerant evaporator before the elution control is performed while the air flow to the room is interrupted.

If the heat exchanger is caused to function as a refrigerant evaporator during the heating operation, if air is blown, cold air is sent out to the room.

On the other hand, in the air conditioner of the thirteenth aspect of the invention, when the heat exchanger is operated as a refrigerant evaporator, the ventilation to the room is interrupted.

This makes it possible to create a state in which the heat exchanger that does not give the user discomfort holds the condensed water.

The invention's effect

[0018] In the heat exchanger of the air conditioner of the first invention, it is possible to stably maintain the effect of suppressing the generation of bacteria by controlling the elution amount of the eluent.

In the heat exchanger of the air conditioner of the second invention, it becomes possible to control the elution amount of the eluent while utilizing the existing air conditioning operation control.

In the heat exchanger of the air conditioner of the third invention, it becomes possible to effectively control the elution amount of the eluent by utilizing the change in the temperature of the heat exchanger when operating the air conditioner. In the heat exchanger of the air conditioner of the present invention, even when zinc pyrithione is used as the eluent, it is possible to suppress the generation of fungus bacteria over a long period of time. In the air conditioner according to the fifth aspect of the present invention, the elution amount of the eluent can be controlled by performing elution control for increasing the temperature of the heat exchanger.

In the air conditioner of the sixth aspect of the invention, stable elution can be performed for a long time.

In the air conditioner of the seventh aspect, stable elution can be performed for a long time. In the air conditioner of the eighth aspect of the invention, when the user desires elution control, a predetermined signal is received. Elution control can be started automatically just by accepting it from the attachment.

In the air conditioner according to the ninth aspect of the invention, since the temperature of the heat exchanger is raised while the condensed water is held in the heat exchanger, effective elution can be performed.

In the air conditioner according to the tenth aspect of the present invention, it is possible to effectively suppress the growth of bacteria, mold, etc. on the surface of the fins of the heat exchanger by repeating the elution control every accumulated operation time.

In the air conditioner according to the eleventh aspect of the present invention, it is possible to actively create a situation with an elution concentration exceeding the minimum growth inhibition concentration for killing bacteria and mold.

[0020] In the air conditioner of the twelfth aspect of the invention, the heat exchanger can create a state in which condensed water is retained, and the eluent can be eluted.

In the air conditioner according to the thirteenth aspect of the present invention, it is possible to create a state in which the heat exchanger that does not cause discomfort to the user holds condensed water.

Brief Description of Drawings

FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of the air conditioner.

FIG. 3 is a side sectional view of the indoor unit.

FIG. 4 is a control block diagram of the air conditioner.

FIG. 5 is a view showing a fin configuration of a heat exchanger.

FIG. 6 is a graph showing the difference in the amount of antibacterial and antifungal agent eluted from the fins of the heat exchanger.

FIG. 7 is a diagram showing the flow of antibacterial treatment control.

[FIG. 8] (a) A graph showing the temperature change of the heat exchanger. (B) A graph showing changes in the amount of condensed water on the fin surface. (c) is a graph showing changes in the concentration of the antibacterial and antifungal agent on the fin surface.

FIG. 9 is a graph showing the secular change of the remaining amount of antibacterial and antifungal agent.

[Fig. 10] Graph showing the relationship between the remaining amount of antibacterial and antifungal agent and the amount of dissolution at different temperatures.

FIG. 11 is a view showing a fin configuration of a heat exchanger according to Modification (B).

FIG. 12 (a) is a diagram showing a configuration of a resinous hydrophilic layer of a fin of a conventional heat exchanger. (b) Subordinate It is a figure which shows the initial state in the resin-type hydrophilic layer of the fin of the conventional heat exchanger. (C) It is a figure which shows the structure after the middle period of the resin-type hydrophilic layer of the fin of the conventional heat exchanger.

Explanation of symbols

[0022] 1 Indoor unit

2 Outdoor unit

5 Refrigerant communication piping

8 Control unit

10 Indoor heat exchanger

11 Indoor fan (fan)

20 Outdoor heat exchanger

100 air conditioner

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of an air conditioner according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, an air conditioner 100 in which an embodiment of the present invention is employed includes an indoor unit 1 installed on an indoor wall surface and an outdoor unit 2 installed outdoors. The main controller 30 can transmit signals to the control board part (not shown) of the indoor unit 1. The indoor unit 1 and the outdoor unit 2 contain heat exchangers, respectively. A refrigerant circuit is configured by connecting the exchangers through the refrigerant pipe 5.

The configuration of the refrigerant circuit of the air conditioner 100 is shown in FIG.

This refrigerant circuit mainly includes an indoor heat exchanger 10, an accumulator 21, a compressor 22, a four-way switching valve 23, an outdoor heat exchanger 20, and an expansion valve 24.

[0024] (Indoor unit 1)

The indoor heat exchanger 10 provided in the indoor unit 1 exchanges heat with the air in contact therewith. Here, the indoor heat exchanger 10 has fins as shown in FIG. 3 which is a side view of the indoor unit 1. It is an and tube type, and is configured by a front heat exchanger 10f disposed in front of the indoor unit 1 and a rear heat exchanger 10b disposed in the rear.

Further, the indoor unit 1 is provided with a cross flow fan 11 for sucking indoor air and passing the air through the indoor heat exchanger 10 to discharge the air into the room. The cross flow fan 11 is driven to rotate by one indoor fan motor 12 provided in the indoor unit 1. As shown in FIG. 3, the indoor heat exchanger 10, the cross flow fan 11, and the like are arranged in the indoor unit casing 4.

[0025] The indoor unit casing 4 is provided with a suction port 42 at the front and upper sides and a blow-out port 49 at the lower side. The air outlet 49 is provided with a flap 47 whose electric opening can be electrically controlled. Further, as shown in FIG. 3, the indoor unit casing 4 is provided with a front panel 41 on the front side and an installation plate 43 on the back side. Inside the installation plate 43, a rear frame 44 that supports the rear heat exchanger 10b, the rotating shaft portion of the cross flow fan 11, and the like is disposed!

The front heat exchanger 10f and the rear heat exchanger 10b of the indoor heat exchanger 10 are positioned between the suction port in the indoor unit casing 4 and are bent at multiple stages so as to surround the cross flow fan 11. Arranged!

In the indoor unit 1, when the crossflow fan 11 is driven to rotate, the indoor air (V floating in the air, part of the floating pollutant is not shown in the figure, removed by a pre-filter) is moved forward and upward. The conditioned air that has been taken in through the indoor heat exchanger 10 through 42 and exchanged heat is returned to the room to air-condition the target space.

[0026] Below the front lower end of the front heat exchanger 10f, when the indoor heat exchanger 10 functions as a refrigerant evaporator in the refrigeration cycle, moisture in the air is cooled and condensed on the surface. Since water adheres, a front drain pan 45 that captures condensed water in the air generated in the front heat exchanger 1 Of is provided. In addition, a rear drain pan 46 is provided below the rear lower end of the rear heat exchanger 10b to capture condensed water in the air generated in the rear heat exchanger 10b.

(Outdoor unit 2)

The outdoor unit 2 includes a compressor 22, a four-way switching valve 23 connected to the discharge side of the compressor 22, and a pressure An accumulator 21 connected to the suction side of the compressor 22, a fin-and-tube outdoor heat exchanger 20 connected to the four-way selector valve 23, and an expansion valve 24 connected to the outdoor heat exchanger 20 Is provided. The expansion valve 24 is connected to a pipe via a liquid closing valve 26, and is connected to one end of the indoor heat exchanger 10 via this pipe. The four-way selector valve 23 is connected to a pipe via a gas closing valve 27 and is connected to the other end of the indoor heat exchanger 10 via this pipe. Further, the outdoor unit 2 is provided with a propeller fan 28 for discharging the air after heat exchange in the outdoor heat exchanger 20 to the outside. The propeller fan 28 is rotationally driven by an outdoor fan motor 29.

[0027] <Controller 30>

As shown in FIG. 1 and FIG. 4 which is a control block diagram, the controller 30 relates to various operation modes and the like with respect to the control board (not shown) of the indoor unit 1 constituting a part of the control unit 8. It is provided to transmit a signal to be transmitted. The control board of the indoor unit 1 is provided with a CPU, ROM, RAM, etc. (not shown), and similarly the CPU, ROM, and RAM are provided to control the outdoor unit 2 that constitutes a part of the control unit 8. It is connected to a substrate (not shown). In this way, the control unit 8 is configured by the control board of the indoor unit 1 and the control board of the outdoor unit 2. The controller 30 controls each component device that sends out the refrigerant flowing through the refrigerant circuit described above so as to perform cooling operation, heating operation, and air blowing operation, and performs various controls such as antibacterial treatment control described later. In addition, an input button 31 for receiving a command from the user is provided.

In addition, as shown in FIG. 4, the control unit 8 determines the number of rotations of the indoor fan motor 12, the opening degree of the flap 47, the connection state of the four-way switching valve 22, the outdoor fan, according to various operation modes. The number of rotations of the motor 29 and the driving state of the compressor 22 can be controlled.

FIG. 5 shows a schematic configuration of the fin F of the indoor heat exchanger 10 that is the fin-and-tube type of the present embodiment. As shown in the schematic cross-sectional view of FIG. 5, the fin F is configured by laminating a chromate corrosion-resistant layer 60, a resin-based hydrophilic layer 70, and an antifouling layer 80 in this order on the aluminum material 50. Yes.

The resin-based hydrophilic layer 70 of the fin F is made of an acrylic resin or the like as a resin-based hydrophilic agent. It is made. The acrylic resin of the resin-based hydrophilic layer 70 carries a drug containing zinc pyridione as the antibacterial and antifungal agent 71. The resin-based hydrophilic layer 70 is formed to have a thickness of about 1.0 micrometers.

[0029] The resin-based hydrophilic agent is not limited to an acrylic resin, and may be, for example, zeolite, polybulal alcohol, nylon, or the like. Further, the antibacterial and antifungal agent 71 is prepared so as not to be secondary agglomerated (so as not to agglomerate tertiary) and is supported in an acrylic resin or the like.

Further, the antibacterial and antifungal agent 71 is not limited to a drug containing zinc pyrithione. For example, a drug containing sodium zinc pyrithione may be used, and alcohol, phenol, aldehyde, carboxylic acid, Ester, ether, nitrile, peroxide, 'epoxy, halogen, pyridine' quinoline, triazine, isothiazolone, imidazole thiazole, anilide, hyguanide, dysnoureido, thiocarbonate Drugs containing carbohydrates, trobolones, surfactants, organometallics, etc. may be used.

Note that the chromate layer 60 is provided to fix the resin-based hydrophilic layer 70 carrying the antibacterial and antifungal agent 71 to the aluminum material 50.

The antifouling layer 80 is provided on the surface layer side of the resin-based hydrophilic layer 70, and has the property of being able to be washed / washed with water even if dirt that is difficult to adhere is attached.

(Temperature characteristics of fin F)

In addition, the fin F of the present embodiment is selected so that the amount of the antibacterial and antifungal agent 71 dissolved in water has temperature dependency. Furthermore, for the fin F of the present embodiment, a drug that minimizes the amount of elution at 20 ° C. or lower and minimizes the amount of elution at 40 ° C. or higher is selected.

Fig. 6 shows the amount (g / 1) of the antibacterial / antifungal agent 71 dissolved in water according to the temperature. The difference is shown.

[0031] Conventional antibacterial and antifungal agents have little change in the amount of elution even when the temperature of the aqueous solution is different.

In contrast, the antibacterial and antifungal agent 71 of the present embodiment has an elution amount at 20 ° C and a dissolution at 40 ° C. In terms of output, it is a local increase of approximately 1.5 to 1.7 times.

In addition, comparing the elution amount of the conventional antibacterial and antifungal agent at 20 ° C and the elution amount of the antibacterial and antifungal agent of this embodiment, the antibacterial and antifungal agent 71 of this embodiment keeps the elution amount lower than before. That power S. Furthermore, when the elution amount of the conventional antibacterial and antifungal agent at 40 ° C is compared with the elution amount of the antibacterial and antifungal agent of this embodiment, the antibacterial and antifungal agent 71 of this embodiment shows a difference at 20 ° C. It has shrunk significantly.

Further, in the above-described resin-based hydrophilic layer 70, when the temperature rises from 20 ° C. to 40 ° C., the pore size of the resin-based hydrophilic agent carrying the antibacterial / antifungal agent 71 expands and becomes large. Become. For this reason, the antibacterial and antifungal agent 71 has a unique synergistic effect with the increase in the amount of elution based on the properties of the resinous aquatic layer 70, which is not only due to the temperature dependency, but also the amount of elution at 20 ° C and 40 ° C. Each is selected and prepared so that there is a clear difference in the amount of elution in C.

[0032] Hereinafter, control of the elution concentration of the antibacterial / antifungal agent 71 on the fin F (antibacterial treatment control) will be described.

The user can start the antibacterial treatment control by pressing the input button 31 of the controller 30 described above. That is, when receiving an instruction to perform antibacterial treatment control via the controller 30, the control unit 8 starts the antibacterial treatment control by controlling the indoor unit 1 and the outdoor unit 2.

Fig. 7 shows the flow of antibacterial treatment control (the state of the surface of the fin F and the time change of the state of various components). In addition, a graph showing the temperature change of the heat exchanger corresponding to the time change is shown in Fig. 8 (a), a graph showing the change in the amount of condensed water on the surface of Fin F, and Fig. 8 (b), the antibacterial surface on Fin F surface. The graphs showing changes in the concentration of the fungicide 71 are shown in Fig. 8 (c).

[0033] Here, the cooling operation is performed so that the indoor heat exchanger 10 functions as a refrigerant evaporator in the refrigeration cycle and starts from a state in which condensed water is attached to the surface of the indoor heat exchanger 10. Will be described. In addition, when the indoor heat exchanger 10 immediately before the antibacterial treatment control is not functioning as a refrigerant evaporator, there is insufficient moisture on the fin F, If the fungicide 71 cannot be eluted, the indoor fan 11 is stopped and the indoor heat exchanger 10 is once functioned as a refrigerant evaporator to condense the fin F surface. You can control the operation so that it gets wet with water!

At the start of this antibacterial treatment control, most of the antibacterial and antifungal agent 71 eluted to the condensed water is washed away as condensed water, and the concentration of the surface of the fin F is low as shown in Fig. 8 (c). It is in a state.

[0034] In the antibacterial treatment control, the control unit 8 first performs the air blowing operation to stop the operation of the compressor 22 while controlling the air volume of the indoor fan 11 to be W2.

Next, the control unit 8 stops the operation of the indoor fan 11, starts the operation of the compressor 22, and performs the heating operation so that the temperature of the indoor heat exchanger 10 becomes about 43 to 45 ° C. Here, the operation of the indoor fan 11 was stopped in an environment where the cooling operation was performed until the antibacterial treatment control was performed, and it was assumed that the user wanted to cool the room. This is because it is not necessary to send warm air into the room. Here, as the temperature of the indoor heat exchanger 10 increased to S43 ~ 45 ° C, the amount of condensed water on the surface of the fin F decreased rapidly as shown in Fig. 8 (b), and Fig. 8 (c) As shown in Fig. 5, the dissolution amount of the antibacterial and antifungal agent 71 increases rapidly, and the dissolution concentration increases rapidly.

[0035] Then, the control unit 8 performs control to stop the operation of the indoor fan 13 and the operation of the compressor 22 and maintain the stopped state.

When the stop control is finished, the control unit 8 performs the heating operation again, stops the operation of the indoor fan 11, and operates the compressor 22, so that the temperature of the indoor heat exchanger 10 becomes 43 to 45 ° C. Control so that Again, as the temperature of the indoor heat exchanger 10 rose to 43-45 ° C, the amount of condensed water on the surface of the fin F rapidly decreased again as shown in Fig. 8 (b), and Fig. 8 (c As shown in (), the dissolution amount of the antibacterial and antifungal agent 71 increases rapidly, and the dissolution concentration rapidly increases and exceeds the MIC value (minimum growth element concentration). With this, the force S kills bacteria and mold on the surface of Fin F.

Then, the control unit 8 stops the operation of the indoor fan 11 and the compressor 22 again, and performs stop control. As a result, the condensed water on the surface of the fin F evaporates and the elution concentration gradually increases. [0036] Here, the control unit 8 operates the compressor 22 to perform the heating operation so that the temperature of the indoor heat exchanger 10 is 5; Drive at a weak level of M. As a result, the condensed water on the surface of Fin F evaporates all at once, the elution concentration further increases, and there is almost no bacteria and mold on the surface of Fin F. Here, since the indoor fan 11 is operated and warm air is sent out indoors, the room temperature rises. 1S The air blowing operation is stopped by increasing the time of the second air blowing operation, etc. May be.

(1)

In a conventional heat exchanger, when an antibacterial and anti-bacterial agent is provided, primary aggregation, secondary aggregation, tertiary aggregation, etc. occur, and are supported with an average particle size increased. For this reason, the antifungal agent has a large surface area exposed on the surface layer, and when it adheres to condensed water isostatic S fins, most of it has been dissolved out in a relatively short period of time. . For this reason, it is difficult to stably maintain elution over a long period of time, and it is impossible to stably maintain the antibacterial and antifungal function.

[0037] In the conventional heat exchanger, for example, as shown in Fig. 12 (a), the antibacterial and antifungal agent 971 is configured to be concentrated and supported on the lower layer side of the resin-based hydrophilic layer 970. There is. However, in such a conventional heat exchanger, as shown in FIG. 12 (b), water penetrates into the inside of the resin-based hydrophilic layer 970 through a portion having a hygroscopic function such as a sponge, All of the antibacterial and antifungal agent 971 carried on the soaked part elutes in a short period of time. As a result, as shown in FIG. 12 (c), only the antibacterial and antifungal agent 971 present in the portion having no hygroscopic function remains, and the antibacterial and antifungal function can be exhibited in the long term. Can not.

On the other hand, the fin F of the indoor heat exchanger 10 of the air conditioner 100 of the above embodiment can control the amount of the antibacterial / antifungal agent 71 dissolved in the condensed water so that the antibacterial / antifungal agent 71 can be controlled. In order to prevent secondary agglomeration, etc., the particles are supported in a well-balanced state without being collected on the lower layer side of the resinous lyophilic agent while maintaining a state where the average particle size is small. For this reason, it is necessary only to kill bacteria and mold (beyond the minimum inhibitory concentration). The amount of the antibacterial / antifungal agent 71 can be adjusted as much as necessary, and the antibacterial / antifungal agent 71 can be prevented from flowing out. As a result, the effect of suppressing the generation of fungi can be stably maintained for a long time.

[0038] (2)

In the fin F of the indoor heat exchanger 10 of the air conditioner 100 of the above embodiment, the resin-based hydrophilic layer on which the antibacterial / antifungal agent 71 is supported simply by utilizing the elution temperature characteristics of the antibacterial / antifungal agent 71 itself. The elution amount of the antibacterial and antifungal agent 71 can be controlled by utilizing the degree of expansion of the pore size of the resinous hydrophilic agent 70 due to the temperature. As a result, only using the temperature change of the indoor heat exchanger 10 by the existing operation control of the air conditioner 100 such as the cooling operation or the air blowing operation such as the cooling operation can be performed between 20 ° C and 40 ° C. In order to obtain a composition in which the amount of elution is 1.7 times different, the force S is used.

As described above, the specific configurations of the embodiments of the present invention based on the drawings are not limited to these embodiments, and can be changed without departing from the gist of the present invention as follows.

[0039] (A)

In the above embodiment, the configuration of the fin F in the indoor heat exchanger 10 provided in the indoor unit 1 of the air conditioner 100 has been described with an example.

However, the present invention is not limited to this, and the configuration of the heat exchanger described above may be applied to, for example, the fins F of the outdoor heat exchanger 20 of the outdoor unit 2.

(B)

In the fin F of the indoor heat exchanger 10 of the air conditioner 100 of the above embodiment, as shown in FIG. 5, the fin F having a configuration in which the antibacterial and antifungal agent 71 is contained only in the resin-based hydrophilic layer 70 is taken as an example. Explained.

However, the present invention is not limited to this. For example, as shown in FIG. 11, the antibacterial and antifungal agent 71 is not only the resin hydrophilic layer 70 but also the resin lubricant 90 provided on the surface layer. It is good also as the structure contained. This layer containing the resin-based lubricant 90 ensures slippage in the state where the two fins F are in contact with each other, thereby improving the manufacturability of the heat exchanger. And force S. The resin-based lubricant 90 flows down along with the drain water by obtaining condensed water in the first cooling operation.

[0040] (C)

In the above-described embodiment, the indoor heat exchanger 10 provided in the indoor unit 1 of the air conditioner 100 performs operation control that causes the indoor heat exchanger 10 to function as a refrigerant evaporator while stopping the driving of the indoor fan 11. As an example, the case where the moisture in the air is condensed and the surface of the fin F is wetted by the condensed water is explained.

However, the present invention is not limited to this. As a method for creating a state in which the surface of the fin F is wet with water in order to elute the antibacterial and antifungal agent 71, for example, a water supply source is provided in advance. It also includes an air conditioner that can be configured to perform processing such as spraying or dripping on the fin F when necessary.

Here, as the water supply source, for example, it may be configured like a tank in which water is put in advance! /, Or it may be configured such that tap water is guided! /.

[0041] Furthermore, the drain water generated in the operation of the air conditioner 100 may be received by a drain pan, and the water obtained by receiving the drain pan may be used as a supply source.

(D)

In the above-described embodiment, the indoor heat exchanger 10 provided in the indoor unit 1 of the air conditioner 100 has been described by taking as an example a configuration that carries the antibacterial and anti-bacterial agent 71.

However, the present invention is not limited to this, and the antibacterial / antifungal agent 71 may be replenished by spraying a solution in which the antibacterial / antifungal agent is dissolved from the outside.

In addition, to prevent the growth of bacteria on the surface of the heat exchanger, spray a solution containing the antibacterial and antifungal agent 71 on the heat exchanger that does not have the antibacterial and antifungal agent 71 from the beginning. It may be.

[0042] (E)

In the above embodiment, in the indoor heat exchanger 10 provided in the indoor unit 1 of the air conditioner 100, as the antibacterial treatment control is repeatedly performed, it is carried on the resin-based hydrophilic layer 70 as shown in FIG. The amount of antibacterial and antifungal agent 71 decreases. And in this way antibacterial strength Even if the loading amount of the bi-agent 71 decreases, the antibacterial treatment control is performed when the accumulated operating time of the cooling operation exceeds the predetermined time to maintain the elution amount stably! When the inner heat exchanger 10 is caused to function as a refrigerant condenser, the temperature of the indoor heat exchanger 10 may be controlled to be further increased, and control for securing an elution amount may be performed.

Specifically, as shown in FIG. 10, when the remaining amount of the antibacterial and antifungal agent 71 is less than 30%, in order to obtain an elution amount that exceeds the MIC value, the indoor heat exchanger 10 It will be necessary to heat.

[0043] Instead of heating the indoor heat exchanger 10, a longer elution time may be provided.

Industrial applicability

[0044] If the present invention is used, the effect of suppressing the occurrence of mold bacteria can be maintained for a long time, and therefore, it can be applied particularly to the surface configuration of the fins of the heat exchanger of the air conditioner.

Claims

The scope of the claims

[1] A heat exchanger (10, 20) for an air conditioner,

The fin substrate (50);

A coating film formed on the surface layer side of the fin substrate (50) and including an eluent having at least one of an antibacterial agent, an antifungal agent, and an antibacterial and antifungal agent (71), and an eluent having a temperature dependency on an elution amount with respect to one water Layer (70),

Air conditioner heat exchanger with (10, 20).

[2] The eluent (71) has an elution amount for water at 40 ° C that is 1.5 times greater than that for water at 20 ° C.

The heat exchanger (10, 20) of the air conditioner according to claim 1.

[3] The coating layer (70) has a hydrophilic agent,

The eluent is supported on the fin substrate (50) through at least the hydrophilic agent, and at 20 ° C., the elution amount at 40 ° C. is higher than the elution amount eluted from the coating layer (70) into water. The heat exchanger (10, 20) for an air conditioner according to claim 1 or 2, wherein the amount of elution from the coating layer (70) into water is 1.5 times or more larger.

[4] The eluent contains at least zinc pyrithione.

The heat exchanger (10, 20) of any one of claims 1 to 3, the air conditioner according to claim 1.

[5] The power of any one of claims 1 to 4, the heat exchanger (10, 20) of the air conditioner according to claim 1, and elution control for increasing the temperature of the heat exchanger by operating control of the refrigeration cycle. Control unit (8),

An air conditioner (100) comprising:

[6] The control unit (8) increases the time taken for the elution control as the integrated operation time for the elution control becomes longer.

The air conditioner (100) according to claim 5.

[7] The control unit (8) increases the temperature range of the heat exchanger to be increased in the elution control as the integrated operation time for the elution control becomes longer.

The air conditioner (100) according to claim 5 or 6.

[8] A reception unit (31) for receiving a predetermined signal is further provided, The control unit (8) performs the melting control when the receiving unit (31) receives the predetermined signal.

The air conditioner (100) according to any one of claims 5 to 7, wherein the air conditioner (100).

The air conditioner (100) according to any one of claims 5 to 7, wherein the control unit (8) performs the elution control after cooling operation of the refrigeration cycle.

The controller (8) performs the elution control after the accumulated operation time of the refrigeration cycle exceeds a predetermined time.

The air conditioner (100) according to any one of claims 5 to 9, wherein the air conditioner (100).

A fan (11) for blowing air to the heat exchanger,

The air conditioner according to any one of claims 5 to 10, wherein the control unit (8) performs air blowing control by the air blowing fan after the elution control.

In the operation immediately before performing the elution control, the control unit (8) is operated as a refrigerant evaporator! /, NA! /, In the case where the heat exchanger is operated before performing the elution control. Operating the heat exchanger as a refrigerant evaporator,

The air conditioning apparatus (100) according to any one of claims 5 to 11, wherein the air conditioning apparatus (100).

When the heat exchanger is operated as a refrigerant condenser in the operation immediately before performing the elution control, the control unit (8) is configured to stop the air blowing to the room and perform the elution control. 13. The air conditioner according to claim 12, wherein the heat exchanger functions as a refrigerant evaporator.