JP4259572B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger for an air conditioner.

  Conventionally, in a heat exchanger of an air conditioner, there is a problem that mold, bacteria, or the like adheres to the surface, causing unpleasant odors during operation or invisible bacteria to be scattered in the air. In particular, when the indoor unit functions as a refrigerant evaporator, moisture tends to adhere to the heat exchanger, and the operation is stopped with water droplets attached before the heat exchanger dries, and the operation is not resumed for a long time. In some cases, mold, bacteria, etc. are likely to propagate on the surface of the heat exchanger fins.

  On the other hand, for example, in Patent Document 1 shown below, the growth of mold and bacteria 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 equal to or smaller than a predetermined size, and an antibacterial agent having low solubility in water is used. The antibacterial agent is gradually dissolved to lower the elution rate, so that the antibacterial and antifungal effects can be obtained continuously over a long period of time.

  Also, for example, in the heat exchanger described in Patent Document 2 shown below, the antibacterial agent is not provided in the hydrophilic layer that is the surface of the fin of the heat exchanger, but is provided in the lower corrosion-resistant layer, so On the other hand, the degree of direct contact is reduced, the amount of elution is adjusted, and the antibacterial / antifungal effect can be obtained continuously for a long time.

As described above, the above-described problems are improved by improving the surface of the fin of the heat exchanger.
JP 2006-1852 A JP 2006-78134 A

  However, in the heat exchanger of the air conditioning apparatus described in Patent Document 1 and Patent Document 2, these dusts attached on the assumption that dust, mold, bacteria, and the like adhere to the fin surface of the heat exchanger. However, only a technique for removing mold and bacteria is shown, and no technique for suppressing adhesion of dust, mold, bacteria, etc. is shown.

  This invention is made | formed in view of the point mentioned above, The subject of this invention is providing the heat exchanger of the air conditioning apparatus which can reduce adhesion of dust, mold, and bacteria.

The heat exchanger of the air conditioner according to the first aspect of the present invention includes a fin substrate, an antibacterial and antifungal layer, and a coating layer. The antibacterial / antifungal layer is formed on the surface layer side of the fin substrate, and includes any one of a water-soluble antibacterial agent, a fungicide, and an antibacterial / antifungal agent. The coating layer is formed on the surface side of the antibacterial and antifungal layer and includes an antifouling agent containing a switching agent having a hydrophilic group having hydrophilicity and a non-hydrophilic group having no hydrophilicity. And the switching agent of the antifouling agent has a non-hydrophilic group located on the surface side of the surface of the coating layer in the absence of water, and a non-hydrophilic group in the state of water on the surface of the coating layer. Since the hydrophilic group is located on the surface side, the binding force to the floating contaminant flying in the air is lower than the binding force to water. Here, the airborne pollutant flying in the air includes, for example, dust, bacteria, mold, protein-containing oily smoke, tobacco smoke, chemical substances, and the like.

  Here, the coating layer provided most on the surface layer is less likely to have airborne contaminants attached thereto. For this reason, it can be set as the state which does not have dirt on the surface of the fin of a heat exchanger. For this reason, since there is no dirt which blocks the elution of the antibacterial and antifungal agent, the antibacterial and antifungal agent can be stably eluted. Further, the coating layer contains an antifouling agent having a lower binding force with floating contaminants flying in the air than with water. For this reason, even if airborne contaminants adhere to the surface layer, when water comes in such as when the heat exchanger functions as an evaporator of the refrigerant, the antifouling agent is more water than bound with airborne contaminants. In order to prioritize the combination with, floating contaminants move away from the surface layer. For this reason, since the state which does not have dirt on the surface of the fin of a heat exchanger can always be maintained, the elution of an antibacterial and antifungal agent can be performed stably.

  Accordingly, it is possible to stably maintain the elution of the antibacterial / antifungal agent by avoiding the stay of dirt on the surface and exposing the antibacterial / antifungal agent.

Furthermore, when water comes in a state where dirt is attached to the coating layer, the non-hydrophilic group and the hydrophilic group are switched, so that the hydrophilic group appears on the surface layer and binds to water, thereby bringing the surface layer into a hydrophilic state. Can be removed.

  Thereby, the surface can be made difficult to get dirty.

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 non-hydrophilic group of the switching agent is a fluoroalkyl group.

Here, when water comes in a state where dirt is attached to the coating layer, the fluoroalkyl group and the hydrophilic group are switched, whereby the surface layer can be brought into a hydrophilic state and the dirt can be peeled off.

  Thereby, the surface can be made difficult to get dirty.

A heat exchanger for an air conditioner according to a third aspect of the present invention is the heat exchanger for an air conditioner according to the first or second aspect of the present invention, wherein the coating layer is subjected to fluorine processing, and fluorine is applied to the surface. Configured to be located.

A heat exchanger for an air conditioner according to a fourth invention is a heat exchanger for an air conditioner according to the first or second invention, wherein the switching agent is a (meth) acrylic acid ester containing a fluoroalkyl group. Selected from the group consisting of a copolymer of a hydrophilic group-containing compound, a (meth) acrylic acid ester further containing a hydroxyl group in the copolymer, and a copolymer of an alkyl (meth) acrylate At least one.

  Here, the coating layer is superior in dirt detachability, water repellency, oil repellency, and water repellency durability due to the relationship between dirt and water.

  As a result, it becomes possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

A heat exchanger for an air conditioner according to a fifth invention is the heat exchanger for an air conditioner according to the first invention or the second invention, wherein the switching agent is a (meth) acrylic acid ester having a fluoroalkyl group, At least one selected from the group consisting of a polyalkylene glycol (meth) acrylate, a (meth) acrylic acid ester having a hydroxyl group, and a copolymer containing structural units derived from alkyl (meth) acrylate or butadiene It is.

  Here, the coating layer is superior in dirt detachability, water repellency, oil repellency, and water repellency durability due to the relationship between dirt and water.

  As a result, it becomes possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

The air conditioner heat exchanger according to a sixth aspect of the present invention is the air conditioner heat exchanger according to the first or second aspect of the present invention, wherein the switching agent is an acrylic ester or methacrylic ester having a fluoroalkyl group. , Polyalkylene glycol acrylate, polyalkylene glycol methacrylate, 3-chloro-2-hydroxypropyl acrylate, 3-chloro-2-hydroxypropyl methacrylate, and molecular weight containing building blocks derived from glycerol monoacrylate or glycerol monomethacrylate It is at least one selected from the group consisting of 1000 to 500,000 copolymers.

  Here, the coating layer is superior in dirt detachability, water repellency, oil repellency, and water repellency durability due to the relationship between dirt and water.

  As a result, it becomes possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

A heat exchanger for an air conditioner according to a seventh aspect is the heat exchanger for an air conditioner according to any one of the first to sixth aspects, wherein the antibacterial and antifungal agent includes at least zinc pyrithione.

  Here, by using a drug containing zinc pyrithione as an antibacterial and antifungal agent and eluting it against condensed water, it is possible to reduce the adhesion of dust, mold and bacteria by making it exceed the minimum growth inhibitory concentration It becomes possible.

  In the heat exchanger of the air conditioner of the first invention, the elution of the antibacterial and antifungal agent is stably maintained by avoiding the stay of dirt on the surface and exposing the antibacterial and antifungal agent. Is possible.

  In the heat exchanger of the air conditioner of the second invention, the surface can be made difficult to get dirty.

  In the heat exchanger of the air conditioner according to the third aspect of the invention, the surface can be made difficult to get dirty.

  In the heat exchanger of the air conditioner according to the fourth aspect of the present invention, it is possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

  In the heat exchanger of the air conditioner according to the fifth aspect of the present invention, it is possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

  In the heat exchanger of the air conditioner according to the sixth aspect of the present invention, it is possible to maintain a state in which dirt does not easily adhere to the surface over a long period of time.

In the heat exchanger of the air conditioner according to the seventh aspect of the present invention, it is possible to reduce the adhesion of dust, mold and bacteria by setting a state exceeding the minimum growth inhibition concentration.

  Hereinafter, an embodiment of an air-conditioning apparatus according to the present invention will be described based on the drawings.

<Schematic configuration of air conditioner>
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 a wall surface in the room and an outdoor unit 2 installed outside the room, and a controller. 30 can transmit a signal to a control board portion (not shown) of the indoor unit 1.

  A heat exchanger is accommodated in each of the indoor unit 1 and the outdoor unit 2, and each heat exchanger is connected by a refrigerant pipe 5 to constitute a refrigerant circuit.

<Outline of configuration of refrigerant circuit of air conditioner 100>
The structure of the refrigerant circuit of the air conditioning apparatus 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.

(Indoor unit 1)
The indoor heat exchanger 10 provided in the indoor unit 1 performs heat exchange with the air in contact therewith. Here, as shown in FIG. 3 which is a side view of the indoor unit 1, the indoor heat exchanger 10 is a fin-and-tube type, and includes a front heat exchanger 10 f disposed in front of the indoor unit 1 and a rear side. It is comprised by the back heat exchanger 10b arrange | positioned.

  In addition, the indoor unit 1 is provided with a cross flow fan 11 for sucking indoor air, passing the air through the indoor heat exchanger 10, and discharging the air after the heat exchange is performed indoors. The cross flow fan 11 is rotationally driven 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 disposed in the indoor unit casing 4.

  The indoor unit casing 4 is provided with a suction port 42 on the front and upper sides, and an air outlet 49 on the lower side. 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 in multiple stages so as to surround the cross flow fan 11. Has been placed.

  In the indoor unit 1, when the cross flow fan 11 is driven to rotate, indoor air (a part of floating contaminants floating in the air is removed by a prefilter (not shown)) is passed through the front and upper suction ports 42. The conditioned air that has been taken in and passed through the heat exchanger 10 is returned to the room again to air-condition the target space.

  In addition, below the front lower end portion 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 water adheres to the surface. Therefore, a front drain pan 45 that captures condensed water of moisture in the air generated in the front heat exchanger 10f is provided. A rear drain pan 46 is provided below the rear lower end of the rear heat exchanger 10b to catch the condensed water in the air generated in the rear heat exchanger 10b.

(Outdoor unit 2)
The outdoor unit 2 is connected to a compressor 22, a four-way switching valve 23 connected to the discharge side of the compressor 22, an accumulator 21 connected to the suction side of the compressor 22, and a four-way switching valve 23. A fin-and-tube outdoor heat exchanger 20 and an expansion valve 24 connected to the outdoor heat exchanger 20 are 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 switching 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.

<Controller 30>
As shown in FIG. 1, the controller 30 is provided to transmit signals regarding various operation modes and the like to a control board (not shown) of the indoor unit 1. The control board of the indoor unit 1 is provided with a CPU, ROM, RAM, etc. (not shown), and similarly connected to the control board (not shown) of the outdoor unit 2 provided with the CPU, ROM, RAM. The control unit 8 is configured by both control boards. The controller 30 controls each component device that sends out the refrigerant flowing through the refrigerant circuit described above to perform cooling operation and heating operation, and performs various controls such as antibacterial treatment control described later. An input button 31 for receiving a command from is provided.

<Heat exchanger fins>
FIG. 4 shows a schematic configuration of the fins F of the indoor heat exchanger 10 of the present embodiment. As shown in the schematic sectional view of FIG. 4, 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. .

  Here, problems of the fins of the conventional heat exchanger will be described.

(Problems with conventional fins)
FIG. 5A shows the configuration of the fins of a conventional heat exchanger.

  The conventional heat exchanger is configured by sequentially laminating a chromate corrosion-resistant layer 960 and a resin-based hydrophilic layer 970 on an aluminum material 950. The antifouling layer 80 of this embodiment is not provided. Here, as shown in FIG. 5A, the conventional antibacterial and antifungal agent 971 causes primary aggregation, secondary aggregation, tertiary aggregation, and the like when it is supported on the resin-based hydrophilic layer 970. The average particle size has increased. Therefore, the antibacterial and antifungal agent 971 has a large surface area exposed on the surface layer, and when the heat exchanger functions as a refrigerant evaporator and the condensed water adheres to the fins, the antibacterial and antifungal agent 971 is eluted at once. For this reason, the antibacterial and antifungal function cannot be exhibited by long-term stable elution. Further, as shown in FIG. 6A, even when the antibacterial and antifungal agent 971 is supported on the lower layer side of the resinous hydrophilic layer 970, the resinous hydrophilic property as shown in FIG. In the layer 970, the antibacterial and antifungal agent 971 in which water is soaked through a portion having a hygroscopic function such as a sponge is eluted at a stretch. As a result, as shown in FIG. 6 (c), only the antibacterial / antifungal agent 971 present in the portion having no hydrophilic function remains, and the antibacterial / antifungal function cannot be exhibited in the long term. .

  Further, as shown in FIG. 5 (b), if a dirt film P is formed on the surface layer of the resin-based hydrophilic layer 970 and the antibacterial and antifungal agent 971, even if the condensed water W adheres to the upper layer, Since water does not reach the antibacterial / antifungal agent 971, the antibacterial / antifungal agent 971 cannot be eluted. Here, the dirt film P includes, for example, dust, bacteria, mold, protein-containing oily smoke, tobacco smoke, chemical substances, etc. floating in the indoor air.

  For this reason, as shown in FIG. 5C, the antibacterial and antifungal agent 971 cannot act effectively, and molds, bacteria, etc. are propagated by using proteins contained in oily smoke as a nutrient source. . Thereby, when the indoor unit 1 is driven, an unpleasant odor may be sent out indoors.

(Configuration of Fin F of Indoor Heat Exchanger 10)
Hereinafter, a configuration in the vicinity of the surface of the fin F of the indoor heat exchanger 10 of the fin and tube type will be described.

  FIG. 7 shows a schematic cross-sectional configuration of the fin F.

  The resin-based hydrophilic layer 70 of the fin F is configured using an acrylic resin or the like as a resin-based hydrophilic agent. The acrylic resin or the like of the resin-based hydrophilic layer 70 carries a medicine containing zinc pyridione as the antibacterial and antifungal agent 71. The film thickness of the resin-based hydrophilic layer 70 is formed to be about 1.0 micrometers.

  The resin-based hydrophilic agent is not limited to an acrylic resin, and may be, for example, zeolite, polyvinyl 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 be tertiary agglomerated) 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, and 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, disulfide, thiocarbonate, carbohydrate You may use the chemical | medical agent containing a system, a tropolone system, surfactant system, an organometallic system, etc.

  The chromate layer 60 is provided for fixing 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 side of the resin-based hydrophilic layer 70 and has a property that dirt is difficult to adhere and can be washed away with water even if dirt is attached. The antifouling layer 80 is subjected to fluorine processing or the like in order to make it difficult for dirt to adhere to the antifouling layer 80 so that fluorine is located on the surface. Specifically, the antifouling layer 80 having good soil detachability, water repellency and oil repellency has a co-weight of a (meth) acrylic acid ester containing a fluoroalkyl group and a hydrophilic group-containing compound. A copolymer, a (meth) acrylic acid ester containing a hydroxyl group, and a copolymer comprising an alkyl (meth) acrylate, if necessary, are provided. In addition, preferably, (meth) acrylic acid ester having a fluoroalkyl group, polyalkylene glycol (meth) acrylate, (meth) acrylic acid ester having a hydroxyl group, which are excellent in soil detachment and water repellency durability And a copolymer containing structural units derived from alkyl (meth) acrylate or butadiene.

Furthermore, acrylic acid ester or methacrylic acid ester having a fluoroalkyl group, polyalkylene glycol acrylate or polyalkylene glycol methacrylate, 3-chloro-2-hydroxypropyl acrylate or 3 improved in terms of soil resistance and water repellency A copolymer having a molecular weight of 1000 to 500,000 containing chloro-2-hydroxypropyl methacrylate and glycerol monoacrylate or building blocks derived from glycerol monomethacrylate is provided. This is, for example, CF ₃ CF ₂ (CF ₂ CF ₂ ) _n CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ (n = 3, 4, 5 compound weight ratio 5: 3: 1 mixture) Compound shown: 20 g, CH ₂ ═C (CH ₃ ) COO (CH ₂ CH ₂ O) ₉ CH ₃ : 10 g, CH ₂ ═C (CH ₃ ) COO (CH ₂ CH (CH ₃ ) O) ₁₂ H: 5 g, CH ₂ ═C (CH ₃ ) COOCH ₂ CH (OH) CH ₂ Cl: 4 g, CH ₂ ═C (CH ₃ ) COOCH ₂ CH (OH) CH ₂ OH: 1 g, isopropanol: 60 g After placing in a flask and sufficiently substituting oxygen in the system with nitrogen, 0.1 g of azobisisobutyronitrile is added and obtained by carrying out a copolymerization reaction with stirring at 70 ° C. for 10 hours (for example, (See Japanese Patent Application Laid-Open No. 6-116340, Example 1).

  Further, the dirt attached to the antifouling layer 80 is easily separated when condensed water comes in the state where the dirt is adhering to the surface of the antifouling layer 80 (amino group, fluoroalkyl). Group) and the hydroxyl group are switched, and the hydroxyl group appears while gathering on the surface layer and combined with the condensed water, the surface layer can be brought into a hydrophilic state, the dirt is peeled off, floated with the condensed water and allowed to flow down. be able to.

  Specifically, as shown in FIG. 8 (a), even if dirt adheres to the surface of the antifouling layer 80, it has the property of selecting and bonding water rather than dirt, When the condensed water adheres to the indoor heat exchanger 10, as shown in FIG. 8 (c), the antifouling layer 80 takes in the condensed water and releases the dirt to wash away the dirt. . As a result, the antifouling layer 80 is less likely to be contaminated, and dirt once adhered is easily removed.

(Temperature characteristics of fin F)
Moreover, the fin F of this embodiment has selected the temperature-dependent thing about the elution amount with respect to the water of the antibacterial and antifungal agent 71. Furthermore, for the fin F of the present embodiment, a drug is selected such that the amount of elution at 20 ° C. or lower is as small as possible and the amount of elution at 40 ° C. or higher is as high as possible.

  FIG. 9 shows a conventional antibacterial / antifungal agent (indicated by a dotted line) and the antibacterial / antifungal agent 71 (indicated by a solid line) of the present embodiment with respect to the elution amount (g / l) of the antibacterial / antifungal agent 71 with respect to water. Showing the difference.

  Conventional antibacterial and antifungal agents have almost no 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 a local increase of about 1.5 to 1.7 times between the elution amount at 20 ° C. and the elution amount at 40 ° C. Yes.

  Moreover, when the elution amount of the conventional antibacterial and antifungal agent at 20 ° C. is compared with the elution amount of the antibacterial and antifungal agent of the present embodiment, the antibacterial and antifungal agent 71 of the present embodiment suppresses the elution amount lower than before. Is done. Furthermore, when the elution amount of the conventional antibacterial and antifungal agent at 40 ° C. and the elution amount of the antibacterial and antifungal agent of the present embodiment are compared, the difference at 20 ° C. is significantly greater in the antibacterial and antifungal agent 71 of the present embodiment. It is shrinking.

  Furthermore, in the above-described resin-based hydrophilic layer 70, when the temperature rises from 20 ° C. to 40 ° C., the size of the hole carrying the antibacterial and antifungal agent 71 expands and becomes large. For this reason, the elution amount at 20 ° C. and the elution amount at 40 ° C. are not only increased due to the increase in the elution amount due to the unique temperature dependence of the antibacterial and antifungal agent 71 but also due to the increase in the elution amount based on the properties of the resin-based hydrophilic layer 70. Each is selected and prepared so that there is a clear difference in the amount of elution.

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

<Antimicrobial treatment control>
The user can start 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 from the controller 30, the control unit 8 starts the antibacterial treatment control by controlling the indoor unit 1 and the outdoor unit 2.

  Here, the flow of antibacterial treatment control (the state on the surface of the fin F and the time change of the state of various components) is shown in FIG. Moreover, the graph which shows the temperature change of the heat exchanger corresponding to a time change, FIG. 11A, the graph which shows the change of the amount of condensed water on the surface of the fin F, FIG. The graph which shows the density | concentration change of the fungicide 71 is shown in FIG.11 (c), respectively.

  Here, a case will be described in which the indoor heat exchanger 10 functions as a refrigerant evaporator in the refrigeration cycle by performing a cooling operation and starts from a state in which condensed water is attached to the surface of the indoor heat exchanger 10. At the start of this antibacterial treatment control, most of the antibacterial and antifungal agent 71 eluted with respect to the condensed water is washed away as condensed water, and as shown in FIG. It has become.

  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 is stopped in an environment where the cooling operation is performed until the antibacterial treatment control is performed, and it is presumed that the user wanted to cool the room, and it is warmed by blowing air. This is because there is no need to send air into the room. Here, as the temperature of the indoor heat exchanger 10 rises to 43 to 45 ° C., the amount of condensed water on the surface of the fin F rapidly decreases as shown in FIG. 11 (b), and FIG. 11 (c). As shown, the elution amount of the antibacterial and antifungal agent 71 increases rapidly, and the elution concentration increases rapidly.

  And the control part 8 performs the control which stops the driving | operation of the indoor fan 13 and the operation of the compressor 22, and maintains a stop 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. For 2 minutes. Here again, as the temperature of the indoor heat exchanger 10 has risen to 43 to 45 ° C., the amount of condensed water on the surface of the fin F rapidly decreases again as shown in FIG. As shown, the elution amount of the antibacterial and antifungal agent 71 rapidly increases, the elution concentration rapidly increases and exceeds the MIC value (minimum growth element concentration). Thereby, bacteria and mold on the surface of the fin F can be killed.

  And the control part 8 stops operation | movement 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.

  Here, the control unit 8 operates the compressor 22 to perform the heating operation so that the temperature of the indoor heat exchanger 10 becomes 51 to 58 ° C., and operates the indoor fan 11 at a low air volume L to M level. To do. As a result, the condensed water on the surface of the fin F evaporates all at once, the elution concentration further increases, and there is almost no bacteria and mold on the surface of the fin F. Here, since the indoor fan 11 is operated and warm air is sent out indoors, the room temperature rises, but the heating air delivery operation is stopped by extending the time of the second air blowing operation or the like. It may be.

<Characteristics of Fin F of Indoor Heat Exchanger 10>
In the fin F of the indoor heat exchanger 10 of the air conditioner 100 of the above-described embodiment, the antifouling layer 80 provided on the outermost surface is subjected to fluorine processing that is difficult to attach floating contaminants floating in the air. Yes. For this reason, the surface of the fin F of the indoor heat exchanger 10 can be made clean. For this reason, since there is no dirt which blocks the elution of the antibacterial / antifungal agent 71, the antibacterial / antifungal agent 71 can be stably eluted.

  Further, the antifouling layer 80 contains an antifouling agent having a lower binding force with floating contaminants flying in the air than with water. For this reason, even if airborne contaminants adhere to the surface layer, when water comes in, for example, when the indoor heat exchanger 10 functions as a refrigerant evaporator, the antifouling agent is more likely to bind to airborne contaminants. However, in order to prioritize the combination with water, airborne contaminants move away from the surface layer. For this reason, since the state in which the surface of the fin F of the indoor heat exchanger 10 is not soiled can be constantly maintained, the antibacterial and antifungal agent 71 can be stably eluted.

  Thereby, it is possible to stably maintain the elution of the antibacterial / antifungal agent 71 by avoiding staying of dirt on the surface and exposing the antibacterial / antifungal agent 71.

  Further, since the amount of contaminants adhering to the surface layer is reduced, the amount of the antibacterial / antifungal agent 71 consumed is small, and a small amount of the antibacterial / antifungal agent 71 maintains a long-term antibacterial / antifungal function. No maintenance is required.

<Modification>
As mentioned above, although embodiment of this invention was described based on drawing, specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention as follows. .

(A)
In the said embodiment, the structure of the fin F in the indoor heat exchanger 10 provided in the indoor unit 1 of the air conditioning apparatus 100 was 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. 4, 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. 12, the antibacterial and antifungal agent 71 is not only a resin-based hydrophilic layer 70 but also a layer of a resin-based lubricant 90 provided on the surface layer. It is good also as the structure contained in. The layer containing the resin-based lubricant 90 can ensure slippage in a state where the two fins F are in contact with each other, and can improve the manufacturability of the heat exchanger.

  If this invention is utilized, it can be applied to an air conditioner.

It is a schematic block diagram of the air conditioning apparatus concerning one Embodiment of this invention. It is a refrigerant circuit figure of an air harmony device. It is a sectional side view of an indoor unit. It is a figure which shows the fin structure of a heat exchanger. (A) It is a figure which shows the structure of the fin surface vicinity of the conventional heat exchanger. (B) It is a figure which shows a mode that the surface of the conventional heat exchanger was contaminated. (C) It is a figure which shows a mode that bacteria propagate on the surface of the conventional heat exchanger. (A) It is a figure which shows the structure of the resin-type hydrophilic layer of the fin of the conventional heat exchanger. (B) 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. It is a figure which shows the particle distribution of the antibacterial antifungal agent of this embodiment. (A) It is a figure which shows the structure of the antifouling process layer of this embodiment. (B) It is a figure which shows the state which the stain | pollution | contamination adhered to the antifouling process layer of this embodiment. (C) It is a figure which shows a mode that the stain | pollution | contamination adhering to the antifouling process layer of this embodiment is washed away. It is a graph which shows the difference in the elution amount of the antibacterial antifungal agent of the fin of a heat exchanger. It is a figure which shows the flow of antimicrobial treatment control. (A) It is a graph which shows the temperature change of a heat exchanger. (B) It is a graph which shows the change of the condensed water amount of the fin surface. (C) It is a graph which shows the density | concentration change of the antibacterial / antifungal agent on the fin surface. It is a figure which shows the fin structure of the heat exchanger which concerns on a modification (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 5 Refrigerant communication piping 8 Control part 10 Indoor heat exchanger 11 Indoor fan (blower fan)
20 outdoor heat exchanger 100 air conditioner

Claims (7)

A heat exchanger (10, 20) of the air conditioner (100),
A fin substrate (50);
An antibacterial and antifungal layer (70) formed on the surface layer side of the fin substrate and including any one of a water-soluble antibacterial agent, an antifungal agent and an antibacterial and antifungal agent (71);
A coating layer (80) comprising an antifouling agent containing a switching agent having a hydrophilic group having hydrophilicity and a non-hydrophilic group having no hydrophilicity formed on the surface side of the antibacterial and antifungal layer;
With
The switching agent of the antifouling agent is such that the non-hydrophilic group is located on the surface side of the hydrophilic layer and the surface of the coating layer has water when there is no water on the surface of the coating layer (80). In a state, the hydrophilic group is located on the surface side rather than the non-hydrophilic group, so that the binding force to the floating pollutant flying in the air is lower than the binding force to water.
Heat exchanger (10, 20) of air conditioner (100). The non-hydrophilic group of the switching agent is a fluoroalkyl group;
The heat exchanger (10, 20) of the air conditioning apparatus according to claim 1. The coating layer (80) is subjected to fluorine processing and is configured such that fluorine is located on the surface.
The heat exchanger (10, 20) of the air conditioning apparatus according to claim 1 or 2.   The switching agent is a copolymer of a (meth) acrylic acid ester containing a fluoroalkyl group and a hydrophilic group-containing compound, a (meth) acrylic acid ester further containing a hydroxyl group with respect to the copolymer, and , A copolymer comprising an alkyl (meth) acrylate, at least one selected from the group consisting of:
The heat exchanger (10, 20) of the air conditioning apparatus according to claim 1 or 2.   The switching agent is derived from (meth) acrylic acid ester having a fluoroalkyl group, polyalkylene glycol (meth) acrylate, (meth) acrylic acid ester having a hydroxyl group, and alkyl (meth) acrylate or butadiene. A copolymer containing units, at least one selected from the group consisting of:
The heat exchanger (10, 20) of the air conditioning apparatus according to claim 1 or 2.   The switching agent is an acrylic ester or methacrylic ester having a fluoroalkyl group, polyalkylene glycol acrylate, polyalkylene glycol methacrylate, 3-chloro-2-hydroxypropyl acrylate, 3-chloro-2-hydroxypropyl methacrylate, and At least one selected from the group consisting of a copolymer having a molecular weight of 1000 to 500,000 containing structural units derived from glycerol monoacrylate or glycerol monomethacrylate,
  The heat exchanger (10, 20) of the air conditioning apparatus according to claim 1 or 2. The antibacterial and antifungal agent contains at least zinc pyrithione,
The heat exchanger (10, 20) of the air conditioning apparatus according to any one of claims 1 to 6.

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