JP6399467B1 - vending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vending machine capable of effectively suppressing dust from adhering to a heat exchanger even when outside air is introduced into a heat exchanger located in a lower part of a main body. I will provide a. A vending machine 10 includes a storage room 12 for storing a product 40, and a machine room 13 positioned below the storage room 12 and partitioned from the storage room 12 by a heat insulating wall. A cooling device 30 for cooling the inside of the storage chamber 12 is provided in the machine chamber 13. The cooling device 30 includes a condenser (heat exchanger) 32 that cools or heats the refrigerant circulating inside by contacting air sucked from outside. An antifouling coating film is formed on at least the surface (air introduction surface) on the upstream side in the air suction direction of the condenser 32. [Selection] Figure 1

Description

  The present invention relates to a vending machine having a configuration in which a cooling device is provided in a machine room located below a storage room.

  The vending machine has, for example, a storage room for storing products and a machine room in which a cooling device for cooling the storage room is provided in order to cool or heat products such as canned beverages and sell them. Yes. The cooling device in the machine room is usually provided with a refrigeration cycle system including a compressor. A general refrigeration cycle system includes a heat exchanger (condenser), a decompression device, an evaporator, and the like in addition to the compressor, and these are connected by piping. The refrigeration cycle system also includes a blower for introducing outside air into the heat exchanger.

  In the basic configuration of the vending machine, the storage room is located at the upper part of the main body of the vending machine, and the machine room is located at the lower part of the main body. Further, the storage room and the machine room are partitioned by a heat insulating wall. Since the machine room is located below the storage room, the refrigeration apparatus in the machine room is naturally located at the lower part of the main body. For the heat exchanger (condenser) provided in the refrigeration system, outside air is introduced from the outside of the main body by a blower (fan) or the like. Generally, the heat exchanger is a front surface of the lowermost main body of the vending machine. Often provided on the side.

  Most vending machines are installed outdoors or indoors where there are many people coming and going. Therefore, when outside air is introduced into the heat exchanger located at the lower part of the main body, dust and the like existing near the floor of the installation place are easily sucked together with the outside air.

  There are various types of such dust. For example, if it is cotton-like dust (cotton dust), the cotton dust is easily clogged between the fins of the heat exchanger. Further, when a lot of dust is clogged between the fins, the ventilation resistance between the fins increases, the efficiency of the heat exchanger decreases, and the refrigeration efficiency of the refrigeration cycle system (cooling device) also decreases. Therefore, in a vending machine, it is necessary to clean the dust clogging between the fins of the heat exchanger during maintenance.

  Therefore, in order to reduce dust clogging between the fins of the heat exchanger and reduce maintenance, as disclosed in Patent Document 1, a plurality of dust adhesion reducing portions are provided on the air inflow side end surface of the fin. A heat exchanger that forms As this dust adhesion reducing portion, for example, there is a configuration having an upward inclined end surface and a downward horizontal end surface located directly below the upward inclined end surface. In this configuration, the entire cross section of the air inflow side end surface is used. It looks like a sawtooth.

  With such a dust adhesion reducing portion, for example, even if the dust in the outside air that is inhaled reaches the upward inclined end surface, it slides down along the inclined surface, so that it is difficult for the dust to accumulate. . Also, even if the dust that has flowed down is sucked again and reaches the downward horizontal end face, the downward horizontal end face is directed vertically downward. To fall downward. As a result, it becomes possible to suppress clogging of cotton dust between the fins over a long period of time.

JP 2001-033183 A

  The heat exchanger disclosed in Patent Document 1 includes a plurality of dust adhesion reducing portions on the air inflow side end surface, thereby reducing adhesion of dust in the air flowing between the fins and reducing dust clogging. .

  However, in this heat exchanger, it is necessary to form the dust adhesion reducing part by processing the air inflow side end face of the fin into, for example, a sawtooth shape. Therefore, when manufacturing the heat exchanger, it is necessary to perform an additional manufacturing process for providing the dust adhesion reducing portion for the fin. Further, in this heat exchanger, when dust clogging (clogging) occurs, there is a problem that cleaning becomes very difficult because the dust adhesion reducing portion is serrated.

  Moreover, when it is going to apply the structure disclosed by patent document 1 to the existing vending machine, since it is necessary to provide a dust adhesion reduction part in a heat exchanger, the shape of heat exchanger itself will differ. Accordingly, it may be necessary to redesign not only the heat exchanger but also the specific configuration of the vending machine (for example, the main body shape of the vending machine, the layout of the machine room, the peripheral structure of the heat exchanger, etc.).

  The present invention has been made to solve such problems, and even when outside air is introduced into the heat exchanger located at the lower part of the main body, dust adheres to the heat exchanger. An object of the present invention is to provide a vending machine capable of effectively suppressing the above with a simple configuration.

  In order to solve the above problems, a vending machine according to the present invention includes a storage room for storing products, and a machine room that is positioned below the storage room and is partitioned from the storage room by a heat insulating wall. And a cooling device for cooling the storage chamber is provided in the machine room, and the cooling device cools or heats the refrigerant circulating inside by contacting air sucked from outside. And an antifouling coating film is formed on at least the upstream surface of the heat exchanger in the air suction direction.

  According to the said structure, the antifouling coating film is formed in the air introduction surface at least with respect to the heat exchanger. Therefore, it is possible to effectively suppress or prevent the dry dirt from adhering to the air introduction surface of the heat exchanger. Moreover, since the antifouling coating film makes it difficult for dirt to adhere, it can be easily removed even if some dirt adheres to the air introduction surface. In addition, since it is only necessary to form an antifouling coating film on the air introduction surface, it is possible to avoid the need for an additional manufacturing process or changing the design of the vending machine itself when manufacturing the heat exchanger. The As a result, it is possible to effectively suppress a decrease in the efficiency of the heat exchanger while suppressing an increase in manufacturing cost with a simple configuration, and it is possible to realize good cooling by the cooling device.

  In the present invention, the above configuration effectively suppresses dust from adhering to the heat exchanger even when outside air is introduced into the heat exchanger located at the lower part of the main body. There is an effect that it is possible to provide a vending machine capable of performing the above.

It is typical sectional drawing which shows an example of schematic structure of the vending machine which concerns on embodiment of this invention. It is a typical perspective view of the vending machine shown in FIG. (A) is the figure of the binarized photograph which shows the grade of adhesion of the dust to the heat exchanger which is the result of the typical Example of this invention, (B) is the result of the comparative example with respect to an Example. It is a figure of the binarized photograph which shows the grade of adhesion of the dust to the heat exchanger which is.

  The vending machine according to the present disclosure has a storage room for storing products, and a machine room that is located below the storage room and is partitioned from the storage room by a heat insulating wall. A cooling device for cooling the inside of the storage chamber is provided, and the cooling device includes a heat exchanger that cools or heats the refrigerant circulating inside by contacting air sucked from outside, and in the heat exchanger The antifouling coating film is formed on at least the upstream surface in the air suction direction.

  According to the said structure, the antifouling coating film is formed in the air introduction surface at least with respect to the heat exchanger. Therefore, it is possible to effectively suppress or prevent the dry dirt from adhering to the air introduction surface of the heat exchanger. Moreover, since the antifouling coating film makes it difficult for dirt to adhere, it can be easily removed even if some dirt adheres to the air introduction surface. In addition, since it is only necessary to form an antifouling coating film on the air introduction surface, it is possible to avoid the need for an additional manufacturing process or changing the design of the vending machine itself when manufacturing the heat exchanger. The As a result, it is possible to effectively suppress a decrease in the efficiency of the heat exchanger while suppressing an increase in manufacturing cost with a simple configuration, and it is possible to realize good cooling by the cooling device.

  In the vending machine having the above configuration, the antifouling coating film is composed of at least nanoparticles, and has an arithmetic mean roughness Ra in the range of 2.5 to 100 nm. Good.

  According to the said structure, the thing of the structure which has the fine surface asperity comprised by the nanoparticle as an antifouling coating film is formed. As a result, it is possible to effectively suppress or prevent at least the dry dirt from adhering to the air introduction surface of the heat exchanger.

  In the vending machine of the said structure, the structure which exists in the range of 5-100 nm of the average particle diameter of the said nanoparticle in the said antifouling coating film may be sufficient.

  According to the said structure, if the average particle diameter of a nanoparticle is in the said range, a fine surface unevenness | corrugation can be implement | achieved more favorably.

  In the vending machine having the above configuration, the nanoparticles are metal nanoparticles, inorganic oxide nanoparticles, inorganic nitride nanoparticles, inorganic chalcogenide nanoparticles, (meth) acrylic resin nanoparticles, fluororesin nanoparticles. The structure which is at least 1 sort (s) selected from the group which consists of particle | grains may be sufficient.

  According to the said structure, if a nanoparticle is a particle | grains which consist of at least any material of the said group, a favorable antifouling coating film can be formed with respect to the heat exchanger of a vending machine.

  Moreover, in the heat exchanger of the said structure, the structure whose film thickness of the said antifouling coating film is 500 nm or less may be sufficient.

  According to the above configuration, it is possible to satisfactorily reduce the chargeability of the antifouling coating film and to satisfactorily suppress or prevent the adhesion of dry dirt.

  Further, in the heat exchanger having the above-described configuration, the antifouling coating film includes, in addition to the nanoparticles, an adhesive component composed of at least a material having affinity with the nanoparticles. Also good.

  According to the above configuration, the strength or durability of the antifouling coating film can be improved, and fine irregularities on the surface can be easily maintained, thereby improving the effect of suppressing or preventing the adhesion of dry dirt. Can do.

  Further, in the heat exchanger having the above-described configuration, the mixture simulated dust mixed with organic simulated dust and inorganic simulated dust is screened and screened, and then the image taken with the optical microscope is binarized. The area ratio of the remaining mixed simulated dust is defined as the dust adhesion area, and the ratio of the dust adhesion area on the coating film to the dust adhesion area on the surface where the coating film is not formed is defined as the dust adhesion area. In other words, the antifouling coating film may have a dust adhesion rate of 15% or less.

  According to the said structure, since the dust adhesion rate of an antifouling coating film is 15% or less, especially adhesion of dry dirt can be suppressed or avoided favorably.

In the heat exchanger having the above configuration, the antifouling coating film may have a surface resistivity of 10 ¹³ Ω / □ or less.

  According to the above configuration, since the chargeability of the antifouling coating film can be reduced satisfactorily, the adhesion of dry dirt can be satisfactorily suppressed or prevented.

  In the vending machine having the above configuration, the heat exchanger may be positioned in front of the machine room.

  According to the above configuration, if the heat exchanger is located on the front surface of the machine room, dry dirt is more easily attached to the air introduction surface, but the antifouling coating film is formed on the air introduction surface of the heat exchanger. Therefore, the adhesion of dry dirt can be effectively suppressed or prevented.

  Hereinafter, typical embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

[Configuration example of vending machine]
An example of a typical configuration of the vending machine according to the present disclosure will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, a vending machine 10 according to the present embodiment has a storage room 12 and a machine room 13 in a main body (vending machine main body) 11 that is a casing. The storage room 12 is located in the upper part of the vending machine main body 11, and the machine room 13 is located in the lower part of the vending machine main body 11 (below the storage room 12). The front surface of the vending machine body 11 is open, and this opening is closed by the outer door 14 and the inner door 15. Therefore, the outer door 14 and the inner door 15 are provided on the front surface of the vending machine body 11 so as to be openable and closable.

  The storage room 12 and the machine room 13 are partitioned by an internal heat insulating wall 16 in the vending machine main body 11. The periphery of the storage chamber 12 is covered with a heat insulating wall. That is, the wall portion of the vending machine main body 11 serving as both side surfaces, the top surface, and the back surface of the storage chamber 12, the internal heat insulating wall 16 serving as the bottom surface of the storage chamber 12, and the inner door 15 serving as the front surface of the storage chamber 12 are Is also constituted by a heat insulating material or a heat insulating structure. Further, as shown in FIG. 2, the inner door 15 is configured to close only the front surface of the storage chamber 12. Therefore, the storage chamber 12 has a semi-hermetic structure by a heat insulating material or a heat insulating structure covering the periphery.

  A storage shelf 20 is provided inside the storage chamber 12. On the upper front surface of the storage shelf 20, a product insertion port 21 for introducing the product 40 is provided. By inserting the product 40 from the product insertion port 21, a plurality of products 40 are stored inside the storage shelf 20, for example, as shown in FIG. 1. As will be described later, since the inside of the storage chamber 12 is cooled by the cooler 33, the product 40 is cooled and stored by being stored in the storage shelf 20. As shown in FIGS. 1 and 2, a plurality of product insertion ports 21 are provided in the vertical direction on the upper front surface of the storage shelf 20, and the storage shelves 20 are arranged in parallel in the front-rear direction of the vending machine body 11. Thereby, multiple types of goods 40 can be stored separately.

  A product chute 22 is provided at the bottom of the storage shelf 20. The merchandise chute 22 has a sloped configuration that inclines downward from the rear side to the front side of the vending machine body 11. The inner door 15 on the front side of the merchandise chute 22 is provided with a merchandise carry-out port 23, and the merchandise carry-out port 23 is closed by a carry-out door 24 that can swing in the front-rear direction.

  A cooling device 30 is provided in the machine room 13 below the storage room 12. The cooling device 30 includes a compressor 31, a condenser (heat exchanger) 32, a decompression device (not shown), a cooler 33, a pipe 34, and the like. The compressor 31, the condenser 32, the pressure reducing device, and the cooler 33 are connected in this order by the pipe 34 to constitute a refrigerant circuit of the refrigeration cycle. Therefore, the cooling device 30 constitutes a refrigeration cycle system.

  Although the concrete structure of the condenser 32 is not specifically limited, A fin and tube type thing can be used in this Embodiment. The fin-and-tube condenser 32 includes a plurality of flat fins and a refrigerant pipe connected to the pipe 34. A plurality of flat fins are stacked, and the refrigerant pipe has a plurality of folded portions so as to penetrate the fins. As another specific configuration of the condenser 32, for example, a perforated tube type can also be suitably used. The perforated tube type condenser 32 has a configuration in which a thin perforated tube having a plurality of flow paths is bent into a folded shape, and fins and the like are provided on the bent perforated tube.

  In the present embodiment, as schematically shown in FIG. 1, an antifouling coating film 37 is formed on at least the front surface (air introduction surface) of the condenser 32. The antifouling coating film 37 is not particularly limited as long as it prevents at least the adhesion of dry dirt. In the present embodiment, as will be described later, for example, a film that is composed of at least nanoparticles and has unevenness in the arithmetic mean roughness Ra of the surface thereof in the range of 2.5 to 100 nm can be exemplified.

  In FIG. 1, the antifouling coating film 37 is schematically illustrated in order to emphasize that the antifouling coating film 37 is formed on the front surface of the condenser 32. However, the actual antifouling coating film 37 is very thin as will be described later, and does not have a thick structure like the antifouling coating film 37 schematically shown in FIG. Therefore, a schematic antifouling coating film 37 is not shown in FIG. 2).

  Moreover, in this Embodiment, although the condenser 32 is illustrated as a heat exchanger with which the vending machine 10 is provided, a heat exchanger is not limited to the condenser 32 and may be an evaporator. Since the condenser 32 cools the warm (relatively hot) refrigerant, the air flow (wind from the outside) that has passed through the condenser 32 becomes warm by taking heat away from the refrigerant (the temperature of the air flow increases). To do). On the other hand, since the evaporator heats the cold (relatively low temperature) refrigerant, the air flow (wind from the outside) that has passed through the evaporator gets cold by applying heat to the refrigerant (the temperature of the air flow rises). To do).

  In the vending machine 10, the compressor 31 and the condenser 32 are provided inside the machine room 13, but the cooler 33 is provided inside the storage room 12 to cool the inside of the storage room 12. Yes. Therefore, most of the cooling device 30 is accommodated in the machine room 13, but the cooler 33 and its accompanying items (such as piping 34 connected to the cooler 33) are accommodated in the storage chamber 12. Yes. A known refrigerant is sealed in the cooling device 30 (refrigerant circuit). The specific type of refrigerant is not particularly limited.

  In addition to the compressor 31 and the condenser 32, a condenser fan 35 shown in FIG. 1, an evaporating dish (not shown), an electrical box 36 shown in FIG. The condenser fan 35 is located on the rear side of the condenser 32 as shown in FIG. Further, in the example shown in FIGS. 1 and 2, the compressor 31 is located on the rear side of the condenser fan 35. An evaporating dish (not shown) is also located behind the condenser fan 35.

  The inner door 15 does not exist in the front opening of the machine room 13 and is closed only by the outer door 14. Therefore, the machine room 13 does not have a semi-sealed structure like the storage room 12, and the inside and outside of the machine room 13 can be ventilated. Further, as shown in FIG. 1, in the machine room 13, the condenser 32, the condenser fan 35, and the compressor 31 are positioned in this order from the front side to the rear side. Therefore, the condenser 32 is located in the forefront of the machine room 13. By operating the condenser fan 35, outside air is introduced into the condenser 32 from the front surface of the vending machine body 11. The electrical box 36 is fixedly disposed at an arbitrary position in the machine room 13, and a control board for controlling the operation of the cooling device 30 and the like is accommodated therein.

  In addition to the storage shelf 20 and the cooler 33 described above, an internal fan 25 and an internal duct 26 are provided inside the storage chamber 12. The internal fan 25 is located, for example, on the front side of the cooler 33 as shown in FIG. Further, an internal duct 26 is provided on the rear side of the cooler 33. The internal duct 26 has an upper end facing the interior of the storage chamber 12, and a lower end facing the rear side of the cooler 33. In the example illustrated in FIG. 1, the internal fan 25, the cooler 33, and the internal duct 26 are provided at positions on the lower rear side in the storage chamber 12, and the product chute 22 is positioned on the front side thereof. .

  Since the storage chamber 12 has a semi-hermetic structure as described above, when the internal fan 25 operates, the internal air (internal storage air) of the storage chamber 12 passes through the internal duct 26 to cool the cooler 33. To be supplied. The supplied internal air is cooled by the cooler 33 and supplied into the storage chamber 12 by the internal fan 25. Thereby, since the cooled internal air circulates inside the storage chamber 12, the product 40 stored in the storage shelf 20 is cooled.

  The outer door 14 closes the entire front opening of the vending machine body 11. As described above, since only the front surface of the storage chamber 12 is closed, when the inner door 15 and the outer door 14 are closed, the inner door 15 and the outer door 14 are placed on the front surface of the storage chamber 12 as shown in FIG. Are positioned so that they overlap each other, and only the outer door 14 is positioned on the front surface of the machine room 13.

  A product outlet 41 is provided at the lower part of the outer door 14, and as shown in FIG. 1, the product outlet 41 is closed by an outlet door 42 so as to be opened and closed. The outlet door 42 may not be provided. As shown in FIG. 1, in the state where the outer door 14 and the inner door 15 are closed, the position of the commodity outlet 41 in the outer door 14 corresponds to the position of the commodity outlet 23 of the inner door 15. A plurality of product samples 43 are provided in the upper part of the outer door 14, and a plurality of product selection buttons 44 are provided so as to correspond to these product samples 43.

  In the present embodiment, a can beverage is schematically illustrated as the product 40, but the product 40 is not limited to this, and may be a plastic bottle beverage or a bottle beverage, or a can product other than a beverage. It may be a paper-packed product or other product. Although not shown, the outer door 14 is provided with a coin insertion slot, a bill insertion slot, an IC card card reader, a coin return slot, a display, and the like.

  A more specific configuration of the vending machine 10 having the above configuration is not particularly limited. For example, as the specific configurations of the vending machine main body 11, the storage chamber 12, the machine chamber 13, the outer door 14, the inner door 15, and the like, various known configurations can be suitably used. Similarly, various known configurations can be suitably used for the specific configurations of the product outlet 41, the product sample 43, the product selection button 44, and the like in the outer door 14. The configuration of the commodity outlet 23 in the inner door 15 is the same. Moreover, a well-known structure can be used suitably also about the cooling device 30. FIG.

  An example of the operation of the vending machine 10 having such a configuration will be specifically described. First, the cooling operation of the product 40 will be described. Inside the storage chamber 12, the internal air is cooled by the cooler 33 by the operation of the cooling device 30. As shown by a thick dotted arrow i1 in FIG. 1, the cooled internal air is blown by the internal fan 25 from the lower rear of the storage chamber 12 toward the front upper side, and the product 40 stored in the storage shelf 20 is sent. Cooling. Thereafter, the internal air that has cooled the product 40 and has reached the upper portion of the storage chamber 12 is introduced into the cooler 33 by the rear internal duct 26 as indicated by a thick dotted arrow i2. By repeating this, the internal air circulates inside the storage chamber 12.

  In the cooler 33, the liquid refrigerant evaporates (vaporizes) to become a gas refrigerant, and the internal air is cooled by the latent heat of evaporation at this time. The gas refrigerant is compressed in the compressor 31 via the pipe 34 and becomes a high-temperature high-pressure gas refrigerant. The high-temperature high-pressure gas refrigerant is condensed in the condenser 32 and liquefied to become a liquid refrigerant.

  As indicated by a thick dotted line arrow e1 in FIG. 1, the high temperature and high pressure gas refrigerant is condensed by heat exchange with the outside air by introducing the outside air into the condenser 32 from the front of the vending machine body 11 by the operation of the condenser fan 35. Is done. The introduced outside air reaches the compressor 31 located behind the machine room 13 as indicated by a thick dotted line arrow e2, and is finally discharged to the outside of the machine room 13 as indicated by a thick line arrow e3. Is done.

  The liquid refrigerant liquefied by the condensation in the condenser 32 is further decompressed by a decompression device (not shown). The decompressed liquid refrigerant evaporates (vaporizes) in the cooler 33 to become a gas refrigerant, and cools the internal air as described above. Thus, the inside of the storage chamber 12 is cooled by the refrigerant being repeatedly vaporized and liquefied and circulated in the refrigeration cycle.

  The operation at the time of selling the product 40 will be described. When the purchaser operates the product selection button 44 while looking at the product sample 43 provided in the outer door 14, the product 40 stored in the storage shelf 20 falls on the product chute 22 at the bottom. In the product chute 22, the dropped product 40 slides down toward the lower front surface of the storage shelf 20 and reaches the product exit 23 provided in the inner door 15. The product 40 swings the carry-out door 24 of the product carry-out port 23 forward, passes through the product carry-out port 23 and reaches the product carry-out port 23 of the outer door 14. After the commodity 40 passes, the carry-out door 24 swings rearward to close the commodity carry-out opening 23. The purchaser opens the take-out door 42 and takes out the product 40 from the product take-out port 41.

  In the operation example described above, the storage chamber 12 is configured to cool the product 40, but the storage chamber 12 is not limited to this, and may be configured to heat the product 40. Therefore, the storage chamber 12 may be configured exclusively for cooling, or may be configured to be switchable to cooling or heating. Therefore, a heating device such as a known heater may be provided inside the storage chamber 12 in addition to the cooler 33, or the cooling device 30 is a heat pump type, and the heat recovered by cooling the product 40. May be used for heating the product 40.

  Here, as described above, the condenser 32 is located on the front surface of the machine room 13 provided in the lower part of the vending machine body 11, and outside air is introduced into the machine room 13 from the front of the vending machine body 11. In many cases, the vending machine 10 is installed in a place where people go in and out even outdoors or indoors. Therefore, there are various causes of dirt near the floor surface on which the vending machine 10 is installed, and it is assumed that various kinds of dirt may adhere to the condenser 32. If dirt is attached to the condenser 32, the heat exchange efficiency by the condenser 32 is lowered, and the cooling efficiency inside the storage chamber 12 by the refrigeration cycle system (cooling device 30) may be lowered.

  As the dirt adhering to the surface of the article, “wet” dirt and “dry” dirt can be considered. Examples of “wet” soils include hydrophilic soils (wet soils) and lipophilic soils (oily soils). These are stains using a “liquid” such as water or oil as a medium (such as a solvent or a dispersion medium).

  On the other hand, “dry” dirt (dry dirt) can be classified into two types, those having a relatively large specific gravity and hard and those having a relatively small specific gravity and soft. For convenience of explanation, the former “dry” dirt is referred to as “large specific gravity rigid type”, and the latter “dry” dirt is referred to as “small specific gravity flexible type”. As the dirt, typically, inorganic dust such as soil, sand dust, carbon and the like is mentioned. As the dirt of “small specific gravity flexible type”, for example, fiber dust such as lint or cotton dust, Alternatively, food powder dust such as wheat flour and starch.

  As shown in FIG. 1, in the vending machine 10, the condenser 32 is accommodated in the machine room 13, and the machine room 13 is closed by the outer door 14. Although the machine room 13 does not have a semi-sealed structure, even if a liquid (medium) such as water or oil is present outside the vending machine body 11, it is difficult to be sucked into the machine room 13. In other words, even if “wet” dirt is present outside the vending machine main body 11, the outer door 14 can almost avoid adhesion to the condenser 32.

  On the other hand, “dry” dirt includes not only “small specific gravity flexible type” dirt such as cotton dust disclosed in Patent Document 1, but also “large specific gravity rigid type” dirt. The “small specific gravity flexible type” dirt is easily sucked into the inside of the machine room 13 by the introduction of the outside air by the condenser fan 35 and adheres to the condenser 32. Further, “large specific gravity rigid type” dirt may also be sucked into the machine room 13 with the introduction of outside air by being wound up by wind. Therefore, it is necessary to focus particularly on the “dry” as the dirt adhering to the condenser 32.

  In the vending machine 10 according to the present disclosure, an antifouling coating film that prevents at least dry dirt from adhering is formed on the air introduction surface of the condenser 32, in other words, the upstream surface in the air suction direction. ing. As a result, it is possible to effectively suppress or prevent dry dirt from adhering to the air introduction surface of the condenser 32. Moreover, since the antifouling coating film makes it difficult for dirt to adhere, it can be easily removed even if some dirt adheres to the air introduction surface. In addition, since it is only necessary to form an antifouling coating film on the air introduction surface, it is not necessary to perform an additional manufacturing process or change the design of the vending machine itself when manufacturing the condenser 32. Is done. Accordingly, the present disclosure can be easily applied to the existing vending machine 10.

[Configuration of antifouling coating film]
Next, the antifouling coating film formed on the condenser (heat exchanger) 32 of the vending machine 10 according to the present disclosure will be described. The antifouling coating film according to the present disclosure may be a film having antifouling properties, more specifically, a film that suppresses or prevents adhesion of dry dirt, and the specific configuration thereof is not particularly limited. . Examples of such an antifouling coating film include a fluorine-based coating, a silicone-based coating, an acrylic coating, and a coating having a fine uneven structure.

  Since the fluorine-based film has a relatively low surface energy, adhesion of dry dirt and the like can be suppressed. Since the silicone-based film or the acrylic film has a relatively high surface smoothness, adhesion of dry dirt and the like can be suppressed. The coating having a fine concavo-convex structure can effectively suppress the adhesion of dry dirt or the like due to the fine concavo-convex surface.

  As a typical example of the antifouling coating film according to the present disclosure, a film having a fine uneven structure can be exemplified. Specifically, for example, there can be mentioned an antifouling coating film composed of at least nanoparticles and having irregularities with a surface arithmetic mean roughness Ra in the range of 2.5 to 100 nm. The nanoparticles constituting the antifouling coating film are not particularly limited, but typically, metal nanoparticles, inorganic oxide nanoparticles, inorganic nitride nanoparticles, inorganic chalcogenide nanoparticles (excluding inorganic oxide nanoparticles) ), (Meth) acrylic resin nanoparticles, fluororesin nanoparticles, and the like.

Specifically, for example, as the metal nanoparticles, Group 11 elements of the periodic table such as gold (Au), silver (Ag), copper (Cu), iron platinum (FePt) or alloys thereof; Examples include metal elements for plating other than Group 11 elements of the periodic table, such as Group 10 elements) and tin (Sn, Group 14 elements). Examples of the inorganic oxide nanoparticles include silica (silicon oxide, SiO ₂ ), yttrium oxide (Y ₂ O ₃ ), barium titanate (BaTiO ₃ ), antimony-doped tin oxide (ATO), and titanium oxide (TiO ₂ ). And indium oxide (In ₂ O ₃ ). Examples of the inorganic nitride nanoparticles include gallium nitride (GaN). Examples of the inorganic chalcogenide nanoparticles include cadmium selenide (CdSe). Examples of (meth) acrylic resin nanoparticles include polymethyl methacrylate (PMMA). Examples of the fluororesin nanoparticles include polytetrafluoroethylene (PTFE).

  These nanoparticles basically constitute an antifouling coating film only by one type, but a plurality of types can be combined to constitute an antifouling coating film. Among these, silica nanoparticles are particularly preferably used because of versatility, cost, ease of adjustment of average particle diameter, and the like. The antifouling coating film is basically composed only of nanoparticles, but may contain components other than nanoparticles as long as the antifouling performance of the antifouling coating film is not hindered. For example, the antifouling coating film may contain an antistatic agent in addition to the nanoparticles.

  The particle size of the nanoparticles is not particularly limited as long as it is at the nano level (less than 1 μm), but in the present disclosure, it is preferably 100 nm or less, and more preferably in the range of 5 to 100 nm. Moreover, as a more preferable range of the average particle diameter, a range of more than 15 nm and less than 100 nm, or a range of 20 nm to 100 nm can be exemplified.

  When the particle size of the nanoparticles is 100 nm or less, it becomes easy to realize a nano level uneven structure on the surface of the antifouling coating film. Also, depending on the specific configuration of the antifouling coating film, if the particle size of the nanoparticles is in the range of 5 to 100 nm, the nano level uneven structure should be easily adjusted to a more suitable range. Can do. Further, when the antifouling coating film contains an adhesive component as described later, the nanoparticle has a particle size of more than 15 nm and less than 100 nm, or within a range of 20 to 100 nm, so that the nano level Can be easily adjusted within a more suitable range.

  Depending on various conditions such as the specific components of the antifouling coating film, the method of forming the antifouling coating film, the surface state of the condenser (heat exchanger) 32 that is the object to be coated, The particle size tends to be better if it is not too small. If the particle size of the nanoparticles is too small, the nanoparticles tend to aggregate and coarsen. Thereby, in the antifouling coating film obtained, the unevenness of the surface becomes larger than within the range of the predetermined arithmetic average roughness Ra. In this case, the dry dirt is easily caught by large irregularities on the surface, and as a result, the dry dirt is likely to adhere.

  The arithmetic average roughness Ra of the surface of the antifouling coating film may be in the range of 2.5 to 100 nm. If the arithmetic average roughness Ra is within this range, the antifouling coating film is formed on the condenser (heat exchanger) 32, which is the object to be coated, so that at least dry dirt is effectively adhered. It becomes possible to suppress or prevent.

  Further, as described above, the antifouling coating film is composed of at least nanoparticles, and the arithmetic average roughness Ra of the surface only needs to be within the above range, and other specific configurations are not particularly limited. For example, the film thickness of the antifouling coating film is not particularly limited, but in general, it may be less than 1 μm (1,000 nm), preferably 500 nm or less, and within the range of 20 to 500 nm. Is more preferable.

  If the film thickness of the antifouling coating film is less than 1 μm, that is, at the nano level, the film thickness becomes relatively small (thin), so that the charging property of the antifouling coating film is reduced well, and dry dirt is adhered. While being able to suppress or prevent well, the transparency of the antifouling coating film can be improved. Although depending on various conditions, if the film thickness is 500 nm or less, the chargeability of the antifouling coating film can be further reduced and transparency can be further improved. Furthermore, although it depends on various conditions, if the film thickness is in the range of 20 to 500 nm, it is possible to realize improvement in transparency and further reduction in chargeability, and further suppress or prevent adhesion of dry dirt. be able to.

  In particular, if the film thickness is 500 nm or less (or in the range of 20 to 500 nm), the condenser (heat exchanger) 32 that is the object to be coated is basically made of metal, so that the antifouling coating film is used. Can be grounded by the electrical conductivity of the condenser 32, so that substantial charging can be avoided. Thereby, the adhesion of dry dirt can be more effectively suppressed or prevented. Moreover, when the film thickness of the antifouling coating film becomes large (thick), the antifouling coating film is likely to generate cracks because the main component is nanoparticles, but if the film thickness is 500 nm or less, cracks are generated. Can be substantially avoided.

The surface characteristics of the antifouling coating film are not particularly limited, but the surface resistivity may be 10 ¹³ Ω / □ or less. As a result, the chargeability of the antifouling coating film can be reduced satisfactorily, so that the adhesion of dry dirt can be suppressed or prevented satisfactorily. Further, the water contact angle of the antifouling coating film may be less than 15 °, and may be 10 ° or less depending on various conditions. Thus, if the water contact angle of the antifouling coating film is small, the hydrophilicity of the surface is improved. Therefore, even if dry dirt accumulates on the surface of the antifouling coating film, the accumulated dry dirt can be easily removed by washing with water.

  In addition, the measuring method of the particle diameter of a nanoparticle is not specifically limited, A well-known method (Diffusion method, an inertia method, a sedimentation method, a microscope method, a light-scattering diffraction method etc.) can be used suitably. In the measurement value of the present embodiment, the particle size measured by a known method may be at the nano level. The method for measuring (evaluating) the arithmetic average roughness Ra of the antifouling coating film is not particularly limited. For example, the arithmetic average roughness Ra is measured (evaluated) using a laser microscope or an atomic force microscope (AFM). Then, it may be calculated based on JIS B0601. Furthermore, the method for measuring the film thickness of the antifouling coating film is not particularly limited, but in this embodiment, as described in the examples described later, the coating cross section is observed with an electron microscope and measured from a plurality of observation images. The average value of the measured film thickness is calculated. Also, the method for measuring (evaluating) the water contact angle of the antifouling coating film is not particularly limited, and for example, measurement (evaluation) is performed using a contact angle meter manufactured by Kyowa Interface Science Co., Ltd., product name: DMo-501. That's fine.

  The specific formation method (manufacturing method) of the antifouling coating film is not particularly limited, and various known methods can be used as long as fine irregularities by nanoparticles can be formed. As a typical forming method, a known coating method in which a coating liquid (coating agent) containing nanoparticles is prepared and applied, a sol-gel method, nanoimprinting, transfer using an anodizing mold, sandblasting, Examples include self-organization of ceramics.

  As described above, the antifouling coating film may be composed of at least nanoparticles, and may further contain an adhesive component composed of at least a material having affinity with the nanoparticles. As a function of the adhesive component, it is only necessary to have a function of adhering nanoparticles to the surface of a condenser (heat exchanger) 32 that is a coating target, in addition to a function of adhering nanoparticles to each other. Therefore, it is sufficient that a material having at least affinity for nanoparticles is a main component.

  When the antifouling coating film contains an adhesive component, the strength or durability of the antifouling coating film composed of nanoparticles can be improved. In addition, since the nanoparticles are well maintained on the surface of the antifouling coating film, fine irregularities on the surface are easily maintained, and the effect of suppressing or preventing the adhesion of dry dirt can be improved.

  The specific composition of the adhesive component is not particularly limited as long as it has affinity for the nanoparticles. For example, if the nanoparticles are silica nanoparticles, a material having an affinity for silica can be used as an adhesive component. Examples of materials having an affinity for silica include silane compounds such as tetramethoxysilane or tetraethoxysilane, acrylic resins, and fluororesins. In addition to these materials, the adhesive component may contain known additives. Therefore, in the heat exchanger according to the present disclosure, the antifouling coating film may be composed of at least nanoparticles, but may be configured to contain an adhesive component in addition to the nanoparticles. The composition may contain a known additive in addition to the adhesive component.

  When the antifouling coating film contains an adhesive component, the content (content ratio) is not particularly limited. For example, when the total weight of the antifouling coating film is 100% by weight, a preferable range is 5 to 5. A range of 60% by weight can be mentioned, and a more preferable range is a range of 10 to 50% by weight. Although depending on various conditions, if the adhesive component exceeds 60% by weight, the amount of the adhesive component relative to the nanoparticles becomes excessive, and the arithmetic average roughness Ra of the surface of the antifouling coating film is within a predetermined range. May come off. On the other hand, if the adhesive component is less than 5% by weight, effects such as improvement in strength or durability commensurate with the content of the adhesive component may not be obtained sufficiently.

  In the present disclosure, an antifouling coating film may be formed when the condenser (heat exchanger) 32 is manufactured (in other words, when the vending machine 10 is manufactured). An antifouling coating film can also be formed on the vessel 32. The method for forming the antifouling coating film on the condenser 32 is not particularly limited. If the condenser 32 is manufactured, a suitable one of known methods such as the above-described methods should be selected and used. Can do. When an antifouling coating film is formed on the condenser 32 of the existing vending machine 10, a coating method can be typically used. That is, a coating liquid (coating agent) containing nanoparticles may be prepared, and the coating liquid may be applied to the condenser 32 of the existing vending machine 10. Thereby, an antifouling coating film can be easily formed.

[Dust adhesion rate of antifouling coating film]
The antifouling coating film having the above structure has a dust adhesion rate of 15% or less. Here, the dust adhesion rate in the present disclosure means that the antifouling coating film is formed with respect to the adhesion amount of the simulated dust on the surface (pre-coating surface) of the condenser (heat exchanger) 32 where the antifouling coating film is not formed. Calculated as the amount of simulated dust adhering to the surface of the condenser 32 (the coating surface constituted by the antifouling coating film).

  As described above, “dry” dirt includes a “large specific gravity rigid type” that has a relatively large specific gravity and is hard, and a “small specific gravity flexible type” that has a relatively small specific gravity and is soft. In the present disclosure, as the simulated dust used for calculating the dust adhesion rate, mixed simulated dust obtained by mixing “large specific gravity rigid type” simulated dust and “small specific gravity flexible type” simulated dust is preferably used. In general, “large specific gravity rigid type” simulated dust is dust composed of an inorganic material, and “small specific gravity flexible type” simulated dust is simulated dust composed of an organic material.

  Specific types of “large specific gravity rigid type” simulated dust and “small specific gravity flexible type” simulated dust are not particularly limited, but test powders defined by various standards such as JIS (Japanese Industrial Standards), etc. Among them, those corresponding to “large specific gravity rigid type” or “small specific gravity flexible type” can be appropriately selected and used. In the present disclosure, as shown in the examples described later, fly ash that is an inorganic material is used as simulated dust of “large specific gravity rigid type”, and organic material is used as simulated dust of “small specific gravity flexible type”. The material is cotton linter. The “large specific gravity rigid type” simulated dust and the “small specific gravity flexible type” simulated dust may be used alone or in combination of two or more.

  As the cotton linter, those sold as a kind of test powder by the Japan Air Cleaning Association (JACA) are used. Corn starch is commercially available. Silica sand is used to evaluate adhesion of “large specific gravity rigid type”, cotton linter is used to evaluate adhesion of fiber dust among “small specific gravity flexible type”, and corn starch is “small specific gravity flexible type”. Is used to evaluate the adhesion of food powder dust. Therefore, as a suitable example of mixed dust of “large specific gravity rigid type” simulated dust and “small specific gravity flexible type” simulated dust, there is mixed simulated dust in which organic simulated dust and inorganic simulated dust are mixed. be able to.

As described above, the dust adhesion rate is determined by mixing on the coating surface constituted by the antifouling coating film with respect to the adhering amount of the mixed simulated dust on the surface before coating of the antifouling coating film in the condenser (heat exchanger) 32. It is defined as the ratio of the amount of adhering simulated dust. In the present disclosure, the adhering amount of the mixed simulated dust on the surface before coating or on the coating surface is calculated as an area ratio of the remaining mixed simulated dust calculated by binarizing an image photographed with an optical microscope. In addition, let this area ratio be a dust adhesion area. When the dust adhesion area on the surface before coating is A ₀ and the dust adhesion area on the coating surface is A ₁ , the dust adhesion rate A _R can be calculated by the following equation (1).

  The dust adhesion rate of the antifouling coating film may be 15% or less, preferably 10% or less, more preferably 5% or less, and particularly preferably 2% or less. If the dust adhesion rate is 15% or less, it is possible to determine that sufficient antifouling performance has been obtained because dust adhesion is not noticeable visually.

  When calculating the dust adhesion rate, for example, an antifouling coating film is formed on a part of the surface of the condenser 32 or a part of the condenser 32, and this is used as an evaluation sample. Can be used. In the sample for evaluation, when the surface on which the antifouling coating film is formed is referred to as a “coating surface”, the mixed simulated dust adheres to the coated surface, but before the mixed simulated dust is adhered, It is preferable to neutralize the sample for evaluation.

  Moreover, the method for adhering the mixed simulated dust to the sample for evaluation and the method for removing the adhering mixed simulated dust are not particularly limited, and various methods can be suitably used. For example, in the examples described later, the mixed simulated dust is screened by depositing a predetermined amount of the mixed simulated dust on the coating surface and then dropping the evaluation sample by tilting it vertically. Moreover, it is not specifically limited about the imaging | photography of the coating | coated surface by an optical microscope, What is necessary is just to image | photograph a several image by the magnification which can observe mixed simulation dust. The binarization processing of the captured image is not particularly limited, and known image processing software or the like may be used.

  Here, in the present disclosure, the antifouling coating film may be formed at least on the air introduction surface (surface on the upstream side in the air suction direction) of the heat exchanger. An antifouling coating film may be formed on a surface other than the introduction surface. For example, an antifouling coating film may be formed on the surface of a tube (such as a refrigerant tube or a porous tube) included in the heat exchanger, or an antifouling coating film may be formed on the side surface of the heat exchanger. Alternatively, an antifouling coating film may be formed on the entire surface of the heat exchanger. Therefore, in the present disclosure, the heat exchanger such as the condenser 32 may have a configuration in which an antifouling coating film is formed on at least the air introduction surface, and the antifouling coating film is also formed on a surface other than the air introduction surface. May be configured.

  The present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to this. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present invention.

(Mixed simulated dust)
Cotton linter sold as a test powder by the Japan Air Cleaners Association (JACA) and fly ash sold as a test powder by JACA were used as simulated dust of “small specific gravity flexible type”. . Cotton linter and fly ash were weighed so as to have a weight ratio of 1: 2 (cotton linter: fly ash = 1: 2) and mixed well to obtain mixed simulated dust.

(Examples and comparative examples)
A coating solution in which silica particles having an average particle diameter of 20 nm were sufficiently dispersed in ethanol as a dispersion medium by adjusting pH or the like was prepared by a known method. This coating liquid is applied to the front half (air introduction surface) of the condenser (heat exchanger) provided in the vending machine using a spray to prevent the film thickness from becoming 500 nm or less. A soil coating film was formed. About half of the front surface of the condenser on which the antifouling coating film was formed was used as an example, and the remaining half of which the antifouling coating film was not formed was used as a comparative example.

  The cooling operation (normal) of the vending machine is started, and about 50 g of the mixed simulated dust is stirred with a mixer at the front side of the condenser (machine room) in the vending machine, whereby the mixed simulated dust is condensed into the condenser. Was aspirated. By continuing the stirring and suction of the mixed simulated dust for about 10 minutes, the operation time expected to correspond to about 5 years was simulated. After completion of the cooling operation, the front surface of the condenser was visually observed. The result (binarized photograph) of the example is shown in FIG. 3 (A), and the result (binarized photograph) of the comparative example is shown in FIG. 3 (B).

  As is apparent from the results of FIGS. 3A and 3B, almost no mixed simulated dust adhered to the front half of the condenser on which the antifouling coating film according to the present disclosure was formed. On the other hand, a large amount of mixed simulated dust adhered to the front half of the condenser where the antifouling coating film was not formed.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  The present invention can be widely and suitably used in the field of vending machines in which a heat exchanger is provided in the lower part.

10: Vending machine 11: Vending machine body 12: Storage room 13: Machine room 14: Outer door 15: Inner door 16: Internal heat insulating wall 20: Storage shelf 21: Product inlet 22: Product chute 23: Product carry-out port 24 : Carrying door 25: Inside fan 26: Inside duct 30: Cooling device (refrigeration cycle system)
31: Compressor 32: Condenser (heat exchanger)
33: cooler 34: piping 35: condenser fan 36: electrical box 37: antifouling coating film 40: product 41: product outlet 42: outlet door 43: product sample 44: product selection button

Claims (8)

A storage room for storing products,
A machine room located below the storage room and partitioned from the storage room by a heat insulating wall;
In the machine room, a cooling device for cooling the storage room is provided,
The cooling device includes a heat exchanger that cools or heats a refrigerant flowing inside by contacting air sucked from outside,
In the heat exchanger, an antifouling coating film is formed at least on the upstream surface in the air suction direction ,
As the dry simulated dust, mixed simulated dust in which organic simulated dust composed of organic material and inorganic simulated dust composed of inorganic material are mixed,
The organic simulated dust has a relatively small specific gravity and is softer than the inorganic simulated dust, and the inorganic simulated dust has a relatively large specific gravity and is harder than the organic simulated dust. Is,
A surface of a part of the surface of the heat exchanger or a part of the part of the heat exchanger, the surface before being coated with the antifouling coating film is a pre-coating surface, and the antifouling coating When the surface coated with the covering film is used as the coating surface, the mixed simulated dust is sprinkled onto the pre-coating surface or the coating surface by dropping the mixed simulated dust vertically and then photographed with an optical microscope. When binarizing the surface before coating or the image of the coating surface, the dust adhesion area on the surface before coating is A _0, and the dust adhesion area on the coating surface is A ₁ , 1)
The dust adhesion rate AR of the antifouling coating film calculated in ( ₁₎ is 15% or less ,
vending machine. The antifouling coating film is composed of at least nanoparticles, and has an arithmetic average roughness Ra having irregularities in the range of 2.5 to 100 nm,
The vending machine according to claim 1. The average particle diameter of the nanoparticles in the antifouling coating film is in the range of 5 to 100 nm,
The vending machine according to claim 2. The group in which the nanoparticles in the antifouling coating film are composed of metal nanoparticles, inorganic oxide nanoparticles, inorganic nitride nanoparticles, inorganic chalcogenide nanoparticles, (meth) acrylic resin nanoparticles, and fluororesin nanoparticles. It is at least one selected from the above,
The vending machine according to claim 2 or 3. In addition to the nanoparticles, the antifouling coating film contains an adhesive component composed of at least a material having affinity with the nanoparticles,
The vending machine according to any one of claims 2 to 4. The film thickness of the antifouling coating film is 500 nm or less,
The vending machine according to any one of claims 1 to 5. The surface resistivity of the antifouling coating film is 10 ¹³ Ω / □ or less,
The vending machine according to any one of claims 1 to 6 . The heat exchanger is located in front of the machine room,
The vending machine according to any one of claims 1 to 7 .