JP2018194181A - Show case - Google Patents

Abstract

To display products under a suitable environment by adjusting a relative humidity of inside air of a case body.SOLUTION: A show case in which an inside air in a storage 11 is adjusted to a predefined target temperature/humidity, includes: a storage 11 defined inside a case body 10; and fan means (36, 39) for sending air cooled by an evaporator 31 provided inside the case body 10 to the storage 11. There are also provided: a weight detecting part 60 for detecting a weight of a product; and a control part in which the weight which is a detection result by the weight detecting part 60 per preset measurement time is input such that, when the present detection result is higher than the previous detection result, an air-sending amount sent by the fan means to the product is reduced, and when the present detection result is lower than the previous detection result, an air-sending amount sent by the fan means to the product is increased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a showcase.

  For example, there is a known showcase that is installed on a counter of a store such as a convenience store and places a product so as to be visible from the outside.

  Such a showcase includes a case body. The case main body has a box shape, the front surface forms a customer service surface, and the rear surface has an opening. A storage chamber is defined inside the case body, and a plurality of product placement shelves are provided in the storage chamber along the vertical direction. The product placement shelf is for placing products to be stored.

  In such a showcase, a cooler is installed inside the case body, and air cooled by the cooler is blown into the storage chamber so as to cool the products placed on each product placement shelf. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2006-96843

  However, in the above-described showcase, although the product placed on each product placement shelf can be cooled, the humidity of the internal air of the storage room is not adjusted, so the product is generated by the air blown. May dry out.

  By the way, when goods (foodstuffs) are put and sealed in an airtight container, it is known that the humidity of the space shows a certain humidity according to the kind of goods. Then, the present invention was created by paying attention to the relative humidity (water activity value × 100) of the space.

  In view of the above circumstances, an object of the present invention is to provide a showcase in which a product can be placed in a favorable environment by adjusting the relative humidity of the internal air of the case body.

  In order to achieve the above object, a showcase according to the present invention includes a storage chamber that is defined inside a case body and displays goods, and is cooled by an evaporator installed inside the case body. A showcase in which the air inside the storage chamber is adjusted to a predetermined target temperature and humidity, and a weight detection means for detecting the weight of the product, When the weight, which is the detection result of the weight detection means, is input at every preset measurement time and the current detection result is greater than the previous detection result, the air blown by the blower means Control means for reducing the amount of air blown to the product while increasing the amount of air blown by the air blowing means to the product when the current detection result is smaller than the previous detection result. Characterized by comprising a.

  In the showcase according to the present invention, the product is placed on a product placement shelf provided in a plurality of stages in the vertical direction in the storage chamber, and the weight detection unit is installed for each product placement shelf. The total weight of the products placed on the corresponding product placement shelf, and the control means inputs the total weight as a detection result of the weight detection means for each measurement time, and If the current detection result is higher than the previous detection result, the amount of air blown by the blowing means is reduced with respect to the corresponding product placement shelf, while the current detection result is the previous detection result. In the case where the air volume is decreased, the amount of air blown by the air blowing means is increased with respect to the corresponding product placement shelf.

  In the showcase according to the present invention, the air blowing unit causes the air cooled by the evaporator to flow through the duct, and then ejects the air to each product mounting shelf through the ejection hole formed in the duct. The control unit is configured to increase or decrease the amount of air blown to the corresponding product placement shelf by adjusting the amount of air passing through the ejection holes.

  In the showcase, the present invention is configured such that electrode pairs are provided on both surfaces of a film made of an ion conductive electrolyte, and the first surface having a relatively high potential is formed on both sides of the film. A humidity control element disposed so as to close the ventilation hole formed in the case body in such a manner that a second surface facing the outside and a relatively low potential faces the inside of the case body, and a voltage is applied to the electrode pair Voltage applying means for applying and air supply means for supplying external air of the case main body to the first surface, and the control means is configured to supply water vapor at the target temperature and humidity when a cooling operation command is given. The cooling operation control is performed by setting the temperature at which the amount becomes the saturated water vapor amount as the evaporation temperature of the refrigerant in the evaporator so that the internal air of the storage chamber is set to the target temperature and humidity, and when the cooling operation control is performed, Storage room When the amount of water vapor in the temperature and humidity of the internal air is less than the amount of water vapor in the target temperature and humidity, humidification control for driving the voltage applying means is performed to make the internal air in the storage chamber have the target temperature and humidity. .

  In the showcase, the present invention is characterized in that the control means drives the air supply means when performing the humidification control.

  According to the present invention, in the state where the internal air of the storage chamber is adjusted to a predetermined target temperature and humidity, the control unit detects the weight of the product for each preset measurement time. Is input and the current detection result is greater than the previous detection result, the amount of air blown by the blower is reduced with respect to the product, so the ambient temperature of the product is reduced. It can be raised, thereby reducing the relative humidity. On the other hand, when the detection result of this time is smaller than the previous detection result, the control means increases the amount of air blown by the air blowing means to the product, so the ambient temperature of the product is set. The relative humidity can be increased by lowering. Therefore, the relative humidity of the internal air of the case main body can be adjusted to place the product in a favorable environment.

FIG. 1 is a cross-sectional side view schematically showing the internal structure of a showcase according to an embodiment of the present invention. FIG. 2 is a schematic diagram schematically showing a characteristic control system of the showcase according to the embodiment of the present invention. FIG. 3 is an explanatory diagram showing an enlarged main part of the showcase shown in FIG. FIG. 4 is a flowchart showing the processing contents of the cooling operation control processing performed by the control unit shown in FIG. FIG. 5 is a chart showing a vapor pressure diagram. FIG. 6 is a chart showing a vapor pressure diagram. FIG. 7 is a flowchart showing the processing contents of the air flow control process performed by the control unit shown in FIG.

  Hereinafter, preferred embodiments of a showcase according to the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 each show a showcase according to an embodiment of the present invention. FIG. 1 is a sectional side view schematically showing an internal structure. FIG. 2 is a characteristic control system. It is a schematic diagram which shows typically.

  The showcase illustrated here is, for example, installed on a counter of a store such as a convenience store to display products, and includes a case body 10, a voltage application means 50, an internal temperature detection unit S1, an internal humidity detection unit S2, A weight detection unit 60 and a control unit 70 are provided.

  The case main body 10 has a box shape, and the interior is partitioned into a storage chamber 11 and a machine chamber 12 in the vertical direction. In the case body 10, the front surface 13 constituting the storage chamber 11 forms a customer service surface together with the left and right side surfaces 14, and an opening (hereinafter also referred to as a rear opening) 15 a is formed on the rear surface 15 constituting the storage chamber 11. ing.

  In the case body 10, the front surface 13 and the left and right side surfaces 14 constituting the storage chamber 11 are formed of a transparent glass material or resin material having a heat insulating structure, and the inside of the storage chamber 11 is visible from the outside. .

  A plurality of (four in the illustrated example) product placement shelves 20 are provided in the storage chamber 11 of the case body 10 in a plurality of stages along the vertical direction. Each product placement shelf 20 has a shelf plate 21. The shelf board 21 has a flat plate shape, and its upper surface constitutes a product placement surface for placing a product.

  The shelf board 21 is supported by a pair of left and right bracket members 22 via rail members (not shown). Here, the bracket member 22 is attached to a shelf column 23 erected in a pair of left and right on the rear side of the storage chamber 11. In FIG. 1, only the left bracket member 22 of the pair of left and right bracket members 22 is illustrated, and only the left shelf column 23 of the pair of left and right shelf columns 23 is illustrated. The rail member is interposed between the shelf board 21 and the bracket member 22, and supports the shelf board 21 so as to be slidable in the front-rear direction with respect to the bracket member 22.

  Thus, the shelf plate 21 can be slid rearward through the rear opening 15a when being pulled out, and is directed forward through the rear opening 15a when being pushed out. It is possible to slide. The products are placed on the top surface of the shelf board 21 so as to be arranged in the front-rear direction and the left-right direction.

  The case body 10 is provided with a cooling unit 30, a circulation fan 36, a door body 37, a humidity control element 40, and an external fan 45.

  The cooling unit 30 is provided in the machine chamber 12 of the case body 10 and is configured in a tubular shape by sequentially connecting an evaporator 31, a compressor 32, a condenser 33, and an electronic expansion valve 34 through a refrigerant pipe. The refrigerant is sealed inside.

  The evaporator 31 is provided in the wind tunnel 17 installed in the machine room 12. Here, the wind tunnel 17 has a heat insulating structure installed in such a manner that it communicates with a suction port 18 a and a blower port 18 b formed in a bottom wall portion 18 that partitions the storage chamber 11 and the machine chamber 12.

  The compressor 32 is installed outside the wind tunnel 17 in the machine room 12. The compressor 32, when driven, sucks and compresses the refrigerant that has passed through the evaporator 31, and discharges it as a high-temperature and high-pressure refrigerant. Similarly to the compressor 32, the condenser 33 is installed outside the wind tunnel 17 in the machine room 12. The condenser 33 condenses the refrigerant by introducing the refrigerant discharged from the compressor 32 and exchanging heat with ambient air. The electronic expansion valve 34 decompresses the refrigerant condensed in the condenser 33 and adiabatically expands it, and sends it to the evaporator 31. The opening degree of the electronic expansion valve 34 is adjusted according to an opening degree command given from the control unit 70.

  In such a cooling unit 30, the refrigerant compressed by the compressor 32 circulates in the order of the condenser 33, the electronic expansion valve 34, and the evaporator 31, whereby the refrigerant passing through the evaporator 31 evaporates and The air around the evaporator 31 is cooled.

  The circulation fan 36 is installed in the vicinity of the evaporator 31 inside the wind tunnel 17. The circulation fan 36 rotates when the circulation fan motor 36 a is driven, and circulates the internal air of the case body 10 between the storage chamber 11 and the wind tunnel 17. More specifically, the circulation fan 36 rotates to suck the air inside the storage chamber 11 into the wind tunnel 17 through the suction port 18a and to pass through the wind tunnel 17, and then to the storage chamber 11 through the blowout port 18b. The internal air of the case body 10 is circulated between the storage chamber 11 and the wind tunnel 17 so as to blow out the air.

  The door body 37 is for opening and closing the rear opening 15a, and is a flat plate member having a size sufficient to close the rear opening 15a. This door body 37 is comprised from the transparent resin material etc. which have heat insulation performance.

  Although not clearly shown in the figure, the door body 37 is supported by a door support member attached to the left edge of the rear opening 15a of the case body 10 and has a center of a door shaft portion extending in the vertical direction. It is provided so as to be swingable around the axis. That is, the door 37 opens the rear opening 15a when swinging backward, and closes the rear opening 15a when swinging forward.

  A rear duct 38 is provided on the front surface of the door body 37. The rear duct 38 forms an air passage 38a extending in the vertical direction between the rear duct 38 and the front surface of the door body 37, and has an introduction port 38b and an ejection hole 38c.

  The introduction port 38b is an opening formed below, and is located above the outlet 18b when the door body 37 closes the rear surface opening 15a. The introduction port 38b is an opening for introducing the air blown from the outlet 18b when the circulation fan 36 rotates.

  A plurality of ejection holes 38 c are formed on the front surface 13 of the rear duct 38. More specifically, a plurality of ejection holes 38c are formed along the left-right direction at a location slightly above the shelf plate 21 of each product placement shelf 20. The ejection hole 38c is a hole portion that ejects air introduced from the introduction port 38b and passing through the air passage 38a forward.

  The rear duct 38 is provided with a plurality (four in the illustrated example) of wind direction members 39. Each of these wind direction members 39 has a wind direction plate 39a. The wind direction plate 39a is a long plate member whose longitudinal direction is the left-right direction. Such a wind direction plate 39a has a length in the left-right direction substantially equal to a length in the left-right direction of the shelf 21 in the product placement shelf 20, and extends in the left-right direction on the rear side of the ejection hole 38c at each height level. It is provided so as to be swingable around the central axis of the wind direction shaft portion 39b that extends. That is, the wind direction member 39 is installed in accordance with the height level of each commodity mounting shelf 20, and the wind direction plate 39a is provided so as to be able to swing up and down around the central axis of the wind direction shaft portion 39b. 39a is held in a posture that is swung by a predetermined angle, so that the amount of air ejected from the ejection hole 38c of the corresponding height level is adjusted to adjust the amount of air blown to the corresponding product mounting shelf 20. The air supply means together with the circulation fan 36 is configured.

  As shown in FIG. 3, the humidity control element 40 includes a plate-like portion 41 and an electrode pair 42. The plate-like portion 41 is configured by sandwiching a membrane (hereinafter also referred to as an SPE membrane) 41a made of a fixed polymer electrolyte between a titanium mesh 41b including a catalyst layer and a carbon paper 41c including a catalyst layer. In this embodiment, the SPE film 41a is shown as an example of a film made of an ion conductive electrolyte. However, in the present invention, not only the SPE film 41a but also a film made of other ion conductive electrolyte is used. Can do.

  Each of the electrode pairs 42 is electrically connected to the plate-like portion 41, and one electrode (hereinafter also referred to as a first electrode) 42 a is electrically connected to the titanium mesh 41 b constituting the plate-like portion 41. Is provided on one surface of the SPE film 41a, and the other electrode (hereinafter also referred to as a second electrode) 42b is electrically connected to the carbon paper 41c constituting the plate-like portion 41 to be connected to the SPE film 41a. Is provided on the other surface.

  In such a humidity control element 40, the titanium mesh 41b and the first electrode 42a constitute an anode, and the carbon paper 41c and the second electrode 42b constitute a cathode. In the humidity control element 40, the anode surface (first surface) 43a that constitutes the anode faces the outside of the case body 10, and the cathode surface (second surface) 43b that constitutes the cathode is the interior (housing) of the case body 10. The vent hole 16a formed in the upper surface 16 of the storage chamber 11 is closed and arranged so as to face the chamber 11).

  The external fan 45 is installed outside the case body 10 by being supported on the upper surface 16 via a support member in a manner facing the anode surface 43 a of the humidity control element 40. The external fan 45 rotates when an external fan motor 45a, which is a drive source, is driven to forcibly supply the external air of the case body 10 to the anode surface 43a, and constitutes the air supply means of the present invention. ing.

  The voltage application unit 50 includes a power supply unit 51 and a voltage adjustment unit 52. The power supply unit 51 applies a DC voltage between the first electrode 42 a and the second electrode 42 b constituting the electrode pair 42. The voltage adjusting unit 52 adjusts the increase / decrease in the applied voltage between the first electrode 42a and the second electrode 42b in accordance with a command given from the control unit 70.

  The internal temperature detection unit S <b> 1 is installed inside the storage chamber 11. The internal temperature detector S1 detects the internal temperature of the storage chamber 11, and sends the detected internal temperature to the controller 70 as a temperature signal.

  The internal humidity detection unit S2 is installed inside the storage chamber 11. The internal humidity detection unit S2 detects the internal humidity of the storage chamber 11, and sends the detected internal humidity to the control unit 70 as a humidity signal.

  The weight detection unit 60 is installed for each product placement shelf 20. These weight detectors 60 detect the total weight (hereinafter simply referred to as “weight”) of the products placed on the corresponding product placement shelf 20, and the detected weight is used as a weight signal to the control unit 70. To be sent.

  The control unit 70 comprehensively controls the operation of the showcase according to programs and data stored in the memory 79, and includes an input processing unit 71, a setting processing unit 72, a cooling operation control unit 73, and a humidification operation control unit. 74 and an air volume control unit 75 are provided.

  The control unit 70 may be realized by causing a processing device such as a CPU (Central Processing Unit) to execute a program, that is, by software, or by hardware such as an IC (Integrated Circuit). It may be realized by using software and hardware together.

  The input processing unit 71 inputs a temperature signal from the internal temperature detection unit S1, a humidity signal from the internal humidity detection unit S2, a weight signal from each weight detection unit 60, and various commands from the input unit 80. . Here, the input unit 80 is used by the manager of the showcase to perform input using a numeric keypad, a keyboard, a touch panel, or the like, and a cooling operation command for performing the cooling operation or the storage room 11 included in the cooling operation command. Information on the target temperature and humidity (target temperature and target humidity) is given to the control unit 70.

  The setting processing unit 72 calculates the water vapor amount from the internal temperature (temperature signal) and internal humidity (humidity signal) input through the input processing unit 71 and the vapor pressure diagram data stored in advance in the memory 79. .

  Further, the setting processing unit 72 determines whether or not the calculated water vapor amount is equal to or higher than the water vapor amount of the target temperature and humidity input through the input processing unit 71, and determines the evaporation temperature of the refrigerant in the evaporator 31 from the target temperature and humidity. It is to set.

  The cooling operation control unit 73 controls the cooling operation by adjusting the driving of the compressor 32 and the circulation fan motor 36a and the opening of the electronic expansion valve 34 according to the conditions set through the setting processing unit 72. .

  The humidifying operation control unit 74 gives an instruction to the voltage adjusting unit 52 according to the determination result of the setting processing unit 72 to adjust the increase / decrease of the applied voltage between the first electrode 42a and the second electrode 42b, The humidifying operation is controlled by driving the motor 45a.

  The air volume control unit 75 compares the weight input through the input processing unit 71 with the previously input weight, and determines the wind direction member 39 having the same height level as the corresponding product placement shelf 20 according to the comparison result. By swinging, the increase / decrease in the amount of air blown to the product placement shelf 20 is controlled.

  FIG. 4 is a flowchart showing the processing contents of the cooling operation control process performed by the control unit 70 shown in FIG. The operation of the showcase will be described while explaining the processing contents of the cooling operation control process.

  When the control unit 70 inputs a cooling operation command from the input unit 80 through the input processing unit 71 (step S101: Yes), the temperature signal (internal temperature) from the internal temperature detection unit S1 and the humidity from the internal humidity detection unit S2 It waits for input of a signal (internal humidity) (step S102).

  When the internal temperature and the internal humidity are input through the input processing unit 71 (step S102: Yes), the control unit 70 calculates the water vapor amount through the setting processing unit 72 (step S103).

  More specifically, when the internal temperature is T3 ° C. and the internal humidity is 50%, by using the vapor pressure diagram data stored in the memory 79, the point A in the vapor pressure diagram shown in FIG. From this vapor pressure diagram, the water vapor amount is calculated as Q3.

  On the other hand, when the internal temperature is T3 ° C. and the internal humidity is 30%, the vapor pressure diagram data stored in the memory 79 is used to obtain the point A ′ in the vapor pressure diagram shown in FIG. The amount of water vapor is calculated as Q3 'from the vapor pressure diagram.

  The control unit 70 that has calculated the amount of water vapor in this manner uses the target temperature and humidity information included in the cooling operation command input through the input processing unit 71 and the vapor pressure diagram data, and the steam at the target temperature and humidity through the setting processing unit 72. The amount is calculated, and it is determined whether or not the water vapor amount calculated in step S103 is equal to or greater than the water vapor amount of the target temperature and humidity (step S104).

  Here, when the target temperature / humidity is T2 (<T3) and the target temperature is 70%, the steam pressure diagram shown in FIGS. 5 and 6 is point B and the water vapor amount is Q2.

  When the water vapor amount is equal to or higher than the water vapor amount of the target temperature and humidity (step S104: Yes), that is, when the water vapor amount Q3 at point A is equal to or higher than the water vapor amount Q2 at point B as shown in FIG. 70 sets the temperature T1 at which the water vapor amount of the target temperature and humidity becomes the saturated water vapor amount to the evaporation temperature through the setting processing unit 72 (step S105).

  The control unit 70 that has set the evaporation temperature in step S105 gives a drive command to the compressor 32 and the circulation fan motor 36a through the cooling operation control unit 73 and gives an opening degree command to the electronic expansion valve 34 (step S106, step S106). Then, the procedure is returned to end the current process.

  According to this, the inside of the storage chamber 11 is cooled and can be shifted in a direction approximating the target temperature and humidity. In addition, since the evaporation temperature of the evaporator 31 is set to T1, it is possible to reduce the amount of moisture lost.

  On the other hand, when the amount of water vapor is less than the amount of water vapor at the target temperature and humidity (step S104: No), that is, when the amount of water vapor Q3 'at point A' is less than the amount of water vapor Q2 at point B, as shown in FIG. The control unit 70 sets the temperature T1 at which the water vapor amount at the target temperature and humidity becomes the saturated water vapor amount to the evaporation temperature through the setting processing unit 72 (step S108).

  The control unit 70 that has set the evaporation temperature in step S108 gives a drive command to the compressor 32 and the circulation fan motor 36a through the cooling operation control unit 73 and gives an opening degree command to the electronic expansion valve 34 (step S109, step S110).

  According to this, it changes in the direction in which the inside of the storage chamber 11 is cooled. However, since the water vapor amount is less than the water evaporation amount of the target temperature and humidity, even if the internal temperature of the storage chamber 11 is set to the target temperature T2, it becomes the target humidity Q2 or less and becomes point C in FIG.

  Therefore, the control unit 70 gives a command to the voltage adjustment unit 52 through the humidification operation control unit 74 to adjust the increase / decrease in the applied voltage between the first electrode 42a and the second electrode 42b (step S111), and an external fan A drive command is given to the motor 45a (step S112), and then the procedure is returned to end the current process.

  According to this, the outside air of the case body 10, that is, the air containing water vapor is supplied to the anode surface 43a and comes into contact therewith. Thereby, the reaction of the following formula (1) occurs on the anode surface 43a, and the reaction of the following formula (2) occurs on the cathode surface 43b, and the hydrogen generated on the cathode surface 43b is oxygen in the internal air of the case body 10. By reacting with the components to form water molecules, the internal air of the case body 10 is humidified. As a result, the interior of the storage chamber 11 can be shifted in a direction approximating the target temperature and humidity.

Formula (1) H ₂ O → 2H ⁺ + 1 / 2O ₂ + 2e ⁻
Formula (2) 2H ⁺ + 2e ⁻ + 1 / 2O ₂ → H ₂ O

  By performing the cooling operation control process in this way, the temperature and humidity of the internal air of the storage chamber 11 are adjusted to the target temperature and humidity. And the control part 70 implements the following ventilation volume control processes to each goods mounting shelf 20 for every predetermined measurement time (for example, 30 minutes-60 minutes).

  FIG. 7 is a flowchart showing the processing contents of the air flow control process performed by the control unit 70 shown in FIG. The operation of the showcase will be described while explaining the processing content of the air flow control process.

  Note that the air flow control process is performed for each product placement shelf 20, and here, one product placement shelf 20 will be described as an example. In addition, it is assumed that one type of product is placed on each product placement shelf 20.

  In this air flow control process, the control unit 70 waits for input of a weight signal from the weight detection unit 60 installed on the corresponding product placement shelf 20 through the input processing unit 71 after the measurement time has elapsed (step S201). . And when the weight signal from the weight detection part 60 is input through the input process part 71 (step S201: Yes), the control part 70 is the said input in the last ventilation volume control process from the memory 79 through the ventilation volume control part 75. The weight information from the weight detector 60 is read (step S202).

  The air volume control unit 75 of the control unit 70 that has read the weight information from the memory 79 compares the current weight input in step S201 with the previous weight read from the memory 79 (steps S203 and S204).

  Here, in step S203 and step S204, one product (product weight: X gram) is taken out from the corresponding product mounting shelf 20 between the previous air flow control process and the current air flow control process. In this case, after subtracting X grams from the previous weight, the current weight is compared with the previous weight.

  If the current weight is greater than the previous weight (step S203: Yes), the air volume control unit 75 of the control unit 70 indicates that the product placed on the corresponding product placement shelf 20 is excessively wet. The air direction plate 39a of the air direction member 39 corresponding to the product placement shelf 20 is swung forward and is ejected from the corresponding ejection hole 38c (cooled by the evaporator 31 and back duct 38 The amount of air blown to the product placement shelf 20 is reduced by reducing the amount of air that has passed through (step S205), and then the procedure is returned to end the current process.

  According to this, the ambient temperature of the product placed on the product placement shelf 20 can be increased and the relative humidity can be lowered due to the reduction of the air flow rate with respect to the product placement shelf 20.

  On the other hand, when the current weight is less than the previous weight (step S203: No, step S204: Yes), the air volume control unit 75 of the control unit 70 is placed on the corresponding product placement shelf 20. It is determined that the product is overdried, and the air direction plate 39a of the wind direction member 39 corresponding to the product placement shelf 20 is swung rearward to eject air (evaporator 31) from the corresponding ejection hole 38c. The amount of air that has been cooled by the air and has passed through the back duct 38 is increased to increase the amount of air blown to the product placement shelf 20 (step S206), and then the procedure is returned to end the current process. To do.

  According to this, the increase in the amount of air blown to the product placement shelf 20 can lower the ambient temperature of the product placed on the product placement shelf 20 and increase the relative humidity.

  If the current weight matches the previous weight (step S203: No, step S204: No), the air volume control unit 75 of the control unit 70 is placed on the corresponding product placement shelf 20. It is determined that the relative humidity of the product is constant, the amount of air blown to the product placement shelf 20 is maintained (step S207), and then the procedure is returned to end the current process.

  By carrying out such an air flow control process, in the storage chamber 11 in which the internal air is adjusted to the target temperature and humidity, the air flow with respect to each product mounting shelf 20 is increased or decreased, whereby each product placement. The ambient temperature of the product on the shelf 20 (the temperature in the upper region of each product placement shelf 20) is lowered or raised, and thereby the relative humidity of the ambient air of the product on each product placement shelf 20 can be raised or lowered for adjustment. .

  As described above, according to the showcase according to the embodiment of the present invention, in the state where the internal air of the storage chamber 11 is adjusted to the target temperature and humidity, the controller 70 detects the weight detector 60 every measurement time. When the weight that is the detection result is input and the current detection result is greater than the previous detection result, the amount of air blown by the wind direction member 39 to the corresponding product placement shelf 20 is reduced. On the other hand, when the current detection result is smaller than the previous detection result, the amount of air blown by the wind direction member 39 is increased to the corresponding product placement shelf 20, so that each product placement The relative humidity of the ambient air around the product on the shelf 20 can be adjusted, so that the product can be placed in a favorable environment.

  According to the showcase described above, the external fan 45 rotates to supply external air to the anode surface 43a of the humidity control element 40. Therefore, the contact opportunity per unit time between the anode surface 43a and moisture contained in the external air. As a result, the amount of treated water increases, and the time required for adjusting the humidity of the internal air of the case body 10 can be shortened.

  Further, according to the showcase described above, when the control unit 70 is given a cooling operation command, the internal air is set to the temperature at which the water vapor amount at the target temperature and humidity becomes the saturated water vapor amount as the refrigerant evaporation temperature in the evaporator 31. Since the cooling operation control is performed, the loss of water loss can be reduced. Moreover, when the control unit 70 performs the cooling operation control when the amount of water vapor in the temperature and humidity of the internal air of the storage chamber 11 is less than the amount of water vapor in the target temperature and humidity, the controller 70 drives the voltage adjustment unit 52 and externally. Since the fan 45 is driven, the internal air of the case body 10 is humidified, and as a result, it can be brought close to the target temperature and humidity.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the above-described embodiment, the weight detection unit 60 is installed for each product placement shelf 20 and detects the total weight of the product placed on the corresponding product placement shelf 20. In the case, the weight detection means is not particularly limited as long as it detects the weight of the product.

  In the above-described embodiment, the air direction plate 39a constituting the air direction member 39 is swung to adjust the amount of air to be ejected to each product placement shelf 20 through the ejection holes 38c formed in the rear duct 38. The airflow direction member 39 increases or decreases the amount of air blown to the corresponding product mounting shelf 20. You may increase / decrease the ventilation volume with respect to a shelf.

DESCRIPTION OF SYMBOLS 10 Case main body 11 Storage room 12 Machine room 20 Commodity mounting shelf 21 Shelf board 30 Cooling unit 31 Evaporator 32 Compressor 33 Condenser 34 Electronic expansion valve 36 Circulation fan 36a Circulation fan motor 37 Door body 38 Back surface duct 38a Air passage 38b Inlet port 38c Ejection hole 39 Airflow direction member 39a Airflow direction plate 39b Airflow direction shaft portion 40 Humidity adjustment element 41 Plate-like portion 42 Electrode pair 45 External fan 45a External fan motor 50 Voltage application means 51 Power supply portion 52 Voltage adjustment portion 60 Weight detection portion 70 Control Unit 71 Input processing unit 72 Setting processing unit 73 Cooling operation control unit 74 Humidification operation control unit 75 Air flow control unit 79 Memory S1 Internal temperature detection unit S2 Internal humidity detection unit

Claims (5)

A storage room that is defined inside the case body and displays products;
A showcase in which air cooled by an evaporator installed inside the case body is blown to the storage chamber, and the internal air of the storage chamber is adjusted to a predetermined target temperature and humidity Because
Weight detection means for detecting the weight of the product;
When the weight, which is the detection result of the weight detection means, is input at every preset measurement time and the current detection result is greater than the previous detection result, the air blown by the blower means A control means for reducing the amount of air blown to the product while the current detection result is smaller than the previous detection result, and a control means for increasing the amount of air blown by the air blowing means to the product. A showcase characterized by the provision. The product is placed on a product placement shelf provided in a plurality of stages in the vertical direction in the storage room,
The weight detection means is installed for each product placement shelf and detects the total weight of the product placed on the corresponding product placement shelf,
The control means inputs the total weight, which is the detection result of the weight detection means, at every measurement time, and when the current detection result is greater than the previous detection result, the control means is blown by the blower means. If the current detection result is smaller than the previous detection result, the product placement corresponding to the air blown by the blowing means is reduced. The showcase according to claim 1, wherein the amount of air blown to the shelf is increased. The air blowing means blows air that has been cooled by the evaporator to the storage chamber by causing the air to flow through the duct and then ejecting the air to each product mounting shelf through the ejection holes formed in the duct.
The showcase according to claim 2, wherein the control means adjusts the amount of air passing through the ejection holes to increase or decrease the amount of air blown to the corresponding product placement shelf. An electrode pair is provided on both surfaces of a film made of an ion conductive electrolyte, and the first surface having a relatively high potential out of both surfaces of the film faces the outside of the case body and has a relatively low potential. A humidity control element disposed by closing a vent hole formed in the case body in such a manner that the second surface faces the inside of the case body;
Voltage applying means for applying a voltage to the electrode pair;
Air supply means for supplying outside air of the case body to the first surface;
When the cooling operation command is given, the control means performs the cooling operation control using the temperature at which the water vapor amount at the target temperature and humidity becomes the saturated water vapor amount as the refrigerant evaporation temperature in the evaporator, and performs the cooling operation control. When the amount of water vapor in the temperature and humidity of the internal air in the storage chamber at the time of performing the cooling operation control is less than the amount of water vapor in the target temperature and humidity. The showcase according to claim 1, wherein humidification control is performed to drive the interior air so that the internal air of the storage chamber has a target temperature and humidity.   The showcase according to claim 4, wherein the control means drives the air supply means when performing the humidification control.

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