JP4820219B2 - Showcase - Google Patents

Description

  The present invention relates to a showcase that includes a cooling device that cools a product storage unit and a product shelf heater attached to a product shelf in the product storage unit, and the product storage unit can be set in a plurality of temperature zones.

Conventionally, as this type of showcase, the one shown in Patent Document 1 is known. This showcase is a partition that forms a cold air duct between a showcase body that is provided with side plates on both sides of a heat insulating wall having a substantially U-shaped cross section with an open front surface, and a heat insulating wall that is disposed inside the heat insulating wall. A plate, a machine room provided below the heat insulating wall, and a plurality of detachable product shelves installed on the partition plate. An auxiliary cold air duct communicating with the cold air duct is detachably attached to one of the plurality of product shelves. A damper is detachably provided in the cold air duct so as to introduce cold air into the auxiliary cold air duct. Furthermore, the heater which heats goods is provided in the upper surface of the goods shelf with which the auxiliary | assistant cold air duct was attached. With such a structure, the upper space of the product shelf is used as a heating region, and the lower space of the product shelf is used as a cooling region. Moreover, it is possible to make the whole into a cooling region by exchanging the product shelf for a normal product shelf and removing the damper.
JP-A-6-14827

  By the way, although the showcase described in Patent Document 1 has only one product shelf arranged in the heating region, there has been a demand for installing a plurality of product shelves in the heating region. In this case, it is necessary to install a heater in each of the product shelves in the heating region in order to bring the product into an appropriate heating state.

  However, when the number of heaters for heating increases as described above, there is a problem that power consumption in the entire showcase becomes too large. Specifically, when the showcase is used with a single-phase 100V commercial power supply, it is necessary not to exceed the electrical rating of the outlet 15A-125V. However, as described above, if the number of heaters is increased, the electrical rating may be exceeded, so it is difficult to form a large heating region.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a showcase in which a heating region and a cooling region can be freely set without increasing the maximum power consumption.

In order to achieve the above-described object, in the present application, a showcase body in which a product storage unit is formed inside, a cooling device that supplies cold air to the product storage unit, and one or more product shelves arranged in the product storage unit, a commodity shelf heater attached to shelves, in showcase and a control device for controlling the cooling device and the power supply to the shelf heater, the control device, the temperature inside temperature of the cooling target is given Cooling control that intermittently supplies power to the cooling device so as to be within the range, and power supply that supplies power to the product shelf heater so that the temperature of the product shelf to be heated falls within a predetermined temperature range. In the heating control, the power consumption of the product shelf heater while the power supply to the cooling device in the cooling control is turned on by intermittent control is the cooling in the cooling control. Power supply to the location is proposed which is characterized in that for controlling the supply of power to the shelf heaters to be reduced than power consumption of the shelves heater in while turned off by the intermittent control.

  Generally, in a showcase control device, energization of the cooling device is intermittently performed in order to maintain a predetermined cooling temperature zone. The control device according to the present invention controls the power supply to the product shelf heater so that the power consumption of the product shelf heater is reduced during energization of the cooling device. Accordingly, even when the cooling device and the heater are driven simultaneously, the power consumption of the entire showcase can be suppressed, so that the size of the heating region and the cooling region can be set freely.

  As an example of a specific aspect of the present invention, in the present application, a plurality of product shelf heaters are attached to the product shelf, and the control device is configured to apply all products while energization to the cooling device is stopped. Proposed is one that controls the operation of the shelf heaters and stops the operation control of some of the product shelf heaters while the cooling device is energized. As a more specific example, in the present application, the plurality of product shelf heaters includes a first product shelf heater and a second product shelf heater, and the first product shelf heater is disposed at a peripheral portion of the product shelf, The second product shelf heater is disposed inside the first product shelf heater, and the control device controls the operation of the first and second product shelf heaters while energization to the cooling device is stopped. The present invention proposes that the operation control of the second commodity shelf heater is stopped during energization of the cooling device.

  According to the present invention, a plurality of product shelf heaters are installed for one product shelf, and the operation control of some product shelf heaters is stopped while the cooling device is energized. An increase in power can be suppressed. Here, the operation control of the heater means that energization of the heater is controlled so that the heater is maintained within a predetermined temperature range.

  Further, in the present application, in addition to the above-described configuration, an evaporating dish that receives drain water and an evaporating dish heater attached to the evaporating dish are provided. We propose a device that controls the power supply to the evaporating dish heater to reduce power consumption. According to the present invention, an increase in maximum power consumption can be further suppressed.

  It is preferable that the control device switches whether to control power consumption of the product shelf heater according to the number of product shelves that control the operation of the product shelf heater. Depending on the number of product shelves, this may not exceed the rating without performing power consumption control as described above, but in this case, it is preferable not to perform power consumption control from the viewpoint of heating efficiency. It is.

  As described above, according to the present invention, the power supply to the product shelf heater is controlled so that the power consumption of the product shelf heater is reduced while the cooling device is energized, so the cooling device and the heater are driven simultaneously. Even in this case, the power consumption of the entire showcase can be suppressed. Thereby, the magnitude | size of a heating area | region and a cooling area | region can be set freely.

(First embodiment)
A showcase according to a first embodiment of the present invention will be described with reference to the drawings. 1 is an overall perspective view of the showcase, FIG. 2 is a side sectional view of the showcase, and FIG. 3 is a plan view of a product shelf.

  This showcase includes a showcase body 10 having an opening on the front surface, a product shelf 20 provided in a plurality of upper and lower stages (four stages in the present embodiment) in the showcase body 10, The ventilation path 30 formed along the bottom surface side, the back surface side, and the top surface side, and the cold air circulation duct 40 extending forward from a predetermined position in the vertical direction on the back surface side of the ventilation path 30 are provided.

  The showcase main body 10 is formed with heat insulating walls 11 on the upper surface side, the back surface side, and the bottom surface side. Further, the left and right side surfaces of the showcase body 10 are formed by the heat insulating wall 12 on the upper surface side, the back surface side, and the bottom surface side, and the space between the upper surface side and the bottom surface side of the heat insulating wall 12 is covered by the glass plate 13. Yes. In the showcase body 10, a top plate 14, a back plate 15, and a bottom plate 16 are provided on the upper surface side, the back surface side, and the bottom surface side, respectively, spaced from the inner surface of the heat insulating wall 11, and a product storage portion 17 is provided therein. Is formed. An in-chamber temperature sensor 18 made up of a thermistor or the like for detecting the temperature of the product storage unit 17 is attached to the lower portion of the back plate 15. A machine room 50 is provided below the heat insulating wall 11 of the showcase body 10.

  Each product shelf 20 includes a shelf plate 21 on which products can be placed and a pair of shelf supports 22 that support the shelf plate 21, and the rear end side of the shelf receiver 22 is supported at an arbitrary position in the vertical direction of the product storage unit 17. It has come to be. The shelf board 21 is rotatably connected to the front end side of the shelf support 22 and can be inclined forward and downward in addition to leveling the upper surface of the shelf board 21. Further, a pair of width-wise upper rail portions to which the cold air circulation duct 40 can be attached are provided in parallel to the shelf plate 21 on the lower surface side of the shelf plate 21, and the inclination angle of the upper rail portion is the same as the inclination angle of the shelf plate 21. It comes to become. The product shelf 20 located at the lowermost stage is arranged in front of the other product shelves 20 and can store a cold air circulation duct 40 that is not used.

  The shelf board 21 of each product shelf 20 is provided with a product shelf heater 23 composed of an electric heater for heating the placed product. Here, the shelf shelf 23 attached to the first shelf (referred to as “first shelf”, hereinafter the same) 21 and the second shelf 21 is shown in FIG. Thus, it is comprised by the main heater 23a and the auxiliary heater 23b. The main heater 23 a is meanderingly arranged at the peripheral edge of the shelf plate 21. The auxiliary heater 23b is meanderingly arranged inside the main heater 23a. The product shelf heaters 23 attached to the third shelf plate 21 and the fourth shelf plate 21 are arranged meandering at the peripheral edge of the shelf plate 21. Further, a shelf temperature sensor 24 composed of a thermistor or the like for detecting the temperature of the shelf board 21 is attached near the center of the shelf board 21.

  The ventilation path 30 is formed between the inner surface of the heat insulating wall 11 and the top plate 14, the back plate 15, and the bottom plate 16. An air suction port 31 is provided at the lower end of the opening of the showcase body 10, and at the upper end. An air discharge port 32 is provided. In the vicinity of the air discharge port 32, a first dew condensation heater 32a for preventing dew condensation is attached. In addition, a second dew-proof heater 31 a for preventing condensation is also provided near the air inlet 31. The ventilation passage 30 on the back side is formed so as to have the same size in the front-rear direction over the vertical direction by the duct abutting plate 33 provided on the heat insulating wall 11 side extending in the vertical direction in parallel with the back plate 15. The rear end side of the cold air circulation duct 40 attached to the product shelf 20 other than the lowermost stage can come into contact. In addition, a plurality of duct insertion holes 34 extending in the width direction in which the rear end side of the cold air circulation duct 40 can be inserted are provided in the back plate 15 at intervals in the vertical direction, and each duct insertion hole 34 has an opening / closing plate 35. It can be opened and closed freely. A plurality of air discharge ports for discharging cool air into the product storage portion 17 are provided in the width direction at the center in the vertical direction of the opening / closing plate 35. Further, a blower 36 for circulating air is provided in the ventilation path 30 on the bottom side, and a cooler 37 for cooling the air is provided in the lower part of the ventilation path 30 on the back side. In addition, a duct abutting plate 38 is provided on the front side of the cooler 37 so that the rear end side of the cool air circulation duct 40 attached to the product shelf 20 positioned at the lowest level abuts.

  The cold air circulation duct 40 has a duct portion that circulates air forward, and a partition portion that restricts the air flow to the upper ventilation passage 30 by partitioning the ventilation passage 30 in the vertical direction. Is formed. The duct portion is formed in a quadrangular cross section extending in the width direction, and cool air is discharged downward from the front end side. The partition portion has a lower surface and a front surface that are open, and allows air that circulates in the ventilation path 30 from below to above to flow through the duct portion. Further, an airtight member is provided on the rear end side of the partition portion in the width direction, and the airtight member is brought into contact with the duct contact plate 33 so as to prevent air leakage to the upper ventilation path 30. It has become. Furthermore, a plate-like lower rail portion extending in the front-rear direction is provided on both ends in the width direction on the upper surface side of the duct portion so as to project outward, and each lower rail portion slides on the upper rail portion of each product shelf 20. The cold air circulation duct 40 can be detachably attached to each product shelf 20 by being movably engaged.

  The machine room 50 is provided with a compressor 51 and a condenser 52 that constitute a cooling device together with the cooler 37, a blower 53 that mainly cools the condenser 52, and an evaporating dish 54 that receives drain water. A drain hole 11a is formed at the bottom of the heat insulating wall 11, and drain water is received in the evaporating dish 54 through the drain hole 11a. Further, the evaporating dish 54 is provided with an evaporating dish heater 54a for promoting the evaporation of drain water.

  In the showcase configured as described above, when the cool air distribution duct 40 is not used, for example, when all the products in the product storage unit 17 are cooled or heated, the cool air distribution duct 40 is provided in the product shelf 20 positioned at the lowest level. Install. When all the products stored in the product storage unit 17 are cooled, the air sucked into the ventilation path 30 from the air suction port 31 at the lower end of the opening by the blower 36 is cooled by the cooler 37 and the upper end of the opening is formed. The product storage unit 17 is cooled by discharging cool air from the air discharge ports 32 and the air discharge ports provided in the respective opening / closing plates 35.

  On the other hand, in the case where the product storage unit 17 is set to the two temperature zones, the cold air circulation duct 40 of the product shelf 20 serving as a boundary is attached. Thus, since the ventilation path 30 is partitioned in the vertical direction by the partition portion of the cold air circulation duct, the air flowing through the ventilation path 30 flows through the cold air circulation duct 40 and is provided at the front end side of the duct portion. While being discharged from the hole, the cool air is discharged from the air discharge port provided in the opening / closing plate 35 located below the cool air circulation duct 40, whereby the lower part of the product storage unit 17 is cooled. In addition, the product shelf 20 positioned above the cold air circulation duct 40 is heated by the product shelf heater 23 on the upper surface of the shelf plate 21.

  Next, a showcase control apparatus according to the present embodiment will be described with reference to FIG. FIG. 4 is a schematic block diagram of the control device. As shown in FIG. 4, the control device 60 operates the main control unit 61 composed of a one-chip microcomputer, the compressor 51, each commodity shelf heater 23, the dew proof heaters 31a and 32a, and the evaporating dish heater 54a. Relay circuit 62 and an operation mode changeover switch 63 for switching the operation mode of the showcase. The relay circuit 62 is supplied with 100V commercial AC power, and the compressor 51 and the heaters 23, 31a, 32a, and 54a are driven by the power supply. The main control unit 61 is connected to the internal temperature sensor 18 and the shelf temperature sensors 24 provided in the product storage unit 17. The main control unit 61 sends the compressor 51 and the heaters 23, 31a, 32a, 54a to the compressor 51 and the heaters 23, 31a, 32a, 54a based on the temperature detected by the internal temperature sensor 18 and each shelf temperature sensor 24 and the operation mode selected by the operation mode switch 63. Control energization.

  In the present embodiment, there are four operation modes. Specifically, (a) a first operation mode in which the entire product storage unit 17 is cooled, (b) a second operation mode in which the temperature zone is divided by the first product shelf 20 located in the first stage, ( c) A third operation mode in which the temperature zone is divided by the second product shelf 20 located in the second stage, and (d) a fourth operation mode in which the entire product storage unit 17 is heated. Hereinafter, the operation of the control device 60 in each operation mode will be described.

  The operation in the first operation mode for cooling the entire product storage unit 17 will be described with reference to the timing chart of FIG. In the case of the first operation mode, the control device 60 energizes the compressor 51 intermittently so that the temperature detected by the internal temperature sensor 18 falls within a predetermined temperature range. The evaporating dish heater 54a and the dew proof heaters 31a and 32a are always energized and controlled so as to be within a predetermined temperature range. The product shelf heaters 23 of all the product shelves 20 are always turned off.

  The operation in the second operation mode in which the temperature zone is divided by the first product shelf 20 located in the first stage will be described with reference to the timing chart of FIG. In the case of the second operation mode, the control device 60 energizes the compressor 51 intermittently so that the temperature detected by the internal temperature sensor 18 falls within a predetermined temperature range. The evaporating dish heater 54a is always energized and controlled so as to be within a predetermined temperature range. The first dew-proof heater 32a provided at the air discharge port 32 is always turned off. The second dew-proof heater 31a provided at the air inlet 31 is always energized and controlled so as to be within a predetermined temperature range. The product shelf heater 23 (both the main heater 23a and the auxiliary heater 23b) of the first product shelf 20 located in the first stage is always energized and controlled so as to be within a predetermined temperature range. The product shelf heaters 23 of the other product shelves 20 located from the second stage to the fourth stage are always turned off.

  The operation in the third operation mode in which the temperature zone is divided by the second commodity shelf 20 located in the second stage will be described with reference to the timing chart of FIG. In the case of the third operation mode, the control device 60 energizes the compressor 51 intermittently so that the temperature detected by the internal temperature sensor 18 falls within a predetermined temperature range. The evaporating dish heater 54a performs energization control so as to be within a predetermined temperature range only while the compressor 51 is deenergized. The first dew-proof heater 32a provided at the air discharge port 32 is always turned off. The second dew-proof heater 31a provided at the air inlet 31 is always energized and controlled so as to be within a predetermined temperature range. As for the product shelf heaters 23 of the first and second product shelves 20 located in the first and second stages, the main heater 23a is always energized and controlled so as to be within a predetermined temperature range. The auxiliary heater 23b performs energization control so as to be within a predetermined temperature range only while the compressor 51 is deenergized. The product shelf heaters 23 of the other product shelves 20 located in the third and fourth stages are always turned off.

  The operation in the fourth operation mode for heating the entire product storage unit 17 will be described with reference to the timing chart of FIG. In the fourth operation mode, the control device 60 always stops energization of the compressor 51, the evaporating dish heater 54a, and the dew proof heaters 31a and 32a. The product shelf heater 23 (both the main heater 23a and the auxiliary heater 23b) of the first product shelf 20 located in the first stage is always energized and controlled so as to be within a predetermined temperature range. The merchandise shelf heater 23 of the second merchandise shelf 20 located in the second stage always controls energization so that only the main heater 23a is within a predetermined temperature range. The product shelf heaters 23 of the other product shelves 20 located in the third and fourth stages are always energized and controlled so that they are always within a predetermined temperature range.

  In such a showcase, in the third operation mode, the evaporating dish heater 54a and the auxiliary heaters 23b of the first and second product shelves 20 are only activated while the power to the compressor 51 is stopped. Since energization control is performed, the maximum power consumption can be reduced. In addition, even during the power consumption reduction control, the energization control of the main heater 23a of the first and second product shelves 20 is maintained, so the products placed on the first and second product shelves 20 The heating state can be maintained.

(Second Embodiment)
A showcase according to a second embodiment of the present invention will be described with reference to the drawings. The difference between the showcase according to the present embodiment and the first embodiment is the circuit configuration of the control device. Since other configurations are the same as those of the first embodiment, only the differences will be described here.

  FIG. 9 shows a circuit diagram of the showcase according to this embodiment. In FIG. 9, only those related to the gist of the present invention are shown. In FIG. 9, the same components as those in the first embodiment are denoted by the same reference numerals. In FIG. 9, circled symbols X1, X2,..., X6 indicate relay coils, and switches with the same symbols are relay switches corresponding to the relay coils. In FIG. 9, the normally closed setting of the relay switch contacts is indicated by a black circle.

  In the present embodiment, the product shelf heaters 23 of the uppermost and second product shelves 20 are energized and controlled by the first thermostat 71, and the product shelf heaters 23 of the third and lowermost product shelves 20 are The energization is controlled by the second thermostat 72, and the compressor 51 is energized by the third thermostat 73. Each thermostat 71-73 is an electronic thermostat which performs energization control based on the temperature detected by the connected temperature sensor, and operates by supplying AC power. A shelf temperature sensor 24 attached to the uppermost product shelf 20 is connected to the first thermostat 71. A shelf temperature sensor 24 attached to the third-stage product shelf 20 is connected to the second thermostat 72. The internal temperature sensor 18 is connected to the third thermostat 73.

  As shown in FIG. 9, one end of a commercial power source is connected to the movable contact side of the operation mode changeover switch 63 composed of a rotary switch. Of the fixed contacts of the operation mode switch 63, the contact 63a corresponding to the first operation mode (indicated as “4C” in FIG. 9) is connected to a commercial power supply via the first dew-proof heater 32a. ing. Moreover, the relay coil X4 is connected to the normally closed setting side of the relay switch X3 in the commercial power source. Of the fixed contacts of the operation mode changeover switch 63, the contact 63b corresponding to the second operation mode (indicated as “1H3C” in FIG. 9) is connected to the power supply terminal of the first thermostat 71. The power terminal of the first thermostat 71 is connected to the normally open contact of the relay switch X3.

  The first thermostat 71 has two temperature control terminals, one terminal of one circuit is connected to a commercial power source, the other terminal is a temperature fuse 81, and the main heater of the first-stage shelf 20 It is connected to a commercial power supply via 23a. The auxiliary heater 23b provided in parallel with the main heater 23a is connected in parallel. A parallel connection circuit of relay switches X3 and X5 connected in series and relay switch X4 is connected in series to the auxiliary heater 23b. One terminal of the other circuit of the first thermostat 71 is connected to a contact 63c corresponding to the third operation mode (denoted as “2H2C” in FIG. 9) among the fixed contacts of the operation mode changeover switch 63. The other terminals are connected to a commercial power source via the temperature fuse 82 and the main heater 23a of the second-stage shelf board 20. A series connection circuit of the auxiliary heater 23b and the relay switches X2 and X1 provided in parallel is connected to the main heater 23a in parallel. One terminal of the other circuit of the first thermostat 71 is connected to the normally open contact of the relay switch X2. The relay switch X2 has a common terminal connected to the commercial power supply, and a normally open contact connected to the commercial power supply via a parallel connection circuit of the relay coils X3 and X6. The normally closed contact of the relay switch X2 is connected to the second dew-proof heater 31a, the series circuit of the relay switch X5 and the evaporating dish heater 54a, and the power supply terminal of the third thermostat 73.

  One of the temperature control terminals of the third thermostat 73 is connected to a commercial power supply, and the other is connected to the commercial power supply via the relay coil X1. A series connection circuit of a relay switch X6 and a relay coil X5 is connected in parallel to the relay coil X1.

  Of the fixed contacts of the operation mode switch 63, the contact 63d corresponding to the fourth operation mode (indicated as “4H” in FIG. 9) is connected to the relay switch X2 and the power terminal of the second thermostat 72. ing. To the second thermostat, the temperature fuse 83 and the product shelf heater 23 of the third shelf 20, the temperature fuse 84 and the product shelf heater 23 of the lowermost shelf 20 are connected. Moreover, the compressor 51 and the relay switch X1 are connected in series with the commercial power source.

  Next, the operation of this control circuit will be described. The relationship between the operation of each heater and the compressor in each operation mode is the same as that described above with reference to the timing charts of FIGS.

  When the operation mode switch 63 is in the first operation mode, the first dew-proof heater 32a is energized by the switch 63. The third thermostat 73 for cooling is connected to a commercial power source via the normally closed contact of the relay switch X2, and this relay coil X2 is used when the operation mode changeover switch 63 is in the fourth operation mode. Therefore, the third thermostat 73 operates in the first operation mode. Thereby, the compressor 51 is energized and controlled. The second dew-proof heater 31a and the evaporating dish heater 54a connected to the normally closed contact of the relay coil X2 are energized. In this operation mode, since the first thermostat 71 and the second thermostat 72 are not energized, the merchandise shelf heater 23 of each shelf board 20 is not energized.

  When the operation mode switch 63 is in the second operation mode, the first thermostat 71 is operated by the switch 63. Thereby, energization control of the main heater 23a of the uppermost shelf 20 is performed. Moreover, in this operation mode, since the relay coil X3 is not energized, the relay coil X4 is thereby energized. As a result, the energization of the auxiliary heater 23b of the uppermost shelf 20 connected in series with the relay coil X4 is controlled. On the other hand, since the product shelf heater 23 (the main heater 23a and the auxiliary heater 23b) of the second shelf 20 and the second thermostat 72 are not energized, the product shelf heater of the product shelf 20 from the second to the bottom 23 is not energized. The operations of the compressor 51, the second dew proof heater 31a, and the evaporating dish heater 54a are the same as in the first operation mode.

  When the operation mode changeover switch 63 is in the third operation mode, the relay coil X3 is energized by the switch 63, whereby the power is supplied to the first thermostat 71 via the relay switch X3 and the operation state is set. In addition, the relay coil X6 is energized by the switch 63, whereby the relay coil X5 connected to the third thermostat 73 becomes a target of energization control by the thermostat 73. Since the normally closed contact of the relay switch X5 is connected in series with the auxiliary heater 23b of the first-stage shelf plate 20, the auxiliary heater 23b is in the first thermostat only when the power supply to the compressor 51 is stopped. The energization control by 71 is received. Further, since the evaporating dish heater 54a is also connected in series with the normally closed contact of the relay switch X5, it is energized only when the energization of the compressor 51 is stopped. Further, since the auxiliary heater 23b of the second-stage shelf 20 is connected in series with the normally closed contact of the relay switch X1 corresponding to the compressor 51, the auxiliary heater 23b is not energized to the compressor 51. Only the first thermostat 71 is energized. The operations of the compressor 51 and the second dew-proof heater 31a are the same as in the first operation mode.

  When the operation mode changeover switch 63 is in the fourth operation mode, the second thermostat 72 is operated by the switch 63. Further, since the relay coil X2 connected in parallel with the second thermostat 71 is energized, the relay coil X3 is energized via the relay switch X2, thereby supplying power to the first thermostat 71 via the relay switch X3. It becomes an operation state. Accordingly, the main heater 23 a and the auxiliary heater 23 b of the uppermost shelf 20 and the main heater 23 a of the second shelf are subjected to energization control by the first thermostat 71. The product shelf heaters 23 of the third and lowermost shelf plates 20 are energized and controlled by the second thermostat 72. In addition, energization of the third thermostat 73, the second dew-proof heater 31a, and the evaporating dish heater 54a is stopped by energization of the relay coil X2.

  By the operation as described above, each heater and compressor in each operation mode operate in a relationship as shown in the timing charts of FIGS. Other operations and effects of the present embodiment are the same as those of the first embodiment.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to this. Hereinafter, modifications of the present invention will be described.

  In each of the above-described embodiments, the product shelf heater 23 of the product shelf 20 is constituted by a plurality of heaters called main heaters 23a and 23b, and energization control is performed so that only some of the heaters are within a predetermined temperature range. However, other means may be used as means for reducing power consumption. For example, the alternating current waveform may be shaped by a half-wave rectifier circuit, a Zener diode, or the like to reduce the power supplied to the product shelf heater 23. Further, for example, the supply voltage to the commodity shelf heater 23 may be lowered by a high voltage circuit such as a transformer circuit. Moreover, you may make it reduce the electric power supplied to the merchandise shelf heater 23 with an inverter circuit. If these power consumption reduction methods are used, the product shelf heater 23 does not need to be divided into the main heaters 23a and 23b, but may be combined with the power consumption reduction control by the main heaters 23a and 23b as necessary.

  In each of the above embodiments, the power consumption reduction control of the evaporating dish heater 54a is also performed. However, if the maximum power consumption can be suppressed to a predetermined value or less in the entire showcase, the control can be omitted. Good. In other words, if the maximum power consumption can be suppressed to a predetermined value or less in the entire showcase, the heaters to be subjected to power consumption reduction control can be arbitrarily combined.

External perspective view of showcase Side cross-sectional view of showcase Floor plan of product shelf Schematic block diagram of a control device according to the first embodiment Timing chart explaining the operation of the showcase Timing chart explaining the operation of the showcase Timing chart explaining the operation of the showcase Timing chart explaining the operation of the showcase Circuit diagram of showcase according to second embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Showcase main body, 15 ... Back plate, 17 ... Product storage part, 20 ... Product shelf, 21 ... Shelf plate, 23 ... Product shelf heater, 23a ... Main heater, 23b ... Auxiliary heater, 30 ... Ventilation path, 31 ... Air suction port, 31a ... second dew-proof heater, 32 ... air discharge port, 32a ... first dew-proof heater, 33 ... duct contact plate, 34 ... duct insertion hole, 35 ... opening / closing plate, 36 ... blower, 37 ... cooler, 40 ... cold air distribution duct, 50 ... machine room, 51 ... compressor, 52 ... condenser, 53 ... blower, 54 ... evaporating dish, 54a ... evaporating dish heater

Claims (6)

A showcase body having a product storage portion formed inside, a cooling device for supplying cold to the product storage portion, one or more product shelves arranged in the product storage portion, and a product shelf heater attached to the product shelf In a showcase provided with a control device for controlling power supply to the cooling device and the product shelf heater,
The control device includes a cooling control that intermittently supplies power to the cooling device so that the internal temperature of the object to be cooled falls within a predetermined temperature range, and the temperature of the product shelf to be heated is within a predetermined temperature range. In addition to performing heating control to supply power to the product shelf heater so that it fits in,
In the heating control, the power consumption of the product shelf heater while the power supply to the cooling device in the cooling control is turned on by the intermittent control, the power supply to the cooling device in the cooling control is the intermittent control. A showcase that controls power supply to a product shelf heater so as to be less than the power consumption of the product shelf heater while it is off . A plurality of product shelf heaters are attached to the product shelf,
Said controller, while the power supply to the cooling device is turned off by the intermittent control as well as operation control all shelves heater, power supply to the cooling device is turned on by the intermittent control The showcase according to claim 1, wherein the operation control of some of the commodity shelf heaters is stopped. The plurality of product shelf heaters include a first product shelf heater and a second product shelf heater, the first product shelf heater is disposed at a peripheral portion of the product shelf, and the second product shelf heater is a first product shelf heater. Placed inside the product shelf heater,
The control device controls the operation of the first and second commodity shelf heaters while the power supply to the cooling device is turned off by the intermittent control , and the power supply to the cooling device is turned on by the intermittent control. The showcase according to claim 2, wherein the operation control of the second commodity shelf heater is stopped during the period . An evaporating dish for receiving drain water, and an evaporating dish heater attached to the evaporating dish,
The control device controls power supply to the evaporating dish heater so that power consumption of the evaporating dish heater is reduced while power supply to the cooling device is turned on by the intermittent control. Item 1. A showcase according to item 1. Wherein the controller, along with while the power supply to the cooling device is turned off by the intermittent control operates controls evaporating dish heater, while the power supply to the cooling device is turned on by the intermittent control The showcase according to claim 4, wherein the operation control of some of the evaporating dish heaters is stopped. The said control apparatus switches whether to perform power consumption control of the said product shelf heater according to the number of the product shelves provided with the product shelf heater which is the object of operation control. The showcase of any one of thru | or 5.

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