JP6884668B2 - Showcase - Google Patents

Description

An embodiment of the present invention relates to a showcase having a display room in which a plurality of shelves for placing products are arranged, and an electric heater is provided on the shelves of the display room.

Showcases that display and sell products such as canned beverages and bottled beverages while warming them have multiple shelves for placing products in the display room, and each shelf has a plurality of, for example, three electric heaters and each electric heater. It is equipped with a plurality of temperature sensors such as three thermistors according to the mounting position of the above.

Each electric heater on one shelf is connected to the control board via a pair of lead wires, and each temperature sensor on one shelf is also connected to the same control board via a pair of signal lines. The control unit mounted on the control board controls the energization of the electric heater of each shelf so that the detection temperature of the temperature sensor of each shelf becomes the set temperature.

Japanese Patent No. 3857933 Japanese Unexamined Patent Publication No. 2009-233128

When three electric heaters and three temperature sensors are installed on one shelf, six lead wires for electric heaters are connected between one shelf and the control board, and for the temperature sensor. Six signal lines are connected. The number of wires for these lead wires and signal wires is proportional to the number of shelves. If the number of shelves is 7, for example, a total of 84 wires, 42 lead wires and 42 signal lines, are required.

The wiring work of routing a large number of these wires from the control board to each shelf causes the showcase manufacturing process to become complicated and the cost to increase.

An object of the embodiment of the present invention is to provide a showcase in which the number of wirings can be reduced, thereby simplifying the manufacturing process and reducing the cost.

The showcase of claim 1 has a display chamber provided in the main body of the showcase; and a multi-level shelf for mounting products that can be detachably attached in the vertical direction of the display chamber and the mounting positions can be exchanged. ; the plurality of electric heaters attached to each shelf; a plurality of temperature sensors attached to the each shelf; disposed to the each shelf, a plurality of heater circuits equipped with a heater control unit, each having a unique address A substrate; an address setting unit mounted on these heater circuit boards and having an operating means for setting the address of the heater control unit on each heater circuit board; and a main control unit that controls each heater control unit. With the mounted main control board; with a plurality of relay boards arranged at or near the mounting position of each shelf of the showcase main body; via the relay boards between the main control board and the heater circuit boards. With the connected wiring; Each heater control unit notifies the main control unit of the detection temperature of the corresponding temperature sensor together with the address of the heater control unit, and the setting output instructed by the main control unit to energize the corresponding electric heater. Control according to. Each of the relay boards is connected in a string by the wiring. Each heater control unit notifies the main control unit of the detection temperature of the corresponding temperature sensor via the wiring together with the address of the heater control unit, and energizes the corresponding electric heater from the main control unit. Control according to the indicated setting output. The main control unit sets the output of each electric heater based on the detection temperature and the address notified from the heater control unit, and sends these set outputs to the heater control unit corresponding to the address. Instructed via the wiring.

The figure which shows the structure of one Embodiment in cross section. The figure which shows the arrangement of the electric heater and the temperature sensor in each shelf of the same embodiment. The block diagram which shows the electric wiring of each heater circuit board, each relay board, and a main control board of the same embodiment. The flowchart which shows the control of the same embodiment. The block diagram which shows the electric wiring of each heater circuit board, each relay board, and a main control board in the modified example of the same embodiment.

Hereinafter, one embodiment will be described with reference to the drawings. The configuration of the showcase is shown in cross section in FIG. 1, and the configuration of the electric heater and the temperature sensor arranged on each shelf is shown in FIG.

The showcase main body 1 is provided with a top plate 2 at the top and a machine room 3 at the bottom, and a product display room 4 is provided between the top plate 2 and the machine room 3. The display room 4 has an open front surface 4a and is surrounded by double-glazed glass having high heat insulation on both sides. The display room 4 has a bottom surface 5 that also serves as a ceiling surface of the machine room 3 and a back surface 1a of the showcase body 1. It is surrounded by a back plate 6 which is erected along the display shelf and serves as the back surface (back surface) of the display shelf, and a ceiling surface 7 which is arranged along the top plate 2 of the showcase main body 1. A shopper standing in front of or beside the showcase main body 1 can easily put his / her fingers in and out of the display room 4 through the front surface 4a. The ceiling surface 7 is formed of a heat insulating material such as Styrofoam.
In the display room 4, a plurality of shelves 8a to 8 g for placing products, for example, seven shelves, are sequentially arranged in the vertical direction of the showcase main body 1 at predetermined intervals. As shown in FIG. 2, the shelf 8a includes a mounting piece 40 at the end edge on the side corresponding to the back plate 6. The shelf 8a is placed on the back plate by inserting the mounting piece 40 into the mounting portion 9 arranged on the back plate 6 and placing it on the arm-shaped support portions (not shown) attached to both side portions. It can be attached to 6. The shelf 8a can be removed from the back plate 6 by slightly lifting the mounting piece 40 from the support portion and pulling it out from the mounting portion 9. The other shelves 8b to 8g also have the same mounting pieces 40, and a plurality of mounting portions 9 corresponding to the mounting pieces 40 are sequentially arranged on the back plate 6.

Products for sale, such as a large number of canned beverages and bottled beverages, can be placed on the shelves 8a to 8g. The space existing between the ceiling surface 7 and the shelves 8a and the space existing between the shelves 8b to 8g serve as a storage space for goods and a space for heating / cooling.

A partition plate 10 made of a heat insulating material such as Styrofoam is arranged in a space between the back plate 6 of the display room 4 and the back surface 1a of the showcase main body 1. The partition plate 10 divides the space between the back plate 6 and the back surface 1a into a duct 11 for cold air circulation and a duct 12 for exhaust air. These ducts 11 and 12 extend along the vertical direction of the showcase main body 1.

On the back plate 6, cold air outlets 6a are formed at positions between the ceiling surface 7 and the shelves 8a and at positions between the shelves 8b to 8g, respectively. These cold air outlets 6a communicate with the internal space of the duct 11. The lower part of the duct 11 communicates with the vent 5b formed in the innermost part of the bottom surface 5, and the upper part of the duct 11 communicates with the vent 7a formed in the innermost part of the ceiling surface 7. An evaporator (heat exchanger) 21 is arranged below the duct 11.

The ventilation port 7a of the ceiling surface 7 communicates with the duct 13 formed between the ceiling surface 7 and the top plate 2, and the duct 13 communicates with the cold air outlet 7b formed at the foremost portion of the ceiling surface 7. The cold air outlet 7b is formed in a U shape at positions corresponding to the front surface (opening) 4a and both side surfaces (openings) of the display chamber 4. The cold air rising in the duct 11 through the evaporator 21 passes through the vent 7a and the duct 13, and flows downward from the cold air outlet 7b along the front surface (opening) 4a and both side surfaces (openings) of the display chamber 4. The cold air that has flowed downward flows into the vents 5a formed from the frontmost portion to both side portions of the bottom surface 5.

The vent 5a on the bottom surface 5 communicates with the duct 23 formed on the lower surface side of the bottom surface 5, and the duct 23 communicates with the vent 5b at the innermost part of the bottom surface 5. A fan 24 for circulating cold air is arranged in the duct 23. As the fan 24 rotates, air flows into the vent 5a, and the inflowing air flows into the duct 11 through the duct 23 and the vent 5b. The air flowing through the duct 11 is cooled by the evaporator 21 and rises in the duct 11.

A partition plate 22 is attached at a position in the middle of the duct 11, for example, between the shelves 8c and the shelves 8d. The partition plate 22 stops the flow of cold air rising in the duct 11 via the evaporator 21, and can be freely attached to and removed from the duct 11 at an arbitrary position in the vertical direction. As shown in the figure, by attaching the partition plate 22 between the shelves 8c and the shelves 8d, the cold air in the duct 11 passes through each cold air outlet 6a below the partition plate 22 and is between the shelves 8d to 8 g. Flows into the space of. Cold air does not flow above the partition plate 22. By attaching the partition plate 22, the space existing between the shelves 8d to 8g can be used as a space for cooling the product, and the space existing between the ceiling surface 7 and the shelves 8a to 8c is used for heating the product. It can be used as a space.

A compressor 31, a condenser 32, an expansion valve (decompressor) 33, and a fan 34 are arranged in the machine room 3. Then, the compressor 31, the condenser 32, the expansion valve 33, and the evaporator 21 installed in the lower part of the duct 11 outside the machine room 3 are sequentially connected by the refrigerant pipes to form a refrigeration cycle. The compressor 31 sucks in the refrigerant, compresses it, and discharges it. The high-temperature and high-pressure gas refrigerant discharged from the compressor 31 flows into the condenser 32. The gas refrigerant flowing through the condenser 32 exchanges heat with the outside air sucked by the operation of the fan 34 and condenses. The liquid refrigerant flowing out of the condenser 32 flows to the evaporator 21 through the expansion valve 33. The liquid refrigerant flowing through the evaporator 21 exchanges heat with the air sent from the fan 24 and evaporates. The gas refrigerant flowing out of the evaporator 21 is sucked into the compressor 31. A vent 3a for taking in outside air is formed on the front surface of the machine room 3, and a condenser 32 is arranged at a position facing the vent 3a. The outside air that has flowed in from the vent 3a and passed through the condenser 32 is discharged above the showcase main body 1 through the exhaust duct 12.

An illumination unit 14 using a fluorescent lamp or a light emitting diode (LED) is arranged on the upper part of the front surface of the showcase main body 1. The lighting unit 14 has a length along the upper edge of the front surface 4a of the display room 4, illuminates the display room 4, and transmits and illuminates the upper front surface of the showcase main body 1.

The heater circuit board 60 is attached to the lower surface of the shelves 8a to 8g. The relay board 70 is mounted on the back plate 6 at or near the mounting positions of the shelves 8a to 8 g, that is, on the back side of the back plate 6, that is, on the back surface of the surface forming the display chamber 4. Further, a control box 15 is arranged on the upper surface of the top plate 2, and a main control board 80 for controlling the entire showcase is arranged in the control box 15.

As shown in FIG. 2, a spiral electric heater 41 for heating is embedded in the shelf 8a at a substantially central position along the left-right width direction of the showcase main body 1, and spirals for heating are embedded on both sides of the electric heater 41. The electric heaters 42 and 43 in the shape are embedded. Both ends of each of these electric heaters 41 to 43 are gathered at a connector 44 attached to the end edge on the mounting piece 40 side, and lead wires are connected to a heater circuit board 60 on the lower surface side of the shelf 8a via the connector 44. It is connected. By arranging the plurality of electric heaters 41 to 43 in a distributed manner in this way, the temperature of the products on the shelves can be kept as uniform as possible. If the number of heaters is further increased, the temperature can be made more uniform, but the effect of homogenization is not so improved as compared with the complexity of the structure, so it is appropriate to have about 2 to 5 heaters. ..

Further, on the shelf 8a, temperature sensors 51 to 53 are embedded in the vicinity of the electric heaters 41 to 43, respectively. These temperature sensors 51 to 53 are also connected to the heater circuit board 60 on the lower surface side of the shelf 8a by lead wires. When a current flows from the heater circuit board 60 to the electric heaters 41 to 43, the electric heaters 41 to 43 generate heat. This heat generation heats the shelves 8a and the goods on the shelves 8a. Then, the temperatures of the shelves 8a and the products are detected by the temperature sensors 51 to 53. The temperature sensors 51 to 53 may be fixed to the surface of the shelf 8a as long as they can be thermally sufficiently contacted and the shelf temperature can be detected without being embedded. The number of temperature sensors 51 to 53 and the number of electric heaters 41 to 43 are the same so that changes in the shelf temperature due to the operation of the following electric heaters 41 to 43 can be appropriately detected, but the surface temperature of the shelf 8a. The number of temperature sensors is not limited to three, and may be increased or decreased as long as the temperature can be controlled uniformly.

Similarly, electric heaters 41 to 43 and temperature sensors 51 to 53 are embedded in the other shelves 8b to 8g, and these electric heaters 41 to 43 and temperature sensors 51 to 53 are attached to the lower surface side of the shelves 8b to 8g. Lead wires are connected to the heater circuit board 60, respectively. The electrical wiring of each heater circuit board 60, each relay board 70, and the main control board 80 is shown in FIG.

The main control board 80 is connected to the three-phase AC power supply 90 via the power supply line 91, and each heater circuit board 60 is connected to the main control board 80 via the power supply line 91. Although the power supply line 91 is shown by one line, it is actually three, and the power supply voltage is supplied to each heater circuit board 60. The main control board 80 includes a main control unit (MCU) 81 composed of a microcomputer and its peripheral parts, a switch 82 that opens and closes a power supply line 91 in response to a command from the main control unit 81, and a connector for connecting a signal line. 5 terminals) 83 and the like are installed.
Each heater circuit board 60 is provided with a heater control unit (MCU) 61 composed of a microcomputer and its peripheral portions, a connector (3 terminals) 62 to which a power supply line 91 is connected, and a voltage input via the connector 62. Drive circuit 63 that converts to drive voltage and supplies the heater drive voltage to electric heaters 41 to 43 at the energization rate (on, off duty) according to the command from the heater control unit 61, connector for wiring connection (5) The terminal) 64, the address setting unit 65 for setting the address of the heater control unit 61, and the like are mounted. The electric heaters 41 to 43 are connected to the drive circuit 63 via a pair of lead wires, and the temperature sensors 51 to 53 are connected to the heater control unit 61 via a pair of lead wires. The drive circuit 63 includes switch elements such as a triac that can turn on / off the voltage supply from the three-phase power supply 90 to each of the electric heaters 41 to 43 at an arbitrary timing. The address setting unit 65 includes a plurality of DIP switches for address setting, and can set a unique address for each heater circuit board 60 according to the operation of these DIP switches. At the time of shipment or by the user, the DIP switches of the address setting unit 65 of all the shelves 8a to 8g are operated in advance so that the same addresses do not overlap. As a result, each address and the shelves 8a to 8g are uniquely associated with each other. The address setting unit 65 is not limited to the DIP switch, and any means may be used as long as it is an operation unit that can be manually operated and can set at least seven addresses.

A connector (5 terminals) 71, 72, 73 for wiring connection is mounted on each relay board 70. Then, the wiring 92 is connected between the connector 83 of the main control board 80 and the connector 71 of the relay board 70 corresponding to the first shelf 8a, and between the connector 71 of the relay board 70 and the connectors 72, 73. Wiring 92 is also connected to each. Further, a wiring 92 is connected between the connector 72 of the relay board 70 and the connector 64 of the heater circuit board 60 on the shelf 8a. Each wiring 92 is simply a branched wiring through which the same voltage or signal flows.

The wiring 92 is connected between the connector 73 of the relay board 70 corresponding to the shelf 8a and the connector 71 of the relay board 70 corresponding to the second shelf 8b, and the connector 71 and the connectors 72 and 73 of the relay board 70 Wiring 92 is also connected between them. Further, a wiring 92 is connected between the connector 72 of the relay board 70 and the connector 64 of the heater circuit board 60 on the shelf 8b. That is, the relay boards 70 of the shelves 8a to 8g are sequentially connected in a string by wiring 92 in advance from the upper side to the lower side, that is, from the upper shelf to the lower shelf. Since there is no shelf at the end of the connector 73 of the relay board 70 of the shelf 8 g, which is the final stage, the wiring 92 is not connected at the end, and the connector 73 is not used. Therefore, it is possible not to provide the connector 73 itself in the relay board 70 of the shelf 8 g which is the final stage, but in order to standardize the relay boards 70 of each shelf 8a to 8 g in the same manner, the final stage shelf. The connector 73 is also provided on the 8 g relay board 70. Similarly, the wiring 92 is connected to each of the relay boards 70 and the heater circuit boards 60 corresponding to the shelves 8c to 8g of the third to seventh stages.

Each relay board 70 is attached to the back side of the back plate 6, and is a wiring between the connector 83 of the main board 80 and the connector 71 of the relay board 70 of the uppermost shelf 8a, and the relay board 70 of each upper shelf. The wiring 92 between the connector 73 and the connector 71 of the relay board 70 on the lower shelf immediately below the connector 73 is connected in advance on the back side of the back plate 6 so that the wiring 92 is not exposed in the display chamber 4. As a result, the appearance is improved, and the shelves 8a to 8g are not disturbed when the shelves are replaced or the height position is adjusted. The wiring 92 between the connector 72 of the relay board 70 and the connector 64 of the heater circuit board 60 provided on each shelf is connected by the user when the shelves 8a to 8g are installed.
Although the wiring 92 is shown by one line in the drawing, it is actually composed of five lines. That is, the wiring 92 is the first power supply line (12V line) 92a (in the figure, the terminals of the connectors 83, 71 to 73) that supply the operating voltage (DC 12V voltage) from the main control board 80 to each heater circuit board 60. Wiring connected to 1 ”), GND wire 92n (wiring connected to terminals“ 5 ”of connectors 83, 71 to 73 in the figure), and this GND wire 92n from the main control board 80 to each heater circuit board 60. Second power supply line (5V line) 92b (wiring connected to terminal "2" of connectors 83, 71 to 73 in the figure) that supplies control voltage (DC 5V), main control unit from each heater control unit 61 The first signal line 92c (wiring connected to the terminals "3" of connectors 83, 71 to 73 in the figure) that notifies the detection temperature and address to 81, from the main control unit 81 to each heater control unit 61. The second signal line 92d (wiring connected to the terminals “4” of the connectors 83, 71 to 73 in the figure) for instructing the setting output is included. The first signal line 92c and the second signal line 92d are serial signal lines that transmit information by means of a pulsed voltage serial signal with the GND line 92n as a reference potential, respectively. Each heater control unit 61 operates by a voltage (DC 5V voltage) supplied from the main control board 80 via the second power supply line 92a and the GND line 92n, and the temperature sensors 51 to 53 corresponding to the heater control unit 61 are operated. Is notified to the main control unit 81 via the first signal line 92c and the GND line 92n together with the address of the heater control unit 61, and the drive circuit 63 to the electric heaters 41 to 43 corresponding to the heater control unit 61. The energization from the main control unit 81 is controlled according to the set output instructed from the main control unit 81 via the second signal line 92d and the GND line 92n.

The main control unit 81 notifies from each heater control unit 61 of the shelves 8a to 8c for which the heating mode is set, for example, via the first signal line 92c and the GND line 92n among the heater control units 61 of the shelves 8a to 8g. The outputs of the electric heaters 41 to 43 on the shelves 8a to 8c are set based on the detected temperature and the address to be detected, and these set outputs are set to the heater control units 61 of the shelves 8a to 8c corresponding to the addresses of the heater control units 61. Is instructed via the second signal line 92d and the GND line 92n. Here, the three temperature sensors 51 to 53 and the three electric heaters 41 to 43 on the shelves 8a to 8c have communication specifications that can be identified in the communication between the main control unit 81 and each heater control unit 61. ing.

The flowchart of FIG. 4 shows the control of each heater control unit 61 and main control unit 81 of the shelves 8a to 8c in which the heating mode is set, for example. Reference numerals S1 to S5 are symbols indicating processing steps.

The heater control unit 61 of the shelf 8a detects the temperature of the shelf 8a and the temperature of the product on the shelf 8a by the temperature sensors 51 to 53 (S1), and detects the detected temperature (digital signal) together with the address of the heater control unit 61. Notify the main control unit 81 (S2). The heater control units 61 of the shelves 8b and 8c also execute the same control.

The main control unit 81 reads the set temperature (set temperature for the shelf 8a) corresponding to the heater control unit 61 from the internal memory based on the address notified from the heater control unit 61 of the shelf 8a, and reads the set temperature and the shelf 8a from the internal memory. The difference from the detected temperature notified from the heater control unit 61 of the above is detected, and the outputs of the electric heaters 41 to 43 required to eliminate the detected temperature difference are set (S3). Then, the main control unit 81 assigns the address of the heater control unit 61 of the shelf 8a and instructs the heater control unit 61 of this set output (S4). The main control unit 81 executes the same control for each of the heater control units 61 of the shelves 8b and 8c. The wiring 92 is connected in parallel to all the shelves 8a to 8g, but the address of each shelf notified via the second signal line 92d indicates whether the instruction is to itself or to another shelf. The heater control unit 61 is controlled only when the determination is made and an instruction is given to itself.

The heater control unit 61 of the shelf 8a energizes the electric heaters 41 to 43 of the shelf 8a from the drive circuit 63 so that the output of the electric heaters 41 to 43 of the shelf 8a becomes the set output instructed by the main control unit 81. The rate (on, off duty) is controlled (S5). The heater control unit 61 on the shelf 8b and the heater control unit 61 on the shelf 8c also execute the same control. As described above, the heater circuit boards 60 are provided on the shelves 8a to 8g, the heater circuit boards 60 are connected to the three-phase AC power supply 90 via the power supply line 91, and the heater circuit boards 60 are provided on the shelves 8a to 8g. By connecting the electric heaters 41 to 43 to the heater circuit boards 60, respectively, it is not necessary to route a long lead wire from the electric heaters 41 to 43 on each shelf to the main control board 80.

The main control unit 81 of the main control board 80 and the heater control unit 61 of each heater circuit board 60 are connected by wiring 92, and the main control unit 81 is connected to each heater control unit 61 based on the address of each heater control unit 61. Since the output of each heater control unit 61 is set and the set output is commanded to each heater control unit 61 while recognizing the detected detection temperature to be notified, the electric heaters on each shelf are wired and connected to the main control board 80. However, the number of wires between the main control board 80 and the shelves 8a to 8g can be significantly reduced. Since the wiring work is reduced, the manufacturing process of the showcase can be simplified and the cost can be reduced.
Since the relay boards 70 are arranged in the vicinity of the mounting positions of the shelves 8a to 8g and the main control board 80 and each heater circuit board 60 are connected by signal lines via the relay boards 70, the shelves 8a to 8g are displayed. When installing in the chamber 4, each heater circuit board 60 can be easily connected to the main control board 80 by a signal line.

In the above embodiment, the address setting unit 65 is mounted on each heater circuit board 60, but as shown in FIG. 5, the address setting unit 65 is mounted on each relay board 70 and each address setting unit is mounted. The 65 and the heater control unit 61 of each heater circuit board 60 may be connected by a third signal line 92x added to the wiring 92. A 6-terminal type is used as the connector 64 of each heater circuit board 60 and the connector 72 of each relay board 70, and the third signal line 92x is connected to the terminal “6” of each of the connectors 64 and 72. As a result, each heater control unit 61 can recognize the address of its own heater circuit board 60 by reading the setting of the DIP switch of the address setting unit 65 via the third signal line 92x and the GND line 92n.

According to this configuration, when the shelves 8a to 8g are removed by cleaning or the like and reattached to the display room 4, or when the mounting positions of the shelves 8a to 8g are exchanged, the positions of the shelves 8a to 8g and each heater circuit board 60 The shelves 8a to 8g can be easily attached without the work of confirming the correspondence with the address. That is, an appropriate address can be set for each of the heater circuit boards 60 of the shelves 8a to 8g without confirming the correspondence between the positions of the shelves 8a to 8g and the addresses of the heater circuit boards 60. The manufacturing process can be further simplified. In the above embodiment, a showcase having three electric heaters 41 to 43 and three temperature sensors 51 to 53 on one shelf has been described as an example, but the number of electric heaters and temperature sensors is the capacity of the showcase main body 1. It can be appropriately selected according to the size of the shelves 8a to 8g and the like. The number of shelves can be selected as appropriate. Further, some lower shelves may be dedicated to cooling and the electric heater may be eliminated, and a plurality of upper shelves, for example, only four shelves from the top may be heated shelves with electric heaters.

Further, communication between each heater control unit 61 and the main control unit 81 was performed by two lines, the first signal line 92c and the second signal line 92d, but each heater control unit 61 and the main control unit 81 transmit and receive each other. By making it possible, the signal lines between the two may be combined into one. In the above embodiment, the one-sided open type open showcase has been described as an example, but the present invention is not limited to this, and the same can be applied to a three-sided open type open showcase in which the left and right sides are also open.

In addition, the above-described embodiments and modifications are presented as examples, and the scope of the embodiments and modifications is not intended to be limited. This novel embodiment and modification can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist. These embodiments and modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Showcase body, 2 ... Top plate, 3 ... Machine room, 4 ... Display room, 6 ... Back plate, 6a ... Cold air outlet, 7 ... Ceiling plate, 8a-8g ... Shelf, 9 ... Mounting part, 11, 13 ... Duct, 21 ... Evaporator, 22 ... Partition plate, 23 ... Duct, 24 ... Fan, 31 ... Compressor, 32 ... Condenser, 34 ... Fan, 40 ... Mounting piece, 41, 42, 43 ... Electric heater , 51, 52, 53 ... Temperature sensor, 60 ... Heater circuit board, 61 ... Heater control unit, 62 ... Connector, 63 ... Drive circuit, 64 ... Connector, 65 ... Address setting unit, 70 ... Relay board, 71, 72, 73 ... Connector, 80 ... Main control board, 81 ... Main control unit, 82 ... Switch, 83 ... Connector, 92 (ad, n) ... Wiring

Claims (4)

The display room provided in the showcase body and
A multi-level shelf for product placement that can be detachably mounted in the vertical direction in the display room and the mounting position can be exchanged.
The electric heater attached to each shelf and
The temperature sensor attached to each shelf and
Wherein arranged in each shelf, a plurality of heater circuit board mounted with the heater control unit, each having a unique address,
An address setting unit mounted on each heater circuit board and having an operating means for setting the address of the heater control unit on each heater circuit board.
A main control board equipped with a main control unit that controls each heater control unit,
A plurality of relay boards arranged at or near the mounting position of each shelf of the showcase main body, and
Wiring connected between the main control board and each heater circuit board via the respective relay boards, and
With
Each of the relay boards is connected in a string by the wiring.
Each heater control unit notifies the main control unit of the detection temperature of the corresponding temperature sensor via the wiring together with the address of the heater control unit, and energizes the corresponding electric heater from the main control unit. Control according to the indicated setting output,
The main control unit sets the output of each electric heater based on the detection temperature and the address notified from the heater control unit, and sends these set outputs to the heater control unit corresponding to the address. Instructed via the wiring ,
Showcase. The showcase according to claim 1 , further comprising a power supply line for supplying a power supply voltage to each of the heater circuit boards. The wiring supplies a control voltage from the main control board to each heater circuit board together with a first power supply line and a GND line that supply an operating voltage from the main control board to each heater circuit board, and the GND line. A second power supply line, a first signal line that notifies the detection temperature and the address from each heater control unit to the main control unit together with the GND line, and the setting from the main control unit to each heater control unit. Includes a second signal line that gives output instructions along with the GND line
The showcase according to claim 1 or 2. The plurality of relay boards are provided on the back plate which is the back surface of the display shelf, and the plurality of relay boards are provided.
Each of the relay boards is connected in advance by the wiring from the upper shelf to the lower shelf in a string of beads.
The showcase according to any one of claims 1 to 3.

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