JP2011252691A - Machine room of showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce temperature of electronic parts in a control panel without depending on exhaust, as a countermeasure against temperature rise inside the control panel due to waste heat of refrigerating machine units, in a built-in type show case in which a machine room where a compression type refrigerating device is installed and a box constituting a display chamber of commodity are united, out of a freezing/refrigerating show case intended to sell and display food.SOLUTION: The machine room in which a refrigerating device comprising a condenser, a compressor or the like, an electrical equipment box and a drain water receiver are installed, is formed below a show case body. In the machine room, a heat-resistant tube 12 made of metal or synthetic resin is meandered and arranged between heat radiation plates 10 of a control device of the electrical box, liquid as refrigerant is made to flow in the heat-resistant tube 12. The liquid is drain water and is pumped up by a drain pump.

Description

  The present invention relates to a machine room of a built-in type showcase among freezer / refrigerated showcases.

  An open type vertical freezer / refrigeration showcase installed in a store such as a supermarket is composed of a condenser 2 and a compressor 5 in a machine room 3 formed at the lower part of the showcase body as shown in FIG. The product stored in the product storage 1 is cooled with cold air cooled by a cooler installed on the back side of the showcase body, and the cold air is circulated. In the figure, 4 is a drain water receiver, 9 is an ultrasonic sensor as a water level detection device, 6 is an evaporation plate, 7 is an electrical box as a showcase controller, and inside this electrical box 7 is an inverter drive board and other control devices. Is stored.

  Reference numeral 8 denotes a full water warning lamp provided in the electrical box 7.

As shown in Patent Document 1 below, the ultrasonic sensor 9 is used as a water level sensor. The ultrasonic sensor 9 is installed above the drain water receiver 4, and the ultrasonic wave transmitted from here toward the water surface is reflected on the water surface. The time until it is received back is measured to measure the distance between the ultrasonic sensor 9 and the water surface, that is, the water level.
JP 2007-333281 A

  By the way, when a built-in refrigeration / refrigeration showcase is installed in a store, the refrigerator unit is stored in a machine room in a frame surrounded by a decorative panel or other outer plate, Waste heat was forcibly discharged from the waste heat opening provided on the decorative panel or the outer plate naturally or with a fan or the like, but when there were other cases on the left and right, walls on the back, etc. There is not enough exhaust.

  As a result, the suction temperature of the condenser and the ambient temperature of the machine room are increased, so that the temperature of the electronic board component is increased, the protection is activated, and the normal operation state may not be maintained.

Patent Document 2 below discharges warm air in the control panel into a frame surrounded by a decorative panel by an exhaust fan, and discharges warm air from the control panel and waste heat from the refrigeration cycle components, A waste heat structure of a refrigeration unit that is discharged to the outside by a waste heat fan that can be discharged together is provided.
Japanese Patent Laid-Open No. 7-294093

  This Patent Document 2 includes a compressor, a liquid receiver, an accumulator, and other devices constituting a refrigeration cycle for cooling a refrigeration device such as a showcase or a refrigerator, and a control panel for controlling the refrigeration cycle. In a waste heat structure of a refrigerator unit that is housed in a gantry and a decorative panel that is soundproofed with a sound insulation material is attached around the gantry, heat inside the control panel is placed on the side wall of the control panel in the gantry An exhaust outlet and an exhaust fan are provided, and heat from the inside of the control panel and a compressor, a liquid receiver, an accumulator, and the like constituting the refrigeration cycle are provided on the upper position of the side plate made of the decorative panel or the top plate. A waste heat outlet and a waste heat fan for discharging waste heat are provided.

  According to this patent document 2, the temperature in the control panel has conventionally been raised due to the waste heat of the refrigerator unit, but by providing an exhaust port for forced ventilation by an exhaust fan, Temperature rise can be suppressed.

  In addition, if the control panel exhaust port is provided directly outside, dust or moisture may enter through the exhaust port and adversely affect the equipment in the control panel. Since the exhausted air is exhausted once and then the exhausted air is forcibly exhausted to the outside with a waste heat fan from the waste heat port provided on the top plate etc. together with the waste heat from the refrigerator unit. Dust and moisture from the outside do not enter inside.

  In the above-mentioned patent document 2, as the countermeasure for the fact that the temperature of the electronic board components rises due to the rise of the suction temperature of the condenser and the ambient temperature of the machine room, the protection works, and the normal operation state cannot be maintained. Exhaust air from the panel and exhaust heat from the refrigeration cycle components are exhausted by an exhaust fan. When exhausted by such an exhaust fan, dust, moisture, and other foreign substances do not enter the control panel. It is necessary to devise to make it.

  In Patent Document 2, this is once exhausted into a frame surrounded by a decorative panel, and then the exhausted air is exhausted from a waste heat port provided on a top plate together with waste heat from the refrigerator unit. Therefore, it is necessary to perform two-stage exhaust such as forced exhaust to the outside, which is inefficient and increases the number of fans and the structure.

  An object of the present invention is to solve the disadvantages of the conventional example, and in a freezing / refrigerating showcase for the purpose of selling and displaying food, a box that constitutes a machine room in which a compression refrigeration apparatus is installed and a display room for goods. In the built-in showcase, the temperature of the electronic components in the control panel is reduced without relying on exhaust as a countermeasure against the temperature rise in the control panel due to the waste heat of the refrigerator unit. The goal is to provide a showcase machine room.

  In order to achieve the above object, the present invention according to claim 1 is formed in a lower part of a refrigeration apparatus constituted by a condenser, a compressor, etc., an electrical box, and a showcase body provided with a drain water receiver. In the machine room, a heat-resistant tube made of metal or synthetic resin is meandered between the heat sinks of the control device of the electrical box, and a liquid as a refrigerant flows through the heat-resistant tube.

  According to the first aspect of the present invention, the heat-resistant tube is passed through the valley portion of the heat radiating plate, and the liquid as the refrigerant is flowed therein. Thereby, the heat of the heat sink of the inverter drive board can be removed, and the temperature of the electronic component can be reduced.

  The gist of the present invention described in claim 2 is that the liquid is drain water and is pumped up by a drain pump.

  According to the second aspect of the present invention, in addition to the action of the first aspect, the drainage water is used as the liquid as the refrigerant, so that it becomes ecological.

  The gist of the present invention described in claim 3 is that the drain water after passing through the meandering heat-resistant tube flows into the drain water receiver.

  According to the third aspect of the present invention, the drain water after passing through the meandering heat-resistant tube can be returned to the normal drain water treatment by flowing it into the drain water receiver.

  The gist of the present invention described in claim 4 is that the drain pump is driven and controlled by the output of the water level detector of the drain water receiver.

  According to the fourth aspect of the present invention, the drain water after passing through the meandering heat-resistant tube can be prevented from overflowing by grasping the storage amount of the drain water when flowing into the drain water receiver.

  As described above, the machine room of the showcase of the present invention is a box that constitutes a machine room in which a compression-type refrigeration apparatus is installed and a product display room in a freezing / refrigerated showcase for the purpose of selling and displaying food. In a built-in showcase integrated with the body, the temperature of the electronic components in the control panel can be reduced without relying on exhaust as a countermeasure against the temperature rise in the control panel due to the waste heat of the refrigerator unit. Is something that can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a heat radiating plate of an electrical box of a machine room, showing a first embodiment of a machine room of a showcase according to the present invention. FIG. On the substrate, a heat radiating plate 10 was provided in parallel with an appropriate interval for heat dissipation of the control device.

  As an example, the heat radiating plate 10 is made of an aluminum alloy and protrudes from the base plate 11 with a gap.

  A heat-resistant tube 12 made of metal or synthetic resin is disposed between the heat radiating plates 10 in a meandering manner, and a liquid as a refrigerant is allowed to flow through the heat-resistant tube 12. The heat resistance of the heat-resistant tube 12 is sufficient to withstand the high temperature of the heat sink 10. The heat-resistant tube 12 meanders so as to sew between the heat sinks 10.

  The heat-resistant tube 12 may be a flexible tube made of a heat-resistant vinyl tube. However, in both cases of flexibility and inflexibility, the heat transfer property is good. Must be able to absorb

  The liquid as a refrigerant in the heat-resistant tube 12 is drain water and is pumped up by a drain pump. In addition, with regard to drain water, the freezer and refrigerated showcases installed in stores such as supermarkets, which are an example of refrigeration equipment, have open doors for products in the product storage, so warm outside air flows from here. In order to prevent the moisture contained in the dew from the chiller and form frost, and the frosting prevents the capacity of the cooler from being reduced, the defrosting is appropriately performed, but the defrosted water is generated as drain water.

  This drain water is usually connected to a drain pipe and discharged through this pipe. A drain pump 13 (see FIG. 3) is provided to the drain water, and the drain water is allowed to flow through the heat-resistant tube 12.

  The tip of the heat-resistant tube 12 guides it to the drain water receiver 4, and the drain water after passing through the meandering heat-resistant tube 12 flows to the drain water receiver 4.

  An ultrasonic sensor 9 is installed above the drain water receiver 4, and it takes time for the pulse signal transmitted from the transmission circuit unit that is a pulse oscillation unit of the ultrasonic sensor 9 to be reflected by the water surface and return to the reception circuit unit. Based on this time, the arithmetic processing circuit unit calculates the distance between the ultrasonic sensor 9 and the water surface, that is, the water level. When the water level is full, the drain water full warning lamp 8 is lit and the drain water receiver 4 As shown in FIG. 3, the water level detection output of the drain water receiver 4 of the drain sensor 14 by the ultrasonic sensor 9 is introduced into the control device 14 as shown in FIG. The drain pump 13 is driven and controlled by the output.

  Further, a temperature sensor may be provided on the heat radiating plate 10, a temperature detection output of the heat radiating plate 10 may be introduced into the control device 14, and the drain pump 13 may be driven and controlled by the output from the control device 14.

  Next, the usage will be described. The temperature sensor detects that the temperature of the heat radiating plate 10 has reached a certain level, the drain pump 13 is started by the output from the control device 14, and the heat-resistant tube 12 between the heat radiating plates 10 is connected. Pour drain water. Thereby, the heat of the heat sink 10 of the inverter drive board of the electrical box 7 is taken away, and the temperature of the electronic components and the like is reduced.

  And after passing between the heat sinks 10, it flows into the drain water receiver 4.

  When the drain water is full in the drain water receiver 4, the drain pump 13 is stopped by the control device 14 by the detection of the drain sensor by the ultrasonic sensor 9 so that the drain water does not flow into the heat-resistant tube 12. .

  The drain water from the drain pump 13 of the drain pump 13 can be pumped from the drain water receiver 4. In this case, the drain water is drain water receiver 4 → heat-resistant tube 12 → drain water. Circulate with receiver 4.

It is a perspective view of a heat sink as what shows one embodiment of the machine room of the showcase of the present invention. It is a vertical side view of a heat sink as what shows one embodiment of the machine room of the showcase of the present invention. It is a block diagram which shows one Embodiment of the machine room of the showcase of this invention. It is a perspective view which shows an example of the machine room of a showcase.

1 Product storage 2 Condenser 3 Machine room 4 Drain water receiver,
DESCRIPTION OF SYMBOLS 5 Compressor 6 Evaporating plate 7 Electrical box 8 Full warning lamp 9 Ultrasonic sensor 10 Heat sink 11 Base plate 12 Heat-resistant tube 13 Drain pump 14 Control device

Claims (4)

  In the machine room formed in the lower part of the refrigeration system consisting of a condenser, a compressor, etc., the electrical equipment box, and the showcase body where the drain water receiver is installed, the metal between the heatsinks of the control equipment of the electrical equipment box A machine room of a showcase, characterized in that a heat-resistant tube made of synthetic resin or synthetic resin is arranged in a meandering manner, and a liquid as a refrigerant flows through the heat-resistant tube.   The showcase machine room according to claim 1, wherein the liquid is drain water, and is pumped up by a drain pump.   The machine room of the showcase according to claim 2, wherein drain water after passing through the meandering heat-resistant tube flows into a drain water receiver.   The machine room of the showcase according to claim 2, wherein the drain pump is driven and controlled by the output of the water level detection device of the drain water receiver.

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