JP5774868B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device used in a large cooling storage for storing fish, meat, and the like, and more particularly to a cooling device that improves defrost efficiency.

  FIG. 3 is a cross-sectional view showing an example of a conventional cooling device. In this cooling device, a cooling coil (evaporator) 103 and a fan 104 are accommodated in a cooling chamber 102 provided in the storage body 101, and by driving the fan 104, the internal air sucked from the suction port 105 is absorbed. Cool air is generated through the cooling coil 103 and blown out from the outlet 106 into the cabinet, and the driving and stopping of the fan 104 are alternately repeated based on the temperature inside the cabinet detected by a thermostat (not shown). Thus, the inside of the refrigerator is cooled to a substantially set temperature.

  On the other hand, in order to maintain the cooling capacity of the cooling coil 103, the cooling coil 103 is appropriately defrosted. Specifically, a plurality of heaters 107 disposed in the cooling coil 103 at intervals in the vertical direction are energized to generate heat and defrost, and the resulting defrost water drops on the drain pan 108 and drains. 109 is discharged to the outside.

  In the above defrost, until the thermostat reaches a preset defrost end temperature, for example, as shown in FIG. 4, all the heaters 107 are energized for about 25 minutes, and after the heaters 107 are stopped, water droplets attached to the cooling coil 103 The fan 104 is stopped after being delayed by about 3 minutes so that it does not fly into the cabinet.

JP 2003-148857 A

  In the above-described conventional cooling device, the heater 107 disposed inside the cooling coil 103 defrosts the entire cooling coil 103 and has a relatively large temperature error, so that the set temperature cannot be changed. Using a thermostat, all heaters 107 are energized until reaching a preset defrost end temperature. Therefore, the defrosting operation is finished with ice remaining in the cooling coil 103, or the ice in the cooling coil 103 is melted but the defrosting operation is not finished, and all the heaters 107 are energized. There was room for improvement in terms of defrost efficiency.

  The present invention has been made in view of the above problems in the conventional cooling device, and an object thereof is to improve the defrost efficiency of the cooling device.

In order to achieve the above object, the present invention is a cooling system that is installed in a cooling storage room, cools the internal air sucked from the suction port with at least one cooling coil, and blows out the generated cold air from the air outlet into the storage room. In the apparatus, the inside of one cooling coil is divided into a plurality of divided regions, a partition member having heat radiation, a heater disposed in each of the plurality of divided regions and defrosting the cooling coil, and the plurality a thermistor arranged in the respective divided regions, the plurality of divisional regions on the basis of the detection value before Symbol thermistor Te odor controlling the heater of the running defrost the each divided region, ends the defrost the temperature setting of the characterized in that it comprises a modifiable der Ru controller for each of the divided regions.

According to the present invention, the inside of one cooling coil is partitioned into a plurality of divided regions by a partition member, and the temperature of each divided region is detected by a thermistor, and then the heater is controlled to perform defrosting. Therefore, even if the temperature in one cooling coil varies, the variation can be easily dealt with, and the defrost efficiency can be improved as compared with the conventional case.
In addition, since the setting of the temperature at which defrosting is terminated can be changed for each of the divided areas by the control device, defrosting can be performed in consideration of the amount of frost formation for each divided area, and the local internal temperature While the rise can be prevented and the operation time of the heater can be minimized, the operation cost of the entire cooling device is reduced. Furthermore, since the setting of the defrost end temperature can be changed on the user side, an optimal set value can be selected in accordance with the operating condition of the cooling device.

  In addition, the presence of the heat radiating partition member prevents the heat generated by the heater from escaping to the outside of the partition member, thereby improving the defrost efficiency and adopting a heater at a lower temperature than the conventional one. In addition to the reduction, it is difficult for steam to be generated even when the defrost water contacts the heater. Therefore, the amount of frost formation in a store | warehouse | chamber can be reduced.

  Furthermore, in the temperature control, by using a thermistor instead of the conventional bimetal type thermostat, it is possible to change the set value of the defrost end temperature or perform fine temperature control with a small temperature error.

  In addition, the heating time by the heater can be set for each divided region by the control device, and optimum defrost control can be performed according to the situation of each divided region. Moreover, the control according to the driving | running state of the cooling device can be performed by changing the heating time by each heater by the user side.

  The partition member can be formed of a stainless steel plate having a mirror-finished surface, and the heat generated from the heater can be used more effectively in each divided region.

  As described above, according to the present invention, a cooling device with good defrost efficiency can be provided.

The cooling device which is one Embodiment of this invention is shown, (a) is front sectional drawing, (b) is side sectional drawing. It is a chart figure which shows heater energization time at the time of defrost of the cooling device of FIG. It is sectional drawing of the conventional cooling device. It is a chart figure which shows heater energization time at the time of defrost of the cooling device of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cooling device according to an embodiment of the present invention. The said cooling device is installed in the prefabricated storage etc. which refrigerate meat, fish, etc.

  As shown in FIG. 1B, the cooling device 1 includes a horizontally long casing 2 having a blowout port 2a on the front side (in the direction of the arrow X). Although one blower outlet 2a is drawn in the figure, the housing 2 includes a pair of blower outlets 2a in a direction perpendicular to the paper surface on which the figure is drawn. A horizontally long cooling coil (evaporator) 3 is disposed on the inner back side of the housing 2, and this cooling coil 3 is annularly connected to a compressor, a condenser, an expansion valve, etc. via a pipe (not shown). Connected to form a refrigeration cycle.

  The cooling coil 3 is provided with a plurality of refrigerant pipes 4 (indicated by white circles) arranged in a staggered pattern at intervals in the vertical direction and between the refrigerant pipes 4 at intervals in the vertical direction. A plurality of cord-shaped heaters 5 (shown by black circles), a plurality of heat dissipating fins (not shown) that are spaced apart in the lateral direction and connected to the refrigerant pipe 4, and a plurality of partition members 7; It has.

The partition member 7 is made of, for example, a stainless steel plate whose surface is mirror-finished. This is because the heat of the heater 5 is effectively used by utilizing thermal radiation. Further, as shown in FIG. 1 (a), by the partition member 7, the inside of the cooling coil 3 is divided into a plurality of divided regions R ₁ to R _6.

The thermistors 12 (indicated by hatched circles) are respectively disposed in the plurality of divided regions R _{1 to} R ₆ . As these thermistors 12, for example, an NTC (Negative Temperature Coefficient Thermistor) whose resistance decreases as the temperature rises can be used, but it is not limited to this.

  A drain pan 8 is installed below the cooling coil 3, and water generated during the defrost operation is dropped onto the drain pan 8 and discharged to the outside from the drain port 8 a. The thermistor 12 and the heater 5 are also arranged in the drain pan 8.

  As shown in FIG. 1B, a fan 9 is disposed on the inner front side of the housing 2 so as to face each outlet 2a. Further, a lattice-like cover 10 is attached to each of the air outlets 2 a on the outer front side of the housing 2.

  The control device (not shown) is electrically connected to the plurality of thermistors 12 and the heater 5, controls the energization to the heater 5 based on the temperature measured by the thermistor 12, and controls the energization time to the heater 5. It has a timer to do.

  When the fan 9 is driven, the outside air sucked into the housing 2 from the suction port (not shown) passes through the cooling coil 3 and is exhausted to the outside from the air outlet 2a of the housing 2. When the outside air passes through the cooling coil 3, it exchanges heat with the refrigerant pipe 4 and fins (not shown) to become cold air.

When the amount of frost on the cooling coil 3 increases, the cooling efficiency decreases, and thus the heater 5 is energized as appropriate to perform defrosting. At this time, the control device switches ON / OFF of the heater 5 based on the detection value of the thermistor 12 disposed in each of the divided regions R _{1 to} R ₆ . Accordingly, defrosting can be performed in accordance with the frost formation amount of the divided regions R ₁ to R _6.

The control device sets an upper limit temperature for each of the divided regions R _{1 to} R ₆ , and when it reaches this set temperature, it can turn off the heater 5 for each of the divided regions R _{1 to} R ₆ assuming that the defrost is completed. . The heater 5 in the drain pan 8 is turned off when the timer operation is started after the energization of the other heaters 5 is stopped, and when the set time or the temperature set by the thermistor 12 is detected.

With the above operation, as shown in FIG. 2, the energization time of the heater 5 changes for each divided region (R _1, R _{3 to} R _{5 in the} illustrated example), so that defrosting can be performed efficiently and indicated by a broken line. A time zone in which the heater 5 is not energized occurs, and the operating cost can be reduced. Moreover, since it can prevent the raise in internal temperature by performing defrost efficiently, it leads to the reduction of the operating cost of the whole cooling device.

Further, since the heat generated in each heater 5 does not escape upward from the partition member 7 positioned above, the defrost efficiency is improved as compared with the conventional case, and the surface temperature of the heater 5 can be lowered. Conventionally, a heater was selected with a watt density of 1.0 W / cm ² , and the heater surface temperature reached 300 ° C. or higher. However, in the present invention, the watt density can be set to about 0.1 to 0.2 W / cm ^2. The heater surface temperature is about 60 to 100 ° C.

  Conventionally, since the surface temperature of the heater was high, a large amount of heat unnecessary for the defrost was released into the cabinet, but in the present invention, the surface temperature of the heater 5 can be set to the minimum temperature necessary for the defrost. The power consumption is reduced and the heater 5 has a longer life.

  Further, by reducing the watt density, it is possible to increase the number of heaters 5 and spread the heat uniformly over the entire cooling coil 3, so that efficient defrosting is possible. Note that even if the number of heaters 5 increases, the power consumption of each heater 5 is small. Therefore, considering the running cost, the cost can be reduced compared to the conventional case.

  The heater 5 is formed by connecting a plurality of heaters in series (for example, in the case of a 200V heater, connecting three 67V heaters in series), the lead wire can be simplified, and the terminal block The time required for the connection work can be shortened.

  In the above embodiment, the number of divided areas is six. However, the divided areas can be changed as appropriate.

  In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

First cooling device 2 housing 3 cooling coils 4 refrigerant pipeline 5 heater 7 partition member 8 drain pan 9 fan 10 cover 12 thermistors _R 1 to R ₆ divided area

Claims (3)

In the cooling device that is installed in the cooling storage room, cools the internal air sucked from the suction port with at least one cooling coil, and blows out the generated cold air from the outlet to the inside.
Partitioning the inside of one cooling coil into a plurality of divided regions, and a partition member having heat radiation,
A heater disposed in each of the plurality of divided regions to defrost the cooling coil;
A thermistor disposed in each of the plurality of divided regions;
Changeable said plurality of divisional regions on the basis of the detection value before Symbol thermistor Te odor controlling the heater of the running defrost the each divided area, the setting of the temperature for ending the defrosting to the each divided area cooling device, characterized in that it comprises a der Ru controller. The cooling device according to claim 1, wherein the control device can set a heating time by the heater for each of the divided regions. The partition member has a surface cooling device according to claim 1 or 2, characterized in that a stainless steel plate that has been mirror-finished.

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