JP2006057948A - Cold insulating operation control device for cool container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold insulating operation control device for a cool container capable of safely and stably controlling two temperature zones by avoiding simultaneous drive of a compressor and a heater to avoid the generation of over-loading condition of a generator loaded on a refrigerating machine. <P>SOLUTION: Set temperature on a freezing chamber side is set lower than set temperature on a cooling chamber side, and the cold insulating operation control device is provided with a control unit 51 for controlling temperature on the cooling chamber side by leading the cold on the freezing chamber side into the cooling chamber side and driving an electric heater 23 on the cooling chamber side to maintain the temperature when temperature on the cooling chamber side excessively lowers. The control unit 51 controls to stop one of a compressor of the refrigerating machine and the electric heater 23 during the operation of the other thereof. In this case, order of priority is set to control any one of the compressor and the electric heater 23, and the control unit 51 controls the compressor or the electric heater 23 in this order of priority. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a cargo with different storage temperatures by controlling each chamber in a container partitioned into a first chamber and a second chamber by using engine-driven generator-mounted refrigerators with different set temperatures as targets. More specifically, the temperature of the second chamber is controlled by introducing the cool air of the refrigerator provided in the first chamber into the second chamber, and the second chamber The present invention relates to a cold insulation operation control device provided with a control means for performing control so that the temperature is maintained by a heater provided in a second chamber when the temperature of the chamber is excessively lowered.

    Recent cool containers are divided into two front and rear chambers with movable insulating partition plates inside the container cabinet, and the front and rear chambers are controlled with different set temperatures as targets, so that cargo with different storage temperatures can be mixed. The transportation efficiency is improved as possible (for example, see Patent Document 1).

  For example, the front chamber is used as a freezer for storing frozen storage items that must be transported while maintaining frozen state such as frozen meat and frozen seafood, and the rear chamber is refrigerated for fresh vegetables and soft drinks. Used as a refrigerator for storing refrigerated storage items that must be maintained and transported.

In this case, the cool container performs a cold insulation operation by an engine-driven generator-mounted refrigerator. Specifically, for example, the set temperature of the freezer in the front chamber is set lower than the set temperature of the refrigerator in the rear chamber, and the temperature control of the refrigerator is performed by introducing the cold air of the freezer into the refrigerator. . Further, when the temperature of the refrigerator is excessively lowered, control is performed so as to maintain the temperature in the refrigerator by a heater provided on the refrigerator side.
JP 2004-122891 A

  By the way, in such an engine-driven generator-mounted refrigerator, the size of the refrigerator is designed to be cooled to about −20 ° C. to −30 ° C. when mounted on a container or truck. . In this case, as described above, when controlling the two rooms of the freezer and the refrigerator at different set temperatures, that is, so-called two temperature zones, the compressor and the heater on the refrigerator side need to be operated simultaneously. However, in the refrigerator of the above design, when the compressor and the heater are operated at the same time, the generator (engine) is overloaded, which causes a problem in terms of safety.

  In order to solve this problem, it is sufficient to install a generator (engine) with a capacity that is equal to the capacity of the compressor plus the capacity of the heater drive, but doing so increases the size of the generator, resulting in weight, cost, and fuel efficiency. There was a problem of being disadvantageous.

  The present invention was devised to solve such problems, and its purpose is to avoid the simultaneous operation of the compressor and the heater, thereby avoiding the occurrence of an engine overload condition even with the capacity of the refrigerator designed as described above. An object of the present invention is to provide a cool container cold insulation control device capable of safely and stably controlling two temperature zones.

  In order to solve the above-mentioned problems, a compressor cooling operation control device according to the present invention has different chambers in a container partitioned into a first chamber and a second chamber by an engine-driven generator-mounted refrigerator. A cool container that can load cargoes having different storage temperatures by controlling the set temperature as a target, and the second air is introduced into the second chamber by introducing cold air from the refrigerator provided in the first chamber. In the cold insulation operation control apparatus provided with the control means for controlling the temperature of the chamber and controlling the temperature so as to be maintained by the heater provided in the second chamber when the temperature of the second chamber is excessively lowered. The control means controls to stop the other operation while operating either the compressor or the heater of the refrigerator. In this case, a priority for controlling either the compressor or the heater is set, and the control means controls either the compressor or the heater according to the priority.

  According to the present invention having such a feature, an engine overload state can be avoided by stopping the other operation while one of the compressor and the heater of the refrigerator is being operated. In the operation at this time, since the cold insulation operation control is performed according to the preset priority, it is possible to stably control both the first chamber and the second chamber according to the priority.

  Here, the first chamber is a freezer, the second chamber is a refrigerator, and the freezing side temperature deviation which is the difference in the internal temperature with respect to the set temperature on the freezer side is ΔT1, and the difference in the internal temperature with respect to the set temperature of the refrigerator Assuming that the temperature deviation on the refrigeration side is ΔT2, the following four patterns can be considered as priorities.

  Priority 1: The control means gives priority to temperature control of the freezer by controlling the compressor when 1 ° C. <ΔT1.

  Priority 2: The control means gives priority to temperature control of the refrigerator by operating the heater when ΔT2 <−2 ° C. and ΔT1 <0.5 ° C.

  Priority 3: When the control means is −2 ° C. <ΔT2 <0 ° C. and ΔT1 <0 ° C., the heater is operated to give priority to temperature control of the refrigerator.

  Priority 4: The control means gives priority to temperature control of the refrigerator by operating the heater when ΔT1 <−0.5 ° C. when 0 ° C. <ΔT2 <0.5 ° C.

  That is, the priority is basically set so that the compressor or the heater is operated with priority given to the one that deviates from the set temperature. First, the freezer is prioritized, and then the heater of the refrigerator is set to operate while watching the temperature on the freezer side by the compressor.

  By setting the priority in this way, the temperature control accuracy on the freezer side is ± 1 ° C., and the temperature control accuracy on the refrigerator side is stably controlled in the range of ± 2 ° C. Is possible.

  According to the cool container cooling operation control apparatus according to the present invention, the engine overload state can be avoided by stopping the other operation while operating either the compressor or the heater of the refrigerator. As a result, the capacity of the generator can be minimized and can be optimized in terms of weight, cost, and fuel consumption. In the operation at this time, since the cold insulation operation control is performed according to the preset priority, both the first chamber and the second chamber can be stably controlled according to the priority.

  Embodiments of the present invention will be described below with reference to the drawings.

-Explanation of cool container structure-
FIG. 1 is a schematic longitudinal sectional view showing a container structure of a cool container according to the present embodiment, and FIG. 2 is a transverse sectional view of a ventilation duct portion when the cool container is viewed from above. In addition, the arrow in a figure has shown the flow direction of cold air.

  That is, the cool container of this embodiment is divided into the front chamber 12 and the rear chamber 13 by the heat insulation partition plate 11 which can move the container inside back and forth. Further, the ceiling inside the container has a double structure of a container outer wall (top wall) 14 and a container inner wall 15, and a space between the container outer wall 14 and the container inner wall 15 is a ventilation duct 16. .

  As shown in FIG. 2, the ventilation duct 16 is divided into left and right parts along the longitudinal direction of the container body, and the ventilation duct 161 on one side (upper side in FIG. 2) is arranged from the front chamber 12 side to the rear chamber. A forward-side ventilation duct for sending cold air toward the side 13 and a ventilation duct 162 on the other side (lower side in FIG. 2) are a return-side ventilation duct for returning the cold air from the rear chamber 13 toward the front chamber 12. It has become.

  The forward-side shutter member 311 and the backward-side shutter unit 312 are respectively provided at the end of the forward-side air duct 161 and the backward-side air duct 162 on the front chamber 12 side, and the forward-side shutter member 311 and the backward-side shutter are provided. By opening and closing the portion 312 (which will be described later with reference to FIG. 3), the forward-side ventilation duct 161 and the return-side ventilation duct 162 communicate with the inside of the front chamber 12.

  In addition, the front upper portion of the front chamber 12 is provided with a refrigerator housing portion 17a for housing the refrigerator 20, and a circulation fan housing portion 17b for housing the three circulation fans 18, 18, 18. Yes. Further, the electric heater 10 is provided in the vicinity of the fan 20a of the refrigerator 20 in the refrigerator storage portion 17a. The electric heater 10 is basically a defrost heater for removing frost and the like adhering to the heat exchanger.

  Further, a bulkhead 19 is provided on the front wall of the front chamber 12 for allowing the cool air from the refrigerator 20 to flow downward, and the upper portion of the bulkhead 19 is the refrigerator storage portion 17a and the circulation fan storage portion 17b. The lower part of the bulkhead 19 is opened inside the front chamber 12. That is, the front chamber 12 has a lower blowing structure that blows out cold air from below.

  On the other hand, in the upper rear side of the rear chamber 13, a cool air introduction fan storage portion 22 that houses one cold air introduction fan 21 for sucking in cool air from the front chamber 12, and cold air is circulated in the rear chamber 13. The circulation fan storage unit 24 that stores the three circulation fans 23, 23, and 23 is provided in communication. In addition, the cool air introduction fan storage portion 22 and the rear end portion of the outward path side air duct 161 are provided so as to be opened and closed by the outward path shutter member 311. On the other hand, the rear end portion of the return-side air duct 162 is open to both the interior of the rear chamber 13 and the circulation fan storage portion 24, and can be opened and closed by the return-side shutter portion 312.

  Further, a bulkhead 26 is provided on the inner wall of the door 25 that constitutes the rear wall of the rear chamber 13, and the upper part of the bulkhead 26 is provided with a cool air introduction fan storage unit 22 and a circulation fan. An opening is formed in the storage portion 24, and a lower portion of the bulkhead 26 is opened inside the rear chamber 13. That is, the rear chamber 13 has a lower blowing structure that blows out cool air from below, like the front chamber 12. In addition, the circulation fan storage unit 24 is provided with an electric heater 27 so as to face the circulation fans 23, 23, and 23.

  That is, in the cool container of the present embodiment, the front chamber 12 has the rotation of the fan 20 a of the refrigerator 20 and the circulation fans 18, 18, 18 in a state where the forward shutter member 311 and the backward shutter unit 312 are closed. Due to the rotation, the cool air is circulated by the lower blowing, and the rear chamber 13 circulates the cold air by the lower blowing by the rotation of the circulation fans 23, 23 and 23. On the other hand, when the forward side shutter member 311 and the backward side shutter unit 312 are opened by the rotation of the cool air introduction fan 21, the cold air blown out from the refrigerator 20 is transferred to the bulkhead 19 as indicated by arrows in FIGS. 1 and 2. After passing through the front chamber 12 and circulated through the front chamber 12, it is sent from the front chamber 12 side to the rear chamber 13 side through the upper outgoing air duct 161 (indicated by broken arrows in FIG. 1). ), Passes through the cool air introduction fan storage portion 22 on the rear chamber 13 side, passes through the circulation fan storage portion 24, passes through the bulkhead 26, and blows out from the lower side of the rear chamber 13 to circulate in the rear chamber 13. . The circulated cold air is drawn into the circulation fan housing 24 so as to be sucked into the circulation fans 23, 23, 23, and blown out from the lower side of the rear chamber 13 through the bulkhead 26 again. At this time, a part of the cool air in the rear chamber 13, which has become slightly high pressure due to being sucked in from the front chamber 12, is drawn into the circulation fan storage portion 24 and again passes through the return-side air duct 162 to the front chamber 12 side. (Indicated by a solid arrow in FIG. 1).

  FIG. 3 shows an open / close structure of the forward-side shutter member 311 and the backward-path shutter member 312. The forward-side shutter member 311 and the backward-side shutter member 312 have the same structure except that the arrangement direction is reversed left and right, and therefore, the backward-side shutter member 312 will be described as an example here.

  The return-path-side shutter member 312 is disposed in the same direction (the direction shown in FIG. 3) at both ends of the outward-path-side ventilation duct 162. That is, the upper end 34a and the lower end 34b of the shutter mounting plate 34 having the opening 33 through which the cold air passes are respectively fixed to the container outer wall (top wall) 14 and the container inner wall 15 by fixtures (bolts and nuts in the figure) 35. The return side shutter member 312 is attached to the shutter attachment plate 34 so as to close the opening 33. The return-side shutter member 312 has an upper end that is rotatably attached to the support shaft 36. Further, the shutter mounting plate 34 is provided to be inclined by an angle θ (for example, 15 degrees) with respect to the vertical direction. Since the shutter mounting plate 34 is provided in an inclined manner in this way, the return-path-side shutter member 312 acts so as to always close the opening 33 by its own weight. When cool air flows in the direction indicated by the white arrow in FIG. 3 in the forward-side air duct 162, the return-side shutter member 312 is indicated by a two-dot chain line in FIG. It rotates to open the opening 33. When the flow of cool air disappears, the return-path shutter member 312 rotates by its own weight, and the opening 33 is closed again.

  In addition, when the cool container shown in FIG. 2 is seen from the arrow A direction in the drawing, the forward shutter member 311 has the arrangement relationship shown in FIG.

  The material of the return-side shutter member 312 and the outward-side shutter member 311 having such a configuration is preferably a relatively light material that can be easily rotated by the flow of cold air, such as polyethylene (PE) or polypropylene ( It is preferable to use a resin plate formed of a resin such as PP).

-Explanation of cold storage operation control according to the present invention-
As described above, the cool container according to the present embodiment controls the respective chambers of the front chamber 12 and the rear chamber 13 with different set temperatures as targets (two temperature zone control), so that cargoes having different storage temperatures are mixedly loaded. Is possible. In the present embodiment, the front chamber 12 is a freezer that stores frozen storage articles that must be transported while maintaining a frozen state such as frozen meat and frozen seafood, and the rear chamber 13 is a refrigerated state such as fresh vegetables and soft drinks. It is used as a refrigerator for storing refrigerated storage articles that must be transported while maintaining

  In addition, the set temperature of the front chamber (hereinafter referred to as “freezer”) 12 is set lower than the set temperature of the rear chamber (hereinafter referred to as “refrigerator”) 13, and as described above, The temperature of the refrigerator 13 is controlled by introducing it to the refrigerator 13 side through the forward-side air duct 161, and the temperature is controlled by the electric heater 27 when the temperature of the refrigerator 13 is excessively lowered.

  Here, the case where the temperature of the refrigerator 13 falls too much can be considered as follows. That is, the internal temperature of the freezer 12 is controlled to about −20 ° C. to −30 ° C., and the internal temperature of the refrigerator (chilled) 13 is controlled to around + 5 ° C. Therefore, due to this temperature difference, cold air on the freezer 12 side is controlled. Even if the refrigerant is not supplied to the refrigerator 13 side through the forward-side air duct 161, the cold heat on the freezer 12 side is transmitted to the refrigerator 13 side through the heat insulating partition plate 11, and the inside of the refrigerator 13 is cooled so that the set temperature is May fall too much. For example, when an article is transported from Osaka to Hokkaido in winter, the inside of the refrigerator 13 may be cooled by the outside air temperature in Hokkaido and may be too low from the set temperature. In such a case, it is necessary to control so that the interior of the cabinet is warmed by the electric heater 27 and the interior is maintained at a set temperature (+ 5 ° C. or the like). In addition, there may be a case where it is necessary to control the interior of the refrigerator with the electric heater 10 to maintain the interior at the set temperature (−20 ° C. to −30 ° C.) on the freezer 12 side.

  Thus, in the control of the two temperature zones, it may be necessary to operate the compressor of the refrigerator 20 and mainly the electric heater 27 of the refrigerator 13 at the same time. However, as described above, when the compressor of the refrigerator 20 and the electric heater 27 of the refrigerator 13 are operated simultaneously, a problem occurs that the generator is overloaded. Therefore, in the present embodiment, the control unit is configured to stop the other operation while one of the compressor of the refrigerator or the electric heater 27 is in operation. In this case, priority is given in advance to control either the compressor or the electric heater 27, and either the compressor or the electric heater 27 is controlled according to this priority.

  FIG. 4 is a functional block diagram showing a schematic configuration of a control system that controls two temperature zones in the cool container having the above configuration.

  That is, a plurality of temperature sensors 52 (not shown in FIGS. 1 to 3) provided at appropriate portions of the freezer 12 and the refrigerator 13 are provided in the control unit 51 that controls the entire two temperature zones. It is connected. The control unit 51 is connected to a heater drive unit 53 that drives the electric heaters 10 and 27 to ON / OFF, and a fan drive unit 54 that controls ON / OFF of the cool air introduction fan 21 and the circulation fans 18 and 23. It is connected to the. Further, the control unit 51 drives and controls the compressor of the refrigerator 20. Although not shown, the control unit 51 is a CPU that performs various arithmetic processes, a ROM that stores a temperature control program for two temperature zones, a variety of detected temperature data, and functions as a work area during temperature control. RAM etc. are provided.

  Hereinafter, specific examples of normal cold storage operation control on the freezer side and normal cold storage operation control on the refrigerator side will be described, and finally, the cold storage operation control based on the priority according to the present invention will be described.

<Normal cold storage control on the freezer side>
FIG. 5 is a flowchart showing a process of normal cold storage operation control on the freezer side. Hereinafter, the cold insulation operation control process will be described with reference to the flowchart shown in FIG. Here, the set temperature of the freezer 12 is, for example, −25 ° C., and the accuracy of the internal temperature control of the freezer 12 is + 1 ° C. to −2 ° C. Further, a freezing side temperature deviation which is a difference of the internal temperature with respect to the set temperature of the freezer 12 is set to ΔT1. It is assumed that the circulation fan 18 is always in operation.

  The control unit 51 detects the internal temperature by a temperature sensor 52 provided at a predetermined location (not shown) of the freezer compartment 12, and the freezing side temperature deviation ΔT1 which is the difference between the detected temperature and the set temperature of the freezer 12 is It is determined whether or not the control accuracy exceeds + 1 ° C. (step S11). As a result, when ΔT1 exceeds + 1 ° C. (when it is determined Yes in step S11), the compressor is turned on and the operation is started (step S12). On the other hand, after starting the operation of the compressor, it is determined whether or not ΔT1 has become −1 ° C. or less (step S13). As a result, when ΔT1 is equal to or lower than −1 ° C. (when it is determined Yes in step S13), the compressor is turned off (step S14).

  The controller 51 basically repeats the above processing (the processing of Steps S11 to S14) so that the internal temperature of the freezer 12 is within the range of -25 ° C to ± 1 ° C, which is the set temperature. Control.

  On the other hand, in such ON / OFF control of the compressor, the control unit 51 always monitors whether ΔT1 is −2 ° C. or lower (step S15). As described above, this takes into consideration other factors that cannot be controlled only by turning the compressor ON / OFF (for example, the influence of the above-described outside temperature, etc.).

  When ΔT1 becomes −2 ° C. or lower (when it is determined Yes in step S15), it is determined that the inside of the freezer 12 is too cold, and the electric heater 10 is turned on (step S16). When the internal temperature reaches the set temperature, that is, when ΔT1 becomes 0 (Yes in Step S17), the electric heater 10 is turned off (Step S18), and the process returns to Step S11.

<Description of normal cold operation control on the refrigerator side>
FIG. 6 is a flowchart showing the process of the normal cold insulation operation control on the refrigerator side. Hereinafter, the cold insulation operation control process will be described with reference to the flowchart shown in FIG. Here, the set temperature of the refrigerator 13 is, for example, + 5 ° C., and the accuracy of the internal temperature control of the refrigerator 13 is ± 2 ° C. Moreover, let the refrigeration side temperature deviation which is the difference of the internal temperature with respect to the preset temperature of the refrigerator 13 be (DELTA) T2. Further, it is assumed that the circulation fan 23 is always operating.

  The control unit 51 detects the internal temperature by a temperature sensor 52 provided at a predetermined location (not shown) of the refrigerating chamber 13, and the refrigerating side temperature deviation ΔT2 that is the difference between the detected temperature and the set temperature of the refrigerator 13 is It is determined whether or not the control accuracy exceeds + 1 ° C. (step S21). As a result, when ΔT2 exceeds + 1 ° C. (when it is determined Yes in step S21), the cool air introduction fan 21 is turned on and the operation is started (step S22). On the other hand, after the operation of the cool air introduction fan 21 is started, it is determined whether or not ΔT2 becomes −0.5 ° C. or less (step S23). As a result, when ΔT2 becomes −0.5 ° C. or less (when it is determined Yes in step S23), the cool air introduction fan 21 is turned off (step S24).

  The control unit 51 basically repeats the above processing (the processing of Steps S21 to S24), so that the internal temperature of the refrigerator 13 is within the range of the set temperature from + 5 ° C to + 1 ° C to -0.5 ° C. Control to be

  On the other hand, in such ON / OFF control of the cool air introduction fan 21, the control unit 51 always monitors whether or not ΔT2 has become −1 ° C. or less (step S25). As described above, this is because other elements that cannot be controlled only by turning on / off the cool air introduction fan 21 (for example, the effect of cold heat conducted from the freezer 12 to the heat insulating partition plate 11 or the outside air temperature). We are considering.

  When ΔT2 becomes −1 ° C. or lower (when it is determined Yes in step S25), it is determined that the inside of the refrigerator 13 is too cold, and the electric heater 27 is turned on (step S26). When ΔT2 exceeds 0.5 ° C. (Yes in Step S27), the electric heater 27 is turned off (Step S28), and the process returns to Step S21.

<Explanation of cooling operation control by priority>
In the present embodiment, basically, the normal cold storage operation control on the freezer side and the normal cold storage operation control on the refrigerator side are individually performed, and in this case, the operation of the compressor and the electric heater 27 overlaps. When this occurs, the cooling operation control based on the priority described below is performed with priority over each of the above-described cooling operation controls.

  FIG. 7 is a flowchart showing the process of the cold insulation operation control based on the priority. Hereinafter, the cooling operation control process based on the priority will be described with reference to the flowchart shown in FIG.

  In the cold insulation operation control process based on the priority, first, the control unit 51 preferentially determines whether or not ΔT1 that is the refrigeration side temperature deviation exceeds + 1 ° C. (step S31). As a result, when ΔT1 exceeds + 1 ° C. (when it is determined Yes in step S31), priority is given to the cold storage operation control of the freezer 12 (step S38). That is, priority is given to the processing shown in FIG. That is, even when the electric heater 27 is turned on on the refrigerator 13 side, the electric heater is not turned on, and the control on the freezer 12 side is prioritized.

  On the other hand, when ΔT1 is + 1 ° C. or lower (when it is determined No in step S31), it is next determined whether or not ΔT2 that is the refrigeration side temperature deviation is −2 ° C. or lower (step S32). ). As a result, when ΔT2 is −2 ° C. or lower (when it is determined Yes in step S32), it is next determined whether ΔT1 is + 0.5 ° C. or lower (step S33). When ΔT1 exceeds + 0.5 ° C. (when it is determined No in step S33), the process proceeds to step S38, and the cool operation control of the freezer 12 is prioritized. That is, even if the refrigerator 13 side is somewhat too cold, the electric heater 27 is not turned on and the control on the freezer 12 side is given priority.

  On the other hand, when ΔT1 is + 0.5 ° C. or lower (when determined Yes in step S33), the process proceeds to step S39, and priority is given to the processing of steps S26 and S27 of FIG. And do it. That is, when the compressor is in operation, the compressor is turned off, and the processes in steps S26 and S27 are prioritized. Then, the determination at Step S27 is Yes and it is always monitored whether or not the electric heater 27 is turned off at Step S28 (Step S40), and whether or not ΔT1 exceeds + 1 ° C. is always monitored (Step S41). ) When the electric heater is not turned off and ΔT1 does not exceed + 1 ° C. (No in Step S40, No is determined in Step S41), the process returns to Step S39, and Steps S26 and Step shown in FIG. The process of S27 is repeated. On the other hand, when the electric heater is turned off or ΔT1 exceeds + 1 ° C. (Yes in Step S40 or Yes in Step S41), the process proceeds to Step S38, and the cold storage control of the freezer 12 is controlled. Priority.

  On the other hand, if ΔT2 is not −2 ° C. or lower in step S32 (if No is determined in step S32), then it is determined whether ΔT2 is within the range of −2 ° C. to 0 ° C. (Step S34). As a result, when ΔT2 is in the range of −2 ° C. to 0 ° C. (when it is determined Yes in step S34), it is next determined whether ΔT1 is 0 ° C. or less (step S35). ). As a result, when ΔT1 is not 0 ° C. or lower (when it is determined No in step S35), the process proceeds to step S38, and the cold storage operation control of the freezer 12 is prioritized. On the other hand, when ΔT1 is 0 ° C. or less (when determined Yes in step S35), the process proceeds to step S39, and the processes in steps S26 and S27 of FIG. Do. That is, when the compressor is in operation, the compressor is turned off, and the processes in steps S26 and S27 are prioritized. If the electric heater is not turned off and ΔT1 does not exceed + 1 ° C. (No in Step S40, No is determined in Step S41), the process returns to Step S39, and Steps S26 and Step shown in FIG. The process of S27 is repeated. On the other hand, when the electric heater is turned off or ΔT1 exceeds + 1 ° C. (Yes in Step S40 or Yes in Step S41), the process proceeds to Step S38, and the cold storage control of the freezer 12 is controlled. Priority.

  On the other hand, if ΔT2 is not in the range of −2 ° C. to 0 ° C. in Step S34 (when No is determined in Step S34), then ΔT2 is in the range of 0 ° C. to + 0.5 ° C. Is determined (step S36). As a result, when ΔT2 is within the range of 0 ° C. to + 0.5 ° C. (when it is determined Yes in step S36), it is next determined whether ΔT1 is −0.5 ° C. or less. to decide. As a result, when ΔT1 is not −0.5 ° C. or less (when it is determined No in step S37), the process proceeds to step S38, and the cold storage operation control of the freezer 12 is prioritized. On the other hand, when ΔT1 is −0.5 ° C. or less (when determined to be Yes at step S37), the process proceeds to step S39, and the processing of steps S26 and S27 of FIG. Give priority. That is, when the compressor is in operation, the compressor is turned off, and the processes in steps S26 and S27 are prioritized. If the electric heater is not turned off and ΔT1 does not exceed + 1 ° C. (No in Step S40, No is determined in Step S41), the process returns to Step S39, and Steps S26 and Step shown in FIG. The process of S27 is repeated. On the other hand, when the electric heater is turned off or ΔT1 exceeds + 1 ° C. (Yes in Step S40 or Yes in Step S41), the process proceeds to Step S38, and the cold storage control of the freezer 12 is controlled. Priority.

  On the other hand, if ΔT2 is not within the range of 0 ° C. to + 0.5 ° C. in Step S36 (if determined No in Step S36), the process returns to Step S31.

It is a schematic longitudinal cross-sectional view which shows the container structure of the cool container of this invention. It is the cross-sectional view of the ventilation duct part which looked at the cool container of this invention from upper direction. It is sectional drawing which shows the structure of an outward path side shutter member and a backward path side shutter member. It is a functional block diagram of the control system which controls 2 temperature zones in the cool container of the present invention. It is a flowchart which shows the process of the normal cold storage operation control by the freezer side. It is a flowchart which shows the process of the normal cold storage operation control by the side of a refrigerator. It is a flowchart which shows the process of the cold storage operation control by a priority.

Explanation of symbols

11 Insulation partition 12 Front room (freezer)
13 Rear room (refrigerator)
14 Container outer wall (top wall)
DESCRIPTION OF SYMBOLS 15 Container inner wall 16 Ventilation duct 161 Outward side ventilation duct 162 Return path side ventilation duct 17a Refrigeration machine accommodating part 17b Circulating fan accommodating part 18 Circulating fan 19 Bulkhead 20 Refrigerator 21 Cold air introducing fan 22 Cold air introducing fan accommodating part 23 Circulating fan 24 Circulation Fan housing section 26 Bulk head 311 Outward shutter member 312 Return shutter member 33 Opening 34 Shutter mounting plate 36 Support shaft 51 Control section 52 Temperature sensor 53 Electric heater drive section 54 Fan drive section

Claims (6)

Cargoes with different storage temperatures can be mixed by controlling the chambers in the container partitioned into the first chamber and the second chamber with different target temperatures by the engine-driven generator-mounted refrigerator. When the temperature of the second chamber is controlled by introducing cool air from the refrigerator provided in the first chamber into the second chamber and the temperature of the second chamber is too low Is a cold insulation operation control apparatus provided with a control means for performing control so as to maintain the temperature by a heater provided in the second chamber,
The said control means is controlled to stop the other driving | operation, while operating either the compressor of the said refrigerator, or the said heater, The cool-cold operation control apparatus of the cool container characterized by the above-mentioned.   The priority for controlling either the compressor or the heater with priority is set, and the control means controls either the compressor or the heater according to the priority. Cool container cold storage control device. The first chamber is a freezer, the second chamber is a refrigerator, and the freezing side temperature deviation, which is the difference in the internal temperature with respect to the set temperature on the freezer side, is ΔT1, and the freezing is the difference in the internal temperature with respect to the set temperature of the refrigerator When the side temperature deviation is ΔT2,
3. The cool container cool-in operation control apparatus according to claim 2, wherein the control unit gives priority to temperature control of the freezer by controlling the compressor when 1 ° C. <ΔT <b> 1. 4.   The said control means, when (DELTA) T2 <-2 degreeC, and (DELTA) T1 <0.5 degreeC operate | move the said heater and give priority to the temperature control of a refrigerator. Cool container cooler operation control device.   4. The control device according to claim 3 or 2, wherein, when -2 [deg.] C <[Delta] T2 <0 [deg.] C and [Delta] T1 <0 [deg.] C, priority is given to temperature control of the refrigerator by operating the heater. Item 5. A cool container cooling operation control device according to Item 4. The control means prioritizes refrigerator temperature control by operating the heater when 0 ° C <ΔT2 <0.5 ° C and ΔT1 <-0.5 ° C. The cool container cooling operation control device according to any one of claims 3 to 5.

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