JP2005328859A - Temperature management device of cold/hot storage food delivery vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically switch a temperature management device to a hot storage mode or a cold storage mode without requiring a complex sensing circuit or sophisticated connection work when a cooling/heating device is switched from a hot storage mode to a cold storage mode or from a hot storage mode to a cold storage mode. <P>SOLUTION: Temperature sensors 12 and 13 sense the internal temperature of the cold/hot storage food delivery vehicle designed to perform cold storage and hot storage in the interior by switching the cooling/heating device between a cold storage mode and a hot storage mode. When an abnormal temperature occurs during the cold storage mode or the hot storage mode, the temperature management device 14 emits an abnormal temperature warning signal. At that time, it is judged whether the delivery vehicle is in the cold storage mode or the hot storage mode on the basis of a percentage change in the internal temperature and changes a set temperature for giving an abnormal temperature warning signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

   The present invention relates to a cooling / heating storage car that is delivered in a hospital, a central kitchen or the like while cooling and delivering the meal, and the meal is heated and served immediately before. The present invention relates to a temperature management device for a warm storage car.

   In hospitals, central kitchens, etc., cooked meals are put in dishes, stored in trays with trays placed on trays, delivered and stored while cooling, and some meals before meals. There are places where some meals are heated and served while keeping cool. In such a case, some of the distribution vehicles have built-in cooling / heating devices, but some of the distribution vehicles do not have a built-in cooling / heating device, and some types supply cold / hot air from the outside. .

   In any case, when performing cooling and heating, control is performed so that the inside of the cart is within a predetermined temperature range while detecting the temperature. However, simply controlling the temperature based on the internal temperature does not allow sufficient cooling during refrigeration due to a failure, etc., or even during refrigeration, it is exposed to a temperature range where food poisoning bacteria are prone to proliferate for a long period of time. It can happen. Therefore, a temperature management device is added so that an alarm is issued to notify the occurrence of an abnormality when the temperature inside the refrigerator becomes abnormal during refrigeration or warming.

The following documents are related to such cold / hot storage vehicles.
Japanese Patent No. 2644187 (A47B 31/02)

   However, in such a temperature management device for a cold / hot storage distribution vehicle, when the cooling / heating device of the distribution vehicle is switched from the refrigeration mode to the storage mode, the storage mode is normal. If the temperature management device remains in the refrigeration mode, it is determined that the temperature has become abnormal and an alarm is issued. Therefore, when the cooling / heating device is switched from the refrigeration mode to the refrigeration mode, the temperature management device also needs to be switched to the refrigeration mode. In particular, in the case of breakfast, there is a problem that the switching time is early in the morning and the burden on the worker increases.

   In order to avoid this, it is conceivable to automatically switch the mode of the temperature control device at the same time as the mode switching of the cooling / heating device. To automate the mode switching, the mode of the cooling / heating device is switched. It is necessary to automatically detect this, or to switch the mode of the temperature management device using the mode switching signal of the cooling / heating device. However, in order to automatically detect that the mode of the cooling / heating device has been switched, there is a problem that a complicated detection circuit is required. In order to switch the mode of the temperature management device using the mode switching signal of the cooling / heating device, it is necessary to draw out a signal line from at least a part of the control circuit of the cooling / heating device and connect it to the temperature management device There is a problem that advanced work is required.

   In view of such problems, the present invention eliminates the burden on the worker, does not require complicated detection circuits, and does not require advanced connection work, and the cooling / heating device is changed from the refrigeration mode to the refrigeration mode, or from the refrigeration mode. The purpose is to enable the temperature management device to automatically switch to the refrigeration mode or the refrigeration mode when switching to the refrigeration mode.

   In order to solve the above-mentioned problem, the temperature management device for a cold / hot storage allocation vehicle according to claim 1 switches the cooling / heating device between the refrigeration mode and the refrigeration mode, so A cold sensor that detects the temperature inside the cold and warm storage car that can be stored by a temperature sensor and issues an abnormal temperature warning signal when an abnormal temperature occurs in each of the refrigerated mode and the warmed mode.・ Temperature management device for both warm storage vehicles, characterized in that it determines whether it is refrigerated or warmed based on the rate of change in the internal temperature, and switches the set temperature for issuing an abnormal temperature alarm signal .

   The temperature management device for a cold / hot storage distribution vehicle according to claim 2 is characterized in that an alarm signal is issued on condition that the abnormal temperature state has continued for a certain period of time or longer.

   The temperature management device for a cold / hot storage distribution vehicle according to claim 3 is characterized in that the temperature sensor is provided in the vicinity of a cold / hot air outlet from the inside to the cooling / heating device. .

   The temperature management device for a cold / hot storage distribution vehicle of the present invention has the following effects.

   In other words, the temperature management device for a cold / hot storage distribution vehicle according to claim 1 determines whether the temperature is refrigerated or warmed based on the rate of change of the internal temperature, and sets the temperature for issuing an abnormal temperature alarm signal. Therefore, it is possible to determine whether the temperature is being refrigerated or warmed by simply modifying the processing program of the temperature management device. As a result, no complicated detection circuit or sophisticated connection work is required, and when the cooling / heating device is switched from the refrigeration mode to the refrigeration mode or from the refrigeration mode to the refrigeration mode, the temperature management device automatically refrigerates. It becomes possible to switch to the mode or the refrigeration mode.

   Further, the temperature management device for the cold / hot storage distribution vehicle according to claim 2 is configured to issue an alarm signal on condition that the abnormal temperature state has continued for a certain period of time or longer. Even if a temporary abnormal temperature occurs due to a special factor, it can be excluded and an alarm signal can be issued.

   Further, in the temperature management device for a cold / hot storage distribution vehicle according to claim 3, the temperature sensor is provided in the vicinity of the cold / hot air discharge port from the inside to the cooling / heating device. Without any modification, it is possible to make a detection that strongly reflects the temperature inside the car.

   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

   FIG. 1 is a view showing a state in which a distribution vehicle is set in a cooling / heating unit. In FIG. 1, 1 is a cooling / heating unit, and 3 is a trolley. The cooling / heating unit 1 includes a cooling unit, a heater, and a fan inside, and can set a layout vehicle 3 to supply cold wind and warm air to the layout vehicle 3. As shown in FIG. 2, the allocation vehicle 3 has a heat insulating wall around it, and has a storage room that is opened and closed by an opening / closing door 9, and has a plurality of compartments 8 therein. Among them, a tray 10 on which a cooked meal is placed in tableware is stored. In addition, cold / hot air intakes 4, 6 and cold / hot air discharge ports 5, 7 are provided vertically on the rear surface of the allocation vehicle 3 so as to communicate with all the compartments 8.

   As shown in the horizontal sectional view of FIG. 3, the interior of each compartment 8 is divided into left and right parts by a heat insulating partition plate 11 so that the left and right parts can be separately cooled and heated. The lower part of the partition plate 11 has a gap that allows the tray 10 to pass therethrough so that the tray 10 on which food is placed can be taken in and out. Here, on the tray 10 on the cold / hot air intake 6 side of the partition plate 11, a meal to be cooked such as rice, soup and meat is arranged. , Salads, cold meals, etc.

   Such a distribution vehicle 3 is a state in which a tray on which food is placed is stored in each compartment 8, and the cold / hot air intakes 4 and 6 on the back and the cold / hot air are taken until meal time. The wind discharge ports 5 and 7 are connected to the connection port 2 of the cooling / heating unit 1 and coupled to the cooling / heating unit 1. At first, cool air is supplied from the cooling / heating unit 1 to the cold / hot air intakes 4, 6 to cool the entire compartment 8 of the distribution vehicle 3, and the hot meals stored inside are kept cold. Maintain the hygiene of eating meals. Thereafter, when the predetermined time comes, the cold air is continuously sent from the cold / hot air intake 4, but the cold / hot air intake 6 is switched by the timer built in the cooling / heating unit 1 to supply the hot air. Send it in.

   As a result, as shown by arrows in FIG. 3, cold air and hot air circulate in the compartment 8 and are discharged from the cold / hot air discharge ports 5 and 7 to the cooling / heating unit 1 side. Temperature sensors 12 and 13 are provided near the outlets of the cold / hot air discharge ports 5 and 7 to detect the temperatures of the cold air and the hot air discharged from the compartment 8. Since the cold air and the hot air discharged from the cold / hot air discharge ports 5 and 7 are circulated in the compartment 8, the temperature sensors 12 and 13 show values that strongly reflect the temperature in the compartment 8. It will be. In this temperature management device, control is performed based on the outputs of these temperature sensors 12 and 13.

   FIG. 4 is a control system configuration diagram of the cooling / heating unit. The temperature sensors 12 and 13 correspond to those in FIG. The temperature sensors 12 and 13 are connected to a temperature management device 14, and the temperature management device 14 is connected to a cooling / heating unit control device 15. The cooling / heating unit control device 15 acquires the outputs of the temperature sensors 12, 13 via the temperature management device 14, and controls the heater 16, compressor 17 and fan 18 of the cooling / heating unit 1 based on them. The temperature in the compartment 8 of the distribution vehicle 3 is maintained within a predetermined range.

   In this embodiment, a plurality of cooling / heating units 1 are provided, and by setting a layout car 3 in each cooling / heating unit 1, a plurality of the layout cars 3 can be cooled and heated at the same time. The cooling / heating unit control device 15 of each cooling / heating unit 1 is connected to the master controller 20 via a communication line 19. Then, the master controller 20 sets the temperature, time schedule, and the like for each cooling / heating unit controller 15. Further, the master controller 20 includes an alarm device, and when the temperature sensors 12 and 13 indicate an abnormal temperature, the master controller 20 issues an alarm to alert the staff.

   For the abnormal temperature, the temperature management device 14 automatically determines whether the temperature in each compartment 8 is abnormal by automatically determining whether the temperature is refrigerated or warmed. Whether it is refrigerated or warm is determined based on the rate of change of the internal temperature, and the set temperature for issuing an abnormal temperature alarm is switched. In this way, a complicated detection circuit for detecting the operation mode of the cooling / heating unit control device 15 is not required, and an advanced connection work with the cooling / heating unit control device 15 is not required. When the device 15 is switched from the refrigeration mode to the refrigeration mode, or from the refrigeration mode to the refrigeration mode, the temperature management device 14 can also be automatically switched to the refrigeration mode or the refrigeration mode.

   Next, temperature management control of the temperature management device 14 will be described using the flowcharts shown in FIGS. This control is performed for each area divided into two left and right by the partition plate 11. That is, it is performed corresponding to the output of each of the two temperature sensors 12 and 13 connected to the temperature management device 14. Here, the case where temperature management of the area above the partition plate 11 of FIG. 3 is performed using the output of the temperature sensor 12, which is one of them, will be described.

Step 1: Read the set values of the temperature change rate R _H during the refrigeration operation and the temperature change rate _RC during the refrigeration operation from the master controller 20.

Step 2 ... low temperature alarm temperature during refrigeration operation (temperature at which food in the cabinet may freeze, eg 0 ° C.) T _CL , high temperature alarm temperature (temperature at which problems may occur in the hygienic condition of food in the cabinet, For example, the set values of T _CU and t _{C2 and} T _C1 and t _C2 of each delay time (time width for confirming that the temperature is not a temporary abnormal temperature, for example 30 seconds) are read from the master controller 20.

Step 3 ... Low temperature alarm temperature (temperature at which meal warming feels insufficient, for example, 60 ° C.) T _HL , high temperature alarm temperature (temperature at which tray may be deformed, for example, 120 ° C.) T _HU , Then, the set values of the respective delay times t _H1 and t _H2 are read from the master controller 20.

Step 4 ... reads the output of the temperature sensor 12 is held as the temperature T _1.

Step 5... Wait for the time t _d set as the sampling interval.

Step 6 ... reads the output of the temperature sensor 12 is held as the temperature T _2.

Step 7 ... temperature T _2, is compared with the high temperature alarm temperature T _CU during refrigerating operation, it is determined whether temperature T ₂ is equal to or less than the high temperature alarm temperature T _CU.

Step 8 ... temperature T ₂ is not less than the high temperature alarm temperature T _CU, despite being refrigerating operation, the temperature of the target area of the compartment 8 is in an abnormal high temperature. Therefore, in order to determine whether the high temperature is due to an abnormality in the refrigeration operation or the operation mode of the cooling / heating unit control device 15 is switched to the refrigeration operation, the temperature increase rate (T ₂ −T ₁ / t _d) it is determined whether or not the temperature change rate R _H over time Yutakazo operation.

If step 9 ... Yutakazo temperature change rate R _H over during operation, it is determined that switching to the Yutakazo operation.

Rewrites the step 10 ... temperatures _{T 1} at a temperature _{T 2.} Thereafter, the process proceeds to A of FIG. 6 in order to execute the temperature management process during the warming operation.

Step 11 ... If the temperature increase rate is not equal to or higher than the temperature change rate _RH during the refrigeration operation in Step 8, it is determined that the refrigeration operation is being performed, and a timer TM for determining the duration of the high temperature state in the target area. ₁ is counted.

Step 12: the count value of the timer TM ₁ is, it is determined whether or not within the low temperature alarm delay time t _C1 during refrigerating operation. If it is within the delay time t _C1 , the temperature inside the warehouse may temporarily rise due to, for example, the opening / closing door 9 of the laying wheel 3 being opened. Return to processing to do.

Step 13 ... When the delay time t _C1 is exceeded, it is considered that an essential temperature abnormality has occurred, not the open / close door 9 or the like, and an alarm signal is transmitted to the master controller 20. An alarm is generated by screen display.

Step 14: Step 7, temperature _{T 2} is when there below the high temperature alarm temperature _{T CU,} temperature _{T 2} is determined whether a low alarm temperature _{T CL} more.

Step 15 ... temperature T ₂ is not the low temperature alarm temperature T _CL more, i.e., if there is an abnormal low temperature target area, and counts of the timer TM ₂ for viewing the duration of the abnormal low temperature in the target area .

The count value of the step 16 ... timer TM ₂ is, determines whether within a low temperature alarm delay time t _C2 during refrigerating operation. If there within the delay time t _C2, temporarily for temperature-compartment is determine whether or not that reduced back to processing for temperature detection again.

Step 17: When the delay time t _C2 is exceeded, it is considered that an essential temperature abnormality has occurred, and an alarm signal is transmitted to the master controller 20, and the master controller 20 issues an alarm by sound, screen display, or the like.

In Step 18 ... step 14, if there at temperature _{T 2} is low alarm temperature _{T CL} more, it means abnormal temperature did back timer TM _1, clears the timer TM ₂ in the initial state.

Rewrites the step 19 ... temperatures _{T 1} at a temperature _{T 2.} Thereafter, the process returns to step 5 to execute the next temperature management process.

  The following processing is executed as the temperature management processing during the warming operation that moves from step 10 in FIG.

Step 20 ... wait only time t _d that is set as the sampling interval.

Step 21 ... reads the output of the temperature sensor 12 is held as the temperature T _2.

And Step 22 ... temperature T _2, is compared with the low-temperature alarm temperature T _HL during Yutakazo operation, temperature T ₂ is determined whether or not it is more than the low temperature alarm temperature T _HL.

Step 23: When the temperature T ₂ is not a low alarm temperature T _HL above, despite being Yutakazo operation, the temperature of the target area of the compartment 8 is in an abnormal low temperature. Therefore, in order to determine whether the low temperature is due to abnormal storage operation or whether the operation mode of the cooling / heating unit control device 15 is switched to the refrigerating operation, the temperature increase rate (T ₂ −T ₁ It is determined whether or not / t _d ) is equal to or less than the temperature change rate _RC during the refrigeration operation.

Step 24: If the temperature change rate _RC during the refrigeration operation is equal to or less than _RC, it is determined that the refrigeration operation of the previous distribution vehicle has been completed, the refrigeration operation of the next distribution vehicle has been started.

Rewrites the step 25 ... temperatures _{T 1} at a temperature _{T 2.} Then, in order to perform the temperature management process at the time of refrigeration operation, it moves to B of FIG.

Step 26 ... If the temperature increase rate is not less than the temperature change rate _RC during the refrigeration operation in step 23, it is determined that the refrigeration operation is being performed, and a timer TM for determining the duration of the low temperature state in the target area. A count of ₃ is performed.

The count value of the step 27 ... timer TM ₃ is, it is determined whether within a low temperature alarm delay time t _H2 at Yutakazo operation. If the time is within the delay time t _H2 , the temperature in the storage may temporarily decrease for some reason. Therefore, in order to determine the temperature, the process returns to the process for detecting the temperature again.

Step 28 ... If the delay time t _H2 is exceeded, it is considered that an essential temperature abnormality has occurred, and an alarm signal is transmitted to the master controller 20, and an alarm is issued by sound, screen display, etc. in the master controller 20.

In Step 29 ... step 22, temperature _{T 2} is when there at low alarm temperature _{T HL} above, temperature _{T 2} is equal to or smaller than a high-temperature alarm temperature _{T HU.}

Step 30 ... temperature T ₂ is not below the high temperature alarm temperature T _HU, i.e., if there is an abnormal high temperature target area, and counts of the timer TM ₄ for viewing the duration of the abnormally high temperature state of the target area .

The count value of the step 31 ... timer TM ₄ is, it is determined whether within a high temperature alarm delay time for Yutakazo operation t _H1. If it is within the delay time t _H1 , the process returns to the process for detecting the temperature again in order to determine whether or not the internal temperature has risen temporarily.

Step 32... If the delay time t _H1 is exceeded, it is considered that an essential temperature abnormality has occurred, and an alarm signal is transmitted to the master controller 20, and an alarm is generated by sound, screen display, etc. in the master controller 20.

If there temperature _{T 2} in step 33 ... step 29 below the high temperature alarm temperature _{T HU,} it means abnormal temperature did return timer TM _3, clears the timer TM ₄ in the initial state.

Rewrites the step 34 ... temperatures _{T 1} at a temperature _{T 2.} Thereafter, the process returns to step 20 to execute the next temperature management process.

   In the above embodiment, the master controller 20 issues an alarm by sound, screen display, etc., but each cooling / heating unit control device 15 or temperature management device 14 may issue an alarm. Further, in the above-described embodiment, the individual allocation vehicle has been described in the case of supplying cold air / hot air from the external cooling / heating unit 1 without incorporating the cooling / heating device. The present invention can also be applied to a garage with a built-in device.

It is a figure which shows the state which set the layout vehicle to the cooling / heating unit. It is a figure which shows an example of a layout vehicle. It is a horizontal sectional view of the thing of FIG. It is a control system block diagram of a cooling and heating unit. It is a front | former part of a temperature management flowchart. It is a back | latter stage part of a temperature management flowchart.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cooling / heating unit 2 ... Connection port 3 ... Wheel arrangement 4 ... Cold wind inlet 5 ... Cold air outlet 6 ... Cold / hot air inlet 7 ... Cold / hot air outlet 8 ... Compartment 9 ... Opening / closing door 10 ... Tray 11 ... Partition plate 12, 13 ... Temperature sensor 16 ... Heater 17 ... Compressor 18 ... Fan 19 ... Communication line

Claims (3)

The cooling / heating device is switched between the refrigeration mode and the refrigeration mode, and the inside temperature of the refrigerated / cold storage vehicle that can be refrigerated and stored in the storage is detected by a temperature sensor, and the refrigeration is performed. A temperature management device for a cold and warm distribution car that issues an abnormal temperature warning signal when an abnormal temperature is reached in each of the mode and the warm mode.
A temperature management device for a cold / hot storage distribution vehicle characterized by determining whether it is refrigerated or warmed based on the rate of change of the internal temperature and switching the set temperature for issuing an abnormal temperature alarm signal. 2. The temperature management device for a cold / hot storage distribution vehicle according to claim 1, wherein an alarm signal is issued on condition that the abnormal temperature state has continued for a predetermined time or longer. The temperature management device for a cold / hot storage distribution vehicle according to claim 1 or 2, wherein the temperature sensor is provided in the vicinity of a cold / hot air discharge port from the interior to the cooling / heating device.

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