JP5311855B2 - Low temperature storage - Google Patents

Description

  The present invention relates to a low-temperature warehouse in which cool air exchanged with a cool storage agent is circulated and cooled in a storage chamber by a blower, and more particularly to a battery that supplies power to the blower.

  Conventionally, this kind of low temperature storage is shown, for example in patent document 1 as a refrigerator used in a low temperature article transport system. In other words, in such a logistics system, an AC power source cannot be used during transportation of a low-temperature warehouse. Therefore, a battery is installed in the low-temperature warehouse, and a storage room for storing low-temperature articles and a cold storage agent are arranged in the insulation box of the low-temperature warehouse. The freezing chamber is formed, and the cool air cooled by the latent heat of fusion of the regenerator is circulated and cooled by a direct current (DC) blower driven by a battery.

In order to use the cold storage agent in a frozen state, in the above publication, a refrigeration cycle composed of an electric compressor, an evaporator, and the like is mounted in a low-temperature storage, and the electric motor is installed at a place where an AC power source such as a delivery base is provided A method is adopted in which the compressor is driven and the cool storage agent is frozen by the evaporator, and then the low-temperature storage is separated from the AC power source and placed on the truck. In this case, a charger for rectifying the connected AC power source is provided in the low temperature storage, and the battery is charged by this charger while the regenerator is frozen.
JP-A-3-70962

  As described above, the battery is deteriorated by repeatedly performing the charge / discharge, and the terminal voltage to be compared at the time of full charge gradually decreases. For this reason, in the conventional low temperature storage, when the terminal voltage of the battery at the time of full charge falls below a predetermined voltage value, battery error information is output by a display lamp or the like, and the user is prompted to replace the battery.

  However, in such a device, before the battery error information is output, there is a case where the fan cannot be operated for a predetermined time because the terminal voltage is not sufficient.

  Therefore, the present invention has been made to solve the conventional technical problems, and provides a low-temperature storage capable of appropriately grasping the deterioration state of the battery and effectively using the battery in accordance with this.

The low temperature storage of the present invention includes a storage room for storing articles, a cool storage agent for cooling the storage room, a blower for circulating cold air heat-exchanged with the cool storage agent into the storage room, and a battery for supplying power to the blower And having a control device for controlling the operation of the blower and charging the battery, the control device stores the terminal voltage of the battery in a fully charged state when the battery is charged. The current terminal voltage is compared with the average value of the terminal voltage at the time of past charging, and when the difference is more than the first reference value, the first notification operation is executed, and the difference is the first When it is less than the reference value, the battery terminal voltage and the rated voltage in the fully charged state are compared, and the difference is more than the second reference value , and the battery is charged more than the specified number Is the second announcement When the battery is not replaced by the second notification operation, the operation time is calculated from the terminal voltage, and when the predetermined operation time can be secured, the calculated operation time is calculated. The operation time is output .

The low temperature storage according to the invention of claim 2 is characterized in that, in the above , the control device performs a notification operation when the difference is opened more than a predetermined value a plurality of times continuously.

According to the present invention , a storage chamber for storing articles, a cool storage agent for cooling the storage chamber, a blower for circulating cold air heat-exchanged with the cool storage agent into the storage chamber, and a battery for supplying power to the blower. In a low-temperature storage provided with a control device that controls the operation of the blower and charging the battery, the control device stores the terminal voltage of the battery in a fully charged state when the battery is charged, If the difference is more than the first reference value and the first notification operation is executed, the battery is abnormal due to some failure. It is possible to notify by a notification operation that the terminal voltage has suddenly decreased.

  As a result, the battery can be quickly replaced, and the low temperature storage can be operated smoothly.

  If the difference is less than the first reference value, the terminal voltage of the battery in the fully charged state is compared with the rated voltage, and if the difference is more than the second reference value, the second notice is made. Since the operation is executed, it is possible to appropriately grasp the deterioration state of the battery and notify that the blower can be operated in a short time based on this.

  Thereby, the use according to the deterioration condition of the battery can be promoted, and a smooth operation of the low temperature storage can be realized.

In particular, when the control device compares the terminal voltage of the battery and the rated voltage in the fully charged state, the difference is more than the second reference value , and the battery is charged more than a predetermined number of times. When the second notification operation is executed and the battery is not replaced by the second notification operation, the operation time is calculated from the terminal voltage, and the predetermined operation time can be secured. Since the calculated operable time is output , use according to the operable time can be urged, and a smooth operation of the low temperature storage can be realized.

According to the invention of claim 2, in the above invention , the control device performs an error notification operation due to a malfunction by executing a notification operation when the difference has been continuously opened more than a predetermined value a plurality of times. This can be avoided beforehand.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a low temperature chamber R of the present invention, FIG. 2 is a partially cutaway rear perspective view of the low temperature chamber R, FIG. 3 is a longitudinal side view of the low temperature chamber R, and FIG. Show.

  In the embodiment, in the state where the AC power source is connected at the delivery base, the low temperature storage R operates the compressor by receiving the supply of the AC power source, performs the cold storage operation for freezing the cold storage agent, and supplies articles such as food. After storage, the AC power supply is cut off and loaded on the platform of a delivery vehicle such as a truck, and during the delivery, the cool air cooled by circulating the cool air cooled by the latent heat of fusion of the cool storage agent to the storage room It is a low temperature storage.

  The low-temperature chamber R is composed of a heat insulating box 1 that opens to the front, and a storage chamber 2 for storing articles is formed in the heat insulating box 1. A door 15 for opening and closing is provided on the front surface of the storage chamber 2, and a machine room 3 is formed above the heat insulating box 1. In addition, wheels 4... For movement are attached to the four corners of the lower surface of the low temperature chamber R.

  A duct plate 7 is attached to the rear surface of the storage chamber 2 with a space from the heat insulating box 1, and a rear duct 9 is formed between the duct plate 7 and the heat insulating box 1. A discharge port that communicates the rear duct 9 and the inside of the storage chamber 2 is formed at the top of the duct plate 7, and a blower 12 for circulating cold air is provided at the discharge port. This blower 12 is a direct current (DC) blower fed by a battery 25 installed in the machine room 3.

  Further, a temperature sensor 22 for detecting the temperature in the storage chamber 2 is provided in the storage chamber 2, and the temperature sensor 22 is connected to the control device C.

  Then, a heat insulating partition plate 16 is installed on the bottom surface of the storage chamber 2 with a predetermined distance from the bottom surface of the heat insulating box 1, whereby the cold storage chamber partitioned from the storage chamber 2 is formed below the heat insulating box 1. 17 is configured. In the cold storage chamber 17, a plurality of flat plate-like cold storage agents 18 are provided across the left and right sides. The regenerator 18 is cooled by a cooler 20 that constitutes a cooling device together with a compressor 19, a condenser 23, and a condenser blower 24 installed in the machine room 3.

  All the gaps between the cool storage agents 18 in the cool storage chamber 17 are communicated with the rear duct 9, and the outer sides of the cool storage agents 18 located at both ends are respectively communicated with suction ducts (not shown) formed on the left and right of the rear duct 9. The

  FIG. 4 shows an electrical block diagram of the control device C. The control device C is constituted by a general-purpose microcomputer, and includes a memory 37 as a storage means, a means for counting the number of times the battery 25 has been charged (charge number detection means) 38, and the like.

  On the input side of the control device C, the temperature sensor 22, a control panel 28 provided in front of the low temperature chamber R, a battery charging current detection circuit (charging current value detection means) 33, and a battery voltage monitoring circuit (terminal) Voltage detection means) 34 and the like are connected. The control panel 28 is provided with a notification lamp 29 and a display unit 30. Further, the compressor 19, the condenser blower 24, the blower 12, and the like are connected to the output side.

  Here, a compressor 19 and a rectifier circuit 32 are connected to a commercial AC power supply 31 connected in a delivery base or the like. A battery charging circuit 35 is connected to the rectifier circuit 32, and a battery 25 charged by the battery charging circuit 35 is connected in series.

  A power supply switching circuit 36 is connected to the rectifier circuit 32 and the battery 25, and the blower (DC) 12 and the control device C are connected to the switching circuit 36. The switching circuit 36 switches the power supplied to the control device C and the blower 12 from the AC power supply 31 to the battery 25 power supply when the commercial AC power supply is disconnected.

  A battery charging current detection circuit 33 that monitors a charging state from the charging current of the battery 25 is connected between the charging circuit 35 and the battery 25, and between the switching circuit 36 and the battery 25, A battery voltage monitoring circuit 34 for monitoring the discharge state of the battery 25 is connected. As described above, the battery charging current detection circuit 33 and the battery voltage monitoring circuit 34 are connected to the control device C.

  With the above configuration, the low temperature storage R receives the supply of the AC power supply 31 in a state where the AC power supply 31 is connected in the delivery base, operates the compressor 19, and freezes the regenerator 18. At this time, when power is supplied from the AC power supply 31, the switching circuit 36 operates the blower 12 with the power from the AC power supply 31 via the rectifier circuit 32. Then, after storing an article such as food in the low-temperature warehouse R, the AC power supply 31 is disconnected and loaded on the carrier of a delivery vehicle such as a truck. During the delivery, the cool air cooled by the latent heat of fusion of the regenerator 18 Is circulated through the storage chamber 2 for cooling. At this time, the switching circuit 36 operates the blower 12 by the power supply from the battery 25 because the AC power supply 31 is disconnected.

  At this time, the temperature in the storage chamber 2 is detected by a temperature sensor 22 provided in the storage chamber 2, whereby the operation of the blower 12 is controlled by the control device C, and the temperature in the storage chamber 2 is The cooling temperature is set in advance on the control panel 28.

  Next, control during charging of the battery 25 will be described with reference to FIGS. When the AC power supply 31 is connected, the battery 25 is charged by the charging circuit 35 via the rectifier circuit 32. At this time, the charging circuit 35 monitors the value of the charging current to the battery 25 by the battery charging current detection circuit 33. When the charging current value decreases, the charging circuit 35 determines that the battery 25 is fully charged. , Stop charging. Then, the user is notified of the fully charged state by turning on a notification lamp 29 provided on the control panel 28. At this time, the control device C counts the number of times of charging by the built-in number of times of detecting means and stores it in the memory 37.

  As shown in the flowchart of FIG. 5, when the control device C determines that the battery is fully charged based on the detected current value of the battery voltage monitoring circuit 34 (step S1), the battery 25 in the fully charged state is detected by the battery voltage monitoring circuit 34. The terminal voltage of is detected. Each time, the control device C stores the terminal voltage value of the battery 25 at the time of full charge in the built-in memory 37.

  In step S <b> 2, the control device C compares the current terminal voltage with the average value of the terminal voltage of the battery 25 at the time of full charge stored in the memory 37 so far. In this embodiment, the average value of the terminal voltages used for the comparison is an average value calculated from the terminal voltages for the five nearest times (not limited to this) stored in the memory 37.

  6 and 7 show changes in the terminal voltage of the battery 25 stored in the memory 37 every time the battery is fully charged. FIG. 6 shows a state in which the terminal voltage at the time of full charge gradually decreases due to repeated charging and discharging, and FIG. This shows a state in which the terminal voltage has dropped.

  Therefore, the control device C compares the present terminal voltage acquired this time with the average value of the past terminal voltages, and the difference between them is a predetermined reference value (first reference value. In this embodiment, 2. 0V) or more, for example, if the current terminal voltage is 10V, but the average value of the past terminal voltage is 12V, it is determined that the terminal voltage has suddenly decreased. The process proceeds to step S3.

  In step S <b> 3, the control device C charges the battery 25 again by the charging circuit 35. Similarly to the above, when the fully charged state is determined based on the detected current value of the battery voltage monitoring circuit 34, the terminal voltage of the battery 25 in the fully charged state is detected by the battery voltage monitoring circuit 34. In step S4, the current terminal voltage acquired this time is compared with the average value of the past terminal voltages in the same manner as in step S2.

  Also in this case, if the difference between the terminal voltages is equal to or greater than a predetermined reference value (first reference value, here, 2.0 V as in the above case), the battery 25 is abnormal due to some cause. Is expected to occur and will soon become unusable.

  Therefore, the control device C proceeds to step S5, and displays (outputs) a battery error on the display 30 of the control panel 28 as a predetermined notification operation. The notification operation is not limited to this, and may be output by a notification lamp, output by a buzzer or sound, and the like.

  Accordingly, it is possible to notify the user by the notification operation as described above that an abnormality has occurred in the battery 25 due to some failure and that the terminal voltage has suddenly decreased. Therefore, the battery can be replaced quickly, and the low temperature storage R can be operated smoothly.

  Further, in the present embodiment, the control device C continuously detects that the difference between the current terminal voltage and the average value of the past terminal voltage is opened twice or more continuously (not limited to this, but a plurality of times) In such a case, since the notification operation is executed, an error notification operation due to malfunction can be avoided in advance. Therefore, the reliability of the notification operation can be improved.

  On the other hand, the control device C determines that the battery 25 is normal when the difference between the compared terminal voltages is less than a predetermined reference value (first reference value) in step S2 and step S4 as described above. It progresses to step S6.

  In step S <b> 6, the control device C compares the current terminal voltage with the rated voltage stored in advance in the memory 37. Here, the rated voltage is a terminal voltage when the battery 25 is fully charged when it is new before aging, and is 13 V in the battery 25 used in this embodiment.

  When the difference between the current terminal voltage and the rated voltage is less than a predetermined reference value (second reference value; in this embodiment, several V level; a value larger than the first reference value). In step S7, it is determined that the battery 25 is normal. In this embodiment, no special display or the like is performed during normal operation.

  On the other hand, if the difference between the compared current terminal voltage and the rated voltage is greater than or equal to a predetermined reference value (second reference value) in step S6, the process proceeds to step S8, and the number of charge detection means The number of charging times counted by 38 and currently stored in the memory 37 is examined.

  It is determined whether or not the current number of times of charging is greater than a predetermined reference number (a preset durability number). When the number is less than the reference number, the control device C proceeds to step S9 and charges the battery 25 by the charging circuit 35. As described above, when the control device C determines that the battery is fully charged based on the detected current value of the battery voltage monitoring circuit 34, the control device C detects the terminal voltage of the battery 25 in the fully charged state.

  Then, the process proceeds to step S10, and the current terminal voltage acquired this time is compared with the rated voltage as in step 6 above.

  When the difference between the current terminal voltage and the rated voltage is less than a predetermined reference value (second reference value), the process proceeds to step S11, and the battery 25 is determined to be normal. On the other hand, if these differences are greater than or equal to a predetermined reference value, the process proceeds to step S12, and a battery error is displayed (output) on the display 30 of the control panel 28 as a predetermined notification operation. The notification operation is not limited to this, and may be output by a notification lamp, output by a buzzer or sound, and the like.

  In this case, although the number of times of charging is small, it is determined that an abnormality has occurred in the battery 25 due to some failure and the terminal voltage has decreased, and the abnormality of the battery 25 is used by the notification operation as described above. It is possible to notify the person. Therefore, the battery can be replaced quickly, and the low temperature storage R can be operated smoothly.

  In such a case as well, the control device C causes the difference between the current terminal voltage and the rated voltage to have been opened twice or more consecutively (not limited to this) more than a predetermined reference value. Since the notification operation is executed, an error notification operation due to a malfunction can be avoided in advance. Therefore, the reliability of the notification operation can be improved.

  On the other hand, in step S8, when the current number of times of charging is greater than a predetermined reference number (preset durability number), the control device C proceeds to step S13 and performs a predetermined notification operation of the control panel 28. On the display 30, the battery replacement information is displayed (output). The notification operation is not limited to this, and may be output by a notification lamp, output by a buzzer or sound, and the like.

  If battery replacement is executed in step S14 according to the output of the battery replacement information, the process returns to step S1, and if battery replacement is not performed, the process advances to step S15.

  In step S15, the control apparatus C calculates the operation possible time in the said low-temperature warehouse R from the present terminal voltage acquired this time. For calculation of the operable time, for example, a relationship diagram of the operable time with respect to the terminal voltage in the fully charged state as shown in FIG. 8 is used.

  That is, as described above, since the current terminal voltage is more than the rated voltage and a predetermined reference value (second reference value), the operating time is at least as long as FIG. It becomes less than predetermined operation possible time (A time).

  On the other hand, when the current terminal voltage is a terminal voltage that can secure a predetermined operable time (B time) shorter than the A time, the short-time driving is performed as shown by hatching in FIG. It becomes possible.

  Therefore, if the operable time calculated from the current terminal voltage can secure the B time in step S15, the control device C proceeds to step S16 and sets the calculated operable time on the control panel 28. While being displayed on the display unit 30, it is urged to be used as a low temperature chamber R that is driven for a short time. Thereafter, the process returns to step S15 each time the battery is charged.

  On the other hand, in step S15, if the operable time calculated from the current terminal voltage cannot be secured, the control device C proceeds to step S17, and displays the indicator 30 of the control panel 28 as a predetermined notification operation. The battery replacement information is displayed (output). The notification operation is not limited to this, and may be output by a notification lamp, output by a buzzer or sound, and the like.

  Thus, when the terminal voltage of the battery 25 and the rated voltage in the fully charged state are compared, even when the difference is more than the second reference value, the battery 25 is charged more than a predetermined number of times. Since the terminal voltage is reduced in a fully charged state due to deterioration over time, it can be predicted that the terminal voltage gradually decreases thereafter.

  Therefore, after properly grasping the deterioration state of the battery 25, the operation possible time is calculated from the terminal voltage at the time of full charge, and outputted, so that the short-time driving low temperature chamber R corresponding to the operation possible time is obtained. Use can be promoted, and smooth operation of the low-temperature chamber R can be realized.

  Therefore, the use according to the deterioration state of the battery 25 can be promoted, and the battery 25 can be effectively used.

It is a perspective view of the low-temperature warehouse of the present invention. It is a partial notch back perspective view of a low-temperature warehouse. It is a vertical side view of a low-temperature warehouse. It is an electrical block diagram of a control apparatus. It is a flowchart at the time of a full charge. It is a figure which shows the change of the terminal voltage of a full charge state. (Normal) It is a figure which shows the change of the terminal voltage of a full charge state. (When abnormal) It is a related figure of the operation possible time with respect to the terminal voltage of a full charge state.

R Low temperature storage C Control device 1 Heat insulation box 2 Storage room 3 Machine room 12 Blower 17 Cold storage room 18 Cold storage agent 19 Compressor 20 Cooler 22 Temperature sensor 25 Battery 28 Control panel 29 Notification lamp 30 Display 31 AC power supply 32 Rectifier circuit 33 Battery Charging Current Detection Circuit 34 Battery Voltage Monitoring Circuit 35 Battery Charging Circuit 36 Power Supply Switching Circuit 37 Memory 38 Charge Count Detection Means

Claims (2)

A cryogenic chamber comprising a storage room for storing articles, a cold storage agent for cooling the storage room, a blower for circulating cold air heat-exchanged with the cold storage agent into the storage room, and a battery for supplying power to the blower Because
A control device that controls the operation of the blower and the charging of the battery; the control device stores the terminal voltage of the battery in a fully charged state when the battery is charged; Compare with the average value of the terminal voltage at the time of past charging, if the difference is more than the first reference value, perform the first notification operation,
When the difference is less than the first reference value, the terminal voltage of the battery in the fully charged state is compared with a rated voltage, and the difference is more than a second reference value, and the battery is open. When the number of times of charging is greater than the predetermined number of times, the second notification operation is executed,
If the battery has not been replaced by the second notification operation, the operable time is calculated from the terminal voltage. If the predetermined operable time can be secured, the calculated operable time is Low temperature storage characterized by output . 2. The low temperature storage according to claim 1, wherein the control device executes the notification operation when the difference opens more than a predetermined value continuously for a plurality of times .

Images