JPH0833265B2 - Chiller display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a display device for a cooling machine.

2. Description of the Related Art As a cooling device, a cooling unit having a compressor, a condenser, an evaporator, and a flow path switching valve, and the cooling unit is sequentially and repeatedly controlled in the order of a refrigerant recovery operation, a cooling operation, and a hot gas defrosting operation. A device equipped with a controller is disclosed in
No. 63-65273.

In the control circuit of the cooling device in this publication, a power switch for arbitrarily operating power feeding and non-power feeding to the cooling device is usually connected between the cooling device and the power source. Then, when the power switch is turned on, the cooling unit is configured to start the operation from the refrigerant recovery operation in response to a command from the controller, and the operation state is displayed on the display device.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional technique, in a refrigerator such as a freezer or a refrigerator, a power switch is turned off, or when the operation of the refrigerator is temporarily stopped, The operating state and the temperature inside the refrigerator may not be displayed on the display device, and after that, the operator may forget to turn on the power switch or restart the operation. In such a case, in the past, in what kind of state the chiller is operating, how much the temperature inside the refrigerator is, and furthermore, the temperature inside the refrigerator is abnormally high. There is a problem that it is not possible to monitor and display whether or not there is a simple device and intelligibly.

Therefore, in the present invention, when the power switch of the cooling machine is turned off, or when the operation of the cooling machine is temporarily stopped, further, even during the refrigerant recovery operation or the draining operation, (EN) Provided is a display device of a cooler capable of monitoring and displaying the temperature inside a refrigerator with a simple device.

[Means for Solving the Problems] Means for Solving the Problem The present invention has a cooling unit for cooling the inside of a storage, a controller for controlling the operation of the cooling unit, an operation stop switch connected to the controller, and a display device. The display device has an internal temperature display unit, an operating state display unit, and an abnormality notification unit. The operating state display unit has a cooling lamp and a defrosting lamp. Sometimes the cooling lamp is turned on, the defrosting lamp is turned on during the defrosting operation, the defrosting lamp is blinked during the refrigerant recovery operation, the cooling lamp is blinked during the draining operation, and the cooling lamp and the defrosting lamp are turned on when the operation is stopped. It is intended to provide a display device of a cooler in which both of them are turned off.

Action When the controller receives the operation stop signal from the operation stop switch, it forcibly stops the operation of the cooling unit and continuously operates the display device that displays the operating state of the cooling unit and the temperature inside the refrigerator. Since it is configured, even if the cooling unit is stopped, the temperature inside the storage is displayed to inform the outside of the storage and the temperature abnormality during the stop is monitored to manage the cooling target. I am trying.

In addition, since the cooling device is not stopped until after the refrigerant recovery operation is completed, liquid back to the compressor does not occur when the cooling operation is restarted, and it is possible to immediately move to efficient heat exchange, which is necessary. It is possible to prevent the above internal temperature rise.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

A cooling unit 1 constitutes a refrigerant circuit having a main refrigerant flow path A and an auxiliary refrigerant flow path B.

The main refrigerant flow path A includes a compressor 2, a three-way valve SV1 as a flow path switching valve, an outdoor heat exchanger (hereinafter referred to as a condenser because it functions as a condenser during a cooling operation) 4, a liquid receiver 5, and waste water The dish heating coil 6, the second control valve SV2, the expansion valve 7, the indoor heat exchanger (hereinafter referred to as the evaporator) 8, the accumulator 9 and the like are sequentially connected in an annular pipe. The three-way valve SV1 forms a refrigerant flow path in the direction of the solid line arrow in FIG. 3 [this is called the first flow path] during the refrigerant recovery operation, the cooling operation, and the first defrosting operation described later, and the second defrosting operation During the frost operation, control is performed so as to form the refrigerant flow path in the direction of the broken line arrow in FIG. 3 [this is called the second flow path]. Further, a check valve 11 is provided on the liquid refrigerant outlet side of the liquid receiver 5 so as to flow the refrigerant toward the heating coil 6, and a check valve 12 is provided in parallel with the series portion of the expansion valve 7 and the second control valve SV2. And the third control valve SV3 are connected to each other. Further, the parallel portion of the fourth control valve SV4 and the check valve 16 is connected between the evaporator 8 and the accumulator 9.

The auxiliary refrigerant flow path B is provided from the second outlet of the three-way valve 3 to the evaporator 8
And the fourth control valve SV4 between the first auxiliary flow path B1 having a check valve 21 for allowing the refrigerant to flow, and the refrigerant from the gas refrigerant outlet side of the liquid receiver 5 toward the inlet side of the accumulator 9. It is composed of a second auxiliary flow passage B2 having a fifth control valve SV5 flowing, and a third auxiliary flow passage B3 having a check valve 23 connecting the outlet side of the check valve 11 and the inlet side of the condenser 4. .

Reference numeral 31 is an outdoor unit, 32 is an indoor unit, and 33 is a pipe connecting both the indoor and outdoor units. Both indoor and outdoor units
The cooling unit is represented by combining 31, 32 and the pipe 33.

The cooling unit 1 keeps the freezing / refrigerating room such as a prefabricated refrigerator at a set temperature while repeating a series of operations of a refrigerant recovery operation → a cooling operation → a first defrosting operation → a second defrosting operation → a refrigerant recovery operation. In addition, the temperature control is performed, and the operation is controlled by the operation control device S of the cooling device described later. It should be noted that the first defrosting operation and the second defrosting operation of this example are combined to show a normal defrosting operation.

 Here, the operation control device S will be described.

51 is a three-phase AC power supply, 52 is an outdoor unit control unit, 53 is an indoor unit control unit, 54 is both indoor and outdoor unit control units 52, 53
It is a relay box that stores various relay groups in.

52C is a normally-closed contact magnetic switch corresponding to the magnet coil MC that is connected to the power supply lines X, Y, and Z and that controls the power supply to the compressor motor CM. Reference numeral 61 is a high / low pressure switch for detecting the pressure on the suction side of the compressor. When the pressure of the compressor 2 is equal to or higher than a predetermined pressure due to an abnormality of the compressor 2 or the like, the high pressure side contact is opened to a constant pressure lower than the predetermined pressure. When the pressure is lower than the pressure, the low-pressure side contact is opened to stop the operation of the compressor. 62 is a relay contact corresponding to the first relay R1 that switches the three-way valve SV1 to the first flow path or the second flow path, and 63 is a timer corresponding to the time limiter T1 that determines the operation time of the first defrosting operation described later. The contacts, 64 and 65 are the second relay R2 and the third relay R3 for controlling the opening and closing of the second control valve SV2 and the third control valve SV3, respectively.
Corresponding to the relay contact, 66 is the 4th control valve SV4, 5th control valve
The relay contact on the normal fourth contact side corresponding to the fourth relay R4 that opens one of the SV5, 52F is the magnetic contact corresponding to the sixth relay R6 that controls the operation of the evaporator fan motor FM, and 52H is the evaporator A magnet contact corresponding to the seventh relay R7 that controls the energization of the fan heater FH, and TR is a transformer connected to the input / output board and the power supply lines X and Z in the relay box 54.

Reference numeral 70 denotes a central microcomputer controller for controlling the operation of the cooling unit 1, which is connected to the relay box 54. Further, 71 is a temperature detecting device for detecting the temperature in the freezing / refrigerating room, and the detection signal thereof is controlled by the controller.
Send to 70. 72 is a controller provided separately from the main power switch (not shown) connected to the three-phase AC power supply 51.
The operation stop switch is connected to 70 and outputs a signal for switching the operation and stop of the cooling unit 1 (that is, an operation start signal and a stop signal). Reference numeral 73 is a display device provided in the controller unit C that houses the controller 70, and includes a temperature display section 74 that displays the temperature in the freezer-refrigerating chamber,
Operating status display section 75 that displays the operating status of the cooling unit 1
And an abnormality notification unit 76 for notifying an abnormality such as a temperature abnormality in the storage chamber and an abnormality of the cooling unit 1.

The temperature display section 74 is composed of a 7-segment LED display (hereinafter referred to as a display) 81 that digitally displays the temperature, and the operation status display section 75 is a cooling lamp 82 indicating a cooling operation and a defrosting operation indicating a defrosting operation. The abnormal state display unit 76 includes a lamp 83, a temperature abnormality lamp 84 indicating a temperature abnormality, a cooling unit abnormality lamp 85 indicating an abnormality of the cooling unit, and an alarm device 86 such as an alarm buzzer that emits an alarm sound at the time of abnormality. Consists of.

The controller 70 includes a central processing unit, a RAM (random access memory) that provides data to the central processing unit, and an R
It is equipped with an OM (read-on memory) and a time limiter that performs a timing operation according to the operating status of the cooling unit. A brief description will be given of the operation flow for the operation control of the cooling unit 1 in this controller 70. To do.

When the main power switch is turned on, the controller 70
A refrigerant recovery operation start signal is output to the cooling unit (step S1). After that, when the refrigerant recovery operation by this signal is completed (see step S2 to Yes), the position of the operation stop switch 72 is confirmed, and if it is on the operation side (see step S3 to Yes), the cooling operation is performed in the cooling unit. A start signal is output (step S4), and if it is on the stop side (see steps S3 to No), a cooling operation stop signal is output to the cooling unit (see step S14).

When the cooling operation is completed (steps S5 to Ye
s), the first defrosting operation start signal and the timer count signal are output to the cooling unit 1 (step S6), and when the time set by the time limit means [set to 90 seconds in this example] has elapsed (see steps S7 to Yes). ), And outputs the second defrosting operation start signal and the count clear signal (step S8).

After that, when the defrosting completion detection device (not shown) detects the completion of defrosting (see step S9 to Yes), a pump down [that is, refrigerant recovery] operation start signal is output (step S10).

When the suction side pressure of the compressor 2 is reduced by the pump down operation and the low pressure side contact of the high / low pressure switch 16 is opened (see step S11 to Yes), a draining operation start signal and a timer count signal are output (step S12). . After this, draining time by the timed means [set to 15 minutes in this example]
When has elapsed (see step S13 to Yes), the process returns to step S3.

On the other hand, when the cooling operation stop signal of the cooling unit is output and the operation stop switch 72 is on the stop side, the cooling operation stop signal continues to be output (see step S15 to No), and when the operation side is switched ( (See steps S15 to Yes), and then to step S4.

Next, an operation flow of the display device 73 by the controller 70 will be described.

First, check the position of the operation stop switch 72 (step S101), and if it is on the driving side, output the inside temperature display signal (see step S102). If it is on the stop side, stop the cooling operation on the cooling unit. Output signal (step
S131).

Then, it is confirmed whether or not the cooling unit is in the cooling operation (step S103), the cooling lamp 82 is turned on during the cooling operation (step S109), and the cooling lamp 82 is turned off when the cooling operation is completed (step S104). reference). Further, it is confirmed whether or not the defrosting operation is being performed (step S105), the defrosting lamp 83 is turned on if the defrosting operation is being performed (step S110), and the defrosting lamp 83 is turned on if the defrosting is completed. Turn off the light (step
S106).

Furthermore, it is confirmed whether or not the pump down operation and the drainage operation are performed (step S107), and if the pump down operation is in progress, the defrost lamp 83 is blinked (step S111), and if the pump down operation is completed. The defrost lamp 83 is turned off (see step S108), and the cooling lamp 82 is blinked (step S112). The blinking of the cooling lamp 82 represents a fan delay time for preventing the warm air generated during defrosting from being blown out from the cooling unit into the refrigerator.

Next, it is confirmed whether or not the temperature inside the storage is abnormal (step S121), and when a temperature abnormality occurs, the temperature abnormality lamp 84 is blinked and the alarm buzzer 86 is informed (step S125), and there is no temperature abnormality. When it is finished, the temperature abnormality lamp 84 is turned off and the alarm buzzer 86 stops the notification operation (step S122).

Then, it is confirmed whether or not there is an abnormality in the cooling unit 1 (step S123), and when there is an abnormality, the cooling unit abnormality lamp 85 blinks and the alarm buzzer 86 is informed (step S126), and the cooling unit is instructed. When there is no abnormality or when there is no abnormality, the cooling unit abnormality lamp 85 is turned off and the alarm buzzer 86 stops the notification operation (step S124).

On the other hand, following step S131, the controller 70 outputs an in-compartment temperature display signal (step S132), further confirms whether or not the temperature in the storage is abnormal (step S133), and when an abnormal temperature occurs, the abnormal temperature lamp 84 Blinks and the alarm buzzer 86 is informed (step S136). When there is no temperature abnormality or when it ends, the temperature abnormality lamp 84
Is turned off and the alarm buzzer 86 notification operation is stopped (step S134).

Further, the position of the operation stop switch 72 is confirmed (step S135), and if it is on the operation side, step S101
If it is on the stop side, the process returns to step S131.

The operation of the cooling unit 1 will be described based on the above configuration.

(I) However, a description will be given of the operation operation when the stored goods are properly stored in the freezing / refrigerating chamber and the operation stop switch 72 is on the operation side [this is the normal operation operation].

(1) First, by turning on a main power switch (not shown), the controller 9 outputs a refrigerant recovery operation start signal (step S1), while an internal temperature display signal is output (see step S102). The temperature inside the refrigerator is displayed on the display 81. In addition, by this refrigerant recovery operation start signal, AC power is applied via the magnet switch 52C, the compressor motor CM is started, and the first, third, and fifth relays R1 and R3 are activated.
-R5 is energized, the three-way valve SV1 becomes the second flow path, the third and fifth control valves SV3, SV5 are opened, and a refrigerant flow path similar to the second defrosting operation described later is formed. Then, when 2 minutes have elapsed due to the time counting operation by the time limiting means, the first, third, fifth
The power to each relay R1, R3, R5 is stopped, and the fourth relay R4
The fourth control valve SV4 is opened and the operation of the compressor 2 is performed to perform a refrigerant recovery operation for recovering the refrigerant in the evaporator 8 (see the thick line in FIG. 6 for the refrigerant flow path at this time).

(2) By this refrigerant recovery operation, when the suction side pressure of the compressor 2 drops below a certain pressure and the low pressure side contact of the high / low pressure switch 61 opens, the compressor motor CM is stopped once and the controller The cooling operation start signal is output from 70.

(3) By this signal, the power supply to the first relay R1 is cut off, the three-way valve SV1 is switched to the first flow path, and the second and sixth relays R1
When 2 · R6 is energized, the second control valve SV2 is opened, the fan motor FM starts operating, and the compressor motor CM is driven to form a refrigerant passage as shown by the thick line in FIG. When the cooling operation of the cooling unit 1 is started, the cooling lamp 82 is turned on to clearly indicate that the cooling operation is in progress (see step S109). By this cooling operation, the inside of the freezing / refrigerating chamber is cooled, and the temperature inside the refrigerator is lowered.

(4) When the temperature inside the room decreases after the cooling operation is started and the temperature detecting device 71 detects that the temperature is below the set temperature, the second and sixth relays R2 and R6 are de-energized, The second control valve SV2 closes and the fan motor FM stops operating. Then, similarly to the refrigerant recovery operation, the suction side pressure of the compressor 2 gradually decreases, and when the pressure falls below a certain pressure, the low pressure side contact of the high / low pressure switch 61 is opened, and the compressor motor CM is stopped to perform the cooling operation. Is paused.

(5) When the room temperature rises due to the temporary stop of the cooling operation and the temperature detecting device 72 detects that the temperature is higher than the reset temperature, the same operation as (4) above is performed and the cooling unit 1 cools again. Drive.

The following (4) and (5) [that is, on / off operation] is repeated to maintain the room at the set temperature. This on / off operation is collectively referred to as a cooling operation.

(6) After the cooling operation is started, when the time counting operation by the timing means elapses for a predetermined time [8 hours in this example], the controller 72 determines that the cooling operation has ended, and the controller 72 outputs a count clear signal for the timing means. Is output, the first defrosting start signal is output, and the count signal is output to the time limiter again. Based on this signal, the 2nd, 4th and 6th relay R2
・ The power supply to R4 and R6 is stopped and the second and fourth control valves SV2 and SV4
Closed and the fan motor FM stopped, and the 3rd and 5th
The relays R3 and R5 are energized to open the third and fifth control valves SV3 and SV5. Therefore, while the cooling unit 1 stops the cooling operation, the refrigerant passage as shown by the thick line in FIG. 4 is formed to start the first defrosting operation, while the cooling lamp 82 is turned off (step S104). The defrost lamp 83 is turned on (see step S110).

In this first defrosting operation, the high-temperature high-pressure gas refrigerant leaving the compressor 2 becomes a high-temperature high-pressure gas-liquid mixed refrigerant in the condenser 4, and is separated into liquid and gas in the liquid receiver 5, and the liquid refrigerant is the main refrigerant. Channel A
Is sent to the inlet side of the evaporator 8 while the gas refrigerant is sent to the accumulator 9 through the second auxiliary flow path B2 and the rest to the outlet side of the evaporator 8 through the check valve 16. To be That is, since the refrigerant flows into the evaporator 8 from both inlet and outlet sides, the high temperature liquid refrigerant in the liquid receiver 5 heats the inlet side of the evaporator, and the gas refrigerant heats the outlet side of the evaporator 8. At this time, the sensible heat of the liquid refrigerant and the latent heat and sensible heat of the gas refrigerant remove the frost generated in the header portion and the hairpin portion of the evaporator 8. Further, since the high-temperature and high-pressure refrigerant can be sent to the evaporator 8 through almost half the path of the normal defrosting path, the refrigerant can be sent to the evaporator 8 in a short time, and Suitable for rapid heating.

Then, when 90 seconds have passed by the time limiter T1, the controller 70 determines that the first defrosting operation has ended, and outputs the second defrosting operation start signal and the count clear signal.

(7) By the second defrosting operation start signal, the first relay R1 is energized, the three-way valve SV1 is switched to the second flow path, and the refrigerant flow path as shown by the thick line in FIG. Gas defrosting is started.

And defrosting operation is continued and defrosting is performed well,
When the defrosting end detection means (not shown) detects the defrosting end, the controller 70 outputs a pump down [that is, refrigerant recovery] operation start signal.

(8) Due to this pump down operation start signal, the power supply to the first, third and fifth relays R1, R3, R5 is cut off and the three-way valve SV1
Is switched to the first flow passage and the third and fifth control valves SV3 and SV5 are closed, and the fourth control valve SV4 is opened, and a refrigerant flow passage as shown by the thick line in FIG. 6 is formed to perform pump down operation. At the same time, the defrost lamp 83 blinks (step S111).

When the pressure on the suction side of the compressor 2 gradually decreases due to the pump-down operation and the low-voltage side contact of the high / low pressure switch 61 opens, the compressor motor CM stops and the flow of refrigerant stops. The controller 70 determines that the pump-down operation is completed and outputs a draining operation start signal and a timer count signal.

(9) With this signal, although the refrigerant flow path is not changed at all, the cooling unit 1 is operated in order to remove the frost and ice blocks that are melted from the evaporator 8 and stored in the drain pan during the defrosting operation. Leave it stopped. And
When the timekeeping operation by the time means ends, the controller 70
Determines that the draining operation has been completed, and the step S3
To restart the cooling operation ((3) to (5) above)
reference). However, the fan motor FM starts the operation after the fan delay time for preventing the hot air blowout elapses (during this time, the cooling lamp 82 is blinking as shown in step S112).

Next, the operation when the operation stop switch 72 is switched to the stop side (stop signal is output) will be described.
The cases will be classified according to the operating state of the cooling unit 1.

(Ii) First, if a stop signal is output during the refrigerant recovery operation of the cooling unit, (a) the controller 70 is configured not to accept this signal until the refrigerant recovery operation of the cooling unit 11 is completed. Therefore, the cooling unit 1 continues the refrigerant recovery operation (see FIG. 6 for the refrigerant flow path).

(A) Then, when the suction side pressure of the compressor 2 is gradually decreased and the low pressure side contact of the high / low pressure switch 61 is opened, the compressor motor CM is stopped and the operation of the cooling unit 1 is stopped. Then, the inside temperature display signal is output from the controller 70 (step S132), and the inside temperature display on the display 81 is continued. At this time, the controller 70 outputs a cooling operation stop signal, so that the cooling unit 1 continues to stop.
After that, the cooling unit 1 is stopped until the operation stop switch 72 is switched to the operation side. During this time, the controller 70 monitors the temperature inside the refrigerator, and if there is no abnormality in the temperature inside the refrigerator, the temperature abnormality lamp 84 and the alarm buzzer 85 do not operate (see steps S133 and 134).

(Iii) Next, assuming that a stop signal is output during the cooling operation of the cooling unit, (c) the controller 70 immediately outputs the cooling operation stop signal, so that the second and sixth relays R2 and R6 are not energized. As the second control valve SV2 is closed and the fan motor FM is stopped, the refrigerant recovery flow path shown by the thick line in FIG. 6 is formed.

(D) When the suction side pressure of the compressor gradually decreases due to this pump down operation and drops below a certain pressure, it opens to the low pressure side contact of the high / low pressure switch 61, and the compressor motor CM
Is stopped, the flow of the refrigerant is stopped, and the cooling operation of the cooling unit is stopped. Then, the inside temperature display signal is output from the controller 70 (step S132), and the inside temperature display on the display 81 is continued. After that, the cooling unit 1 is stopped until the operation stop switch 72 is switched to the operation side. During this time, the controller 70 monitors the temperature inside the refrigerator, and if there is no abnormality in the temperature inside the refrigerator, the temperature abnormality lamp 84
And the alarm buzzer 85 does not operate (steps S133 and S134).
reference).

(Iv) When the stop signal is output while the cooling unit is in the first defrosting operation and the second defrosting operation, (e) the controller 70 causes the cooling unit 1 to perform the first defrosting operation to the second defrosting operation. Since the stop signal is not accepted until the series of operations from the frost operation to the pump down operation is completed, the cooling unit 1 continuously performs the first defrosting operation and the second defrosting operation, The operation shifts to the pump down operation (see (6) to (8) for its operation).

(F) When the suction side pressure of the compressor 2 is gradually decreased and the low pressure side contact of the high / low pressure switch 61 is opened, the compressor motor CM is stopped and the operation of the cooling unit 1 is stopped. At this time, since the controller 70 outputs the cooling operation stop signal, the cooling unit 1 stops without entering the cooling operation. Then, the controller 70 outputs an internal temperature display signal (step S132), and the display of the internal temperature on the display 81 continues. After that, the cooling unit 1 is stopped until the operation stop switch 72 is switched to the operation side. During this time, the controller 70 monitors the temperature inside the refrigerator, and if there is no abnormality in the temperature inside the refrigerator, the temperature abnormality lamp 84 and the alarm buzzer 85 do not operate (see steps S133 and 134).

(V) Even if a stop signal is output during the draining operation of the cooling unit, there is no change in the cooling unit that has already stopped operating and it continues to stop. However, when the time counting operation by the time limit means ends, the controller 70 Judges that the draining operation has ended, moves to step S14, outputs a cooling operation stop signal, and continues stopping the cooling unit 1. After that, the cooling unit is stopped until the operation stop switch 72 is switched to the operation side. Meanwhile, the controller
The internal temperature display signal is output from 70 (step S13
2), the display of the in-compartment temperature on the display 81 continues. After that, the cooling unit 1 is stopped until the operation stop switch 72 is switched to the operation side. During this time, the controller 70 monitors the temperature inside the refrigerator, and if there is no abnormality in the temperature inside the refrigerator, the abnormal temperature lamp 84 and the alarm buzzer 85 do not operate (see steps S133 and S134).

According to the above configuration, the stop signal of the operation stop switch 72 is configured to be accepted by the controller 70 only after the refrigerant recovery operation of the cooling unit 1 is completed. However, the cooling device 1 performs the refrigerant recovery operation and then stops. Therefore, when the cooling operation is restarted, the liquid does not return to the compressor, and the heat can be immediately transferred to the efficient heat exchange.

On the other hand, when the operation start signal is output from the operation stop switch 72, the cooling device 1 always starts the operation from the cooling operation, and the cooling operation can be quickly performed after the switch operation, which has occurred conventionally (I) ( The problem of II) can be solved and quenching becomes easier.

Further, since the controller 70 keeps the operation of the display device 73 even during the forced stop of the cooling unit 1 based on the operation of the operation stop switch 72, the temperature inside the refrigerator is monitored even when the cooling unit is stopped. In addition to the above, when the temperature inside the refrigerator abnormally occurs, the abnormality can be notified.

Therefore, after the stop operation by the operation stop switch 72,
Even if the user forgets to switch the switch 72 to the driving side, it can be observed by the temperature display change by the temperature display on the display device 73, and when an abnormality occurs, the temperature abnormality lamp 84 and the alarm buzzer 86 can be used. It is possible to notify the user and promptly switch to the driving side, which can contribute to the prevention of quality deterioration of in-store products.

[Effects of the Invention] According to the present invention described in detail above, the controller turns on the cooling lamp during the cooling operation, the defrost lamp during the defrosting operation, and the defrosting lamp during the refrigerant recovery operation, respectively.
During the drainage operation, the cooling lamps should each blink, and both the cooling lamp and the defrost lamp should be turned off when the power switch of the cooling machine is turned off or the operation of the cooling machine is temporarily stopped. Since the display device is controlled by the display device of the present invention, the display device of the present invention can monitor and display the temperature in the refrigerator and the operating state of the cooler with a simple device and in an easy-to-understand manner. Therefore, for example, when both the cooling lamp and the defrosting lamp are off, when a high temperature is displayed or a signal is output from the abnormality notification unit, it means that the operation of the cooler is stopped. You can quickly and easily know that the temperature is high.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention, FIG. 1 is a flow chart of a display operation by a controller, FIG. 2 is a schematic circuit diagram of an operation control device, and FIGS. 3 to 6 are refrigerant flow paths in each operation state. 7 is a schematic view of the controller, and FIG. 8 is an operation flowchart of the cooling unit by the controller. 1 ... Cooling unit, S ... Cooling device operation control device,
70 …… Controller, 72 …… Stop switch, 73 ……
Display unit, 74 ... Temperature display unit, 75 ... Operating status display unit,
76: Abnormal condition display section.

Claims (1)

[Claims] 1. A cooling unit for cooling the inside of a storage, a controller for controlling the operation of the cooling unit, an operation stop switch connected to the controller, and a display device, wherein the display device displays the inside temperature. Section, an operation state display section, and an abnormality notification section, and the operation state display section has a cooling lamp and a defrosting lamp, and the controller has a cooling lamp during the cooling operation and defrosting during the defrosting operation. The lamps are turned on, and the defrost lamp is turned on during the refrigerant recovery operation, the cooling lamp is turned on and off during the water draining operation, and both the cooling lamp and the defrost lamp are turned off when the operation is stopped. And the display device of the cooler.