JPH05340657A - Refrigerating plant - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the temperature controller for controlling the temperature inside the refrigerator malfunctions, backup refrigeration operation is performed so that the temperature inside the refrigerator does not fluctuate, and the quality of the cold storage product is maintained. .. A compressor 4 is controlled to start / stop by an operating temperature adjusting means 10 and temperature is controlled so that the inside temperature is maintained at a set temperature, while an alarm temperature adjusting means 11 changes the inside temperature of the stored product When the warning temperature that deteriorates the quality is monitored, and the warning temperature adjusting means 11 detects the warning temperature, the switching means 12 replaces the warning temperature adjusting means 11 with the operating temperature adjusting means 10 and controls the temperature. To function as.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus used for cooling a freezer or a refrigerator, and more particularly to a refrigerating apparatus capable of performing a refrigerating operation in which the quality of stored products does not deteriorate even if a temperature controller for operation fails. Regarding the device.

[0002]

2. Description of the Related Art In a conventional freezing / refrigerating unit,
A temperature controller is provided to control the start and stop of the compressor in order to keep the temperature inside the refrigerator at the set temperature.For example, when the contact of the output part is on, the temperature inside the refrigerator is high, so the compressor is driven. On the contrary, when the contact is off, the compressor is stopped and the start / stop control allows the internal cold storage temperature to fall within a temperature range having a slight differential with respect to the set temperature. Such prior art is disclosed in, for example, Japanese Patent Laid-Open No. 61-11.
It is disclosed in Japanese Patent No. 4042. There is also a prior art using a thermistor for temperature control, which is disclosed in, for example, Japanese Patent Laid-Open No. 62-5053.

[0003]

If the temperature controller is damaged during operation and the contact of the output section remains on, the compressor continues to operate and becomes too cold. If a low temperature injury is given and the contact is left off, the compressor stops operating and the temperature inside the chamber rises, causing a high temperature injury to the cooling object.

Such a problem occurs not only when the contact of the output section is damaged but also when the thermistor provided for detecting the temperature in the refrigerator fails, and the same problem occurs in the refrigerator even when the short circuit state or the open state occurs. The temperature fluctuates greatly and damages the coolant. In the past, in response to such problems,
Another temperature detector detects that the temperature inside the refrigerator fluctuates greatly, and an alarm is issued to alert the operator, but this is a backup that suppresses temperature fluctuations in the event of an abnormality. It cannot be.

An object of the present invention is to automatically perform a backup refrigerating operation so as not to damage the cooled product even when the temperature controller for controlling the internal temperature of the storage device becomes abnormal, and the stored product is stored. It is an object of the present invention to provide a refrigerating device capable of maintaining the quality of.

[0006]

The present invention compares the detected internal temperature with a set temperature corresponding to an appropriate storage temperature, and outputs an operation signal for driving the compressor 4 or a stop signal for stopping. The temperature adjusting means 10 and the preset temperature can be set and changed to the appropriate storage temperature and a warning temperature that impairs the quality of stored products, and the detected internal temperature and the preset temperature corresponding to the warning temperature are compared to generate an alarm. Alarm temperature adjusting means 11 for outputting a signal or safety signal, and alarm temperature adjusting means 1
In response to the output of the alarm signal by the controller 1, the compressor 4 is driven by the safety signal of the alarm temperature adjusting means 11 instead of the operating temperature adjusting means 10, and the compressor 4 is stopped by the alarm signal. The refrigerating apparatus is characterized by including a switching means (12) for performing the operation.

The present invention also provides a temperature control means 10 for operation.
Is a refrigerating apparatus that is adjusted to a set temperature corresponding to the frozen storage temperature, and the alarm temperature adjusting means 11 is adjusted to a set temperature of a high temperature level corresponding to a thawing temperature higher than the frozen storage temperature.

The present invention also provides a temperature control means 10 for operation.
However, in the refrigerating apparatus, the temperature is adjusted to a set temperature corresponding to a cold storage temperature at which freezing does not occur, and the alarm temperature adjusting means 11 is adjusted to a set temperature of a low temperature level corresponding to a freezing start temperature lower than the cold storage temperature. is there.

Further, according to the present invention, the temperature control thermistor 6 and the alarm thermistor 7 provided in the refrigerator are compared with the temperature inside the refrigerator detected by the temperature control thermistor 6 and the set temperature corresponding to the proper storage temperature, and the compression is performed. Temperature control circuit unit 2 that outputs an operation signal for driving the machine 4 or a stop signal for stopping
1. The temperature adjusting means 20 and the temperature adjusting means 20 are provided with an alarm circuit section 22 that outputs an alarm signal when the temperature difference between the inside temperature detected by the alarm thermistor 7 and the set temperature exceeds a predetermined value. The refrigerating apparatus is characterized by including switching means 12 for switching and connecting the alarm thermistor 7 to the temperature control circuit portion 21 in place of the temperature control thermistor 6 in response to outputting the alarm signal.

[0010]

According to the present invention, during normal operation, the compressor 4 is automatically started and stopped by the operation signal and the stop signal output from the operation temperature adjusting means 10, and the internal temperature is controlled to the set temperature. If the operating temperature adjusting means 10 malfunctions and causes abnormal operation of the compressor 4, for example, if the stored product is frozen and the temperature rises to near the thawing temperature, the alarm temperature adjusting means 11 sends an alarm signal. Outputs and informs of abnormality. In response to the output of the alarm signal, the switching means 12 is operated to switch the start / stop control of the compressor 4 by the alarm temperature adjusting means 11. At that time, since the set temperature can be changed by the alarm temperature adjusting means 11, by changing the setting to the proper storage temperature,
Stable freezing operation continues.

The operating temperature control means 10 breaks down while the stored products are kept at a low temperature that does not lead to freezing, and the compressor 4
Similarly, when the engine continues to operate and becomes abnormally cold, similarly, the start / stop control of the compressor 4 is controlled by the temperature control means 11 for alarm in accordance with the operation of the temperature control means 11 for alarm and the switching means 12.
By doing so, it is possible to eliminate the excessive coldness.

According to the present invention, the temperature control means 20 including the temperature control thermistor 6, the alarm thermistor 7, the temperature control circuit section 21 and the alarm circuit section 22 controls the temperature of the compressor 4 with automatic start / stop. While doing
If the temperature control thermistor 6 is short-circuited or opened due to a failure, the switching means 12 is activated and the alarm thermistor 7 can be switched to the temperature control thermistor 6 to function as the temperature control. Therefore, it is possible to maintain the internal cold storage temperature at the set temperature by continuing the stable freezing operation without stopping or abnormally operating the freezing operation.

[0013]

1 is a block diagram schematically showing the electrical construction of a refrigerating apparatus according to an embodiment of the present invention. The power supply wiring 5 is connected to the electric circuit in the outdoor unit 1 including the compressor 4 and the outdoor fan (not shown), and the electric wiring of the indoor unit 2 is connected by the connecting wiring 8 and the remote control box is connected by the connecting wiring 9. 3 electrical circuits are connected. The remote control box 3 is formed as an operation unit for remotely controlling the start and stop of the compressor 4 and the outdoor fan of the outdoor unit 1, and an unillustrated internal fan provided in the internal unit 2, and the internal unit 2 is disposed, for example. Installed on the wall near the freezer door. To the electric circuit of the remote control box 3, a temperature control thermistor 6 and an alarm thermistor 7 which are installed in the indoor unit 2 are connected.

FIG. 2 shows the remote control box 3 in FIG.
3 is a wiring diagram of an internal electric circuit of FIG. This electric circuit is realized by an operating temperature adjusting means 10 realized by an operating temperature controller having a temperature controlling thermistor 6 as a temperature detecting element and an alarm temperature controller having an alarming thermistor 7 as a temperature detecting element. A temperature control means 11 for alarm, a switching means 12 realized by an open / close switch, a start compensation timer 13 realized by a three-minute timer, a buzzer 14, a relay 15,
First and second indicator lights 16 and 17 are provided.

The operating temperature controller 10 is -25 to -5 ° C.
Set temperature selected from the frozen storage temperature range of
25 ° C. is compared with the internal temperature detected by the temperature control thermistor 6, and when the internal temperature is high, the output contact 10A is closed, and when the internal temperature is low, the output contact 10A is opened. The output contact 10A, the output contact 10A that closes when the start compensation timer 13 times up, and the output contact that closes when the start compensation timer 13 times out are connected in series, and the motor coil of the compressor 4 of the outdoor unit 1 further includes They are connected in series, and this series circuit is connected between the power supply R and S phases.

The temperature controller 11 for alarm is -25 to + 5 ° C.
Of the set temperature selected from the temperature range, for example, −5 ° C., which corresponds to a higher thawing temperature than the frozen storage temperature, and the temperature inside the refrigerator detected by the alarm thermistor 7 are compared, When it is high, the output contact 11A is closed, and when it is low, it is opened. The output contact 11A and the normally closed contact of the relay 15 are connected in series, and the buzzer 1
4 and the first indicator lamp 16 are connected in series in a parallel circuit,
This series circuit is connected between the R and S phases of the power supply.

On the other hand, the open / close switch 12 has an output contact 10
The wiring connecting A and the output contact of the start-up compensation timer 13 and the wiring connecting the output contact 11A and the normally open contact of the relay 15 are connected to each other. The second indicator light 17 is connected in parallel to the coil 15C of the relay 15, and the parallel circuit has output contacts that are closed in a normal state of the refrigeration system protection circuit 18 provided on the outdoor unit 1 side connected in series. A circuit is connected between the R and S phases of the power supply.

The operation of the electric circuit shown in FIG. 2 is performed as follows. Since the refrigeration system is in the normal state, the output contact of the protection circuit 18 is closed and the relay 15 is in the excited state, so the buzzer 14 and the first indicator lamp 16 are in the non-energized state. By opening and closing the open / close switch 12, the compressor 4 is controlled to start / stop by the operating temperature controller 10, and is started after the stop for at least 3 minutes by the operation of the start compensation timer 13 at the start.

During the freezing operation, the first indicator light 16 is turned on, the buzzer 14 is activated, and the second indicator light 17 is turned off. If this state continues for several hours, for example, one hour,
Since the output contact 11A of the alarm temperature controller 11 remains closed, it is determined to be abnormal. That is, it is conceivable that the inside of the refrigerator is higher than the set temperature of the temperature controller 11 for alarm −5 ° C., the output contact 10A is opened, and the compressor 4 is stopped. Therefore, the open / close switch 12
Is switched from open to closed, and the temperature controller 11 for alarm controls the start and stop of the compressor 4. At the same time, the temperature setting value of the alarm temperature controller 11 is changed from -5 ° C to -25 ° C. By doing so, even if the operating temperature controller 10 is out of order and is in an abnormal state, the alarm temperature controller 11 can continue the backup refrigeration operation.

FIG. 3 is a wiring diagram of the internal electric circuit of the remote control box in the refrigerating apparatus of another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS. 1 and 2 and corresponding parts bear the same reference numerals. It should be noted that, in this embodiment, the refrigerating device is provided in the refrigerator for refrigeration, the set temperatures of both temperature controllers 10 and 11 are different from those in the above-mentioned embodiment, and the switching means 12 is provided. A changeover switch is used as the operation switch to be formed.

That is, the operating temperature controller 10 is -5.
The set temperature is selected from within the cold storage temperature range that does not lead to freezing at -20 ° C, and is set to 5 ° C, for example. On the other hand, the temperature controller 11 for alarm has a set temperature selected from within a freezing temperature range lower than the cold storage temperature of -10 to 15 ° C, for example, set to 0 ° C. On the other hand, the changeover switch 12
It is provided in the electric circuit so that the switching contact is connected in series to the output contact 10A or the output contact 11A.

The operation of the electric circuit shown in FIG. 3 is performed as follows. Changeover switch 1 for normal refrigeration operation
2 is set on the operating temperature controller 10 side as shown in FIG. The compressor 4 is controlled to start and stop by the operating temperature controller 10, while the first indicator lamp 16 is turned off and the buzzer 14 is turned off.
Is in a non-energized state.

When the buzzer 14 sounds and the first indicator lamp 16 lights up during the freezing operation and this state continues for a predetermined time, the output contact 11A of the alarm temperature controller 11 is closed. Because of this, it is judged that the abnormality is too cold. Therefore, the changeover switch 12 is switched to the alarm temperature controller 11 side, and the temperature controller 11 controls the start / stop of the compressor 4. At the same time, the temperature setting value of the alarm temperature controller 11 is changed from 0 ° C to 5 ° C. By doing so, the backup refrigeration operation can be performed by the alarm temperature controller 11.

FIG. 4 is a block diagram schematically showing the electrical construction of a refrigerating apparatus according to another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIG. 1, and the corresponding parts bear the same reference numerals. Notable is the remote control box 3
Temperature control means 20 realized by a temperature controller provided in the
Is provided with a temperature control circuit section 21 having the temperature control thermistor 6 as a temperature detection element and an alarm circuit section 22 having an alarm thermistor 7 as a temperature detection element.
2 is provided so that the temperature control circuit portion 21 can be connected to the temperature control thermistor 6 or the alarm thermistor 7 by switching.

The temperature setting conditions in the temperature control circuit section 21 and the alarm circuit section 22 are the same as those of both temperature controllers 10 and 11 shown in FIG. 2 or 3, and can be used for freezing or refrigerating. it can.

FIG. 5 is a flow chart for explaining the operation of the electric circuit shown in FIG. The control mode of the refrigerating operation will be described below with reference to FIGS. 4 and 5. Step a
If the normal refrigeration operation is performed at 1 and the temperature control thermistor 6 becomes abnormal, and the resistance value becomes a short circuit state close to 0, or an open state becomes ∞, step a
2 or step a3, this abnormal state is detected in the temperature adjusting means 20, for example, by a resistance change of the alarm thermistor 7, and the process proceeds to step a4 or step a5, and the temperature control thermistor 6 is abnormal. Judge,
An abnormal signal is output. Based on this abnormal signal, the process proceeds to the next step a6 or step a7, and the changeover switch 12 is changed from the solid line state in FIG. 4 to the broken line state. Therefore, the alarm thermistor 7 is used as the temperature detecting element of the temperature control circuit unit 21 in place of the abnormal temperature control thermistor 6, and thus the temperature control circuit unit 21 to which the alarm thermistor 7 is connected. By this, temperature control is performed smoothly and backup refrigeration operation can be continued without any problems.

[0027]

As described above, according to the present invention, when the operating temperature adjusting means 10 for controlling the temperature in the refrigerating device may lose its control function due to damage to the temperature detecting portion or the like, an alarm is issued. Since the temperature control means 11 for alarm, which originally functions as an abnormality alarm, can be made to function as the temperature control by the switching means 12 instead of the temperature control means 10 for operation, the temperature control means 11 can be used in case of failure of the temperature controller or the like. The backup refrigeration operation is reliably performed, and it is possible to prevent deterioration of the quality of the cooled material and to perform stable refrigeration operation.

Further, according to the present invention, even in the refrigerating apparatus in which the temperature is controlled by the thermistor 6, it is possible to perform the reliable backup refrigerating operation by the alarm thermistor 7.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing an electrical configuration of a refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is a wiring diagram of an internal electric circuit of a remote control box 3 in FIG.

FIG. 3 is a wiring diagram of an internal electric circuit of a remote control box 3 in a refrigerating apparatus according to another embodiment of the present invention.

FIG. 4 is a block diagram schematically showing an electrical configuration of a refrigerating apparatus according to another embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation of the electric circuit shown in FIG.

[Explanation of Codes] 4 Compressor 6 Temperature Control Thermistor 7 Alarm Thermistor 10 Operating Temperature Adjusting Means 11 Alarm Temperature Adjusting Means 12 Switching Means 20 Temperature Adjusting Means 21 Temperature Control Circuit Section 22 Alarm Circuit Section

Claims (4)

[Claims] 1. An operating temperature adjusting means 10 for comparing the detected inside temperature with a set temperature corresponding to an appropriate storage temperature, and outputting an operation signal for driving the compressor 4 or a stop signal for stopping the compressor 4, and a set temperature. It is possible to change the setting to the appropriate storage temperature and a warning temperature that impairs the quality of stored goods, compare the detected internal temperature and the set temperature corresponding to the warning temperature, and output an alarm signal or a safety signal. In response to the warning temperature adjusting means 11 and the warning temperature adjusting means 11 outputting the warning signal, the compressor 4 is driven by the safety signal of the warning temperature adjusting means 11 instead of the driving temperature adjusting means 10. A refrigerating apparatus comprising: a switching unit 12 for controlling the operation of stopping the compressor 4 in response to an alarm signal. 2. The operating temperature adjusting means 10 is adjusted to a set temperature corresponding to the frozen storage temperature, and the alarm temperature adjusting means 11 sets a high temperature level corresponding to the thawing temperature higher than the frozen storage temperature. The refrigerating apparatus according to claim 1, which is adjusted to a temperature. 3. The operating temperature adjusting means 10 is adjusted to a set temperature corresponding to a cold storage temperature at which freezing does not occur, and the alarm temperature adjusting means 11 is a low temperature corresponding to a freezing start temperature lower than the cold storage temperature. The refrigeration system according to claim 1, wherein the refrigeration system is adjusted to a level set temperature. 4. A thermistor 6 for temperature control, an alarm thermistor 7, and a thermistor 6 for temperature control which are provided in the refrigerator.
The temperature control circuit unit 21 that outputs the operation signal for driving the compressor 4 or the stop signal for stopping the temperature is compared with the set temperature corresponding to the appropriate storage temperature, and the warehouse detected by the alarm thermistor 7 is compared. Temperature adjusting means 20 including an alarm circuit section 22 that outputs an alarm signal when the temperature difference between the internal temperature and the set temperature exceeds a predetermined value, and in response to the temperature adjusting means 20 outputting the alarm signal, A refrigeration system comprising: switching means 12 for switching and connecting an alarm thermistor 7 to the temperature control circuit section 21 in place of the temperature control thermistor 6.