JP2008241121A - Malfunction detecting device, malfunction detecting method and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect an abnormal reduction in the temperature of refrigerant discharged from a refrigerating plant. <P>SOLUTION: The malfunction detecting device is provided for detecting the malfunction of the refrigerating plant 100 having a refrigerating cycle including a compressor 11. It comprises a discharge temperature detecting part 17 for detecting the discharge temperature of the compressor 11, a discharge pressure detecting part 18 for detecting the discharge pressure of the compressor 11, a suction temperature detecting part 15 for detecting the suction temperature of the compressor 11, a suction pressure detecting part 16 for detecting the suction pressure of the compressor 11, a comparison discharge temperature calculating part 19 for finding a comparison discharge temperature in accordance with the discharge pressure, the suction temperature and the suction pressure detected by the detecting parts, and an abnormality detecting part 19 for detecting that the discharge temperature is abnormal when the discharge temperature detected by the discharge temperature detecting part 17 is lower than the comparison discharge temperature found by the comparison discharge temperature calculating part 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an abnormality detection device, an abnormality detection method, and a control program for detecting an abnormality of a refrigeration apparatus having a refrigeration cycle including a compressor.

A refrigeration system equipped with a refrigeration cycle including a compressor is an important device for cooling a low-temperature showcase, for example, and quickly detects a failure of the refrigeration system in order to prevent product quality deterioration in the low-temperature showcase. It is important to.
Conventionally, when the discharge pressure of the refrigerant circulating in the refrigeration cycle of the refrigeration apparatus becomes higher than a preset determination value, this is detected as a high pressure abnormality in the refrigerant discharge pressure, and an abnormality is detected. It has been broken. Further, when a high pressure abnormality of the refrigerant is detected, a high pressure abnormality is avoided (see, for example, Patent Document 1).
JP 2004-286253 A

By the way, the abnormality of the refrigeration apparatus includes the abnormality of the discharge temperature of the refrigerant in addition to the abnormality of the high pressure. However, since the refrigerant discharge temperature varies greatly depending on the operating state of the refrigeration cycle and the outside air temperature, a predetermined value is set in advance as a determination value in order to detect an abnormality, and the determination value is compared with the discharge temperature. Therefore, it is difficult to detect an abnormality. In particular, when the operation of the compressor is stopped, the refrigerant discharge temperature decreases to substantially the same as the outside air temperature, so the actual discharge temperature is higher than the refrigerant discharge temperature assumed from the operating state of the refrigeration system. When the temperature is low, it is difficult to determine whether or not it is due to an abnormality of the refrigeration apparatus.
SUMMARY OF THE INVENTION An object of the present invention is to provide an abnormality detection device, an abnormality detection method, and a control program that can detect an abnormal drop in the refrigerant discharge temperature in a refrigeration apparatus.

In order to solve the above problems, an abnormality detection device of the present invention is an abnormality detection device that detects an abnormality of a refrigeration apparatus having a refrigeration cycle including a compressor, and detects a discharge temperature of the compressor. A discharge pressure detection unit that detects a discharge pressure of the compressor, a suction temperature detection unit that detects a suction temperature of the compressor, a suction pressure detection unit that detects a suction pressure of the compressor, and each detection A comparison discharge temperature calculation unit for obtaining a comparison discharge temperature based on the discharge pressure, the suction temperature, and the suction pressure respectively detected by the unit, and the discharge temperature detected by the discharge temperature detection unit And an abnormality detection unit that detects that the discharge temperature is abnormal when the discharge temperature is lower than the comparison discharge temperature obtained by the discharge temperature calculation unit.
According to the above configuration, the comparative discharge temperature calculation unit detects abnormal discharge temperature based on the discharge pressure, suction temperature, and suction pressure detected by the discharge pressure detection unit, suction temperature detection unit, and suction pressure detection unit, respectively. A comparative discharge temperature for detecting the decrease is obtained. The abnormality detection unit compares the discharge temperature for comparison thus obtained with the discharge temperature of the compressor actually detected by the discharge temperature detection unit, and compares the actual discharge of the compressor with respect to the comparison discharge temperature. Since an abnormality is detected when the discharge temperature is lower, an abnormal drop in the refrigerant discharge temperature in the refrigeration apparatus can be detected.

In the above configuration, the comparison discharge temperature calculation unit obtains a theoretical value of the discharge temperature of the compressor based on the discharge pressure, the suction temperature, and the suction pressure using a predetermined relational expression, and determines a predetermined value from the theoretical value. It is preferable that a value obtained by subtracting the value is set as the comparative discharge temperature.
The discharge temperature of the compressor is usually higher than the theoretical value. For this reason, an abnormal decrease in the discharge temperature of the compressor, that is, an abnormal decrease in the discharge temperature of the refrigerant in the refrigeration apparatus is detected by setting the value obtained by subtracting a predetermined value from the theoretical value as the comparison discharge temperature. Can do.

Further, the abnormality detection device of the present invention is an abnormality detection device that detects an abnormality of a refrigeration apparatus having a refrigeration cycle including a compressor, the discharge temperature detection unit detecting a discharge temperature of the compressor, and the compression A suction pressure detection unit for detecting the suction pressure of the machine, an outside air temperature detection unit for detecting the outside air temperature, and a comparison discharge for obtaining a comparison discharge temperature based on the suction pressure and the outside air temperature respectively detected by each detection unit When the discharge temperature detected by the temperature calculation unit and the discharge temperature detection unit is lower than the comparison discharge temperature obtained by the comparison discharge temperature calculation unit, it is detected that the discharge temperature is abnormal. And an abnormality detection unit that performs the above-described operation.
According to the above configuration, the comparison discharge temperature calculation unit is for comparison to detect an abnormal drop in the discharge temperature based on the suction pressure and the outside air temperature detected by the suction pressure detection unit and the outside air temperature detection unit, respectively. Obtain the discharge temperature. The abnormality detection unit compares the discharge temperature for comparison thus obtained with the discharge temperature of the compressor actually detected by the discharge temperature detection unit, and compares the actual discharge of the compressor with respect to the comparison discharge temperature. Since an abnormality is detected when the discharge temperature is lower, an abnormal drop in the refrigerant discharge temperature in the refrigeration apparatus can be detected.

In the above configuration, the comparison discharge temperature calculation unit includes a comparison discharge temperature association table in which a comparison discharge temperature is previously associated with an outside air temperature and a suction pressure of the refrigerant, and the outside air temperature detection unit It is preferable to read out the comparison discharge temperature corresponding to the outside air temperature detected by the above and the suction pressure detected by the suction pressure detection unit to obtain the comparison discharge temperature.
According to this configuration, the comparison discharge temperature correspondence table in which the comparison discharge temperature is associated with the outside air temperature and the refrigerant suction pressure in advance is provided, and the outside air temperature detected by the outside air temperature detection unit and the suction Since the comparison discharge temperature corresponding to the suction pressure detected by the pressure detection unit may be read, the comparison discharge temperature can be easily obtained.

Further, in the above configuration, the abnormality detection unit is configured such that the discharge temperature of the refrigerant detected by the discharge temperature detection unit continues for a predetermined time from the comparison discharge temperature obtained by the comparison discharge temperature calculation unit. When the temperature is low, it is preferable to detect that the discharge temperature is abnormal.
According to this configuration, when the discharge temperature is lower than the comparison discharge temperature for a predetermined time, it can be detected that the discharge temperature is abnormal. In this way, for example, when the discharge temperature falls momentarily below the comparative discharge temperature due to, for example, changing the operating state of the refrigeration apparatus, such as by switching the rotation speed of the compressor, it is possible to prevent detection of an abnormality. Can do.

Moreover, in the said structure, when it detects that the said discharge temperature has abnormality by the said abnormality detection part, it is preferable to provide the abnormality notification part which alert | reports it.
According to this configuration, when it is detected by the abnormality detection unit that there is an abnormality in the discharge temperature, it can be notified.

  The abnormality detection method of the present invention includes a refrigeration cycle including a compressor, a discharge temperature detection unit that detects a discharge temperature of the compressor, a discharge pressure detection unit that detects a discharge pressure of the compressor, An abnormality detection method for detecting an abnormality in a refrigeration apparatus comprising an intake temperature detection unit for detecting an intake temperature of a compressor and an intake pressure detection unit for detecting an intake pressure of the compressor, wherein the discharge temperature detection unit Detecting the discharge temperature of the compressor by the step, detecting the discharge pressure of the compressor by the discharge pressure detection unit, detecting the intake temperature of the compressor by the suction temperature detection unit, A process of detecting the suction pressure of the compressor by the suction pressure detector, and a process of obtaining a discharge temperature for comparison based on the discharge pressure, the suction temperature, and the suction pressure respectively detected by the detectors; The discharge temperature detected by the discharge temperature detecting section, wherein when lower than the comparative discharge temperature, comprising the the steps of: detecting that there is an abnormality in the discharge temperature.

  The control program of the present invention includes a refrigeration cycle including a compressor, a discharge temperature detection unit that detects a discharge temperature of the compressor, a discharge pressure detection unit that detects a discharge pressure of the compressor, and the compression Control for controlling, using a computer, an abnormality detection device for detecting an abnormality of a refrigeration apparatus, comprising an intake temperature detection unit for detecting an intake temperature of the compressor and an intake pressure detection unit for detecting an intake pressure of the compressor A discharge temperature detection unit that detects a discharge temperature of the compressor; a discharge pressure detection unit that detects a discharge pressure of the compressor; and a suction temperature detection unit that determines a suction temperature of the compressor. And detecting the suction pressure of the compressor by the suction pressure detection unit, and based on the discharge pressure, the suction temperature, and the suction pressure respectively detected by each detection unit Let seek 較用 discharge temperature, the discharge temperature the discharge temperature detected by the detection unit, when the lower than comparative discharge temperature, be detected that there is an abnormality in the discharge temperature, characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the abnormal fall of the discharge temperature of a refrigerant | coolant can be detected in a freezing apparatus.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a refrigeration apparatus 100 according to a first embodiment of the present invention. As shown in FIG. 1, the refrigeration apparatus 100 includes a refrigeration unit 10 and a plurality of showcases 20 cooled by the refrigeration unit 10.
First, the configuration of the showcase 20 will be described. The showcase 20 is installed in a store or the like and includes a plurality of display shelves on which foods and the like are displayed. The showcase 20 includes an indoor heat exchanger 21 that functions as an evaporator inside the housing, and the indoor heat exchanger 21 is connected to the refrigerator unit 10 via an expansion valve 22 through an indoor refrigerant pipe 23. An air blower (not shown) is provided in the showcase 20 so as to blow air to the indoor heat exchanger 21 and supply cold air after heat exchange into the showcase 20 so as to refrigerate or freeze food displayed on the display shelf. It is configured.

Next, the configuration of the refrigerator unit 10 will be described. The refrigerator unit 10 is configured as an outdoor unit disposed outside (outdoors) such as a store, and includes two compressors 11 connected in parallel and an outdoor refrigerant pipe 12 on the discharge side of the compressor 11. An outdoor heat exchanger 13 and a liquid receiver 14 to be connected are provided. An indoor heat exchanger 21 is connected to the suction side of the compressor 11 via an outdoor refrigerant pipe 12 and an indoor refrigerant pipe 23. In addition, the refrigerator unit 10 includes a blower (not shown), and outside air is blown to the outdoor heat exchanger 13 by the blower.
In the refrigeration apparatus 100, the compressor 11, the outdoor heat exchanger 13, the liquid receiver 14, the expansion valve 22, and the indoor heat exchanger 21 constitute a refrigeration cycle. In this refrigeration cycle, the refrigerant is compressed into a high-temperature and high-pressure gas in the compressor 11, and then is condensed by exchanging heat with the outside air in the outdoor heat exchanger 13 to become a supercooled liquid. The refrigerant that has become the supercooled liquid is temporarily stored in the liquid receiver 14, is expanded by the expansion valve 22 on the showcase 20 side, becomes a low-temperature low-pressure refrigerant liquid, and evaporates in the indoor heat exchanger 21. And the food etc. in the showcase 20 are refrigerated or frozen by taking away the heat of vaporization at the time of evaporation from the food etc. displayed in the showcase 20.

  In addition, the refrigerator unit 10 is sucked into the suction side of the compressor 11 by a suction temperature detection sensor 15 (suction temperature detection unit) that detects the suction temperature of the refrigerant sucked into the compressor 11 and the compressor 11. And a suction pressure detection sensor 16 (suction pressure detector) for detecting the suction pressure of the refrigerant. Further, on the discharge side of the compressor 11, a discharge temperature detection sensor 17 (discharge temperature detection unit) that detects a discharge temperature of the refrigerant discharged from the compressor 11, and a discharge pressure of the refrigerant discharged from the compressor 11 are set. A discharge pressure detection sensor 18 (discharge pressure detection unit) for detection is provided. The refrigerator unit 10 also has a control device 19 (comparison discharge temperature calculation unit, abnormality detection unit) that controls the compression operation of the compressor 11 based on an operation instruction signal or the like input from a remote control device, an operation panel, or the like. It has.

  The control device 19 includes a CPU (not shown), a control program executed by the CPU, a ROM (not shown) storing control data related to the control program, a program and various data processed by the CPU. RAM (not shown) for temporarily storing the data. The control device 19 reads the control program stored in the ROM according to the operation instruction content of the operation instruction signal, develops it in the RAM, and executes it to control the compression operation of the compressor 11 and the like. Further, the suction temperature, suction pressure, discharge temperature, and discharge pressure of the compressor 11 are input to the control device 19 from each of the above sensors, and the control device 19 detects abnormal discharge temperature, which will be described later, based on these sensor inputs. An abnormality detection process is performed to detect a decrease. When an abnormal drop in the discharge temperature of the compressor 11 is detected as a result of this abnormality detection process, the control device 19 sends a control signal to the abnormality notification device 30, and the abnormality notification device 30 causes the abnormal drop in the discharge temperature to be detected by the user. Let them know. However, the abnormality notification device 30 can be configured, for example, as an LED lamp for abnormality notification provided on an operation panel or the like, and can be configured to light up and notify the user when an abnormality is detected. . Moreover, it is good also as a structure which alert | reports that the abnormal notification apparatus 30 detected the abnormal fall of discharge temperature to the display panel etc. by the character etc.

Hereinafter, the abnormality detection process executed under the control of the control device 19 will be described with reference to FIG.
First, the control device 19 uses the suction temperature detection sensor 15, the suction pressure detection sensor 16, and the discharge pressure detection sensor 18 to suck the refrigerant sucked into the compressor 11, the suction pressure, and the refrigerant discharged from the compressor 11. The pressure is detected (step S1). At the same time, the discharge temperature detection sensor 17 detects the discharge temperature of the refrigerant discharged from the compressor 11 (step S1).
Next, the control device 19 obtains the theoretical value of the discharge temperature of the compressor 11 according to the following discharge temperature theoretical value calculation formula (1) based on the suction temperature, suction pressure, and discharge temperature detected in step S1. (Step S2).

(Discharge temperature theoretical value calculation formula)
T _o = (P _o / P _i ) ^{[(k−1) / k]} × (T _i +273.15) −273.15 (1)
However, in the above formula (1), T _o is the theoretical value of discharge temperature (° C.), T _i is the suction temperature (° C.), P _o is the discharge pressure (MPa (absolute pressure)), and P _i Is the suction pressure (MPa (absolute pressure)), and k is the specific heat ratio of the refrigerant. However, the specific heat ratio of the refrigerant varies depending on the type of the refrigerant. For example, when the refrigerant is R22, k = 1.184.

Next, a value obtained by subtracting a predetermined value from the theoretical value of the discharge temperature of the compressor 11 obtained in step S2 is obtained, and this value is set as a comparison discharge temperature (step S3). However, in this embodiment, the predetermined value is 5 ° C.
Then, the comparison discharge temperature obtained in step S3 is compared with the actual discharge temperature (hereinafter referred to as “detected discharge temperature”) of the compressor 11 detected by the discharge temperature detection sensor 17 in step S1, and detected. It is determined whether or not the discharge temperature is lower than the comparative discharge temperature (step S4). When the detected discharge temperature is equal to or higher than the comparison discharge temperature (step S4: N), the process returns to step S1. On the other hand, if the detected discharge temperature is lower than the comparative discharge temperature, it is next determined whether or not this state continues for a predetermined time (30 minutes in the illustrated example) (step S5). If the detected discharge temperature is lower than the comparative discharge temperature continuously for a predetermined time (step S5: Y), the control device 19 detects that the discharge temperature is abnormally lowered and controls the abnormality notification device 30. A signal is output to notify the abnormality notification device 30 of an abnormal decrease in the discharge temperature (step S6).

  According to the first embodiment described above, the control device 19 is based on the discharge pressure, the suction temperature, and the suction pressure detected by the discharge pressure detection sensor 18, the suction temperature detection sensor 15, and the suction pressure detection sensor 16, respectively. Thus, a comparative discharge temperature for detecting an abnormal drop in the discharge temperature is obtained. Then, the abnormality detection sensor compares the discharge temperature for comparison thus obtained with the discharge temperature of the compressor 11 actually detected by the discharge temperature detection sensor 17, and compares the compressor 11 with the discharge temperature for comparison. Since the abnormality is detected when the actual discharge temperature is lower, an abnormal drop in the refrigerant discharge temperature in the refrigeration apparatus 100 can be detected.

Further, according to the first embodiment, the control device 19 uses the discharge temperature theoretical value calculation formula (predetermined relational expression) (1) based on the discharge pressure, the suction temperature and the suction pressure of the compressor 11. A theoretical value of the discharge temperature of the compressor 11 is obtained, and a value obtained by subtracting a predetermined value (5 ° C.) from the theoretical value is used as the comparative discharge temperature.
The discharge temperature of the compressor 11 is usually higher than the theoretical value. For this reason, an abnormal decrease in the discharge temperature of the compressor 11, that is, an abnormal decrease in the discharge temperature of the refrigerant in the refrigeration apparatus 100 is detected by setting the value obtained by subtracting a predetermined value from the theoretical value as the comparison discharge temperature. can do.

  In the first embodiment, the control device 19 detects that the discharge temperature is abnormal when the discharge temperature of the refrigerant detected by the discharge temperature detection sensor 17 continues to be lower than the comparison discharge temperature for a predetermined time. Therefore, for example, when the discharge temperature falls momentarily below the comparative discharge temperature due to, for example, a change in the operating state of the refrigeration apparatus 100, such as switching the rotational speed of the compressor 11, It is possible to prevent an abnormality from being detected.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 3 shows a refrigeration apparatus 200 according to the second embodiment. The refrigeration apparatus 200 according to the second embodiment is substantially the same as the refrigeration apparatus 100 according to the first embodiment except that the refrigeration apparatus 200 includes an outside air temperature detection sensor 101 (an outside air temperature detection unit) that detects the outside air temperature of the refrigerator unit 10. It has the same configuration. In FIG. 3, about the structure similar to 1st embodiment, the code | symbol same as 1st embodiment is attached | subjected and description is abbreviate | omitted. In the refrigeration apparatus 200 according to the second embodiment, the suction temperature detection sensor 15 and the discharge pressure detection sensor 18 included in the refrigeration apparatus 100 according to the first embodiment are not essential components.

  The control device 19 according to the first embodiment obtains a theoretical value of the discharge temperature based on the suction temperature, the suction pressure, and the discharge pressure by using the discharge temperature theoretical value calculation formula (1), and determines a predetermined value from this theoretical value. Although the configuration in which the value obtained by subtracting the value is obtained as the comparison discharge temperature, the control device 102 according to the second embodiment obtains the comparison discharge temperature based on the suction pressure of the compressor 11 and the outside air temperature. It is said. At this time, the comparison discharge temperature correspondence table shown in FIG. 4 is stored in the ROM of the control device 102.

The comparison discharge temperature correspondence table shown in FIG. 4 associates the discharge temperature for comparison with the outside air temperature and the suction pressure of the refrigerant sucked into the compressor 11 in advance, and the controller 102 detects an abnormality. When the process is executed, a comparison discharge temperature corresponding to the outside air temperature detected by the outside air temperature detection sensor 101 and the suction pressure detected by the suction pressure detection sensor 16 is read out. For example, the outside air temperature detected by the outside air temperature detection sensor 101 is a T _a, the intake pressure detected by the suction pressure sensor 16 is the case of P _a, CT _aa is read as a comparative discharge temperature. Similarly, the outside air temperature is a T _a, the suction pressure is the case of P _b, CT _ba is read as a comparative discharge temperature. Here, the outside air temperature is detected because the discharge pressure is easily influenced by the temperature of the outside air blown to the outdoor heat exchanger 13, so that the comparison is easily made based on the relationship between the outside air temperature and the discharge pressure. This is because the discharge temperature is obtained.

Hereinafter, the abnormality detection process as the operation of the second embodiment executed under the control of the control device 102 will be described with reference to FIG.
First, the control device 102 detects the outside air temperature of the refrigerator unit 10 and the suction pressure of the refrigerant sucked into the compressor 11 by the outside air temperature detection sensor 101 and the suction pressure detection sensor 16 (step S11). At the same time, the discharge temperature detection sensor 17 detects the discharge temperature of the refrigerant discharged from the compressor 11 (step S11).

  Next, the control device 102 reads the comparison discharge temperature associated with the outside air temperature and the suction pressure detected in step S11 from the comparison discharge temperature correspondence table shown in FIG. 4 (step S12). Next, the comparison discharge temperature read in step S12 and the detected discharge temperature detected in step S11 are compared to determine whether or not the detected discharge temperature is lower than the comparison discharge temperature (step S13). ). If it is determined in step S13 that the detected discharge temperature is equal to or higher than the comparative discharge temperature (step S13: N), the process returns to step S11. On the other hand, if it is determined in step S13 that the detection discharge temperature is lower than the comparison discharge temperature (step S13: Y), whether or not this state continues for a predetermined time (30 minutes in the illustrated example). A determination is made (step S14). When it is determined that the detection discharge temperature is lower than the comparison discharge temperature for a predetermined time (step S14: Y), the control device 102 indicates that the discharge temperature of the compressor 11 is abnormally decreased. And the control device 102 outputs a control signal to the abnormality notification device 30 to notify the abnormality notification device 30 of an abnormal drop in the discharge temperature (step S15).

  According to the second embodiment described above, the control device 102 reduces the discharge temperature abnormally based on the suction pressure and the outside temperature detected by the suction pressure detection sensor 16 and the outside temperature detection sensor 101, respectively. A comparative discharge temperature for detection is obtained. Then, the abnormality detection sensor compares the discharge temperature for comparison thus obtained with the discharge temperature of the compressor 11 actually detected by the discharge temperature detection sensor 17, and compares the compressor 11 with the discharge temperature for comparison. Since the abnormality is detected when the actual discharge temperature is lower, an abnormal drop in the refrigerant discharge temperature in the refrigeration apparatus 100 can be detected.

  At this time, the control device 102 has a comparison discharge temperature correspondence table in which the comparison discharge temperature is previously associated with the outside air temperature of the refrigerator unit 10 and the suction pressure of the refrigerant sucked into the compressor 11. The comparison discharge temperature is obtained by reading out the comparison discharge temperature corresponding to the outside air temperature detected by the outside air temperature detection sensor 101 and the suction pressure detected by the suction pressure detection sensor 16. The discharge temperature for use can be easily obtained.

The present invention is not limited to the first embodiment and the second embodiment described above, and it is needless to say that changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the first embodiment and the second embodiment, as an example of the refrigeration apparatuses 100 and 200 including the refrigeration cycle including the compressor 11, a plurality of shows are performed for one refrigeration unit 10. Although the case 20 connected to the case 20 has been described as an example, the refrigeration apparatus of the present invention may be realized as, for example, an air conditioner, and is conditioned air to the room instead of the showcase 20. You may comprise as an indoor unit which ventilates.
Moreover, in the said embodiment, although it was set as the structure which performs abnormality detection processing in the control apparatuses 19 and 102 with which the refrigerator unit 10 is provided, for example, the refrigerator unit 10 and each showcase 20 are controlled by a central controller or the like. In the central control device, the suction pressure, suction temperature and discharge pressure or outside air temperature of the compressor 11 and the discharge temperature of the compressor 11 transmitted from the control devices 19 and 102 of the refrigerator unit 10 in the central control device Based on the above, it is possible to obtain a comparative discharge temperature and perform an abnormality detection process. For example, when a refrigeration system in which a plurality of showcases 20 are connected to a plurality of refrigerator units 10 is managed by the central control device, an abnormality of each refrigerator unit 10 on the central control device side. Can be detected.

It is a schematic diagram which shows the freezing apparatus of 1st embodiment of this invention. It is a flowchart which shows operation | movement of 1st embodiment. It is a schematic diagram which shows the freezing apparatus of 2nd embodiment of this invention. It is explanatory drawing which shows the temperature correlation table for a comparison which a control apparatus has. It is a flowchart which shows operation | movement of 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Refrigerator unit 11 Compressor 12 Outdoor refrigerant piping 13 Outdoor heat exchanger 14 Liquid receiver 15 Suction temperature detection sensor (suction temperature detection part)
16 Suction pressure detection sensor (suction pressure detector)
17 Discharge temperature detection sensor (Discharge temperature detector)
18 Discharge pressure sensor (Discharge pressure detector)
19 Control device (comparison discharge temperature calculation unit, abnormality detection unit)
DESCRIPTION OF SYMBOLS 20 Showcase 21 Indoor heat exchanger 22 Expansion valve 23 Indoor refrigerant | coolant piping 30 Abnormality notification apparatus 100 Refrigeration apparatus 101 Outside temperature detection sensor (outside temperature detection part)
102 Control device 200 Refrigeration device

Claims (8)

An abnormality detection device for detecting an abnormality of a refrigeration apparatus having a refrigeration cycle including a compressor,
A discharge temperature detector for detecting the discharge temperature of the compressor;
A discharge pressure detector for detecting the discharge pressure of the compressor;
An intake temperature detector for detecting an intake temperature of the compressor;
A suction pressure detector for detecting the suction pressure of the compressor;
A comparison discharge temperature calculation unit for obtaining a comparison discharge temperature based on the discharge pressure, the suction temperature and the suction pressure respectively detected by each detection unit;
An abnormality detection unit for detecting that the discharge temperature is abnormal when the discharge temperature detected by the discharge temperature detection unit is lower than the comparison discharge temperature obtained by the comparison discharge temperature calculation unit; ,
An abnormality detection device characterized by comprising: The abnormality detection device according to claim 1,
The comparison discharge temperature calculation unit obtains a theoretical value of the discharge temperature of the compressor based on the discharge pressure, the suction temperature, and the suction pressure using a predetermined relational expression, and subtracts the predetermined value from the theoretical value. The above-mentioned value as the comparative discharge temperature,
An abnormality detection device characterized by the above. An abnormality detection device for detecting an abnormality of a refrigeration apparatus having a refrigeration cycle including a compressor,
A discharge temperature detector for detecting the discharge temperature of the compressor;
A suction pressure detector for detecting the suction pressure of the compressor;
An outside temperature detector for detecting the outside temperature;
A comparison discharge temperature calculation unit for obtaining a comparison discharge temperature based on the suction pressure and the outside air temperature respectively detected by each detection unit;
An abnormality detection unit for detecting that the discharge temperature is abnormal when the discharge temperature detected by the discharge temperature detection unit is lower than the comparison discharge temperature obtained by the comparison discharge temperature calculation unit; ,
An abnormality detection device characterized by comprising: In the abnormality detection device according to claim 3,
The comparison discharge temperature calculation unit has a comparison discharge temperature correspondence table in which a comparison discharge temperature is previously associated with an outside air temperature and a suction pressure of the refrigerant, and is detected by the outside air temperature detection unit. Reading out the comparison discharge temperature corresponding to the outside air temperature and the suction pressure detected by the suction pressure detector, and setting it as the comparison discharge temperature;
An abnormality detection device characterized by the above. In the abnormality detection apparatus as described in any one of Claims 1-4,
The abnormality detection unit, when the discharge temperature of the refrigerant detected by the discharge temperature detection unit is continuously lower than the comparison discharge temperature obtained by the comparison discharge temperature calculation unit for a predetermined time, Detecting that the discharge temperature is abnormal;
An abnormality detection device characterized by the above. In the abnormality detection apparatus according to any one of claims 1 to 5,
When the abnormality detection unit detects that there is an abnormality in the discharge temperature, the abnormality detection unit includes an abnormality notification unit that notifies the abnormality.
An abnormality detection device characterized by the above. A refrigeration cycle including a compressor, a discharge temperature detection unit that detects a discharge temperature of the compressor, a discharge pressure detection unit that detects a discharge pressure of the compressor, and an intake temperature that detects an intake temperature of the compressor An abnormality detection method for detecting an abnormality of a refrigeration apparatus including a detection unit and an intake pressure detection unit for detecting an intake pressure of the compressor,
A process of detecting the discharge temperature of the compressor by the discharge temperature detector;
Detecting the discharge pressure of the compressor by the discharge pressure detector;
A process of detecting the intake temperature of the compressor by the intake temperature detector;
Detecting the suction pressure of the compressor by the suction pressure detection unit;
A process of obtaining a discharge temperature for comparison based on the discharge pressure, the suction temperature and the suction pressure respectively detected by each detection unit;
A process of detecting that the discharge temperature is abnormal when the discharge temperature detected by the discharge temperature detector is lower than the comparison discharge temperature;
An abnormality detection method comprising: A refrigeration cycle including a compressor, a discharge temperature detection unit that detects a discharge temperature of the compressor, a discharge pressure detection unit that detects a discharge pressure of the compressor, and an intake temperature that detects an intake temperature of the compressor A control program for controlling, using a computer, an abnormality detection device that detects an abnormality of a refrigeration apparatus including a detection unit and an intake pressure detection unit that detects an intake pressure of the compressor,
The discharge temperature detection unit detects the discharge temperature of the compressor,
The discharge pressure detector detects the discharge pressure of the compressor,
The suction temperature detection unit detects the suction temperature of the compressor,
The suction pressure detection unit detects the suction pressure of the compressor,
A discharge temperature for comparison is obtained based on the discharge pressure, the suction temperature and the suction pressure respectively detected by each detection unit;
Detecting that the discharge temperature is abnormal when the discharge temperature detected by the discharge temperature detection unit is lower than the comparison discharge temperature;
A control program characterized by

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