JP2000283639A - Method for warning refrigerator for cooling deep freezing and cold storage showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fault by measuring an operating state of a refrigerator, comparing the measured data with set data previously set in a centralized control device, predicting a fault of the refrigerator, and generating a fault predicting alarm. SOLUTION: A plurality of refrigerator measuring controllers 4a to 4c input measured data of a refrigerant liquid temperature, a suction temperature, a discharge temperature, a high pressure, a low pressure and start or stop state of the refrigerator to be measured by the temperature sensor, a refrigerant input/output unit and a gas pressure sensor installed in a plurality of refrigerators 5a to 5c, and output the measured data to a untralized control device 1 through a communicating transmission line 6 at each one minute according to a request from the device 1. The measured data are calculated by a formula for calculating a saturated temperature preset in the device 1, compared with set data item as a reference for conducting a prior alarm. Thus, if the data exceeds the set value, it is judged that the data is abnormal, and a fault predicting alarm is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for alarming a refrigerator for freezing a refrigerated showcase installed in a store such as a supermarket.

[0002]

2. Description of the Related Art In a store such as a supermarket, a plurality of freezing and refrigerated showcases are installed, a refrigerator is connected to these showcases to cool the inside of the showcase, and the frozen and refrigerated products in the refrigerator are kept cool. ing. Such refrigerated products need to be frozen, and if the cooling function is impaired and the cooling function is impaired, the quality will be reduced. In the event of a failure, a warning is issued promptly to indicate the occurrence of an abnormality in order to minimize damage to the product. There is a need to.

FIG. 3 shows a conventional example of such an alarm system, in which a refrigerator 5a connected to a refrigerated showcase is provided.
Is connected to the centralized control device 1 via the communication transmission line 6, and the refrigerator abnormality notification unit 11 is connected to the refrigerator abnormality input unit 10 of the control circuit provided in the system. Operation data such as a refrigerant temperature and a refrigerant pressure from, for example, a temperature sensor or a pressure sensor installed in the refrigerator 5a is input to the machine abnormality input unit 10.

When the control circuit determines that an abnormality has occurred based on operation data from a temperature sensor, a pressure sensor, or the like installed in the refrigerator 5a, the refrigerator abnormality input unit 10 sends an abnormality to the refrigerator abnormality notification device 11. When the occurrence is input, the occurrence of the abnormality is notified to the central control device 1, and the occurrence of the abnormality is dealt with, for example, by closing the solenoid valve of the refrigerated showcase connected to the refrigerator to prevent liquid back. are doing.

[0005]

In such a warning method, the notification of the abnormality of the refrigerator is made after the abnormality has occurred in the refrigerator. For this reason, until the occurrence of the abnormality is dealt with, the refrigerator is operated in an abnormal state even for a short time, which may adversely affect the refrigerated products required in the refrigerated showcase. is there.

SUMMARY OF THE INVENTION An object of the present invention is to solve the disadvantages of the prior art and detect and report an abnormality in a refrigerator before it occurs, thereby preventing a failure or an abnormal state from continuing for a long time. It is another object of the present invention to provide an alarm method for a refrigerator for a freezer and refrigerated showcase, which can maintain the quality of the product by preventing adverse effects on the frozen or refrigerated product in the refrigerator.

[0007]

According to the present invention, in order to achieve the above object, first, the operation state of a refrigerator is measured by a measurement control device, and the measurement data is set in a central management device in advance. Since the abnormality of the refrigerator is predicted by comparing it with the data and the abnormality prediction warning is issued, the abnormality can be predicted at a stage before the abnormality occurs and can be dealt with in advance. Therefore,
It is not possible to operate in an abnormal state, and it is possible to prevent the quality of the frozen / refrigerated products in the refrigerator from deteriorating.

Second, the measurement data items predict the occurrence of abnormality by adopting the refrigerant liquid temperature, suction temperature, discharge temperature, high pressure, low pressure and the start / stop state of the refrigerator. Since various kinds of detailed data can be adopted as measurement data for the measurement, accurate prediction can be performed based on this data.

Third, by adopting the same items as the measurement data items, the refrigerant discharge superheat, the refrigerant superheat and the subcool, the setting data items are compared with each other, so that the measurement data items are often compared. Since detailed types of data can be adopted, accurate prediction can be made based on this data.

Fourth, the prediction of the abnormality of the refrigerator can be accurately determined by using a value calculated by a preset calculation formula relating to the refrigerant.

Fifth, the abnormality prediction of the refrigerator can be performed by connecting the central control device to a remote control device via a public telephone line to enable detection at a remote location.
For example, a maintenance company or a service company that is away from the store can also make an abnormality prediction judgment, and can promptly deal with the occurrence of an abnormal situation before it occurs, thereby preventing the occurrence of an abnormal situation.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of an alarm method of a refrigerator for cooling a refrigerator-freezer showcase according to the present invention. The devices 4a, 4b, 4c are connected. The refrigerator measurement control devices 4a, 4b, 4c utilize microcomputers or the like, and as shown in FIG.
5c, a low-pressure and high-pressure gas pressure sensor 9 for measuring the pressure of the refrigerant, temperature sensors 7 for measuring the liquid temperature of the refrigerant, the suction temperature to the refrigerator, and the discharge temperature, and detects the start / stop state of the refrigerator. The refrigerator start / stop input unit 8 and the like are connected.

The refrigerator measurement control devices 4a, 4b, 4
c and the showcase controllers 3a, 3b, 3c attached to the freezer and refrigerated showcases are connected to the central control device 1 via a two-wire communication transmission line 6. In the figure, reference numeral 2 denotes a controller power supply unit.

The centralized control device 1 utilizes a computer or the like, and includes, as measurement data items, the temperature sensor 7, the refrigerator start / stop input unit 8, and the refrigerant liquid temperature of the refrigerator measured by the gas pressure sensor 9. Set the suction temperature, discharge temperature, high pressure, low pressure, and start / stop state of the refrigerator. In addition to the above measurement data items, the setting data items for comparing the measurement data include discharge superheat of refrigerant, suction Superheat and subcool are set in advance.
Here, the discharge superheat indicates the difference between the saturated vapor temperature of the refrigerant at the outlet pipe side of the refrigerator and the steam temperature at that time, and the suction superheat indicates the difference at the inlet pipe side of the refrigerator. The difference between the saturated steam temperature of the refrigerant and the steam temperature at that time is shown. The subcool indicates the difference between the saturated liquid temperature of the refrigerant and the liquid temperature at that time.

Further, a formula for calculating the saturation temperature based on the measurement data is set in the central control device 1 in advance. This calculation formula is represented by the following fifth-order polynomial of the gas pressure. ET = A + BP + CP ² + DP ³ + EP ⁴ + FP ⁵ where ET is the refrigerant evaporation temperature, P is the gas pressure (low pressure), and A, B, C, D, E, and F are constants.

Further, the centralized management device 1 is connected via a public telephone line 13 to a management device 12 using a computer having a centralized management function installed at a remote maintenance company or service company.

Next, the operation will be described. In the refrigerator measurement control devices 4a to 4c, the temperature sensor 7, the refrigerator start / stop input unit 8, and the refrigerant liquid temperature, suction temperature, and discharge temperature of the refrigerator measured by the gas pressure sensor 9 installed in the refrigerators 5a to 5c. In response to a request from the centralized control device 1, for example, the high-pressure pressure, the low-pressure pressure, and the start / stop state of the refrigerator are fetched, and the measured data is transmitted via the communication transmission line 6 every minute. Output to

The measurement data taken into the central control device 1 is calculated by a formula for calculating the saturation temperature preset in the central control device 1, and is set in advance as a setting data item serving as a reference for performing an advance warning. It is compared with the same measurement data items as set, and with the set values of the refrigerant superheat, suction superheat and subcool, and if the comparison results in exceeding the set values, it is judged that an abnormality may occur. Thus, an alarm is output from the central management device 1 as a message such as a sound of a buzzer or a character display.

As described above, when it is determined that there is a possibility of occurrence of an abnormality before the occurrence of the abnormality, it is possible to cope with the occurrence of the failure by predicting the abnormality before the failure.

If the central control device 1 is connected to the remote control device 12 via the public telephone line 13, the measurement data and the setting data can be transmitted. Can quickly deal with repairs.

[0021]

As described above, the alarm method of the refrigerator for freezing and refrigerated showcase cooling according to the present invention firstly measures the operation state of the refrigerator by a measurement control device, and collects the measured data into a centralized management device. Since the abnormality of the refrigerator is predicted by comparing with the setting data set in advance and an abnormality prediction alarm is issued, the abnormality can be predicted at a stage before the abnormality occurs and can be dealt with in advance. Therefore, it is not possible to operate in an abnormal state, and it is possible to prevent a decrease in the quality of the frozen / refrigerated products in the refrigerator.

Second, the measurement data items predict the occurrence of abnormalities by employing the refrigerant liquid temperature, suction temperature, discharge temperature, high pressure, low pressure, and start / stop state of the refrigerator. Since various kinds of detailed data can be adopted as measurement data for the measurement, accurate prediction can be performed based on this data.

Third, by adopting the same items as the measurement data items, refrigerant superheat, suction superheat, and subcool, the setting data items are compared with each other, so that there are many setting data items to be compared with the measurement data items. Since detailed types of data can be adopted, accurate prediction can be made based on this data.

Fourth, the prediction of the abnormality of the refrigerator can be accurately determined by using a value calculated by a preset calculation formula relating to the refrigerant.

Fifth, the abnormality prediction of the refrigerator can be performed by connecting the centralized management device to a management device at a remote place via a public telephone line, thereby enabling detection at a remote location.
For example, a maintenance company or a service company that is away from the store can also make an abnormality prediction judgment, and can promptly deal with the occurrence of an abnormal situation before it occurs, thereby preventing the occurrence of an abnormal situation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a refrigerator alarm method according to the present invention.

FIG. 2 is an explanatory diagram of a connection between the refrigerator and the refrigerator measurement control device, which is a main part of the embodiment of the refrigerator alarm method of the present invention.

FIG. 3 is an explanatory diagram of a connection between a refrigerator and a refrigerator, showing a conventional refrigerator warning method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Central management apparatus, 2 ... Power supply unit for controllers, 3a, 3b, 3c ... Showcase controller,
4a, 4b, 4c ... refrigerator measurement control device, 5a, 5b,
5c: refrigerator, 6: communication transmission line, 7: temperature sensor, 8: refrigerator start / stop input unit, 9: gas pressure sensor,
10 Refrigerator abnormality input unit, 11 Refrigerator abnormality notification device, 12 Management device, 13 Public telephone line

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Claims (5)

[Claims] 1. An operation state of a refrigerator is measured by a measurement control device, and the measured data is compared with set data preset in a central control device to predict a refrigerator abnormality, and an abnormality prediction alarm is issued. A warning method for a refrigerator for cooling a refrigerated showcase, comprising: 2. The apparatus according to claim 1, wherein the items of the measurement data include a refrigerant liquid temperature, a suction temperature, a discharge temperature, a high pressure, a low pressure, and a start / stop state of the refrigerator.
An alarm method for the refrigerator for cooling a refrigerated showcase described in the above. 3. The item of the setting data according to claim 1, wherein the item of the setting data adopts the same item as the measurement data item, refrigerant discharge superheat, suction superheat and subcool. Alarm method for refrigerators for cooling refrigerated showcases. 4. The refrigeration showcase cooling system according to claim 1, wherein the abnormality prediction of the refrigerator uses a value calculated by a preset calculation formula regarding the refrigerant. Alarm method for refrigerators. 5. An apparatus for predicting an abnormality of a refrigerator according to claim 1, wherein the abnormality can be detected at a remote location by connecting the centralized management device to a remote management device via a public telephone line. The alarm method for a refrigerator for cooling a refrigerated showcase according to any one of claims 1 to 4.