TW201925704A - Management system of refrigerating device characterized by giving a notification by early and accurately determining the occurrence of a clogged condenser - Google Patents

Abstract

The present invention provides a management system of a refrigerating device, which can give a notification by early and accurately determining the occurrence of a clogged condenser. The present invention manages the refrigerating device (R) that allows the sucked external air to vent toward the condenser (5) by the aid of the condenser blower (15), and is equipped with: the discharging temperature sensor used to detect the refrigerant discharging temperature Td of the compressor (3), the external air temperature sensor used to detect external air temperature, and the main controller (11). On the basis of the refrigerant discharging temperature of the compressor exceeding the predetermined threshold STh, the main controller can determine to have an occurrence of a clogged condenser so as to execute a predetermined notification action and change the threshold STh on the basis of the external air temperature.

Description

Freezing unit management system

The present invention relates to a system for managing a refrigeration system including a blower for a compressor, a condenser, and a condenser.

In the past, in a store such as a convenience store, there are a plurality of display cases (shopping appliances), and sandwiches, rice balls, lunches, noodles, non-staple foods, desserts, and other beverages such as water, tea, and juice (refrigerated products). Ice cream, frozen foods, etc. (frozen goods) are displayed while being cooled. In this case, the evaporator of each showcase (referred to as a separate display case) and the compressor and the condenser of the refrigerator installed outside the store constitute a refrigerant circuit of the refrigeration system, and are configured to be compressed by the condenser. After the refrigerant discharged from the machine is condensed, the supply is distributed to the evaporators of the showcases (for example, refer to Patent Document 1).

In this case, the condenser provided in the refrigerator ventilates the outside air via the condenser filter by the condenser blower, thereby condensing the refrigerant, but the outside air contains dust, so that the condenser itself and the condenser filter are blocked. The condenser is clogged. When the clogging of the condenser occurs, the ventilation performance is deteriorated, so that the heat exchange efficiency between the refrigerant and the outside air is lowered, the power consumption is increased, and if it is left as it is, the cooling capacity in the display chamber is lowered, and the product is deteriorated.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2001-272149.

Here, when the condenser is clogged, the refrigerant discharge temperature of the compressor and the refrigerant discharge increase the pressure. Therefore, it is considered that the refrigerant discharge temperature and the refrigerant discharge pressure are compared with a predetermined threshold value to determine the occurrence of the condenser clogging, and the notification is made to supervise the maintenance. However, the refrigerant discharge temperature and the refrigerant discharge pressure of the compressor are generally compared with the external gas temperature. It tends to become low in a low environment and become high in an environment where the outside air temperature is high. Therefore, when the condenser clogging is judged with a fixed threshold value, for example, in a situation where the temperature of the outside air such as winter is low, it is not known that the condenser clogging has occurred, and it is only in the summer that the problem is caused to cause the product to deteriorate.

The present invention has been made to solve the above conventional problems, and an object of the invention is to provide a management system for a refrigeration system that can notify an early and accurate determination of occurrence of a clogging of a condenser.

In the management system of the refrigeration system according to the first aspect of the invention, the refrigeration system includes a compressor, a condenser, and a condenser air blower, and the condenser external air is ventilated to the condenser by the air blower. a discharge temperature sensor for a refrigerant discharge temperature of the compressor, an external gas temperature sensor for detecting an outside air temperature, and a control device that determines that a condenser blockage occurs based on a refrigerant discharge temperature of the compressor exceeding a predetermined threshold value STh The predetermined notification action is performed, and the threshold STh is changed based on the outside air temperature.

According to a second aspect of the invention, in the management system of the refrigeration system of the invention, the discharge pressure sensor for detecting a refrigerant discharge pressure of the compressor is provided, and the control device exceeds the threshold value STh based on the refrigerant discharge temperature of the compressor. The refrigerant discharge pressure of the compressor exceeds a predetermined threshold value SPh, it is determined that the condenser clogging has occurred, the notification operation is performed, and the threshold value STh and the threshold value SPh are changed based on the outside air temperature.

In the management system of the refrigeration system according to the third aspect of the invention, the refrigeration system includes a compressor, a condenser, and a condenser blower, and the condenser external air is ventilated to the condenser by the condenser, and is characterized in that the refrigerant is provided. a discharge pressure sensor for a refrigerant discharge pressure of the compressor, an external gas temperature sensor for detecting an outside air temperature, and a control device that determines that a condenser blockage occurs based on a refrigerant discharge pressure of the compressor exceeding a predetermined threshold value SPh The predetermined notification action is performed, and the threshold SPh is changed based on the outside air temperature.

In the above-described respective inventions, the control device is characterized in that the control device changes the threshold value STh and/or the threshold value SPh in a direction in which the external air temperature is higher.

In the above-described respective inventions, the control device according to the invention of the fifth aspect of the invention is characterized in that the control device changes the threshold value STh and/or the threshold value SPh to a higher level in accordance with the temperature of the outside air.

According to a sixth aspect of the invention, in the management system of the invention, the control device divides the outside air temperature into a plurality of temperature intervals, and changes the threshold value STh and/or by a slope of a linear function for each temperature interval. The degree to which the threshold SPh becomes high. Effect of the invention

According to the invention of claim 1 or 3, in the system for managing a refrigeration system including a blower for a compressor, a condenser, and a condenser and ventilating the sucked outside air to the condenser via the condenser blower, the compressor is provided. a discharge temperature sensor for a refrigerant discharge temperature or a discharge pressure sensor for detecting a refrigerant discharge pressure of the compressor, an external gas temperature sensor for detecting an external gas temperature, and a control device based on a refrigerant discharge temperature of the compressor or When the refrigerant discharge pressure exceeds the predetermined threshold value STh or the threshold value SPh, it is determined that the condenser clogging has occurred, the predetermined notification operation is performed, and the threshold value STh or the threshold value SPh is changed based on the outside air temperature. Therefore, for example, in the invention of the fourth aspect, with the control device, The higher the temperature of the outside air, the more the threshold value STh and/or the threshold value SPh are changed in the direction in which the temperature increases, whereby the threshold values STh and SPh can be lowered in an environment where the outside air temperature is low, and the threshold value STh can be raised in an environment where the outside air temperature is high. , SPh.

Therefore, even if the temperature of the outside air changes due to the season or the like, it is possible to determine whether or not the condenser clogging has occurred in the early stage and accurately, and it is possible to urge maintenance, and it is possible to prevent an increase in power consumption and deterioration of the display product.

Further, in the control device according to the second aspect of the invention, when the refrigerant discharge temperature of the compressor exceeds the threshold value STh and the refrigerant discharge pressure of the compressor exceeds the predetermined threshold value SPh, it is determined that the condenser clogging has occurred, the notification operation is performed, and the external operation is performed. The gas temperature change threshold value STh and the threshold value SPh can more accurately determine the occurrence of condenser clogging.

Here, the tendency of the refrigerant discharge temperature and the refrigerant discharge pressure of the compressor to be high is different depending on the temperature of the outside air. Therefore, the control device according to the invention of claim 5 changes the threshold value STh and the threshold value SPh in accordance with the temperature of the outside air. To a high degree, it is possible to more accurately determine whether or not a condenser clogging has occurred.

In this case, the control device according to the invention of the sixth aspect can divide the outside air temperature into a plurality of temperature sections, and can change the threshold value STh and the threshold value SPh by the slope of the linear function for each temperature section. It is easier to determine the job or the like for the set value of the control.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Embodiment 1 FIG. 1 shows a piping structure including a communication circuit of a management system 1 to which a refrigeration system R according to an embodiment of the present invention is applied, and a refrigeration system R.

(1) Refrigeration device R In FIG. 1, the refrigeration system R of the embodiment is installed outside the store, for example, by a plurality of display cases (equipment) 2 installed in the store interior wall of a store such as a convenience store, and the like. The refrigerator 4 (equipment) is composed of. Each of the showcases 2 includes an evaporator 6, an expansion valve (electronic expansion valve) 7, and a cooling air blower (not shown), and the refrigerator 4 is provided with a condenser 5 and a condenser in addition to the compressor 3. The device 10, the blower 15 for the condenser, and the like. Further, in the embodiment, the single compressor 3 is shown, but the compressor 3 of the refrigerator 4 of Fig. 1 may be constituted by a plurality of compressors.

In this case, the condenser 5 is connected to the discharge pipe of the compressor 3 of the refrigerator 4, and the high pressure pipe (refrigerant pipe) 8 is connected to the condenser 5. Further, the condenser filter 10 is disposed on the air inflow side of the condenser 5, and is configured such that when the condenser blower 15 is operated, the external air is sucked by the condenser 5 via the condenser filter 10 by the condenser blower 15. And ventilation.

On the other hand, each of the showcases 2 is a so-called stand-alone display case, and the inlets of the evaporators 6 of the showcases 2 are connected in parallel to the high-pressure pipes (refrigerant pipes) 8 via the expansion valve 7, and the outlets of the evaporators 6 are respectively connected. The low pressure pipe (refrigerant pipe) 9 is connected to the suction pipe of the compressor 3. The high-pressure pipe 8 and the low-pressure pipe 9 are disposed from the refrigerator 4 installed outside the store to the display cases 2 installed in the store, and constitute the refrigerant circuit RC of the refrigeration system R.

Then, the high-temperature high-pressure refrigerant (for example, R404a or the like) discharged from the compressor 3 flows into the condenser 5, and is condensed by air-cooling of the outside air ventilated from the condenser blower 15. The refrigerant that has flowed out of the condenser 5 comes out of the refrigerator 4 and enters the high-pressure pipe 8, and is distributed to the display cases 2 via the high-pressure pipe 8. The refrigerant that has been supplied and supplied from the same compressor 3 to each of the showcases 2 is concentrated by the respective expansion valves 7, and then flows into the evaporator 6 to be evaporated. By the endothermic action at this time, the air circulated by the blower for cooling air circulation is cooled, and the cooled cold air is circulated in the reservoir, whereby the interior of each showcase 2 is cooled. The refrigerant evaporated by the evaporator 6 is thereafter repeatedly subjected to a cycle of entering the refrigerator 4 via the low pressure pipe 9 and being sucked by the compressor 3.

(2) The junction box controller 12 Each of the showcases 2 constituting the refrigeration system R is provided with a connection box controller 12 (device controller) constituted by a microcomputer as an example of a computer having a processor. The control of the present invention is constituted. Part of the device). FIG. 2 shows a functional block diagram of the junction box controller 12. The connection box controller 12 is composed of a control unit 21, a storage unit 22, a signal input unit 23, a display unit 24, an input unit 26, a device drive unit 27, and a communication unit 28. The control unit 21 manages the expansion valve 7 of the showcase 2. The operation control of the blower for cooling air circulation and the communication control with the main controller 11 to be described later, the storage unit 22 stores various kinds of information (data), and the signal input unit 23 is connected to the temperature sensor 25 for detecting the temperature in the library or the like. The display unit 24 displays various materials and the like, the input unit 26 performs setting switching, and the device driving unit 27 drives the respective devices, and the communication unit 28 performs information via a main controller 11 to be described later and a communication line 14 to be described later ( Receiving transmission of data).

The control unit 21 of each of the junction box controllers 12 receives the instruction information (operation instruction data) transmitted from the main controller 11 to the display case 2, which will be described later, via the communication unit 28, based on the received instruction information (set temperature) and detection. The output of the temperature sensor 25 of the own internal temperature is controlled by the device drive unit 27 to control the valve opening degree of the expansion valve 7 and the operation of the above-described cooling air circulation blower.

In this case, the showcase 2 is a shop appliance that displays and sells a product such as a lunch, a noodle, a non-staple food, a dessert, an ice cream, and the like, and the control unit 21 of the junction box controller 12 of the showcase 2 is fully closed to the upper limit of control. The valve opening degree of the expansion valve 7 is controlled by the device driving unit 27 between the opening degrees to control the operation of the cooling air circulation blower so that the temperature in the interior is set to each set temperature (instruction information).

(3) Refrigerator controller 13 In addition, the refrigerator 4 is also provided with a refrigerator controller 13 (device controller which constitutes a control device of the present invention) including a microcomputer as an example of a computer having a processor. . The configuration of the refrigerator controller 13 is basically the same as that of FIG. 2. However, the signal input unit 23 is connected to a discharge temperature sensor 30 (mounted to the discharge pipe) that detects the refrigerant discharge temperature Td of the compressor 3, and detects the compressor. The discharge pressure sensor 35 of the refrigerant discharge pressure of 3, the low pressure sensor 40, and the like, and the device driven by the device drive unit 27 are the compressor 3 and the like.

The control unit 21 of the refrigerator controller 13 receives the instruction information (operation instruction data) from the main controller 11 to be described later via the communication unit 28 to the refrigerator controller 13, based on the instruction information (low pressure pressure setting value) and The output of the low pressure sensor 40 that detects the low pressure of the refrigerant circuit RC from the low pressure pipe 9 to the suction side of the compressor 3 is controlled by the device drive unit 27 to control the number of revolutions (operating frequency Hz) of the compressor 3.

In this case, the control unit 21 of the refrigerator controller 13 is based on the low pressure pressure set value (information information) transmitted from the main controller 11 and the low pressure pressure (actual measured value) detected by the pressure sensor 40, at a low pressure ratio and a low pressure ratio. When the pressure setting value is high, the operation of the compressor 3 is controlled by the device drive unit 27 in a direction in which the number of revolutions (operating frequency Hz) of the compressor 3 rises, and the compressor is operated when the low pressure is lower than the low pressure set value. The direction in which the rotational speed (operating frequency Hz) of 3 is decreased controls the operation of the compressor 3, thereby controlling the low-pressure pressure to the low-pressure pressure setting value, and in the case where all the expansion valves 7 of the showcase 2 are fully closed, the device driving portion 27 is stopped. Compressor 3.

Further, the refrigerant discharge temperature Td, the refrigerant discharge pressure Pd, and the rotation speed (Hz) of the compressor 3 detected by the discharge temperature sensor 30 of the refrigerator controller 13 and the discharge pressure sensor 35 are configured by means of control. The unit 21 transmits to the main controller 11 via the communication unit 28 and the communication line 14.

(4) Main controller 11 The main controller 11 is a centralized control device called a store manager (which also constitutes a part of the control device of the present invention) installed in a management room of a store or the like, and is provided with processing. It is composed of a microcomputer of an example of a computer. FIG. 4 shows a functional block diagram of the main controller 11. The main controller 11 is composed of a control unit 31, a storage unit 32, a signal input unit 33, a display unit 34, an input unit 36, an output unit 37, a data unit 38, a communication unit 39, and a wireless communication unit 42, and the control unit 31 manages Control and communication control of each device, the storage unit 32 stores various kinds of information (data), and the signal input unit 33 is connected to an external air temperature sensor 45 that detects an outside air temperature (temperature outside the store), and the display unit 34 is displayed. A color liquid crystal display or the like of various materials, the input unit 36 is constituted by a push switch or the like, the output unit 37 is constituted by a buzzer or the like, and the data unit 38 receives and transmits data via an internet circuit, and the communication unit 39 The connection box controller 12 and the refrigerator controller 13 receive and transmit information (data) via the communication line 14, and the wireless communication unit 42 transmits the data to a tablet terminal (mobile terminal device) 41, which will be described later, via the wireless area network. Wireless communication.

Further, the communication unit 28 of each of the junction box controllers 12 and the communication unit 28 of the refrigerator controller 13 are connected to the communication unit 39 of the main controller 11 via the communication line 14, via the communication line 14 at the main controller 11 and the respective connections. Reception and transmission of information (data) between the cartridge controllers 12 and between the main controller 11 and the refrigerator controller 13. The main controller 11, the connection box controller 12, and the refrigerator controller 13 are used to construct a centralized management system for the store connected by the communication line 14, and the controllers 11, 12, and 13, and the tablet terminal 41, which will be described later, are configured. The control device of the management system 1 of the freezing device R of this embodiment.

In this case, the control unit 31 of the main controller 11 recognizes each of the junction box controller 12 and the refrigerator controller 13 by using an ID assigned to each of the junction box controller 12 and the refrigerator controller 13 in advance. Then, the information on the operation information transmitted together with the ID is received from each of the junction box controller 12 and the refrigerator controller 13, and stored in the storage unit 32 for management. The operation information transmitted from each of the junction box controllers 12 includes information on the temperature in the interior of the showcase 2, the information on the state of the defrosting operation of the evaporator 6, and the error information related to the error (abnormality) generated by the showcase 2. The operation information transmitted from the refrigerator 4 includes the operation state (the value of the number of revolutions) of the compressor 3, the value of the low pressure pressure, the value of the refrigerant discharge temperature Td and the refrigerant discharge pressure Pd, and the error (abnormal) generated by the refrigerator 4. Related alert information.

Further, the main controller 11 transmits the information related to the instruction information together with the ID to each of the connection box controller 12 and the refrigerator controller 13. The instruction information includes the aforementioned set temperature in the case of the showcase 2, and includes the aforementioned low pressure set value or the like in the case of the refrigerator 4. The control unit 21 of each of the junction box controller 12 and the refrigerator controller 13 stores the received data in the storage unit 22 to control the operation of each device. With these, the main controller 11 centrally manages the operations of the showcases 2 and the refrigerators 4 constituting the freezing apparatus R.

Further, the control unit 31 of the main controller 11 has a condenser clogging determination unit 73 and a notification unit 74 (FIG. 4) as functions thereof, and these functions will be described in detail later.

(5) Non-connected showcase 2 Next, the non-connected showcase 2 that is not connected to the freezing device R in Fig. 1 is, for example, a refrigerated showcase (ice box) that displays and sells ice cream while being cooled, and is provided in an island shape. Access to the store, etc. The showcase 2 is a so-called built-in display case, and includes a well-known refrigerant circuit including a compressor 43, a condenser (not shown), a pressure reducing device 44 such as a capillary tube, and an evaporator 46. The refrigerant discharged from the compressor 43 is concentrated by the decompression device 44, and then flows into the evaporator 46 to evaporate. By the endothermic action at this time, the air circulated by the blower for cooling air circulation (not shown) is cooled, and the cooled cold air is circulated in the reservoir, whereby the interior of the showcase 2 is cooled. The refrigerant evaporated by the evaporator 46 is a cycle in which suction into the compressor 43 is repeated.

(6) The non-connected box controller 47 The non-connected display case 2 is also provided with a non-connected case controller 47 (device controller) composed of a microcomputer as an example of a computer having a processor. However, the non-connected case controller 47 is not connected to the main controller 11 via the communication line 14.

FIG. 5 shows a functional block diagram of the non-connected shell controller 47. The non-connected shell controller 47 includes a control unit 48, a storage unit 49, an internal temperature sensor 50, a discharge temperature sensor 30, a signal input unit 51, a display unit 52, an input unit 53, a device drive unit 54, and wireless communication. In the control unit 48, the control unit 48 manages the compressor 43 of the non-connected showcase 2, the operation control of the cooling air blower, and the communication control between the tablet terminal (mobile terminal device) 41, which will be described later, and the storage unit. 49. The various information (data) is stored, the internal temperature sensor 50 detects the temperature inside the chamber, and the discharge temperature sensor 30 detects the refrigerant discharge temperature Td of the compressor 43 in the same manner as described above, and the signal input unit 51 is identically The discharge pressure sensor 35 that detects the refrigerant discharge pressure Pd of the compressor 43 is connected, the display unit 52 displays various materials and the like, the input unit 53 performs setting switching, and the device drive unit 54 drives the respective devices, and the wireless communication. The unit 56 performs wireless communication of information (data) with the tablet terminal 41 to be described later via the wireless area network.

The control unit 48 of the disconnected-shell controller 47 receives the instruction information (operation instruction data) transmitted from the tablet terminal 41 to the showcase 2, which will be described later, via the wireless communication unit 56, based on the received instruction information (set temperature) and detection. The output of the internal temperature sensor 50 of the own internal temperature is controlled by the device driving unit 54 to control the operation of the compressor 43 and the cooling air circulation fan, and is forcibly executed when the instruction information includes the forced defrosting instruction information. Defrost of the evaporator 46.

(7) Tablet terminal 41 (mobile terminal device) Next, 41 shown in Fig. 1 is the aforementioned tablet terminal. The tablet terminal 41 is a mobile terminal device (mobile terminal device), and includes a display unit 61 composed of a larger liquid crystal display as shown in FIG. 8 and an input constituted by a touch switch provided on the display unit 61. The unit 62 is capable of inputting and outputting information (Fig. 6).

FIG. 6 shows a functional block diagram of the tablet terminal 41. The tablet terminal 41 is also composed of a control unit 63, a storage unit 64, the above-described display unit 61, an input unit 62, and a wireless communication unit 66. The control unit 63 is constituted by a microcomputer as an example of a computer having a processor, and is controlled. Including various controls of communication, the storage unit 64 holds various pieces of information (data) including maintenance information to be described later, and the wireless communication unit 66 is connected between the main controller 11 and the non-connected shell controller 47 via the wireless area network. Wireless communication to receive transmission data.

In FIG. 1, reference numeral 76 denotes a POS terminal that is installed in a store to perform inventory management and sales management of the store, and 77 is responsible for performing maintenance management of equipment such as the showcase 2 and the refrigerator 4 installed in the store. Maintenance center. Further, in Fig. 1, 67 is a wireless area network router that constructs a wireless area network in a store, and the wireless area network router 67 is connected to an internet circuit via a broadband data machine 68.

Further, the tablet terminal 41 and the main controller 11, the tablet terminal 41 and the non-connected case controller 47, and the tablet terminal 41 and the POS terminal 76 perform information (data) via the wireless area network router 67 in the embodiment. Receive transmission (in addition, it is also possible to directly receive and transmit each other without using the wireless network router). Further, the tablet terminal 41 receives and transmits information (data) to and from the external maintenance center 77 via the wireless area network router 67 and the Internet circuit.

In this case, the control unit 63 of the tablet terminal 41 also recognizes the unconnected case controller 47 and the main controller 11 by using an ID assigned to the unconnected case controller 47 and the main controller 11 in advance. Further, the tablet terminal 41 receives the information related to the operation information transmitted together with the ID from the main controller 11 via the wireless communication unit 66, and stores it in the storage unit 64 for management. The operation information sent from the main controller 11 includes information such as the display temperature of the display case 2 and the refrigerator 4 managed by the main controller 11, including the alarm information, and the temperature and humidity inside and outside the store (main controller information). ).

Further, the tablet terminal 41 receives the information related to the operation information transmitted together with the ID from the unconnected case controller 47 via the wireless communication unit 66, and stores it in the storage unit 64 for management. The operation information sent from the non-connected case controller 47 includes information on the internal temperature of the non-connected showcase 2, the status of the defrosting operation of the evaporator 46, and an error (abnormal) related alarm information generated by the showcase 2. Wait.

On the other hand, the wireless communication unit 66 transmits instruction information (operation instruction data) from the tablet terminal 41 to the main controller 11 and the unconnected showcase 2. Since the information collected by the tablet terminal 41 can be appropriately displayed on the display unit 61, it is configured such that each of the display cases can be collectively managed by the main controller 11 in addition to the unconnected showcase 2 in the tablet terminal 41. 2. The operation status of the refrigerator 4 is centrally managed.

(8) Condenser clogging determination control of the main controller 11 (1) Next, an example of determination control of whether or not the condenser clogging of the refrigerator 3 of the refrigerating apparatus R is performed will be described with reference to Figs. 7 and 8 . As described above, the external air is ventilated to the condenser 5 provided in the refrigerator 4 via the condenser filter 10 via the condenser fan 10, but the outside air contains dust, so that the condenser 5 itself (heat dissipation for heat exchange) occurs. The condenser filter 10 is clogged with the blocked condenser due to dust between the sheets, between the fins and the refrigerant piping.

When such a clogging of the condenser occurs, the ventilation performance of the outside air to the condenser 5 is deteriorated, so that the heat exchange efficiency between the refrigerant and the outside air is lowered, the power consumption is increased, and the cooling capacity in the display chamber of the showcase 2 is lowered. It is getting worse. On the other hand, when the condenser clogging occurs, the refrigerant discharge temperature Td of the compressor 3 rises. Therefore, in this embodiment, the refrigerant discharge temperature Td is compared with the predetermined threshold value STh to determine the occurrence of the condenser clogging, but it does not occur. When the condenser is clogged, the refrigerant discharge temperature Td of the compressor 3 tends to be low in an environment where the outside air temperature AT is low, and becomes high in an environment where the outside air temperature AT is high.

FIG. 7 shows a result of actually measuring the dispersion of the refrigerant discharge temperature Td of the compressor 3 in a state where the condensers are not blocked in the two stores A and B. Each of the white circles in the figure is the average refrigerant discharge temperature Td of the A shop, and each black circle is the refrigerant discharge temperature Td of the B shop one day, which is the result of actually measuring them over the course of one year. In this case, the horizontal axis represents the outside air temperature AT, and the vertical axis represents the refrigerant discharge temperature Td. As can be seen from the figure, in a state where the condenser is not clogged in each store, the refrigerant discharge temperature Td is low in an environment where the outside air temperature AT is low, and the external air temperature AT is higher, and the refrigerant discharge temperature Td is also The higher the so-called rising tendency. Further, the degree to which the refrigerant discharge temperature Td becomes high also differs depending on the outside air temperature AT.

Therefore, for example, for the highest refrigerant discharge temperature Td1 (shown in FIG. 7), a sufficient threshold value STh (STh=Td1+α) is set for the main controller 11 with a sufficient margin α (a fixed value of positive). When the refrigerant discharge temperature Td exceeds the threshold value STh, the main controller 11 determines that if the condenser is clogged in the refrigerator 4, if the condenser clogging occurs in an environment where the outside air temperature AT is low in winter, even if the temperature is discharged. Since Td rises and the difference from the threshold value STh is also large, it is not determined that the condenser clogging has occurred, and when the summer discharge temperature Td exceeds the threshold value STh, the condenser is clogged. As a result, the goods in the showroom are deteriorated.

(8-1) Change Control of Threshold STd of Main Controller 11 Therefore, the condenser clogging determining portion 73 of the main controller 11 in this embodiment is based on the external air temperature AT detected by the external air temperature sensor 45, the external gas temperature The higher the AT, the more the threshold STh is changed in the direction of becoming higher. Next, referring to Fig. 7, the change control of the threshold value STh of the main controller 11 will be specifically described. In the embodiment, the threshold value STh is set in the storage unit 32 of the main controller 11. Further, in the embodiment, the outside air temperature AT is divided into a low temperature section of 10 ° C or less, a medium temperature section of more than 10 ° C and 20 ° C or less, and a high temperature section of 20 ° C or higher ( FIG. 7 ). The relationship between the outside air temperature AT and the threshold value STd is set as a linear function for each temperature section, and the degree to which the threshold value STd becomes high is changed by the slope of each time function (a, c, e below).

A straight line L1 of the solid line in FIG. 7 indicates the threshold value STd of the low temperature section, a straight line L2 of the solid line indicates the threshold value STd of the middle temperature section, and a straight line L3 of the solid line indicates the threshold value STd of the high temperature section, and the equation of each straight line L1 to L3 The child is as follows.

Here, a to f are positive values, and in order to make the straight lines L1 to L3 continuous, the relationship of d=10a+b-10c and f=20c+d-20e is obtained.

The straight line L1 is higher in a predetermined margin (β is a positive value) than the highest discharge temperature Td of each of the outside air temperatures AT in the low temperature section (which increases as the external air temperature AT increases). Determine the slope a and the intercept b. In addition, the straight line L2 determines the slope c such that the predetermined maximum margin β is higher than the highest discharge temperature Td of each of the external gas temperatures AT in the intermediate temperature range (the height is increased as the external air temperature AT increases). Further, the straight line L3 determines the slope so as to be higher than the predetermined discharge margin Td (the height of the external air temperature AT is increased in accordance with the rise of the outside air temperature AT) in the high temperature section. e.

In the case of the example of the A shop and the B shop in FIG. 7 , the discharge temperature Td in the middle temperature range is the largest according to the outside air temperature AT, and therefore the slope c (the degree to which the threshold value STd becomes high) is set as the middle temperature section. The ratio of the slope a (the extent to which the threshold value STd becomes high) to the slope of the high temperature section (the extent to which the threshold value STd becomes high) is large, and the discharge temperature Td is increased to the next highest temperature range. The slope e is set to a value larger than the slope a of the low temperature section.

The condenser clogging determining unit 73 of the control unit 31 of the main controller 11 is based on the refrigerant discharge temperature Td sent from the refrigerator controller 13 of the refrigerator 4 and the outside air temperature AT detected by the external air temperature sensor 45. When the refrigerant discharge temperature Td exceeds the threshold value STd (FIG. 7) of the outside air temperature AT at this time, and, for example, when the state continues for a predetermined period of time, it is determined that the condenser clogging occurs in the refrigerator 4.

(8-2) Notification operation by the main controller 11 When the condenser clogging determination unit 73 determines that the condenser clogging has occurred in the refrigerator 4 as described above, the notification unit 74 of the control unit 31 of the main controller 11 Perform the scheduled notification action. FIG. 8 shows an example of the notification operation in this case. 8 is displayed on the display unit 61 of the tablet terminal 41, but the same or equivalent notification operation is performed on the display unit 34 of the main controller 11. In other words, the notification unit 74 of the control unit 31 of the main controller 11 of the embodiment displays an alarm (notification operation) to its own display unit 34, and notifies the tablet terminal 41 to display the display unit 61 of the tablet terminal 41. The alarm of Figure 8 is displayed.

As described above, the main controller 11 determines that the condenser clogging occurs based on the refrigerant discharge temperature Td of the compressor 3 exceeding the predetermined threshold value STh, performs a predetermined notification operation, and changes the threshold value STh based on the outside air temperature AT, so as described above. By the main controller 11, the threshold value STh is changed in the direction in which the external air temperature AT is higher as the external air temperature AT is higher, whereby the threshold value STh can be lowered in an environment where the outside air temperature AT is low, and the external air temperature AT is high. Increase the threshold STh.

Therefore, even if the outside air temperature AT changes due to the seasons or the like, it is possible to determine whether or not the condenser clogging has occurred early and accurately, and it is possible to urge maintenance, and it is possible to prevent an increase in power consumption and deterioration of the display product.

In addition, the refrigerant discharge temperature Td of the compressor 3 tends to be high depending on the outside air temperature AT. Therefore, the main controller 11 changes the threshold value STh to a higher level in accordance with the outside air temperature AT as in the embodiment. It is possible to more accurately determine whether or not a condenser clogging has occurred.

In this case, in the embodiment, the main controller 11 divides the outside air temperature AT into a plurality of temperature sections (low temperature section, medium temperature section, and high temperature section), and the threshold value STh is increased for each temperature section by a one-time function. Since the slopes (a, c, and e) are changed, the job or the like for determining the set value for control can be simplified.

(Embodiment 2) (9) Condenser clogging determination control of the main controller 11 (Part 2) Next, another example of the determination control of whether or not the condenser clogging occurs in the refrigerator 3 of the refrigerating apparatus R will be described with reference to Fig. 9 . As described above, when the condenser of the refrigerator 4 is clogged, the refrigerant discharge pressure Pd of the compressor 3 also rises. Therefore, in this embodiment, the refrigerant discharge pressure Pd is compared with the predetermined threshold value SPh to determine that the condenser clogging has occurred, but in the case where the condenser clogging does not occur, the refrigerant discharge pressure Pd of the compressor 3 also has the external gas temperature AT. It tends to become low in a low environment and to become high in an environment where the outside air temperature AT is high.

FIG. 9 shows a result of actually measuring the dispersion of the refrigerant discharge pressure Pd of the compressor 3 in a state where the condensers of the A store and the B store are not clogged. Each of the white circles in the figure is the average refrigerant discharge pressure Pd of the A shop, and each black circle is the refrigerant discharge pressure Pd of the B shop for one day, and they are actually measured over one year. In this case, the horizontal axis represents the outside air temperature AT, and the vertical axis represents the refrigerant discharge pressure Pd. As can be seen from the figure, in the state where the condenser is not clogged in each store, the refrigerant discharge pressure Pd is low in an environment where the outside air temperature AT is low, and the external air temperature AT is higher, and the refrigerant discharge pressure Pd. The higher the so-called rising tendency. Further, the degree to which the refrigerant discharge pressure Pd becomes high differs depending on the outside air temperature AT.

Therefore, this case is also set to a fixed threshold SPh (SPh = Pd1 + γ) for the main controller 11 with a sufficient margin γ (a fixed value of γ is positive) for the highest refrigerant discharge pressure Pd1 (shown in FIG. 9). When the main controller 11 determines that the condenser clogging occurs in the refrigerator 4 by the refrigerant discharge pressure Pd exceeding the threshold value SPh, if the condenser clogging occurs in an environment where the outside air temperature AT is low in winter, even if Since the discharge pressure Pd rises and the difference from the threshold value SPh is also large, it is not determined that the condenser clogging has occurred, and when the summer discharge pressure Pd exceeds the threshold value SPh, the condenser is clogged. As a result, the goods in the showroom are deteriorated.

(9-1) Change Control of Threshold SPd of Main Controller 11 Therefore, the condenser clogging determination section 73 of the main controller 11 in this embodiment is based on the external air temperature AT detected by the external air temperature sensor 45, the external gas temperature The higher the AT, the more the threshold SPh is changed in the direction of becoming higher. Next, referring to Fig. 9, the change control of the threshold value SPh of the main controller 11 will be specifically described. In the embodiment, the threshold value SPh is set in the storage unit 32 of the main controller 11. Further, in the embodiment, the outside air temperature AT is divided into a low temperature section of 10 ° C or less, a medium temperature section of more than 10 ° C and 20 ° C or less, and a high temperature section of 20 ° C or higher ( FIG. 9 ). The relationship between the outside air temperature AT and the threshold value SPd is set in a linear function for each temperature section, and the degree to which the threshold value SPd becomes high is changed by the slope of each time function (g, i, k below).

A straight line L4 of the solid line in FIG. 9 indicates the threshold value SPd of the low temperature section, a straight line L5 of the solid line indicates the threshold value SPd of the middle temperature section, and a straight line L6 of the solid line indicates the threshold value SPd of the high temperature section, and the equation of each straight line L4 to L6 The child is as follows.

Here, g to l are positive values, and in order to make each of the straight lines L4 to L6 continuous, the relationship is j=10g+h-10i, l=20i+j-20k.

The straight line L4 has a predetermined margin δ (δ is a positive value) higher than the highest discharge pressure pd of each of the outside air temperatures AT in the low temperature section (higher as the external air temperature AT rises). Determine the slope g and the intercept h. In addition, the straight line L5 determines the slope i such that the predetermined maximum margin δ is higher than the highest discharge pressure Pd of each of the external gas temperatures AT in the intermediate temperature range (the height is increased as the external air temperature AT increases). Further, the straight line L6 determines the slope k such that the predetermined maximum margin δ is higher than the highest discharge pressure Pd of each of the outside air temperatures AT in the high temperature section (which increases as the rise of the outside air temperature AT increases).

In the case of the example of the A store and the B store in FIG. 9 , the discharge pressure Pd is increased to the maximum in the high temperature range according to the outside air temperature AT. Therefore, the slope k (the degree to which the threshold SPd becomes high) is set as the high temperature zone. The ratio is larger than the slope g of the low temperature section (the extent to which the threshold value SPd becomes high), the slope i of the middle temperature section (the extent to which the threshold value SPd becomes high), and the extent to which the discharge pressure Pd is increased to the next medium temperature interval. The slope i is set to a value larger than the slope g of the low temperature section.

The condenser clogging determining unit 73 of the control unit 31 of the main controller 11 is based on the refrigerant discharge pressure Pd sent from the refrigerator controller 13 of the refrigerator 4 and the outside air temperature AT detected by the external air temperature sensor 45. When the refrigerant discharge pressure Pd exceeds the threshold value STd (FIG. 9) of the outside air temperature AT at this time, and, for example, when the state continues for a predetermined period of time, it is determined that the condenser clogging occurs in the refrigerator 4.

(9-2) Notification operation by the main controller 11 When the condenser clogging determination unit 73 determines that the condenser clogging has occurred in the refrigerator 4 as described above, the notification unit 74 of the control unit 31 of the main controller 11 Perform the scheduled notification action. The notification action in this case is also the same as the above-described actual (Fig. 8). In other words, the notification unit 74 of the control unit 31 of the main controller 11 performs an alarm display (notification operation) on its own display unit 34, and notifies the tablet terminal 41, and performs the display unit 61 of the tablet terminal 41 on the display unit 61 of FIG. The alarm is displayed.

In this way, the main controller 11 determines that the condenser clogging occurs based on the refrigerant discharge pressure Pd of the compressor 3 exceeding the predetermined threshold value SPh, performs a predetermined notification operation, and changes the threshold value SPh based on the outside air temperature AT, also by the main The controller 11 changes the threshold value SPh in a direction in which the external air temperature AT is higher as the external air temperature AT is higher, whereby the threshold value SPh can be lowered in an environment where the outside air temperature AT is low, and the threshold value SPh can be raised in an environment where the outside air temperature AT is high. .

Therefore, even if the outside air temperature AT changes due to the seasons or the like, it is possible to determine whether or not the condenser clogging has occurred early and accurately, and it is possible to urge maintenance, and it is possible to prevent an increase in power consumption and deterioration of the display product.

In addition, since the refrigerant discharge pressure Pd of the compressor 3 tends to be high depending on the outside air temperature AT, the main controller 11 changes the threshold value SPh to a higher level in accordance with the outside air temperature AT, thereby making it possible to more accurately A determination is made as to whether or not the condenser is clogged.

Further, in the embodiment, the main controller 11 also divides the outside air temperature AT into a plurality of temperature sections (low temperature section, medium temperature section, and high temperature section), and the threshold value SPh is increased for each temperature section by a one-time function. Since the slope (g, i, k) is changed, it is possible to simplify the work of determining the set value for control and the like.

(Embodiment 3) In the above embodiments, the case where the condenser clogging is determined based on the refrigerant discharge temperature Td and the condenser clogging is determined based on the refrigerant discharge pressure Pd has been described. However, the present invention is not limited thereto. When the refrigerant discharge temperature Td exceeds the threshold value STh and the refrigerant discharge pressure Pd exceeds the threshold value SPh, for example, when the state continues for a predetermined period of time, it is determined that the condenser clogging occurs in the refrigerator 4. Also in this case, the threshold value STh and the threshold value SPh are changed based on the outside air temperature AT as described above. Thereby, the occurrence of the clogging of the condenser can be determined more accurately.

Further, in the embodiment, the example of the A shop and the B shop is comprehensively determined, and a linear function of the relationship between the threshold value STh, the threshold value SPh, and the outside air temperature AT is determined. However, the present invention is not limited thereto, and may be determined by observing the tendency of each store. Alternatively, it is also possible to comprehensively judge the tendency of more stores to determine a unified one-time function.

Further, in the embodiment, the outside air temperature is divided into a temperature range of a low temperature, a medium temperature, and a high temperature. However, the temperature range is not limited thereto. For example, the outside air temperature may be divided by 1 ° C, and each numerical value and each period shown in the examples may be used. The apparatus that can be applied to the application is appropriately changed within the scope of the gist of the invention.

1‧‧‧Management system

2‧‧‧ Showcase

3‧‧‧Compressor

4‧‧‧Freezer

5‧‧‧Condenser

10‧‧‧Condenser filter

11‧‧‧Main controller (control device)

12‧‧‧Connected box controller (control device)

13‧‧‧Freezer controller (control device)

14‧‧‧Communication line

15‧‧‧Condenser blower

30‧‧‧Exhaust temperature sensor

31‧‧‧Control Department

35‧‧‧Drain pressure sensor

41‧‧‧ tablet terminal (control device)

45‧‧‧External gas temperature sensor

73‧‧‧Condenser Blockage Determination Department

74‧‧‧Notice Department

Fig. 1 is a view for explaining a piping structure including a communication circuit and a refrigeration system of a management system to which a refrigeration system according to an embodiment of the present invention is applied.

2 is a functional block diagram of the junction box controller of FIG. 1.

Figure 3 is a functional block diagram of the freezer controller of Figure 1.

4 is a functional block diagram of the main controller of FIG. 1.

Figure 5 is a functional block diagram of the non-connected box controller of Figure 1.

6 is a functional block diagram of the tablet terminal of FIG. 1.

Fig. 7 is a view showing a relationship between a refrigerant discharge temperature Td of the compressor of Fig. 1, a threshold value STh for condenser clogging determination, and an outside air temperature (Example 1).

Fig. 8 is a front elevational view showing a notification screen of the tablet terminal of Fig. 1;

FIG. 9 is a view showing a relationship between a refrigerant discharge pressure Pd of the compressor of FIG. 1, a threshold value SPh for condenser clogging determination, and an outside air temperature (Example 2).

Claims (6)

A management system for a refrigeration system that manages a refrigeration system, the refrigeration system including a compressor, a condenser, and a condenser air blower, wherein the condenser blower blows the suctioned outside air to the condenser, and is characterized in that the refrigerant is provided a discharge temperature sensor for a refrigerant discharge temperature of the compressor, an external gas temperature sensor for detecting an outside air temperature, and a control device that determines that the condensation occurs based on a refrigerant discharge temperature of the compressor exceeding a predetermined threshold value STh The device is clogged, performs a predetermined notification action, and changes the aforementioned threshold value STh based on the outside air temperature. The management system of the refrigeration system according to claim 1, further comprising: a discharge pressure sensor that detects a refrigerant discharge pressure of the compressor, wherein the control device is based on a refrigerant discharge temperature of the compressor exceeding a threshold value STh and the compressor When the refrigerant discharge pressure exceeds a predetermined threshold value SPh, it is determined that the condenser clogging has occurred, the notification operation is performed, and the threshold value STh and the threshold value SPh are changed based on the outside air temperature. A management system for a refrigeration system that manages a refrigeration system, the refrigeration system including a compressor, a condenser, and a condenser air blower, wherein the condenser blower blows the suctioned outside air to the condenser, and is characterized in that the refrigerant is provided a discharge pressure sensor for a refrigerant discharge pressure of the compressor, an external gas temperature sensor for detecting an outside air temperature, and a control device that determines that the condensation occurs based on a refrigerant discharge pressure of the compressor exceeding a predetermined threshold value SPh The device is clogged, performs a predetermined notification action, and changes the aforementioned threshold SPh based on the outside air temperature. The management system of the refrigeration system according to any one of claims 1 to 3, wherein the control device changes the threshold value STh and/or the threshold value SPh in a direction in which the external air temperature is higher. The management system of the refrigeration system according to claim 4, wherein the control device changes the threshold value STh and/or the threshold value SPh to a higher level in response to an outside air temperature. The management system of the refrigeration system according to claim 5, wherein the control device divides the outside air temperature into a plurality of temperature intervals, and changes the threshold value STh and/or the threshold value SPh by a slope of a linear function for each temperature interval. The degree of heightening.