JP2019100570A - Management system of refrigeration device - Google Patents

Abstract

To provide a management system of a refrigeration device capable of early and accurately determining occurrence of clogging in a condenser, and giving a notification.SOLUTION: A management system of a refrigeration device is configured to manage a refrigeration device R, which delivers to a condenser 5 outside air suctioned by an air blower 15 for condenser. The management system comprises a discharge temperature sensor configured to detect a discharged refrigerant temperature Td of a compressor 3, an outside temperature sensor configured to detect an outside temperature, and a main controller 11. The main controller is configured to, based on the fact that the discharged refrigerant temperature of the compressor exceeds a predetermined threshold STh, determine that clogging occurs in the condenser and execute predetermined notification operation, and based on the outside temperature, change the threshold STh.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, a plurality of showcases (ware) have been installed in stores (inside stores) such as convenience stores, and sandwiches, rice balls, lunchboxes, noodles, side dishes, foods such as desserts, beverages such as water, tea, juice Displayed and sold while cooling refrigerated products), ice and frozen foods etc. (refrigerated products). In this case, the evaporator of each showcase (referred to as a separately mounted showcase) constitutes the refrigerant circuit of the refrigeration system together with the compressor and condenser of the refrigerator installed outside the store etc., and discharges from the compressor The condensed refrigerant is condensed by the condenser and distributed to the evaporators of the showcases (see, for example, Patent Document 1).

  In this case, in the condenser installed in the refrigerator, the refrigerant is condensed by ventilating the outside air through the condenser filter by the condenser blower, but since the outside air contains dust, the condenser is Condenser plugging occurs which clogs itself and the condenser filter. If the condenser is blocked, the ventilation performance will deteriorate, so the heat exchange efficiency between the refrigerant and the outside air will decrease, power consumption will increase, and if left as it is, the cooling capacity of the display room will decrease and the product will deteriorate. .

JP 2001-272149 A

  Here, when the blockage of the condenser occurs, the discharge refrigerant temperature and the discharge refrigerant pressure of the compressor increase. Therefore, it is conceivable that the discharge refrigerant temperature and the discharge refrigerant pressure are compared with a predetermined threshold value to judge the occurrence of clogging of the condenser and to notify and prompt maintenance, but the discharge refrigerant temperature and the discharge refrigerant pressure of the compressor Generally, it is low in an environment where the outside air temperature is low, and tends to be high in an environment where the outside air temperature is high. Therefore, if it is determined that the condenser is blocked by a fixed threshold, for example, in an environment where the outside air temperature is low such as winter, it is not known that the condenser is blocked, and it is discovered only in summer and causes product deterioration. Problems occur.

  The present invention has been made to solve such conventional technical problems, and provides a management system of a refrigeration system that can promptly and accurately determine and report the occurrence of clogging of a condenser. The purpose is

  The management system of the refrigeration system according to the invention of claim 1 comprises a compressor, a condenser, and a blower for the condenser, and manages the refrigeration device for ventilating the outside air sucked by the blower for the condenser to the condenser, , A discharge temperature sensor for detecting the discharge refrigerant temperature of the compressor, an outside air temperature sensor for detecting the outside air temperature, and a control device, wherein the discharge refrigerant temperature of the compressor exceeds a predetermined threshold STh , And performs a predetermined notification operation based on the judgment that the condenser is blocked, and changes the threshold value STh based on the outside air temperature.

  The refrigeration system management system according to the invention of claim 2 includes a discharge pressure sensor for detecting the discharge refrigerant pressure of the compressor in addition to the above invention, and the control device is configured such that the discharge refrigerant temperature of the compressor exceeds a threshold STh and Based on the discharge refrigerant pressure of the compressor exceeding the predetermined threshold value SPh, it is determined that the condenser is blocked and the notification operation is performed, and the threshold value STh and the threshold value SPh are changed based on the outside air temperature It is characterized by

  The management system of the refrigeration system according to the invention of claim 3 comprises a compressor, a condenser, and a blower for the condenser, and manages the refrigeration device for ventilating the outside air sucked by the blower for the condenser to the condenser, A discharge pressure sensor for detecting the discharge refrigerant pressure of the compressor, an outside air temperature sensor for detecting the outside air temperature, and a control device, wherein the discharge refrigerant pressure of the compressor exceeds a predetermined threshold value SPh , And determines that the condenser is blocked, and executes a predetermined notification operation, and changes the threshold value SPh based on the outside air temperature.

  The management system of the refrigeration apparatus of the invention of claim 4 is characterized in that in the above respective inventions, the control device changes the threshold value STh and / or the threshold value SPh in the direction of increasing as the outside air temperature becomes higher.

  The management system of the refrigeration system of the invention of claim 5 is characterized in that, in the above-mentioned invention, the control device changes the degree of raising the threshold STh and / or the threshold SPh according to the outside air temperature.

  In the refrigeration system management system according to the sixth aspect of the present invention, in the storage system according to the sixth aspect, the control device classifies the outside air temperature into a plurality of temperature zones and raises the threshold STh and / or the threshold SPh for each temperature zone. It is characterized by changing by the inclination of.

  According to the invention of claim 1 or claim 3, a system for managing a refrigeration system including a compressor, a condenser, and a blower for a condenser and ventilating external air sucked by the blower for the condenser to the condenser A discharge temperature sensor for detecting the discharge refrigerant temperature of the compressor or a discharge pressure sensor for detecting the discharge refrigerant pressure of the compressor, an outside air temperature sensor for detecting the outside air temperature, and a control device; Based on the refrigerant temperature or the discharge refrigerant pressure exceeding the predetermined threshold value STh or the threshold value SPh, it is determined that the condenser is blocked and a predetermined notification operation is performed, and the threshold value STh or the threshold value STh or Since the threshold value SPh is changed, for example, the controller according to the fourth aspect of the present invention changes the threshold value STh or the threshold value SPh in the direction of increasing as the outside air temperature becomes higher. Doing, low threshold STh, the Ph in the outside air temperature is low environment outside temperature it is possible to increase the threshold STh, the SPh at high environment.

  As a result, even when the outside air temperature changes due to factors such as season, it is possible to promptly and accurately determine whether or not the condenser is blocked, and to prompt maintenance. As a result, it is possible to prevent the increase in power consumption and the deterioration of display products.

  Furthermore, as in the invention of claim 2, the control device causes the condenser to be blocked based on the fact that the discharge refrigerant temperature of the compressor exceeds the threshold STh and the discharge refrigerant pressure of the compressor exceeds the predetermined threshold SPh. If the threshold value STh and the threshold value SPh are changed based on the outside air temperature, the occurrence of the closing of the condenser can be determined more accurately.

  Here, since the tendency of the discharge refrigerant temperature and the discharge refrigerant pressure of the compressor to increase differs depending on the outside air temperature, the control device as in the invention of claim 5 increases the threshold STh and the threshold SPh according to the outside air temperature. By changing the degree of change, it is possible to more accurately determine whether or not the condenser is blocked.

  In this case, as in the invention of claim 6, the control device divides the outside air temperature into a plurality of temperature zones and changes the degree of increasing the threshold STh and the threshold SPh for each temperature zone by the slope of the linear function. For example, it is possible to further simplify the work of determining the setting value for control.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the communication network of the management system containing the freezing apparatus of one Example to which this invention is applied, and the piping structure of a freezing apparatus. It is a functional block diagram of the connection case controller of FIG. It is a functional block diagram of the refrigerator controller of FIG. It is a functional block diagram of the main controller of FIG. It is a functional block diagram of the non-connection case controller of FIG. It is a functional block diagram of the tablet terminal of FIG. It is a figure which shows the relationship between discharge refrigerant temperature Td of the compressor of FIG. 1, threshold value STh for the condenser blockage determination, and external temperature (Example 1). It is a front view which shows the alerting | reporting screen of the tablet terminal of FIG. It is a figure which shows the relationship between discharge refrigerant pressure Pd of the compressor of FIG. 1, threshold value SPh for condenser blockage determination, and external temperature (Example 2).

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

FIG. 1 shows a communication line of a management system 1 including a refrigeration system R of an embodiment to which the present invention is applied and a piping configuration of the refrigeration system R.
(1) Refrigeration system R
In FIG. 1, the refrigeration system R of the embodiment includes, for example, a plurality of showcases (devices) 2 installed at the inner wall of a store such as a convenience store, and a refrigerator 3 and the like, and installed outside the store It is comprised from the machine 4 (device). Each showcase 2 is provided with an evaporator 6, an expansion valve (electronic expansion valve) 7 and a blower (not shown) for circulating cold air, and the refrigerator 4 has a condenser 5 and a condenser filter 10 in addition to the compressor 3. , And a condenser blower 15 is provided. In addition, although shown with the single compressor 3 in the Example, you may comprise the compressor 3 of the refrigerator 4 of FIG. 1 with multiple 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 when the condenser fan 15 is operated, outside air is transferred to the condenser 5 through the condenser filter 10 by the condenser fan 15. It is configured to be sucked and ventilated.

  On the other hand, each showcase 2 is a so-called separate-type showcase, and the inlets of the evaporators 6 of the showcases 2 are connected in parallel to high pressure piping (refrigerant piping) 8 via expansion valves 7 respectively. The outlet of is connected to the suction piping of the compressor 3 via the low pressure piping (refrigerant piping) 9. The high-pressure pipe 8 and the low-pressure pipe 9 are disposed from the refrigerator 4 installed outside the store to each showcase 2 installed in the store, and the refrigerant circuit RC of the refrigeration system R is configured by these ing.

  Then, the high-temperature and high-pressure refrigerant (for example, R404a etc.) discharged from the compressor 3 flows into the condenser 5, where it is air-cooled and condensed by the outside air ventilated from the condenser blower 15. The refrigerant leaving the condenser 5 exits the refrigerator 4 and enters the high pressure pipe 8, and is distributed to each showcase 2 via the high pressure pipe 8. The refrigerant distributed and supplied from the common compressor 3 to the showcases 2 is throttled by the expansion valves 7, and then flows into the evaporator 6 to evaporate. The inside of each showcase 2 is cooled by cooling the air circulated by the cold air circulation blower by the heat absorption action at this time and circulating the cooled cold air into the inside of the case. Thereafter, the refrigerant evaporated by the evaporator 6 is circulated through the low pressure pipe 9 into the refrigerator 4 and sucked into the compressor 3.

(2) Connection case controller 12
Each showcase 2 constituting the refrigeration system R is provided with a connection case controller 12 (apparatus controller, which constitutes a part of the control device in the present invention) constituted by a microcomputer which is an example of a computer provided with a processor. It is done. FIG. 2 shows a functional block diagram of the connection case controller 12. The connection case controller 12 controls the operation of the expansion valve 7 and the cold air circulating blower of the showcase 2 and controls the communication with the main controller 11 to be described later, and a storage unit that stores various information (data). 22, a signal input unit 23 to which a temperature sensor 25 and the like for detecting the temperature inside the chamber are connected, a display unit 24 for displaying various data and the like, an input unit 26 for switching settings and the like, The apparatus drive unit 27 includes a communication unit 28 that transmits and receives information (data) via a main controller 11 described later and a communication line 14 described later.

  The control unit 21 of each connection case controller 12 receives, via the communication unit 28, instruction information (operation instruction data) transmitted from the main controller 11 to be described later to each showcase 2 and receives the received instruction information (setting The device drive unit 27 controls the valve opening degree of the expansion valve 7 and the operation of the blower for circulating cold air based on the temperature) and the output of the temperature sensor 25 that detects the temperature inside the chamber.

  In this case, the showcase 2 is a fixture for displaying and selling products such as lunch box, noodles, side dishes, desserts, ice, etc. while cooling down, and the control unit 21 of the connection case controller 12 of the showcase 2 has an average internal temperature. The valve opening degree of the expansion valve 7 is controlled by the device drive unit 27 between fully closed and the control upper limit opening degree so that each set temperature (instruction information) is obtained, and the operation of the cold air circulation fan is controlled.

(3) Refrigerator controller 13
Further, the refrigerator 4 is also provided with a refrigerator controller 13 (apparatus controller, which constitutes a part of the control device in the present invention) configured of a microcomputer which is an example of a computer provided with a processor. The configuration of the refrigerator controller 13 is basically the same as that shown in FIG. 2, but the signal input unit 23 has a discharge temperature sensor 30 (attached to the discharge pipe) for detecting the discharge refrigerant temperature Td of the compressor 3 A device to which the discharge pressure sensor 35 for detecting the discharge refrigerant pressure of the device 3 and the low pressure sensor 40 are connected and driven by the device drive unit 27 is the compressor 3 and the like.

  Then, the control unit 21 of the refrigerator controller 13 receives instruction information (operation instruction data) addressed to the refrigerator controller 13 from the main controller 11 described later via the communication unit 28, and this instruction information (low pressure setting value) And the output of the low pressure sensor 40 for detecting the low pressure of the refrigerant circuit RC from the low pressure pipe 9 to the suction side of the compressor 3 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 sets the low pressure to the low pressure based on the low pressure setting value (instruction information) transmitted from the main controller 11 and the low pressure (actually measured) detected by the low pressure sensor 40. When the pressure is higher than the value, the low speed pressure is set to the low pressure by controlling the operation of the compressor 3 in a direction to increase the number of rotations (operating frequency Hz) of the compressor 3 While controlling to the value, when the expansion valves 7 of all the showcases 2 are fully closed, the compressor 3 is stopped by the device drive unit 27.

  Further, the discharge refrigerant temperature Td and the discharge refrigerant pressure Pd detected by the discharge temperature sensor 30 and the discharge pressure sensor 35 of the refrigerator controller 13 and the rotation speed (Hz) of the compressor 3 It is configured to be transmitted to the main controller 11 via the communication line 14.

(4) Main controller 11
The main controller 11 is a central control device (also a part of the control device in the present invention) called a store master installed in a management room of a store or the like, and is an example of a computer including a processor. It consists of a microcomputer. FIG. 4 shows a functional block diagram of the main controller 11. The main controller 11 is connected to a control unit 31 which controls control of each device and communication control, a storage unit 32 which stores various information (data), and an outside air temperature sensor 45 which detects outside air temperature AT (temperature outside the store) Signal input unit 33, a display unit 34 comprising a color liquid crystal display etc. displaying various data etc., an input unit 36 comprising a key switch etc., an output unit 37 Communication unit 39 that transmits and receives information (data) via the communication line 14 with the connection case controller 12 and the refrigerator controller 13 described above, and a tablet terminal (portable terminal device) 41 described later. A wireless communication unit 42 wirelessly communicates data via a wireless LAN.

  The communication unit 28 of each connection case controller 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, and the main controller 11 and each unit are connected via the communication line 14. Information (data) is transmitted / received to / from the connection case controller 12 and between the main controller 11 and the refrigerator controller 13. The main controller 11, each connection case controller 12 and the refrigerator controller 13 construct a centralized management system connected by a communication line 14, and the controllers 11, 12, 13 and a tablet terminal 41 described later carry out this operation. The control device in the management system 1 of the refrigeration system R in the example is configured.

  In this case, the control unit 31 of the main controller 11 identifies the connection case controller 12 and the refrigerator controller 13 using an ID assigned to each connection case controller 12 and the refrigerator controller 13 in advance. And the data regarding the operation information transmitted with ID from each connection case controller 12 and the refrigerator controller 13 are received, they are stored in the memory | storage part 32, and are managed. The operation information transmitted from each connection case controller 12 relates to the internal temperature of the showcase 2, the information on the state of the defrosting operation of the evaporator 6, and the error (abnormality) occurring in the showcase 2 The alarm information is included, and the operation information transmitted from the refrigerator 4 includes the operation state (value of the number of revolutions) of the compressor 3 and the low pressure value, and the values of the discharge refrigerant temperature Td and the discharge refrigerant pressure Pd described above. , Alarm information on an error (abnormality) occurring in the refrigerator 4 is included.

  Further, the main controller 11 transmits data relating to the instruction information to the connection case controller 12 and the refrigerator controller 13 together with the aforementioned ID. The instruction information includes the set temperature described above for the showcase 2 and the low pressure set value described above for the refrigerator 4 and the like. The control unit 21 of each connection case controller 12 and the refrigerator controller 13 stores the received data in the storage unit 22 to control the operation of each device. Thus, the main controller 11 centrally manages the operations of the showcases 2 and the refrigerator 4 that constitute the refrigeration system R.

  Moreover, although the control part 31 of the main controller 11 has the condenser closing determination part 73 and the alerting | reporting part 74 as the function (FIG. 4), these functions are explained in full detail later.

(5) Disconnected Showcase 2
Next, the non-connected showcase 2 which is not connected to the refrigeration system R in FIG. 1 is, for example, a frozen showcase (ice case) which is displayed and sold while cooling ice cream, and is formed into an island is set up. The showcase 2 is a so-called built-in showcase, and includes a known refrigerant circuit including a compressor 43, a pressure reducing device 44 such as a condenser and a capillary tube (not shown), and an evaporator 46. The refrigerant discharged from the compressor 43 is throttled by the pressure reducing device 44 and then flows into the evaporator 46 to evaporate. The inside of the showcase 2 is cooled by cooling the air circulated by a cold air circulation blower (not shown) by the heat absorption action at this time and circulating the cooled cold air into the inside of the case. The refrigerant evaporated in the evaporator 46 is repeatedly circulated to be sucked into the compressor 43.

(6) Disconnected case controller 47
The unconnected showcase 2 is also provided with an unconnected case controller 47 (apparatus controller) configured of a microcomputer which is an example of a computer provided with a processor. However, the non-connection 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-connection case controller 47. The non-connection case controller 47 controls the compressor 43 of the non-connection showcase 2 and the operation control of the cold air circulation blower and the communication control with the tablet terminal (portable terminal device) 41 described later; Storage unit 49 for storing various information (data), internal temperature sensor 50 for detecting internal temperature, discharge temperature sensor 30 for detecting discharge refrigerant temperature Td of compressor 43 as described above, discharge of compressor 43 as well A signal input unit 51 to which a discharge pressure sensor 35 for detecting the refrigerant pressure Pd is connected, a display unit 52 for displaying various data, etc., an input unit 53 for switching settings, etc., and an apparatus drive unit for driving the respective devices 54, and a wireless communication unit 56 which performs wireless communication of information (data) via a wireless LAN and a tablet terminal 41 described later.

  The control unit 48 of the non-connection case controller 47 receives, via the wireless communication unit 56, instruction information (operation instruction data) transmitted from the tablet terminal 41 described later to the showcase 2 and receives the received instruction information ( The device drive unit 54 controls the operation of the compressor 43 and the blower for cold air circulation based on the preset temperature) and the output of the internal temperature sensor 50 that detects its own internal temperature, and forced defrost instruction information is indicated in the instruction information. Is forced to perform the defrosting of the evaporator 46.

(7) Tablet terminal 41 (portable terminal device)
Next, 41 shown in FIG. 1 is the tablet terminal described above. The tablet terminal 41 is a portable terminal device (portable terminal device), and an input unit 62 including a display unit 61 formed of a relatively large liquid crystal display as shown in FIG. 8 and a touch switch provided on the display unit 61. It is possible to input and output information (Fig. 6).

  FIG. 6 shows a functional block diagram of the tablet terminal 41. The tablet terminal 41 is also composed of a microcomputer, which is an example of a computer including a processor, and is a control unit 63 that controls various controls including communication, and a storage unit 64 that retains various information (data) including maintenance information described later. The display unit 61 and the input unit 62 described above and a wireless communication unit 66 that transmits and receives data to and from the main controller 11 and the non-connection case controller 47 described above through wireless communication via a wireless LAN.

  Here, in FIG. 1, 76 is a POS terminal provided in a store for inventory control and sales management of the store, and 77 is maintenance management of equipment such as showcase 2 and refrigerator 4 provided in the store. It is an external maintenance center that is contracted to do. Further, in FIG. 1, reference numeral 67 denotes a wireless LAN router for constructing a wireless LAN in the store, and the wireless LAN router 67 is connected to the Internet through a broadband modem 68.

  The tablet terminal 41 and the main controller 11, the tablet terminal 41 and the non-connection case controller 47, and the tablet terminal 41 and the POS terminal 76 transmit and receive information (data) via the wireless LAN router 67 in the embodiment. (Note that direct transmission and reception may be enabled without using such a wireless LAN router). Further, the tablet terminal 41 transmits and receives information (data) to and from an external maintenance center 77 via the wireless LAN router 67 and the Internet.

  Also in this case, the control unit 63 of the tablet terminal 41 identifies the non-connection case controller 47 and the main controller 11 using the non-connection case controller 47 and the ID assigned to the main controller 11 in advance. Then, the tablet terminal 41 receives, by the wireless communication unit 66, data related to the driving information transmitted from the main controller 11 together with the ID, and stores the data in the storage unit 64 for management. The operation information sent from the main controller 11 includes operation information (including alarm information) of each showcase 2 and the refrigerator 4 managed by the main controller 11, such as temperature / humidity outside the store, etc. Information: Main controller information is included.

  In addition, the tablet terminal 41 receives, by the wireless communication unit 66, data relating to driving information transmitted from the non-connection case controller 47 together with the ID, and stores and manages the data in the storage unit 64. The operation information sent from the non-connection case controller 47 includes the temperature inside the non-connected showcase 2, the information on the state of the defrosting operation of the evaporator 46, the error occurring in the showcase 2 ( Alarm information etc. regarding abnormality) is included.

  On the other hand, instruction information (driving instruction data) is transmitted from the tablet terminal 41 to the main controller 11 and the disconnected showcase 2 by the wireless communication unit 66. The tablet terminal 41 can appropriately display the collected information on the display unit 61. Therefore, in addition to the disconnected showcase 2 at the tablet terminal 41, each showcase 2 and the refrigerator 4 centrally managed by the main controller 11 It is configured to be able to centrally manage the driving situation of the

(8) Condenser blocking determination control by the main controller 11 (part 1)
Next, an example of determination control as to whether or not the condenser blockage occurs in the refrigerator 3 of the refrigerator R will be described with reference to FIGS. 7 and 8. In the condenser 5 installed in the refrigerator 4 as described above, the outside air is ventilated by the condenser blower 15 through the condenser filter 10, but since the outside air contains dust, the condenser 5 itself ( Condenser plugging occurs, which causes clogging between the fins for heat exchange, between the fins and the refrigerant pipe) and the condenser filter 10 with dust.

  When such a condenser is blocked, 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 reduced, power consumption is increased, and cooling of the display room of the showcase 2 is performed. The ability is reduced and the product is degraded. On the other hand, since the discharge refrigerant temperature Td of the compressor 3 will rise when the condenser clogging occurs, in this embodiment, the discharge refrigerant temperature Td is compared with a predetermined threshold STh to determine the occurrence of the condenser clogging. Although the compressor is not blocked, the discharge refrigerant temperature Td of the compressor 3 tends to be low in an environment where the outside air temperature AT is low and high in an environment where the outside air temperature AT is high.

  FIG. 7 shows, for example, the results of measurement of the degree of dispersion of the discharge refrigerant temperature Td of the compressor 3 in a state where the blockade of the condenser has not occurred in two shops, A shop and B shop. Each white circle in the figure is the average discharge refrigerant temperature Td of the store A at one day, and each black circle is the discharge refrigerant temperature Td of the store B at one day, which are measured over a year. In this case, the horizontal axis indicates the outside air temperature AT, and the vertical axis indicates the discharge refrigerant temperature Td. As is clear from this figure, the discharge refrigerant temperature Td is low in an environment where the outside air temperature AT is low and the discharge refrigerant temperature is higher as the outside air temperature AT is higher in any store where the condenser is not blocked. There is a tendency of so-called right shoulder rising where Td also increases. Further, the degree to which the discharge refrigerant temperature Td increases also differs depending on the outside air temperature AT.

  Therefore, for example, a fixed threshold value STh (STh = Td1 + α) is set in the main controller 11 with a margin α (α is a positive fixed value) sufficient for the highest discharged refrigerant temperature Td1 (shown in FIG. 7). If the main controller 11 determines that the condenser blockage has occurred in the refrigerator 4 because the refrigerant temperature Td exceeds the threshold value STh, the condenser blockage occurs in an environment where the outside air temperature AT is low, such as in winter. Even if the discharge temperature Td rises, the difference with the threshold value STh is large, so it can not be determined that the condenser is blocked, and the discharge temperature Td exceeds the threshold STh for the first time in summer and the condenser is blocked. It will be discovered. As a result, the product in the display room is deteriorated.

(8-1) Change Control of the Threshold STd by the Main Controller 11 Therefore, in the present embodiment, the condenser closing determination unit 73 of the main controller 11 sets the outside air temperature AT high based on the outside air temperature AT detected by the outside air temperature sensor 45. The threshold value STh is changed in the direction to be higher as it becomes higher. Next, changing control of the threshold STh by the main controller 11 will be specifically described with reference to FIG. In the embodiment, the threshold value STh is set in the storage unit 32 of the main controller 11. In the example, the outside air temperature AT is divided into three temperature zones: a low temperature zone of 10 ° C. or less, a medium temperature zone of 10 ° C. or more and 20 ° C. or less, and a high temperature zone of 20 ° C. (FIG. 7) The relationship between the outside air temperature AT and the threshold value STd is set as a linear function for each temperature zone, and the degree of increasing the threshold value STd is changed by the slope (a, c, e below) of each linear function. Do.

In FIG. 7, the solid line L1 indicates the low temperature zone threshold STd, the solid line L2 indicates the middle temperature zone threshold STd, and the solid line L3 indicates the high temperature zone threshold STd. Formulas of L1 to L3 are as follows.
STh = a × AT + b ・ ・ ・ L1
STh = c × AT + d ・ ・ ・ L2
STh = e × AT + f ・ ・ ・ L3
However, a to f are positive values, and in order to make each straight line L1 to L3 continue, the relationship of d = 10a + b-10c and f = 20c + d-20e is obtained.

  The straight line L1 has a predetermined margin β (β is a positive value) than the highest discharge temperature Td at each outside air temperature AT in the low temperature zone (the temperature rises upward with the rise in the outside air temperature AT). Determine slope a and intercept b to be higher. Further, the straight line L2 is inclined so as to be higher by a predetermined margin β than the highest discharge temperature Td at each outside air temperature AT in the middle temperature zone (the temperature becomes higher with the rising of the outside air temperature AT). Determine c. Furthermore, the straight line L3 is inclined so as to be higher by a predetermined margin β than the highest discharge temperature Td at each outside air temperature AT in the high temperature zone (the temperature rises with the rising of the outside air temperature). Determine e.

  In the case of Store A and Store B in FIG. 7, the degree to which the discharge temperature Td increases due to the outside air temperature AT increases in the middle temperature range most, so the slope c of the middle temperature range (degree to increase the threshold STd) Set a value larger than the inclination a of the low temperature zone (the degree of raising the threshold STd) or the inclination e of the high temperature zone (the degree of raising the threshold STd), and the high temperature is the second highest in the ejection temperature Td. The slope e at the band is set to a value larger than the slope a of the low temperature band.

  The condenser closing determination section 73 of the control section 31 of the main controller 11 is based on the discharged refrigerant temperature Td sent from the refrigerator controller 13 of the refrigerator 4 and the outside air temperature AT detected by the outside air temperature sensor 45. When Td exceeds a threshold STd (FIG. 7) at the outside air temperature AT at that time, for example, the state continues for a predetermined time, it is determined that the condenser 4 is blocked by the refrigerator 4.

(8-2) Notification operation by the main controller 11 When the condenser closing determination unit 73 determines that the condenser 4 is blocked by the refrigerator 4 as described above, the notification unit 74 of the control unit 31 of the main controller 11 Executes a predetermined notification operation. An example of the notification operation in this case is shown in FIG. Although FIG. 8 shows the display unit 61 of the tablet terminal 41, the same or similar notification operation is performed on the display unit 34 of the main controller 11. That is, the notification unit 74 of the control unit 31 of the main controller 11 of the embodiment performs alarm display (notification operation) on the display unit 34 of itself and notifies the tablet terminal 41 of the display unit 34. The alarm display of FIG. 8 is performed.

  As described above, based on the fact that the discharge refrigerant temperature Td of the compressor 3 exceeds the predetermined threshold value STh, the main controller 11 determines that the condenser is blocked and performs a predetermined notification operation, and the outside air Since the threshold value STh is changed based on the temperature AT, the main controller 11 changes the threshold value STh in the increasing direction as the outside air temperature AT becomes higher by the main controller 11 as described above, in an environment where the outside air temperature AT is low. The threshold STh can be lowered and the threshold STh can be raised in an environment where the outside air temperature AT is high.

  As a result, even when the outside air temperature AT changes due to factors such as season, it is possible to promptly and accurately determine whether or not the condenser is blocked, and to prompt maintenance. As a result, it is possible to prevent the increase in power consumption and the deterioration of display products.

  Further, since the tendency of the discharge refrigerant temperature Td of the compressor 3 to become high differs depending on the outside air temperature AT, the main controller 11 changes the degree of increasing the threshold STh according to the outside air temperature AT as in the embodiment. Thus, it can be more accurately determined whether or not the condenser is blocked.

  In this case, in the embodiment, the main controller 11 divides the outside air temperature AT into a plurality of temperature zones (low temperature zone, middle temperature zone, high temperature zone), and increases the threshold STh for each temperature zone by a linear function. Since the change is made based on the inclination (a, c, e) of, it is possible to further simplify the work of determining the set value for control and the like.

(9) Condenser blocking determination control by the main controller 11 (part 2)
Next, another example of determination control as to whether or not the condenser 3 is blocked by the condenser 3 of the refrigeration apparatus R will be described with reference to FIG. As described above, when the condenser 4 is blocked by the refrigerator 4, the discharge refrigerant pressure Pd of the compressor 3 also rises. Therefore, in this embodiment, the discharge refrigerant pressure Pd is compared with a predetermined threshold value SPh to determine the occurrence of the clogging of the condenser. However, in the situation where the clogging of the condenser is not generated, the discharge refrigerant pressure of the compressor 3 is Pd also tends to be low in environments where the outside air temperature AT is low, and to be high in environments where the outside air temperature AT is high.

  FIG. 9 shows the results of measurement of the scattering condition of the discharge refrigerant pressure Pd of the compressor 3 in the state where the blockade of the condenser is not generated in the two shops of the above-mentioned A shop and B shop. Each white circle in the figure is the average discharge refrigerant pressure Pd of Store A daily, and each black circle is the discharge refrigerant pressure Pd of Store B daily, and they are measured over a year. In this case, the horizontal axis indicates the outside air temperature AT, and the vertical axis indicates the discharge refrigerant pressure Pd. As apparent from this figure, the discharge refrigerant pressure Pd is low in an environment where the outside air temperature AT is low and the discharge refrigerant pressure is higher as the outside air temperature AT becomes higher in any store where the condenser is not blocked. It is a so-called upward trend in which Pd also increases. Further, the degree to which the discharged refrigerant pressure Pd increases also differs depending on the outside air temperature AT.

  Therefore, the main controller 11 sets a fixed threshold SPh (SPh = Pd1 + γ) with a margin γ (γ being a positive fixed value) sufficient for the discharged refrigerant pressure Pd1 (shown in FIG. 9), which was the highest in this case as well. If the main controller 11 determines that the condenser blockage has occurred in the refrigerator 4 due to the discharge refrigerant pressure Pd exceeding the threshold value SPh, the condenser blockage occurs in an environment such as winter when the outside air temperature AT is low. Even if the discharge pressure Pd rises, the difference with the threshold SPh is large, so it can not be determined that the condenser is blocked, and the discharge pressure Pd exceeds the threshold SPh for the first time in summer and the condenser The closure will be discovered. As a result, the product in the display room is deteriorated.

(9-1) Change control of the threshold value SPd by the main controller 11 Therefore, also in this embodiment, the condenser closing determination unit 73 of the main controller 11 has a high outside air temperature AT based on the outside air temperature AT detected by the outside air temperature sensor 45. The threshold value SPh is changed in the higher direction as it becomes higher. Next, changing control of the threshold value SPh by the main controller 11 will be specifically described with reference to FIG. In this embodiment, a threshold value SPh is set in the storage unit 32 of the main controller 11. Also in the example, the outside air temperature AT is divided into three temperature zones: a low temperature zone of 10 ° C. or less, a medium temperature zone of 10 ° C. or more and 20 ° C. or less, and a high temperature zone of 20 ° C. (FIG. 9) The relationship between the outside air temperature AT and the threshold value SPd is set as a linear function for each temperature zone, and the degree of increasing the threshold value SPd is changed with the slope (g, i, k below) of each linear function. Do.

In FIG. 9, a solid line L4 indicates the low temperature zone threshold SPd, a solid line L5 indicates the middle temperature zone threshold SPd, and a solid line L6 indicates the high temperature zone threshold SPd. Formulas of L4 to L6 are as follows.
SPh = g x AT + h ... L4
SPh = i x AT + j ... L5
SPh = k x AT + l ... L6
However, g to l are positive values, and in order to make the straight lines L4 to L6 continue, the relationship of j = 10 g + h-10 i and l = 20 i + j-20 k is established.

  The straight line L4 has a predetermined margin δ (δ is a positive value) than the highest discharge pressure pd at each outside air temperature AT in the low temperature zone (which rises in the upper right as the outside air temperature AT rises). Determine the slope g and the segment h to be higher. Further, the straight line L5 is inclined so as to be higher by a predetermined margin δ than the highest discharge pressure Pd at each outside air temperature AT in the middle temperature zone (which becomes higher with an increase in the right shoulder according to the rise of the outside air temperature AT). Determine i. Further, the straight line L6 is inclined so as to be higher by a predetermined margin δ than the highest discharge pressure Pd at each outside air temperature AT in the high temperature zone (the upper side becomes higher with the increase of the outside air temperature AT). Determine k.

  In the case of the A store and B store in FIG. 9, the degree to which the discharge pressure Pd increases due to the outside air temperature AT increases at the highest temperature range, so the slope k of the high temperature range (degree to increase the threshold SPd) Set a value larger than the inclination g of the low temperature zone (the degree of raising the threshold value SPd) or the inclination i of the medium temperature range (the degree of raising the threshold value SPd) The slope i at the band is set to a value larger than the slope g of the low temperature band.

  The condenser closing determination unit 73 of the control unit 31 of the main controller 11 is a discharge refrigerant pressure based on the discharge refrigerant pressure Pd sent from the refrigerator controller 13 of the refrigerator 4 and the outside air temperature AT detected by the outside air temperature sensor 45. If Pd exceeds the threshold value SPd (FIG. 9) at the outside air temperature AT at that time, for example, the state continues for a predetermined time, it is determined that the condenser 4 is blocked by the refrigerator 4.

(9-2) Notification operation by the main controller 11 When the condenser closing determination unit 73 determines that the condenser 4 is blocked by the refrigerator 4 as described above, the notification unit 74 of the control unit 31 of the main controller 11 Executes a predetermined notification operation. The notification operation in this case is also the same as the above-described actual (FIG. 8). That is, the notification unit 74 of the control unit 31 of the main controller 11 performs alarm display (notification operation) on the display unit 34 of itself and notifies the tablet terminal 41, and the display unit 61 of the tablet terminal 41 displays FIG. Display an alarm.

  As described above, based on the fact that the discharge refrigerant pressure Pd of the compressor 3 exceeds the predetermined threshold value SPh, the main controller 11 determines that the condenser is blocked, and performs a predetermined notification operation, as well as the outside air. Even if the threshold value SPh is changed based on the temperature AT, the main controller 11 similarly changes the threshold value SPh in a direction to increase as the outside air temperature AT becomes higher, so that the threshold in an environment where the outside air temperature AT is low. It is possible to lower SPh and to increase the threshold SPh in an environment where the outside air temperature AT is high.

  As a result, even when the outside air temperature AT changes due to factors such as season, it is possible to promptly and accurately determine whether or not the condenser is blocked, and to prompt maintenance. As a result, it is possible to prevent the increase in power consumption and the deterioration of display products.

  Further, since the tendency of the discharge refrigerant pressure Pd of the compressor 3 to become high differs depending on the outside air temperature AT, the main controller 11 similarly changes the degree of raising the threshold value SPh according to the outside air temperature AT. It becomes possible to more accurately determine whether or not the condenser has been blocked.

  Furthermore, also in this embodiment, the main controller 11 divides the outside air temperature AT into a plurality of temperature zones (low temperature zone, middle temperature zone, high temperature zone), and increases the threshold SPh for each temperature zone as a linear function. Since the change is made with the inclination (g, i, k) of the above, it is possible to further simplify the work of determining the set value for control and the like.

  In each of the above embodiments, the case of determining the closing of the condenser by the discharged refrigerant temperature Td and the case of determining the closing of the condenser by the discharged refrigerant pressure Pd have been described, but the invention is not limited thereto. The discharged refrigerant temperature Td exceeds the threshold STh. And, when the discharged refrigerant pressure Pd exceeds the threshold value SPh and, for example, the state continues for a predetermined time, it may be determined that the condenser 4 is blocked by 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 in the same manner as described above. As a result, it is possible to more accurately determine the occurrence of the plugging of the condenser.

  Moreover, although the example of A store and B store was judged collectively in the example and the linear function of the relationship between the threshold value STh or the threshold value SPh and the outside air temperature AT was determined, the present invention is not limited thereto. It may be determined, or the tendency of more stores may be comprehensively determined to determine a unified linear function.

  Furthermore, although the outside air temperature is divided into low, medium, and high temperature zones in the embodiment, the invention is not limited to this. For example, the outside air temperature may be divided by 1 ° C. Each period can be suitably changed according to the apparatus to apply in the range which does not deviate from the meaning of this invention.

1 management system 2 showcase 3 compressor 4 refrigerator 5 condenser 10 condenser filter 11 main controller (control device)
12 Connection Case Controller (Control Device)
13 Refrigerator Controller (Controller)
14 communication line 15 blower for condenser 30 discharge temperature sensor 31 control unit 35 discharge pressure sensor 41 tablet terminal (control device)
45 outside air temperature sensor 73 condenser closing judgment unit 74 notification unit

Claims (6)

A system comprising: a compressor, a condenser, and a blower for the condenser, wherein the system manages a refrigeration system for ventilating outside air sucked by the blower for the condenser to the condenser,
A discharge temperature sensor for detecting a discharge refrigerant temperature of the compressor;
An outside air temperature sensor that detects the outside air temperature,
Equipped with a controller
The control device determines that the condenser blockage has occurred based on the fact that the discharge refrigerant temperature of the compressor exceeds a predetermined threshold STh, and executes a predetermined notification operation, and based on the outside air temperature. The management system of the refrigeration apparatus, wherein the threshold value STh is changed. A discharge pressure sensor for detecting a discharge refrigerant pressure of the compressor;
The controller is configured such that the condenser is blocked based on the discharge refrigerant temperature of the compressor exceeding the threshold STh and the discharge refrigerant pressure of the compressor exceeding a predetermined threshold SPh. The management system of the refrigeration apparatus according to claim 1, wherein the threshold value STh and the threshold value SPh are changed based on the outside air temperature while judging to execute the notification operation. A system comprising: a compressor, a condenser, and a blower for the condenser, wherein the system manages a refrigeration system for ventilating outside air sucked by the blower for the condenser to the condenser,
A discharge pressure sensor for detecting a discharge refrigerant pressure of the compressor;
An outside air temperature sensor that detects the outside air temperature,
Equipped with a controller
The control device determines that the condenser is blocked based on the fact that the discharge refrigerant pressure of the compressor exceeds a predetermined threshold value SPh, and executes a predetermined notification operation, and based on the outside air temperature. The management system of the refrigeration apparatus, wherein the threshold value SPh is changed.   The refrigeration apparatus according to any one of claims 1 to 3, wherein the controller changes the threshold value STh and / or the threshold value SPh in a direction in which the temperature increases as the outside air temperature increases. Management system.   The management system of a refrigeration apparatus according to claim 4, wherein the control device changes the degree of increasing the threshold STh and / or the threshold SPh according to the outside air temperature.   The controller is characterized in that the outside air temperature is divided into a plurality of temperature zones, and the degree of increasing the threshold STh and / or the threshold SPh is changed by the slope of a linear function for each temperature zone. The management system of the refrigeration apparatus as described in.

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