Diagnostic system for scroll compression elements

Abstract

Improve the reliability of the diagnostic results for scroll compression elements. [Solution] The diagnostic system 90 diagnoses the target scroll compression element 111e and comprises an acquisition unit 84, a storage unit 83, a processing unit 11, and an output unit 13. The acquisition unit 84 acquires target data DT. The target rate of change At is a value related to the operation of the target compressor motor 111m and is the rate of change of the target operation index value It with respect to the target state quantity St. The target state quantity St is the state quantity of the refrigerant F in the target refrigeration device 100. The storage unit 83 holds the judgment criterion value J. The processing unit 11 derives the target rate of change At from the target data DT. Based on the target rate of change At and the judgment criterion value J, the processing unit 11 derives a diagnostic result for the target scroll compression element 111e. The output unit 13 outputs the diagnostic result derived by the processing unit 11.

Description

Technical Field

[0001] The present disclosure relates to a diagnostic system for diagnosing the degree of wear of a scroll compression element included in a scroll compressor of a refrigeration device.

Background Art

[0002] Patent Document 1 (Japanese Patent No. 7307357) discloses a technique for diagnosing the quality of a compressor constituting a refrigeration device. What is assumed as a cause of deteriorating the quality of the compressor in this technique is wear of the bearing and deterioration of the oil sealing property of the compression element. In an example of diagnosis, the magnitude of a frequency component corresponding to the rotational speed of the compressor motor or a multiple thereof included in the current flowing through the compressor motor is measured. Next, the quality of the compressor is determined based on the measured frequency component.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Not only the degree of wear of the bearing and the degree of oil sealing property of the compression element, but also the degree of wear of the scroll compression element can be diagnosed using the same technique. The frequency component corresponding to the rotational speed of the compressor motor in the current of the compressor motor varies depending on the rotational speed of the motor, the state quantities of the refrigerant flowing through the refrigeration device (i.e., condensation temperature, evaporation temperature, discharge pressure, suction pressure, etc.), and the degree of wear of the scroll compression element. Therefore, the diagnosis of the degree of wear of the scroll compression element can be performed by comparing the measured frequency component with a threshold value set as a function of the rotational speed of the motor and the state quantities of the refrigerant.

[0004] However, in the space defined by the rotational speed of the motor and the state quantities of the refrigerant, there is a region where the magnitude of the frequency component corresponding to the rotational speed of the compressor motor in the current of the compressor motor does not change significantly depending on the degree of wear of the scroll compression element. Therefore, if the diagnosis is performed only in this region, the reliability of the diagnosis result may not be ensured. [Means for solving the problem]

[0005] The diagnostic system of the first perspective diagnoses the target scroll compression element of the target refrigeration system. The target refrigeration system is equipped with a target compressor. The target compressor has a target scroll compression element and a target compressor motor. The target scroll compression element compresses the refrigerant. The target compressor motor drives the target scroll compression element. The diagnostic system comprises an acquisition unit, a storage unit, a processing unit, and an output unit. The acquisition unit acquires target data. The target data is capable of deriving a target rate of change. The target rate of change is the rate of change of the target operating index value with respect to the target state quantity. The target operating index value is related to the operation of the target compressor motor. The target state quantity is the state quantity of the refrigerant in the target refrigeration system. The storage unit is capable of holding judgment criterion values. The processing unit derives the target rate of change from the target data. Based on the target rate of change and the judgment criterion values, the processing unit derives a diagnostic result for the target scroll compression element. The output unit outputs the diagnostic result derived by the processing unit.

[0006] In this configuration, the diagnostic system diagnoses the condition of the scroll compression element based on a target change rate that is easily affected by the degree of wear of the scroll lap. Therefore, abnormalities in the target compressor can be detected, allowing service personnel to accurately determine whether the compressor needs to be replaced. In turn, malfunctions such as sudden shutdowns of the target compressor can be prevented.

[0007] The second diagnostic system is a first diagnostic system in which the processing unit derives a diagnostic result based on the comparison between the magnitude of the target change rate and the judgment criterion value.

[0008] In this configuration, the diagnostic system diagnoses the quality of the target scroll compression element based on the relationship between the magnitude of the target rate of change and the judgment criterion value. Therefore, since the diagnostic process is simple, the resources of the diagnostic system are not strained.

[0009] The third-perspective diagnostic system is a first-perspective or second-perspective diagnostic system in which the target data includes multiple sets of target operating index values, target state variables, and target rotational speed values. The target rotational speed is the number of rotations per unit time of the target compressor motor. The multiple target rotational speed values ​​included in the target data are concentrated within a predetermined range.

[0010] With this configuration, the values ​​for multiple target rotational speeds included in the target data are approximate to each other. Therefore, it is possible to perform a more accurate diagnosis of the quality of the scroll compression element.

[0011] The fourth-perspective diagnostic system is a first-perspective or second-perspective diagnostic system in which the target data includes multiple pairs of values ​​for target rate of change and target rotational speed. The target rotational speed is the number of rotations per unit time of the target compressor motor. The multiple target rotational speed values ​​included in the target data are concentrated within a predetermined range.

[0012] With this configuration, the values ​​for multiple target rotational speeds included in the target data are approximate to each other. Therefore, it is possible to perform a more accurate diagnosis of the quality of the scroll compression element.

[0013] The fifth diagnostic system is a third or fourth diagnostic system in which the target operating index value is a frequency component in the current of the target compressor motor that corresponds to one or an integer multiple of the target rotational speed.

[0014] In this configuration, the operating index value is the frequency component of the motor current that corresponds to one or an integer multiple of the rotational speed. This allows for accurate quality diagnosis of the scroll compression element.

[0015] The sixth diagnostic system is a diagnostic system for any one of the first to fifth perspectives, wherein the target state quantity is at least one of the following: the pressure of the refrigerant drawn in by the target compressor, the pressure of the refrigerant discharged by the target compressor, the evaporation temperature of the refrigerant in the target refrigeration system, or the condensation temperature of the refrigerant in the target refrigeration system.

[0016] In this configuration, the state variables include one of the compressor's suction pressure, discharge pressure, evaporation temperature, or condensation temperature. Therefore, since values ​​related to the behavior of the refrigerant, which is sensitive to scroll wrap wear, are used as state variables, the quality of the scroll compression element can be diagnosed with high accuracy.

[0017] The seventh perspective diagnostic system is a diagnostic system of either the first perspective or the sixth perspective, wherein the target state quantity includes the first target state quantity and the second target state quantity. The target rate of change includes the first target rate of change and the second target rate of change. The first target rate of change is the rate of change of the target operating index value relative to the first target state quantity. The second target rate of change is the rate of change of the target operating index value relative to the second target state quantity. The processing unit derives a diagnostic result based on the first target rate of change, the second target rate of change, and the judgment criterion value.

[0018] In this configuration, the target state variable is two-dimensional and includes a first target state variable and a second target state variable. Therefore, more accurate diagnosis of scroll compression elements can be performed.

[0019] The diagnostic system of the eighth perspective is the diagnostic system of the first perspective, wherein the memory unit is capable of further storing normal data. The normal data is capable of calculating the normal rate of change. The normal rate of change is the rate of change of the normal operating index value relative to the normal state quantity. The normal operating index value is related to the operation of the normal compressor motor. The normal operating index value is obtained from a normal refrigeration system. The normal operating index value includes a normal scroll compression element and a normal compressor motor. The normal scroll compression element compresses the refrigerant and functions normally. The normal compressor motor drives the normal scroll compression element. The normal state quantity is the state quantity of the refrigerant in the normal refrigeration system. The processing unit derives the diagnostic result based on the target rate of change, the normal rate of change, and the judgment criterion value.

[0020] In this configuration, the diagnostic system diagnoses the quality of the scroll compression element by comparing the rate of change obtained from the target refrigeration unit being diagnosed with the normal rate of change obtained from a properly functioning refrigeration unit. Therefore, a highly reliable diagnosis can be performed.

[0021] The ninth diagnostic system is the eighth diagnostic system, in which the processing unit derives a diagnostic result based on a comparison between the ratio of the magnitude of the target change rate to the magnitude of the normal change rate and the judgment criterion value.

[0022] In this configuration, the ratio of the magnitude of the target rate of change to the magnitude of the normal rate of change is considered in the diagnosis. Therefore, the diagnosis is performed using parameters that easily reflect the degree of wear of the normal scroll compression element, thus improving the accuracy of the diagnosis.

[0023] The diagnostic system of the 10th perspective is a diagnostic system of the 8th or 9th perspective, in which the target data includes multiple sets of values ​​for target operating index value, target state variable, and target rotational speed. The target rotational speed is the number of rotations per unit time of the target compressor motor. The normal data includes multiple sets of values ​​for normal operating index value, normal state variable, and normal rotational speed. The normal rotational speed is the number of rotations per unit time of the normal compressor motor. The multiple target rotational speed values ​​included in the target data and the multiple normal rotational speed values ​​included in the normal data are concentrated within a predetermined common range.

[0024] With this configuration, the values ​​of multiple target rotational speeds included in the target data, and the values ​​of multiple target rotational speeds included in the normal data, are all approximate. Therefore, it is possible to perform a more accurate diagnosis of the quality of the scroll compression element.

[0025] The diagnostic system of the 11th aspect is the diagnostic system of the 8th or 9th aspect, and the target data includes a plurality of sets of values of the target change rate and the target rotation speed. The target rotation speed is the number of rotations per unit time of the target compressor motor. The normal data includes a plurality of sets of values of the normal change rate and the normal rotation speed. The normal rotation speed is the number of rotations per unit time of the normal compressor motor. The values of the plurality of target rotation speeds included in the target data and the values of the plurality of normal rotation speeds included in the normal data are concentrated within a predetermined common range.

[0026] According to this configuration, the values of the plurality of target rotation speeds included in the target data and the values of the plurality of normal rotation speeds included in the normal data are all approximated. Therefore, it is possible to perform a more accurate diagnosis of the quality of the scroll compression element.

[0027] The diagnostic system of the 12th aspect is the diagnostic system of the 10th or 11th aspect, and the target operation index value is a frequency component corresponding to 1 times or an integer multiple of the target rotation speed in the current of the target compressor motor. The normal operation index value is a frequency component corresponding to 1 times or an integer multiple of the normal rotation speed in the current of the normal compressor motor.

[0028] According to this configuration, the operation index value is a frequency component corresponding to 1 times or an integer multiple of the rotation speed in the current flowing through the motor. Thereby, it is possible to perform a more accurate diagnosis of the quality of the scroll compression element.

[0029] The diagnostic system of the 13th aspect is any one of the diagnostic systems from the 8th to the 12th aspect, and the target state quantity is at least any one of the pressure of the refrigerant inhaled by the target compressor, the pressure of the refrigerant discharged by the target compressor, the evaporation temperature of the refrigerant in the target refrigeration device, and the condensation temperature of the refrigerant in the target refrigeration device. The normal state quantity is at least any one of the pressure of the refrigerant inhaled by the normal compressor, the pressure of the refrigerant discharged by the normal compressor, the evaporation temperature of the refrigerant in the normal refrigeration device, and the condensation temperature of the refrigerant in the normal refrigeration device.

[0030] In this configuration, the state variables include one of the compressor's suction pressure, discharge pressure, evaporation temperature, or condensation temperature. Therefore, since values ​​related to the behavior of the refrigerant, which is sensitive to scroll wrap wear, are used as state variables, the quality of the scroll compression element can be diagnosed with high accuracy.

[0031] The diagnostic system for the 14th perspective is a diagnostic system for any one of the 8th to 13th perspectives, wherein the target state quantity includes the target first state quantity and the target second state quantity. The target rate of change includes the target first rate of change and the target second rate of change. The target first rate of change is the rate of change of the target operating index value relative to the target first state quantity. The target second rate of change is the rate of change of the target operating index value relative to the target second state quantity. The normal state quantity includes the normal first state quantity and the normal second state quantity. The normal rate of change includes the normal first rate of change and the normal second rate of change. The normal first rate of change is the rate of change of the normal operating index value relative to the normal first state quantity. The normal second rate of change is the rate of change of the normal operating index value relative to the normal second state quantity. The processing unit derives a diagnostic result based on the target first rate of change, the target second rate of change, the normal first rate of change, the normal second rate of change, and the judgment criterion value.

[0032] In this configuration, the state variables are two-dimensional and include a first state variable and a second state variable. Therefore, more accurate diagnosis of scroll compression elements can be performed.

[0033] The diagnostic system of the 15th perspective is a diagnostic system of any one of the 14th perspectives, further comprising a terminal and a server. The server is capable of communicating with the terminal via a network. The terminal has a processing unit and an output unit. The server has an acquisition unit and a storage unit.

[0034] In this configuration, the diagnostic system includes a terminal and a server. Therefore, data regarding the behavior of the target refrigeration unit and the normal refrigeration unit can be stored in the server's ample storage capacity, enabling highly accurate diagnosis of the quality of the scroll compression element.

[0035] The diagnostic system of the 16th perspective is a diagnostic system of any one of the 14th perspectives from the 1st perspective, and further comprises a terminal. The terminal has an acquisition unit, a storage unit, a processing unit, and an output unit.

[0036] In this configuration, the diagnostic system includes a terminal with most of the main functions. Therefore, diagnostics can be performed flexibly by transporting the terminal to the location where the target refrigeration equipment is installed.

[0037] The method of the 17th perspective is for diagnosing the target scroll compression element of a target refrigeration system. The target refrigeration system is equipped with a target compressor. The target compressor has a target scroll compression element and a target compressor motor. The target scroll compression element compresses the refrigerant. The target compressor motor drives the target scroll compression element. In the method, a computer acquires target data. The target data is capable of deriving a target rate of change. The target rate of change is the rate of change of the target operating index value with respect to the target state variable. The target operating index value is related to the operation of the target compressor motor. The target state variable is the state variable of the refrigerant in the target refrigeration system. In the method, a computer maintains a judgment criterion value. In the method, the computer derives the target rate of change from the target data. In the method, the computer derives a diagnostic result for the target scroll compression element based on the target rate of change and the judgment criterion value. In the method, the computer outputs the diagnostic result.

[0038] In this configuration, the program instructs the computer to diagnose the condition of the scroll compression element based on a target rate of change that is easily affected by the wear of the scroll wrap. Therefore, abnormalities in the target compressor can be detected, allowing service personnel to accurately determine whether the compressor needs to be replaced. In turn, malfunctions such as sudden shutdowns of the target compressor can be prevented.

[0039] The program for the 18th perspective diagnoses the target scroll compression element of the target refrigeration system. The target refrigeration system is equipped with a target compressor. The target compressor has a target scroll compression element and a target compressor motor. The target scroll compression element compresses the refrigerant. The target compressor motor drives the target scroll compression element. The program causes the computer to function as an acquisition unit. The acquisition unit acquires target data. The target data is capable of deriving the target rate of change. The target data is the rate of change of the target operating index value with respect to the target state quantity. The target operating index value is related to the operation of the target compressor motor. The target state quantity is the state quantity of the refrigerant in the target refrigeration system. The program causes the computer to function as a storage unit. The storage unit is capable of holding judgment criterion values. The program causes the computer to function as a processing unit. The processing unit derives the target rate of change from the target data. The processing unit derives a diagnostic result for the target scroll compression element based on the target rate of change and the judgment criterion values. The program causes the computer to function as an output unit. The output unit outputs the diagnostic results derived by the processing unit.

[0040] In this configuration, the program instructs the computer to diagnose the condition of the scroll compression element based on a target rate of change that is easily affected by the wear of the scroll wrap. Therefore, abnormalities in the target compressor can be detected, allowing service personnel to accurately determine whether the compressor needs to be replaced. In turn, malfunctions such as sudden shutdowns of the target compressor can be prevented. [Brief explanation of the drawing]

[0041] [Figure 1] This is a schematic diagram showing the configuration of the target refrigeration unit 100 that is subject to diagnosis. [Figure 2] This is a cross-sectional view showing the structure of the target compressor 111 installed in the target refrigeration system 100. [Figure 3] This is a cross-sectional view showing the fixed scroll e1. [Figure 4] This is a cross-sectional view showing the movable scroll e2. [Figure 5] This is a cross-sectional view showing the target scroll compression element 111e. [Figure 6] This is a schematic diagram showing the configuration of the diagnostic system 90 according to the first embodiment. [Figure 7] This is a schematic diagram showing a comparison of the configurations of the target refrigeration system 100 and the normal refrigeration system 200. [Figure 8] This is a schematic diagram showing a configuration for acquiring the operating index value I, rotational speed R, first state variable S1, and second state variable S2. [Figure 9] This is a schematic diagram showing an example of a comprehensive table T of operational data stored in the database 82 of server 80. [Figure 10] This is a schematic diagram showing an example of a normal table V. [Figure 11] This is a schematic diagram showing multiple segments E for classifying records in normal table V. [Figure 12] This is a schematic diagram showing an example of a normal data DN. [Figure 13] This is a schematic diagram showing an example of extraction table U. [Figure 14] This is a schematic diagram showing multiple segments E for classifying records in extraction table U. [Figure 15] This is a schematic diagram showing an example of the target data DT. [Figure 16] This is a schematic diagram for comparing the target rate of change At and the normal rate of change An. [Figure 17] This is a schematic diagram showing an example of target data DT according to a first modification of the first embodiment. [Figure 18] This is a schematic diagram showing an example of target data DT according to a second modification of the first embodiment. [Figure 19] This is a schematic diagram showing the configuration of the diagnostic system 90 according to the second embodiment. [Figure 20] This is a schematic diagram showing the configuration of the diagnostic system 90 according to the third embodiment. [Modes for carrying out the invention]

[0042] <Target for diagnosis> Figure 1 shows the configuration of the target refrigeration system 100, which is the refrigeration system to be diagnosed. In many cases, the target refrigeration system 100 is already installed on the user's premises and is used by the user. The target refrigeration system 100 is designed to provide the user with cold heat or hot heat by circulating a refrigerant F. The target refrigeration system 100 may be configured as, for example, an air conditioner, refrigerator, freezer, water heater, or floor heating system. The target refrigeration system 100 has a heat source unit 110, a utilization unit 120, a group of connecting pipes 130, and a communication line 135.

[0043] The heat source unit 110 is for obtaining cooling or heating from a heat source. The heat source unit 110 includes a target compressor 111, a four-way switching valve 112, a heat source heat exchanger 113, a heat source fan 114, a heat source expansion valve 115, an accumulator 116, a liquid shut-off valve 117, and a gas shut-off valve 118. Note that if the heat source is not air, the heat source fan 114 may not be provided.

[0044] The utilization unit 120 is for providing the user with the cold or heat acquired by the heat source unit 110. The utilization unit 120 has a utilization heat exchanger 123 and a utilization fan 124. The connecting piping group 130 has a liquid refrigerant pipe 131 and a gaseous refrigerant pipe 132. Note that if the user does not receive the cold or heat via air, the utilization fan 124 may not be provided.

[0045] The components listed above constitute a refrigerant circuit that circulates refrigerant F.

[0046] The heat source unit 110 further includes a heat source control unit 119 and a network adapter NA. The utilization unit 120 further includes a utilization control unit 129. The heat source control unit 119, the utilization control unit 129, and the communication line 135 constitute the device control unit 109. The device control unit 109 controls the actuators of various components that constitute the refrigerant circuit. The device control unit 109 also collects data from various sensors. The various sensors include a first sensor SS1 that measures the state amount of refrigerant F in the discharge pipe 111b of the target compressor 111, and a second sensor SS2 that measures the state amount of refrigerant F in the suction pipe 111a of the target compressor 111. The network adapter NA can be connected to an external network by wired or wireless connection. The network adapter NA is connected to the device control unit 109.

[0047] Figure 2 shows the structure of the target compressor 111. The target compressor 111 is a compressor mounted on the target refrigeration system 100. The target compressor 111 has a casing 111c, a target compressor motor 111m, a target crankshaft 111s, and a target scroll compression element 111e. The casing 111c houses various parts and is provided with an intake pipe 111a and a discharge pipe 111b. The target compressor motor 111m is a three-phase AC motor that generates power to drive the target scroll compression element 111e. The target crankshaft 111s transmits the power generated by the target compressor motor 111m to the target scroll compression element 111e. The target scroll compression element 111e compresses the refrigerant F drawn in from the intake pipe 111a and discharges the compressed refrigerant F from the discharge pipe 111b.

[0048] The target scroll compression element 111e is for compressing the refrigerant F and has a fixed scroll e1 and a movable scroll e2. The fixed scroll e1 is fixed to the casing 111c. The movable scroll e2 can pivot relative to the fixed scroll e1 by power generated by the target compressor motor 111m. Multiple compression chambers e3 are formed between the fixed scroll e1 and the movable scroll e2. As the movable scroll e2 pivots, the volume of the multiple compression chambers e3 changes, and the refrigerant F is compressed.

[0049] Figure 3 shows the fixed scroll e1. The fixed scroll e1 has a planar fixed end plate e11 and a spiral fixed scroll wrap e12. Figure 4 shows the movable scroll e2. The movable scroll e2 has a planar movable end plate e21 and a spiral movable scroll wrap e22. Figure 5 shows a cross-section of the target scroll compression element 111e. Both the fixed scroll wrap e12 and the movable scroll wrap e22 are designed to form an involute curve. The fixed scroll wrap e12 and the movable scroll wrap e22 contact each other at multiple contact points e4, thereby defining multiple compression chambers e3.

[0050] Due to the prolonged orbital motion of the movable scroll e2, the fixed scroll e1 and movable scroll e2 wear down. When the fixed scroll lap e12 or movable scroll lap e22, which require precise geometric design, wears down, the contact points e4 they form become misaligned or disappear. Such abnormalities in the contact points e4 cause leakage of refrigerant F from the compression chamber e3, degrading the performance of the target compressor 111. Therefore, maintenance replacement of the target compressor 111 is performed when the target refrigeration system 100 has been in operation for a long period of time. In maintenance replacement, the old target compressor 111 installed in the target refrigeration system 100 is replaced with a new one.

[0051] <First Embodiment> (1) Overall structure Figure 6 shows the configuration of the diagnostic system 90 according to the first embodiment. The diagnostic system 90 diagnoses the quality of the target scroll compression element 111e of the target compressor 111 mounted on the target refrigeration unit 100.

[0052] The diagnostic system 90 has a terminal 10 and a server 80. The terminal 10 and the server 80 are connected to each other via a network 70. The target refrigeration unit 100 is also connected to this network 70. Furthermore, a number of operational refrigeration units 300 that have been sold to owners other than the target refrigeration unit 100 and are already in operation are also connected to the network 70.

[0053] (2) Detailed configuration (2-1) Network 70 Network 70 is a wide-area computer network. Network 70 may be physically comprised of a fiber optic network or a public switched telephone network (PSTN). Network 70 is, for example, the Internet. Alternatively, Network 70 may be a dedicated network owned by the manufacturer of the refrigeration equipment 100.

[0054] (2-2) Terminal 10 Terminal 10 is a computer owned by the manufacturer or maintenance company of the refrigeration system 100. Terminal 10 is typically carried by a service person responsible for the installation or maintenance of the refrigeration system 100. Alternatively, Terminal 10 may be located at the service center of the manufacturer of the refrigeration system 100. Terminal 10 is connected to the network 70.

[0055] Terminal 10 comprises a processing unit 11, an input unit 12, an output unit 13, a storage unit 14, and an acquisition unit 15. The processing unit 11 oversees the overall operation of terminal 10 and performs arithmetic operations, and is typically composed of a processor. The input unit 12 receives input from a service person. The input unit 12 is composed of, for example, a keyboard, mouse, touch panel, or optical reader. The output unit 13 presents output such as diagnostic results to the service person. The output unit 13 is composed of, for example, a display. The storage unit 14 is a storage area that at least temporarily holds the program that operates the processing unit 11, data received from the server 80, intermediate files generated by arithmetic operations, and other information. The storage unit 14 also stores the value of the judgment criterion value J. The judgment criterion value J will be described later. The acquisition unit 15 acquires information by communicating with the server 80 via the network 70.

[0056] (2-3) Server 80 Server 80 is a computer owned by the manufacturer of the target refrigeration unit 100. Server 80 is installed, for example, at the manufacturer's service center. Server 80 is connected to network 70. Server 80 can acquire and centrally manage operational data from numerous products connected to network 70.

[0057] The server 80 comprises a processing unit 81, a database 82, a storage unit 83, and an acquisition unit 84. The processing unit 81 oversees the overall operation of the server 80 and performs arithmetic operations, and is typically composed of a processor. The database 82 stores operating data sent from the target refrigeration unit 100 and the operating refrigeration unit 300 via the network 70. The storage unit 83 is a storage area that at least temporarily holds the program that operates the processing unit 81, data received via the network 70, intermediate files generated by arithmetic operations, and other information. Furthermore, the storage unit 83 holds normal data DNs that have been previously acquired from the normal refrigeration unit 200. The normal refrigeration unit 200 and normal data DNs will be described later. The acquisition unit 84 acquires information by communicating with other devices via the network 70.

[0058] (2-4) Target refrigeration unit 100 As mentioned above, the target refrigeration unit 100 is subject to diagnosis by the diagnostic system 90, is already installed on the user's premises, and is in use by the user. The diagnostic system 90 diagnoses the condition of the target scroll compression element 111e of the target compressor 111 installed in the target refrigeration unit 100, thereby assisting a service person in determining whether or not it is necessary to replace the target compressor 111 with a new one.

[0059] The target refrigeration unit 100 is connected to the network 70. The operating data of the target refrigeration unit 100 is transmitted to the server 80 via the network 70 and stored in the database 82.

[0060] (2-5) Refrigeration equipment in operation 300 The numerous operational refrigeration units 300 are typically manufactured by the same company as the target refrigeration unit 100, and most of them have been sold to owners other than the target refrigeration unit 100. The operational refrigeration units 300 are already installed on the user's premises and have commenced operation. All operational refrigeration units 300 are connected to the network 70. Operational data from the operational refrigeration units 300 is transmitted to the server 80 via the network 70 and stored in the database 82.

[0061] (2-6) Normal refrigeration equipment 200 The storage unit 83 of the server 80 stores normal data DN related to the operating history of the normal refrigeration unit 200. The normal refrigeration unit 200 is different from the target refrigeration unit 100 and the operating refrigeration unit 300, and is typically a brand new refrigeration unit that has not yet been sold to a user and is stored in the manufacturer's warehouse. Therefore, the normal refrigeration unit 200 is a product in which all components are expected to function normally. The normal data DN is referenced in the diagnosis of the target refrigeration unit 100 by the diagnostic system 90.

[0062] The manufacturer obtains normal data DN by conducting operational tests on one or more normal refrigeration units 200. Next, the manufacturer irreversibly disassembles or takes apart the tested normal refrigeration units 200 and verifies that the components are in good condition. Therefore, once the manufacturer has confirmed that the components are in good condition, and the reliability of the normal data DN is confirmed, the normal refrigeration unit 200 is no longer in an operational state.

[0063] Figure 7 shows a comparison of the configurations of the target refrigeration system 100 and the normal refrigeration system 200. The target refrigeration system 100 is equipped with the target compressor 111 that is subject to maintenance and replacement, and the device control unit 109 that controls the target compressor 111. The target compressor 111 houses the target scroll compression element 111e, the target compressor motor 111m that drives the target scroll compression element 111e, and the target crankshaft 111s that transmits the power generated by the target compressor motor 111m to the target scroll compression element 111e.

[0064] The normal refrigeration unit 200 has the same configuration as the target refrigeration unit 100. The normal refrigeration unit 200 is equipped with a normal compressor 211 and a device control unit 209 that controls the normal compressor 211. The normal compressor 211 houses a normal scroll compression element 211e, a normal compressor motor 211m that drives the normal scroll compression element 211e, and a normal crankshaft 211s that transmits the power generated by the normal compressor motor 211m to the normal scroll compression element 211e. As mentioned above, the condition of the normal scroll compression element 211e and the normal compressor motor 211m was confirmed to be normal in the prior operational tests conducted by the manufacturer. Therefore, at the time the normal data DN was acquired, the normal scroll compression element 211e was not worn.

[0065] Although not shown in Figure 7, the operating refrigeration unit 300 has the same configuration as the target refrigeration unit 100 and the normal refrigeration unit 200.

[0066] (3) Operating data In the configuration shown in Figure 6, the target refrigeration unit 100 and the operating refrigeration unit 300 periodically acquire their own operating data and transmit it to the server 80. The operating data includes four items. The first item is the first state quantity S1 of the refrigerant F. The second item is the second state quantity S2 of the refrigerant F. The third item is the rotational speed R of the compressor motor. The fourth item is the operating index value I of the compressor motor.

[0067] (3-1) First state variable S1 and second state variable S2 As shown in the example of the target refrigeration system 100 in Figure 1, the refrigeration system is equipped with a first sensor SS1 and a second sensor SS2 for acquiring the state of the refrigerant F. The first sensor SS1 is located near the discharge pipe of the compressor and acquires the first state quantity S1 of the refrigerant. The second sensor SS2 is located near the suction pipe of the compressor and acquires the second state quantity S2 of the refrigerant.

[0068] An example of a state variable is the pressure of the refrigerant F. The first sensor SS1 may acquire the discharge pressure Po, which is the pressure of the refrigerant F discharged from the compressor, as the first state variable S1. The second sensor SS2 may acquire the suction pressure Pi, which is the pressure of the refrigerant F drawn in by the compressor, as the second state variable S2.

[0069] Another example of a state variable is the temperature of the refrigerant F. The discharge pressure Po of the refrigerant F can be converted to the condensation temperature Tc of the refrigerant F in the condenser. Therefore, the first sensor SS1 can obtain the condensation temperature Tc of the refrigerant F as the first state variable S1. The suction pressure Pi of the refrigerant F can be converted to the evaporation temperature Te of the refrigerant F in the evaporator. Therefore, the second sensor SS2 can obtain the evaporation temperature Te of the refrigerant F as the second state variable S2.

[0070] In this embodiment, the first state variable S1 is the condensation temperature Tc, and the second state variable S2 is the evaporation temperature Te. In this case, the units of the first state variable S1 and the second state variable S2 are, for example, [℃: degrees Celsius].

[0071] In this specification, the first state variable S1 and the second state variable S2 are collectively referred to as state variable S. In the target refrigeration system 100, state variable S, the first state variable S1, and the second state variable S2 are specifically referred to as target state variable St, target first state variable S1t, and target second state variable S2t, respectively. In addition, in the normal refrigeration system 200, state variable S, the first state variable S1, and the second state variable S2 are specifically referred to as normal state variable Sn, normal first state variable S1n, and normal second state variable S2n, respectively.

[0072] (3-2) Rotation speed R In this book, when the term "rotational speed" is used, it refers to the number of rotations per unit time. The rotational speed R of a compressor motor means, for example, the number of times the rotor of the compressor motor rotates per second. The control units of the target refrigeration unit 100, the normal refrigeration unit 200, and the operating refrigeration unit 300 each adjust the rotational speed R of the compressor motor by inverter control. Therefore, the control units can know the rotational speed R of the compressor motor. The unit of rotational speed R is, for example, [Hz: Hertz] or [rps: revolutions per second].

[0073] In this specification, the rotational speed R of the target compressor motor 111m in the target refrigeration system 100 is specifically referred to as the target rotational speed Rt. Similarly, the rotational speed R of the normal compressor motor 211m in the normal refrigeration system 200 is specifically referred to as the normal rotational speed Rn.

[0074] (3-3) Performance Index Value I A compressor motor exhibits an operating index value I related to its operation. The operating index value I is, for example, a quantity relating to the current flowing through the compressor motor. Specifically, the operating index value I can be a specific frequency component contained in the current flowing through the compressor motor. In this case, the unit of the operating index value I is, for example, [A: amperes].

[0075] In this embodiment, the operating index value I is the component in the current flowing through the compressor motor that has a frequency corresponding to the rotational speed R. For example, if the rotational speed R of the compressor motor is 80 Hz (in other words, 80 rps), the operating index value I represents the magnitude of the 80 Hz component in the current flowing through the compressor motor.

[0076] The magnitude of the operating index value I depends on the rotational speed R, the first state variable S1, the second state variable S2, and the degree of wear Q of the scroll compression element. In other words, the operating index value I can be expressed by the following formula.

[0077] [Function of the performance index value I]

[0078]

number

[0079] Here, f represents a function. Therefore, the severity of the wear Q of the scroll compression element can be determined using four quantities: the operating index value I, the rotational speed R, the first state variable S1, and the second state variable S2.

[0080] In this specification, the operating index value I of the target compressor motor 111m in the target refrigeration system 100 is specifically referred to as the target operating index value It. Similarly, the operating index value I of the normal compressor motor 211m in the normal refrigeration system 200 is specifically referred to as the normal operating index value In.

[0081] Furthermore, in this specification, the degree of wear Q of the target scroll compression element 111e in the target refrigeration unit 100 is specifically referred to as the target degree of wear Qt. Also, the degree of wear Q of the normal scroll compression element 211e in the normal refrigeration unit 200 is specifically referred to as the normal degree of wear Qn.

[0082] Next, as an example, the method for measuring the target operating index value It of the target refrigeration system 100 will be explained. As shown in Figure 8, the target compressor motor 111m is a three-phase AC motor and has three wirings: U-phase wiring Wu, V-phase wiring Wv, and W-phase wiring Ww. The U-phase current iu, V-phase current iv, and W-phase current iw, which are AC currents supplied by the inverter circuit INV of the heat source control unit 119, flow through the U-phase wiring Wu, V-phase wiring Wv, and W-phase wiring Ww, respectively. The heat source control unit 119 controls the magnitudes of the U-phase current iu, V-phase current iv, and W-phase current iw so that the target compressor motor 111m can rotate at the target rotational speed Rt. These U-phase current iu, V-phase current iv, and W-phase current iw are measured by the U-phase current sensor SSu, the V-phase current sensor SSv, and the W-phase current sensor SSw, respectively. The measured values ​​are input to the heat source control unit 119.

[0083] The alternating currents, iu (U-phase current), iv (V-phase current), and iw (W-phase current), are expressed by the following formulas.

[0084] [U phase current iu]

[0085]

number

[0086] [V phase current iv]

[0087]

number

[0088] [W phase current iw]

[0089]

number

[0090] Here, t represents time, ω represents the electrical angular frequency, and Iu, Iv, and Iw represent the current amplitudes of the U-phase, V-phase, and W-phase, respectively. The heat source control unit 119 first converts the values ​​of the U-phase current iu, V-phase current iv, and W-phase current iw into current amplitudes Iu, Iv, and Iw. Next, the heat source control unit 119 calculates the current vector amplitude Ia, which is defined by the following formula.

[0091] [Current vector amplitude Ia]

[0092]

number

[0093] The value of the current vector amplitude Ia fluctuates relatively large at the frequency corresponding to the target rotational speed Rt. The heat source control unit 119 performs a frequency analysis of the current vector amplitude Ia and calculates the target operating index value It as the operating index value I, which is the frequency component corresponding to the rotational speed R contained in the current vector amplitude Ia.

[0094] (3-4) Continuous storage of operating data of the target refrigeration unit 100 and the refrigeration unit 300 currently in operation. In the configuration shown in Figure 6, the server 80 installed at the manufacturer's service center is constantly running and receives operating data transmitted via the network 70 from the target refrigeration unit 100 and numerous other operating refrigeration units 300, which are the company's own products, in the acquisition unit 84. The server 80 then stores the operating data received by the acquisition unit 84 in the database 82. The processing unit 81 of the server 80 performs this continuous storage by executing a dedicated storage program.

[0095] Figure 9 shows the comprehensive table T of the operating data stored in database 82. Each row in comprehensive table T constitutes one record corresponding to one acquisition of operating data obtained from a certain product. Each column in comprehensive table T constitutes fields F1 to F7. Field F1 indicates the record number. The record number is an identifier for managing the operating data and is assigned to each record in comprehensive table T in a non-repeating manner. Field F2 indicates the refrigeration unit ID. The refrigeration unit ID is assigned to each of the target refrigeration unit 100 and the numerous operating refrigeration units 300 in a non-repeating manner. The refrigeration unit ID of the target refrigeration unit 100 is stored, for example, in the unit control unit 109 of the target refrigeration unit 100, and is also attached to the target refrigeration unit 100 as a label or mark. Server 80 receives the refrigeration unit ID transmitted from the unit control unit 109 of the target refrigeration unit 100. Field F3 indicates the data acquisition date and time when Server 80 received the record. Fields F4 to F7 are the contents of the operating data. Field F4 indicates the operation index value I. Field F5 represents the rotational speed R. Field F6 represents the first state variable S1. Field F7 represents the second state variable S2.

[0096] (3-5) Preset of operating data for the normal refrigeration unit 200 As mentioned above, the storage unit 83 of the server 80, which constitutes the diagnostic system 90 in Figure 6, has the normal data DN obtained from the operational test of the normal refrigeration unit 200 pre-stored. This normal data DN is also generated from the same information as the comprehensive table T, which consists of the operating data of the target refrigeration unit 100 and the refrigeration unit 300 in operation.

[0097] In order to obtain normal data DN, the manufacturer obtains the normal table V shown in Figure 10 by conducting operational tests on one or more normal refrigeration units 200. This normal table V is stored in database 82.

[0098] Normal Table V consists of fields H1 to H7. Fields H1 to H7 correspond to the contents of fields F1 to F7 of the General Table T, respectively. Fields H4 to H7 are operating data for the normal refrigeration system 200. Field H4 shows the normal operating index value In, which is the operating index value I of the normal compressor motor 211m. Field H5 shows the normal rotational speed Rn, which is the rotational speed of the normal compressor motor 211m. Field H6 shows the normal first state quantity S1n, which is the condensation temperature Tc of the refrigerant F of the normal refrigeration system 200. Field H7 shows the normal second state quantity S2n, which is the evaporation temperature Te of the refrigerant F of the normal refrigeration system 200.

[0099] The manufacturing company uses a conversion program on server 80 to organize the information in normal table V into a convenient normal data DN format. First, as shown in Figure 11, the conversion program sets up multiple ranks according to the magnitude of the normal rotation speed Rn and the normal second state variable S2n. In Figure 11, the horizontal axis representing the normal rotation speed Rn is divided into multiple ranks X1 to X9, and the vertical axis representing the normal second state variable S2n is divided into multiple ranks Y1 to Y8. As a result, the entire area is divided into multiple segments E. Next, the conversion program classifies all records of normal table V, represented by dots D in Figure 11, into one of the segments E according to the values ​​of the normal rotation speed Rn and normal second state variable S2n contained in each record. For multiple records belonging to the same segment E, the values ​​of the normal rotation speed Rn that each record possesses are concentrated within a predetermined range defined by one of the ranks X1 to X9. Similarly, for multiple records belonging to the same segment E, the values ​​of the normal second state variable S2n that each record possesses are concentrated within a predetermined range defined by one of the ranks Y1 to Y8.

[0100] Figure 12 shows the records included in each segment E as graphs. The vertical axis of each graph is the normal operating index value In. The horizontal axis of each graph is the normal first state quantity S1n, which is the condensation temperature Tc of the refrigerant F of the normal refrigeration system 200. The multiple dots D in each graph represent records belonging to the same segment E. The multiple dots D in each graph are connected by an approximate line. The approximate line is a linear function of the normal first state quantity S1n and has a slope. The slope represents the change in the normal operating index value In that the approximate line experiences when the normal first state quantity S1n changes by a unit amount UX. Therefore, the slope of the approximate line represents the normal rate of change An, which is the rate of change of the normal operating index value In with respect to the normal first state quantity S1n. The normal rate of change An functions as an index related to the normal wear degree Qn of the normal scroll compression element 211e of the normal refrigeration system 200.

[0101] The conversion program generates normal data DN by associating the records classified for each segment E with the normal rate of change An of the approximate straight line for that segment E. The conversion program stores the normal data DN, for example, in a portion of the memory area of ​​the storage unit 83.

[0102] (4) Diagnostic procedure Next, the diagnostic procedure using the diagnostic system 90 shown in Figure 6 will be explained. The processing unit 81 of the server 80 and the processing unit 11 of the terminal 10 can each perform the diagnosis according to the following procedure by executing their respective dedicated diagnostic programs.

[0103] (4-1) First step: Designation of the target refrigeration device 100 A service person responsible for maintaining the target refrigeration unit 100 uses terminal 10 to identify the target refrigeration unit 100 that is about to be diagnosed. For example, the service person goes to the location where the target refrigeration unit 100 is installed and finds out the refrigeration unit ID of the target refrigeration unit 100 from the label or markings attached to the refrigeration unit 100. Then, the service person enters that refrigeration unit ID into the input unit 12 of the terminal 10 that they are carrying. After that, the service person uses the input unit 12 of terminal 10 to give a command to the diagnostic system 90 to start the diagnosis.

[0104] (4-2) Second step: Creation of extraction table U for target refrigeration device 100 The acquisition unit 84 of the server 80 receives the refrigeration unit ID of the target refrigeration unit 100 and an instruction to start the diagnosis. The server 80 extracts only the records containing the presented refrigeration unit ID of the target refrigeration unit 100 from the records stored in the comprehensive table T of the database 82. Figure 13 is an example of an extraction table U composed of the extracted records. The server 80 expands this extraction table U into, for example, a part of the area of ​​the storage unit 83.

[0105] Extraction table U has fields G1 to G7. Fields G1 to G7 correspond to the contents of fields F1 to F7 of the general table T, respectively. Fields G4 to G7 contain the operating data of the target refrigeration system 100. Field G4 shows the target operating index value It, which is the operating index value I of the target compressor motor 111m. Field G5 shows the target rotational speed Rt of the target compressor motor 111m. Field G6 shows the target first state quantity S1t, which is the condensation temperature Tc of the refrigerant F of the target refrigeration system 100. Field G7 shows the target second state quantity S2t, which is the evaporation temperature Te of the refrigerant F of the target refrigeration system 100.

[0106] Server 80 checks whether the contents of the records contained in the extraction table U of the storage unit 83 satisfy, for example, the following conditions:

[0107] - Has a sufficiently long period of time passed since the target refrigeration unit 100 was first connected to the network 70? - Is there a sufficient number of recent records for the target refrigeration unit 100? - In recent records, are the values ​​of the function arguments (e.g., the target first state variable S1t) of the operational index value I sufficiently dispersed to allow for diagnosis?

[0108] If the conditions are not met, the server 80 determines that the record inspection result is unsuccessful and sends an error command to the terminal 10. Upon receiving the error command, the terminal 10 displays an error message indicating "unable to diagnose" on the output unit 13. In this case, the diagnosis by the diagnostic system 90 ends at this point.

[0109] On the other hand, if the conditions are met, server 80 determines that the record inspection result is acceptable and proceeds to the third step.

[0110] (4-3) Third step: Creation of target data DT The server 80 generation program generates target data DT by further extracting multiple records from the records that make up the extraction table U. Target data DT is data from which the target rate of change At can be derived. The target rate of change At is the rate of change of the target operating index value It with respect to the target first state variable S1t. The procedure for generating target data DT is described below.

[0111] First, the generation program extracts new records from the extraction table U. A new record means that the value of the data acquisition date and time (field G3) falls within a specified period from the current time.

[0112] Next, as shown in Figure 14, the generation program classifies the new records in the same way that the conversion program classified the records of the normal refrigeration unit 200 into multiple segments E. Specifically, the generation program sets multiple ranks according to the magnitude of the target rotational speed Rt and the target second state variable S2t. In Figure 14, the horizontal axis representing the target rotational speed Rt is divided into multiple ranks X1 to X9, and the vertical axis representing the target second state variable S2t is also divided into multiple ranks Y1 to Y8. As a result, the entire region is divided into multiple segments E. Next, the generation program classifies all the records represented by dot D in Figure 14 into one of the segments E according to the values ​​of the target rotational speed Rt and the target second state variable S2t contained in each record. For multiple records belonging to the same segment E, the values ​​of the target rotational speed Rt that each record possesses are concentrated within a predetermined range defined by one of the ranks X1 to X9. Similarly, for multiple records belonging to the same segment E, the values ​​of the target second state variable S2t that each record possesses are concentrated within a predetermined range defined by any of the ranks Y1 to Y8.

[0113] Next, the generation program selects one selected segment Eu from among many segments E as the information source for generating the target data DT. In Figure 14, the selected segment Eu corresponds to ranks X3 and Y5. The selection criterion is, for example, the segment E with the largest number of records. It should be noted that, considering various circumstances, some of the segments E may be designated as prohibited segments, and a constraint may be imposed that the selected segment Eu cannot be selected from the prohibited segments.

[0114] Figure 15 shows the records belonging to the selected segment Eu, generated as target data DT. The records are represented as a graph. The vertical axis of the graph is the target operating index value It. The horizontal axis of the graph is the target first state variable S1t, which is the condensation temperature Tc of the refrigerant F of the target refrigeration system 100. Multiple dots D indicate records belonging to the selected segment Eu. Multiple dots D are connected by an approximate line. The approximate line is a linear function of the target first state variable S1t and has a slope. The slope represents the change in the target operating index value It that the approximate line experiences when the target first state variable S1t changes by a unit amount UX. Therefore, the slope of the approximate line represents the target rate of change At, which is the rate of change of the target operating index value It with respect to the target first state variable S1t. The target rate of change At functions as an index related to the target wear degree Qt of the target scroll compression element 111e of the target refrigeration system 100.

[0115] The generation program generates target data DT by associating records belonging to the selected segment Eu with the target rate of change At of the approximation line. The generation program stores the target data DT in a portion of the memory area of ​​the storage unit 83, for example.

[0116] (4-4) Step 4: Selection of a graph of normal data DN The processing unit 81 of the server 80 shown in Figure 6 selects a selection segment Ev corresponding to ranks X3 and Y5 for the normal data DN shown in Figure 11, because the selection segment Eu selected when creating the target data DT in the third step corresponds to ranks X3 and Y5. Next, from among the multiple graphs of the normal data DN shown in Figure 12, it selects only one graph that corresponds to the selection segment Ev.

[0117] (4-5) Step 5: Transfer of target change rate At and normal change rate An As shown in Figure 6, the server 80 transmits the target rate of change At, obtained in the third step, to the acquisition unit 15 of the terminal 10. Furthermore, the server 80 transmits the normal rate of change An, shown by one of the selected graphs, to the terminal 10 in the fourth step.

[0118] (4-6) Step 6: Quality determination Figure 16 shows the target change rate At and the normal change rate An, which are compared in determining the quality of the target scroll compression element 111e.

[0119] The verifiers of the technology of this disclosure discovered that as the degree of wear Qt of the target scroll compression element 111e of the target refrigeration unit 100 deteriorates, the magnitude of the rate of change At of the target refrigeration unit 100 decreases and deviates from the magnitude of the normal rate of change An. In other words, the rate of change At functions as an indicator related to the degree of wear Qt of the target scroll compression element 111e of the target refrigeration unit 100, and the normal rate of change An functions as an indicator related to the normal degree of wear Qn of the normal scroll compression element 211e of the normal refrigeration unit 200.

[0120] Based on this finding, the verifiers discovered that it is possible to estimate the degree of wear Qt of the target scroll compression element 111e using the comparison results of the target rate of change At and the normal rate of change An, thereby determining whether or not the target compressor 111 needs to be replaced with a new one.

[0121] The memory unit 14 of the terminal 10 shown in Figure 6 stores the value of the judgment criterion value J. The judgment criterion value J is a numerical value between 0.0 and less than 1.0. For example, the judgment criterion value J is 0.5. The smaller the value of the judgment criterion value J, the more the judgment will allow for a severe degree of target wear Qt on the target scroll compression element 111e. On the other hand, the larger the value of the judgment criterion value J, the more the judgment will be strict, allowing only a slight degree of target wear Qt on the target scroll compression element 111e. The processing unit 11 of the terminal 10 calculates whether the following judgment formula is true or false in order to derive a diagnostic result for the target scroll compression element 111e.

[0122] [Judgment formula]

[0123]

number

[0124] Here, |At| is the magnitude (absolute value) of the target rate of change At, and |An| is the magnitude (absolute value) of the normal rate of change An.

[0125] If this determination formula is true, it means that the target rate of change At does not deviate significantly from the normal rate of change An, and the processing unit 11 determines that replacement of the target compressor 111 is unnecessary. At this time, the output unit 13 of the terminal 10 outputs a message indicating that the target scroll compression element 111e is "normal" as a diagnostic result. With this, the diagnosis by the diagnostic system 90 is completed.

[0126] On the other hand, if this determination formula is false, it means that the target rate of change At deviates significantly from the normal rate of change An, and the processing unit 11 determines that the target scroll compression element 111e is severely worn and that the target compressor 111 needs to be replaced. At this time, the output unit 13 of the terminal 10 outputs a message indicating that the target scroll compression element 111e is "abnormal" as a diagnostic result. With this, the diagnosis by the diagnostic system 90 is completed.

[0127] (5) Characteristics (5-1) The diagnostic system 90 diagnoses the target scroll compression element 111e by comparing the target rate of change At, obtained from the target refrigeration unit 100, with the normal rate of change An, obtained from a normally operating refrigeration unit 200. Therefore, a highly reliable diagnosis can be performed.

[0128] (5-2) The multiple target rotational speed Rt values ​​included in the target data DT, and the multiple normal rotational speed Rn values ​​included in the normal data DN, are all approximate. Therefore, a more accurate diagnosis of the target scroll compression element 111e can be performed.

[0129] (5-3) The target operating index value It is the frequency component in the current flowing through the target compressor motor 111m that corresponds to 1 times the target rotational speed Rt. This allows for accurate diagnosis of the target scroll compression element 111e.

[0130] (5-4) The target state variable St includes at least one of the evaporation temperature Te or condensation temperature Tc of the refrigerant F. Therefore, since the target state variable St is a value related to the behavior of the refrigerant F, which is sensitive to wear of the target scroll compression element 111e, the condition of the target scroll compression element 111e can be diagnosed with high accuracy.

[0131] (5-5) The diagnostic system 90 comprises a terminal 10 and a server 80. Therefore, data regarding the behavior of the target refrigeration unit 100 and the normal refrigeration unit 200 can be stored in the ample storage capacity of the server 80, enabling highly accurate diagnosis of the target scroll compression element 111e.

[0132] (6) Variant 6) First variation (variation of the judgment formula) As mentioned above, the function for the performance index value I has four arguments, as shown in the formula below.

[0133] [Function of the performance index value I]

[0134]

number

[0135] In the embodiment described above, by focusing on the dependence of the operating index value I on a single quantity called the first state variable S1 among the four arguments, the target data DT that can be represented in the graph of Figure 15 is obtained. The first state variable S1 is the condensation temperature Tc of the refrigerant F.

[0136] Alternatively, the target data DT may be obtained by focusing on the dependence of the operating index value I on a single quantity called the second state variable S2. The second state variable S2 is the evaporation temperature Te of the refrigerant F.

[0137] Figure 17 shows an example of target data DT drawn as an approximate straight line in a two-dimensional space defined by the target operating index value It and the second state variable S2. The slope of the approximate straight line represents the normal rate of change An, which is the rate of change of the normal operating index value In with respect to the normal second state variable S2n. In Figure 17, the normal rate of change An has a negative value. The processing unit 11 of terminal 10 calculates whether the following determination formula is true or not, similar to the embodiment described above.

[0138] [Judgment formula]

[0139]

number

[0140] Here, |At| is the magnitude (absolute value) of the target rate of change At, so even if the target rate of change At has a negative value, |At| can take a positive value. |An| is the magnitude (absolute value) of the normal rate of change An, so even if the normal rate of change An has a negative value, |An| can take a positive value.

[0141] The verifiers of the technology disclosed herein discovered that even when the normal rate of change An has a negative value, as the target wear degree Qt of the target scroll compression element 111e deteriorates, the magnitude of the target rate of change At of the target refrigeration device 100 decreases, deviating from the magnitude of the normal rate of change An |An|. Therefore, by this method as well, it is possible to estimate the target wear degree Qt of the target scroll compression element 111e and determine whether or not the target compressor 111 needs to be replaced with a new one.

[0142] (6-2) Second variation (variation of judgment method) In the embodiment described above, by focusing on the dependence of the operating index value I on a single quantity called the first state variable S1 among the four arguments, the target data DT that can be represented by the graph shown in Figure 15 is obtained.

[0143] The graph in Figure 15 is drawn as a straight line in a two-dimensional space, representing the target operating index value It and the first state variable S1. From this graph of target data DT, the target rate of change At, which corresponds to the slope of the straight line, can be obtained as a quantity related to the target wear degree Qt.

[0144] Alternatively, by focusing on the dependence of the action index value I on two arguments, a graph can be obtained that represents the target data DT plotted in three-dimensional space. Figure 18 shows an example of the target data DT plotted as a surface in three-dimensional space defined by the target action index value It, the first state variable S1, and the second state variable S2.

[0145] The target rate of change At calculated in this modified example is the rate of change of the target operating index value It with respect to the target first state variable S1t and the target second state variable S2t. The target rate of change At can be said to be a two-dimensional vector with two elements. The magnitude |At| of the target rate of change At, which is a two-dimensional vector, can be determined by the following formula.

[0146] [Magnitude of the rate of change of the target, which is a 2D vector]

[0147]

number

[0148] Here, the first element of the target rate of change At is the target first rate of change At1. The target first rate of change At1 is the rate of change of the target operating index value It with respect to the target first state variable S1t. The second element of the target rate of change At is the target second rate of change At2. The target second rate of change At2 is the rate of change of the target operating index value It with respect to the target second state variable S2t.

[0149] Similar to the embodiment described above, if the following determination expression is true, the output unit 13 of the terminal 10 may output a message indicating that the target scroll compression element 111e is "normal" as a diagnostic result.

[0150] [Judgment formula]

[0151]

number

[0152] Alternatively, a method can be used that does not calculate the magnitude |At| of the target rate of change At, which is a two-dimensional vector. In this case, instead of the judgment formula described above, the output unit 13 of the terminal 10 will output a message indicating that the target scroll compression element 111e is "normal" as a diagnostic result if both of the following two judgment formulas are true.

[0153] [First judgment formula]

[0154]

number

[0155] [Second judgment formula]

[0156]

number

[0157] Here, the first element of the two-dimensional normal rate of change An is the normal first rate of change An1. The normal first rate of change An1 is the rate of change of the normal operating index value In with respect to the normal first state variable S1n. The second element of the two-dimensional normal rate of change An is the normal second rate of change An2. The normal second rate of change An2 is the rate of change of the target operating index value It with respect to the target second state variable S2t. The first judgment criterion value J1 and the second judgment criterion value J2 are both values ​​greater than or equal to 0.0 and less than 1.0. The first judgment criterion value J1 and the second judgment criterion value J2 may be the same value.

[0158] In this configuration, the state variable S is two-dimensional and includes a first state variable S1 and a second state variable S2. Therefore, more accurate diagnosis of scroll compression elements can be performed.

[0159] (6-3) Third modified example (variation in the number of target rotational speeds Rt) In the embodiment described above, only the dot D contained in a single segment E is treated as the target data DT. This is because, in the third step, the records extracted from the extraction table U correspond to the dot D that corresponds to one rank of the target rotation speed Rt and one rank of the target second state variable S2t.

[0160] Alternatively, when creating the target data DT, the target data DT may be formed from dots D contained in multiple segments E. In this case, the number of dots D will be equal to the number of segments E considered. Alternatively, the diagnosis can be made by calculating |At| / |An| on the right-hand side of the judgment formula, deriving their average value, and then comparing that average value with the judgment criterion value J.

[0161] (6-4) Fourth modified example (variation of operating index value I) In the above-described embodiment, the operating index value I is, for example, a quantity relating to the current flowing through the compressor motor, specifically the magnitude of a particular frequency component included in the current flowing through the compressor motor. The operating index value I is obtained by frequency analysis of the current vector amplitude Ia. The current vector amplitude Ia is calculated from the U-phase current iu, the V-phase current iv, and the W-phase current iw. Alternatively, the operating index value I may be a quantity other than those described above.

[0162] For example, the operating index value I of a compressor motor can be the higher-order frequency components of the current flowing through the compressor motor. In this case, the operating index value I is the magnitude of the component whose frequency corresponds to an integer multiple of the rotational speed R. For example, the operating index value I may be the frequency component corresponding to twice the rotational speed R, obtained by frequency analysis of the current vector amplitude Ia. Alternatively, the operating index value I may be the frequency component corresponding to three times the rotational speed R, obtained by frequency analysis of the current vector amplitude Ia.

[0163] Alternatively, the operating index value I may be derived from at least one of the U-phase current iu, V-phase current iv, and W-phase current iw without using the current vector amplitude Ia. Alternatively, in the process of deriving the operating index value I, the d-axis current and q-axis current obtained by coordinate transformation of the U-phase current iu, V-phase current iv, and W-phase current iw based on the angle of the magnetic pole position may be used, or the M-axis current and T-axis current obtained by coordinate transformation of the U-phase current iu, V-phase current iv, and W-phase current iw based on the direction of the primary magnetic flux may be used.

[0164] Alternatively, the target operating index value It for the compressor motor may be a value related to the voltage or power applied to the compressor motor. Furthermore, it may be the magnitude of a component of the voltage or power corresponding to a specific frequency.

[0165] Alternatively, the compressor motor's operating index value I may be a value relating to vibrations generated by the operation of the compressor motor. For example, the operating index value I may be a signal representing the magnitude of vibrations obtained from a vibration sensor installed on the compressor casing. Furthermore, it may be the magnitude of a component corresponding to a specific frequency within the signal representing the magnitude of vibrations.

[0166] (6-5) Fifth variation (variations of state variables) In the above embodiment, the first state variable S1 is the condensation temperature Tc of the refrigerant F, and the second state variable S2 is the evaporation temperature Te of the refrigerant F. Alternatively, the first state variable S1 may be the discharge pressure Po of the refrigerant F, and the second state variable S2 may be the suction pressure Pi of the refrigerant F. In this case, the units of the first state variable S1 and the second state variable S2 are, for example, [MPa: megapascals].

[0167] Furthermore, in the above embodiment, two types of state variables are used: a first state variable S1 and a second state variable S2. Alternatively, only a single state variable may be used. For example, the state variable may be the difference between the discharge pressure Po and the suction pressure Pi of the refrigerant F. Or, the state variable may be the ratio of the discharge pressure Po and the suction pressure Pi of the refrigerant F.

[0168] (6-6) Sixth modified example (variation in the storage location of the judgment criterion value J) In the embodiment described above, the value of the judgment criterion value J is stored in the storage unit 14 of the terminal 10 shown in Figure 6. Alternatively, the value of the judgment criterion value J may be stored in the server 80. For example, the value of the judgment criterion value J may be stored in the storage unit 83 of the server 80. In this case, in the fifth step, the server 80 may transmit the judgment criterion value J to the terminal 10 in addition to the target rate of change At and the normal rate of change An.

[0169] (6-7) Seventh variation (Variations in the data format of normal data DN) In the embodiment described above, the normal data DN stored in the storage unit 83 of the server 80 is a plurality of graphs. Each graph contains a plurality of dots D, which are represented by pairs of normal operation index value In and normal first state variable S1n. Alternatively, the normal data DN may consist of only one normal rate of change An value corresponding to each graph.

[0170] After obtaining the normal table V, the manufacturer uses a conversion program on the server 80 to convert the normal table V into normal data DN. At this time, the conversion program may convert multiple dots D into a single normal change rate An, and then store that normal change rate An as normal data DN in the storage unit 83.

[0171] This configuration makes it possible to reduce the amount of normal data DN stored in the storage unit 83 of the server 80.

[0172] To match the format of the normal data DN, the target data DT may also contain only one target rate of change At, which corresponds to the graph.

[0173] (6-8) Variation 8 (Consideration of product type) In the above-described embodiment, the general table T and the normal table V have fields for record number, refrigeration device ID, data acquisition date and time, operation index value I, rotational speed R, first state variable S1, and second state variable S2. Alternatively, the general table T and the normal table V may further have fields relating to the type of refrigeration device or compressor.

[0174] With this configuration, by performing appropriate filtering, the normal data DN can be composed of operating data from a normal refrigeration unit 200 of the same model as the target refrigeration unit 100, or from operating data from a normal compressor 211 of the same model as the target compressor 111. Therefore, since the target data DT and the normal data DN have commonalities in the refrigeration unit models they assume, the diagnostic system 90 can provide more accurate diagnostic results.

[0175] <Second Embodiment> (1) Overall structure Figure 19 shows the configuration of the diagnostic system 90 according to the second embodiment. The configuration of this embodiment differs from that of the first embodiment in that the network 70 is not involved.

[0176] The diagnostic system 90 of this embodiment is configured as a terminal 10 carried by a service person. The terminal 10 is wired to the target refrigeration unit 100 at the installation location of the target refrigeration unit 100. Normal data DN is stored in the storage unit 14 of the terminal 10.

[0177] (2) Diagnostic procedure (2-1) First step: Designation of the target refrigeration device 100 The service person responsible for maintaining the target refrigeration unit 100 connects the terminal 10 to the target refrigeration unit 100 via a wired connection. The service person uses the input unit 12 of the terminal 10 to give a command to the diagnostic system 90 to start the diagnosis.

[0178] (2-2) Second step: Acquisition of operating data for the target refrigeration unit 100 The service person keeps the target refrigeration unit 100 running for a while. During this time, the operating data of the target refrigeration unit 100 is accumulated in a portion of the memory area 14 of the terminal 10. The operating data accumulated in the memory area 14 is equivalent to the content of the extraction table U shown in Figure 13.

[0179] (2-3) Third step: Stopping the acquisition of operating data The processing unit 11 determines whether there has been a significant change in the function argument of the target operation index value It in the records that make up the extraction table U of accumulated operating data, to the extent that a diagnosis can be performed. The argument whose change is examined is, for example, the target first state variable S1t. If the processing unit 11 determines that there has been a sufficiently large change in the value of the target first state variable S1t, the terminal 10 stops receiving operating data from the target refrigeration unit 100.

[0180] On the other hand, if no significant change is observed in the value of the target first state variable S1t even after a predetermined period has elapsed since the start of the diagnosis, terminal 10 stops receiving operating data from the target refrigeration unit 100 and displays an error message indicating "diagnosis impossible" on output unit 13. In this case, the diagnosis by the diagnostic system 90 ends at this point.

[0181] (2-4) Step 4: Quality determination The processing unit 11 calculates the target rate of change At based on the target data DT obtained from the extraction table U. Furthermore, the processing unit 11 selects one graph from the normal data DN stored in the storage unit 14 that is suitable for comparison with the target data DT, and obtains the normal rate of change An from its slope.

[0182] Subsequently, the processing unit 11 uses the value of the judgment criterion value J stored in the storage unit 14 of the terminal 10 to calculate whether the following judgment expression is true or not, similar to the first embodiment.

[0183] [Judgment formula]

[0184]

number

[0185] If this determination is true, the output unit 13 of terminal 10 outputs a message indicating that the target scroll compression element 111e is "normal" as a diagnostic result. With this, the diagnostic system 90 completes its diagnosis.

[0186] On the other hand, if this determination formula is false, the output unit 13 of terminal 10 outputs a message indicating that the target scroll compression element 111e is "abnormal" as a diagnostic result. With this, the diagnostic system 90 terminates its diagnosis.

[0187] (3) Features With this configuration, the diagnostic system 90 includes a terminal 10 that has most of the main functions, while not requiring the server 80 and network 70 used in the first embodiment. Therefore, the cost of the diagnostic system 90 can be reduced. In addition, by transporting the terminal 10 to the installation location of the target refrigeration unit 100, diagnostics can be performed flexibly.

[0188] (4) Variations One or more modifications of the first embodiment may be applied to this embodiment.

[0189] <Third Embodiment> (1) Overall structure Figure 20 shows the configuration of the diagnostic system 90 according to the third embodiment. The configuration of this embodiment differs from that of the first embodiment in that it does not use normal data DN.

[0190] The diagnostic system 90 of this embodiment has the same hardware configuration as the first embodiment. However, unlike the first embodiment, the storage unit 83 does not store normal data DN.

[0191] (2) Diagnostic procedure In the diagnostic system 90 of this embodiment, the processing unit 11 of the terminal 10 determines whether the target scroll compression element 111e is good or bad depending on whether the following determination formula is true or not.

[0192] [Judgment formula]

[0193]

number

[0194] Here, |At| is the magnitude (absolute value) of the target rate of change At. J is the judgment criterion value. However, unlike the first embodiment, the value of the judgment criterion value J is not limited to the range of 0.0 or greater and less than 1.0. If this judgment expression is true, the output unit 13 of the terminal 10 outputs a message indicating that the target scroll compression element 111e is "normal" as a diagnostic result. On the other hand, if this judgment expression is false, the output unit 13 of the terminal 10 outputs a message indicating that the target scroll compression element 111e is "abnormal" as a diagnostic result.

[0195] (3) Features In this embodiment, the target scroll compression element 111e is diagnosed without using normal data DN.

[0196] As described above, the verifier of the technology of this disclosure discovered that as the degree of wear Qt of the target scroll compression element 111e of the target refrigeration device 100 deteriorates, the magnitude of the rate of change At of the target refrigeration device 100 decreases. Therefore, by setting an appropriate constant as the judgment criterion value J, it is possible to diagnose the quality of the target scroll compression element 111e.

[0197] (4) Variations (4-1) First variation In the embodiment described above, the judgment criterion value J is a single constant. Alternatively, a different judgment criterion value J may be set for each of the many segments E that are candidates for the selected segment Eu in Figure 14, which corresponds to the target data DT.

[0198] (4-2) Second variation One or more modifications of the first embodiment may be applied to the embodiments described above.

[0199] (4-3) Third variation The hardware configuration of the diagnostic system 90 in the above-described embodiment may be the same as that of the second embodiment or its modified form.

[0200] <Conclusion> While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of Symbols]

[0201] 10: Terminal 11: Processing Section 12: Input section 13: Output section 14: Storage section 15: Acquisition part 70: Network 80: Server 81: Processing Unit 82: Database 83: Storage section 84: Acquisition section 90: Diagnostic System 100: Target refrigeration equipment 111: Target compressor 111e: Target scroll compression element 111m: Target compressor motor 200: Normal refrigeration device 211: Normal compressor 211e: Normal scroll compression element 211m: Normal compressor motor 300: Refrigeration equipment in operation An: Normal change rate An1: Normal first rate of change An2: Normal second rate of change At: Target change rate At1: Target first rate of change At2: Target second rate of change DN: Normal data DT: Target data E: Segment Eu: Selected segment Ev: Selected segment F: Refrigerant I: Performance index value In: Normal operation index value It: Target performance index value J: Judgment criteria value Pi: Inhalation pressure Po: Discharge pressure Q: Degree of wear Qn: Normal wear level Qt: Degree of wear on the target object R: Rotation speed Rn: Normal rotation speed Rt: Target rotational speed S: State variable Sn: Normal state quantity St: Target state variable S1: First state variable S1n: Normal first state variable S1t: Target first state variable S2: Second state quantity S2n: Normal second state variable S2t: Target second state variable Tc: Condensation temperature Te: Evaporation temperature X1~X9: Rank Y1~Y8: Rank [Prior art documents] [Patent Documents]

[0202] [Patent Document 1] Patent No. 7307357

Claims

1. A target scroll compression element (111e) for compressing the refrigerant (R), and A target compressor motor (111m) that drives the target scroll compression element (111e), A diagnostic system (90) for diagnosing the target scroll compression element (111e) of a target refrigeration system (100) equipped with a target compressor (111) having the following: An acquisition unit (84, 15) acquires target data (DT) that can derive a target change rate (At), which is the rate of change of a target operation index value (It) related to the operation of the target compressor motor (111m) with respect to a target state quantity (St), which is the state quantity of the refrigerant in the target refrigeration device (100), A memory unit (83, 14) capable of holding a judgment criterion value (J), A processing unit (11) derives the target change rate (At) from the target data (DT), and derives a diagnostic result for the target scroll compression element (111e) based on the target change rate (At) and the judgment criterion value (J), An output unit (13) that outputs the diagnostic result derived by the processing unit, A diagnostic system (90) equipped with the above.

2. The processing unit derives the diagnostic result according to the comparison result between the magnitude (|At|) of the target rate of change (At) and the judgment criterion value (J). The diagnostic system according to claim 1.

3. The aforementioned target data (DT) is, The aforementioned target operating index value (It), The aforementioned target state quantity (St), and The target rotational speed (Rt) is the number of rotations per unit time of the target compressor motor (111m), It contains multiple sets of values, The multiple target rotational speed (Rt) values ​​included in the target data (DT) are concentrated within a predetermined range (X1 to X9). The diagnostic system according to claim 1.

4. The aforementioned target data (DT) is: The aforementioned target rate of change (At), and The target rotational speed (Rt) is the number of rotations per unit time of the target compressor motor (111m), It contains multiple sets of values, The multiple target rotational speed (Rt) values ​​included in the target data (DT) are concentrated within a predetermined range (X1 to X9). The diagnostic system according to claim 1.

5. The aforementioned target operating index value (It) is a frequency component in the current of the target compressor motor (111m) that corresponds to one or an integer multiple of the target rotational speed (Rt). The diagnostic system according to claim 3.

6. The aforementioned target state quantity (St) is at least one of the following: the pressure (Pi) of the refrigerant drawn in by the target compressor (111), the pressure (Po) of the refrigerant discharged by the target compressor (111), the evaporation temperature (Te) of the refrigerant in the target refrigeration system (100), and the condensation temperature (Tc) of the refrigerant in the target refrigeration system (100). The diagnostic system according to claim 1.

7. The aforementioned target state variable (St) includes the target first state variable (S1t) and the target second state variable (S2t), The aforementioned target rate of change (At) includes the target first rate of change (At1) and the target second rate of change (At2). The aforementioned target first rate of change (At1) is the rate of change of the target operation index value (It) with respect to the target first state variable (S1t), The aforementioned second rate of change of the target (At2) is the rate of change of the target operating index value (It) with respect to the aforementioned second state variable (S2t). The processing unit derives the diagnostic result based on the target first rate of change (At1), the target second rate of change (At2), and the judgment criterion value (J). The diagnostic system according to claim 1.

8. The storage units (83, 14) are also capable of storing normal data (DN), The aforementioned normal data (DN) is such that the rate of change to normal (An) can be calculated. The aforementioned rate of normal change (An) is, A normal scroll compression element (211e) that compresses the refrigerant and functions normally, and A normal compressor motor (211m) drives the normal scroll compression element (211e), This is the rate of change of a normal operating index value (In) related to the operation of the normal compressor motor, obtained from a normal refrigeration system (200) equipped with a normal compressor (211), with respect to the normal state quantity (Sn), which is the state quantity of the refrigerant in the normal refrigeration system. The processing unit derives the diagnostic result based on the target rate of change (At), the normal rate of change (An), and the judgment criterion value (J). The diagnostic system according to claim 1.

9. The processing unit derives the diagnostic result based on the comparison result between the ratio (|At| / |An|) of the magnitude of the target rate of change (At) (|At|) to the magnitude of the normal rate of change (An) (|An|) and the judgment criterion value (J). The diagnostic system according to claim 8.

10. The aforementioned target data (DT) is: The aforementioned target operating index value (It), The aforementioned target state quantity (St), and The target rotational speed (Rt) is the number of rotations per unit time of the target compressor motor (111m), It contains multiple sets of values, The aforementioned normal data (DN) is, The aforementioned normal operating index value (In), The aforementioned normal state quantity (Sn), and The normal rotational speed (Rn) of the normal compressor motor (211m) is the number of rotations per unit time. It contains multiple sets of values, The multiple target rotational speed (Rt) values ​​included in the target data (DT), and the multiple normal rotational speed (Rn) values ​​included in the normal data (DN), are concentrated within a predetermined common range (X1 to X9). The diagnostic system according to claim 8.

11. The aforementioned target data (DT) is: The aforementioned target rate of change (At), and The target rotational speed (Rt) is the number of rotations per unit time of the target compressor motor (111m), It contains multiple sets of values, The aforementioned normal data (DN) is, The aforementioned normal rate of change (An), and The normal rotational speed (Rn) of the normal compressor motor (211m) is the number of rotations per unit time. It contains multiple sets of values, The multiple target rotational speed (Rt) values ​​included in the target data (DT), and the multiple normal rotational speed (Rn) values ​​included in the normal data (DN), are concentrated within a predetermined common range (X1 to X9). The diagnostic system according to claim 8.

12. The aforementioned target operating index value (It) is a frequency component in the current of the target compressor motor (111m) that corresponds to one or an integer multiple of the target rotational speed (Rt). The normal operation index value (In) is a frequency component in the current of the normal compressor motor (211m) that corresponds to one or an integer multiple of the normal rotational speed (Rn). The diagnostic system according to claim 10.

13. The target state quantity (St) is at least one of the following: the pressure (Pi) of the refrigerant drawn in by the target compressor (111), the pressure (Po) of the refrigerant discharged by the target compressor (111), the evaporation temperature (Te) of the refrigerant in the target refrigeration system (100), and the condensation temperature (Tc) of the refrigerant in the target refrigeration system (100). The normal state quantity (Sn) is at least one of the following: the pressure of the refrigerant drawn in by the normal compressor (211) (Pi), the pressure of the refrigerant discharged by the normal compressor (211) (Po), the evaporation temperature of the refrigerant in the normal refrigeration system (200) (Te), and the condensation temperature of the refrigerant in the normal refrigeration system (200) (Tc). The diagnostic system according to claim 8.

14. The aforementioned target state variable (St) includes the target first state variable (S1t) and the target second state variable (S2t), The aforementioned target rate of change (At) includes the target first rate of change (At1) and the target second rate of change (At2). The aforementioned target first rate of change (At1) is the rate of change of the target operation index value (It) with respect to the target first state variable (S1t), The aforementioned second rate of change of the target (At2) is the rate of change of the target operating index value (It) with respect to the aforementioned second state variable (S2t). The aforementioned normal state quantity (Sn) includes a normal first state quantity (S1n) and a normal second state quantity (S2n), The aforementioned normal rate of change (An) includes the normal first rate of change (An1) and the normal second rate of change (An2). The normal first rate of change (An1) is the rate of change of the normal operating index value (In) with respect to the normal first state variable (S1n). The aforementioned normal second rate of change (An2) is the rate of change of the normal operating index value (In) with respect to the normal second state variable (S2n). The processing unit derives the diagnostic result based on the target first rate of change (At1), the target second rate of change (At2), the normal first rate of change (An1), the normal second rate of change (An2), and the judgment criterion value (J). The diagnostic system according to claim 8.

15. Terminal (10) and A server (80) that can communicate with the aforementioned terminal via a network (70), Furthermore, The terminal (10) has the processing unit (11) and the output unit (13), The server (80) has the acquisition unit (84) and the storage unit (83), A diagnostic system according to any one of claims 1 to 14.

16. Terminal (10), Furthermore, The terminal comprises the acquisition unit (15), the storage unit (14), the processing unit (11), and the output unit (13). A diagnostic system according to any one of claims 1 to 14.

17. A target scroll compression element (111e) for compressing the refrigerant (R), and A target compressor motor (111m) that drives the target scroll compression element (111e), A method for diagnosing the target scroll compression element (111e) of a target refrigeration system (100) equipped with a target compressor (111) having the following characteristics: The computer (10, 80) acquires target data (DT) from which a target change rate (At), which is the rate of change of a target operating index value (It) related to the operation of the target compressor motor (111m) with respect to a target state quantity (St), which is the state quantity of the refrigerant in the target refrigeration device (100), can be derived. The computer (10, 80) holds the judgment criterion value (J), The computer (10, 80) derives the target change rate (At) from the target data (DT), and derives a diagnostic result for the target scroll compression element (111e) based on the target change rate (At) and the judgment criterion value (J). The computer (10, 80) outputs the diagnostic results. method.

18. A target scroll compression element (111e) for compressing the refrigerant (R), and A target compressor motor (111m) that drives the target scroll compression element (111e), A program for diagnosing the target scroll compression element (111e) of a target refrigeration system (100) equipped with a target compressor (111) having the following: The computers (10, 80) are configured to function as acquisition units (84, 15) that acquire target data (DT) that can derive a target change rate (At), which is the rate of change of a target operation index value (It) related to the operation of the target compressor motor (111m) with respect to a target state quantity (St), which is the state quantity of the refrigerant in the target refrigeration device (100). The aforementioned computers (10, 80) are configured to function as memory units (83, 14) capable of holding judgment criteria values ​​(J). The computer (10, 80) is configured to function as a processing unit (11) that derives the target change rate (At) from the target data (DT), and derives a diagnostic result for the target scroll compression element (111e) based on the target change rate (At) and the judgment criterion value (J). The computer (10, 80) is made to function as an output unit (13) that outputs the diagnostic result derived by the processing unit. program.

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