JP2015148394A - Compressor deterioration diagnostic device and compressor deterioration diagnostic method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a compressor deterioration diagnostic device and the like for performing deterioration diagnosis of a compressor while performing operation for maintaining stability of temperature and the like in an object space which a refrigeration cycle device heats or cool and the like.SOLUTION: A compressor deterioration diagnostic device 30 of a refrigeration cycle device for configuring a refrigerant circuit by connecting a compressor 1 and the like by piping includes: a measurement unit 30a for measuring a physical amount detected by various types of detection means; a drive unit 30c for performing operation control by driving the compressor 1; and a determination unit 30e for performing deterioration diagnosis of the compressor by the determination based on the measurement result of the measurement unit 30a. The determination unit 30e determines whether or not to start a deterioration diagnosis operation for measuring a physical amount related to the deterioration diagnosis of the compressor 1, and when it determines to start the deterioration diagnosis operation, it allows the drive unit 30c to perform operation for increasing temperature in an object space by changing the setting temperature high, and when it determines that the temperature has reached the setting temperature, it performs processing of allowing the drive unit 30c to perform the deterioration diagnosis operation before the temperature in the object space drops to predetermined temperature.

Description

  The present invention relates to a compressor deterioration diagnosis device for diagnosing deterioration of a compressor. In particular, the present invention relates to compressor diagnosis in a refrigeration cycle apparatus.

  In a refrigeration cycle apparatus that drives a compressor and circulates refrigerant to perform heating, cooling, and the like, the compressor itself deteriorates when an operation period elapses after the apparatus is installed. Specifically, due to wear of the compression mechanism, refrigerant leakage or the like from the high pressure side portion to the low pressure side portion occurs in the compressor. For this reason, compression efficiency falls and COP (coefficient of performance) of a refrigerating cycle device falls. Conventionally, there is no method for directly knowing the deterioration of the compressor, and there is a case where the compressor or parts are not replaced until a situation where it is clearly regarded as abnormal occurs or the compressor completely fails. There were many. Therefore, a technique for diagnosing (determining or judging) deterioration of the compressor has been proposed.

  As a method of diagnosing compressor deterioration, a polytropic index that does not change as long as the refrigerant state before and after the compression process is constant is measured periodically, and the value of this index exceeds the specified range. There is a method of diagnosing that the compressor has deteriorated (see, for example, Patent Document 1). Here, if a change in environmental conditions such as ambient air temperature continues until the same refrigerant state is established, it takes a long time until the refrigerant condition for determining the compressor deterioration is satisfied.

  In addition, it communicates with multiple air conditioners via a network (electrical communication line) such as a LAN or telephone line, and receives signals including operation data sent from the air conditioner, data such as the history of failure of components, etc. In addition, there is a remote monitoring system for an air conditioner that includes a monitoring device that performs recording or the like (see, for example, Patent Document 2). In this remote monitoring system, the bearing damage of the compressor is determined based on the current flowing through the compressor.

JP 2002-147905 A JP 2001-141290 A

  Usually, for example, air conditioning equipment is selected with a margin for building loads. As for the compressor, even when the load is high in summer, the compressor can be supplied with a rotational speed of about 70% of the maximum rotational speed. Therefore, there is a case where the compressor is fixedly driven at a high frequency under conditions common to the failure diagnosis including the compressor deterioration diagnosis.

  For example, in the compressor deterioration diagnosis method as in Patent Document 1, there is a tendency that the operation time becomes long in order to maintain the refrigerant state necessary for obtaining physical quantities (temperature, pressure) necessary for diagnosis. For this reason, if the compressor is driven at a high frequency and driven, the room temperature becomes too low, and for example, a resident in the room (indoor) feels uncomfortable, which may cause problems in air conditioning. There is sex.

  In addition, the remote monitoring system of Patent Document 2 collects data related to the operation of the air conditioner. However, when collecting the data, the operation of the air conditioner is actively controlled from the monitoring device side. There wasn't.

  The present invention has been made to solve the above-described problems, and while performing an operation of maintaining the temperature of the target space or the like to be heated or cooled by the refrigeration cycle apparatus within a range that does not hinder the compressor, It aims at obtaining the compressor deterioration diagnostic apparatus etc. which perform a deterioration diagnosis.

  The present invention is a compressor deterioration diagnosis device for solving the above-described problems. A refrigerant circuit is configured by connecting a compressor, a condenser, a decompression device, and an evaporator, and the target space is set to a set temperature. A compressor deterioration diagnosis device for diagnosing compressor deterioration of a refrigeration cycle apparatus, a measurement unit for measuring a physical quantity detected by a detection means, a drive unit for driving control at least by driving a compressor, and measurement A determination unit that performs a deterioration diagnosis of the compressor based on a determination based on a measurement result of the unit, the determination unit determines whether or not to start a deterioration diagnosis operation for measuring a physical quantity related to the deterioration diagnosis of the compressor, and the deterioration diagnosis When it is determined that the operation is to be started, the drive unit is operated to increase the temperature of the target space by changing the set temperature to be high, and when it is determined that the set temperature has been reached, the temperature of the target space is decreased to a predetermined temperature. Between It performs processing to perform the deterioration diagnosis operation to the driving unit.

  In the compressor deterioration diagnosis device according to the present invention, the deterioration diagnosis operation is performed after the set temperature is raised and before the deterioration diagnosis operation is lowered to the predetermined temperature before performing the deterioration diagnosis operation with excessive capacity. For example, the deterioration diagnosis of the compressor can be performed while maintaining the environment (temperature, etc.) of the target space within a range where there is no problem.

It is a figure which shows the structure of the air conditioning apparatus 100 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the control relationship of the air conditioning apparatus 100 which concerns on Embodiment 1 of this invention. It is a Ph diagram which shows the state transition of the refrigerant | coolant of the air conditioning apparatus 100 which concerns on Embodiment 1 of this invention. It is a figure which shows the flow of the compressor deterioration diagnosis of the air conditioning apparatus 100 which concerns on Embodiment 1 of this invention. It is a figure explaining control of refrigerant state control operation 1 concerning Embodiment 1 of this invention. It is a figure which shows an example of the diagnostic reference value function table | surface which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the air conditioning apparatus monitoring system 1000 which concerns on Embodiment 2 of this invention.

  Hereinafter, a refrigeration cycle apparatus and the like according to embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals denote the same or corresponding parts, and are common to all the embodiments described below. And the form of the component represented by the whole specification is an illustration to the last, Comprising: It does not limit to the form described in the specification. In particular, the combination of the components is not limited to the combination in each embodiment, and the components described in the other embodiments can be applied to another embodiment. In addition, when there is no need to particularly distinguish or identify a plurality of similar devices that are distinguished by subscripts, the subscripts may be omitted. In the drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
"Equipment configuration"
1 is a diagram showing a configuration of an air-conditioning apparatus 100 according to Embodiment 1 of the present invention. An air conditioner 100 serving as a refrigeration cycle apparatus has an outdoor unit A and a plurality of indoor units B (B1 and B2 in FIG. 1), which are connected by refrigerant piping. In this embodiment, two indoor units B1 and B2 are connected by piping in parallel. However, one or three or more indoor units B may be connected. Moreover, even if each heat exchange capacity | capacitance of the some indoor unit B differs, the heat exchange capacity | capacitance of all the indoor units B may be the same.

  The outdoor unit A includes a compressor 1, a four-way valve 2, and an outdoor heat exchanger 3, for example. The indoor unit B includes an indoor heat exchanger 5 and an expansion valve 4. The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion valve 4 and the indoor heat exchanger 5 are connected by piping to constitute a refrigerant circuit for circulating the refrigerant.

Here, any kind of refrigerant can be used for the type of refrigerant circulating in the refrigerant circuit. For example, a natural refrigerant such as carbon dioxide (CO ₂ ), hydrocarbon, helium, or R410A can be used. In addition, a refrigerant that does not contain chlorine, such as an alternative refrigerant such as R407C and R404A, can be used.

  The compressor 1 compresses and discharges the sucked refrigerant. The compressor 1 according to the present embodiment is a positive displacement compressor capable of changing an operation capacity (frequency) by, for example, an inverter circuit.

  The four-way valve 2 is a valve having a function of switching the direction in which the refrigerant flows depending on, for example, a cooling operation and a heating operation. During the cooling operation, the refrigerant flow path is switched so that the discharge side of the compressor 1 and the outdoor heat exchanger 3 are connected and the connection pipe between the suction side of the compressor 1 and the indoor unit is connected (four directions in FIG. 1). Solid line of valve 2). During the heating operation, the refrigerant piping is switched to connect the discharge side of the compressor 1 to the indoor unit and connect the suction side of the compressor 1 to the outdoor heat exchanger 3 (four directions in FIG. 1). The broken line of valve 2). Here, although this embodiment demonstrates the air conditioning apparatus which can provide the four-way valve 2 and can switch heating operation and cooling operation, it is not restricted to such an air conditioning apparatus. For example, the present invention can be applied to an air conditioner that performs only a cooling operation. When performing only the cooling operation, it is not necessary to provide the four-way valve 2.

  The outdoor heat exchanger 3 performs heat exchange between the outside air (outdoor air) sent by the outdoor blower 6 and the refrigerant. For example, it functions as an evaporator during heating operation, evaporating and evaporating the refrigerant. Moreover, it functions as a condenser during the cooling operation, and condenses and liquefies the refrigerant. The outdoor air blower 6 sends outside air into the outdoor heat exchanger 3 and promotes heat exchange with the refrigerant. Here, the outdoor air blower 6 is composed of a centrifugal fan, a multiblade fan or the like driven by a DC motor (not shown), and can adjust the air flow rate.

  In addition, the valve 11 (11a, 11b) is configured by a valve capable of opening and closing, such as a ball valve, an on-off valve, and an operation valve, provided in a pipe connection port with the outside in the outdoor unit A. For example, the passage of the refrigerant to the outside is limited by closing.

  The expansion valve 4 such as a decompression device (a throttling device, a flow rate control device) included in the indoor unit B decompresses and expands the refrigerant. In this embodiment, an electronic expansion valve or the like whose opening degree can be arbitrarily adjusted is used. Moreover, the indoor heat exchanger 5 performs heat exchange between the air in the air-conditioning target (indoor) and the refrigerant sent by the indoor blower 7, for example. During heating operation, it functions as a condenser and condenses and liquefies the refrigerant. Moreover, it functions as an evaporator during cooling operation, evaporating and evaporating the refrigerant. The indoor air blower 7 sends indoor air into the indoor heat exchanger 5 to promote heat exchange with the refrigerant. It is assumed that the air blowing amount can also be adjusted for the indoor air blowing device 7.

  Next, sensors and the like serving as detection means for detecting various physical quantities in order to determine the operating state of the air conditioner will be described. The outdoor unit A of the present embodiment includes a discharge temperature sensor 41, a suction temperature sensor 42, an outdoor intake air temperature sensor 40, a discharge pressure sensor 31, and a suction pressure sensor 32. Further, an outdoor intake air temperature sensor 40 is provided as an outside air temperature detecting means for detecting the outside air temperature.

  The discharge temperature sensor 41 is installed on the discharge side of the compressor 1 and detects the temperature of the refrigerant discharged from the compressor 1. The suction temperature sensor 42 is installed on the suction side of the compressor 1 and detects the temperature of the refrigerant sucked into the compressor 1.

  The discharge pressure sensor 31 is installed on the discharge side of the compressor 1 and detects the pressure of the refrigerant discharged from the compressor 1. The suction pressure sensor 32 is installed on the suction side of the compressor 1 and detects the pressure of the refrigerant sucked into the compressor 1. By converting the pressure detected by the discharge pressure sensor 31 into a saturation temperature, the condensation temperature CT in the refrigerant circuit can be obtained. Further, the evaporation temperature ET in the refrigerant circuit can be obtained by converting the pressure detected by the suction pressure sensor 32 into the saturation temperature.

  Here, the installation positions of the discharge pressure sensor 31 and the discharge temperature sensor 41 are not limited to the positions shown in FIG. 1, and may be any section from the discharge side of the compressor 1 to the four-way valve 2. Further, the installation positions of the suction pressure sensor 32 and the suction temperature sensor 42 are not limited to the positions shown in FIG. 1, and may be any section from the four-way valve 2 to the suction side of the compressor 1.

  The outdoor intake air temperature sensor 40 detects the air temperature flowing into the outdoor heat exchanger 3 as the ambient air temperature of the outdoor unit A in which the outdoor heat exchanger 3 is installed.

  Each indoor unit B of the present embodiment is provided with a gas side temperature sensor 44 and a liquid side temperature sensor 45 at the refrigerant outlet of the indoor heat exchanger 5 as an operating state quantity detection means. Moreover, the indoor intake air temperature sensor 43 is provided as a room temperature detection means which detects the indoor temperature used as air-conditioning object space.

  The gas side temperature sensor 44 detects the temperature of the refrigerant that flows out of the indoor heat exchanger 5 during the cooling operation (flows into the indoor heat exchanger 5 during the heating operation). The liquid side temperature sensor 45 detects the temperature of the refrigerant flowing out of the indoor heat exchanger 5 during heating operation (flowing into the indoor heat exchanger 5 during cooling operation).

  The indoor intake air temperature sensor 43 detects, for example, the temperature of the air flowing into the indoor heat exchanger 5 as the ambient air temperature of the indoor unit B.

  FIG. 2 is a block diagram showing the control relationship of the air-conditioning apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 shows a relationship between the control unit 30 serving as a control device that controls the air conditioning apparatus 100, and the sensors and actuators that are connected to the control unit 30 in connection with signal transmission / reception. In addition, the control unit 30 of the present embodiment is a compressor deterioration diagnosis device that diagnoses deterioration of the compressor 1.

  The control part 30 of this Embodiment is incorporated in the outdoor unit A, for example. The control unit 30 includes a measurement unit 30a, a calculation unit 30b, a drive unit 30c, a storage unit 30d, and a determination unit 30e.

  The measurement unit 30a receives a signal including an operation state quantity that is a physical quantity detected by various sensors (such as a pressure sensor and a temperature sensor). And the measurement part 30a performs measurement processing, such as a pressure and temperature. The measuring unit 30a also measures the operating capacity of the compressor 1 as the operating state quantity. Here, it is good also considering the rotation speed (drive frequency) which a drive part instruct | indicates to the compressor 1 as an operating capacity. The data of the operation state quantity measured by the measurement unit 30a as described above is stored in the storage unit 30d and processed by the calculation unit 30b.

  For example, based on the operating state quantity measured by the measurement unit 30a, the calculation unit 30b calculates, for example, a refrigerant physical property value (saturation pressure, saturation temperature, enthalpy, etc.) and the like using a given formula or the like. Here, for example, the measurement unit 30a may measure the refrigerant condensation temperature CT, the refrigerant evaporation temperature ET, the suction refrigerant superheat degree SHs of the compressor 1, and the like. In addition, based on the operating state quantity and the like, the determination unit 30e performs a calculation process of a diagnostic index δ and the like for performing a deterioration diagnosis of the compressor 1.

  The drive unit 30c drives devices of the air conditioner 100 such as the compressor 1, the expansion valve 4, the outdoor blower 6, and the indoor blower 7, based on the determination of the determination unit 30e based on the calculation result of the calculation unit 30b, for example. And perform various operation controls.

  The storage unit 30d is an operational state quantity related to the measurement process of the measurement unit 30a, a result obtained by the calculation unit 30b, a function constant or function for calculating a predetermined constant, a physical property value (saturation pressure, saturation temperature) of the refrigerant. A table or the like is stored as data. The data in the storage unit 30d can be referred to and rewritten as necessary. The storage unit 30d stores a control program, and each unit of the control unit 30 performs processing such as operation control of the air-conditioning apparatus 100 and compressor deterioration diagnosis according to the program stored in the storage unit 30d.

  Based on the measurement result of the measurement unit 30a, the calculation result of the calculation unit 30b, and the like, the determination unit 30e performs processing such as setting of a deterioration diagnosis reference value δm, comparison with a diagnosis index δ, and deterioration diagnosis (determination) described later. . Details of the compressor deterioration diagnosis method will be described later.

  Here, regarding the hardware configuration of the control unit 30, the measurement unit 30a, the calculation unit 30b, the drive unit 30c, and the determination unit 30e are configured by, for example, a microcomputer having a CPU or the like. The storage unit 30d is configured by a semiconductor memory or the like. When the CPU executes the program stored in the memory, the processing performed by the measurement unit 30a, the calculation unit 30b, the drive unit 30c, and the determination unit 30e is realized.

  The control unit 30 is connected to the output device 50 and the input device 60. The output device 50 is an LED for displaying or notifying the result processed by the control unit 30, a display / notification unit such as a monitor, a communication unit that is included in a signal and transmitted to an electric communication line or the like. The input device 60 is a remote controller to which an operation instruction or the like is input, an input unit such as a switch on a board, a communication unit (not shown) to which an external signal is input through an electric communication line.

  Here, in the air conditioning apparatus 100 of this Embodiment, it was set as the structure which incorporates the control part 30 in the outdoor unit A, However, It is not restricted to this. For example, the control unit 30 may be configured by a plurality of hardware and functions may be distributed. For example, the outdoor unit A may have a main control unit, and the indoor unit B may have a sub-control unit that executes a part of the function of the control unit. And it is good also as a structure which performs a cooperation process by performing data communication between the main control part and a sub control part. Further, the indoor unit B may include a control unit. Moreover, you may make it place a control part separately in the apparatus outside an air conditioning apparatus.

《Driving operation (cooling mode)》
A typical operation mode in the air-conditioning apparatus 100 according to Embodiment 1 and an operation operation in a cooling mode in which the refrigerant flows in the same manner as the compressor deterioration diagnosis mode described later will be described with reference to FIG. In the cooling mode, the four-way valve 2 is in the state indicated by the solid line in FIG. Therefore, the discharge side of the compressor 1 and the piping on the outdoor heat exchanger 3 side are connected, and the suction side of the compressor 1 and the indoor heat exchanger 5 are connected.

  The compressor 1 discharges a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 serving as a condenser via the four-way valve 2. In the outdoor heat exchanger 3, the refrigerant is condensed and liquefied by heat exchange with the outside air sent by the ventilation of the outdoor blower 6, and flows out of the outdoor unit A as a high-pressure and low-temperature refrigerant.

  The refrigerant flowing out of the outdoor unit A flows into each indoor unit B. The refrigerant flowing into each indoor unit B is decompressed by each expansion valve 4 to become a two-phase refrigerant, and is sent to each indoor heat exchanger 5. The decompressed two-phase refrigerant flows into each indoor heat exchanger 5 serving as an evaporator. In each indoor heat exchanger 5, it evaporates by heat exchange with the indoor air sent by the indoor blower 7, and flows out from each indoor unit B as a low-pressure gas refrigerant. The low-pressure gas refrigerant flowing out from each indoor unit B flows into the outdoor unit A and is sucked into the compressor 1 via the four-way valve 2.

  Here, the control part 30 adjusts the opening degree of the expansion valve 4 so that the refrigerant superheat degree in the low-pressure gas refrigerant flowing out from each indoor heat exchanger 5 becomes a predetermined temperature. The refrigerant superheat degree in the low-pressure gas refrigerant is a temperature obtained by subtracting a saturation temperature conversion value (evaporation temperature ET) based on the pressure detected by the suction pressure sensor 32 from the temperature detected by each gas side temperature sensor 44. Thus, each indoor heat exchanger 5 is supplied with a refrigerant having a flow rate corresponding to the operation load required in the air-conditioned space in which the indoor unit B is installed.

《Compressor deterioration diagnosis method》
FIG. 3 is a Ph diagram showing refrigerant state transition in the air-conditioning apparatus 100 according to Embodiment 1 of the present invention. In the air conditioner 100 of the first embodiment, the compressor deterioration diagnosis method performed by the control unit 30 is based on a reference operating state amount (diagnosis standard) under a predetermined refrigerant condition at the time of installation of the air conditioner 100 and a predetermined value from the installation. The deterioration of the compressor 1 is diagnosed by comparing the operating state quantity (diagnosis index) under the same predetermined refrigerant condition as the reference when the period has elapsed. The principle of the compressor deterioration diagnosis will be described.

  In the vapor compression refrigeration cycle that is the operation principle of the air-conditioning apparatus 100 according to Embodiment 1, the refrigerant starts from point A in the compression stroke as shown in the Ph diagram (Mollier diagram) shown in FIG. After being compressed to point B, it is cooled to point C in the condensation stroke. Then, the refrigerant cooled to point C is subjected to an action of being depressurized to point D in the expansion stroke and heated to point A in the evaporation stroke. The refrigerant circuit is circulated as described above.

  On the other hand, when the compressor 1 deteriorates after a long time (for example, several years) has elapsed from the installation, even if the suction side refrigerant state (point A) of the compressor 1 is the same, the curve of the compression stroke changes and the discharge side refrigerant For example, point B moves to point B ′. In this case, the enthalpy difference in the compressor 1 corresponding to the compressor input was Δhc at the beginning of installation, but increased to Δhc ′ and the compressor efficiency is lowered.

  In such a refrigeration cycle, the presence or absence of compressor deterioration can be diagnosed based on the change in the operating state amount accompanying the change in the compression stroke curve when the compressor efficiency is reduced as described above. For example, in the compression stroke, as the efficiency of the compressor 1 decreases, a phenomenon that the refrigerant temperature discharged from the compressor 1 increases approximately monotonically among the operation state quantities is observed. Therefore, in the present embodiment, the compressor deterioration diagnosis is performed based on such a change characteristic of the operation state quantity with respect to the compressor efficiency.

《Compressor deterioration diagnosis mode》
FIG. 4 is a diagram showing a flow of compressor deterioration diagnosis of the air-conditioning apparatus 100 according to Embodiment 1 of the present invention. Hereinafter, the flow of processing in the compressor deterioration diagnosis performed by the control unit 30 will be described. Detailed operation description in each step will be described later. Here, in the compressor deterioration diagnosis mode when the compressor deterioration diagnosis is performed, the four-way valve 2 is switched to the solid line side in FIG. 1, and processing is performed so that the refrigerant flows in the same flow as in the cooling operation in the refrigerant circuit.

  After a certain period of time has elapsed since the start of the compressor deterioration diagnosis process, the actuators of the air conditioner 100 (here, the compressor 1, the expansion valve 4, the outdoor blower 6, and the indoor blower 7 are used to measure the operating state. And the operation state quantity (for example, the refrigerant condensation temperature CT, the refrigerant evaporation temperature ET, the intake refrigerant superheat degree SHs of the compressor 1, the discharge refrigerant temperature Td of the compressor 1, the intake refrigerant temperature Ts of the compressor 1) Measurement processing is performed (step S1).

  Then, based on the measurement result, conditions (diagnosis) such as an appropriate operating state (for example, no start / stop operation of the compressor 1 and the intake refrigerant superheat degree SHs is sufficiently high) for performing the deterioration diagnosis of the compressor 1 are performed. It is determined whether or not (condition) is satisfied (step S2). If it is determined that the diagnosis condition is not satisfied (step S2; NO), the process returns to step S1. If it is determined that the diagnosis condition is satisfied (step S2; YES), the process proceeds to step S3.

  Next, it is determined whether or not there is a resident in the room (indoor) (step S3). As a method for determining whether there is a visitor, for example, the security equipment installed in the building monitors the locked state of each floor, so if the floor is locked, no one is on that floor. A method of judging that there is not is conceivable. In addition, if it is determined that all lighting on the floor is off, a method of determining that there is no one on the floor can be considered. It is conceivable to make a judgment using a human sensor, a temperature sensor, a camera, or the like (not shown) attached to the indoor unit. If the control part 30 judges that there is no visitor (step S3; NO), it will move to step S15. On the other hand, if it is determined that there is a visitor (step S3; YES), the process proceeds to step S4.

  FIG. 5 is a diagram illustrating the control of the refrigerant state control operation according to Embodiment 1 of the present invention. When it is determined in step S3 that there is a resident in the room, the control unit 30 starts the refrigerant state control operation (step S4). The refrigerant state control operation is an operation in which the normal temperature operation is performed after the set temperature is temporarily increased to increase the indoor temperature. For example, in the present embodiment, as shown in FIG. 5, when the set temperature of the living room is 27 ° C., the set temperature is temporarily raised to 28 ° C.

  Then, based on the detection by the indoor intake air temperature sensor 43, it is determined whether or not the room temperature has become 28 ° C. or higher (step S5). If it is determined that the room temperature is not higher than 28 ° C. (the room temperature is lower than 28 ° C.) (step S5; NO), the process returns to step S4 to continue the refrigerant state control operation. If it is determined that the room temperature is 28 ° C. or higher (step S5; YES), the process proceeds to step S6.

  If it is determined that the room temperature is 28 ° C. or higher, a deterioration diagnosis operation is performed (step S6). In the deterioration diagnosis operation (step S6), for example, all the indoor units B are operated as shown in FIG. 5 in order to maintain the compressor speed at a high level. Note that it is not always necessary to operate all the indoor units B, and any number of operating units that can maintain the compressor rotational speed at a high level may be used. Further, the air conditioner 100 is operated by changing the set temperature to 19 ° C. and driving the compressor 1 so as to maintain a high rotational speed (drive frequency). Here, when performing the deterioration diagnosis operation, the control unit 30 controls the airflow direction vanes of the indoor unit B, the indoor blower 7 so that the air blown out from the indoor unit B does not directly hit the resident in the room. You may be made to perform control etc. which suppress rotation speed together.

  Next, based on the detection of the indoor intake air temperature sensor 43, it is determined whether or not the room temperature is 25 ° C. or less (step S7). If it is determined that the room temperature is not lower than 25 ° C. (higher than 25 ° C.) (step S7; NO), the process proceeds to step S8. If it is determined that the room temperature is 25 ° C. or lower (step S7; YES), the deterioration diagnosis operation is terminated as it impedes the operation of air conditioning or the like, for example, the room temperature is too low and the visitor feels uncomfortable. (Step S14), and the process ends.

  If it is determined in step S7 that the room temperature is not 25 ° C. or less, the measurement unit 30a of the control unit 30 performs measurement processing on the operation state amount of the refrigerant circuit and the like based on signals sent from various sensors (step S8). Here, in the present embodiment, as the operation state quantity, for example, the refrigerant condensation temperature CT, the refrigerant evaporation temperature ET, the suction refrigerant superheat degree SHs of the compressor 1, the discharge refrigerant temperature Td of the compressor 1, the compressor 1 is measured. The discharge refrigerant temperature Td is a temperature detected by the discharge temperature sensor 41. The suction refrigerant temperature Ts is a temperature detected by the suction temperature sensor 42. Further, the refrigerant condensing temperature CT is a temperature converted to the saturation temperature of the discharge pressure Pd detected by the discharge pressure sensor 31. The refrigerant evaporation temperature ET is the temperature converted to the saturation temperature of the suction pressure Ps detected by the suction pressure sensor 32. The intake refrigerant superheat degree SHs is a temperature obtained by subtracting the evaporation temperature ET from the intake refrigerant temperature Ts. Moreover, as an object to be measured as the operation state quantity, not only the instantaneous temperature in the trend data but also an average value for every predetermined time (for example, 10 minutes) is derived by calculation or the like. Each obtained temperature is stored in the storage unit 30d as data.

  The determination unit 30e determines whether or not the operation state of the refrigerant circuit (the air conditioner 100) is in a steady state based on the operation state amount data measured by the measurement unit 30a and stored in the storage unit 30d (step S9). ). Conditions for determining the steady state (steady state diagnostic conditions) include the temperatures related to the five operation state quantities of the condensation temperature CT, the evaporation temperature ET, the intake refrigerant superheat degree SHs, the discharge refrigerant temperature Td, and the intake refrigerant temperature Ts. The deviation between the average value in the time-lapse data for a predetermined time (for example, 10 minutes) and the instantaneous value of the time-lapse data at the same time is within a predetermined temperature value (for example, ± 0.5 ° C.). If it is within the predetermined temperature value, it is determined as a steady state. If it is determined that the steady-state determination condition is not satisfied (step S9; NO), the process returns to step S7. If it is determined that the steady diagnosis conditions are satisfied (step S9; YES), the process proceeds to step S10.

  On the other hand, if it is determined in step S3 that there is no resident in the room, there is no need to consider the indoor environment of the resident. Therefore, the deterioration diagnosis operation is performed without performing the refrigerant state control operation (step S15), the operation state amount of the refrigerant circuit is measured (step S16), and it is determined that the steady state is reached (step S17). The process proceeds to step S10.

  Next, the calculation unit 30b calculates the current diagnostic index δ using the operation state quantity and the like related to the measurement of the measurement unit 30a (step S10). For example, a temperature obtained by subtracting the suction refrigerant temperature Ts from the discharge refrigerant temperature Td of the compressor 1 is used as the diagnosis index δ. Here, the diagnostic index δ may be calculated using, for example, an average value for a predetermined time (for example, 10 minutes) calculated in a steady state instead of an instantaneous value.

  Then, a deterioration diagnosis reference value δm that is a deterioration diagnosis reference of the compressor 1 is set (step S11). The deterioration diagnosis reference value δm is a value corresponding to the diagnosis index δ in the initial state where the compressor 1 is not deteriorated (the efficiency of the compressor 1 is not reduced). The calculation unit 30b refers to data relating to the function of the deterioration diagnosis reference value δm stored in advance in the storage unit 30d, and sets the deterioration diagnosis reference value δm according to the operating state quantity. In the present embodiment, the function of the deterioration diagnosis reference value δm stored in advance in the storage unit 30d is, for example, the operating capacity of the compressor 1, the refrigerant evaporation temperature ET and the condensation temperature CT in the refrigerant circuit among the operating state quantities. It is assumed that the function is a variable. As described above, the refrigerant condensation temperature CT and the evaporation temperature ET are derived by the measurement unit 30a as the saturation temperature of the discharge pressure and the suction pressure of the compressor 1. Here, for each operation state quantity used for setting the deterioration diagnosis reference value δm, an average value in a predetermined time (for example, 10 minutes) calculated by the measurement unit 30a based on the operation state quantity in the steady state is used.

<< Degradation diagnosis reference value δm setting method >>
FIG. 6 is a diagram showing an example of a diagnostic reference value function table according to Embodiment 1 of the present invention. Here, a procedure for setting the deterioration diagnosis reference value δm of the compressor 1 in the air conditioner 100 will be described. FIG. 6 shows the deterioration diagnosis reference value δm in the form of a function table. In the example shown in FIG. 6, the common conditions are the outside air temperature Ta = 35 ° C. and the refrigerant superheat degree SH = 2 ° C. at the evaporator outlet. As a variable, the compressor frequency is set to 78 Hz, 88 Hz, and 98 Hz. The condensation temperature CT is set to 38 ° C., 42 ° C., and 46 ° C. And about evaporation temperature ET, 0 degreeC, 2 degreeC, and 5 degreeC are made into conditions.

  The numerical values of δ [111] to δ [333] in the diagnostic reference value function table shown in FIG. 6 obtained for all combinations of conditions are stored in the storage unit 30d as model data. Each numerical value as model data is a value obtained by simulation or the like based on the compressor performance characteristics of the target device (compressor 1).

  Using the operating capacity (frequency) of the compressor 1 detected as the operating state quantity, the values of the condensation temperature CT and the evaporation temperature ET, linear interpolation is performed based on the diagnostic reference value function table as shown in FIG. A deterioration diagnosis reference value δm corresponding to the operating state quantity is obtained.

  For example, regarding the operating state quantity, it is assumed that the frequency of the compressor 1 is 78 Hz, the condensation temperature CT is 42.5 ° C., and the evaporation temperature ET is 2.2 ° C. In the function table (δm function table (1)) with a compressor frequency of 78 Hz shown in FIG. 6, δ [122], δ [123], δ [132], δ, which are neighboring numerical values close to the detected operating state quantity. Using the value of [133], a value corresponding to the detected operating state is obtained by linear interpolation. The obtained value is set as the deterioration diagnosis reference value δm in the detected operating state quantity.

  Here, the numerical value of the model data may be corrected based on the actual operation data of the target device. Because the data in the initial operation immediately after installation of the target device is used for correction, the value in the diagnostic reference value function table becomes the diagnostic reference value based on the actual operating state when the compressor is normal (when the compressor is not deteriorated). Therefore, it is possible to set a deterioration diagnosis reference value that matches the actual condition of the target device.

  By obtaining the deterioration diagnosis reference value δm by the procedure as described above, it is possible to set an appropriate deterioration diagnosis reference value δm according to the operating state, and to realize a highly accurate compressor deterioration diagnosis.

  Here, in the diagnostic reference value function table of FIG. 6, specific numerical values are set and described for each condition of the compressor frequency, the condensation temperature CT, the evaporation temperature ET, the refrigerant superheat degree SH at the evaporator outlet, and the outside air temperature Ta. However, these numerical values are examples, and arbitrary numerical values can be set for each condition.

  In addition, here, the diagnosis reference value function is described as being stored and held in the function table format, but is not limited to this format. Any function can be used as long as it can set the deterioration diagnosis reference value δm, such as a function expression format using the operation state quantity as a variable.

  When setting the deterioration diagnosis reference value δm, the determination unit 30e compares the current diagnosis index δ with the diagnosis threshold value δ0 obtained based on the deterioration diagnosis reference value δm, and determines whether or not the compressor 1 has deteriorated. (Step S12). Here, as the current diagnostic index δ used for diagnosis, an average value of a predetermined time (for example, 10 minutes) of the diagnostic index δ calculated in the steady state is used. When determining that δ> δ0, the determination unit 30e diagnoses that the compressor 1 has deteriorated (step S12; YES). The determination unit 30e outputs a signal indicating “compressor deterioration abnormality” to the output device 50 to notify the display device that deterioration has occurred (step S13), and ends the deterioration diagnosis operation (step S14). ), The process is terminated. On the other hand, if it is determined that δ ≦ δ0, the compressor 1 is diagnosed as not degraded (step S12; NO), the degradation diagnosis operation is terminated (step S14), and the process is terminated.

  Here, the diagnosis threshold value δ0 may use the deterioration diagnosis reference value δm as the threshold value as it is, but, for example, in the present embodiment, it is larger than the deterioration diagnosis reference value δm by a predetermined value β (for example, 0.5K) ( δ0 = δm + β [K]). In this way, by setting the diagnosis threshold value δ0 with a certain range from the deterioration diagnosis reference value δm, the influence of noise factors other than compressor deterioration (for example, fluctuations in ambient environmental conditions such as outside wind) at the time of compressor deterioration diagnosis Thus, misdiagnosis due to a change in the diagnostic index δ can be avoided.

  Further, in the present embodiment, when the determination unit 30e diagnoses once that the compressor 1 has deteriorated, it outputs a signal indicating “abnormal compressor deterioration” to the output device 50. However, the present invention is not limited to this. For example, when the diagnosis that the compressor 1 has deteriorated has reached a predetermined number of times or more, a signal indicating “abnormal compressor deterioration” may be output. By doing so, it is possible to avoid abnormal reporting due to erroneous diagnosis, and to realize highly accurate compressor deterioration diagnosis.

  Further, in the present embodiment, the process of automatically starting the compressor deterioration diagnosis from the result of monitoring the operation state is performed, but the compressor deterioration diagnosis may be forcibly started.

<Effect>
As described above, according to the air-conditioning apparatus of the present embodiment, in order to obtain a stable operating state quantity, it is necessary to diagnose deterioration of the compressor 1 that needs to maintain the rotational speed of the compressor 1 at a high state. When performing such an operation, the control unit 30 changes the set temperature of the room temperature and increases the room temperature slightly, so that the room temperature decreases due to excessive capacity during the operation related to the deterioration diagnosis. It is possible to obtain a stable operating state quantity while responding, and to perform highly accurate deterioration diagnosis processing. In addition, when the room temperature becomes lower than the predetermined temperature, the control unit stops the operation related to the deterioration diagnosis of the compressor 1, so that it does not hinder the operation such as giving uncomfortable feeling to the residents in the room.

Embodiment 2. FIG.
<Configuration of air conditioner monitoring system>
FIG. 7 is a diagram showing a configuration of an air-conditioning apparatus monitoring system 1000 according to Embodiment 2 of the present invention. The air conditioner monitoring system 1000 of the present embodiment shown in FIG. 7 is a system configured to remotely monitor the air conditioner 100 described in the first embodiment, for example. For this reason, in the system according to the present embodiment, the air conditioning apparatus 100 and the remote monitoring apparatus 200 are connected by an electric communication line 300.

  In FIG. 7, the air-conditioning apparatus 100 according to the present embodiment has the control unit 30 described in the first embodiment. In addition, the communication apparatus 102 performs communication with the outside via an electric communication line serving as the output apparatus 50 or the input apparatus 60. In addition, a display / notification device 105 for displaying and notifying an abnormality by a liquid crystal display or the like serving as the output device 50 is provided. And it has the operation input device 106, such as a touch panel used as the input device 60, a button.

  In the remote monitoring room 210, the remote monitoring apparatus 200 is comprised, for example with a computer etc., and centrally manages the air conditioning apparatus 100 by performing remote monitoring, control, etc. based on the signal sent from the air conditioning apparatus 100. The remote monitoring apparatus 200 according to the present embodiment performs part or all of the processing of the functions of the measurement unit 30a, the calculation unit 30b, the drive unit 30c, the storage unit 30d, and the determination unit 30e of the control unit 30 in the first embodiment. Do. Here, the remote monitoring device 200 includes a monitoring display device 201 that displays a monitoring state. Moreover, it has the instruction | indication input apparatus 202 for the supervisor to input the instruction | indication to the air conditioning apparatus 100. FIG.

  In FIG. 7, the remote monitoring device 200 is configured to monitor one air conditioner 100, but may monitor a plurality of air conditioners 100 connected by an electric communication line.

  In FIG. 7, the display / notification device 105 and the operation input device 106 are built in the air conditioner 100, but the present invention is not limited to this. For example, all or a part of these devices may be installed outside the air conditioner 100. Depending on the case, some or all of the display / notification device 105 and the operation input device 106 may not be provided.

  As described above, by configuring the air conditioner monitoring system 1000, it is possible to monitor deterioration (abnormal signs) of the compressor 1 mounted on the air conditioner 100 by remote monitoring. Therefore, it is possible to obtain a highly reliable air conditioner and technology such as abnormality diagnosis and monitoring.

Embodiment 3 FIG.
《Cooling device modification》
The features of the present invention have been described in the respective embodiments. For example, the contents of the refrigerant flow path configuration (piping connection), the configuration of the refrigerant circuit elements such as the compressor, the heat exchanger, the expansion valve, etc. However, the present invention is not limited to the contents described above, and can be appropriately changed within the scope of the technology of the present invention.

  Moreover, although the above-mentioned embodiment demonstrated the compressor deterioration diagnosis of the air conditioning apparatus, it is not limited to this. For example, the present invention can be applied to other refrigeration cycle apparatuses (heat pump apparatuses) that use water or the like as an object to be heated or cooled, such as a refrigeration apparatus, a refrigeration apparatus, and a hot water supply apparatus.

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Four way valve, 3 Outdoor heat exchanger, 4, 4a, 4b Expansion valve, 5, 5a, 5b Indoor heat exchanger, 6 Outdoor blower, 7, 7a, 7b Indoor blower, 11, 11a, 11b Valve, 30 control unit, 30a measurement unit, 30b calculation unit, 30c drive unit, 30d storage unit, 30e determination unit, 31 discharge pressure sensor, 32 suction pressure sensor, 40 outdoor intake air temperature sensor, 41 discharge temperature sensor, 42 Suction temperature sensor, 43, 43a, 43b Indoor intake air temperature sensor, 44, 44a, 44b Gas side temperature sensor, 45, 45a, 45b Liquid side temperature sensor, 50 output device, 60 input device, 100 air conditioner, 102 communication Device, 105 display / notification device, 106 operation input device, 200 remote monitoring device, 201 monitoring display device, 202 instruction input Device 210 remote monitoring room, 300 electric communication line, 1000 air conditioner monitoring system, A outdoor unit, B, B1, B2 indoor unit.

Claims (6)

A compressor deterioration diagnosing device for diagnosing deterioration of the compressor of a refrigeration cycle device that configures a refrigerant circuit by connecting a compressor, a condenser, a pressure reducing device, and an evaporator, and sets a target space to a set temperature. ,
A measuring unit for measuring the physical quantity detected by the detecting means;
A drive unit for controlling operation by driving at least the compressor;
A determination unit that performs deterioration diagnosis of the compressor by determination based on a measurement result of the measurement unit;
The determination unit determines whether or not to start the deterioration diagnosis operation for measuring the physical quantity related to the deterioration diagnosis of the compressor, and when determining that the deterioration diagnosis operation is started, the determination unit changes the set temperature to be high A process for causing the drive unit to perform the deterioration diagnosis operation until the temperature of the target space decreases to a predetermined temperature when it is determined that the drive unit has performed an operation for raising the temperature of the target space and the set temperature has been reached. A compressor deterioration diagnosis device characterized in that   2. The determination unit according to claim 1, wherein when the determination unit determines that there is no person in the target space, the deterioration diagnosis operation is started without causing the drive unit to perform an operation for increasing the temperature of the target space. The compressor deterioration diagnosis device described. A calculation unit that calculates a diagnostic index based on the physical quantity measured by the measurement unit in the deterioration diagnosis operation;
The determination unit sets a diagnosis reference value based on the physical quantity when the compressor is not deteriorated, compares the diagnosis threshold value based on the diagnosis reference value with the diagnosis index, and the compressor deteriorates The compressor deterioration diagnosis device according to claim 1, wherein a diagnosis process is performed to determine whether or not the compressor deterioration is detected.   The compressor deterioration diagnosis apparatus according to any one of claims 1 to 3, further comprising an output device that outputs a deterioration diagnosis result of the compressor by the determination unit.   The compression according to any one of claims 1 to 4, wherein the refrigeration cycle apparatus is communicatively connected via an electric communication line and processing is performed based on a signal sent from the refrigeration cycle apparatus. Machine deterioration diagnosis device. Start determination to determine whether or not to start a deterioration diagnosis operation for measuring a physical quantity related to the deterioration diagnosis of the compressor of a refrigeration cycle apparatus that constitutes a refrigerant circuit by connecting a compressor, a condenser, a decompression device and an evaporator. Process,
When it is determined that the deterioration diagnosis operation is to be started, an operation is performed to increase the temperature of the target space by changing the set temperature to be high, and when it is determined that the set temperature has been reached, the temperature of the target space is decreased to a predetermined temperature. A deterioration diagnosis operation step for performing the deterioration diagnosis operation in the meantime,
A compressor deterioration diagnosis method comprising: a diagnosis step of performing deterioration diagnosis of a compressor based on a physical quantity measured in the deterioration diagnosis operation.

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