JP2005273995A - Refrigeration air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating air conditioning system for determining the necessity of maintenance of other portions as well as a compressor and dispensing with the need for removably incorporating a rewritable recording medium. <P>SOLUTION: A maintenance determining part 13 reads the temperatures of refrigerant detected by temperature sensors 7, 8, 9, an operation time for a first actuator (the compressor), and currents and pressure in actuators 3, 5, 6 as data via an operation control part 11. It compares them with reference values stored in a memory 12. In accordance with the comparison results, portions of the system required for maintenance are determined. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigeration air conditioner having a maintenance function.

In the conventional refrigeration and air-conditioning apparatus, a rewritable recording medium on which the operating state is recorded is detachably provided, and the status during operation is clarified from the data written on the recording medium to prevent failure of the air conditioner. This is useful (see, for example, Patent Document 1).
In addition, other conventional air conditioners incorporate a compressor life prediction device that is an important part of a refrigeration cycle, and predict the replacement time in advance by predicting the life (for example, Patent Document 2).

Japanese Patent Publication No. 7-30939 (2nd page, Fig. 1-Fig. 2) Japanese Patent Laid-Open No. 10-288379 (page 3, FIGS. 1 and 4)

In the conventional refrigerating and air-conditioning apparatus described above, it has been necessary to detachably incorporate a rewritable recording medium into the refrigerating and air-conditioning apparatus.
In addition, other conventional air conditioners are limited to compressor life prediction and have an alarm means for issuing an abnormality display signal based on life prediction. Could not do.

  The present invention has been made to solve the above-described problems. The first object is to eliminate the need to detachably install a rewritable recording medium and to predict the maintenance of parts other than the compressor. It is possible to obtain a refrigeration air conditioner capable of

  Moreover, the 2nd objective is to obtain the refrigerating air-conditioning apparatus which can continue an operation | movement, without performing the abnormal stop by the lifetime of an operation time.

The refrigerating and air-conditioning apparatus according to the present invention includes a maintenance discriminating unit that reads the operation state of the apparatus as data, compares it with a preset reference value, and discriminates a part requiring maintenance of the apparatus based on the comparison result. It is provided.
The refrigerating and air-conditioning apparatus according to the present invention reads the operating state of the apparatus at predetermined intervals as data, compares the data read earlier as past data, the data read later as current data, and compares both. A maintenance discriminating unit for discriminating a site requiring maintenance of the apparatus based on the result is provided.
Furthermore, the refrigerating and air-conditioning apparatus according to the present invention reads the memory and the operation state of the apparatus as data, calculates the amount of change of each data and stores it in the memory, and the amount of change previously stored as past data, A maintenance discriminating means is provided for comparing both of the changes stored later as current data, and discriminating a portion requiring maintenance of the apparatus based on the comparison result.
The refrigeration and air-conditioning apparatus according to the present invention further includes an emergency stop avoiding means for controlling the operation of the apparatus so that the load on the part is reduced when the part requiring maintenance of the apparatus is identified. Is.

In the present invention, the operating state of the device is read as data, compared with a preset reference value, and based on the comparison result, the portion requiring maintenance of the device is determined. It is not necessary to detachably incorporate the recording medium, and it is possible to determine a part requiring maintenance other than the compressor.
In the present invention, the operation state of the apparatus is read as data at predetermined intervals, the data read earlier is used as past data, the data read later is used as current data, and both are compared. Since the part requiring maintenance of the apparatus is determined, it is not necessary to detachably install a rewritable recording medium, and it is possible to determine a part requiring maintenance other than the compressor.
Further, in the present invention, the operation state of the apparatus is read as data, the amount of change of each data is calculated and stored in the memory, the amount of change stored earlier is used as past data, and the amount of change stored later is present. Since both are compared as data, and the part requiring maintenance of this device is determined based on the comparison result, there is no need to detachably install a rewritable recording medium, and other than the compressor It is also possible to determine a part requiring maintenance.
In addition, when a part requiring maintenance of this device is identified, the operation of this device is controlled so that the load on that part is reduced, so there is no emergency stop and it is safe until maintenance is performed. It becomes possible to carry out driving.

Embodiment 1 FIG.
FIG. 1 is a refrigeration cycle and control system diagram of a refrigeration air conditioner according to Embodiment 1 of the present invention, and FIG. 2 is a block configuration diagram of a control system of the refrigeration air conditioner according to Embodiment 1 of the present invention.
In the figure, the refrigerating and air-conditioning apparatus includes, for example, a first actuator 1 (compressor) that adiabatically compresses refrigerant gas into a superheated refrigerant gas, and a third actuator 5 (condenser fan). A condenser 2 that heats the refrigerant gas in an overheated state with the third actuator 5 isobarically released to the outside to make a refrigerant liquid, and a second actuator 3 that depressurizes the refrigerant liquid to make a wet vapor in a gas-liquid mixed state ( An expansion valve) and a fourth actuator 6 (evaporator fan), and the evaporator 4 that absorbs heat of vaporization when the wet steam of the refrigerant becomes refrigerant gas from the cooled portion by the fourth actuator 6. These are sequentially connected by piping to constitute a refrigeration cycle.

  As shown in FIG. 2, the refrigerating and air-conditioning apparatus control unit 10 includes an operation control unit 11, a memory 12, and a maintenance determination unit 13. The operation control unit 11 includes a first actuator 1 (compressor), a second actuator 3 (expansion valve), a third actuator 5 (condenser fan), a fourth actuator 6 (evaporator fan), A first temperature sensor 7 that detects the temperature of the refrigerant gas in an overheated state from the actuator 1, a second temperature sensor 8 that detects the temperature of the refrigerant condensed by the condenser 2, and the refrigerant evaporated by the evaporator 4 A third temperature sensor 9 for detecting the temperature is connected. For example, the temperature of the refrigerant detected by each temperature sensor 7, 8, 9, various sensors ( The operation of each actuator 1, 3, 5, 6 is controlled based on information (current, pressure, etc.) from (not shown). Further, the operation control unit 11 has a function of integrating the operation time and the number of operations of the first actuator 1 (compressor), for example.

  In the memory 12, for example, reference values for determining necessity of maintenance set corresponding to the temperature sensors 7, 8, 9 and the actuators 1, 3, 5, 6 are stored. The maintenance discriminating unit 13 operates the apparatus, for example, the temperature of the refrigerant detected by the temperature sensors 7, 8, 9, the accumulated operation time and the number of operations of the first actuator 1 (compressor), Currents, pressures, etc. detected by various sensors 3, 5, 6 are read as data through the operation control unit 11 and compared with respective reference values stored in the memory 12, and based on the comparison results, Identify parts that require maintenance of the device.

  In addition, the said part is the 1st actuator 1 (compressor), the 2nd actuator 3 (expansion valve), the 3rd actuator 5 (condenser fan), the 4th actuator 6 (evaporator fan) etc., for example. The current is, for example, a drive current of each actuator 1, 3, 5, 6 or a combined current thereof. The pressure is, for example, the pressure before or after the first actuator 1 (compressor) or any one of them.

Next, the operation of the first embodiment will be described with reference to FIGS.
In this apparatus, the refrigerant gas is adiabatically compressed by the compressor of the first actuator 1 to form an overheated refrigerant gas, and the overheated refrigerant gas is converted by the condenser 2 and the condenser fan of the third actuator 5. The refrigerant liquid is radiated to the outside in an isobaric manner to form a refrigerant liquid, and the refrigerant liquid is depressurized by the expansion valve of the second actuator 3 to form a wet vapor in a gas-liquid mixed state, and the evaporator 4 and the evaporator fan of the fourth actuator 6 Cooling is performed by absorbing the heat of vaporization when the wet steam of the refrigerant becomes the refrigerant gas from the portion to be cooled. At this time, the operation control unit 11 of the refrigeration air conditioner control unit 10 is based on the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and information from various sensors. Then, the first actuator 1 (compressor), the second actuator (expansion valve), the third actuator 5 (condenser fan), and the fourth actuator 6 (evaporator fan) are driven.

  On the other hand, the maintenance discriminating unit 13 operates using the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9 and information (current, pressure, etc.) from various sensors as data. The data is read via the control unit 11 and stored in the memory 12, and the accumulated operation time and the number of operations of the first actuator 1 are read as data from the operation control unit 11 and stored in the memory 12. Then, each data is compared with each reference value, and a part requiring maintenance of this apparatus is determined based on the comparison result. For example, if the refrigerant gas temperature in the overheated state detected by the first temperature sensor 7 exceeds the reference value, it is assumed that the refrigerant leaks or the refrigerant is insufficient. If the refrigerant temperature of the condensation detected by the second temperature sensor 8 exceeds the reference value, the third actuator 5 (condenser fan) and the condenser 2 are determined. Judge that maintenance is necessary. Further, for example, when the accumulated operation time or the number of operations of the first actuator 1 (compressor) exceeds a reference value, it is determined that the first actuator 1 needs maintenance.

  As described above, according to the first embodiment, the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and information (current, pressure, etc.) from various sensors. Is read as data through the operation control unit 11 and stored in the memory 12, and the accumulated operation time and the number of operations of the first actuator 1 are read as data from the operation control unit 11 and stored in the memory 12. And, each data is compared with each reference value, and based on the comparison result, the portion requiring maintenance of this apparatus is determined, so that it is not necessary to detachably incorporate a rewritable recording medium, and Further, it is possible to discriminate parts other than the compressor that require maintenance.

Embodiment 2. FIG.
In the refrigerating and air-conditioning apparatus according to Embodiment 2, the refrigerant temperature detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9 and the actuators 1 and 3 are sent to the refrigerating and air-conditioning apparatus control unit 10. , 5 and 6 from the various sensors (current, pressure, etc.) as data, read from the operation control unit 11 at predetermined intervals and stored in the memory 12, each data previously stored in the memory 12 as past data, After this, each data stored in the memory 12 is compared with each other as current data, and a maintenance discriminating unit 13 is provided for discriminating a portion requiring maintenance of the apparatus based on the comparison result.

  For example, the difference between the past refrigerant gas temperature detected by the first temperature sensor 7 and the current refrigerant gas temperature is calculated, and the calculated value is compared with a preset threshold value. When it exceeded the limit, it was determined that the leakage location of the condenser 2, the evaporator 4, the connecting piping, etc. was necessary and maintenance was necessary as refrigerant leakage or refrigerant shortage, and was detected by the second temperature sensor 8. The difference between the past refrigerant temperature and the current refrigerant temperature is calculated, and the calculated value is compared with a preset threshold value. If the calculated value exceeds the threshold value, the third actuator 5 (condenser fan) is calculated. ), It is determined that the condenser 2 needs maintenance. The aforementioned threshold value is stored as data in the memory 12.

  As described above, according to the second embodiment, the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and various types of actuators 1, 3, 5, and 6. Information (current, pressure, etc.) from the sensor is read from the operation control unit 11 at predetermined intervals as data and stored in the memory 12, and each data previously stored in the memory 12 is stored as past data in the memory 12 thereafter. Since each data is compared with each other as current data, and the part requiring maintenance of this apparatus is determined based on the comparison result, there is no need to detachably incorporate a rewritable recording medium, and Further, it is possible to discriminate parts other than the compressor that require maintenance.

Embodiment 3 FIG.
The refrigerating and air-conditioning apparatus according to Embodiment 3 has the refrigerating and air-conditioning apparatus control unit 10 send the refrigerant temperatures detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and the actuators 1 and 3. , 5, 6 information (current, pressure, etc.) is read from the operation control unit 11 as data, the amount of change of each data is calculated and stored in the memory 12, and the previously stored change A maintenance discriminating unit 13 is provided for comparing both of the amounts as past data and the change amount stored thereafter as current data, and discriminating a portion requiring maintenance of the apparatus based on the comparison result.

  For example, the change amount of the refrigerant gas temperature before and after being detected by the first temperature sensor 7 and the change amount of the refrigerant gas temperature before and after being detected thereafter are calculated and stored in the memory 12 and stored first. The difference between the change amount and the change amount stored thereafter is calculated, and the calculated value is compared with a preset threshold value.When the calculated value exceeds the threshold value, the refrigerant leaks or the refrigerant is insufficient. It is determined that it is necessary to specify a leak point such as the condenser 2, the evaporator 4, and the connection pipe and to perform maintenance. In addition, the refrigerant temperature before and after being detected by the second temperature sensor 8 and the amount of change in the refrigerant temperature before and after that detected thereafter are calculated and stored in the memory 12, and the change in the refrigerant temperature stored earlier is also calculated. The difference between the amount and the amount of change in the refrigerant temperature stored thereafter is calculated, the calculated value is compared with a preset threshold value, and if the calculated value exceeds the threshold value, the third actuator 5 (condensation) It is determined that maintenance is required for the condenser fan 2 and the condenser 2. The aforementioned threshold value is stored as data in the memory 12.

  As described above, according to the third embodiment, the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and various types of actuators 1, 3, 5, and 6. Information (current, pressure, etc.) from the sensor is read from the operation control unit 11 as data, the amount of change of each data is calculated and stored in the memory 12, and the amount of change stored previously is past data. Since the amount of change stored after this is compared as the current data, both parts are compared, and based on the comparison result, the part requiring maintenance of this apparatus is determined. Therefore, it is necessary to detachably install a rewritable recording medium. In addition, it is possible to determine a part requiring maintenance other than the compressor.

Embodiment 4 FIG.
FIG. 3 is a block configuration diagram of a control system of the refrigerating and air-conditioning apparatus according to Embodiment 4 of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 2, and description is abbreviate | omitted.
In the fourth embodiment, when the maintenance discriminating unit 13 identifies a part that requires maintenance of the apparatus, the emergency stop avoiding unit 14 that controls the operation of the apparatus so that the load on the part is reduced. It is equipped with. The emergency stop avoiding unit 14 determines the load applied to the first actuator 1 when the maintenance determining unit 13 determines that maintenance is necessary due to, for example, exceeding the accumulated operation time or the number of operations of the first actuator 1 (compressor). Is selected from the operation control patterns set in advance in the operation control unit 11, and the operation control unit 11 controls the operation.

  As described above, according to the fourth embodiment, when the maintenance discriminating unit 13 specifies a part requiring maintenance of the apparatus, the operation of the apparatus is controlled so that the load applied to the part is reduced. Therefore, the risk of an abnormal stop can be reduced until the maintenance of the part specified by the maintenance determination unit 13 is performed.

Embodiment 5 FIG.
FIG. 4 is a block configuration diagram of a control system of the refrigerating and air-conditioning apparatus according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 2, and description is abbreviate | omitted.
In the memory 12 shown in the figure, for example, a reference value for determining necessity of maintenance set corresponding to each temperature sensor 7, 8, 9 and each actuator 1, 3, 5, 6, and maintenance target The name of each part (each actuator 1, 3, 5, 6) and the predicted maintenance contents set corresponding to each part (each actuator 1, 3, 5, 6) to be maintained are stored. . When the maintenance discriminating unit 13 identifies a site requiring maintenance of the apparatus, the maintenance recommendation unit 15 reads out the predicted maintenance contents set for the site from the memory 12 and sends the predicted maintenance content to the maintenance discriminating unit 13.

  When the maintenance discriminating unit 13 identifies a part requiring maintenance, the maintenance discriminating part 13 reads the part from the memory 12 and displays it on the operation display unit 17, and the predicted maintenance content read by the maintenance recommendation unit 15 is displayed on the operation display unit. 17 is displayed. The above-described predicted maintenance contents are, for example, “refrigerant leakage or refrigerant shortage”, “filter (not shown) clogging”, etc. for the first temperature sensor 7, and for the second temperature sensor 8. Are “short cycle”, “failure of third actuator 5 (condenser fan)”, and the like. For the first actuator 1, it is “operating time life” or “operating life”.

  The maintenance completion input unit 16 is for erasing the maintenance site and the predicted maintenance content displayed on the operation display unit 17. When the maintenance completion input unit 16 is operated, the maintenance determination unit 13 displays the operation. The maintenance site and the predicted maintenance content displayed on the unit 17 are deleted. In addition, the maintenance completion input unit 16 stores the detected temperatures of the temperature sensors 7, 8, 9 stored in the memory, information from the various sensors of the actuators 1, 3, 5, 6 and maintenance history as necessary. May be deleted.

  In the fifth embodiment, during operation of the present apparatus, the maintenance discriminating unit 13 detects the temperature of each refrigerant detected by the first temperature sensor 7, the second temperature sensor 8, and the third temperature sensor 9, and the actuators 1 and 3. , 5 and 6 from the various sensors (current, pressure, etc.) are read as data through the operation control unit 11 and stored in the memory 12, and the accumulated operating time and the number of operations of the first actuator 1 are used as data. It is read from the control unit 11 and stored in the memory 12. Then, each data is compared with each reference value, and a part requiring maintenance of this apparatus is determined based on the comparison result. For example, when the refrigerant gas temperature in the overheated state detected by the first temperature sensor 7 exceeds the reference value, the condenser 2, the evaporator 4, the connecting pipe and the filter are specified, and the name is stored from the memory 12. Read out and display on the operation display unit 17. On the other hand, the maintenance recommendation unit 15 predicts maintenance contents ("refrigerant leakage or refrigerant shortage", "filter (not shown)" set in the condenser 2, the evaporator 4, the connection pipe, and the filter specified by the maintenance determination unit 13. ") Clogging") is read from the memory 12 and sent to the maintenance discriminating unit 13 to display the content of the maintenance on the operation display unit 17.

  Further, when the condensation refrigerant temperature detected by the second temperature sensor 8 exceeds the reference value, the maintenance determination unit 13 identifies the third actuator 5 (condenser fan) and the condenser 2 and names thereof. Is read from the memory 12 and displayed on the operation display unit 17. On the other hand, the maintenance recommendation unit 15 stores the predicted maintenance content (“the third actuator 5 (condenser fan) or the malfunction of the condenser 2”) set in the third actuator 5 specified by the maintenance determination unit 13 in the memory 12. And is sent to the maintenance determination unit 13 to display the maintenance content on the operation display unit 17. Further, when the accumulated operation time or the number of operations of the first actuator 1 (compressor) exceeds the reference value, the maintenance determination unit 13 identifies the first actuator 1 and reads the name from the memory 12 for operation. It is displayed on the display unit 17. On the other hand, the maintenance recommendation unit 15 reads the predicted maintenance content (“operation time life” or “operation life”) set in the first actuator 1 specified by the maintenance determination unit 13 from the memory 12, and the maintenance determination unit 13 and the operation content is displayed on the operation display unit 17.

  As described above, according to the fifth embodiment, when the maintenance discriminating unit 13 identifies a site requiring maintenance of the apparatus, the predicted maintenance content set in the site is read from the memory 12, and the maintenance discriminating unit 13 and displayed on the operation display unit 17, the user can easily know the part that needs maintenance and the maintenance contents of the predicted part, and the worker can easily cope with it. .

  In the fifth embodiment, it is described that the predicted maintenance content is displayed on the operation display unit 17 of the refrigeration air conditioner. For example, a remote control or a centralized management system installed remotely via a communication circuit It is also possible to speed up service and maintenance by reporting to For example, as shown in FIG. 5, when the maintenance determination unit 13 determines that some maintenance is necessary in the display state a which is a normal operation state, for example, “maintenance” is displayed on the display unit 19 of the remote controller 18 as in the display state b. The display changes to the display state c when the user performs a predetermined operation or the like, and the maintenance required part determined by the maintenance determination part 13 and the maintenance content recommended by the maintenance recommendation part 15 are displayed. Display. Further, when the maintenance is completed, the maintenance completion input unit 16 deletes the maintenance part and the maintenance content displayed on the display unit 19 and shifts to the display state a.

  Further, a state in which the operation is controlled by the emergency stop avoidance unit 14 may be displayed on the operation display unit 17 or the display unit 19 of the remote controller 18. In such a case, the user and the worker can easily know the part that needs maintenance and the maintenance content of the predicted part, and can be easily handled especially by the worker.

It is a refrigerating cycle and control system diagram of the refrigerating and air-conditioning apparatus in Embodiment 1 of the present invention. It is a block block diagram of the control system of the refrigeration air conditioner in Embodiment 1 of this invention. It is a block block diagram of the control system of the refrigeration air conditioner in Embodiment 4 of this invention. It is a block block diagram of the control system of the refrigeration air conditioner in Embodiment 5 of this invention. It is a state transition diagram which shows the display state of the operation display part of the remote control of a refrigeration air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st actuator, 2 Condenser, 3 2nd actuator, 4 Evaporator, 5 3rd actuator, 6 4th actuator, 7 1st temperature sensor, 8 2nd temperature sensor, 9 3rd temperature sensor, 10 Refrigeration air conditioner Control part, 11 Operation control part, 12 Memory, 13 Maintenance discrimination part, 14 Emergency stop avoidance part, Operation display part, 15 Maintenance recommendation part, 16 Maintenance completion input part, 17 Operation display part, 18 Remote control, 19 Display part.

Claims (6)

  A refrigerating / air-conditioning system comprising a maintenance determining means for reading the operating state of the apparatus as data, comparing it with a preset reference value, and determining a portion requiring maintenance of the apparatus based on the comparison result apparatus.   The operation status of this equipment is read as data at predetermined intervals, the data read earlier is used as past data, the data read later is used as current data, and both are compared. Based on the comparison results, maintenance of this equipment is required. A refrigerating and air-conditioning apparatus comprising a maintenance discrimination means for discriminating a part. Memory,
Read the operating status of this device as data, calculate the amount of change for each data, store it in the memory, compare the previously stored change amount as past data, and the later stored change amount as current data. A refrigerating and air-conditioning apparatus comprising a maintenance discriminating unit that discriminates a portion of the apparatus that requires maintenance based on the comparison result.   The emergency stop avoiding means for controlling the operation of the apparatus so as to reduce the load applied to the part when the part requiring maintenance of the apparatus is specified is provided. The refrigeration air conditioning apparatus in any one. Display means;
Predictive maintenance contents set for each maintenance target part of this device are stored as data, and when a part requiring maintenance of this equipment is specified, the predicted maintenance contents set for that part are displayed. A maintenance recommendation means for searching from the data,
5. The maintenance determination unit according to claim 1, wherein when the part requiring maintenance is specified, the part is displayed on the display unit, and the searched maintenance content is displayed on the display unit. A refrigeration air conditioner according to claim 1. 6. The refrigerating and air-conditioning apparatus according to claim 5, wherein the emergency stop avoiding means displays the fact on the display means when control is performed so that no load is applied to a portion requiring maintenance.

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