JP2009293908A - Air conditioning system, and failure detecting method for air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a failure of an air conditioning system. <P>SOLUTION: The air conditioning system includes a plurality of AC fan motors, a current measuring part 114 which measures current carried to the AC fan motors, and a failure detector 116 which sets a reference value based on a current value measured by the measuring part 114, and compares the current measured value with the reference value, thereby detecting a failure of the AC current fan motors. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioner having an AC fan motor.

Conventionally, in an air conditioner having a DC motor, there has been proposed a method for detecting an abnormal operation and displaying that inspection is necessary.
JP 2003-097828 A

  However, in an air conditioner having an AC fan motor, there is no means for detecting an anomaly that is inexpensive and simple enough to be adopted, and therefore it is not possible to provide a display indicating that inspection is necessary. It was. In addition, in the case of an air conditioner having two or more AC fan motors, the system is operating even if any one of the AC fan motors has an abnormality. There was a problem that I couldn't notice.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioner and an air conditioner abnormality detection method capable of detecting an abnormality even when an AC fan motor is mounted. To do.

In order to solve the above problems, the present invention employs the following means.
The present invention is to detect an abnormality of an AC fan motor based on a plurality of AC fan motors, current measuring means for measuring a current flowing through the AC fan motor, and a current value measured by the current measuring means. A reference value setting means for setting a reference value of the current, a current value measured by the current measurement means, and a reference value set by the reference value setting means to detect an abnormality of the AC fan motor Provided is an air conditioner comprising a detecting means.

For example, the current flowing through the AC fan motor varies depending on the rotational speed of the AC fan motor. For example, as shown in FIG. 5, as the rotational speed of the AC fan motor increases, the current flowing through the AC fan motor decreases. The number of rotations of the AC fan motor varies depending on the environment in which the air conditioner is installed, for example, the physical length of the duct, the magnitude of wind pressure / static pressure, the type of air filter, and the like. Moreover, when it has various operation modes, the rotation speed of an alternating current fan motor changes also according to operation states, such as an operation mode. As described above, the current flowing through the AC fan motor differs depending on the installation site environment and operating conditions. Therefore, when detecting an abnormality in the AC fan motor based on the current value flowing through the AC fan motor, It is necessary to set an appropriate current threshold in consideration.
From such knowledge, in the present invention, the reference value setting means sets a reference value for detecting an abnormality of the AC fan motor based on the current flowing through the AC motor, and the reference value and the current value flowing through the AC fan motor. Are sequentially detected to detect an abnormality in the AC fan motor. Thereby, after installation of the air conditioner, it is possible to set an appropriate reference value (current threshold) in consideration of the installation environment and the operating state. Therefore, even when a plurality of AC fan motors are provided, it is possible to reliably detect an abnormality of the AC fan motor by sequentially comparing the reference value and the current value measured at a predetermined time interval by the current measuring means. Can be detected.
For example, the reference value setting unit sets the reference value after the operation is started. Specifically, the reference value is set using the current value after the start of operation measured by the current measuring means. The reference value is set by, for example, multiplying the current value after the start of operation by a predetermined coefficient (for example, 0.7).
Moreover, the setting of a reference value should just be performed at least once after the field installation of an air conditioning apparatus, and as above-mentioned, it does not necessarily need to be performed after every driving | operation start. A reference value may be set after installation at the site, and this reference value may be stored. In the subsequent operation, an abnormality may be detected using the stored reference value. Further, as will be described later, since the current flowing through the AC fan motor also changes depending on the operation mode, it is preferable to set a reference value corresponding to each operation mode.

In the above air conditioner, the current measuring means may be provided on a wiring through which a current input to all the AC fan motors flows or a wiring through which a current output from all the AC fan motors flows. Good.
According to such a configuration, it is not necessary to provide current measuring means for each wiring connected to each AC fan motor, and it is possible to measure the current flowing through all the AC fan motors by one current measuring means. .

In the above air conditioner, the reference value setting means may set the reference value again when the operation mode is changed.
Since the reference value is changed according to the operation mode of the air conditioner, an appropriate reference value can be set according to the operation mode, and the accuracy of abnormality detection of the AC fan motor can be further improved.

  The present invention provides a reference value setting means for setting a reference value for detecting an abnormality of the AC fan motor based on values of currents flowing through the plurality of AC fan motors, and values of currents flowing through the plurality of AC fan motors. And an abnormality detecting means for detecting an abnormality of the AC fan motor by comparing the reference value set by the reference value setting means at a predetermined time interval and detecting an abnormality of the AC fan motor I will provide a.

  The present invention measures the current flowing through a plurality of AC fan motors, sets a reference value for detecting an abnormality of the AC fan motor based on the measured current value, and sets the current flowing through the plurality of AC fan motors. An abnormality detection method for an air conditioner is provided, in which an abnormality of the AC fan motor is detected by measuring the value of the AC fan motor at predetermined time intervals and comparing the measured value with the reference value.

  According to the present invention, it is possible to detect an abnormality even when an AC fan motor is mounted.

  Hereinafter, an embodiment of an air conditioner and an air conditioner abnormality detection method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view when an air conditioner according to an embodiment of the present invention is attached to the back of a ceiling, and FIG. 2 is a cross-sectional view of FIG. As shown in FIGS. 1 and 2, the air conditioner according to the present embodiment includes a plurality of AC fan motors 110 and 111 and a heat exchanger 104 as main components.

  In such an air conditioner, external air is sucked by the operation of the AC fan motors 110 and 111, and the sucked air is sent to the heat exchanger 104 via the air filter 101 and the duct 102. The heat exchanger 104 exchanges heat with the sucked air. The air heated or cooled by the heat exchanger 104 is exhausted from the exhaust port 106 through the duct 105.

  FIG. 3 is a diagram illustrating an electrical system around the AC fan motor of the air-conditioning apparatus according to the present embodiment.

As shown in FIG. 3, AC fan motors 110 and 111 and an AC power source are connected in parallel. Each of the AC fan motors 110 and 111 includes a high rotation terminal H and a low rotation terminal L. The high rotation terminals H are connected to each other and are connected to an AC power source via the first switch 112. Similarly, the low-rotation terminals L are connected to each other and connected to an AC power source via the second switch 113.
On / off of the first switch 112 and the second switch 113 is controlled by the control device 115. The control device 115 selectively selects the first switch 112 and the second switch 113 based on information from the remote controller 117, and turns on one of them and turns off the other.

Further, a current measuring unit 114 is provided on the wiring connecting the parallel connection point of the AC fan motors 110 and 111 and the AC power source.
The current measuring unit 114 measures the current flowing through the AC fan motors 110 and 111 and outputs the measured value to the abnormality detection device 116. The abnormality detection device 116 detects an abnormality in the AC fan motors 110 and 111 based on the measurement value input from the current measurement unit 114. Specifically, the abnormality detection device 116 sets a reference value by multiplying the current measurement value measured by the current measurement unit 114 by a predetermined coefficient after the start of operation or when the operation mode is changed (reference value). The setting unit) detects an abnormality of the AC fan motor by comparing the reference value with a current value measured at a predetermined time interval by the current measuring unit 114 (abnormality detecting unit).
For example, when an abnormality occurs in any of the AC fan motors, no current flows through the AC fan motor in which an abnormality has occurred, so the current measurement value measured by the current measuring unit 114 is greater than the current that has been flowing so far. Is also quite small. Therefore, it is possible to reliably detect an abnormality in AC fan motors 110 and 111 by comparing the measured current value with the reference value.

Next, the operation of the air conditioning apparatus according to the present embodiment having the above-described configuration will be described with reference to FIGS. 3 and 4.
First, when a user operates the remote control 117 to specify an operation mode and information on operation start is input, the input information is transmitted from the remote control 117 to the control device 115. The control device 115 selects either the first switch 112 or the second switch 113 based on the operation mode received from the remote controller 117 to turn it on (step SA1 in FIG. 4), and controls according to the operation mode. A signal is output to AC fan motors 110 and 111. Hereinafter, the case where the first switch 112 is turned on and each AC fan motor starts operation in the high rotation mode will be described.

When the first switch 112 is turned on, a closed circuit is formed, and the AC fan motor starts operation at the number of revolutions corresponding to the operation mode, whereby a current corresponding to the number of revolutions flows through the closed circuit. This current is detected by the current measuring unit 114 and output to the abnormality detection device 116 (step SA2 in FIG. 4).
The abnormality detection device 116 calculates and sets a reference value by multiplying the current measurement value input from the current measurement unit 114 by a predetermined coefficient. (Step SA3 in FIG. 4). After setting the reference value, this reference value and the current measurement value input from the current measurement unit 114 at predetermined time intervals are sequentially compared to determine whether or not the current measurement value is less than the reference value ( Step SA4 in FIG. As a result, when the current measurement value falls below the reference value, it is determined whether or not the operation mode has been switched (step SA5 in FIG. 4). As a result, when the operation mode is not switched, it is displayed that there is an abnormality in the AC fan motor (step SA6 in FIG. 4), and this process is terminated.

  On the other hand, if the current measurement value is not lower than the reference value in step SA4, the process returns to step SA4 in FIG. 4 and the reference value and the current measurement value input from the current measurement unit 114 at a predetermined time interval. The process of sequentially comparing is repeated. On the other hand, when the operation mode is switched in step SA5, the reference value set in the abnormality detection device 116 is deleted, and the process returns to step SA2 in FIG. 4 to calculate and set the reference value again. Thereafter, the processing after step SA2 in FIG. 4 is repeated in the same manner as described above.

As described above, according to the air conditioning apparatus according to the present embodiment, the current flowing through the AC fan motors 110 and 111 is measured by the current measuring unit 114, and the AC fan motors 110 and 111 are based on the measured values. Since the reference value for detecting the abnormality is set, it is possible to set the reference value according to the operation mode at that time after the air conditioner is installed. As a result, even if an abnormality occurs in any of the plurality of AC fan motors 110 and 111, the abnormality can be reliably detected.
Further, according to the present embodiment, since the current measuring unit 114 is provided on the wiring through which the current output from the AC fan motors 110 and 111 flows, a current is connected to each of the wirings connected to the AC fan motors 110 and 111. There is no need to provide the measurement unit 114, and the current can be measured by one current measurement unit 114, and an inexpensive and simple configuration can be employed.

  In the embodiment of FIG. 3, an air conditioner having two AC fan motors is taken as an example, but the number of AC fan motors is not limited, and one or three or more AC fan motors may be provided.

  In the present embodiment, the reference value is set after the start of the operation of the air conditioner. However, it is not always necessary to set the reference value after the start of the operation. For example, after installing the air conditioner on site, a reference value may be set, the reference value may be stored, and an abnormality may be detected using the stored reference value in subsequent operations.

  As mentioned above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. .

It is the top view which showed an example of the air conditioning apparatus which concerns on embodiment of this invention. It is sectional drawing which showed an example of the air conditioning apparatus which concerns on embodiment of this invention. It is the circuit diagram which showed an example which measures an electric current from the alternating current fan motor which concerns on embodiment of this invention. It is the figure which showed the operation | movement flow of the inspection detection sequence process which concerns on embodiment of this invention. It is the figure which showed the relationship between the rotation speed of an alternating current fan motor, and an electric current value.

Explanation of symbols

112 1st switch 113 2nd switch 114 Current measurement part 115 Control apparatus 116 Abnormality detection apparatus

Claims (5)

A plurality of AC fan motors,
Current measuring means for measuring the current flowing through the AC fan motor;
A reference value setting means for setting a reference value for detecting an abnormality of the AC fan motor based on the current value measured by the current measuring means;
An abnormality detecting means for detecting an abnormality of the AC fan motor by comparing a current value measured at a predetermined time interval by the current measuring means with a reference value set by the reference value setting means; An air conditioner characterized.   The current measuring means is provided on a wiring through which a current input to all the AC fan motors flows or a wiring through which a current output from all the AC fan motors flows. Item 2. The air conditioner according to Item 1.   The air conditioner according to claim 1 or 2, wherein the reference value setting means sets the reference value again when the operation mode is changed. Reference value setting means for setting a reference value for detecting an abnormality of the AC fan motor based on the value of the current flowing through the plurality of AC fan motors;
Comparing a value of a current flowing through a plurality of AC fan motors with a reference value set by the reference value setting unit at a predetermined time interval, the abnormality detection unit detects an abnormality of the AC fan motor. An air conditioner anomaly detection device characterized. Measure the current flowing through multiple AC fan motors,
Based on the measured current value, set a reference value for detecting an abnormality of the AC fan motor,
An air conditioner characterized in that an abnormality of the AC fan motor is detected by measuring values of currents flowing through the plurality of AC fan motors at predetermined time intervals and comparing the measured values with the reference values. Device abnormality detection method.

Images