JP2019147102A - Air cleaner - Google Patents

Abstract

To provide an air cleaner which determines whether an excess current is caused by a short-circuit fault or by moisture absorption of deposits, without using humidity detection means, and which rapidly notifies of abnormality when a short-circuit failure occurs.SOLUTION: An air cleaner 50 includes: an electrical dust collector 5 which charges dust passing a discharge space formed by applying voltage between electrodes, and adsorbs the charged dust to electrically collect dust; a measuring unit which measures an electrical characteristic value between the electrodes of the electrical dust collector 5; and a control unit 10 which controls the electrical dust collector 5. The control unit 10 determines whether the electrical dust collector 5 has a short-circuit fault, on the basis of a magnitude relation between a first reference value, and a change amount of the electrical characteristic value that is an amount changed by the electrical characteristic value measured by the measuring unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air cleaner equipped with an electric dust collector.

  In electrostatic dust collection, a discharge space is formed by applying a high voltage of about 10 kV between metal electrodes, and dust in the air passing through the discharge space is charged positively or negatively. Thereafter, the charged dust is adsorbed and collected by Coulomb force when passing through the dust collection filter. The dust collection filter may be charged to a ground potential or a potential having a polarity opposite to that of dust.

  An air cleaner equipped with an electric dust collector has a safety function in the event of a short circuit failure in the discharge part. The safety function when the discharge unit has a short circuit failure is a function of stopping the discharge of the electrostatic precipitator when an overcurrent is detected, and a function of notifying the user or administrator of the abnormality.

  Here, the short circuit failure is a state in which an overcurrent flows because the electrodes are short-circuited or the distance between the electrodes is remarkably shortened due to disconnection or deformation of the electrodes in the discharge part. When a short-circuit failure occurs, the discharge space cannot be formed, so that the dust collection function cannot be exhibited.

  In the invention disclosed in Patent Document 1, when overcurrent is detected, high voltage application to the discharge unit is stopped, but after a certain time, a high voltage is applied again to confirm whether the overcurrent is eliminated. When the number of retries exceeds the threshold number of times, the electric dust collector is stopped without retrying and an abnormality is notified.

  When the electrostatic precipitator is exposed to high humidity, deposits such as dust or water-soluble chemicals absorb moisture, and an overcurrent due to current flowing through the absorbed deposits may be detected. In the invention disclosed in Patent Document 2, humidity detection means such as a humidity sensor is mounted on an air cleaner equipped with an electric dust collector, and when the humidity sensor detects a humidity higher than the reference humidity, the moisture absorption of the adhering matter is performed. It is determined that the overcurrent is caused by the short-circuit failure abnormality notification. That is, the invention disclosed in Patent Document 2 is equipped with a humidity detection means such as a humidity sensor, and notifies an abnormality only when an overcurrent is detected at a reference humidity or lower.

JP 2007-147181 A Japanese Patent Laid-Open No. 11-90270

  The invention disclosed in Patent Document 1 determines whether the current is an overcurrent due to a short-circuit failure or an overcurrent due to moisture absorption by an attached substance based on the duration of the retry. However, the period required for the humidity to decrease varies depending on the use environment, and also varies depending on the season even in the same environment. Therefore, when the time when the humidity decreases is longer than the expected time, it may be determined that the short circuit has been detected in spite of the overcurrent due to moisture absorption of the deposit, and the abnormality notification may be erroneously reported. . Moreover, in order to ensure the time when humidity falls reliably, it is necessary to perform retry over a long period of time. Therefore, the invention disclosed in Patent Document 1 cannot immediately notify the user or administrator of an abnormality even if a short circuit failure occurs.

  Even if a short circuit failure occurs, the invention disclosed in Patent Document 2 does not notify the abnormality if the humidity is higher than the reference humidity. Cannot be notified. Moreover, since it is necessary to mount a humidity detection means, the product size of an air cleaner will increase.

  The present invention has been made in view of the above, and can determine whether it is an overcurrent due to a short-circuit failure or an overcurrent due to moisture absorption of an adhering substance without using a humidity detection means, and when a short-circuit failure occurs The purpose is to obtain an air purifier that can promptly notify abnormality.

  In order to solve the above-described problems and achieve the object, an air cleaner according to the present invention charges dust passing through a discharge space formed by applying a voltage between electrodes and adsorbs the charged dust. An electric dust collector that performs electrostatic dust collection, a measurement unit that measures an electrical characteristic value between electrodes of the electric dust collector, and a control unit that controls the electric dust collector. The control unit determines whether or not the electric dust collector has a short circuit failure based on the magnitude relationship between the change amount of the electrical property value, which is the amount of change of the electrical property value measured by the measurement unit, and the first reference value. Determine.

  According to the present invention, it is possible to determine whether it is an overcurrent due to a short-circuit failure or an overcurrent due to moisture absorption of an adhering substance without using a humidity detection means, and it is possible to immediately notify an abnormality when a short-circuit failure occurs Play.

Sectional drawing of the air cleaner concerning Embodiment 1 of this invention. The figure which shows the function structure of the air cleaner concerning Embodiment 1 of this invention. The characteristic view which shows an example of transition of the detected electric current value in case the control part concerning Embodiment 1 of this invention selects an operation mode and a stop mode. The characteristic view which shows an example of transition of the detection electric current value in case the control part concerning Embodiment 1 of this invention selects abnormal mode at the time of an operation mode. The characteristic view which shows an example of transition of the detection electric current value in case the control part concerning Embodiment 1 of this invention selects abnormal mode at a stop mode The characteristic view which shows an example of transition of the detection electric current value in case the control part concerning Embodiment 1 of this invention selects standby mode at the time of an operation mode. The characteristic view which shows an example of transition of the detection electric current value in case the control part concerning Embodiment 1 of this invention selects standby mode at a stop mode The characteristic view which shows an example of transition of the detected electric current value in case the control part concerning Embodiment 1 of this invention selects abnormal mode at the time of retry operation of standby mode The flowchart which shows the flow of control of the control part of the air cleaner concerning Embodiment 1 of this invention. The characteristic view which shows an example of transition of the detection electric current value in case the air cleaner concerning Embodiment 2 of this invention selects standby mode based on 2nd threshold current value increase amount at the time of operation mode. The flowchart which shows the flow of control of the control part of the air cleaner concerning Embodiment 2 of this invention. The characteristic view which shows an example of transition of the detection electric current value in case the air cleaner concerning Embodiment 3 of this invention selects abnormal mode based on a 2nd threshold current value at the time of standby mode. The flowchart which shows the flow of control of the control part of the air cleaner concerning Embodiment 3 of this invention.

  Below, an air cleaner concerning an embodiment of the invention is explained in detail based on a drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of an air cleaner 50 according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating a functional configuration of the air cleaner 50 according to the first embodiment of the present invention. The air cleaner 50 according to the first embodiment includes a fan 1 including an electric motor 1a and an impeller 1b, an air supply port 2 that takes in indoor air as the impeller 1b rotates, and purified indoor air from the room. The exhaust port 3 for supplying air to the air outlet 4, the air passage 4 for guiding the room air taken in from the air intake port 2 to the air outlet 3, and being arranged in the middle of the air passage 4, And an electric dust collector 5 that performs dust collection and cleans it. The air purifier 50 also includes a remote controller 6 for remote operation, a dust sensor 7 that measures the amount of dust in room air, and an electrode of the electric dust collector 5 to detect a short circuit between the electrodes of the electric dust collector 5. From a remote controller 6, a current sensor 9 for measuring an electrical characteristic value between them, measuring a current value of a current flowing between electrodes of the electrostatic precipitator 5, and outputting current value information as a measurement result The control unit 10 controls the fan 1, the electrostatic precipitator 5, and the lamp 8 based on the operation command, the measurement result of the dust sensor 7 provided in the remote controller 6, and the current value information from the current sensor 9.

  The remote controller 6 notifies the user of the short-circuit failure when the dust sensor 7 that measures the amount of dust in the indoor air and the information that the electric dust collector 5 is in the short-circuit failure state are acquired from the control unit 10 through communication. A lamp 8 is provided. The lamp 8 may be a light emitting diode (LED), but is not limited thereto. In the following drawings, the remote controller may be abbreviated as a remote controller. The operation command from the remote controller 6 is an instruction by operating the remote controller 6.

  The control unit 10 can communicate with the fan 1, the electric dust collector 5, the remote controller 6, the dust sensor 7, and the current sensor 9. The control unit 10 is equipped with a storage element 11 that is a storage unit that stores current value information received from the current sensor 9. Further, based on the operation command received from the remote controller 6, the measured amount of dust received from the dust sensor 7, the current value information received from the current sensor 9 and the past current value information read from the storage element 11. A processing circuit 12 that determines the operation contents of the fan 1 and the electric dust collector 5 and transmits a control signal is mounted. The control unit 10 controls the fan 1 and the electric dust collector 5 that are components of the air purifier 50 based on a control signal transmitted from the processing circuit 12.

  The processing circuit 12 also stops the electrostatic precipitator 5 in the case of overcurrent detection due to short-circuit failure or overcurrent detection due to moisture absorption of adhering matter, control mode selection processing, or overcurrent detection due to short-circuit failure. Thus, a logic circuit that implements control in the control unit 10 described below, such as processing for notifying abnormality, is incorporated.

  When the processing circuit 12 is an arithmetic unit, the electric dust collector 5 is selected in the case of overcurrent detection due to short-circuit failure or overcurrent detection due to moisture absorption of adhering matter, control mode selection processing, and overcurrent detection due to short-circuit failure. The process of stopping and notifying abnormality is realized by software, firmware, or a combination of software and firmware.

  The electric dust collector 5 includes a metal positive electrode to which a high voltage of about 10 kV is applied and a metal ground electrode having a potential equal to the ground potential. The electric dust collector 5 charges the dust passing through the discharge space by forming a discharge space between the plus electrode and the ground electrode. In the electrostatic precipitator 5, a conductive dust collecting filter having a potential equal to the ground potential is disposed in the air passage downstream from the discharge space, and the charged dust is adsorbed to the ground electrode and the dust collecting filter by Coulomb force. Let it collect.

  The control unit 10 receives the current value information output from the current sensor 9 to monitor the current value that is the magnitude of the current flowing between the electrodes of the electrostatic precipitator 5, and the current value is the first threshold current value. When it becomes above, it determines with an overcurrent. An example of the first threshold current value is 200 mA.

  The first threshold current value is a threshold value for determining whether or not the electrostatic precipitator 5 is overcurrent as compared with the current value measured by the current sensor 9. The first threshold current value is a second reference value for determining whether or not the electrostatic precipitator 5 is overcurrent as compared with the electrical characteristic value measured by the measurement unit.

  Here, the overcurrent is a state in which a current value increases due to a leakage current flowing without forming a discharge space between the electrodes of the electrostatic precipitator 5. When the overcurrent is generated, the electric dust collector 5 cannot exhibit the air cleaning function. The first threshold current value is set to a current upper limit value in a range where no leakage current flows when a discharge space is formed between the electrodes of the electrostatic precipitator 5. As the current upper limit value, a value obtained in advance by performance evaluation of the air purifier 50 is used.

  Hereinafter, the current value information of the current flowing between the electrodes of the electrostatic precipitator 5 received by the control unit 10 from the current sensor 9 is referred to as a detected current value. Further, the control unit 10 stores the detected current value in the storage element 11. The control unit 10 compares the detected current value stored in the storage element 11 with the current detected current value, thereby calculating the amount of increase in the current value of the current flowing between the electrodes of the electrostatic precipitator 5. That is, the control unit 10 calculates the amount of increase in the detected current value between the detected current value stored in the storage element 11 and the current detected current value.

  The calculation method of the increase amount of the current value is for the past several times stored in the storage element 11 other than comparing the past detection current value stored in the storage element 11 and the current detection current value. A method of calculating the slope of the current increase amount using the detected current value and the current detected current value may be used, and is not limited to a specific method. In addition, the detection current value stored in the storage element 11 and the current value used for calculation of the increase amount of the current value are intended to prevent erroneous determination due to fluctuation of the detection current value due to noise applied to the current sensor 9 or the like. Thus, the average value of the current values detected a plurality of times may be used.

  The air cleaner 50 according to the first embodiment has the following four control modes. The first control mode is an operation mode. The operation mode is a state in which an operation command from the remote controller 6 is an operation, and a high voltage is applied to the electric dust collector 5 to collect dust. During the operation mode, the current sensor 9 measures the value of the current flowing between the electrodes of the electrostatic precipitator 5 at a time interval significantly shorter than that in the stop mode described later. Further, during the operation mode, the control unit 10 calculates the increase amount of the current value at the same time. However, the timing for calculating the increase amount of the current value is not necessarily synchronized with the timing when the current sensor 9 measures the current value. An example of a time interval at which the current sensor 9 measures the current value during the operation mode is 100 milliseconds. That is, the current sensor 9 measures a current value every 100 milliseconds.

  The second control mode is a stop mode. The stop mode is a state in which the electric dust collector 5 is stopped because the operation command from the remote controller 6 is stopped. During the stop mode, a retry operation is performed to check whether the overcurrent has been eliminated. That is, during the stop mode, the current value is measured and controlled by the current sensor 9 by performing an intermittent operation in which the electrostatic precipitator 5 is operated only for a period required for measuring the current value flowing between the electrodes at a predetermined time. The increase amount of the current value in the unit 10 is calculated. Then, based on the calculated increase in current value, the electrostatic precipitator 5 determines that an overcurrent has occurred due to moisture absorption of the deposit and shifts to a standby mode to be described later, or determines that a short-circuit failure has occurred and will be described later. It is determined whether the transition to the abnormal mode is performed or whether the stop mode is continued by determining that no overcurrent has occurred. An example of the predetermined time is 10 minutes.

  The third control mode is an abnormal mode. In the abnormal mode, the electrostatic precipitator 5 is in a short-circuit failure state, and the electrostatic precipitator 5 is stopped and an abnormality is notified by the lamp 8 mounted on the remote controller 6.

  The fourth control mode is a standby mode. In the standby mode, the operation command from the remote controller 6 is an operation, but the control unit 10 detects an overcurrent and determines that the cause of the overcurrent is moisture absorption of the deposits, so the electric dust collector 5 is stopped. State. During the standby mode, a retry operation is performed to check whether the overcurrent has been eliminated. That is, during the standby mode, an intermittent operation is performed in which the electrostatic precipitator 5 is operated only for a period required for measuring the current value flowing between the electrodes at a predetermined time, and the current value is measured by the current sensor 9 and the control unit. The amount of increase in current value at 10 is calculated. Then, the electrostatic precipitator 5 determines that an overcurrent has occurred due to moisture absorption of the deposit based on the calculated increase in current value, and continues the standby mode, or determines that a short-circuit failure has occurred and transitions to the abnormal mode. Or whether it is determined that no overcurrent has occurred and transition to the operation mode or the stop mode is performed. An example of the predetermined time is 10 minutes.

  When the detected current value becomes less than the first reference value during the retry operation in the standby mode, the control unit 10 determines that the air purifier 50 has returned to a state where the air purifying function can be exhibited, and the remote controller 6 The operation mode or stop mode is entered in accordance with the operation command received from. The controller 10 does not notify the abnormality by the lamp 8 in the standby mode.

  When the detected current value is less than the first threshold current value, the control unit 10 determines that the electric dust collector 5 is in a state where dust can be collected normally, and selects the operation mode or the stop mode. On the other hand, when the detected current value is equal to or greater than the first threshold current value, the control unit 10 determines that the electric dust collector 5 is in a state where dust cannot be normally collected, and selects the abnormal mode or the standby mode.

  When the detected current value is equal to or greater than the first threshold current value, the control unit 10 determines that the electric dust collector 5 has a short-circuit failure when the increase in the current value is equal to or greater than the first threshold current value increase. To select the abnormal mode. In the case where the detected current value is equal to or greater than the first threshold current value, the control unit 10 generates an overcurrent due to moisture absorption of the deposit when the increase amount of the current value is less than the first threshold current value increase amount. The standby mode is selected. That is, the control unit 10 selects one of the four control modes described above based on the detected current value and the calculated increase amount of the current value.

  The first threshold current value increase amount is used to determine whether or not the electric dust collector 5 has a short circuit failure compared to the increase amount of the current value, which is the amount by which the current value measured by the current sensor 9 has changed. It is a threshold value. Then, the first threshold current value increase amount is compared with the change amount of the electrical characteristic value, which is the change amount of the electrical property value measured by the measurement unit, and whether or not the electric dust collector 5 has a short circuit failure. Is a first reference value for determining. An example of the first threshold current value increase amount is 250 mA / 10 minutes.

  Here, the difference between the detection of an overcurrent due to a short-circuit failure and the detection of an overcurrent due to moisture absorption of the deposit will be described. In the case of an overcurrent due to a short circuit failure, the resistance value between the electrodes of the electrostatic precipitator 5 suddenly becomes approximately 0Ω from the normal value. For this reason, compared with the case of the overcurrent by moisture absorption of a deposit | attachment, a detection current value increases rapidly. An example of a normal value of the resistance value between the electrodes is 100 MΩ or more. An example of a change in the detected current value when the detected current value increases rapidly is 1000 mA / 1 second.

  On the other hand, in the case of an overcurrent due to moisture absorption of the deposit, the resistance value between the electrodes of the electrostatic precipitator 5 gradually decreases according to the amount of moisture absorbed by the deposit. For this reason, the detected current value gradually increases as compared with the case of the short circuit failure. An example of a change in the detected current value when the detected current value increases gently is 0.01 mA / 1 second. The control unit 10 can determine whether a short circuit failure has been detected or an overcurrent due to moisture absorption by the attached matter has been detected based on the difference in the increase amount of the current value described above.

  The upper limit of the increase amount of the current value of the current flowing between the electrodes of the electrostatic precipitator 5 that increases due to the moisture absorption of the deposit is determined in advance by the performance evaluation of the air cleaner 50. An example of the upper limit value of the increase amount of the current value is 200 mA / 10 minutes. The 250 mA / 10 minutes shown as an example of the first threshold current value increase amount in the above is an example of the upper limit value of the increase amount of the current value in consideration of the current measurement error in the current sensor 9 and the like. It is set to a value higher than a certain 200 mA / 10 minutes.

  FIG. 3 is a characteristic diagram illustrating an example of transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the operation mode and the stop mode. In the example shown in FIG. 3, the detected current value is always lower than the first threshold current value that is the second reference value. Therefore, the control unit 10 selects the operation mode or the stop mode according to the operation command from the remote controller 6.

  FIG. 4 is a characteristic diagram illustrating an example of transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the abnormal mode during the operation mode. FIG. 5 is a characteristic diagram illustrating an example of the transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the abnormal mode during the stop mode.

  4 and 5, the detected current value that has changed from the state below the first threshold current value, which is the second reference value, to the state above the first threshold current value is both increased by the first threshold current value. Located above the amount. That is, in both the example shown in FIG. 4 and the example shown in FIG. 5, the detected current value is changed when the detected current value changes from a state less than the first threshold current value to a state equal to or higher than the first threshold current value. Compared to the case of overcurrent due to moisture absorption, the amount of increase in current value is greater than or equal to the first threshold current value increase amount that is the first reference value. Therefore, in both the example shown in FIG. 4 and the example shown in FIG. 5, the control unit 10 determines that the electric dust collector 5 has a short circuit failure and selects the abnormal mode.

  FIG. 6 is a characteristic diagram illustrating an example of transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the standby mode during the operation mode. FIG. 7 is a characteristic diagram illustrating an example of the transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the standby mode during the stop mode.

  6 and 7, the detected current value that has changed from a state below the first threshold current value, which is the second reference value, to a state above the first threshold current value is both the first reference value. It is located below the first threshold current value increase amount. That is, in both the example shown in FIG. 6 and the example shown in FIG. 7, when the detected current value changes from a state below the first threshold current value to a state above the first threshold current value, a short circuit failure occurs. As compared with the case of (1), the current value increases slowly, and the increase amount of the current value is less than the first threshold current value increase amount. Therefore, in any of the example shown in FIG. 6 and the example shown in FIG. 7, the control unit 10 determines that an overcurrent due to moisture absorption of the deposit has occurred, and selects the standby mode.

  In the example shown in FIG. 6, the control unit 10 performs the retry operation by causing the electrostatic precipitator 5 to intermittently operate, for example, every 10 minutes in the standby mode. When the detected current value becomes less than the second reference value during the retry operation in the standby mode, the control unit 10 determines that the air purifier 50 has returned to a normal state in which the air purifying function can be exhibited, and the remote controller 6 shifts to the operation mode according to the operation command received from 6. Therefore, the control unit 10 performs control in the standby mode when detecting an overcurrent due to moisture absorption of the deposit during the operation mode. And the control part 10 returns to the operation mode automatically after the humidity of the use environment of the air cleaner 50 falls by performing retry operation at the time of standby mode, and the air purification function is again performed without falsely reporting an abnormality. Can demonstrate.

  In the example illustrated in FIG. 7, the control unit 10 performs the retry operation by causing the electrostatic precipitator 5 to intermittently operate, for example, every 10 minutes in the standby mode. When the detected current value becomes less than the second reference value during the retry operation in the standby mode, the control unit 10 determines that the air purifier 50 has returned to a normal state in which the air purifying function can be exhibited, and the remote controller 6 shifts to the stop mode according to the operation command received from 6. Therefore, the control part 10 performs control in standby mode, when the overcurrent by moisture absorption of a deposit | attachment is detected at the stop mode. And the control part 10 can return to stop mode automatically after the fall of the humidity of the use environment of the air cleaner 50 by performing retry operation at the time of standby mode.

  FIG. 8 is a characteristic diagram illustrating an example of the transition of the detected current value when the control unit 10 according to the first embodiment of the present invention selects the abnormal mode during the retry operation in the standby mode. In FIG. 8, the detected current value during the first retry operation and the second retry operation gradually increases, and the first threshold current value increase in which the increase amount of the current value is the first reference value. Less than the amount. Therefore, the control unit 10 determines that an overcurrent has occurred due to moisture absorption of the deposit, and selects the standby mode. On the other hand, the detected current during the third retry operation increases rapidly, and the increase amount of the current value is equal to or greater than the first threshold current value increase amount. Therefore, the control unit 10 determines that the electric dust collector 5 has a short circuit failure and selects the abnormal mode.

  Below, control in the control part 10 of the air cleaner 50 concerning this Embodiment 1 is demonstrated. FIG. 9 is a flowchart showing a control flow of the control unit 10 of the air cleaner 50 according to the first embodiment of the present invention. The flowchart of FIG. 9 has control for determining whether or not the air cleaner 50 has a short circuit failure depending on whether or not the increase amount of the current value is greater than or equal to the first threshold current value increase amount.

  When the power of the air cleaner 50 is turned on, in step S1, the control unit 10 performs control parameter initialization processing. In the initialization processing, the control unit 10 performs processing for stopping the fan 1, processing for stopping the electric dust collector 5, processing for setting the control mode to the stop mode, and time until the retry operation is performed in the stop mode. A standby mode timer that sets the set time of the stop mode timer to be measured to the first threshold time that is a predetermined time and clears the measured time to start, and measures the time until the retry operation is performed in the standby mode Is set to a second threshold time which is a predetermined time, and a process of setting the past detected current value stored in the storage element 11 to 0 mA is performed. The stop mode timer and the standby mode timer are provided in the control unit 10.

  The time until the retry operation is performed in the stop mode can be restated as the standby time until the control mode selection determination is performed again in the stop mode in which the electrostatic precipitator 5 is stopped. Therefore, the process of setting the set time of the stop mode timer to the first threshold time can be rephrased as the process of setting the waiting time until the control mode selection determination is performed again in the stop mode to the first threshold time. An example of the first threshold time is 10 minutes.

  The time until the retry operation is performed in the standby mode can be rephrased as the standby time until the control mode selection determination is performed again in the standby mode in which an overcurrent due to moisture absorption by the attached matter is detected. Therefore, the process of setting the set time of the standby mode timer to the second threshold time can be rephrased as the process of setting the standby time until the control mode selection determination is performed again in the standby mode to the second threshold time. An example of the second threshold time is 10 minutes.

  Next, in step S2, the control unit 10 confirms whether or not the control mode is an abnormal mode. If the control mode is an abnormal mode, Yes is made in step S2, the current state is maintained, and the process returns to step S2. If the control mode is not the abnormal mode, No is determined in step S2, and the process proceeds to step S3.

  In step S3, the control unit 10 determines whether or not the control mode is a standby mode. If the control mode is the standby mode, “Yes” is determined in step S3 and the process proceeds to step S4. If the control mode is the operation mode or the stop mode, No is determined in step S3, and the process proceeds to step S5.

  In step S4, the control unit 10 determines whether or not the measurement time of the standby mode timer is equal to or longer than the second threshold time. Here, since the second threshold time is 10 minutes, the control unit 10 determines whether or not the measurement time of the standby mode timer is 10 minutes or more. If the measurement time by the standby mode timer is less than 10 minutes, No in step S4, and the process returns to step S2. On the other hand, if the measurement time by the standby mode timer is 10 minutes or more, Yes in step S4 and the process proceeds to step S9.

  In step S5, it is determined whether or not the operation command from the remote controller 6 is driving. If the operation command from the remote controller 6 is stopped, No in step S5, and the process proceeds to step S6. On the other hand, if the operation command from the remote controller 6 is a driving | operation, it will become Yes at step S5 and will progress to step S8.

  In step S6, the control unit 10 stops the fan 1 and proceeds to step S7. Since the fan 1 is stopped immediately after the air cleaner 50 is turned on, the process proceeds to step S7 without performing step S6.

  In step S7, the control unit 10 determines whether or not the time measured by the stop mode timer is equal to or longer than the first threshold time. Here, since the first threshold time is 10 minutes, the control unit 10 determines whether or not the measurement time by the stop mode timer is 10 minutes or more. If the measurement time by the stop mode timer is less than 10 minutes, No in step S7, and the process returns to step S2. On the other hand, if the measurement time by the stop mode timer is 10 minutes or more, Yes in step S7, and the process proceeds to step S9.

  In step S8, the control unit 10 operates the fan 1 and proceeds to step S9. When the fan 1 is operating, step S8 is not performed and the process proceeds to step S9.

  In Step S9, control part 10 operates electric dust collector 5, and progresses to Step S10. Then, the control unit 10 does not detect the current during the third threshold time from when the operation of the electrostatic precipitator 5 is started until the current between the electrodes of the electrostatic precipitator 5 is stabilized.

  That is, in step S <b> 10, the control unit 10 determines whether the third threshold time has elapsed after the operation of the electrostatic precipitator 5. An example of the third threshold time is 300 milliseconds. Here, since the third threshold time is 300 milliseconds, the control unit 10 determines whether or not 300 milliseconds have elapsed after the operation of the electrostatic precipitator 5. The elapsed time after the operation of the electric dust collector 5 is measured by an operation time timer provided in the control unit 10.

  If the elapsed time after the operation of the electrostatic precipitator 5 is less than 300 msec, No in step S10, and the process returns to step S2. On the other hand, if the elapsed time after the operation of the electrostatic precipitator 5 is 300 milliseconds or more, Yes is determined in step S10, and the process proceeds to step S11.

  In step S11, the control unit 10 determines whether or not the detected current value is equal to or greater than a first threshold current value that is a second reference value. If the detected current value is less than the first threshold current value, the result of step S11 is No, and the control unit 10 determines that the electric dust collector 5 can normally collect dust, and proceeds to step S12. If the detected current value is greater than or equal to the first threshold current value, the result of step S11 is Yes, and the control unit 10 determines that the electric dust collector 5 cannot normally collect dust, and proceeds to step S22.

  In step S12, the control unit 10 determines whether or not the operation command from the remote controller 6 is driving. If the operation command from the remote controller 6 is a driving | operation, it will become Yes at step S12 and will progress to step S13. On the other hand, if the operation command from the remote controller 6 is stopped, No in step S12, and the process proceeds to step S17.

  In step S13, the control unit 10 sets the control mode to the operation mode and proceeds to step S14. In step S14, the control unit 10 records the detected current value detected every 100 milliseconds by the current sensor 9 in the storage element 11, and proceeds to step S15. In step S15, the control unit 10 operates the fan 1 and proceeds to step S16. In Step S16, control part 10 operates electric dust collector 5, and returns to Step S2.

  In step S17, the control unit 10 sets the control mode to the stop mode and proceeds to step S18. In step S18, the control unit 10 records the detected current value measured every 10 minutes by the current sensor 9 in the storage element 11, and proceeds to step S19. In step S19, the control unit 10 stops the fan 1 and proceeds to step S20. In Step S20, control part 10 stops electric dust collector 5, and progresses to Step S21. In step S21, the control unit 10 clears and starts the stop mode timer, and returns to step S2.

  In step S22, the control unit 10 determines whether or not the increase amount of the current value measured by the current sensor 9, that is, the increase amount of the detected current value is equal to or greater than the first threshold current value increase amount that is the first reference value. judge. If the increase amount of the current value is equal to or greater than the first threshold current value increase amount, the determination in Step S22 is Yes, the control unit 10 determines that the overcurrent is detected due to the short circuit failure, and the process proceeds to Step S23. On the other hand, if the increase amount of the current value is less than the first threshold current value increase amount, No is determined in step S22, and the control unit 10 determines that the overcurrent is detected due to moisture absorption of the attached matter, and proceeds to step S27.

  In step S23, the control unit 10 sets the control mode to the abnormal mode and proceeds to step S24. In step S24, the control unit 10 stops the fan 1 and proceeds to step S25. In step S25, the control unit 10 stops the electric dust collector 5 and proceeds to step S26. In step S26, the control part 10 transmits the information to the effect that the electrostatic precipitator 5 is a short circuit fault state to the remote controller 6 by communication, and returns to step S2. In addition, the remote controller 6 which acquired the information that the electric dust collector 5 is a short circuit failure state by communication blinks the lamp | ramp 8, and notifies an abnormality to a user.

  In step S27, the control unit 10 sets the control mode to the standby mode and proceeds to step S28. In step S28, the control unit 10 records the detected current value measured every 10 minutes by the current sensor 9 in the storage element 11, and proceeds to step S29. In step S29, the control unit 10 continues the operation of the fan 1 and proceeds to step S30 in order to prevent moisture from staying in the electrode unit of the electrostatic precipitator 5. However, the fan 1 may be stopped if it is not necessary to prevent moisture retention. In Step S30, control part 10 stops electric dust collector 5, and progresses to Step S31. In step S31, the control unit 10 clears the standby mode timer and returns to step S2.

  In the series of flow from step S21 in the above-described flow, steps S2 to S7 are repeated until the time measured by the stop mode timer has exceeded the first threshold time of 10 minutes, and when 10 minutes have elapsed, from step S7 to step S7. The operation proceeds to S9, the electric dust collector 5 is operated, and after each process described above is performed, the retry operation is repeated to repeat the process of stopping the electric dust collector 5 in step S20. In the series of steps from step S31 in the above-described flow, steps S2 to S4 are repeated until the time measured by the standby mode timer has exceeded the second threshold time of 10 minutes, and when 10 minutes have elapsed, step S4 is reached. From step S9, the electrostatic precipitator 5 is operated, and after each process described above is performed, a retry operation is repeated in which the electric precipitator 5 is stopped in step S30.

  As described above, the air cleaner 50 according to the first embodiment charges the dust passing through the discharge space formed by applying a voltage between the electrodes, and adsorbs the charged dust to collect electricity. It has a dust collector 5, a current sensor 9 that is a measurement unit that measures a current value that is an electrical characteristic value between electrodes of the electrostatic dust collector 5, and a control unit 10 that controls the electric dust collector 5. Then, the control unit 10 measures the magnitude relationship between the current value that is the electrical characteristic value measured by the current sensor 9 and the first threshold current value that is the second reference value, and is measured by the current sensor 9. It is determined whether or not the electric dust collector 5 has a short circuit failure based on the magnitude relationship between the increase amount of the current value that is the change amount of the electrical characteristic value and the first threshold current value increase amount that is the first reference value. To do. As a result, the air cleaner 50 does not use humidity detection means and is in a high humidity state, but the state occurring in the air cleaner 50 is an overcurrent due to a short-circuit failure or an overcurrent due to moisture absorption of the deposits. If it is determined that the electric dust collector 5 has a short circuit failure, the user can be immediately notified of the abnormality.

  Further, when it is determined that the electrostatic precipitator 5 is not short-circuited, the control unit 10 generates a current value that is an electrical characteristic value measured by the current sensor 9 and a first threshold current value that is a second reference value. The electric dust collector 5 is intermittently operated based on the magnitude relationship. The control unit 10 measures the magnitude relationship between the current value measured by the current sensor 9 during intermittent operation and the first threshold current value, which is the second reference value, and is measured by the current sensor 9 during intermittent operation. Whether the electrostatic precipitator 5 can normally collect dust based on the magnitude relationship between the increase amount of the current value, which is the amount of change in the current value, and the first threshold current value increase amount, which is the first reference value. Determine whether or not. Thereby, in the case of overcurrent detection due to moisture absorption of the deposit, the air purifier 50 can automatically return to normal after the humidity is reduced by the retry operation, and can exhibit the air purifying function again without erroneously reporting the abnormality.

  In the above description, in order to determine whether or not the electric dust collector 5 has a short circuit failure, the current value flowing between the electrodes of the electric dust collector 5 is measured as an electrical characteristic value. The current value flowing between the electrodes of the electrostatic precipitator 5 is not limited. As the electrical characteristic value, a voltage value between the electrodes of the electrostatic precipitator 5 or a resistance value between the electrodes of the electrostatic precipitator 5 may be measured and used. Also in this case, in the same manner as described above, the relationship between the reference value of the electrical characteristic value and the electrical property value, and the relationship between the reference value of the change amount of the electrical property value and the change amount of the electrical property value. Based on the above, it is possible to determine whether the state occurring in the air purifier 50 is an overcurrent due to a short circuit failure or an overcurrent due to moisture absorption of the deposit, and immediately when it is determined that the electric dust collector 5 has a short circuit failure The user can be notified of the abnormality.

  In the above description, 10 minutes is shown as an example of the default time until the retry operation is performed in the stop mode in which the operation command from the remote controller 6 is stop, but the default time is not limited to a specific value.

  Moreover, although 10 minutes was shown as an example of the predetermined time until the retry operation is performed in the standby mode, it may be set according to the use environment and use conditions, and is not limited to a specific value.

  Further, different times may be set as the predetermined time until the retry operation in the stop mode is performed and the predetermined time until the retry operation in the standby mode is performed. For example, by shortening the predetermined time until the retry operation in the standby mode to 5 minutes, when the operation command from the remote controller 6 is the operation, the electrostatic precipitator 5 is temporarily stopped due to the moisture absorption of the adhering matter. It is also possible to make it possible to return as soon as possible from the state in which it is in effect. On the other hand, it is possible to reduce power consumption by increasing the predetermined time until the retry operation in the stop mode is performed, for example, 20 minutes.

  The predetermined time until the retry operation is periodically performed in the stop mode and the time until the retry operation is performed in the standby mode can be set at the time of product shipment, but the remote controller 6 or the main body of the air purifier 50 can be set. It may be set by operation.

  Further, when a volatile memory such as a RAM (Random Access Memory) of a microcontroller (Microcontroller) is used as the storage element 11, the memory is lost when the power of the air purifier 50 is shut off. For this reason, the process which sets the past detected electric current value to 0 mA in step S1 is performed. However, a non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) is also installed, and the latest current value is recorded in the non-volatile memory when the power of the air purifier 50 is shut off. Instead of setting the current value to 0 mA, the current value recorded in the nonvolatile memory may be read and set as the past detected current value. Based on the current value initially measured by the current sensor 9 after the air cleaner 5 is turned on and the current value stored in the nonvolatile memory when the air cleaner 5 is turned on, the control unit 10 You may calculate the increase amount of a value.

  The air cleaner 5 is energized at the time of shipment from the factory to confirm the operation. Even when the air cleaner 5 is operated for the first time in the market, the current value is recorded in the non-volatile memory, and the increase amount of the current value can be calculated.

  Furthermore, the current value information is written to the microcontroller ROM (Read Only Memory) at the time of shipment from the factory without the EEPROM for the purpose of preventing cost increase, and the past detected current value is set to 0 mA in step S1. Instead, the current value may be read from the ROM and set as the past detected current value.

  In addition, the remote controller 6 that has acquired the short-circuit failure state by communication blinks the lamp 8 to notify the abnormality, but the abnormality notification may be performed by displaying an error message or error code on the display unit of the remote controller 6. It is not limited to a specific method.

  As described above, in the air cleaner 50 according to the first embodiment, whether or not the state of the air cleaner 50 is an overcurrent due to a short circuit failure even if the humidity detection unit is not used and the humidity is in a high humidity state. It is possible to determine whether the current is an overcurrent due to moisture absorption of the kimono, and it is possible to promptly notify abnormality when a short circuit failure occurs. As a result, the failed part can be quickly replaced or repaired, so that the air cleaning function can be recovered early.

  In addition, when the air cleaner 50 detects an overcurrent due to moisture absorption of the deposit, the air cleaner 50 automatically recovers after the humidity is lowered by a retry operation, and can exhibit the air cleaning function again without erroneously reporting an abnormality.

  Moreover, since the air cleaner 50 does not need to be equipped with a humidity sensor, there are no demerits such as an increase in product cost, an increase in assembly man-hours, and an increase in product size due to the installation of the humidity sensor.

  Therefore, the air purifier 50 according to the first embodiment can notify the abnormality of the short circuit failure even in a high humidity state without using the humidity detection means, and it is an overcurrent due to the short circuit failure or an overcurrent due to moisture absorption of the deposit. It is possible to determine whether or not an abnormality is present, and it is possible to promptly notify an abnormality when a short-circuit failure occurs.

Embodiment 2. FIG.
FIG. 10 is a characteristic diagram showing an example of transition of the detected current value when the air cleaner according to the second embodiment of the present invention selects the standby mode based on the second threshold current value increase amount in the operation mode. is there. The air cleaner according to the second embodiment is the same as the air cleaner 50 according to the first embodiment in matters that are not particularly described, and the same functions and configurations as those of the air cleaner 50 according to the first embodiment. The same reference numerals are given and the description is omitted. In the air cleaner according to the second embodiment, the control unit 10 selects a control mode using a reference value of an increase amount of a different current value in each of the operation mode, the stop mode, and the standby mode. Is different from the first embodiment.

  In the air cleaner 50 according to the first embodiment described above, when the detection current value has a detection error that is a variation in detection accuracy and the increase amount of the current value is calculated at short intervals, the detection accuracy varies. As a result, there is a possibility that the detected current value becomes equal to or more than the first threshold current value increase amount that is the first reference value, although the short circuit failure is not occurred, and the abnormal mode is erroneously determined. In this case, the abnormal mode is erroneously determined by determining the control mode based on the second threshold current value increase amount obtained by correcting the first threshold current value increase amount with a correction value larger than the detection error of the detected current value. Can be prevented. An example of a short time interval for calculating the increase amount of the current value is 100 milliseconds.

  The second threshold current value increase amount is used to determine whether or not the electric dust collector 5 has a short circuit failure compared to the increase amount of the current value, which is the amount by which the current value measured by the current sensor 9 has changed. It is a threshold value. Then, the second threshold current value increase amount is compared with the change amount of the electrical characteristic value that is the change amount of the electrical characteristic value measured by the measurement unit, and whether or not the electric dust collector 5 has a short circuit failure. This is the third reference value for determining.

  In FIG. 10, the amount of increase in the current value when the state changes from the state below the first threshold current value, which is the second reference value, to the state above the first threshold current value in the operation mode is the first threshold value. It is located above the amount of increase in the current value and is larger than the amount of increase in the first threshold current value, which is 0.2 mA / 100 ms.

  The detection error of the detection current value is, for example, ± 0.1 mA. When the detected current value is equal to or greater than the first threshold current value, the increase amount of the current value is 0.2 mA / 100 ms, and therefore, the first threshold current value increase amount is determined as 250 mA / 10 minutes. That is, when the first threshold current value increase amount is determined as 0.04 mA / 100 ms, the current value increase amount is equal to or greater than the first threshold current value increase amount, and the control unit 10 causes a short circuit failure. It is determined that the error has occurred and the abnormal mode is selected.

  However, when viewed in a cycle of 1 second, the increase amount of the current value is only 0.01 mA / 100 msec, which is less than the first threshold current value increase amount, so it is determined that an overcurrent due to moisture absorption of the deposit has occurred. Thus, the standby mode should be selected. In order to prevent such erroneous determination, in the operation mode, a second threshold current value increase amount, for example, 0.5 mA / 100 msec, which is a third reference value in which the current value increase amount is larger than the detection error, is used. Thus, the control mode can be correctly selected by determining whether the overcurrent is detected due to a short circuit failure or the overcurrent is detected due to moisture absorption of the deposit, and selecting the control mode.

  In FIG. 10, the increase amount of the current value when the state is less than the first threshold current value during the operation mode is changed to a state equal to or higher than the first threshold current value is lower than the second threshold current value increase amount. Is smaller than the second threshold current value increase amount. Therefore, the control part 10 can determine that it is overcurrent detection by moisture absorption of a deposit | attachment, and can select standby mode.

  In addition, when the interval of retry operation is shortened for the purpose of shortening the time to return to the normal mode in standby mode, or when the interval of regular operation is increased for the purpose of reducing power consumption in stop mode, etc. When the measurement interval of the current value between the electrodes is different between the mode and the standby mode, a second threshold current value increase amount different from the first threshold current value increase amount is set, and an overcurrent due to a short circuit failure is set. The control mode may be selected by determining whether it is detection or overcurrent detection due to moisture absorption of the deposit.

  As described above, the first threshold value, which is the reference value for the increase amount of the current value, according to the difference in the interval for calculating the increase amount of the current value in each control mode, that is, the difference in the cycle for calculating the increase amount of the current value. By changing the amount of increase in the current value, the control mode can be selected without erroneous determination.

  FIG. 11: is a flowchart which shows the control flow of the control part 10 of the air cleaner concerning Embodiment 2 of this invention. The flowchart of FIG. 11 includes control for determining the next control mode using a reference value for the increase amount of the current value that differs depending on the current control mode.

  In step S11, the control unit 10 determines whether or not the detected current value is greater than or equal to the first threshold current value. If the detected current value is less than the first threshold current value, the result of step S11 is No, and the control unit 10 determines that the electric dust collector 5 can normally collect dust, and proceeds to step S12. If the detected current value is greater than or equal to the first threshold current value, the result of step S11 is Yes, and the control unit 10 determines that the electrostatic precipitator 5 cannot normally collect dust, and proceeds to step S32.

  In step S32, it is determined whether or not the current control mode is an operation mode. If the current control mode is the stop mode or the standby mode, No is returned in step S32, and the process proceeds to step S22. On the other hand, if the current control mode is the operation mode, Yes in step S32, and the process proceeds to step S33.

  In step S33, the control unit 10 determines whether or not the increase amount of the current value is equal to or greater than the second threshold current value increase amount that is the third reference value. If the increase amount of the current value is equal to or greater than the second threshold current value increase amount, Yes is determined in step S33, and the control unit 10 determines that an overcurrent is detected due to a short circuit failure, and proceeds to step S23 to set the control mode to the abnormal mode. Set to. On the other hand, if the increase amount of the current value is less than the second threshold current value increase amount, No is determined in step S33, and the control unit 10 determines that overcurrent is detected due to moisture absorption of the deposit, and proceeds to step S27 for control. Set the mode to standby mode.

  As described above, the air cleaner according to the second embodiment has the same effect as the air cleaner 50 according to the first embodiment.

  Moreover, in the air cleaner concerning this Embodiment 2, the control part 10 is the variation | change_quantity of the electrical property value which the current sensor 9 which is a measurement part which measures the electrical property value between the electrodes of the electrostatic precipitator 5 measured. There are a plurality of cycles for calculating the amount of change in the current value. And the control part 10 changes and uses the 1st threshold current value increase amount according to the period which calculates the variation | change_quantity of an electric current value, ie, uses the 2nd threshold current value increase amount. As a result, the air cleaner according to the second embodiment determines whether it is overcurrent detection due to a short circuit failure or overcurrent detection due to moisture absorption of the adhering matter, and determines the control mode. You can choose appropriately.

Embodiment 3 FIG.
FIG. 12 is a characteristic diagram illustrating an example of transition of the detected current value when the air cleaner according to the third embodiment of the present invention selects the abnormal mode based on the second threshold current value in the standby mode. The air cleaner according to the third embodiment is the same as the air cleaner according to the second embodiment in matters that are not particularly described, and the same functions and configurations as those of the air cleaner according to the second embodiment are the same. Reference numerals are assigned and description is omitted. The air cleaner according to the third embodiment is different from the second embodiment in that the control unit 10 provides the second threshold current value with respect to the detected current value. An example of the second threshold current value is 1000 mA.

  The second threshold current value is set to a current value that is larger than the first threshold current value and is not reached by normal moisture absorption. In other words, the second threshold current value has increased to a current value comparable to a short-circuit fault while keeping the increase in the current value less than the second threshold current value increase due to an unexpected situation. The current value that is sometimes reached. When the detected current value is equal to or greater than the second threshold current value, the control unit 10 determines that the electrostatic precipitator 5 is abnormal regardless of the amount of increase in the current value, and selects the abnormal mode. Therefore, the control unit 10 determines whether or not the air cleaner is abnormal depending on whether or not the detected current value is equal to or greater than the second threshold current value.

  The second threshold current value is a threshold value for determining whether or not the electric dust collector 5 has an abnormal short circuit failure as compared with the current value measured by the current sensor 9. The second threshold current value is a fourth reference value for determining whether or not the electric dust collector 5 has an abnormal short circuit failure as compared with the electrical characteristic value measured by the measurement unit.

  In FIG. 12, after the detected current value is equal to or higher than the second threshold current value that is the fourth reference value and the mode is shifted to the standby mode, the increase amount of the current value is the second threshold value that is the third reference value. It keeps increasing slowly while maintaining a state of less than the increase in current value. Then, when the detected current value is equal to or greater than the second threshold current value, the control unit 10 determines that an overcurrent is detected due to a short circuit failure and selects an abnormal mode.

  FIG. 13: is a flowchart which shows the control flow of the control part 10 of the air cleaner concerning Embodiment 3 of this invention. The flowchart in FIG. 13 has control for determining whether or not the air cleaner has a short circuit failure depending on whether or not the detected current value is equal to or greater than the second threshold current value.

  In step S22, the control unit 10 determines whether or not the increase amount of the current value measured by the current sensor 9, that is, the increase amount of the detected current value is equal to or greater than the first threshold current value increase amount that is the second reference value. judge. If the increase amount of the current value is equal to or greater than the first threshold current value increase amount, the determination in Step S22 is Yes, the control unit 10 determines that the overcurrent is detected due to the short circuit failure, and the process proceeds to Step S23. On the other hand, if the increase amount of the current value is less than the first threshold current value increase amount, No is determined in step S22, and the control unit 10 determines that the overcurrent is detected due to moisture absorption of the deposit, and proceeds to step S34.

  Further, in step S33, the control unit 10 determines whether or not the increase amount of the current value is equal to or greater than the second threshold current value increase amount that is the third reference value. If the increase amount of the current value is equal to or greater than the second threshold current value increase amount, Yes is determined in step S33, and the control unit 10 determines that an overcurrent is detected due to a short circuit failure, and proceeds to step S23 to set the control mode to the abnormal mode. Set to. On the other hand, if the increase amount of the current value is less than the second threshold current value increase amount, No is determined in step S33, and the control unit 10 determines that the overcurrent is detected due to moisture absorption of the attached matter, and proceeds to step S34.

  In step S34, the control unit 10 determines whether or not the detected current value is equal to or greater than a second threshold current value that is a fourth reference value. If the detected current value is less than the second threshold current value, No is determined in step S34, it is determined that overcurrent is detected due to moisture absorption by the attached matter, the process proceeds to step S27, and the standby mode is set. If the detected current value is equal to or greater than the second threshold current value, the result of step S34 is Yes, and the control unit 10 determines that the detected current value is a current value comparable to a short-circuit failure, and proceeds to step S23, in which the abnormal mode Set to.

  As described above, by using the second threshold current value, the controller 10 can safely protect the air purifier even when the amount of moisture absorbed by the deposit increases and an overcurrent comparable to a short-circuit failure flows. It is possible to stop and notify the user of the abnormality.

  As described above, the air cleaner according to the third embodiment has the same effect as the air cleaner 50 according to the first and second embodiments.

  Moreover, in the air cleaner concerning this Embodiment 3, the control part 10 is the detection which is the electrical property value which the current sensor 9 which is a measurement part which measures the electrical property value between the electrodes of the electrostatic precipitator 5 measured. It is determined whether or not the electric dust collector 5 has a short circuit failure based only on the magnitude relationship between the current value and the second threshold current value different from the first threshold current value. Thereby, the air cleaner concerning this Embodiment 3 can select abnormal mode, even when the overcurrent comparable to a short circuit failure flows by the unexpected situation. And if the air cleaner concerning this Embodiment 3 produces danger, since it can notify abnormality correctly and can perform replacement and repair of a failure part promptly, it can recover an air purifying function early. .

  Moreover, in the air cleaner concerning this Embodiment 3, when the control part 10 selects abnormality mode with the 2nd threshold current value, even if the method of notifying a user is the same as Embodiment 1. Alternatively, the blinking interval of the lamp 8 may be changed, the emission color of the lamp 8 may be changed, another lamp may be turned on or blinking, and the method is not limited to a specific method.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and the technologies of the embodiment can be combined with each other or can be combined with another known technology. However, part of the configuration may be omitted or changed without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 Fan, 1a Electric motor, 1b Impeller, 2 Supply port, 3 Exhaust port, 4 Air path, 5 Electric dust collector, 6 Remote controller, 7 Dust sensor, 8 Lamp, 9 Current sensor, 10 Control part, 11 Memory element, 12 treatment circuit, 50 air purifier.

Claims (7)

An electrostatic precipitator that charges the dust passing through the discharge space formed by applying a voltage between the electrodes, and that attracts the charged dust and collects electricity;
A measuring unit for measuring an electrical characteristic value between electrodes of the electrostatic precipitator;
A control unit for controlling the electric dust collector;
Have
The control unit may cause a short-circuit fault in the electrostatic precipitator based on a magnitude relationship between a change amount of the electrical characteristic value, which is an amount of change of the electrical characteristic value measured by the measurement unit, and a first reference value. To determine whether or not
An air purifier characterized by. When the control unit determines that the electric dust collector cannot normally collect dust based on the magnitude relationship between the electrical characteristic value measured by the measurement unit and the second reference value, Determining whether or not the electric dust collector has a short circuit failure based on the magnitude relationship between the change amount of the electrical characteristic value measured by the measurement unit and the first reference value;
The air cleaner according to claim 1. When the control unit determines that the electrostatic precipitator is not short-circuited, the control unit intermittently sets the electric precipitator based on the magnitude relationship between the electrical characteristic value measured by the measurement unit and the second reference value. Whether or not the electric dust collector can normally collect dust based on the magnitude relationship between the electrical characteristic value measured by the measurement unit and the second reference value during the intermittent operation. To determine whether
The air cleaner according to claim 2. A storage unit for storing the electrical characteristic value measured by the measurement unit;
The control unit is configured such that the electrical characteristic value first measured by the measurement unit after powering on the air cleaner and the electrical characteristic value stored in the storage unit when the air cleaner is powered on. And calculating a change amount of the electrical characteristic value based on
The air purifier according to any one of claims 1 to 3, wherein: The control unit has a plurality of cycles for calculating the amount of change in the electrical characteristic value measured by the measurement unit;
The air purifier according to any one of claims 1 to 4, wherein: The control unit includes a third reference in which the first reference value is changed in accordance with a change amount of the electrical characteristic value and a cycle for calculating the change amount of the electrical characteristic value measured by the measurement unit. Determining whether or not the electrostatic precipitator has a short circuit failure based on the magnitude relationship with the value;
The air cleaner according to claim 5. The control unit determines whether or not the electric dust collector has a short circuit failure based on a magnitude relationship between the electrical characteristic value measured by the measurement unit and a fourth reference value that is larger than the second reference value. To determine whether
The air cleaner according to claim 2.

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