JP2007147181A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner excelling in safety with configuration to stop power supply to an electric dust collector by an external protection device even when an internal protection device of the electric dust collector fails. <P>SOLUTION: This air conditioner is provided with the electric dust collector 2 and an AC/DC converter 16 for supplying power to the electric dust collector 2. The electric dust collector 2 includes: a high-voltage transformer unit 3a for charging suspended particles such as dust and pollen; a dust collection filter 4 for trapping the charged suspended particles; and the internal protection device for detecting an overcurrent of the high-voltage transformer unit 3a to stop the high-voltage transformer unit 3a. The air conditioner is provided with the external protection device for detecting an overcurrent on the output side of the AC/DC converter 16 to stop the power supply to the electric dust collector, and is structured to operate the internal protection device by giving it priority over the external protection device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner equipped with an electric dust collector.

  A conventional electrostatic precipitator is disclosed in Japanese Patent Laid-Open No. 10-15433 (Patent Document 1). This electrostatic precipitator detects the load current when a spark is generated between both electrodes, a dust collector including a discharge electrode and a dust collector, a power supply that applies a high voltage between both electrodes of the dust collector And a control unit that stops the application of the high voltage from the power source unit to the dust collecting unit.

Japanese Patent Laid-Open No. 10-15433

  However, Patent Document 1 does not disclose further safety measures when the control unit fails or when an electric dust collector is used for the air conditioner.

  An object of the present invention is to provide an air conditioner that is capable of stopping power supply to an electric dust collector by an external protection device even when the internal protection device of the electric dust collector fails, and that is more safe.

  Another object of the present invention is to provide an air conditioner that can further improve safety when the electric dust collector is applied to the air conditioner in addition to the above object.

  In order to achieve the above object, a first aspect of the present invention includes a high voltage transformer unit that charges floating particles such as dust and pollen, a dust collection filter that adsorbs charged floating particles, and the high voltage transformer. An air conditioner comprising: an electric dust collector having an internal protection device that detects an overcurrent of the unit and stopping the high voltage transformer unit; and an AC / DC converter that supplies electric power to the electric dust collector, An external protection device that detects an overcurrent on the output side of the AC / DC converter and stops power supply to the electrostatic precipitator is provided, and the internal protection device is operated with priority over the external protection device. That is.

In addition to the first aspect, another aspect for achieving the above-described another object is to configure as follows.
(1) The internal protection device includes an internal overcurrent detection circuit that stops input on the primary side of the high voltage transformer unit based on an overcurrent detected on the secondary side of the high voltage transformer unit, and the external protection An apparatus includes an overcurrent switch provided on an output side of the AC / DC converter to stop power supply to the electric dust collector, and an overcurrent detected based on an overcurrent detected on the output side of the AC / DC converter. An external overcurrent detection circuit that turns off the current switch is provided.
(2) An insulating AC / DC converter is used as the AC / DC converter, and a semiconductor switch such as a MOS-FET is used as the overcurrent switch.
(3) The external overcurrent detection circuit has a latch function for holding the OFF state of the overcurrent switch, and the external protection device has a latch release circuit for releasing the latch function of the external overcurrent detection circuit. Was it.
(4) A control device including a microcomputer or the like for controlling the air-conditioning operation is provided, and the control device operates the latch release circuit a plurality of times after the external overcurrent detection circuit turns on the overcurrent switch, and the AC A retry function is provided to check whether the overcurrent on the output side of the DC / DC converter has been eliminated.
(5) An insulated AC / DC converter is used as the AC / DC converter, and the control device uses the output of the AC / DC converter as a drive power source.
(6) An indoor unit including an indoor heat exchanger and an indoor fan is provided, and the indoor unit has the electric dust collector disposed on the suction side of the indoor heat exchanger, and a cover that covers the electric dust collector can be opened and closed. The external protection device includes a cover open / close detection switch connected in series with an overcurrent switch on the output side of the AC / DC converter, and the cover open / close detection switch is connected to the electric dust collector when the cover is opened. Turn off to stop power supply.
(7) The indoor unit is provided with a notification device, provided with voltage detection means on the output side of the cover open / close detection switch, and the control device is configured to detect the cover open / close detection switch based on the voltage state detected by the voltage detection means. A function of recognizing the open / closed state and notifying the recognition result by the notification device;
(8) The indoor unit is provided with a display unit, provided with voltage detection means on the output side of the cover open / close detection switch, and the control device detects the cover open / close detection switch based on the voltage state detected by the voltage detection means. A function of recognizing the open / closed state, determining whether or not cleaning is performed based on the recognition result when the accumulated energization time of the electric dust collector reaches a predetermined time, and displaying the determination result on the display unit;
(9) A control device including a microcomputer and a display unit are provided, and the control device detects the overcurrent when the internal overcurrent detection circuit detects no overcurrent, and the external overcurrent detection circuit detects the overcurrent, Provided with a function to display on the display unit when it is determined that an electric dust collector such as an internal overcurrent detection circuit or the high-voltage transformer unit has failed.

  According to the first aspect of the present invention, even when the internal protection device of the electrostatic precipitator fails, the power supply to the electrostatic precipitator can be stopped by the external protective device, thereby providing an air conditioner with higher safety. can do.

  The advantages of other aspects of the present invention will become apparent from the following description.

  Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  The air conditioner of the present embodiment is an indoor unit mainly composed of an AC / DC converter 16, an electric dust collector 2 having an internal protection device, an external protection device, a control device 8, a notification device, a heat exchanger, an indoor fan, and the like. It has. The air conditioner sucks indoor air into the indoor unit by operating the indoor fan, and performs an air cleaning operation for removing dust with the electric dust collector 2, an air conditioning operation for cooling, dehumidifying or heating with the heat exchanger.

  The AC / DC converter 16 is for converting AC power of the AC power source 12 into DC power and supplying power to the electrostatic precipitator 2 and the microcomputer 8. The AC / DC converter 16 is an insulating AC / DC converter including a commercial circuit 10, a control unit 11, and a switching transformer 13.

  As shown in FIGS. 1 and 2, the electric dust collector 2 includes a high-pressure unit 3 and a dust collection filter 4, and is detachably installed in the ventilation path on the suction side of the indoor heat exchanger of the indoor unit 20. ing. The indoor unit 20 is provided with a cover 21 that covers the electric dust collector 2 so as to be opened and closed. The cover 21 is partially opened during the air conditioning operation, so that the indoor air suction resistance can be reduced and an efficient operation can be performed.

  The high voltage unit 3 includes a high voltage transformer unit 3a that is a charging unit, and an internal overcurrent detection circuit 3b that constitutes an internal protection device. The high voltage transformer unit 3a is for boosting a direct current low voltage supplied from the AC / DC converter 16 to a high voltage to charge floating particles such as dust and pollen. The internal protective device is for detecting an abnormal state (specifically, overcurrent) of the high voltage transformer unit 3a and stopping the high voltage output of the high voltage transformer unit 3a. Specifically, the internal overcurrent detection circuit 3b stops the input on the primary side of the high voltage transformer unit 3a based on the overcurrent detected on the secondary side of the high voltage transformer unit 3a. When an abnormality is detected by the internal overcurrent detection circuit 3b, an abnormality signal is transmitted to the control device 8, an off signal is transmitted from the control device 8 to the electric dust collector 2, and the electric dust collector 2 is temporarily stopped. ing. At that time, the control device 8 controls the alarm device to perform various displays such as character display, lamp lighting, and voice. Thereby, the abnormality of the electrostatic precipitator 2 can be recognized.

  Further, since the overcurrent detection of the high voltage unit 3 may be a false detection, the internal overcurrent detection circuit 3b is provided with a latch function, and the latch function of the internal overcurrent detection circuit 3b is canceled by the latch release circuit. The number of times can be retried. Thus, in the case of erroneous detection, normal energization can be restored. In addition, when the arbitrary number of times is exceeded, the electrostatic precipitator 2 is completely stopped.

  The dust collection filter 4 is for adsorbing charged suspended particles by Coulomb force, and needs to be cleaned when used for a long time and adsorbs a large amount of suspended particles. In order to clean the dust collection filter 4, the cover 21 is opened and the dust collection filter 4 can be removed from the electric dust collector 2.

  The external protective device detects an abnormal state of the electrostatic precipitator 2 from the outside, specifically, detects an overcurrent on the output side of the detection AC / DC converter 16 and stops power supply to the electrostatic precipitator 2. It comprises a current detection resistor 15, an external overcurrent detection circuit 5, an overcurrent response switch 7, a latch release circuit 6, and a cover open / close detection switch 1.

  The overcurrent switch 7 is provided on the output side of the AC / DC converter 16 (external input side of the electrostatic precipitator 2), and stops the power supply to the electrostatic precipitator 2 when the electrostatic precipitator 2 is abnormal. A semiconductor switch such as a MOS-FET is used as the overcurrent switch 7. By using an insulated AC / DC converter as the AC / DC converter 16 and a semiconductor switch such as a MOS-FET as the overcurrent switch 7, an inexpensive external protection device with excellent reliability and controllability can be obtained. be able to.

  The current detection resistor 15 is provided on the input side of the electrostatic precipitator 2 on the output side of the AC / DC converter 16. The external overcurrent detection circuit 5 has a latch function for turning off the overcurrent switch based on the overcurrent detected by the current detection resistor 15 on the output side of the AC / DC converter 16 and holding the off state. ing. The latch release circuit 6 is provided so that the latch function of the external overcurrent detection circuit 5 can be released. The internal overcurrent detection circuit 3b constituting the internal protection device is configured to operate with priority over the external overcurrent detection circuit 5 constituting the external protection device.

  As described above, in addition to the internal protective device of the electrostatic precipitator 2, the external protective device is provided outside the electrostatic precipitator 2, so that even if the internal protective device of the electrostatic precipitator 2 fails, the external protective device The power supply to the dust collector 2 can be stopped, and an air conditioner with higher safety can be obtained. Since the internal protection device is configured to operate with priority over the external protection device, it is possible to easily cope with an abnormal state in which dust collecting filter 4 is likely to be clogged.

  The cover open / close detection switch 1 is provided in series with the overcurrent switch 7 on the output side of the AC / DC converter 16 and is turned off to stop the power supply to the electric dust collector 2 when the cover 21 is opened. is there. With this configuration, the dust collection filter 4 can be safely cleaned even when the cover 21 is opened.

  The control device 8 includes a microcomputer that controls the air conditioning operation. The control device 8 operates the latch release circuit 6 a plurality of times after the external overcurrent detection circuit 5 turns on the overcurrent corresponding switch 7, thereby causing the abnormal state of the electrostatic precipitator 2 (on the output side of the AC / DC converter 16). A retry function is provided to check whether the overcurrent has been resolved. With this configuration, it is possible to return to normal operation in the case of erroneous detection without using a dedicated control device for controlling the electric dust collector 2.

  Further, the control device 8 uses the output of the insulating AC / DC converter 16 as a drive power source. Specifically, drive power is obtained from a regulator 14 provided on the output side of the AC / DC converter 16. Since an insulated AC / DC converter is used as the AC / DC converter 16 and the output of the AC / DC converter 16 is used as a drive power source for the control device 8, the control device 8 can be driven with an inexpensive configuration.

  The notification device includes a display unit 9 connected to the control device 8, a lamp, voice notification means (speakers), and the like, and is installed on the front surface or bottom surface of the indoor unit 20. The display unit 9 has a liquid crystal display screen, and can display the upper part with illustrations, figures, characters, and the like.

  The control device 8 has a function of recognizing the open / closed state of the cover open / close detection switch 1 based on the voltage state detected by the voltage detection means 22 and notifying the recognition result by the notification device. With this configuration, when the cover 21 is opened, it can be notified that the dust collection filter 4 is cleaned carefully. The voltage detection means 22 is configured by wiring drawn out to the control device 8 from an intermediate portion of two resistors installed between the lines on the output side from the cover opening / closing switch 1.

  Further, the control device 8 recognizes the open / closed state of the cover open / close detection switch 1 based on the voltage state detected by the voltage detecting means 22, and when the accumulated energization time of the electrostatic precipitator 2 reaches a predetermined time, the recognition result. Is provided with a function of determining whether or not cleaning is performed and displaying the determination result on the display unit 9. By displaying the necessity of cleaning the dust collecting filter 4 of the electric dust collector 2 to the user, the electric dust collector 2 can be used in a safer state.

  Further, when the internal overcurrent detection circuit 3b does not detect the overcurrent and the external overcurrent detection circuit detects the overcurrent 5, the control device 8 can collect the electric dust collector such as the internal overcurrent detection circuit 3b and the high-voltage transformer unit 3a. The display unit 9 is provided with a function of determining that the failure is the failure of No. 2 and displaying the fact on the display unit 9. As a result, the electric dust collector 2 can be easily checked for a failure and repaired immediately, and safety can be improved from this point.

It is a block diagram of the air conditioner by one Embodiment of this invention. It is a block diagram of the electric dust collector in the air conditioner of FIG. It is a fragmentary perspective view of the indoor unit of the air conditioner of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cover opening / closing detection switch, 2 ... Electric dust collector, 3 ... High voltage unit, 3a ... High voltage transformer unit, 3b ... Internal overcurrent detection circuit, 4 ... Dust collection filter, 5 ... External overcurrent detection circuit, 6 ... Latch Release circuit, 7 ... Overcurrent detection switch when overcurrent is detected, 8 ... Control device, 9 ... Display unit, 10 ... Commercial circuit, 11 ... Control unit, 12 ... AC power supply, 13 ... Switching transformer, 14 ... Regulator, 15 DESCRIPTION OF SYMBOLS ... Current detection resistor, 16 ... AC / DC converter, 20 ... Indoor unit, 21 ... Cover, 22 ... Voltage detection means.

Claims (10)

A high voltage transformer unit that charges floating particles such as dust and pollen, a dust collection filter that adsorbs charged floating particles, and an internal that detects an overcurrent of the high voltage transformer unit and stops the high voltage transformer unit An electrostatic precipitator having a protective device;
An air conditioner comprising: an AC / DC converter that supplies power to the electric dust collector;
An external protection device for detecting an overcurrent on the output side of the AC / DC converter and stopping power supply to the electric dust collector;
The internal protection device is configured to operate in preference to the external protection device,
Air conditioner characterized by.   2. The air conditioner according to claim 1, wherein the internal protection device stops an input of a primary side of the high voltage transformer unit based on an overcurrent detected on a secondary side of the high voltage transformer unit. A current detection circuit, wherein the external protection device is provided on an output side of the AC / DC converter and detects an overcurrent corresponding switch for stopping power supply to the electric dust collector; and an output side of the AC / DC converter An air conditioner comprising: an external overcurrent detection circuit that turns off the overcurrent-capable switch based on the overcurrent.   The air conditioner according to claim 2, wherein an insulating AC / DC converter is used as the AC / DC converter, and a semiconductor switch such as a MOS-FET is used as the overcurrent switch. Air conditioner to do.   3. The air conditioner according to claim 2, wherein the external overcurrent detection circuit has a latch function for holding an off state of the overcurrent correspondence switch, and the external protection device is a latch of the external overcurrent detection circuit. An air conditioner comprising a latch release circuit for releasing the function.   5. The air conditioner according to claim 4, further comprising a control device including a microcomputer for controlling an air conditioning operation, wherein the control device releases the latch after the external overcurrent detection circuit turns on the overcurrent switch. An air conditioner comprising a retry function for operating a circuit a plurality of times to check whether an overcurrent on the output side of the AC / DC converter has been eliminated.   3. The air conditioner according to claim 2, wherein an insulation type AC / DC converter is used as the AC / DC converter, and the control device uses an output of the AC / DC converter as a driving power source. Air conditioner.   The air conditioner according to claim 2, further comprising an indoor unit including an indoor heat exchanger and an indoor fan, wherein the indoor unit has the electric dust collector disposed on a suction side of the indoor heat exchanger, and A cover that covers the electric dust collector is openable and closable, and the external protection device includes a cover open / close detection switch connected in series with an overcurrent switch on the output side of the AC / DC converter, and the cover open / close detection switch includes the cover An air conditioner that is turned off to stop power supply to the electric dust collector when opened.   8. The air conditioner according to claim 7, wherein the indoor unit is provided with a notification device, voltage detection means is provided on the output side of the cover open / close detection switch, and the control device is in a state of voltage detected by the voltage detection means. The air conditioner has a function of recognizing the open / closed state of the cover open / close detection switch based on the information and notifying the recognition result by the notification device.   8. The air conditioner according to claim 7, wherein the indoor unit is provided with a display unit, voltage detection means is provided on the output side of the cover open / close detection switch, and the control device is in a state of voltage detected by the voltage detection means. The open / close state of the cover open / close detection switch is recognized based on the determination result, and when the cumulative energization time to the electric dust collector reaches a predetermined time, the presence / absence of cleaning is determined based on the recognition result, and the determination result is displayed on the display unit. An air conditioner characterized by having a function of displaying on the screen. The air conditioner according to claim 2, further comprising: a control device including a microcomputer and a display unit, wherein the internal overcurrent detection circuit does not detect an overcurrent, and the external overcurrent detection circuit The air conditioner is provided with a function of determining that an electric precipitator such as the internal overcurrent detection circuit or the high-voltage transformer unit has failed and displaying on the display unit when an overcurrent is detected.

Images