JP2008144990A - Heat pump-type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably secure humidified quantity for a long period in a heat pump-type air conditioner. <P>SOLUTION: This heat pump-type air conditioner 60 is provided with a refrigerating cycle constituted by connecting a compressor 1, a four-way valve 2, an outdoor heat exchanger 6, an expansion valve 10 and an indoor heat exchanger 3 by refrigerant piping, and can execute a cooling operation and a heating/humidifying operation. This heat pump-type air conditioner 60 comprises a sub-expansion valve 10 disposed at an upstream side of a main expansion valve and reducing a pressure of a refrigerant from the indoor heat exchanger 3 in the heating/humidifying operation, a sub-outdoor heat exchanger 9 disposed at a downstream side of the sub-expansion valve and at an upstream side of the main expansion valve 5, and producing the condensate water by cooling the outside air by allowing the refrigerant from the sub-expansion valve 10 to flow in the heating/humidifying operation, a water receiving pan for storing the condensate water produced by the sub-outdoor heat exchanger 9, an electric heater dipped in the condensate water stored in the water receiving pan and evaporating the condensate water by directly heating the same, and a duct for guiding the vapor evaporated by the electric heater to an indoor unit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat pump air conditioner, and is particularly suitable for a heat pump air conditioner capable of heating and humidifying operation.

  In a heat pump type air conditioner that is often used in general homes, an indoor unit and an outdoor unit are configured separately, and the indoor unit includes an indoor heat exchanger for exchanging heat between indoor air and a refrigerant, An indoor fan that sends out air is installed, and in the outdoor unit, an outdoor heat exchanger for exchanging heat between the outside air and the refrigerant, a blower that ventilates the outside air, a compressor that circulates the refrigerant, and an expansion that decompresses the refrigerant Valves are installed. By connecting the refrigerant flow path between the indoor unit and the outdoor unit using a connection pipe, refrigerant flows back and forth between the indoor unit and the outdoor unit to establish a refrigeration cycle.

  In the heat pump type air conditioner having this configuration, the cooling operation and the heating operation are performed by changing the flow direction of the refrigerant by the four-way valve. Most current heat pump type air conditioners are controlled mainly by cooling operation and heating operation. However, most of the conventional heat pump type air conditioners are not capable of heating and humidifying operation.

  A conventional heat pump type air conditioner capable of heating and humidifying operation is disclosed in Japanese Patent Application Laid-Open No. 2001-99452 (Patent Document 1).

  This heat pump type air conditioner includes an indoor unit, an outdoor unit, and a humidifier. The indoor unit includes an indoor heat exchanger and an indoor fan. The outdoor unit includes a compressor, an expansion mechanism, an outdoor heat exchanger, an outdoor fan, and the like. The indoor unit and the outdoor unit are connected by a pair of communication pipes. A compressor, an expansion mechanism, and an outdoor heat exchanger are connected together with an indoor heat exchanger by a communication pipe or the like to constitute a refrigeration cycle. This refrigeration cycle is switched between a refrigeration cycle operation and a heat pump operation by a four-way valve. The humidifier is designed to adsorb moisture contained in the outside air to the zeolite, then heat the highly humidified zeolite with a heater to extract the moisture from the zeolite and generate humidified air. An air duct that guides the working air from the humidifying unit to the room is provided to humidify the room by sending the humidifying air into the room.

JP 2001-99452 A

  However, in the heat pump type air conditioner using the above-described zeolite, it is conceivable that the amount of moisture adsorption decreases due to time-series deterioration of the zeolite. In addition, when the outside air temperature is low (especially when the outside air temperature is negative) or the outside unit humidity is low, it is conceivable that the amount of moisture adsorbed by the zeolite is greatly reduced, and it is difficult to maintain a stable humidification amount. it is conceivable that.

  The objective of this invention is providing the heat pump type air conditioner which can ensure the humidification amount stably over a long period of time.

  In order to achieve the above-described object, the present invention provides an outdoor unit including a compressor, a four-way valve, a main outdoor heat exchanger, a main expansion valve, and a main outdoor fan, an indoor heat exchanger, and an indoor fan including an indoor fan. A compressor, the four-way valve, the main outdoor heat exchanger, the main expansion valve, and the indoor heat exchanger are connected by a refrigerant pipe to form a refrigeration cycle, and a cooling operation and a heating / humidifying operation are performed. In a possible heat pump air conditioner, a sub-expansion valve provided on the upstream side of the main expansion valve during heating and humidification operation as a part of the refrigeration cycle, and decompresses the refrigerant from the indoor heat exchanger, and the refrigeration As part of the cycle, it is provided downstream of the sub-expansion valve and upstream of the main expansion valve during heating and humidifying operation, and cools the outside air by flowing the refrigerant from the sub-expansion valve to generate condensed water With sub-outdoor heat exchanger A water tray for storing the condensed water generated by the sub-outdoor heat exchanger, an electric heater for directly heating and evaporating the condensed water by being immersed in the condensed water stored in the water tray, and a vapor evaporated by the electric heater And a duct for guiding the air to the indoor unit.

A more preferable specific configuration example in the present invention is as follows.
(1) A humidifying fan for forcibly sending steam in the duct to the indoor unit is provided, and the humidifying fan has a function of adjusting the air volume.
(2) A sub-outdoor unit including the sub-expansion valve, the sub-outdoor heat exchanger, the water tray, and the electric heater is configured.
(3) The sub outdoor unit is installed on the upper part of the main outdoor unit and integrated.
(4) A filter or an air cleaning device having an air cleaning function is installed on the windward side with respect to the air flow direction of the sub-outdoor heat exchanger.
(5) A function of automatically cleaning the filter or the air purifier after a certain period of time or by receiving a specific signal is provided.

  According to the heat pump type air conditioner of the present invention, the humidification amount can be stably secured over a long period of time.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In addition, this invention includes making it more effective by combining each embodiment suitably.
(First embodiment)
A heat pump type air conditioner according to a first embodiment of the present invention will be described with reference to FIGS.

  The entire heat pump type air conditioner 60 of the present embodiment will be described with reference to FIG. FIG. 1 is a configuration diagram of a heat pump type air conditioner 60 according to the first embodiment of the present invention.

  The heat pump type air conditioner 60 includes an outdoor unit 30, an indoor unit 40, a sub outdoor unit 50, and a connecting device that connects them, and can perform a cooling operation and a heating operation. The heating operation includes heating single operation and heating humidification operation. Here, the heating / humidifying operation is an operation for humidifying the room during heating. Each of these operation modes can be set by operating a remote controller (not shown). Further, the connection device includes a refrigerant pipe that communicates each of the devices 30, 40, 50, electric wiring, signal wiring, and a duct that connects the sub outdoor unit 50 and the indoor unit 40.

  The remote control is provided with an individual operation setting button capable of individually setting each operation mode of cooling operation, heating single operation and heating / humidification operation, and an automatic operation setting button capable of automatically selecting these operation modes. When the automatic operation setting button is operated, each operation mode is automatically selected based on the detection result of a sensor that detects the indoor temperature, humidity, and the like. In addition, the humidification button which humidifies at the time of heating operation may be provided, and heating / humidification operation may be performed by operating a humidification button in the state which set heating operation mode.

  The outdoor unit 30 is disposed outside and includes a compressor 1, a four-way valve 2, a main outdoor heat exchanger 6, a main expansion valve 5, and a main outdoor fan 7 that vents outdoor air, which is outdoor air, to the outdoor heat exchanger 6. Configured.

  The indoor unit 40 is disposed on an upper wall surface of the room and the like, and includes an indoor heat exchanger 3 and an indoor fan 4 for passing indoor air through the indoor heat exchanger 3. The indoor heat exchanger 3 may be divided into two, and a dehumidifying decompressor may be provided so that a known dehumidifying operation can be performed.

  The sub-outdoor unit 50 includes the sub-expansion valve 10 and the sub-outdoor heat exchanger 9 in the sub-outdoor casing 51, and is arranged side by side with the outdoor unit 30 in the vertical and horizontal directions or apart from the outdoor unit 30. Arranged outdoors. The sub outdoor heat exchanger 9 constitutes an outdoor heat exchanger together with the main outdoor heat exchanger 6, and is composed of a plate fin and a refrigerant pipe.

  The refrigeration cycle is configured by connecting the compressor 1, the four-way valve 2, the main outdoor heat exchanger 6, the main expansion valve 5, the sub outdoor heat exchanger 9, the sub expansion valve 10, and the indoor heat exchanger 3 with refrigerant piping. ing. In this refrigeration cycle, the compressor 1, the four-way valve 2, the main outdoor heat exchanger 6, the main expansion valve 5, the auxiliary outdoor heat exchanger 9, and the auxiliary expansion valve 10 are operated by operating the four-way valve 2 as indicated by a solid line. A cooling cycle in which refrigerant is circulated in the order of the indoor heat exchanger 3, the four-way valve 2, and the compressor 1 is configured. Further, by operating the four-way valve 2 as indicated by a dotted line, the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the sub expansion valve 10, the sub outdoor heat exchanger 9, the main expansion valve 5, and the main outdoor heat A heating cycle in which refrigerant is circulated in the order of the exchanger 6, the four-way valve 2, and the compressor 1 is configured.

  During the cooling operation, the main expansion valve 5 is fully opened, the sub-expansion valve 10 is in the throttle state, and the four-way valve 2 is in the solid line state. During this cooling operation, the refrigerant is compressed by the compressor 1, passes through the four-way valve 2, dissipates heat to the outside air in the main outdoor heat exchanger 6, condenses, passes through the fully opened main expansion valve 5, and exchanges the sub-outdoor heat. The heat is further radiated and condensed to the outside air in the vessel 9, throttled and depressurized by the sub-expansion valve 10, absorbed from the indoor air by the indoor heat exchanger 3, evaporated, passed through the four-way valve 2, and returned to the compressor 1. . The cooling of the room is performed by continuing the circulation of the refrigerant.

  At the time of heating independent operation, it operates by the heating cycle which made the main expansion valve 5 into a full open state, made the sub-expansion valve 10 into a throttling state, and made the four-way valve 2 into a dotted line state. In this heating single operation, the refrigerant is compressed by the compressor 1, passes through the four-way valve 2, dissipates heat to the indoor air by the indoor heat exchanger 3, is condensed by the sub-expansion valve 10, and is depressurized. The heat exchanger 9 absorbs heat from the outside air and evaporates, passes through the fully opened main expansion valve 5, further dissipates heat to the outside air in the main outdoor heat exchanger 6, evaporates, passes through the four-way valve 2, and is returned to the compressor 1. . By continuing the circulation of the refrigerant, indoor heating without humidification is performed.

  During the heating / humidifying operation, both the main expansion valve 5 and the sub-expansion valve 10 are in the throttled state and the four-way valve 2 is operated in the heating cycle. In this heating / humidifying operation, the refrigerant is compressed by the compressor 1, passes through the four-way valve 2, is radiated and condensed to the indoor air by the indoor heat exchanger 3, is throttled and depressurized by the sub-expansion valve 10, The heat exchanger 9 absorbs heat from the outside air and evaporates, the main expansion valve 5 further throttles and depressurizes, the main outdoor heat exchanger 6 further absorbs heat from the outside air and evaporates, passes through the four-way valve 2, and the compressor 1. Returned to By continuing the circulation of the refrigerant, condensed water is generated on the surface of the sub-outdoor heat exchanger 9, and the indoor heating with humidification is performed using the condensed water. Thus, by generating condensed water by the sub-outdoor heat exchanger 9 provided in the refrigeration cycle, the humidification amount can be stably secured over a long period of time. That is, the sub-expansion valve 10 can be throttled to depressurize the refrigerant in the pipe, and moisture necessary for humidification can be condensed in the sub-outdoor heat exchanger 9. Further, by adjusting the amount of squeezing, it is possible to secure a stable moisture amount even in time series.

  Next, humidification using the condensed water generated in the sub-outdoor heat exchanger 9 during the heating / humidifying operation will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view of the sub outdoor unit 50 of FIG.

  The sub-outdoor unit 50 constitutes a humidifier, and includes a sub-outdoor heat exchanger 9 that condenses outside air to generate condensed water, and a water tray 11 that stores the condensed water generated in the sub-outdoor heat exchanger 9. The electric heater 12 which is a heating means for heating and evaporating the condensed water stored in the water tray 11, the duct 13 for guiding the vapor evaporated by the electric heater 12 to the indoor unit 40, and the steam in the duct 13 being indoors The humidifying fan 14 is forcibly sent to the machine 40.

  The sub-outdoor heat exchanger 9 is installed on the downstream side of the sub-expansion valve 10 and the upstream side of the main expansion valve 5 during the heating / humidifying operation, and the refrigerant decompressed by the sub-expansion valve 10 flows to cool the outside air. To produce condensed water. Here, the throttle amount of the sub expansion valve 10 is controlled by a control device (not shown) based on the outside air temperature and the outside air humidity so that a necessary amount of condensed water can be generated from the outside air. In addition, the throttle amounts of the main expansion valve 5 and the sub expansion valve 10 can generate condensed water while suppressing frost formation on the sub outdoor heat exchanger 9 even when the outside air has a negative temperature. Controlled.

  The water tray 11 is disposed below the sub-outdoor heat exchanger 9 so as to receive the condensed water dripping from the sub-outdoor heat exchanger 9, and a predetermined amount of this condensate is stored to ensure a necessary amount of humidification. It has a possible depth. The water tray 11 is formed wider than the sub-outdoor heat exchanger 9, and a portion located outside the sub-outdoor heat exchanger 9 is used as a steam generation unit 11a.

  The electric heater 12 heats and evaporates the condensed water stored in the water tray 11, and is installed in the steam generation part 11a so that the condensed water can be directly heated. Thereby, condensed water can be heated efficiently.

  The duct 13 is formed in a cylindrical shape and is installed on the upper part of the steam generation unit 11a. The lower end portion of the wall surface 13 a on the auxiliary heat exchanger side of the duct 13 is formed to extend to the vicinity of the bottom surface of the water tray 11. Thereby, the condensed water in the steam generation part 11a can be efficiently heated to the steam by the electric heater 12. An outside air intake 15 is provided at a position close to the surface of the condensed water stored at the lower part of the wall surface 13 b on the side opposite to the auxiliary heat exchanger of the duct 13. This outside air intake 15 may be provided on the side surface of the dew tray 11. A duct that connects the sub outdoor unit 50 and the indoor unit 40 is connected to the upper end opening of the duct 13.

  The humidifying fan 14 takes in outside air from the outside air intake port 15 and sends it to the indoor unit 40 together with the steam evaporated in the steam generating part 11 a, and is installed in the upper part of the duct 13. By providing the outside air intake 15, when the steam is sent indoors by the humidifying fan 14, the steam can be smoothly sent to the indoor space.

  When the temperature of the outdoor air becomes low (that is, when the outdoor air becomes a negative temperature), the sub outdoor heat exchanger 9 may be frosted and it may be difficult to take in moisture. In that case, in the water replenishment method according to the present embodiment, the sub-expansion valve 10 controls the refrigeration cycle to cause the sub-outdoor heat exchanger 9 to form frost, and although not shown, the temperature sensor or the like detects the degree of frost formation, By changing from the control by the valve 10 to the control by the main expansion valve 5, the sub-outdoor heat exchanger 9 which has been used as an auxiliary heat exchanger of the main outdoor heat exchanger 6 as an evaporator until then acts as a condenser The refrigerant having a certain high temperature can be sent into the sub-outdoor heat exchanger 9, and the frost formed can be melted and sent to the dew tray 11 as moisture. Therefore, it is possible to perform a humidifying operation even when the temperature of the outdoor air is negative.

  On the other hand, by operating the sub outdoor heat exchanger 9 by the above-described method, the sub outdoor heat exchanger 9 that was part of the refrigerant pipe at the time of normal heating operation can be used as an auxiliary to the main outdoor heat exchanger 6. Since the role can be made, the heating performance can be improved.

According to this embodiment, it can be set as the heat pump type air conditioner which can humidify only by adding the sub outdoor unit 50 for humidification to the conventional heat pump type air conditioner. Further, also in normal heating single operation and cooling operation, the sub outdoor unit 50 plays an auxiliary role of the outdoor heat exchanger 6, and thus it is possible to improve the heating performance or the cooling performance.
(Second to sixth embodiments)
Next, second to sixth embodiments of the present invention will be described with reference to FIGS. The second to sixth embodiments are different from the embodiment to be compared in the following points, and are basically the same as the embodiment to be compared in the other points, so that the duplicate description is omitted. To do.

  FIG. 3 is a schematic cross-sectional view of the sub outdoor unit 50 according to the second embodiment of the present invention. This 2nd Embodiment forms deeply only the condensed water production | generation part 11a of the water tray 11 compared with 1st Embodiment. Thereby, the quantity of the condensed water of the condensed water production | generation part 11a can be ensured, and reliable humidification can be performed.

  FIG. 4 is a schematic cross-sectional view of the sub outdoor unit 50 according to the third embodiment of the present invention. In the third embodiment, as compared with the second embodiment, the entire bottom surface of the water tray 11 is formed so as to gradually become deeper as it goes to the condensed water generator 11a. Thereby, condensed water can be smoothly guide | induced to the condensed water production | generation part 11a.

  FIG. 5 is a configuration diagram of a heat pump type air conditioner 60 according to a fourth embodiment of the present invention. In the fourth embodiment, as compared with the second embodiment, a sub-outdoor fan 16 that forcibly sends air from outside air to the sub-outdoor heat exchanger 9 installed in the sub-outdoor unit 50 is installed. is there. In 1st Embodiment, the quantity of the water | moisture content which can be taken may not be stabilized by the installation place of the sub outdoor unit 50, the shape of the sub outdoor unit 50, etc. By forcedly sending outside air as in the second embodiment, outside air can be taken in effectively, and the amount of humidification can be stably increased. Then, a humidifying fan 14 for forcibly circulating outdoor air is installed inside the sub outdoor unit 50, and the amount of water from the outside air is adjusted by adjusting the throttle amount of the sub expansion valve 10 and the air volume of the sub outdoor fan 16. The removal amount can be controlled, and there is no need to change the configuration of the sub outdoor unit 50 due to the difference in the required humidification amount due to the difference in the size of the room. In addition, the sub-outdoor fan 16 can be operated efficiently by performing control that correlates the rotation speed of the sub-outdoor fan 16 with respect to the outside air temperature or the temperature of the sub-outdoor heat exchanger 9.

  FIG. 6 is a perspective view for explaining an installation state of the outdoor unit 30 and the sub outdoor unit 50 in the fifth embodiment of the present invention.

  In the fifth embodiment, the sub outdoor unit 50 is installed on the upper part of the main outdoor unit 30, and the sub outdoor unit 50 and the main outdoor unit 30 are integrated to form the outdoor unit 30 and the sub outdoor unit 50 as a whole. Compactness can be achieved. Moreover, since the sub outdoor unit 50 can be incorporated in the outdoor unit 30 at the production stage of the factory, it is possible to eliminate the troublesomeness at the time of installation.

  In addition, since the sub outdoor unit 50 is incorporated into the main outdoor unit 30, the connection pipe connecting the sub outdoor unit 50 and the main outdoor unit 30 can be connected at the factory production stage, and refrigerant leakage can be checked during the production process. It is possible to reduce the refrigerant leakage failure during installation.

  Further, when the sub-outdoor heat exchanger 9 is operated as an auxiliary heat exchanger for the main outdoor heat exchanger 6, the connection pipe between the main outdoor heat exchanger 6 and the sub-outdoor heat exchanger 9 is shortened as much as possible. Since the pressure loss between the heat exchangers can be reduced, the sub-outdoor heat exchanger 9 can be used effectively during cooling operation or heating operation, leading to improved performance.

  FIG. 7 is a schematic cross-sectional view of the sub outdoor unit 50 according to the sixth embodiment of the present invention.

  In a heat pump type air conditioner used in a general household, when an outdoor unit after use is seen, dust, dust, and the like are attached, and in particular, dust is often accumulated on the surface of the outdoor heat exchanger. Therefore, in the sixth embodiment, the filter 18 and / or the air cleaning device 19 having an air cleaning function are installed on the windward side with respect to the air flow direction of the sub-outdoor heat exchanger 9. By setting it as this structure, the air from which dust and dust were substantially removed can be sent to the sub outdoor heat exchanger 9, and the fall of the water collecting performance of the sub outdoor heat exchanger 9 can be suppressed. In addition, by keeping the air sent to the sub-outdoor heat exchanger 9 in a clean state, the water captured there can be kept clean, and by heating the water with the electric heater 12, Can be humidified.

  In the sixth embodiment, it can be considered that dust and dust adhere to the filter 18 and the air cleaning device 19. If the filter 18 or the air cleaning device 19 is clogged with dust or dust, the amount of air sent to the sub-outdoor heat exchanger 9 is reduced, and more energy is required than the initial installation to secure the necessary moisture. It becomes. Therefore, the filter 18 or the air cleaning device 19 is automatically cleaned after a certain period of time, or when a specific signal is received or turned on, thereby eliminating clogging caused by dust and dust in the filter 18 and the air cleaning device 19 and wasting. It is desirable to eliminate the use of energy.

It is a block diagram of the heat pump type air conditioner of 1st Embodiment of this invention. It is the cross-sectional schematic of the sub outdoor unit in FIG. It is a section schematic diagram of a sub outdoor unit in a 2nd embodiment of the present invention. It is a section schematic diagram of a sub outdoor unit in a 3rd embodiment of the present invention. It is a block diagram of the heat pump type air conditioner of 4th Embodiment of this invention. It is a perspective view explaining the installation state of the outdoor unit and sub outdoor unit in 5th Embodiment of this invention. It is a section schematic diagram of a sub outdoor unit in a 6th embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Four way valve, 3 ... Indoor heat exchanger, 4 ... Indoor fan, 5 ... Expansion valve, 6 ... Outdoor heat exchanger, 7 ... Outdoor fan, 9 ... Sub outdoor heat exchanger, 10 ... Sub Expansion valve, 11 ... Water tray, 11a ... Steam generating unit, 12 ... Electric heater, 13 ... Duct, 13a, 13b ... Wall surface, 14 ... Humidification fan, 15 ... Outside air intake, 16 ... Sub-outdoor fan, 18 ... Filter , 19 ... Air purifier, 30 ... Outdoor unit, 40 ... Indoor unit, 50 ... Sub-outdoor unit, 51 ... Sub-outdoor casing, 60 ... Heat pump air conditioner.

Claims (6)

A compressor, a four-way valve, a main outdoor heat exchanger, a main expansion valve, an outdoor unit having a main outdoor fan, an indoor heat exchanger, an indoor unit having an indoor fan, the compressor, the four-way valve, In the heat pump type air conditioner capable of performing a cooling operation and a heating / humidifying operation by configuring the refrigeration cycle by connecting the main outdoor heat exchanger, the main expansion valve and the indoor heat exchanger with refrigerant piping,
A sub-expansion valve that is provided upstream of the main expansion valve during heating and humidification operation as part of the refrigeration cycle, and depressurizes the refrigerant from the indoor heat exchanger;
Condensed water is provided on the downstream side of the sub-expansion valve and the upstream side of the main expansion valve during heating / humidifying operation as part of the refrigeration cycle, and cools the outside air by flowing the refrigerant from the sub-expansion valve. A sub-outdoor heat exchanger that produces
A water tray for collecting condensed water generated in the sub-outdoor heat exchanger;
An electric heater that evaporates by directly heating the condensed water by dipping in the condensed water stored in the water tray;
A heat pump type air conditioner comprising a duct for guiding the vapor evaporated by the electric heater to the indoor unit.   2. The heat pump air conditioner according to claim 1, further comprising a humidifying fan for forcibly sending the steam in the duct to the indoor unit, wherein the humidifying fan has a function of adjusting an air volume.   The heat pump air conditioner according to claim 1, wherein a sub outdoor unit including the sub expansion valve, the sub outdoor heat exchanger, the water tray, and the electric heater is configured.   4. The heat pump air conditioner according to claim 3, wherein the sub outdoor unit is installed on and integrated with an upper part of the main outdoor unit.   4. The heat pump air conditioner according to claim 3, wherein a filter or an air purifier having an air cleaning function is installed on the windward side with respect to the air flow direction of the sub-outdoor heat exchanger.   6. The heat pump air conditioner according to claim 5, further comprising a function of automatically cleaning the filter or the air purifier after a certain period of time or by receiving a specific signal.

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