US20090084127A1 - Air Conditioner - Google Patents

Air Conditioner Download PDF

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Publication number
US20090084127A1
US20090084127A1 US12/223,708 US22370807A US2009084127A1 US 20090084127 A1 US20090084127 A1 US 20090084127A1 US 22370807 A US22370807 A US 22370807A US 2009084127 A1 US2009084127 A1 US 2009084127A1
Authority
US
United States
Prior art keywords
drain
air conditioner
water
drain pump
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/223,708
Other languages
English (en)
Inventor
Haruo Nakata
Tomohiro Yabu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YABU, TOMOHIRO, NAKATA, HARUO
Publication of US20090084127A1 publication Critical patent/US20090084127A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F24F2013/227—Condensate pipe for drainage of condensate from the evaporator

Definitions

  • the present invention is related to an air conditioner, especially to an air conditioner that prevents drain piping from being clogged.
  • a drain method of force-feeding drain water with a drain pump is applied to some types of air conditioners that are provided at a high position such as air conditioners that are embedded in a ceiling or suspended from a ceiling.
  • a centrifugal pump is generally used as a drain pump that is used in an air conditioner of this type of drain method. In the centrifugal pump, the displacement is automatically changed by a water level of drain water in a drain water storing portion that is pumped up by the drain pump.
  • a trap may be provided to a drain piping that is arranged outside of the air conditioner to avoid a beam in a ceiling.
  • Patent Document 1 discloses such an air conditioner and a prior art of applied examples.
  • Patent Document 1 Pamphlet of International Publication No. 2004/053398
  • the drain water discharged by the drain pump contains large and small general foreign object, copper powder that is chip of a copper pipe of the piping, wasted tapes of sealing tapes that are used for a connecting portion of the piping, and waste textile that is generated from fibers such as clothes.
  • These foreign object is discharged with drain water when the flow rate of the drain water in the drain piping is fast, even if there is a portion where foreign object is likely to remain, for example, a trap in the drain piping.
  • the flow rate of the drain water in the drain piping is slow, the foreign object remains in the trap, for example, and this may cause clogging.
  • the diameter of the drain piping is large and such clogging has not been caused.
  • An objective of the present invention is to prevent clogging of a drain piping by controlling a drain pump in a drain water discharging method where drain water is force-fed by the drain pump.
  • One aspect of the present invention provides an air conditioner comprising a drain pan for collecting drain water that is dropped from a heat exchanger, a drain pump for discharging the drain water in the drain pan, and a DC motor for driving the drain pump.
  • the DC motor for driving the drain pump is controlled to increase its rotating speed when a rotary torque of the DC motor is increased.
  • start-stop control of the drain pump is executed according to a water level of the drain water in a drain water storing portion that is pumped up by the drain pump. According to this configuration, the drain pump is less frequently driven when the water amount discharged from the drain pump is small. This prevents clogging more effectively.
  • Another aspect of the present invention provides an air conditioner comprising a drain pan for collecting drain water that is dropped from a heat exchanger and a drain pump for discharging the drain water in the drain pan.
  • the drain pump is driven after a predetermined time has elapsed from the starting of the air conditioner. According to this configuration, immediately after the air conditioner is started and when the amount of the drain water in the drain water storing portion is small, the drain pump is not driven. This reduces opportunities of the clogging of the drain piping.
  • Another aspect of the present invention provides an air conditioner comprising a drain pan for collecting drain water that is dropped from a heat exchanger and a drain pump for discharging the drain water in the drain pan.
  • the drain pump is driven at a predetermined cycle by a timer while the air conditioner is driven.
  • the driving cycle of the drain pump is appropriately set such that the drain pump is driven when the water level in the drain water storing portion is high and the drain pump is not driven when the water level in the drain water storing portion is low. Accordingly, the foreign object remaining in the drain piping is flowed away before the clogging is caused.
  • FIG. 1 is a cross-sectional view showing an air conditioner according to a first embodiment of the present invention
  • FIG. 2 is a diagram for explaining a water level sensor in the air conditioner
  • FIG. 3 is a flowchart showing activation control of a drain pump in the air conditioner
  • FIG. 4 is a flowchart showing activation control of the drain pump in an air conditioner according to a second embodiment of the present invention.
  • FIG. 5 is a flowchart showing activation control of the drain pump in an air conditioner according to a third embodiment of the present invention.
  • FIGS. 1 to 3 An air conditioner according to a first embodiment of the present invention will now be explained with reference to FIGS. 1 to 3 .
  • the present invention is applied to an air conditioner that is embedded in a ceiling, which is one type of air conditioners that are arranged in high positions.
  • the air conditioner that is embedded in a ceiling according to the first embodiment is an indoor unit of an air conditioner of a separation type and includes a body 1 that accommodates various devices therein and a panel 2 that is arranged at a lower portion of the body 1 .
  • the body 1 is put above a ceiling 3 from an opening portion 3 a formed in the ceiling 3 of an air-conditioned room R to be attached to the ceiling 3 .
  • the panel 2 is fitted to the opening portion 3 a of the ceiling 3 and is closely attached to a surface of the ceiling that faces the air-conditioned room R.
  • a suction opening 2 a is formed at a center of the panel 2 so as to draw air from the air-conditioned room.
  • Outlets 2 b are formed at four portions in a peripheral portion that surrounds the suction opening 2 a . Air that is cooled or dehumidified is blown from the outlets 2 b.
  • the body 1 accommodates an air blower 4 and a heat exchanger 5 .
  • the air blower 4 draws air in the air-conditioned room into the body 1 via the suction opening 2 a formed at a center of the panel 2 and blows the drawn air toward its outer peripheral direction.
  • the heat exchanger 5 is arranged so as to surround the outer periphery of the air blower 4 .
  • a drain pan 6 is arranged at the lower portion of the heat exchanger 5 .
  • the drain pan 6 receives drain water that is generated in the heat exchanger 5 and drops therefrom.
  • a drain water storing portion 7 that stores drain water is formed at a portion of the drain pan 6 .
  • a drain pump 10 that pumps up drain water from the drain water storing portion 7 is provided to the drain pan 6 .
  • the heat exchanger 5 is drawn on a left side and a right side of the air blower 4 .
  • the heat exchanger 5 drawn on the left side and the right side of the air blower 4 is integrally formed.
  • the drain pan 6 is drawn on the left side and the right side of the air blower 4 in FIG. 1 .
  • the drain pan 6 drawn on the left side and the right side of the air blower 4 is integrally formed.
  • the drain pump 10 is a generally used centrifugal pump that automatically changes its displacement by the level of drain water in the drain water storing portion 7 .
  • the drain pump 10 has a body housing 12 , a DC motor 13 , a suction port 14 and a discharge port 15 .
  • the body housing 12 accommodates a rotational fan 11 therein.
  • the DC motor 13 drives the fan.
  • the suction port 14 is formed at the lower portion of the body housing 12 and the discharge port 15 discharges the drain water that is pumped up.
  • the drain pump 10 having such a configuration pumps up the drain water from the suction port 14 by centrifugal force that is generated by the rotation of the rotational fan 11 and discharges the drain water from the discharge port 15 .
  • a drain piping 16 that is communicated to the outside is connected to the discharge port 15 of the drain pump 10 .
  • the discharge amount of the drain pump 10 increases as the water level in the drain water storing portion 7 is higher, and the discharge amount from the drain pump 10 decreases as the water level in the drain water storing portion 7 is lower.
  • a water level sensor 20 is arranged in the drain water storing portion 7 .
  • the water level sensor 20 has a float 21 and a support cylinder 22 .
  • the float 21 is lifted or lowered according to the change of the water level of drain water.
  • the support cylinder 22 supports the float 21 .
  • a contact first point and a second contact point are provided in the support cylinder 22 of the water level sensor 20 .
  • the first contact point is activated when the float 21 is positioned at a lower water level A and the second contact point is activated when the float 21 is positioned at an upper water level B.
  • An activation signal from each contact point is transmitted to a controller 25 .
  • the lower water level A is set to a position where when the water level is lowered to the lower water level A or lower than the lower water level A, the discharge amount of the drain pump 10 reduces and the flow rate of the drain water in the drain piping 16 cannot be maintained to be a predetermined value or more.
  • the upper water level B is set to a position where if the drain pump 10 is not activated and maintained to be in a non-activated state, the drain water storing portion 7 becomes full.
  • the controller 25 controls the whole air conditioner and controls the activation of the drain pump 10 as shown by a flowchart in FIG. 3 according to input information from the water level sensor 20 .
  • the activation operation of the air conditioner and the activation operation of the drain pump 10 are explained with reference to FIG. 3 .
  • step S 1 When the water level in the drain water storing portion 7 reaches the upper water level B, the drain pump 10 is activated at a standard rotating speed (step S 2 ).
  • step S 3 it is determined whether the rotary torque of the DC motor 13 is a predetermined value or less (step S 3 ) and a determination for the remaining state of foreign object in the drain piping 16 is made according to the determination of step S 3 .
  • the rotary torque of the DC motor 13 is measured by an appropriate direct or indirect method.
  • the rotary torque of the DC motor 13 may be indirectly measured by the current value of the DC motor 13 .
  • the air conditioner is continuously activated. If it is determined that the water level in the drain water storing portion 7 is the lower water level A or lower (step S 6 ), the flow rate of the drain water in the drain piping 16 is reduced to the predetermined value or less and foreign object is likely to remain in the drain piping 16 . Therefore, the activation of the drain pump 10 is stopped (step S 7 ).
  • step S 3 If it is determined that the rotary torque of the DC motor 13 exceeds the predetermined value (step S 3 ), it should be considered that the rotary torque of the DC motor 13 has been increased due to the remaining foreign object of more than the predetermined amount in the drain piping 16 .
  • the discharge amount of the drain pump 10 is increased to increase the flow rate of the drain water in the drain piping 16 , the remaining foreign object is flowed away at once.
  • the drain pump 10 is activated for a predetermined period in a state that the rotating speed of the drain pump 10 is increased to the predetermined value (step S 4 ) and the rotating speed of the drain pump 10 is returned to the standard rotating speed after the predetermined period has elapsed (step S 5 ).
  • step S 6 if the water level of the drain water storing portion 7 is lowered to the predetermined value or lower (step S 6 ), the activation of the drain pump 10 is stopped as described above (step S 7 ). Thereafter, the control operation is executed by repeating the above procedure. Therefore, if it is determined that the rotary torque of the DC motor 13 is still large at the standard rotating speed after the rotating speed of the drain pump 10 is increased for a predetermined period, a control operation is executed such that the rotating speed of the drain pump 10 is increased again for a predetermined period.
  • the air conditioner of the present embodiment having the above configuration, if foreign object of the predetermined amount or more remains in the drain piping 16 , the rotating speed of the drain pump 10 is increased for a predetermined period to flow away the foreign object at once. Therefore, the clogging of the drain piping 16 is prevented.
  • the drain pump 10 is controlled to be started or stopped based on the water level of the drain water in the drain water storing portion 7 that is pumped up by the drain pump 10 . Therefore, when the water amount discharged from the drain pump 10 is small, the activation number of times of the drain pump 10 is reduced. This further suppresses the foreign object residue in the drain piping 16 .
  • the control of the drain pump 10 is different from the first embodiment.
  • the water level of the drain water in the drain water storing portion 7 is normally low. Therefore, when the drain pump 10 is activated at the starting of the operation of the air conditioner, the discharge amount of the drain pump 10 is small.
  • the foreign object that remains in the drain pan 6 is drawn by the drain pump 10 with the drain water and flowed to the drain piping 16 . As a result, the foreign object is likely to remain in the drain piping 16 . This control is thus not preferable.
  • the water level sensor 20 of the first embodiment is omitted and the same numerals or symbols are applied to the other parts and the explanation thereof is omitted.
  • the activation of the drain pump 10 is controlled according to the flowchart shown in FIG. 4 .
  • the activation control of the drain pump 10 is started.
  • a timer is reset (step S 11 ).
  • the drain pump 10 is activated (step S 13 ). Thereafter, the drain pump 10 is controlled by repeating this procedure.
  • the drain pump 10 when the air conditioner is started with a small amount of drain water in the drain water storing portion 7 , the drain pump 10 is not activated. Therefore, the drain piping 16 is unlikely to be clogged.
  • the control of the drain pump 10 is different from the first embodiment.
  • the drain pump 10 is activated at a predetermined cycle with using a timer to increase the discharge amount of the drain pump 10 .
  • the water level sensor 20 of the first embodiment is omitted and the same numerals or symbols are applied to the other parts and the explanation thereof is omitted.
  • the activation control is executed according to the flowchart shown in FIG. 5 .
  • the activation control of the drain pump 10 is started.
  • the timer is reset (step S 21 ).
  • the drain pump 10 is activated (step S 23 ). Further, it is determined whether the activation time of the drain pump 10 exceeds a predetermined time T 2 by the timer (step S 24 ).
  • step S 25 the control is executed by repeating this procedure such that the drain pump 10 is activated at a predetermined cycle.
  • the activation cycle of the drain pump 10 is appropriately set such that the drain pump 10 is activated when the water level in the drain water storing portion 7 is high, and the drain pump 10 is not activated when the water level in the drain water storing portion 7 is low.
  • the activation cycle of the drain pump 10 By setting the activation cycle of the drain pump 10 , the clogging of the drain piping 16 is suppressed.
  • the parts that contact the drain water such as the drain pan 6 , the drain pump 10 , and the drain piping 16 be formed by an antibacterial material such as a resin material containing an antibacterial agent or an antibacterial metal material such as a copper pipe. If such a material is used in the present invention, a synergistic effect of an antibacterial effect of the antibacterial agent and an effect that the foreign object remaining in the drain piping 16 is flowed away by increasing the flow rate in the drain pump 10 is obtained. The synergistic effect prevents the clogging of the drain piping 16 more effectively.
  • the present invention may be applied to an air conditioner that discharges drain water generated in a heat exchanger via a drain pump.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Air Conditioning Control Device (AREA)
US12/223,708 2006-03-10 2007-03-07 Air Conditioner Abandoned US20090084127A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006066087A JP2007240112A (ja) 2006-03-10 2006-03-10 空気調和機
JP2006-066087 2006-03-10
PCT/JP2007/054475 WO2007105571A1 (ja) 2006-03-10 2007-03-07 空気調和機

Publications (1)

Publication Number Publication Date
US20090084127A1 true US20090084127A1 (en) 2009-04-02

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Application Number Title Priority Date Filing Date
US12/223,708 Abandoned US20090084127A1 (en) 2006-03-10 2007-03-07 Air Conditioner

Country Status (7)

Country Link
US (1) US20090084127A1 (ja)
EP (1) EP1995526A4 (ja)
JP (1) JP2007240112A (ja)
KR (1) KR100986869B1 (ja)
CN (1) CN101384858B (ja)
AU (1) AU2007225863B2 (ja)
WO (1) WO2007105571A1 (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100000242A1 (en) * 2008-07-03 2010-01-07 New Widetech Industries Co., Ltd. Dehumidifier with multistage draining
US8946921B2 (en) 2011-04-12 2015-02-03 Plexaire, Llc Pressure powered impeller system and related method of use
US8961708B2 (en) 2012-11-13 2015-02-24 Plexaire, Llc Condensate management system and methods
US20180347851A1 (en) * 2015-06-23 2018-12-06 Samsung Electronics Co., Ltd. Drain hose and air conditioner including the same
CN109084462A (zh) * 2018-07-23 2018-12-25 珠海格力电器股份有限公司 一种排水装置、排水控制方法及装置
US10514196B2 (en) 2017-01-18 2019-12-24 Carrier Corporation Condensate drain pan port
US11231211B2 (en) * 2019-04-02 2022-01-25 Johnson Controls Technology Company Return air recycling system for an HVAC system
US11448422B2 (en) * 2018-08-03 2022-09-20 Sauermann Industrie Condensate lifting device comprising a movable condensate receiving tank, or mounted on a support movable in translation and/or rotation

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JP5568046B2 (ja) * 2011-03-30 2014-08-06 日立アプライアンス株式会社 空気調和機
JP5629706B2 (ja) * 2012-02-17 2014-11-26 リンナイ株式会社 ドレン排出装置
CN102954009A (zh) * 2012-11-22 2013-03-06 无锡惠山泵业有限公司 空调机排水泵
JP5542901B2 (ja) * 2012-11-22 2014-07-09 三菱電機株式会社 空気調和機
CN105371470B (zh) * 2015-10-09 2019-01-29 珠海格力电器股份有限公司 空调排水系统和方法
CN107120793B (zh) * 2017-05-05 2020-01-31 广东美的暖通设备有限公司 变频空调及其变频模块散热器防凝露控制方法
CN108168045A (zh) * 2017-12-06 2018-06-15 北京天诚同创电气有限公司 空调温度控制方法、装置及液体蓄冷空调系统
KR20210121850A (ko) 2020-03-31 2021-10-08 엘지전자 주식회사 히트펌프 및 그 동작방법
JP2021188875A (ja) * 2020-06-04 2021-12-13 パナソニックＩｐマネジメント株式会社 空気調和機
CN113899012A (zh) * 2020-07-06 2022-01-07 宁波奥克斯电气股份有限公司 一种排水装置、壁挂式空调器及其排水控制方法
CN112577170A (zh) * 2020-12-15 2021-03-30 佛山市顺德区美的电子科技有限公司 空调器水泵的控制方法、装置及空调器和存储介质
CN112902302A (zh) * 2021-03-15 2021-06-04 格力电器（郑州）有限公司 照明式空调内机
CN113531750B (zh) * 2021-06-28 2022-09-06 青岛海尔空调器有限总公司 用于控制水洗空调的方法及装置、水洗空调、存储介质
KR20240082540A (ko) * 2022-12-02 2024-06-11 엘지전자 주식회사 공기조화기
EP4394263A1 (en) * 2022-12-26 2024-07-03 LG Electronics Inc. Air conditioner

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100000242A1 (en) * 2008-07-03 2010-01-07 New Widetech Industries Co., Ltd. Dehumidifier with multistage draining
US7895849B2 (en) * 2008-07-03 2011-03-01 New Widetech Industries Co., Ltd. Dehumidifier with multistage draining
US8946921B2 (en) 2011-04-12 2015-02-03 Plexaire, Llc Pressure powered impeller system and related method of use
US8961708B2 (en) 2012-11-13 2015-02-24 Plexaire, Llc Condensate management system and methods
US20180347851A1 (en) * 2015-06-23 2018-12-06 Samsung Electronics Co., Ltd. Drain hose and air conditioner including the same
US11118809B2 (en) * 2015-06-23 2021-09-14 Samsung Electronics Co., Ltd. Drain hose and air conditioner including the same
US10514196B2 (en) 2017-01-18 2019-12-24 Carrier Corporation Condensate drain pan port
CN109084462A (zh) * 2018-07-23 2018-12-25 珠海格力电器股份有限公司 一种排水装置、排水控制方法及装置
US11448422B2 (en) * 2018-08-03 2022-09-20 Sauermann Industrie Condensate lifting device comprising a movable condensate receiving tank, or mounted on a support movable in translation and/or rotation
US11231211B2 (en) * 2019-04-02 2022-01-25 Johnson Controls Technology Company Return air recycling system for an HVAC system

Also Published As

Publication number Publication date
CN101384858B (zh) 2012-02-29
JP2007240112A (ja) 2007-09-20
KR20080096551A (ko) 2008-10-30
AU2007225863A1 (en) 2007-09-20
EP1995526A4 (en) 2013-10-30
CN101384858A (zh) 2009-03-11
KR100986869B1 (ko) 2010-10-08
EP1995526A1 (en) 2008-11-26
AU2007225863B2 (en) 2010-03-04
WO2007105571A1 (ja) 2007-09-20

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