JP2017015292A - Air conditioning device - Google Patents

Air conditioning device Download PDF

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JP2017015292A
JP2017015292A JP2015130706A JP2015130706A JP2017015292A JP 2017015292 A JP2017015292 A JP 2017015292A JP 2015130706 A JP2015130706 A JP 2015130706A JP 2015130706 A JP2015130706 A JP 2015130706A JP 2017015292 A JP2017015292 A JP 2017015292A
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drain
drain pump
pump
heat exchanger
air conditioner
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JP6579826B2 (en
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哲 牟藤
Satoru Muto
哲 牟藤
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Mitsubishi Electric Building Solutions Corp
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Mitsubishi Electric Building Techno Service Co Ltd
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  • 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)

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device that can effectively clean a drain discharge system, for example, by removing attached slime from a drain pump without disassembling the drain pump.SOLUTION: An air conditioning device comprises: a drain pan for storing drain water generated in a heat exchanger; a drain pump 24 for discharging the drain water stored in the drain pan; and a control unit 40 for controlling operation of the drain pump 24. The control unit 40 can execute cleaning operation for operating the drain pump 24 in a direction opposite to a discharge direction.SELECTED DRAWING: Figure 4

Description

本発明は、熱交換器で発生したドレン水を排水配管を介して外部に排出する空気調和装置、特にドレンポンプを用いてドレン水を外部に排出する空気調和装置に関する。   The present invention relates to an air conditioner that discharges drain water generated in a heat exchanger to the outside through a drain pipe, and more particularly to an air conditioner that discharges drain water to the outside using a drain pump.

空気調和装置の運転時には、熱交換器から多量の結露水が発生し、この結露水を一時的に貯留するために熱交換器の直下にはドレンパンが設けられている。ドレンパンに貯留された結露水には、空気中に浮遊していた塵埃等が多量に含まれるため、雑菌が繁殖して粘性状のスライムが発生するが、このスライムがドレンポンプの羽根や排水配管に付着すると故障や排水不良の原因になる。   During operation of the air conditioner, a large amount of condensed water is generated from the heat exchanger, and a drain pan is provided directly below the heat exchanger in order to temporarily store the condensed water. Condensation water stored in the drain pan contains a large amount of dust that has floated in the air, so that germs grow and viscous slime is generated. If it adheres to it, it may cause failure or poor drainage.

例えば、特許文献1には、ドレンポンプに接続された排水配管と、この排水配管から分岐してドレンパンに戻る第2排水配管と、第2排水配管の直下に設けられた汚れ捕集手段とを有し、ドレンポンプの運転停止時に上流側の排水配管内に残っている水が第2排水配管を経由してドレンパンへ戻されることで汚れ捕集手段によって水が濾過されてスライムの発生を抑制できるようにした空気調和装置が開示されている。   For example, Patent Document 1 includes a drainage pipe connected to a drain pump, a second drainage pipe branched from the drainage pipe and returning to the drain pan, and a dirt collecting means provided directly below the second drainage pipe. And when the drain pump is stopped, the water remaining in the upstream drainage pipe is returned to the drain pan via the second drainage pipe, so that the water is filtered by the dirt collecting means and the generation of slime is suppressed. An air conditioner that can be used is disclosed.

特開2013−253711号公報JP2013-253711A

しかしながら、上記特許文献1に開示された空気調和装置では、ドレンポンプの羽根等にスライムが付着して動かなくなるとドレンポンプを分解して清掃する必要がありメンテナンスに手間がかかるという問題がある。   However, the air conditioner disclosed in Patent Document 1 has a problem that if the slime adheres to the drain pump blades and the like and does not move, the drain pump needs to be disassembled and cleaned, and maintenance is troublesome.

本発明の目的は、ドレンポンプを分解することなく付着したスライムをドレンポンプから取り除く等ドレン排出系を効果的に清掃することができる空気調和装置を提供することにある。   It is an object of the present invention to provide an air conditioner that can effectively clean a drain discharge system such as removing slime adhering from a drain pump without disassembling the drain pump.

本発明に係る空気調和装置は、熱交換器で発生したドレン水を貯留するドレンパンと、ドレンパンに貯留されたドレン水を排出するドレンポンプと、ドレンポンプの運転を制御する制御部とを有する空気調和装置であって、制御部は、ドレンポンプを排出と反対方向に運転する清掃運転を実行可能である。   An air conditioner according to the present invention includes a drain pan that stores drain water generated in a heat exchanger, a drain pump that drains drain water stored in the drain pan, and a control unit that controls the operation of the drain pump. It is a harmony device, Comprising: The control part can perform the cleaning driving | operation which drives a drain pump in the opposite direction to discharge | emission.

本発明に係る空気調和装置において、清掃運転を行うための手動切替スイッチをさらに備えることが好適である。   In the air conditioner according to the present invention, it is preferable to further include a manual changeover switch for performing a cleaning operation.

本発明に係る空気調和装置によれば、保守時にドレンポンプを排出と反対方向に回転させることによってドレンポンプ内に溜まったスライム等の異物を取り除くことができる。その結果、ドレンポンプを分解洗浄する手間を要することなくスライムをドレンポンプから取り除くことができる等ドレン排出系を効果的に清掃することができる。



According to the air conditioner according to the present invention, foreign matters such as slime accumulated in the drain pump can be removed by rotating the drain pump in the direction opposite to the discharge during maintenance. As a result, the drain discharge system can be effectively cleaned such that slime can be removed from the drain pump without the need for disassembling and cleaning the drain pump.



本発明に係る実施形態である4方向天井カセット型の室内機を室内から見た斜視図である。It is the perspective view which looked at the four-way ceiling cassette type indoor unit which is an embodiment concerning the present invention from the room. 図1に示す4方向天井カセット型の室内機の熱交換器およびドレンパンの配置構成を示す平面図である。It is a top view which shows the arrangement configuration of the heat exchanger and drain pan of the four-way ceiling cassette type indoor unit shown in FIG. 図1に示す4方向天井カセット型の室内機の熱交換器およびドレンパンの配置構成を示す断面図である。It is sectional drawing which shows the arrangement configuration of the heat exchanger and drain pan of the four-way ceiling cassette type indoor unit shown in FIG. 図2に含まれるドレンポンプ周辺の構成を示す断面図である。It is sectional drawing which shows the structure of the drain pump periphery contained in FIG.

以下に、本発明に係る実施形態について添付図面を参照しながら詳細に説明する。この説明において、具体的な形状、材料、数値、方向等は、本発明の理解を容易にするための例示であって、用途、目的、仕様等にあわせて適宜変更することができる。また、以下において複数の実施形態や変形例などが含まれる場合、それらの特徴部分を適宜に組み合わせて用いることは当初から想定されている。   Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

空気調和装置10は、4方向天井カセット型の室内機であり、熱交換器12およびファン14が格納されたフレーム16、化粧パネル18に設けられたドレンパン20、ドレン水を排出するドレンポンプ24、および、制御部40(図4参照)を備えている。熱交換器12は、ファン14を取り囲むように略環状に配置され、より正確には一端が切り離された略C字状に配置されている。熱交換器12は、冷媒を圧縮する圧縮機(不図示)とともに冷凍サイクルを構成するものであり、ファン14によって化粧パネル18に設けられたパネル吸い込み口18aから吸い込まれる室内の空気と上記冷凍サイクルを構成する冷媒との間で熱交換を行い冷気または暖気を生成する。熱交換器12によって生成された冷気または暖気は、化粧パネル18に設けられた吹き出し口18bから室内へ供給される。   The air conditioner 10 is a four-way ceiling cassette type indoor unit, and includes a frame 16 in which the heat exchanger 12 and the fan 14 are stored, a drain pan 20 provided in the decorative panel 18, a drain pump 24 that discharges drain water, And the control part 40 (refer FIG. 4) is provided. The heat exchanger 12 is arranged in a substantially annular shape so as to surround the fan 14, and more precisely, is arranged in a substantially C shape with one end cut off. The heat exchanger 12 constitutes a refrigeration cycle together with a compressor (not shown) that compresses the refrigerant. The indoor air sucked from the panel suction port 18a provided in the decorative panel 18 by the fan 14 and the refrigeration cycle. Heat is exchanged with the refrigerant that constitutes, and cool air or warm air is generated. The cool air or the warm air generated by the heat exchanger 12 is supplied into the room from the air outlet 18b provided in the decorative panel 18.

図4は、ドレンパン20の一角に設けられた溜り部20aにおけるドレンポンプ24の構成を示す断面図である。ドレンパン20は、図2に示すように化粧パネル18の上面側に略四角形状を成す枠のように形成された凹部であり、図3に示すように熱交換器12の下端部と対向配置されており熱交換器12で発生するドレン(結露)水を一時的に貯留する機能を有している。このドレンパン20の溜り部20aには最も水深が深くなるように他の部分よりも深く形成された窪み部20dが設けられている。この窪み部20dの底面部には、ドレンプラグ20bが着脱可能に嵌め込まれた排出口20cが設けられている。また、ドレンパン20の他の部分の底面部には、溜り部20aに向かって緩やかな下り坂となるように勾配が設けられている。このため、熱交換器12で発生したドレン水はドレンパン20の溜り部20aに集められる。   FIG. 4 is a cross-sectional view showing the configuration of the drain pump 24 in the reservoir 20 a provided at one corner of the drain pan 20. The drain pan 20 is a recess formed like a substantially rectangular frame on the upper surface side of the decorative panel 18 as shown in FIG. 2, and is disposed opposite to the lower end of the heat exchanger 12 as shown in FIG. The drain (condensation) water generated in the heat exchanger 12 is temporarily stored. The reservoir 20a of the drain pan 20 is provided with a recess 20d formed deeper than the other parts so that the water depth is deepest. A discharge port 20c into which a drain plug 20b is detachably fitted is provided on the bottom surface of the recess 20d. Further, the bottom surface of the other part of the drain pan 20 is provided with a gradient so as to be a gentle downhill toward the reservoir 20a. For this reason, the drain water generated in the heat exchanger 12 is collected in the reservoir 20 a of the drain pan 20.

ドレンポンプ24は、溜り部20aに設けられている窪み部20dの直上に配置されており、ドレンパン20に貯留されているドレン水を吸い上げる機能を有し、漏斗状のハウジング26と、このハウジング26に格納された羽根車28と、羽根車28を回転駆動する駆動モータMを有している。ハウジング26は、下側先端部に円形の吸い込み口26aが形成されており、上端側の側面に排水配管30に接続された吐出口26bが設けられている。羽根車28は、駆動モータMによって回転駆動され、この回転に伴って発生する負圧によって吸い込み口26aから吸い上げたドレン水を吐出口26bから下流側の排水配管30へ吐出する。   The drain pump 24 is disposed immediately above the recess 20 d provided in the reservoir 20 a and has a function of sucking up drain water stored in the drain pan 20. The funnel-shaped housing 26 and the housing 26 And the drive motor M that rotationally drives the impeller 28. The housing 26 has a circular suction port 26a formed at the lower end portion, and a discharge port 26b connected to the drain pipe 30 on the side surface on the upper end side. The impeller 28 is rotationally driven by the drive motor M, and discharges drain water sucked up from the suction port 26a to the downstream drainage pipe 30 from the discharge port 26b by the negative pressure generated by the rotation.

排水配管30は、一端がハウジング26の吐出口26bに接続されており、略垂直に立ち上がってから天井裏を水平方向へ延び、他端が屋外の排水管に接続されるように形成されている。排水配管30は、保守時にホースを接続するための清掃口32、排水の逆流を防止する逆止弁34a、および、開放弁34bが排水経路にそれぞれ設けられている。この清掃口32は、排水配管30が略垂直に延びる部分に設けられたジョイント部30aから分岐して斜め上方にフレーム16を貫通して延びる配管35と、この配管35を封止する着脱可能な封止栓36とから構成されている。配管35を斜め上方に延ばすことにより、清掃口32から水が垂れにくくすることができる。   One end of the drainage pipe 30 is connected to the discharge port 26b of the housing 26. The drainage pipe 30 rises substantially vertically and then extends horizontally behind the ceiling, and the other end is connected to an outdoor drainage pipe. . The drainage pipe 30 is provided with a cleaning port 32 for connecting a hose during maintenance, a check valve 34a for preventing the backflow of drainage, and an open valve 34b in the drainage path. The cleaning port 32 includes a pipe 35 that branches from a joint portion 30a provided in a portion where the drain pipe 30 extends substantially vertically and extends obliquely upward through the frame 16, and a detachable seal that seals the pipe 35. And a sealing plug 36. By extending the pipe 35 obliquely upward, water can be prevented from dripping from the cleaning port 32.

逆止弁34aは、清掃口32よりも下流側における排水配管30が略水平に延びる部分に設けられたジョイント部30bに配置されており排水の逆流防止機能を有している。   The check valve 34a is disposed in a joint portion 30b provided at a portion where the drainage pipe 30 on the downstream side of the cleaning port 32 extends substantially horizontally, and has a function of preventing the backflow of drainage.

開放弁34bは、逆止弁34aの直上流側であってジョイント部30bの上面部に設けられており、逆止弁34aよりも上流側の排水配管30を外部に連通させる役割を有している。   The release valve 34b is provided on the upper surface portion of the joint portion 30b and immediately upstream of the check valve 34a, and has a role of communicating the drainage pipe 30 upstream of the check valve 34a to the outside. Yes.

なお、このジョイント部30bを透明な樹脂素材で形成してもよい。これにより、ジョイント部30bの内部にスライム等の汚れが溜まっているか否かを外部から目視で確認することができる。   The joint portion 30b may be formed of a transparent resin material. Thereby, it can be visually confirmed from the outside whether or not dirt such as slime is accumulated inside the joint portion 30b.

制御部40は、ファン14や圧縮機(不図示)を回転駆動することによって空気調和装置10の空調運転を制御する制御基板である。また、制御部40は、空調運転時および空調運転の停止時においてドレンパン20に貯留されるドレン水の水位が所定の基準水位に達していることをフロート(不図示)によって検知すると駆動モータMを所定の回転方向に回転駆動してドレン水を吸い上げて排水配管30へ排出する排水運転を実行する。
制御部40は、手動切替スイッチ40aを有している。この手動切替スイッチ40aは、清掃運転を行うために駆動モータMの回転方向を切り替える役割を有し、通常使用時にユーザが誤って操作してしまわないように室内機の制御基板である制御部40に設けられている。本実施形態では、手動切替スイッチ40aを制御部40に設けているが、例えば、室内機を操作するリモコン等に保守用の裏設定画面を設けておき、この裏設定画面を操作ボタン等を介して操作するようにしてもよい。但し、この場合には、ユーザが誤って裏設定画面を操作してしまうことがないようにパスワード等を入力しないと操作できないように設定したり、メーカや保守要員しか知らない裏設定画面を起動させるための隠しボタン等をリモコン内部に設けておくべきである。
制御部40は、保守点検時に手動切替スイッチ40aによって排水運転から清掃運転に運転モードが切り替えられると、ジョイント部30bの上面部分に設けられた開放弁34bを開放するとともに駆動モータMを上記所定の回転方向と反対方向に回転駆動する。これにより、開放弁34bから外気が導入されるため逆止弁34aが閉じていても排水配管30や羽根車28に付着しているスライム等の汚れを排水経路の上流側であるドレンパン20に向かって吸い出すことができる。ドレンパン20に吐出された汚れは、開放された排出口20cを開放して直下に設置されたバケツ等に排出される。なお、本実施形態では、手動切替スイッチ40aが清掃運転モードに切り替えられた場合にのみ反対方向に回転するように設定されている。
The control unit 40 is a control board that controls the air conditioning operation of the air conditioner 10 by rotationally driving the fan 14 and the compressor (not shown). Further, when the control unit 40 detects that the water level of the drain water stored in the drain pan 20 has reached a predetermined reference water level during the air-conditioning operation and when the air-conditioning operation is stopped, the control unit 40 detects the drive motor M. A drain operation is performed in which the drain water is sucked up and discharged to the drain pipe 30 by being rotationally driven in a predetermined rotation direction.
The controller 40 has a manual changeover switch 40a. The manual changeover switch 40a has a role of switching the rotation direction of the drive motor M in order to perform a cleaning operation, and the control unit 40 which is a control board of the indoor unit so that the user does not operate it by mistake during normal use. Is provided. In the present embodiment, the manual changeover switch 40a is provided in the control unit 40. However, for example, a back setting screen for maintenance is provided on a remote controller for operating the indoor unit, and this back setting screen is displayed via an operation button or the like. May be operated. However, in this case, you can set the settings so that they cannot be operated without entering a password, etc., so that the user will not accidentally operate the back settings screen, or start the back settings screen that only the manufacturer and maintenance personnel know. A hidden button etc. should be provided inside the remote control.
When the operation mode is switched from the drain operation to the cleaning operation by the manual changeover switch 40a during the maintenance inspection, the control unit 40 opens the release valve 34b provided on the upper surface portion of the joint unit 30b and drives the drive motor M to the predetermined value. Drives in the direction opposite to the rotation direction. As a result, outside air is introduced from the open valve 34b, so that even if the check valve 34a is closed, dirt such as slime adhering to the drainage pipe 30 and the impeller 28 is directed toward the drain pan 20 on the upstream side of the drainage path. Can be sucked out. The dirt discharged to the drain pan 20 is discharged into a bucket or the like installed immediately below by opening the opened discharge port 20c. In this embodiment, the manual changeover switch 40a is set to rotate in the opposite direction only when it is switched to the cleaning operation mode.

本実施形態に係る空気調和装置10によれば、保守時にドレンポンプ24を排出と反対方向に回転させることによってドレンポンプ24に溜まったスライム等の異物を取り除くことができる。その結果、ドレンポンプ24を分解洗浄する手間を要することなくスライムをドレンポンプ24から取り除くことができる等ドレン排出系を効果的に清掃することができる。   According to the air conditioner 10 according to the present embodiment, foreign matters such as slime accumulated in the drain pump 24 can be removed by rotating the drain pump 24 in the direction opposite to the discharge during maintenance. As a result, the drain discharge system can be effectively cleaned, for example, slime can be removed from the drain pump 24 without the need to disassemble and clean the drain pump 24.

上記実施形態では、制御部40が駆動モータMを反対方向に回転駆動するときに開放弁34bを開放する例を挙げて説明しているが、開放弁34bを開放する代わりに清掃口32の封止栓36を取り外すようにしてもよい。
また、封止栓36を取り外してホースを清掃口32の配管35に差し込んで水を流し込みながら駆動モータMを上記反対方向に回転駆動することにより、より効率良く排水配管30の内部に溜まっているスライム等の異物をドレンパン20に押し流すことができる。但し、この場合には、予めドレンプラグ20bを排出口20cから取り外すとともに、排出口20cから排出される水をバケツ等で受ける必要がある点に留意すべきである。
なお、排水配管30の内部の汚れがひどい場合には、清掃口32の配管35に湿式掃除機の吸い込み口を接続して吸引することによって汚れを除去してもよい。
In the above-described embodiment, an example is described in which the opening valve 34b is opened when the control unit 40 rotates the drive motor M in the opposite direction. However, instead of opening the opening valve 34b, the cleaning port 32 is sealed. The stopcock 36 may be removed.
Further, by removing the sealing plug 36 and inserting the hose into the pipe 35 of the cleaning port 32 and driving the drive motor M in the opposite direction while pouring water, the hose is accumulated in the drain pipe 30 more efficiently. Foreign matter such as slime can be swept away into the drain pan 20. However, it should be noted that in this case, it is necessary to remove the drain plug 20b from the discharge port 20c in advance and receive water discharged from the discharge port 20c with a bucket or the like.
In addition, when the dirt inside the drain pipe 30 is severe, the dirt may be removed by connecting the suction port of the wet cleaner to the pipe 35 of the cleaning port 32 and sucking it.

本実施形態では、ジョイント部30aに清掃口32を設けているが、ジョイント部30aに設ける代わりに、ジョイント部30bの逆止弁34aよりも排水経路の上流側部分に清掃口32を設けるようにしてもよい。   In the present embodiment, the cleaning port 32 is provided in the joint portion 30a. Instead of providing the joint portion 30a, the cleaning port 32 is provided in the upstream portion of the drainage path from the check valve 34a of the joint portion 30b. May be.

なお、本発明に係る空気調和装置は、上述した実施形態およびその変形例の構成に限定されるものではなく、本願の特許請求の範囲に記載された事項およびその均等の範囲内で種々の改良や変更が可能であることはいうまでもない。   The air-conditioning apparatus according to the present invention is not limited to the configuration of the above-described embodiment and its modifications, and various improvements can be made within the scope of matters described in the claims of the present application and their equivalents Needless to say, it can be changed.

10 空気調和装置、12 熱交換器、18 化粧パネル、20 ドレンパン、24 ドレンポンプ、28 羽根車、30 排水配管、40 制御部、40a 手動切替スイッチ、M モータ。




DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus, 12 Heat exchanger, 18 Cosmetic panel, 20 Drain pan, 24 Drain pump, 28 Impeller, 30 Drain piping, 40 Control part, 40a Manual changeover switch, M motor.




Claims (2)

熱交換器で発生したドレン水を貯留するドレンパンと、前記ドレンパンに貯留されたドレン水を排出するドレンポンプと、前記ドレンポンプの運転を制御する制御部とを有する空気調和装置であって、
前記制御部は、前記ドレンポンプを排出と反対方向に運転する清掃運転を実行可能である、
空気調和装置。
An air conditioner having a drain pan for storing drain water generated in a heat exchanger, a drain pump for discharging drain water stored in the drain pan, and a controller for controlling the operation of the drain pump,
The control unit is capable of executing a cleaning operation for operating the drain pump in a direction opposite to discharge.
Air conditioner.
請求項1に記載の空気調和装置において、
前記清掃運転を行うための手動切替スイッチをさらに備えている、空気調和装置。
In the air conditioning apparatus according to claim 1,
An air conditioner further comprising a manual changeover switch for performing the cleaning operation.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019156013A1 (en) * 2018-02-09 2019-08-15 三菱重工サーマルシステムズ株式会社 Clogging prevention control device for drain pump, air conditioner, and clogging prevention control method for drain pump

Citations (7)

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Publication number Priority date Publication date Assignee Title
JPS62136214A (en) * 1985-12-09 1987-06-19 Kazue Tanaka Sucking/discharging filter apparatus
JP2003042477A (en) * 2001-07-25 2003-02-13 Mitsubishi Electric Corp Air conditioner
JP2007240111A (en) * 2006-03-10 2007-09-20 Daikin Ind Ltd Air conditioner, drain up kit for air conditioner, and air conditioning system
JP2010276218A (en) * 2009-05-26 2010-12-09 Mitsubishi Electric Building Techno Service Co Ltd Air conditioner and method of cleaning drain sucking part of drain pump
JP2012247131A (en) * 2011-05-27 2012-12-13 Mitsubishi Electric Corp Air harmonizer
JP2013002719A (en) * 2011-06-15 2013-01-07 Mitsubishi Heavy Ind Ltd Air conditioner
JP2013108677A (en) * 2011-11-21 2013-06-06 Mitsubishi Electric Corp Air conditioner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62136214A (en) * 1985-12-09 1987-06-19 Kazue Tanaka Sucking/discharging filter apparatus
JP2003042477A (en) * 2001-07-25 2003-02-13 Mitsubishi Electric Corp Air conditioner
JP2007240111A (en) * 2006-03-10 2007-09-20 Daikin Ind Ltd Air conditioner, drain up kit for air conditioner, and air conditioning system
JP2010276218A (en) * 2009-05-26 2010-12-09 Mitsubishi Electric Building Techno Service Co Ltd Air conditioner and method of cleaning drain sucking part of drain pump
JP2012247131A (en) * 2011-05-27 2012-12-13 Mitsubishi Electric Corp Air harmonizer
JP2013002719A (en) * 2011-06-15 2013-01-07 Mitsubishi Heavy Ind Ltd Air conditioner
JP2013108677A (en) * 2011-11-21 2013-06-06 Mitsubishi Electric Corp Air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019156013A1 (en) * 2018-02-09 2019-08-15 三菱重工サーマルシステムズ株式会社 Clogging prevention control device for drain pump, air conditioner, and clogging prevention control method for drain pump

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