JPH03266765A - Air conditioner for railway car - Google Patents
Air conditioner for railway carInfo
- Publication number
- JPH03266765A JPH03266765A JP6421090A JP6421090A JPH03266765A JP H03266765 A JPH03266765 A JP H03266765A JP 6421090 A JP6421090 A JP 6421090A JP 6421090 A JP6421090 A JP 6421090A JP H03266765 A JPH03266765 A JP H03266765A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- storage tank
- heat storage
- air conditioner
- 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.)
- Pending
Links
- 238000005338 heat storage Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000005057 refrigeration Methods 0.000 claims description 17
- 238000004378 air conditioning Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000001143 conditioned effect Effects 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 2
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 2
- 239000001110 calcium chloride Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003570 air Substances 0.000 abstract 6
- 239000012080 ambient air Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000011555 saturated liquid Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、空１１装置に係り、特に鉄道車両に好適な鉄
道単画用空調装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air conditioning system, and particularly to a railway single-panel air conditioning system suitable for railway vehicles.
従来、鉄道車両用の空ｌｉ装置は、圧縮機、室内・外熱
交換器、室内・外送ａｍ、膨張装置が一体となったパイ
ケージタイプのものがほとんどで圧縮機によって常に一
定の冷凍サイクルを構成するようになっている。即ち、
圧縮機で過熱ガスにされた冷媒は室外熱交換器、室外送
風機により過冷却液にされる。さらに膨張手段（膨張弁
）によって低温・低圧の飽和液となる。この飽和液が室
内熱交換器内を通過する際に周囲の空気から熱を奪い、
冷気が生じるという仕組である。Conventionally, most air-liquid lithium-ion equipment for railway vehicles has been a pie cage type in which a compressor, indoor/outdoor heat exchanger, indoor/outdoor heat exchanger, and expansion device are integrated, and the compressor always maintains a constant refrigeration cycle. is configured. That is,
The refrigerant, which has been turned into superheated gas by the compressor, is turned into supercooled liquid by an outdoor heat exchanger and an outdoor blower. Furthermore, it becomes a low-temperature, low-pressure saturated liquid by the expansion means (expansion valve). When this saturated liquid passes through the indoor heat exchanger, it absorbs heat from the surrounding air,
The mechanism is to generate cold air.
なお、従来の空調装置の例としては、例えば、特開昭６
３−２７０２１８号が挙げられる。In addition, as an example of a conventional air conditioner, for example,
No. 3-270218 is mentioned.
上記従来技術は、圧縮機を常に運転し高温・高圧の冷媒
状態を作り出し前述のように室外熱交換器部で高温・高
圧の冷媒状態２１＃張装置で低温・低圧の飽和液の状態
を作り出すことによって室内熱交換器部で周囲の空気と
熱交換し、空気は冷却され冷媒は加熱される。あるいは
、この冷媒の流れを逆にすることにより、室内熱交換器
部で高温・高圧のガス状態を作り、冷媒は空気に熱を与
えて冷却され、空気は冷媒から熱を受は取る。これが冷
房、暖房の原理であるが、常に圧縮機を運転するため圧
縮機の入力が必要となる。電源容量に余裕があって長時
間走行しながら空調装置を運転する場合、走行速度が比
較的遅い車両には適用可能であるが、省エネルギーを要
する単画、短時間アクセス用車両、超高速車両（室外送
風機が走行風のために排風できない）に対しては配慮さ
れていない。The above conventional technology constantly operates the compressor to create a high temperature, high pressure refrigerant state, and as mentioned above, creates a high temperature, high pressure refrigerant state in the outdoor heat exchanger section, and creates a low temperature, low pressure saturated liquid state using a 21# tensioning device. As a result, heat is exchanged with the surrounding air in the indoor heat exchanger section, and the air is cooled and the refrigerant is heated. Alternatively, by reversing the flow of the refrigerant, a high temperature and high pressure gas state is created in the indoor heat exchanger section, the refrigerant gives heat to the air and is cooled, and the air receives and takes heat from the refrigerant. This is the principle of cooling and heating, but input to the compressor is required to constantly operate the compressor. If the power supply capacity is sufficient and the air conditioner is operated while driving for a long time, it can be applied to vehicles with relatively slow running speeds, but it can be applied to single-panel, short-time access vehicles, and ultra-high-speed vehicles that require energy conservation. No consideration is given to the problem that the outdoor blower cannot exhaust air due to the wind generated by the vehicle.
本発明の目的は、空調装置に与えられた電源容量が小さ
い場合、駅間を短時間でアクセスする場合、超高速車両
で室外送風機のｍ凧が期待できない場合に適した空調装
置を提供することにある。An object of the present invention is to provide an air conditioner suitable for cases where the power supply capacity given to the air conditioner is small, when access between stations is required in a short time, and when the outdoor blower cannot be expected to fly in an ultra-high-speed vehicle. It is in.
上記目的を達成するために、車両用空調装置を、冷凍サ
イクル構成機器とこの冷凍サイクルを運転することによ
り得られる熱を貯える蓄熱槽、蓄熱槽の熱を汲み上げ熱
交換器に送るポンプ、蓄熱槽の熱と周囲の空気を熱交換
させる熱交換器、熱交換された空気を配＾する送風機と
から構成し、冷凍サイクル構成後器を地上側の設備、そ
の他を車両側の設備とし分割する。これによって車内側
では室内送風後、ポンプの電力だけ見ればよい。また、
車両側設備の凝縮工程（冷房の場合）が蓄熱槽内で行な
われるため、超高速であっても走行風の影響ｆシない。In order to achieve the above objectives, the vehicle air conditioner consists of refrigeration cycle components, a heat storage tank that stores the heat obtained by operating the refrigeration cycle, a pump that pumps up the heat from the heat storage tank and sends it to a heat exchanger, and a heat storage tank. The refrigeration cycle consists of a heat exchanger that exchanges heat with the surrounding air, and a blower that distributes the heat-exchanged air.The refrigeration cycle is divided into two types, with the latter being equipment on the ground side and the rest being equipment on the vehicle side. As a result, inside the car, you only need to check the power of the pump after blowing air into the room. Also,
Since the condensation process (in the case of air conditioning) of the vehicle equipment is carried out in the heat storage tank, there is no influence from the running wind even at ultra-high speeds.
あるいは、車内側に吸収式冷？ｊＩ！、機を搭載し、外
部電源で熱部を加熱して蓄熱あるいは蓄冷する。貯えら
れた熱をポンプによって汲み上げ熱交換器に供給し、冷
気・暖気を得るが、この場合もポンプと送風機の電力が
あればよい。Or absorption cooling inside the car? jI! , equipped with an external power source to heat the hot part and store heat or cool. The stored heat is pumped up by a pump and supplied to a heat exchanger to obtain cold or warm air, but in this case as well, all you need is electricity for the pump and blower.
前記空Ｉｌ装置においては、冷凍サイクルを運転し四方
弁を切替えることによって、冷凍サイクル構成機器の一
部である蓄熱槽内熱交換器が加熱あるいは冷却され、蓄
熱槽は蓄熱、蓄冷する。この熱をポンプで汲み上げ熱交
換器に送り、この熱交換器に対して送風することにより
熱交換器部で周囲の空気と熱交換し冷気あるいは暖気を
作ることができる。冷凍サイクル構成ａ器を地上側設備
。In the empty Il device, by operating the refrigeration cycle and switching the four-way valve, the heat exchanger in the heat storage tank, which is a part of the refrigeration cycle constituent equipment, is heated or cooled, and the heat storage tank stores heat and cold. This heat is pumped up and sent to a heat exchanger, and by blowing air against the heat exchanger, the heat exchanger section exchanges heat with the surrounding air and can generate cold or warm air. The refrigeration cycle configuration A unit is installed on the ground side.
その他を車内側設備として駅等で蓄熱、蓄冷することに
よって、車両側の電源容量としては送風機とポンプだけ
でよい。By storing heat and cold in stations, etc. as equipment inside the train, only the blower and pump are required as the power supply capacity on the train side.
また、車両側設備の凝縮工程（冷房の場合）が蓄熱槽内
で行なわれるため、通常の車両用空調装置のように走行
風によって熱交換器を冷却する送風機の排＾が妨げられ
ることがない。In addition, since the condensation process (in the case of air conditioning) of the vehicle side equipment is carried out in the heat storage tank, the exhaust of the blower that cools the heat exchanger with the running air is not obstructed, unlike in normal vehicle air conditioners. .
以下、本発明の一実施例を第１図、′ｓ２図により説明
する。図において、空１１装置の構成は圧縮機１．四方
弁２．室内・外送風′ｌＩ＆？、 ３．室内・外熱交
換器６，４．流量制御弁５．蓄熱槽８．蓄熱槽内熱交換
器９およびポンプ稔から成る。車両側に搭載する要素を
室内送風機７．室内熱交換器６、ポンプ１２．蓄熱槽８
．蓄熱槽内熱交換器９とし残りを地上設備とする。なお
、蓄熱槽８内に充填するものとしては、水、または塩化
カルシュム等が用いられる。Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 1 and FIG.'s2. In the figure, the configuration of the air 11 device is compressor 1. Four-way valve 2. Indoor/outdoor ventilation 'lI&? , 3. Indoor/outdoor heat exchanger 6, 4. Flow control valve5. Heat storage tank 8. It consists of a heat exchanger 9 in a heat storage tank and a pump stem. The elements to be mounted on the vehicle side are the indoor blower7. Indoor heat exchanger 6, pump 12. Heat storage tank 8
．． The heat exchanger in the heat storage tank will be used as the heat exchanger 9, and the rest will be used as ground equipment. Note that water, calcium chloride, or the like is used to fill the heat storage tank 8.
車両側と地上側とは蓄熱槽内熱交換器９０入口および出
口１０．１１で結合あるいは切離し可能とする。駅で停
留中に地上側および車両側の設備を結合し、圧縮１！！
■を冷房あるいは暖房モードで運転する。冷房モードと
は冷媒の流れが圧縮ｆｉｌ、四方弁２．室外熱交換器４
．流量制御弁５．蓄熱槽内熱交換器９を経て再び圧縮′
ｌ１１１に戻るというもので暖房モードはこの逆である
。冷・暖房モードで運転することにより蓄熱槽内熱交換
器９が冷却あるいは加熱され、蓄熱槽８には冷熱、熱が
貯えられる。車両が走行状態に移るときは蓄熱槽内熱交
換器９の出入口ｓ１０．ｎの結合を解く。走行中は蓄熱
槽８に貯えられた熱をポンプＵによって室内熱交換器６
に供給し、ここで周囲の空気と熱交換させることで冷気
・暖気が得られ、空調を可能とする。一方、第２図の場
合は構成要素を吸収式％式％
送風機７．室内熱交換器６．ポンプじとしこれらを車両
に搭載することとする。駅では外部電源１４によってヒ
ータ１３を加熱し吸収式冷凍機１３により熱あるいは冷
熱を得て蓄熱槽８に貯える。走行する時は蓄熱槽８に貯
えた熱をポンプｎによって室内熱交換器６に供給し冷、
Ｉｌ！気を得るのは第１図の場合と同じである。The vehicle side and the ground side can be connected or separated at the inlet and outlet 10.11 of the heat exchanger 90 in the heat storage tank. While stopped at a station, the equipment on the ground side and on the vehicle side are combined and compressed 1! !
■Operate in cooling or heating mode. Cooling mode means that the flow of refrigerant is compressed fil, four-way valve 2. Outdoor heat exchanger 4
．． Flow control valve5. It is compressed again through the heat exchanger 9 in the heat storage tank.
The heating mode is the opposite of this, returning to l111. By operating in the cooling/heating mode, the heat exchanger 9 in the heat storage tank is cooled or heated, and the heat storage tank 8 stores cold heat and heat. When the vehicle moves to a running state, the entrance/exit s10 of the heat exchanger 9 in the heat storage tank is opened. Solve the bond of n. While driving, the heat stored in the heat storage tank 8 is transferred to the indoor heat exchanger 6 by the pump U.
By exchanging heat with the surrounding air, cold and warm air can be obtained, making air conditioning possible. On the other hand, in the case of Figure 2, the components are an absorption type blower7. Indoor heat exchanger6. These pumps will be installed in the vehicle. At the station, a heater 13 is heated by an external power source 14, and heat or cold is obtained by an absorption refrigerator 13 and stored in a heat storage tank 8. When driving, the heat stored in the heat storage tank 8 is supplied to the indoor heat exchanger 6 by the pump n to cool it.
Il! Obtaining qi is the same as in Figure 1.
以上述べたように本発明によると車両側としては、ポン
プと室内送風機の電力を賄えば良く、圧縮機や室外送風
機、四方弁等の電力は不要となるため、省エネルギーと
なり車両に通した空調装置を提供することができる。ま
た、超高速で走行する場合でも蓄熱槽内で熱交換するの
で走行風の影響を受けない空調装置が提供できる。As described above, according to the present invention, the vehicle side only needs to supply the power for the pump and indoor blower, and there is no need for power for the compressor, outdoor blower, four-way valve, etc., which saves energy and allows the air conditioner to run through the vehicle. can be provided. Furthermore, even when traveling at ultra-high speeds, heat is exchanged within the heat storage tank, making it possible to provide an air conditioner that is unaffected by traveling wind.
本発明によれば、車両側としてはポンプ、室内送風機の
みの電力で空調が行なえるので、省エネルギー車両に適
している。また、室外部の熱交換が蓄熱槽内で行なわれ
るので超高速車両でも走行風の影響を受けず安定した調
和空気が得られる。According to the present invention, air conditioning can be performed on the vehicle side using only electric power from a pump and an indoor blower, so it is suitable for an energy-saving vehicle. Furthermore, since heat exchange between the outside and outside of the room is carried out within the heat storage tank, stable conditioned air can be obtained even in ultra-high-speed vehicles without being affected by the running wind.
１！！１図は本発明による鉄道車両用空調装置の一実施
例を示す冷凍サイクルの回路図、第２図は本発明による
鉄道車両用空調装置の他の実施例を示す冷凍サイクルの
回路図である。
ｌ・・・・・・圧縮機、２・・・・・・四方弁、３・・
・・・・室外送風機、４・・・・・・室外熱交換器、５
・・・・・・流量制御弁、６・・−・−室内熱交換器、
７・・・・・・室内送風機、８・・・・・・蓄熱槽、９
・・・・・・蓄熱槽内熱交換器、１０．ｎ・・・・・・
蓄熱槽内熱交換器入口および出口、Ｌ・・・・・・ポン
プ、Ｂ・・−・・ヒータ、１４・・・・・・吸収式冷凍
機、ｂ・・・・・・外部電源
′Ａ Ｉ 図1! ! FIG. 1 is a circuit diagram of a refrigeration cycle showing one embodiment of the air conditioner for a railway vehicle according to the present invention, and FIG. 2 is a circuit diagram of a refrigeration cycle showing another embodiment of the air conditioner for a railway vehicle according to the present invention. l...Compressor, 2...Four-way valve, 3...
...Outdoor blower, 4...Outdoor heat exchanger, 5
...Flow rate control valve, 6...--Indoor heat exchanger,
7... Indoor blower, 8... Heat storage tank, 9
... Heat exchanger in heat storage tank, 10. n...
Inlet and outlet of heat exchanger in heat storage tank, L...Pump, B...Heater, 14...Absorption chiller, b...External power supply'A I diagram
Claims (1)
を運転することにより得られる熱を貯える蓄熱槽と、蓄
熱槽の熱を汲み上げるポンプと、ポンプによって供給さ
れた熱と周囲の空気と熱交換させる熱交換器と、熱交換
によって得られた調和空気を配風するための送風とから
構成したことを特徴とする鉄道車両用空調装置。 ２、請求項１記載の鉄道車両用空調装置において、冷凍
サイクル構成機器を地上側設備とし、蓄熱槽、ポンプ、
熱交換器、送風機を車両側設備とし分割することを特徴
とする鉄道車両用空調装置。 ３、請求項２記載の鉄道車両用空調装置において、地上
側と車両側設備の結合・分割を蓄熱槽内の熱交換器入口
および出口で行なうことを特徴とする鉄道車両用空調装
置。 ４、請求項２記載の鉄道車両用空調装置において、車両
側設備の冷房時における凝縮工程が蓄熱槽内で行なわれ
ることを特徴とする鉄道車両用空調装置。 ５、請求項１記載の鉄道車両用空調装置において、冷凍
サイクル構成機器を圧縮機、四方弁、室外熱交換器、室
外送風機、流量制御弁、膨張手段とし、その熱を貯えて
調和空気を作るものとして蓄熱槽、ポンプ、室内熱交換
器、室内送風機としたことを特徴とする鉄道車両用空調
装置。 ６、請求項１記載の鉄道車両用空調装置において、冷凍
サイクル構成機器を吸収式冷凍機、その熱を貯え調和空
気を作るものとしが蓄熱槽、ポンプ、室内熱交換器、室
内送風機としたことを特徴とする鉄道車両用空調装置。 ７、請求項６記載の鉄道車両用空調装置において、吸収
式冷凍機の熱源を外部電源による加熱装置の加熱とする
ことを特徴とする鉄道車両用空調装置。 ８、車体に蓄熱槽を設置けたことを特徴とする鉄道車両
。 ９、ヒートポンプ冷凍サイクルからなる空調装置におい
て、該ヒートポンプ冷凍サイクルの熱または冷熱発生系
を四方弁を介して蓄熱槽に連結したことを特徴とする空
調装置。[Claims] 1. A refrigeration cycle component, a heat storage tank that stores heat obtained by operating the refrigeration cycle component, a pump that pumps up the heat from the heat storage tank, and a pump that pumps up the heat supplied by the pump and the surroundings. 1. An air conditioner for a railway vehicle, comprising: a heat exchanger for exchanging heat with the air; and a blower for distributing the conditioned air obtained by the heat exchange. 2. In the railway vehicle air conditioner according to claim 1, the refrigeration cycle components are ground-side equipment, and a heat storage tank, a pump,
An air conditioning system for a railway vehicle, characterized in that a heat exchanger and a blower are separated as vehicle-side equipment. 3. The railway vehicle air conditioner according to claim 2, wherein the ground side and vehicle side equipment are connected and separated at the inlet and outlet of the heat exchanger in the heat storage tank. 4. The air conditioner for a railway vehicle according to claim 2, wherein the condensation step during cooling of the equipment on the vehicle side is performed in a heat storage tank. 5. In the railway vehicle air conditioner according to claim 1, the refrigeration cycle components are a compressor, a four-way valve, an outdoor heat exchanger, an outdoor blower, a flow rate control valve, and an expansion means, and the heat is stored to produce conditioned air. An air conditioner for a railway vehicle, characterized by comprising a heat storage tank, a pump, an indoor heat exchanger, and an indoor blower. 6. In the air conditioner for a railway vehicle according to claim 1, the refrigeration cycle components are an absorption refrigerator, and the devices that store the heat and produce conditioned air are a heat storage tank, a pump, an indoor heat exchanger, and an indoor blower. An air conditioner for railway vehicles featuring: 7. The air conditioner for a railway vehicle according to claim 6, wherein the heat source of the absorption chiller is heating of a heating device by an external power source. 8. A railway vehicle characterized by having a heat storage tank installed in the vehicle body. 9. An air conditioner comprising a heat pump refrigeration cycle, characterized in that the heat or cold generation system of the heat pump refrigeration cycle is connected to a heat storage tank via a four-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6421090A JPH03266765A (en) | 1990-03-16 | 1990-03-16 | Air conditioner for railway car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6421090A JPH03266765A (en) | 1990-03-16 | 1990-03-16 | Air conditioner for railway car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03266765A true JPH03266765A (en) | 1991-11-27 |
Family
ID=13251494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6421090A Pending JPH03266765A (en) | 1990-03-16 | 1990-03-16 | Air conditioner for railway car |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03266765A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015420A1 (en) * | 1996-10-01 | 1998-04-16 | Toyota Jidosha Kabushiki Kaisha | Air conditioning apparatus for vehicle |
| KR100472554B1 (en) * | 2002-06-11 | 2005-03-08 | 한국철도공사 | Air cooling and heating system for railway vehicle |
| JP2009184621A (en) * | 2008-02-08 | 2009-08-20 | Takasago Thermal Eng Co Ltd | Air conditioning system of subway vehicle |
| CN106969450A (en) * | 2017-04-19 | 2017-07-21 | 南京酷朗电子有限公司 | Metro Environment Control System and method |
| CN110715359A (en) * | 2019-10-17 | 2020-01-21 | 广东美的制冷设备有限公司 | Mobile air conditioning system |
-
1990
- 1990-03-16 JP JP6421090A patent/JPH03266765A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015420A1 (en) * | 1996-10-01 | 1998-04-16 | Toyota Jidosha Kabushiki Kaisha | Air conditioning apparatus for vehicle |
| US6427472B1 (en) | 1996-10-01 | 2002-08-06 | Toyota Jidosha Kabushiki Kaisha | Air conditioner for a vehicle |
| KR100472554B1 (en) * | 2002-06-11 | 2005-03-08 | 한국철도공사 | Air cooling and heating system for railway vehicle |
| JP2009184621A (en) * | 2008-02-08 | 2009-08-20 | Takasago Thermal Eng Co Ltd | Air conditioning system of subway vehicle |
| CN106969450A (en) * | 2017-04-19 | 2017-07-21 | 南京酷朗电子有限公司 | Metro Environment Control System and method |
| CN106969450B (en) * | 2017-04-19 | 2019-11-22 | 南京酷朗电子有限公司 | Metro Environment Control System and method |
| CN110715359A (en) * | 2019-10-17 | 2020-01-21 | 广东美的制冷设备有限公司 | Mobile air conditioning system |
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