JPS60196583A - Method of controlling operation of refrigerating open showcase - Google Patents

Method of controlling operation of refrigerating open showcase

Info

Publication number
JPS60196583A
JPS60196583A JP5293784A JP5293784A JPS60196583A JP S60196583 A JPS60196583 A JP S60196583A JP 5293784 A JP5293784 A JP 5293784A JP 5293784 A JP5293784 A JP 5293784A JP S60196583 A JPS60196583 A JP S60196583A
Authority
JP
Japan
Prior art keywords
cooler
solenoid valve
coolers
cold air
open showcase
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
Application number
JP5293784A
Other languages
Japanese (ja)
Inventor
務 佐藤
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5293784A priority Critical patent/JPS60196583A/en
Publication of JPS60196583A publication Critical patent/JPS60196583A/en
Pending legal-status Critical Current

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Landscapes

  • Freezers Or Refrigerated Showcases (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 本発明は、ケース前面等に形成した開口部に冷気エアに
よるエアカーテンを形成する冷凍冷蔵オープンショーケ
ースの運転制御方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to an operation control method for a refrigerated/refrigerated open showcase that forms an air curtain of cold air in an opening formed on the front surface of the case.

〔従来技術とその問題点〕[Prior art and its problems]

冷凍冷蔵オープンショーケースには、冷却能力の低下を
防ぐべくダクト内に冷却器を2基設けて、該冷却器を交
互に冷却運転、除霜運転するようにしたものがあるが、
まずかかる冷凍冷蔵オープンショーケースの全体構造と
従来の運転制御方法について説明し、よって本発明の目
的を明らかにする。
Some refrigerator/freezer open showcases are equipped with two coolers in the duct to prevent the cooling capacity from decreasing, and the coolers are operated alternately for cooling and defrosting.
First, the overall structure and conventional operation control method of such a frozen/refrigerated open showcase will be explained, thereby clarifying the purpose of the present invention.

第1図に示すように冷凍冷蔵オープンショーケースは、
商品出入用の開口部(2)を有する本体(1)内をダク
ト板(3)で商品収納庫(4)と冷気循環ダクト(6)
とに、またダクト板(5)で冷気循環ダクト(6)と保
護エア循環ダクト(7)とに区画し、前記冷気循環ダク
ト(6)内の一部を区画板(16)でさらに通路(17
a) (17b)とに区画して通路(17a)に冷却器
(18a)を、通路(17b)に冷却器(,18b)を
それぞれ配設し、冷気循環ダクト(6)と保護エア循環
ダクト(7)の上端及び下端をそれぞれ冷気吹出口(8
)、保護エア吹出口(9)及び吸込口(10)(11)
とに形成し、また冷気循環ダクト(6)の吸込口(10
)側に送風機(12)を設け、保護エア循環ダクト(7
)の吹出口(9)側に送風機(13)を設けたものであ
る。
As shown in Figure 1, the frozen/refrigerated open showcase is
A product storage compartment (4) and a cold air circulation duct (6) are constructed using a duct plate (3) inside the main body (1) which has an opening (2) for entering and exiting products.
In addition, the duct plate (5) divides the cold air circulation duct (6) and the protective air circulation duct (7), and a part of the cold air circulation duct (6) is further divided into a passage (16) by the partition plate (16). 17
a) A cooler (18a) is installed in the passage (17a), a cooler (18b) is installed in the passage (17b), and a cold air circulation duct (6) and a protective air circulation duct are installed. The upper and lower ends of (7) are connected to the cold air outlet (8
), protective air outlet (9) and suction port (10) (11)
and the inlet (10) of the cold air circulation duct (6).
) side is equipped with a blower (12), and a protective air circulation duct (7
) is provided with a blower (13) on the outlet (9) side.

この2基の冷却器(18a)(1−8b)には、第2図
に示すように、それぞれの冷却器(18a)(18b)
の冷媒液管(1,9a)(19b)に膨張弁(20a)
(20b)が配設され、各膨張弁(20a) (20b
)の上流側にそれぞれ電磁弁(21a”: (2l b
)が介装されて冷媒回路が形成され、この冷媒回路は凝
縮ユニ7)(22)に接続される。図中(23)は電磁
弁(’21a)(21’b)の開閉を制御するタイマ制
御装置である。
As shown in FIG. 2, these two coolers (18a) (1-8b) each have a
An expansion valve (20a) is installed in the refrigerant liquid pipe (1, 9a) (19b) of
(20b) are arranged, each expansion valve (20a) (20b
) on the upstream side of each solenoid valve (21a”: (2l b
) is inserted to form a refrigerant circuit, and this refrigerant circuit is connected to the condensing unit 7) (22). In the figure, (23) is a timer control device that controls opening and closing of the electromagnetic valves ('21a) and (21'b).

かかる冷凍冷蔵オープンショーケースにおいて、冷気吹
出口(8)、保護エア吹出口(9)より吹出される冷気
エアと保護エアとによるエアカーテンを形成して、庫内
を冷却する。この冷気エアと保護エアとは開口部(2)
からの室内空気の侵入を防ぎつつ、冷気吸込口(10)
 、保護エア吸込口(11)に吸込まれる。冷気吸込口
(10)から送風機(12)の働きで吸込まれた空気は
、2基の冷却器(18a)(18b)のうちいずれか一
方の冷却運転中の冷却器(例えば18a)で所定温度に
冷却され、再び冷気吹出口(8)に送られる。この時、
他方の冷却器(18b)は冷却運転を中止し、吸込口(
10)からの循環空気の保有する熱量を除電、の熱源と
するオフサイクル除霜を行う。また、保護エア吸込口(
11)から吸込まれた空気は、送風機(13)により保
護エア吹出口(9)に送られ循環する。
In such a freezer/refrigeration open showcase, the inside of the refrigerator is cooled by forming an air curtain of cold air and protective air blown out from the cold air outlet (8) and the protective air outlet (9). This cold air and protective air are connected to the opening (2).
While preventing indoor air from entering the room, the cold air intake port (10)
, is sucked into the protective air suction port (11). The air sucked in by the blower (12) from the cold air suction port (10) is brought to a predetermined temperature by one of the two coolers (18a) (18b) in the cooling operation (for example, 18a). The cooled air is cooled down to a temperature of 100.degree. C. and sent to the cold air outlet (8) again. At this time,
The other cooler (18b) stops cooling operation, and the suction port (
10) Off-cycle defrosting is performed using the amount of heat held by the circulating air from 10) as the heat source for static elimination. In addition, the protective air suction port (
The air sucked in from 11) is sent to the protective air outlet (9) by the blower (13) and circulated.

ところで従来の運転制御方法は、第3図に示すように、
一方の冷却器(18a)の電磁弁(21a)を閉じる(
または開く)と同時に他方の冷却器(18b)の電磁弁
(2’lb)を開く (または閉じる)よう、タイマ制
御装置(23)で電磁弁(21a> (2l b)の同
時切換を行い、交互に冷却器(18a)(18b)の冷
却運転を中断して除霜するようにし・でいた。このため
電磁弁(21a)(2l b)の同時切換時において冷
却器(18a)(18b)の圧力変化が激しくその結果
冷凍サイクルにハンチング現象が生じたり、また、一方
の電磁弁(21a)(又は21b)が閉じても同時に他
方の電磁弁(21b)(又は21a)が開かないことも
あり、このような電磁弁開閉のタイミングの時差や冷却
器(18a)(18b)の熱容量が原因で所定の冷却能
力に達するまでに時間がかかり、その結果、電磁弁切換
時に収納庫(4)内の温度が上昇しそ被冷却商品の品質
保持に支障をきたすおそれがある。
By the way, the conventional operation control method, as shown in Fig. 3,
Close the solenoid valve (21a) of one cooler (18a) (
The timer control device (23) simultaneously switches the solenoid valves (21a>(2l b)) so that the solenoid valve (2'lb) of the other cooler (18b) opens (or closes) at the same time The cooling operation of the coolers (18a) (18b) was alternately interrupted to defrost the air.For this reason, when the solenoid valves (21a) (2l b) are switched simultaneously, the cooling operation of the coolers (18a) (18b) is interrupted. As a result, a hunting phenomenon may occur in the refrigeration cycle, or even if one solenoid valve (21a) (or 21b) closes, the other solenoid valve (21b) (or 21a) may not open at the same time. However, due to the difference in the timing of opening and closing the solenoid valve and the heat capacity of the coolers (18a) (18b), it takes time to reach the specified cooling capacity, and as a result, when switching the solenoid valve, the storage compartment (4) There is a risk that the internal temperature will rise, which may impede the quality maintenance of the cooled product.

〔発明の目的〕[Purpose of the invention]

本発明の目的は前記従来例の不都合を解消し、安定した
冷凍サイクルが得られ、2基の冷却器の電磁弁切換時に
おける庫内温度の上昇を確実に防止し、その結果被冷却
商品の品質保持を図ることのできる冷凍冷蔵オープンシ
ョーケースの運転制御方法を提供することにある。
The purpose of the present invention is to eliminate the disadvantages of the conventional example, to obtain a stable refrigeration cycle, to reliably prevent the temperature inside the refrigerator from rising when the solenoid valves of the two coolers are switched, and as a result, to reduce the temperature of the products to be cooled. An object of the present invention is to provide a method for controlling the operation of a frozen/refrigerated open showcase that can maintain quality.

〔発明の要点〕[Key points of the invention]

しかしてこの目的は本発明によれば、ショーケース本体
内にエアカーテンを形成する冷気循環ダクトを設け、該
ダクト内に2基の冷却器を配設し、各冷却器の上流側に
開閉動作で冷却運転と除霜運転とに切換える電磁弁を設
けた冷凍冷蔵オープンショーケースにおいて、一方の冷
却器の電磁弁は他方の冷却器の電磁弁が閉しる少し前に
開くようにすることにより達成される。
However, according to the present invention, the purpose of the lever is to provide a cold air circulation duct that forms an air curtain inside the showcase body, to arrange two coolers in the duct, and to open and close the cooler on the upstream side of each cooler. In a refrigerator/freezer open showcase equipped with a solenoid valve that switches between cooling operation and defrosting operation, the solenoid valve of one cooler is opened slightly before the solenoid valve of the other cooler closes. achieved.

〔発明の実施例〕[Embodiments of the invention]

以下、図面について本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.

なお、本発明の運転制御方法で使用する冷凍冷蔵オープ
ンショーケースは第1図、第2図について説明したもの
と同様であるので詳細な説明は省略する。
Note that the refrigerated/refrigerated open showcase used in the operation control method of the present invention is the same as that described with reference to FIGS. 1 and 2, so detailed description thereof will be omitted.

本発明の冷凍冷蔵オープンショーケースの運転制御方法
は、電磁弁(21a)(21b)を交互に開閉して行う
ものであるが、運転動作は第4図のタイムチャートに示
すように、開閉時期は、一方の電磁弁(21a)(又は
21b)が閉じる少し前、例えば庫内を充分に冷却でき
るだけの時間、に他方の電磁弁(21b)(又は21a
)が開くようタイマ制御装置23に設定しておく。
The method of controlling the operation of a refrigerated open showcase of the present invention is performed by alternately opening and closing the solenoid valves (21a) and (21b). Shortly before one solenoid valve (21a) (or 21b) closes, for example, for a time long enough to sufficiently cool the inside of the refrigerator, the other solenoid valve (21b) (or 21a) is closed.
) is set in the timer control device 23 so that it opens.

こうして電磁弁(21a) (2l b)が開の状態で
冷却器(18a) (18b)が冷却運転を行い、閉の
状態で冷却運転を中止してオフサイクル除霜を行うが、
いま、電磁弁(2’la)が開き、電磁弁(2l b)
が閉じていると凝縮ユニット(22)から送られてくる
冷媒は膨張弁(2a)を介して冷媒液管(19a)を通
って冷却器(18aから再び凝縮ユニソ)(22)へと
流れ、こに冷凍サイクルが形成されて冷却器(18a)
が冷却運転し、吸込口(10)から吸込まれた空気は冷
却器<18a)で冷却されたのち、吹出口(8)から吹
出されて冷気エアカーテンを形成し、開口部(2)を閉
塞する。この時、保護エア循環ダクト(7)に吸込まれ
た空気は送風機(13)によって吹出口(9)から吹出
されて前記冷気エアカーテンの外側に保護エアカーテン
を形成する。
In this way, when the solenoid valves (21a) and (2l b) are open, the coolers (18a and 18b) perform a cooling operation, and when they are closed, the cooling operation is stopped and off-cycle defrosting is performed.
Now, the solenoid valve (2'la) opens and the solenoid valve (2l b) opens.
When the refrigerant is closed, the refrigerant sent from the condensing unit (22) flows through the expansion valve (2a), the refrigerant liquid pipe (19a), and the condensing unit (22) from the condenser (18a again). A refrigeration cycle is formed here and the cooler (18a)
is in cooling operation, and the air sucked in from the suction port (10) is cooled by the cooler <18a) and then blown out from the blowout port (8) to form a cold air curtain and close the opening (2). do. At this time, the air sucked into the protective air circulation duct (7) is blown out from the outlet (9) by the blower (13) to form a protective air curtain outside the cold air curtain.

一方、冷却器(18b)には冷媒が流れず冷却運転を中
断し、送風機(12)の送風を受けて空気の保有する熱
量を除霜の熱源とするオフサイクル除霜が行われる。
On the other hand, no refrigerant flows through the cooler (18b), so the cooling operation is interrupted, and off-cycle defrosting is performed in which the heat quantity of the air blown by the blower (12) is used as the heat source for defrosting.

次に、所定時間が経過すると電磁弁(2l b)が開と
なるがこの時既に開の電磁弁(21a)は開状態を続行
するので、冷媒は冷却器(18a)と冷却器(18b)
の両方に流れ、2基の冷却器(18a)(18b)はと
もに冷却運転と−なる。
Next, after a predetermined period of time has elapsed, the solenoid valve (2l b) opens, but at this time the already open solenoid valve (21a) continues to be open, so the refrigerant is transferred to the cooler (18a) and the cooler (18b).
Both of the two coolers (18a) and (18b) are in cooling operation.

そして、さらに所定時間が経過すると今度は電磁弁(2
1a)が閉となり、電磁弁(2l b)だけが開の状態
になるので、冷却器(18b)は冷却運転を継続するが
、冷却器(18a)には冷媒が流れず冷却運転を中断し
、送風機(12)の送風を受けて空気の保有する熱量を
除霜の熱源とするオフサイクル除霜が行われる。
Then, after a further predetermined period of time has elapsed, the solenoid valve (2
1a) is closed and only the solenoid valve (2l b) is open, so the cooler (18b) continues its cooling operation, but no refrigerant flows into the cooler (18a) and the cooling operation is interrupted. Off-cycle defrosting is performed in which the amount of heat held by the air blown by the blower (12) is used as the defrosting heat source.

このようにして、いずれか一方の冷却器の除霜中に他方
の冷却器によりケース内を冷却することで、冷却を中断
することなく冷却と除霜を同時に行ない、しかも一方の
冷却器(18a)(又は18b)の電磁弁(21a)(
又は21b)が閉して除霜運転に入る前、他方の冷却器
(18b)(又は18b)の電磁弁(21b)’(又は
21a)が開いて冷却運転に入るので、この間は2基の
冷却器(18a)(18b)の冷却運転がラップし、庫
内は急速に冷却される。
In this way, by cooling the inside of the case with one of the coolers while the other cooler is defrosting, cooling and defrosting can be performed simultaneously without interrupting cooling. ) (or 18b) solenoid valve (21a)(
or 21b) closes and starts defrosting operation, the solenoid valve (21b)' (or 21a) of the other cooler (18b) (or 18b) opens and starts cooling operation, so during this time, the two The cooling operation of the coolers (18a) and (18b) wraps, and the inside of the refrigerator is rapidly cooled.

こうして、第5図に示すように、冷却器(18a、)(
18b)の運転時は凝縮ユニットとバランスする蒸発温
度(ET2)における冷却能力(Q2)が得られ、冷却
管1基の運転時の冷却能力(Ql)は凝縮ユニットとバ
ランスする蒸発温度(ETl)が冷却器2基運転時の蒸
発温度(ET2)より低温温度となるため、冷却器2基
運転時の冷却能力(Q2)の約80%の冷却能力となる
In this way, as shown in FIG.
When operating 18b), the cooling capacity (Q2) at the evaporation temperature (ET2) that is balanced with the condensing unit is obtained, and the cooling capacity (Ql) when operating one cooling pipe is obtained at the evaporation temperature (ETl) that is balanced with the condensing unit. Since the temperature is lower than the evaporation temperature (ET2) when two coolers are operated, the cooling capacity is approximately 80% of the cooling capacity (Q2) when two coolers are operated.

従って、冷却器1基運転となっても、冷却器2基運転で
庫内は既に充分に冷却されているので冷却能力は冷却器
2基の運転時に比してあまり低下せず収納庫(4)内温
度の上昇はわずかである。
Therefore, even if one cooler is operated, the inside of the storage is already sufficiently cooled by two coolers, so the cooling capacity does not decrease much compared to when two coolers are operated. ) The rise in internal temperature is slight.

なお、本実施例では、冷却器(18a)(18b)を冷
気循環ダクト(6)の前後方向に設けたショーケースを
用いた場合を示しているが、該冷気循環ダクト(6)内
の上下方向に配設してもよく、また、冷気エア循環ダク
ト内と保護エア循環ダクト内とにそれぞれ冷却器を設け
るようにしたものでも実施可能である。さらに、不実施
例では、凝縮ユニット(22)を別置とする冷凍冷蔵オ
ープンショーケースについて説明したが、凝縮ユニット
を内蔵した冷凍冷蔵オープンショーケースに本発明を適
用してもよい。
In this embodiment, a showcase is used in which the coolers (18a) and (18b) are installed in the front and back direction of the cold air circulation duct (6), but the upper and lower parts of the cold air circulation duct (6) are Alternatively, a cooler may be provided in the cold air circulation duct and the protective air circulation duct, respectively. Further, in the non-embodiment, a frozen/refrigerated open showcase with a separate condensing unit (22) has been described, but the present invention may be applied to a frozen/refrigerated open showcase with a built-in condensing unit.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明の冷凍冷蔵オープンショーケー
スの運転制御方法は、2基の冷却器の冷却運転で庫内を
充分に冷却してから、1基の5の冷却運転に入るので、
他の冷却器が運転を中止して除霜に入っても庫内温度が
上昇することなく庫内商品の品質を保持できる。
As described above, in the operation control method of the freezer/refrigerator open showcase of the present invention, after the interior of the refrigerator is sufficiently cooled by the cooling operation of the two coolers, the cooling operation of the one cooler (5) is started.
Even if other coolers stop operating and start defrosting, the temperature inside the refrigerator does not rise and the quality of the products in the refrigerator can be maintained.

また、一方の冷却器が冷却運転に入る時は、他の冷却器
は冷却運転中であるから、冷却器の圧力変化が小さく、
さらに電磁弁開閉の時期に多少のズレが生じても冷凍サ
イクルに及ぼす影響は小さいから、安定した冷凍サイク
ルが得られるものである。
Also, when one cooler goes into cooling operation, the other cooler is in cooling operation, so the pressure change in the cooler is small.
Furthermore, even if there is a slight deviation in the timing of opening and closing the electromagnetic valve, the effect on the refrigeration cycle is small, so a stable refrigeration cycle can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は冷凍冷蔵オープンショーケースの縦断側面図、
第2図は同上冷媒回路図、第3図は従来の運転動作を示
すタイムチャート、第4図は本発明方法の実施例を示す
タイムチャート、第5図は朶発?11に度に対する凝縮
ユニット及び冷却器1基運転時と冷却器2ノ、(運転時
の冷却能力を示すグラフである。 (1)・・・オープンショーケース本体(2)・・・開
口部 (3)・・・ダクト板(4)・・・商品収納庫 
(5)・・・ダクト板(6)・・・冷気循環ダクI−(
7)・・・保護エア循環ダクト(8)・・・冷気吹出n
 (9)・・・保護エア吹出口(10) (1,1)・
・・吸込口 (12) (13)・・・送風機(16)
 −・・区搏j扱 (]7a ) (17b ) −・
・通路(18a ) (181) )・・・冷却器(1
9a ) (19b ) −−−冷媒/lk ’tW(
20a ) (20b ) −膨張弁(21a ) (
21b ) −電磁弁(22)・・・凝縮ユニノl−(
23)・・・タイマ制御装置代理人 弁理士 大音 増
h1「 第1図 3 第2図 第5図 革発承尺ET(0C) 第3I′、4 り)°ジ 7t jン1
Figure 1 is a longitudinal side view of a frozen/refrigerated open showcase.
Fig. 2 is a refrigerant circuit diagram of the same as above, Fig. 3 is a time chart showing conventional operation, Fig. 4 is a time chart showing an embodiment of the method of the present invention, and Fig. 5 is a diagram of the original operation. 11 is a graph showing the cooling capacity when one condensing unit and cooler is in operation and when two coolers are in operation. (1)... Open showcase body (2)... Opening ( 3)...Duct board (4)...Product storage
(5)...Duct plate (6)...Cold air circulation duct I-(
7)...Protective air circulation duct (8)...Cold air blowout n
(9)...Protective air outlet (10) (1,1)
...Suction port (12) (13) ...Blower (16)
---Ku 搏j treatment (]7a) (17b) ---
・Passage (18a) (181))...Cooler (1)
9a) (19b)---Refrigerant/lk'tW(
20a) (20b) - Expansion valve (21a) (
21b) - Solenoid valve (22)...Condensation unino l-(
23) ...Timer control device agent Patent attorney Masu Ohone

Claims (1)

【特許請求の範囲】[Claims] シジーケース本体内にエアカーテンを形成する冷気循環
ダクトを設け、該ダクト内に2基の冷却器を配設し、各
冷却器の上流側に開閉動作で冷却運転と除霜運転とに切
換える電磁弁を設けた冷凍冷蔵オープンショーケースに
おいて、一方の冷却器の電磁弁は他方の冷却器の電磁弁
が閉じる少し前に開くようにしたことを特徴とする冷凍
冷蔵オープンショーケースの運転制御方法。
A cold air circulation duct that forms an air curtain is provided inside the syzzy case body, and two coolers are installed within the duct, and a solenoid valve that opens and closes to switch between cooling operation and defrosting operation is installed on the upstream side of each cooler. 1. A method for controlling the operation of a freezer/refrigerator open showcase, characterized in that the solenoid valve of one cooler is opened slightly before the solenoid valve of the other cooler is closed.
JP5293784A 1984-03-19 1984-03-19 Method of controlling operation of refrigerating open showcase Pending JPS60196583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5293784A JPS60196583A (en) 1984-03-19 1984-03-19 Method of controlling operation of refrigerating open showcase

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5293784A JPS60196583A (en) 1984-03-19 1984-03-19 Method of controlling operation of refrigerating open showcase

Publications (1)

Publication Number Publication Date
JPS60196583A true JPS60196583A (en) 1985-10-05

Family

ID=12928777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5293784A Pending JPS60196583A (en) 1984-03-19 1984-03-19 Method of controlling operation of refrigerating open showcase

Country Status (1)

Country Link
JP (1) JPS60196583A (en)

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