WO2021199102A1 - 逆止弁フラッパ装置及びスイッチギヤ - Google Patents

逆止弁フラッパ装置及びスイッチギヤ Download PDF

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Publication number
WO2021199102A1
WO2021199102A1 PCT/JP2020/014436 JP2020014436W WO2021199102A1 WO 2021199102 A1 WO2021199102 A1 WO 2021199102A1 JP 2020014436 W JP2020014436 W JP 2020014436W WO 2021199102 A1 WO2021199102 A1 WO 2021199102A1
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WO
WIPO (PCT)
Prior art keywords
flapper
check valve
frame
housing
latch
Prior art date
Application number
PCT/JP2020/014436
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
達哉 ▲濱▼田
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to DE112020007007.7T priority Critical patent/DE112020007007T5/de
Priority to JP2022512500A priority patent/JP7321362B2/ja
Priority to PCT/JP2020/014436 priority patent/WO2021199102A1/ja
Publication of WO2021199102A1 publication Critical patent/WO2021199102A1/ja

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H02B1/565—Cooling; Ventilation for cabinets

Definitions

  • the present application relates to a check valve flapper device and a switchgear provided with a check valve flapper device.
  • a flapper is attached to the ventilation port on the front or rear of the switchgear, which may be operated by humans, and it is kept open at all times, and in the event of a short-circuit accident, it is closed by the gas pressure generated inside.
  • a support valve flapper is attached (see, for example, Patent Document 1 and Patent Document 2).
  • the arc shielding damper device which is a check valve flapper disclosed in Patent Document 1, operates rotatably by a hinge attached to the upper part of the damper plate.
  • the flanges on both sides of the damper plate and the bracket of the housing are bolted at the upper part, and the bolt channel of the flange and the wheel bearing channel of the bracket are slidably attached by bolts via the bearing wheel at the lower part. ing.
  • the bearing wheel of the wheel bearing channel is seated in the notch so that the damper plate is at a certain angle on the housing side.
  • the damper plate When high temperature and high pressure gas is generated inside the housing, the damper plate receives pressure in the closing direction due to the pressure, and at the same time, high temperature and high pressure gas may be discharged to the outside from the side of the damper plate. When the high-temperature and high-pressure gas is discharged to the outside, the pressure for pushing the damper plate in the closing direction decreases, and the damper plate may not close smoothly.
  • Patent Document 2 when the arc shield is in the open position, it acts to hold the arc shield, and when a high temperature and high pressure gas is generated, the flow of the high temperature and high pressure gas does not come into contact with the ventilation assembly.
  • the arranged arc shield side holding plate is disclosed.
  • Patent Document 2 a lock mechanism and an urging spring are used to suppress the rebound of the arc shield due to the pressure of the high-pressure gas.
  • a lock mechanism and an urging spring are used to suppress the rebound of the arc shield due to the pressure of the high-pressure gas.
  • the present application discloses a technique for solving the above-mentioned problems, and a check valve that can be moved to an open position without using a special jig while suppressing the bounce of the flapper portion with a simple structure. It is an object of the present invention to provide a valve flapper device and a switchgear using the check valve flapper device.
  • the check valve flapper device includes a frame body, a flapper portion whose upper portion is rotatably fastened to the frame body and an L-shaped bent portion at the lower portion, and the flapper portion at a predetermined angle.
  • a flapper holding portion for detachably holding the flapper is attached, and a flapper side frame covering both sides between the flapper portion and the frame body held at a predetermined angle and a flapper side frame provided on the frame body are provided.
  • the L-shaped bent portion is engaged with the latch portion, and the latch portion can be disengaged by a release lever provided at a position facing the flapper portion.
  • a circuit breaker chamber in which a circuit breaker is housed, a bus chamber in which a bus connected to the circuit breaker is housed, and a cable connected to the circuit breaker are housed inside the housing. It includes a cable chamber and the above-mentioned check valve flapper device attached to the panel of the housing.
  • a check valve flapper device capable of suppressing the bounce of a flapper with a simple structure and moving to an open position without using a special jig, and a switch using this check valve flapper device. It becomes possible to provide a gear.
  • FIG. 3B is a perspective view showing the structure of the check valve gas flapper device according to the first embodiment
  • FIG. 3B is a perspective view and an enlarged view of a latch portion as viewed from the direction of arrow Y in FIG. 3A.
  • sectional drawing shows the structure of the check valve gas flapper apparatus which concerns on Embodiment 1, and is sectional drawing in the direction AA in FIG.
  • FIG. 9B is a perspective view showing the structure of the check valve flapper device according to the second embodiment, and FIG. 9B is a perspective view seen from the direction of arrow Z in FIG. 9A.
  • FIG. 1 is a right side view showing an example of the structure of the switchgear according to the first embodiment.
  • the switch gear 1 is divided into a plurality of compartments in the housing 10, a circuit breaker chamber 20 in which the circuit breaker 21 is housed, a bus chamber 30 in which the bus 31 is housed, and a current transformer (CT: Current).
  • CT Current
  • Rear cable 51 containing connected cables for each device such as a Transformer), a transformer (VT: Voltage Transformer), a lightning arrester (SAR: Surge Arrester), and a zero-phase current transformer (ZCT: Zero-phase Current Transformer).
  • a front cable chamber 40 located in front of the chamber 50 and the rear cable chamber is provided. Ventilation ports 13 provided on the ceilings of the bus chamber 30 and the rear cable chamber 50 act to suppress the temperature rise in the room.
  • the circuit breaker chamber 20 may be provided with a mobile transformer.
  • the check valve flapper device 100 (hereinafter referred to as "flapper device") 100 is attached to the panel portion of the housing 10.
  • the flapper device 100 is provided on the front door 11 of the circuit breaker chamber 20, the inside of the front door 11 of the front cable chamber 40, and the rear upper cover 12a and the rear lower cover 12b of the rear cable chamber 50, respectively. ..
  • the flapper device 100 is normally used as a ventilation port, and serves as a check valve that prevents gas from flowing out of the housing 10 when an internal arc is generated. Therefore, if space is allowed, it is desirable to arrange a plurality of them as shown in FIG. 1, but considering the possibility of generating high-temperature and high-pressure gas due to arc generation and the influence on the surroundings of the switchgear 1, at least the back surface. It is desirable to provide the flapper device 100 on the lower back cover 12b of the cable chamber 50.
  • FIG. 2 is a diagram showing an example of the structure of the flapper device 100, and is a view of the flapper device 100 provided on the rear lower cover 12b of the rear cable chamber 50 in FIG. 1 as viewed from the direction of arrow X.
  • the flapper device 100 has a frame body 102 for attaching to the ventilation port of the back lower cover 12b, a hinge portion 103 for rotatably attaching the flapper portion 101 to the frame body 102, and a side portion of the flapper portion 101.
  • the flapper side frames 104a and 104b provided with a flapper holding portion for holding the cover flapper plate in the open position are provided.
  • the flapper side frames 104a and 104b are also attached to the frame body 102.
  • FIG. 3 is a perspective view showing the structure of the flapper device 100
  • FIG. 3B is a perspective view seen from the Y direction in FIG. 3A.
  • the inside of the circle in FIG. 3B is an enlarged view of the latch portion 106.
  • the Y direction indicates that the housing 10 is viewed from the outside.
  • the flapper portion 101 has a shallow housing structure, is provided at the upper end portions of the flapper surface 101a and the flapper surface 101a that receive gas pressure when high-temperature and high-pressure gas is generated, and extends in a direction opposite to the direction of receiving gas pressure.
  • the flapper upper portion 101b and the lower end portion of the flapper surface 101a are provided so as to extend in the direction opposite to the direction in which the gas pressure is received, and are engaged with the latch portion 106 by the L-shaped bent portion.
  • the flapper lower portion 101c and the flapper surface 101a are provided with flapper side portions 101d and 101e extending in a direction opposite to the direction in which the gas pressure is received. However, in FIG. 3, the flapper side portion 101d is not shown.
  • the flapper side frames 104a and 104b extend from the frame surfaces 104a1 and 104b1 and the frame surfaces 104a1 and 104b1 which are fan-shaped covering the side portions between the flapper portion 101 and the frame body 102, respectively, and extend to the flapper surface 101a side. It has flanges 104a2 and 104b2 that are bent.
  • the frame surfaces 104a1 and 104b1 of the flapper side frames 104a and 104b cover the space on the side where the flapper side portions 101d and 101e of the flapper portion 101 move from the open position to the closed position shown in FIG. , 101e is provided outside.
  • the flapper portion 101 when the flapper portion 101 is in the open position, the flapper portion 101 is held by the flapper holding portion 105 at a predetermined angle, for example, an angle of about 20 ° from the closed position.
  • a predetermined angle for example, an angle of about 20 ° from the closed position.
  • the flapper portion 101 when the flapper portion 101 is in the open position, it is desirable to arrange the flapper surface 101a so as to be in contact with the inner surfaces of the flanges 104a2 and 104b2 of the flapper side frames 104a and 104b.
  • the frame body 102 is provided with an inner frame 102a so as to project toward the inside of the housing 10, that is, toward the flapper portion 101, and a latch portion 106 is attached to the center of the lower portion.
  • FIG. 4 and 5 are cross-sectional views showing the structure of the flapper device, and are cross-sectional views in the AA direction in FIG.
  • FIG. 4 shows a state in which the flapper portion 101 is in the open position
  • FIG. 4B shows a state in which the flange 104a2 of the flapper side frame 104a is overlapped with FIG. 4A
  • FIG. 5 shows a closed position in which the flapper portion 101 moves toward the frame body 102 and is closed
  • FIG. 5B shows a state in which the flange 104a2 of the flapper side frame 104a is overlapped with FIG. 5A.
  • the flapper holding portion 105 is a removable fastener such as a ball catch.
  • the flapper holding portion 105 includes a ball portion 105b, which is a male portion of the fastener, and a catch portion 105a, which is a female portion.
  • the ball portion 105b is attached to the flange 104a2 of the flapper side frame 104a, and the catch portion 105a is attached to the flapper side portion 101d of the flapper portion 101.
  • the ball portion 105b and the catch portion 105a are fitted and the flapper portion 101 is held in the open position.
  • the ball catch is removable and only needs to have a holding force capable of holding the flapper portion 101 trying to close by its own weight. Since the holding force is not high, even if a low gas pressure is applied to the flapper surface 101a. It is easy to operate.
  • the flapper portion 101 moves from the open position to the closed position, the flapper side portion 101d of the flapper portion 101 moves along the flange 104a2 of the flapper side frame 104a. Further, in the closed position, the flapper portion 101 is locked by the latch portion 106 so that the flapper portion 101 surrounds the inner frame 102a as a housing.
  • FIG. 6 is a diagram for explaining the closing operation of the flapper portion 101 of the flapper device
  • FIG. 7 is a diagram for explaining the operation of moving the closed flapper portion 101 to the open position. It corresponds to a cross-sectional view seen from the direction. 6A1, FIG. 6B1, FIG. 6C1, FIG. 6D1 show how the flapper portion 101 closes in this order, and FIGS. 6A2, 6B2, 6C2, and 6D2 show enlarged views of the corresponding latch portions 106. Shown. First, the structure of the latch portion 106 will be described with reference to FIG. 6A2.
  • the latch portion 106 is attached to the lower portion of the inner frame 102a, and includes a latch 106a protruding from the lower portion, a groove portion 106b between the latch 106a and the frame body 102 side, and a release lever 106c.
  • FIGS. 6A1 and 6A2 the flapper portion 101 is held by the flapper holding portion 105.
  • the flapper holding portion 105 is disengaged, and the flapper portion 101 starts moving around the flapper upper portion 101b.
  • the outflow of gas is prevented by the flapper side frames 104a and 104b located on both sides of the flapper portion 101.
  • FIGS. 6B1 and 6B2 when the flapper portion 101 approaches the inner frame 102a, the tip of the L-shaped bent portion of the flapper lower portion 101c comes into contact with the latch 106a, and the latch portion 106 begins to rise, and FIGS. 6C1 and 6C2. Proceed to the position shown in. As shown in FIGS. 6D1 and 6D2, when the tip of the L-shaped bent portion of the flapper lower portion 101c enters the groove portion 106b, the latch portion 106 descends as shown by an arrow, and the tip of the flapper lower portion 101c is the latch portion 106. The flapper portion 101 is stopped by being engaged with, and the bounce is suppressed.
  • FIG. 7 shows how the flapper portion 101 is moved to the closed position in the order of FIGS. 7A1, 7B1, 7C1, and 7D1, and FIGS. 7A2, 7B2, 7C2, and 7D2 are enlarged versions of the corresponding latch portion 106.
  • FIGS. 7A1 and 7A2 the tip of the L-shaped bent portion of the flapper lower portion 101c of the flapper portion 101 is engaged with the latch portion 106, and the flapper portion 101 is in the closed position.
  • the release lever 106c of the latch portion 106 is pulled up from the outside of the housing as shown by an arrow.
  • the release lever 106c is provided on the side facing the flapper portion 101, that is, on the outer side of the housing 10, the operation is easy.
  • FIGS. 7B1 and 7B2 since the latch portion 106 is pulled up, the tip of the L-shaped bent portion of the flapper lower portion 101c engaged with the groove portion 106b can be pulled out from the groove portion 106b.
  • the flapper portion 101 is pushed toward the inside of the housing from the outside of the housing. If the tip of the flapper lower portion 101c comes out of the groove portion 106b, further operation of the release lever 106c is unnecessary. As shown in FIGS.
  • the operation of moving the closed flapper portion 101 from the closed position to the open position can also be used when assembling the switch gear 1. That is, when the frame body 102 to which the inner frame 102a, the flapper portion 101, the hinge portion 103, and the flapper side frames 104a and 104b are attached is attached to the back lower cover 12b, if the flapper portion 101 is attached in the open position, it will be attached at the time of attachment. Workability is inferior due to imbalance of the frame body 102, movement of the flapper portion 101, and the like. However, after the flapper portion 101 is fixed in the closed position and the frame body 102 is attached to the housing 10, the flapper portion 101 can be easily moved to the open position as shown in the present embodiment. Therefore, not only the operation of the flapper unit 101 becomes simple, but also the workability is improved.
  • the flapper portion 101 whose upper portion is rotatably fastened to the frame body 102 and which has an L-shaped bent portion at the lower portion and the flapper portion 101 are attached and detached.
  • Flapper side frames 104a and 104b which are attached to freely holding flapper holding portions 105 and cover both sides between the flapper portion 101 and the frame body 102 held at a predetermined angle, and an inner frame of the frame body. Since the latch portion 106 provided at the lower part of the 102a is provided, when the high temperature and high pressure gas is generated due to the arc generation, the holding of the flapper portion 101 is easily released, the flapper portion 101 moves from the open position to the closed position, and the flapper is generated.
  • the side frames 104a and 104b prevent the outflow of gas. Further, since the L-shaped bent portion at the lower part of the flapper portion 101 is engaged with the latch portion 106, it is possible to suppress the rebound of the flapper with a simple structure. Even if the gas pressure is high and the flapper portion 101 may bounce off the latch portion 106, the flapper portion 101 moves in the direction of the latch portion 106 due to its own weight and is engaged.
  • the latch portion 106 is provided with a release lever 106c on the opposite side of the flapper portion 101 and on the outer side of the housing 10, and when the flapper portion 101 is engaged by the latch portion 106, the release lever 106c is easily engaged by pulling up. The case can be canceled. After that, the flapper portion 101 is pushed inward from the outside of the housing 10 so that the flapper portion 101 is held by the flapper holding portion 105, so that the flapper portion 101 can be easily returned to the open position without using a special jig. It becomes possible.
  • the flapper portion 101 has a structure that can be easily moved to the open position even in the closed position, the flapper device 100 according to the present embodiment closes the flapper portion 101 when assembling the switch gear. By fixing with, it is possible to carry and install in a well-balanced manner. Therefore, workability is improved.
  • the flapper holding portions 105 are also provided on the other side of the flapper portion 101 and are located on both sides. Since the holding force of the flapper holding portion 105 is not large, the flapper portion 101 can be held in a well-balanced manner on both sides. However, depending on the size, area, angle at the open position, and the like of the flapper portion 101, it may be provided on at least one side.
  • FIG. 8 is a right side view showing an example of the structure of the switchgear according to the second embodiment
  • FIG. 9 is a perspective view showing the structure of the flapper device 100 according to the second embodiment
  • FIG. 9B is Z in FIG. 9A. It is a perspective view seen from a direction.
  • two flapper devices 100 are provided on the rear upper cover 12a and the rear lower cover 12b of the rear cable chamber 50, respectively, and the ventilation volume is increased by increasing the area of the ventilation port on the back surface of the rear cable chamber 50 to increase the ventilation volume.
  • the temperature rise in 10 was suppressed.
  • the flapper device 100 is a stack of the flapper devices 100 shown in the first embodiment in two upper and lower stages.
  • the individual flapper devices 100 can be downsized and the individual flapper portions 101 can be made lighter, thereby improving workability. Further, by reducing the weight of the flapper portion 101, the impact when the flapper portion 101 is in the closed position when an arc is generated is alleviated, and bounce is also suppressed. Further, a plurality of frame bodies 102 are attached to the housing body 10, so that the strength of the housing body 10 can be improved.
  • the frame body 102 may be a common integrated structure.
  • the flapper devices 100 can be easily arranged one above the other, increasing the ventilation volume in the housing 10 and suppressing the temperature rise in the housing 10.
  • the ball catch is taken as an example of the structure of the flapper holding portion 105, but other holding structures such as a holder mounted on the switch gear 1 and a holder using a magnet can be used as long as the position does not affect the equipment. You may.
  • one latch portion 106 is provided in the center of the lower portion of the inner frame 102a, a plurality of latch portions 106 may be provided in the lower portion of the inner frame 102a.
  • the rebound of the flapper portion 101 may be one if it is well-balanced because an excessive load is not applied to the hinge portion 103 and the like.
  • the latch 106a of the latch portion 106 is lowered by its own weight, it is not necessary to provide a spring for urging downward, but a spring for urging downward may be provided in order to suppress the rebound of the flapper portion 101.
  • the present invention is not limited to this. If the angle is increased, the ventilation area is increased, which is advantageous for heat dissipation characteristics, but if the angle is increased, the equipment inside the housing and the flapper portion 101 interfere with each other.
  • the angle may be set in consideration of these conditions.
  • Switchgear 10: Housing, 11: Door, 12a: Rear upper cover, 12b: Rear lower cover, 13: Ventilation port, 20: Circuit breaker room, 21: Circuit breaker, 30: Bus room, 31: Bus line, 40: Front cable chamber, 50: Rear cable chamber, 51: Cable, 100: Flapper device, 101: Flapper part, 101a: Flapper surface, 101b: Flapper upper part, 101c: Flapper lower part, 101d, 101e: Flapper side part, 102 : Frame body, 102a: Inner frame, 103: Hing part, 104a, 104b: Flapper side frame, 104a1, 104b1: Frame surface, 104a2, 104b2: Flange, 105: Flapper holding part, 105a: Catch part, 105b: Ball part , 106: Latch part, 106a: Latch, 106b: Groove part, 106c: Release lever.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Patch Boards (AREA)
PCT/JP2020/014436 2020-03-30 2020-03-30 逆止弁フラッパ装置及びスイッチギヤ WO2021199102A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112020007007.7T DE112020007007T5 (de) 2020-03-30 2020-03-30 Sperrventil-klappenvorrichtung und schaltanlage
JP2022512500A JP7321362B2 (ja) 2020-03-30 2020-03-30 逆止弁フラッパ装置及びスイッチギヤ
PCT/JP2020/014436 WO2021199102A1 (ja) 2020-03-30 2020-03-30 逆止弁フラッパ装置及びスイッチギヤ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/014436 WO2021199102A1 (ja) 2020-03-30 2020-03-30 逆止弁フラッパ装置及びスイッチギヤ

Publications (1)

Publication Number Publication Date
WO2021199102A1 true WO2021199102A1 (ja) 2021-10-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/014436 WO2021199102A1 (ja) 2020-03-30 2020-03-30 逆止弁フラッパ装置及びスイッチギヤ

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JP (1) JP7321362B2 (enrdf_load_stackoverflow)
DE (1) DE112020007007T5 (enrdf_load_stackoverflow)
WO (1) WO2021199102A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024154964A1 (ko) * 2023-01-19 2024-07-25 엘에스일렉트릭 (주) 환기 장치를 갖는 전력기기실

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58136903U (ja) * 1982-03-11 1983-09-14 株式会社東芝 閉鎖配電盤
JPS627709U (enrdf_load_stackoverflow) * 1985-06-27 1987-01-17
JPS63153706U (enrdf_load_stackoverflow) * 1987-03-25 1988-10-07
WO2009001425A1 (ja) * 2007-06-25 2008-12-31 Mitsubishi Electric Corporation 金属閉鎖型スイッチギヤ
JP2014140267A (ja) * 2013-01-21 2014-07-31 Toshiba Corp 金属閉鎖形スイッチギヤ
WO2018138805A1 (ja) * 2017-01-25 2018-08-02 三菱電機株式会社 スイッチギヤ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6129751B2 (ja) 2011-02-25 2017-05-17 シンセス・ゲーエムベーハーＳｙｎｔｈｅｓ ＧｍｂＨ 骨形成促進インプラント及び骨成長を誘導する方法
CN109390862A (zh) 2017-08-07 2019-02-26 通用电气公司 包括防水且防电弧结构的电气机壳的通风盖设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58136903U (ja) * 1982-03-11 1983-09-14 株式会社東芝 閉鎖配電盤
JPS627709U (enrdf_load_stackoverflow) * 1985-06-27 1987-01-17
JPS63153706U (enrdf_load_stackoverflow) * 1987-03-25 1988-10-07
WO2009001425A1 (ja) * 2007-06-25 2008-12-31 Mitsubishi Electric Corporation 金属閉鎖型スイッチギヤ
JP2014140267A (ja) * 2013-01-21 2014-07-31 Toshiba Corp 金属閉鎖形スイッチギヤ
WO2018138805A1 (ja) * 2017-01-25 2018-08-02 三菱電機株式会社 スイッチギヤ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024154964A1 (ko) * 2023-01-19 2024-07-25 엘에스일렉트릭 (주) 환기 장치를 갖는 전력기기실

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JPWO2021199102A1 (enrdf_load_stackoverflow) 2021-10-07
JP7321362B2 (ja) 2023-08-04
DE112020007007T5 (de) 2023-01-19

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