WO2016067991A1 - ガス圧力調整装置 - Google Patents
ガス圧力調整装置 Download PDFInfo
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- WO2016067991A1 WO2016067991A1 PCT/JP2015/079676 JP2015079676W WO2016067991A1 WO 2016067991 A1 WO2016067991 A1 WO 2016067991A1 JP 2015079676 W JP2015079676 W JP 2015079676W WO 2016067991 A1 WO2016067991 A1 WO 2016067991A1
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- 238000011144 upstream manufacturing Methods 0.000 claims description 23
- 230000004044 response Effects 0.000 abstract description 15
- 238000005422 blasting Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 14
- 230000004043 responsiveness Effects 0.000 description 12
- 230000007423 decrease Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/14—Control of fluid pressure with auxiliary non-electric power
- G05D16/16—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
Definitions
- the present invention relates to a governor (a gas pressure adjusting device) using a pilot governor, in which a gas or the like transported at a primary pressure from the upstream side is decompressed to a secondary pressure and supplied to the downstream side in the gas supply system.
- upstream pipe the gas transported by the primary pressure (high pressure / medium pressure) in the upstream transport pipe (hereinafter referred to as “upstream pipe”) is set to the preset secondary side set pressure.
- a gas pressure adjusting device gas governor
- downstream pipe the downstream transport pipe
- the conventional gas governor is generally connected to a main valve (governor body) 11 that adjusts the amount of gas from upstream to downstream, and a downstream pipe 13.
- a pilot governor 21 that controls the governor body 11 in response to a change in P2 (referred to as “secondary pressure”) is provided.
- the pilot governor 21 is set to operate the main valve (governor body) 11 to supply gas downstream when the secondary pressure P2 becomes equal to or lower than a predetermined reference operation control pressure Ps.
- a gas pressure adjusting device using such a pilot governor 21 has a conflicting characteristic that if the responsiveness to pressure fluctuations on the downstream side is improved, the tilt is likely to occur, and if the occurrence of the tilt is suppressed, the responsiveness is deteriorated. was there.
- Patent Document 1 In order to avoid such a state where the response is delayed and the secondary pressure P2 is extremely reduced, a prior art for improving response characteristics while suppressing the occurrence of tilt is described in Patent Document 1 as shown in FIG. The technology has been proposed.
- Patent Document 1 includes a sub pilot governor SC in addition to the main pilot governor SB.
- the downstream pipe 13 side of the sub pilot governor SC is connected to the main pilot line S26 that connects the main pilot governor SB to the downstream pipe 13 via the sub pilot line S28. Further, the operation setting pressure of the sub pilot governor SC is set lower than that of the main pilot governor SB.
- the present invention has been made in view of the above problems, and is capable of obtaining a quick response characteristic while suppressing the occurrence of tilting, and can stably ensure a sufficient flow rate ( It aims to provide gas governor).
- the gas pressure adjusting device has been made in view of the above-mentioned problems of the prior art, and reduces the gas that is installed in the middle of a pipeline and transported at the primary pressure from the upstream side to the secondary pressure.
- a main valve that flows downstream, A main pilot loop for connecting the upstream pipe line and the downstream pipe line of the main valve via a restrictor; Provided on the downstream side of the restrictor in the main pilot loop, and when the secondary pressure falls below a predetermined reference operation control pressure, control the amount of gas passing through the main pilot loop, A main pilot governor for controlling the operation of the main valve so that the secondary pressure is constant;
- a subpilot loop having one end connected between the restrictor of the main pilot loop and the main pilot governor, and the other end connected to the downstream pipe line through a path different from the main pilot loop; Provided in the sub-pilot loop, and controlling the amount of gas passing through the sub-pilot loop when the secondary pressure becomes a second reference pressure lower than the reference operation control pressure.
- the responsiveness can be further improved.
- the main pilot is connected by setting the connection point to the downstream pipe of the subpilot loop to a position different from that of the main pilot loop, and making the subpilot loop a separate path different from the main pilot loop. Stable operation is possible without affecting the governor.
- FIG. 1 It is a figure showing one embodiment of the gas pressure regulation device concerning the present invention. It is a figure which shows an example of the main valve (gas governor main body) used for the gas pressure regulator which concerns on this invention. It is a graph which shows typically the change of the secondary pressure which shows the dynamic characteristic of a gas pressure regulator, when the secondary pressure falls in a blockade state, (a) is the secondary pressure when there is no subpilot governor. (B) is a graph which shows the change of the secondary pressure at the time of providing a subpilot governor. It is a figure which shows other embodiment of the gas pressure regulator which concerns on this invention. It is a schematic diagram which shows the connection form to the downstream pipe
- FIG. 1 It is a figure which shows a dynamic characteristic when increasing a flow volume to 100 m ⁇ 3 > / h. It is a schematic diagram which shows the structure of the gas pressure regulator which concerns on a prior art. It is a figure which shows the structure of the gas pressure apparatus which concerns on patent document 1.
- FIG. 1 It is a figure which shows a dynamic characteristic when increasing a flow volume to 100 m ⁇ 3 > / h. It is a schematic diagram which shows the structure of the gas pressure regulator which concerns on a prior art. It is a figure which shows the structure of the gas pressure apparatus which concerns on patent document 1. FIG.
- FIG. 1 is a diagram illustrating an example of a configuration of a gas pressure adjusting device 10 according to the present invention
- FIG. 2 is a diagram schematically illustrating an example of a main valve (governor body) 11.
- the same number is used for the part which has the same function as the prior art shown in FIG.
- This gas pressure adjusting device 10 has a main valve 11 that is installed in the middle of a pipeline and that reduces the gas transported from the upstream side at the primary pressure P1 to the secondary pressure P2 and flows it downstream.
- the axial flow type governor employed as the main valve 11 in the present embodiment is currently widely used.
- the schematic structure thereof is a pair of drum-shaped closures 16 having a large number of slits on the peripheral surface, a rubber sleeve 17 for closing the slits of the closure 16, and a cylindrical valve body 18 for housing these.
- the control pressure Pc is applied to the space between the valve body 18 and the sleeve 17 so that the slits of the pair of drum-shaped closures 16 are opened and closed by the sleeve 17.
- the gas pressure adjusting device 10 of the present invention is provided with a pilot loop in which an upstream pipe 12 and a downstream pipe 13 are connected so as to bypass the main valve 11.
- the pilot loop includes a main pilot loop 20 and a subpilot loop 30.
- Both the main pilot loop 20 and the subpilot loop 30 are connected to the upstream pipe line 12 at the connection point C1, and the restrictor 14 is provided on the upstream pipe side.
- the restrictor 14 generates a control pressure Pc that controls the operation of the main valve 11.
- the output side of the restrictor 14 has a main pilot loop 20 connected to the downstream pipe line 13 at the connection point C 2 of the downstream pipe line 13 and a sub pilot loop 30 connected to the downstream pipe line 13 at the connection point C 3 . It is divided into two routes.
- the main pilot loop 20 is provided with a main pilot governor 21 between the restrictor 14 and the connection point C2, and the sub-pilot loop 30 is provided with a sub-pilot governor 31 between the restrictor 14 and the connection point C3. Provided.
- the output of the restrictor 14 is connected to the main valve 11 via the conduit 40 and supplies the control pressure Pc to the main valve 11.
- the sub pilot governor 31 and the main pilot governor 21 operate to decrease the control pressure Pc, and the main valve 11 opens in proportion to the decrease in the control pressure Pc.
- the main valve 11 is opened, gas is supplied from the upstream pipe 12 to the downstream pipe 13.
- a downstream secondary pressure P ⁇ b> 2 is supplied to the main pilot governor 21 via the main pilot line 20.
- the main pilot governor 21 is adjusted using spring pressure and atmospheric pressure so that a valve connected to a diaphragm provided therein opens when the secondary pressure P2 becomes equal to or lower than a predetermined reference operation control pressure Ps. ing.
- the atmospheric bleed diaphragm 22 is a diaphragm that changes the size of the opening to the atmospheric pressure, and thereby adjusts the response sensitivity of the main pilot governor 21.
- the main valve 11 When the responsiveness of the main pilot governor 21 is improved, the main valve 11 is opened at once and the secondary pressure P2 is rapidly increased. Therefore, the opening and closing of the main pilot governor 21 is repeated and the tilt is likely to occur. Since the occurrence of tilt is extremely undesirable for the gas pressure adjusting device from the viewpoint of stable control, the air bleed restrictor 22 of the main pilot governor 21 is adjusted so as to suppress tilt even if the responsiveness is somewhat deteriorated.
- the sub-pilot governor 31 has substantially the same structure and function as the main pilot governor 21. However, the sub-pilot governor 31 may not have an air bleed aperture function. Further, the sub pilot governor 31 assists the rising response of the main pilot governor 21 and therefore may have a smaller flow rate than the main pilot governor 21. For example, the sub-pilot governor 31 may have a flow rate about 1/3 that of the main pilot governor 21.
- the sub-pilot governor 31 is adjusted so as to operate at an operation control pressure Pss higher than the reference operation control pressure Ps of the main pilot governor, and has good responsiveness. Further, since the sub-pilot governor 31 has a small flow rate, the control pressure Pc is hardly lowered and the tilt is hardly generated.
- the operation control pressure Ps of the main pilot governor can be set to 2.2 kPa, and the operation control pressure Pss of the sub main pilot governor can be set to around 2.5 kPa.
- the subpilot governor 31 when the secondary pressure P2 on the downstream side decreases and becomes equal to or lower than the operation control pressure Pss of the subpilot governor, the subpilot governor 31 is first opened, and the gas flows into the upstream pipe. 12 flows through the subpilot loop 30 to the downstream pipe 13. As a result, the control pressure Pc in the downstream pipe line 40 of the restrictor 14 decreases.
- the control pressure Pc of the main valve 11 decreases, the main valve 11 opens and gas is supplied from the upstream pipe 12 to the downstream pipe 13.
- a variable throttle 23 is provided on the downstream pipe 13 side of the subpilot loop 30 as shown in FIG. You may do it. Whether or not the variable diaphragm 23 is provided is arbitrary.
- FIG. 3 is a graph schematically showing changes in the secondary pressure when the gas pressure adjusting device is operated from the state where the main valve 11 is closed.
- (a) shows a case where adjustment is performed by a gas pressure adjusting device having a configuration with only the main pilot loop 20 and no sub-pilot loop 30, and
- (b) shows the main pilot loop 20 and the sub-pilot loop 30 having the configuration of the present invention. The case where it adjusts with the gas pressure adjusting device of the structure provided with both is shown.
- the subpilot governor 31 is activated as soon as the secondary pressure falls to the operation control pressure Pss of the subpilot governor 31, and the control pressure Pc of the main valve 11 is lowered.
- the main valve 11 is opened, even if the main pilot governor 21 does not respond immediately, gas is supplied from the upstream pipe 12 to the downstream pipe 13. Therefore, the secondary pressure P2 does not extremely decrease.
- the main pilot governor 21 is also activated with a delay, so the secondary pressure P2 is immediately adjusted to a predetermined set pressure (operation control pressure Ps), and no tilt occurs. .
- the responsiveness of the main pilot governor 21 is lowered and the tilt is suppressed, the responsiveness can be improved as a whole gas pressure adjusting device.
- the connection paths from the main pilot governor 21 and the subpilot governor 31 to the downstream pipe 13 are different from each other. Therefore, even if the subpilot governor 31 operates, the secondary pressure P2 supplied to the main pilot loop 20 is not affected. Accordingly, the main pilot governor 21 can perform a stable control operation according to the actual secondary pressure P2 of the downstream pipe 13.
- FIG. 4 shows a second embodiment of the present invention
- FIG. 5 is a schematic diagram showing a connection form of the subpilot loop 30 to the downstream pipe 13 in the second embodiment and other embodiments.
- connection position C 3 ′ of the sub-pilot loop 30 to the downstream pipe line 13 is connected to a venturi narrow pipe portion 53 provided in the downstream pipe.
- connection position of the sub-pilot loop 30 to the downstream pipe 13 may be provided in the vicinity of the portion C 3 ′′ where the pipe line in the vicinity of the entrance from the main valve to the downstream pipe line spreads abruptly.
- FIG. 6 to 8 are graphs comparing the dynamic characteristics of the secondary pressure P2 and the flow rate Q during pressure adjustment by the gas pressure adjusting device according to the present invention and the conventional pressure adjusting device.
- Figure (a) of 6-8 the configuration of the present invention, i.e. as shown FIG. 1, integer branched downstream pipe side of the main pilot loop 20 secondary pressure P2 on the downstream pipe 13 from a stable place C 2
- a structure in which the downstream pipe side of the sub pilot loop 30 is connected to a position C 3 near the outlet of the downstream pipe 13 different from the connection position C 2 of the main pilot loop 30 (hereinafter referred to as “Example 1”). ) Shows the measurement results of the P2-Q dynamic characteristics of the gas pressure adjusting device.
- the downstream pipe side of the main pilot loop 20 of the gas pressure adjusting device of FIG. 1 is connected to the pressure regulating pipe as in the first embodiment, and the downstream pipe side of the sub pilot loop 30 is connected to the main pipe.
- the measurement results of the P2-Q dynamic characteristics of the configuration (hereinafter referred to as “Comparative Example 1”) connected to the pressure regulating tube at the same position C 2 as the pilot loop 20 are shown.
- FIG. 6 to FIG. 8C show the measurement results of the dynamic characteristics of P2-Q of the gas pressure adjusting device configured to control the adjustment of the secondary pressure P2 only by the main pilot loop without providing the subpilot loop 30. (Hereinafter referred to as “Comparative Example 2”).
- 6 to 8 show cases where the primary pressure P1 is changed to 0.2 MPa, 0.25 MPa, and 0.3 MPa, respectively. 6 to 8, the flow rate Q is 50 m 3 / h.
- the secondary pressure P2 is equal to the primary pressure P1 regardless of the primary pressure P1. It is maintained in a stable state.
- the secondary pressure P2 remains even after the transient vibration at the start of adjustment has subsided. The fluctuation (vibration) is relatively large up and down (see (c) of FIGS. 6 to 8).
- FIGS. 9A to 9C show dynamic characteristics when the flow rate Q is increased to 100 m 3 / h and the primary pressure P1 is increased to 0.2 MPa, 0.25 MPa, and 0.3 MPa, respectively.
- . 9A to 9C show the dynamic characteristics in the configuration of the first embodiment of the present invention on the left side, and the dynamic characteristics of Comparative Example 1 are compared on the right side.
- FIG. 9 does not show the comparative example 2, when the main valve 11 is closed, the secondary pressure P2 in the comparative example 2 also rises abruptly as in the comparative example 1 or more. .
- the connections on the downstream pipe side of the main pilot loop 20 and the sub-pilot loop 30 are set to different positions C 2 and C 3 , and the loops 20 and 30 are set to different paths independently.
- venturi 51 in the downstream pipe and connecting the downstream pipe side of the sub-pilot loop 30 to the narrow pipe portion of the venturi 51, the responsiveness when the main valve 11 is opened can be further improved.
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Abstract
Description
このようなパイロットガバナ21を使用したガス圧力調整装置は、下流側の圧力変動に対する応答性を良くすると、アオリが発生し易くなり、アオリの発生を抑えると応答性が悪くなるという、相反する特性があった。
このガス流はメインパイロットラインS26に供給される二次圧P2に影響を与える。そのためサブパイロットガバナSCが動作を開始すると、下流管の二次圧P2をメインパイロットガバナSBに正確に伝えることができず、メインパイロットガバナSBの動作が不安定になるという問題があった。
前記メインバルブの上流側の管路と下流側の管路とをリストリクタを介して接続するメインパイロットループと、
前記メインパイロットループ内の前記リストリクタの下流側に設けられて、前記二次圧が所定の基準動作制御圧以下になったときに、前記メインパイロットループを通過するガスの量を制御して、前記二次圧が一定となるように前記メインバルブを動作制御するメインパイロットガバナと、
一端が前記メインパイロットループの前記リストリクタと前記メインパイロットガバナの間に接続され、他端が前記下流側の管路に前記メインパイロットループとは異なる経路で接続されるサブパイロットループと、
前記サブパイロットループ内に設けられて、前記二次圧が前記基準動作制御圧よりも低い第2の基準圧となったときに、前記サブパイロットループ内を通過するガスの量を制御することにより前記メインバルブを動作制御するサブパイロットガバナとを備えることを特徴とする。
図1は、本発明に係るガス圧力調整装置10の構成の一例を示す図であり、図2は、メインバルブ(ガバナ本体)11の一例を模式的に示す図である。
図1のガス圧力調整装置10においては、図10示した従来技術と同様の機能を有する部分は同じ番号を使用することとする。
本実施形態においてメインバルブ11として採用しているアキシャルフロー型ガバナは現在広く普及している。その概略構造は図2に示すように、周面に多数のスリットを有する鼓型の一対のクロージャ16と該クロージャ16のスリットを塞ぐゴム製のスリーブ17とこれらを収納する円筒状のバルブボディ18を含み、バルブボディ18とスリーブ17との間の空間に制御圧Pcをかけることにより、鼓形状の一対のクロージャ16のスリットをスリーブ17で開閉させるようにしたものである。
例えば、メインパイロットガバナの動作制御圧Psを2.2kPaに設定し、サブメインパイロットガバナの動作制御圧Pssを2.5kPa前後に設定することができる。
図3(a)からわかる通り、サブパイロットループ30が無い場合には、アオリを抑制するために大気ブリード用絞り22を絞ってあるので応答性が遅く、下流側の使用量が多い場合には、二次圧P2が"0"になるまで落ちてしまう場合も起こり得る。
また、メインパイロットループ20とサブパイロットループ30において、メインパイロットガバナ21とサブパイロットガバナ31から下流管13への接続経路を、それぞれ独立した異なる経路となるように構成している。そのため、サブパイロットガバナ31が動作しても、メインパイロットループ20へ供給される二次圧P2には影響を与えない。
従って、メインパイロットガバナ21は、下流管13の実際の二次圧P2に応じて安定した制御動作行うことができる。
図6-図8の(a)は、本発明の構成、すなわち図1示すように、メインパイロットループ20の下流管側を下流管13の二次圧P2が安定した所C2から分岐した整圧管に接続し、サブパイロットループ30の下流管側をメインパイロットループ30の接続位置C2とは異なる下流管13の出口近傍の位置C3に接続した構成(以下、「実施例1」と称する)のガス圧力調整装置のP2-Q動特性の測定結果を示している。図6-図8の(b)は、図1のガス圧力調整装置のメインバイロットループ20の下流管側を実施例1と同様に整圧管に接続し、サブパイロットループ30の下流管側をメインパイロットループ20と同じ位置C2である整圧管に接続した構成(以下、「比較例1」と称する)のP2-Q動特性の測定結果を示す。図6-図8の(c)はサブパイロットループ30を設けずにメインパイロットループだけで二次圧P2の調整を制御する構成のガス圧力調整装置のP2-Qの動特性の測定結果を示す(以下、「比較例2」と称する)。
初期の過渡的振動が収まった後はできるだけ安定していることが望ましく、このような上下振動幅(振幅)は、ほぼ0.1kPaが許容限界値であり、比較例1の動特性は限界ぎりぎりの振動値となっている(特に図7、図8の(b)参照)。
11 メインバルブ(ガバナ本体)
12 上流側輸送管(上流管)
13 下流側輸送管(下流管)
14 リストリクタ
16 クロージャ
17 スリーブ
18 バルブボディ
19 上流側接続管路
20 メインパイロットループ
21 メインパイロットガバナ
22 大気ブリード用絞り
23 可変絞り23
30 サブパイロットループ
31 サブパイロットガバナ
50 第2の実施形態に係るガス圧力調整装置
51 ベンチュリー
53 細管部
P1 一次圧
P2 二次圧
Pc 制御圧
Ps 基準動作制御圧
Pss サブパイロットガバナの動作制御圧
Q 流量
Claims (3)
- 管路の途中に設置されて上流側から一次圧で輸送されてくるガスを二次圧に減圧して下流側に流すメインバルブと、
前記メインバルブの上流側の管路と下流側の管路とをリストリクタを介して接続するメインパイロットループと、
前記メインパイロットループ内の前記リストリクタの下流側に設けられて、前記二次圧が所定の基準圧以下になったときに、前記メインパイロットループを通過するガスの量を制御して、前記二次圧が一定となるように前記メインバルブを動作制御するメインパイロットガバナと、
一端が前記メインパイロットループの前記リストリクタと前記メインパイロットガバナの間に接続され、他端が前記下流側の管路に前記メインパイロットループとは異なる経路で接続されるサブパイロットループと、
前記サブパイロットループ内に設けられて、前記二次圧が前記基準圧よりも高い第2の基準圧となったときに、前記サブパイロットループ内を通過するガスの量を制御することにより前記メインバルブを動作制御するサブパイロットガバナを備えることを特徴とするガス圧力調整装置。 - 前記サブパイロットループは、前記下流側の管路に接続される前記他端が、前記下流側の管路に設けられたベンチュリーの細管部に接続されることを特徴とする請求項1に記載のガス圧力調整装置。
- 前記サブパイロットループは、前記下流側に接続される前記他端が、前記下流側の管路の前記メインバルブ出力口近くに接続されることを特徴とする請求項1に記載のガス圧力調整装置。
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RU2017118398A RU2659348C1 (ru) | 2014-10-31 | 2015-10-21 | Устройство регулирования давления газа |
SG11201702870QA SG11201702870QA (en) | 2014-10-31 | 2015-10-21 | Gas pressure regulating device |
CN201580058344.0A CN107003683B (zh) | 2014-10-31 | 2015-10-21 | 气体压力调整装置 |
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JPS5722242Y2 (ja) * | 1976-12-02 | 1982-05-14 | ||
JP3237925B2 (ja) * | 1992-10-27 | 2001-12-10 | 大阪瓦斯株式会社 | 圧力制御装置とその圧力設定方法 |
CN1163804C (zh) * | 1997-02-06 | 2004-08-25 | Smc株式会社 | 气动调节器 |
JP4488945B2 (ja) * | 2005-03-31 | 2010-06-23 | 大阪瓦斯株式会社 | 整圧装置 |
JP4454533B2 (ja) * | 2005-05-16 | 2010-04-21 | 東京瓦斯株式会社 | 圧力調整器 |
JP5319056B2 (ja) * | 2006-08-01 | 2013-10-16 | トヨタ自動車株式会社 | 燃料電池システム |
JP5547608B2 (ja) * | 2010-11-04 | 2014-07-16 | 東京瓦斯株式会社 | 整圧装置 |
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- 2015-10-21 CN CN201580058344.0A patent/CN107003683B/zh active Active
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JPH08171425A (ja) * | 1994-12-19 | 1996-07-02 | Tokico Ltd | 圧力制御装置 |
JPH11212656A (ja) * | 1998-01-30 | 1999-08-06 | Osaka Gas Co Ltd | 整圧機構 |
JP2012500938A (ja) * | 2008-08-29 | 2012-01-12 | デルファイ・テクノロジーズ・ホールディング・エス.アー.エール.エル. | 改良燃料圧力調整システム及びこのシステムで使用するための改良燃料圧力調整器 |
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Also Published As
Publication number | Publication date |
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CN107003683B (zh) | 2020-03-20 |
CN107003683A (zh) | 2017-08-01 |
TW201624164A (zh) | 2016-07-01 |
MY179014A (en) | 2020-10-26 |
TWI652561B (zh) | 2019-03-01 |
RU2659348C1 (ru) | 2018-06-29 |
JP6335757B2 (ja) | 2018-05-30 |
JP2016091199A (ja) | 2016-05-23 |
SG11201702870QA (en) | 2017-05-30 |
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