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WO2016027669A1 - Unité de détection de fuites de liquide - Google Patents

Unité de détection de fuites de liquide Download PDF

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Publication number
WO2016027669A1
WO2016027669A1 PCT/JP2015/072186 JP2015072186W WO2016027669A1 WO 2016027669 A1 WO2016027669 A1 WO 2016027669A1 JP 2015072186 W JP2015072186 W JP 2015072186W WO 2016027669 A1 WO2016027669 A1 WO 2016027669A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
seal
shaft
sealing material
detection unit
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.)
Ceased
Application number
PCT/JP2015/072186
Other languages
English (en)
Japanese (ja)
Inventor
彰 上田
晃広 永野
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.)
Nippon Valqua Industries Ltd
Nihon Valqua Kogyo KK
Original Assignee
Nippon Valqua Industries Ltd
Nihon Valqua Kogyo KK
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 Nippon Valqua Industries Ltd, Nihon Valqua Kogyo KK filed Critical Nippon Valqua Industries Ltd
Priority to CN201580044437.8A priority Critical patent/CN106662497A/zh
Publication of WO2016027669A1 publication Critical patent/WO2016027669A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors

Definitions

  • the present invention generally relates to a liquid leak detection unit, and more particularly to a liquid leak detection unit assembled to a movable shaft.
  • Japanese Patent Laid-Open No. 2001-349500 discloses a leak detection device for a bellows type expansion tube joint for the purpose of visually confirming whether there is leakage at a glance. (Patent Document 1).
  • the leak detection device for a bellows type expansion and contraction pipe joint disclosed in Patent Document 1 includes a leak detection path in which a pressure rises when the inner pipe of the bellows type expansion and contraction is damaged, and a pressure in the leak detection path. And pressure detecting means for detecting.
  • the pressure detection means is housed in a casing that communicates with the leak detection path, and pressure-sensitive operation means that operates when the pressure in the leak detection path increases, and the tip projects from the casing by the operation of the pressure-sensitive operation means. And a detection operation element.
  • Some movable shafts used in various devices such as hydraulic cylinders and fluid pumps are assembled with a sealing material to seal liquid on the outer periphery of the shaft.
  • a sealing material As a characteristic of the sealing material, wear and sag occur with the repeated operation of the shaft, so that the sealing performance gradually decreases. For this reason, periodic maintenance of the sealing material is required.
  • the sealing material is installed inside the device, the need for maintenance of the sealing material is known only when liquid leaks outside the device. In this case, there is a problem that malfunction of the device or operation stop occurs, and it takes a long time to restore the device (from arrangement of the seal material to replacement). In addition, the liquid may leak to the outside of the device, which may contaminate the external environment.
  • an object of the present invention is to solve the above-described problems, and to provide a liquid leakage detection unit that accurately grasps the maintenance time of the sealing material and prevents the occurrence of liquid leakage.
  • the liquid leak detection unit according to the present invention is a liquid leak detection unit assembled to a movable shaft.
  • the liquid leakage detection unit is provided on the outer periphery of the shaft, and is provided on the outer periphery of the shaft with a first seal material for sealing liquid in the liquid side space on the outer periphery of the shaft, and is arranged in the axial direction of the shaft.
  • a liquid leaks from the first sealing material and the second sealing material disposed on the opposite side of the liquid side space with respect to the one sealing material an alert is generated due to an increase in pressure between the first sealing material and the second sealing material.
  • an alert sending unit for sending.
  • the liquid leakage detection unit configured in this way, when the liquid leaks from the first sealing material, the leaked liquid is sealed with the second sealing material. At this time, since a pressure increase occurs between the first sealing material and the second sealing material, the alert transmission unit transmits an alert due to the pressure increase. Thereby, it is possible to accurately grasp the maintenance time of the sealing material (first sealing material) and prevent the occurrence of liquid leakage.
  • the alert sending unit sends a stepwise alert according to the magnitude of the pressure increase.
  • liquid leak detection unit configured as described above, it is possible to prepare for the maintenance of the first seal material in advance.
  • the alert transmission unit includes a pin member operable by receiving a pressure of a liquid guided from between the first sealing material and the second sealing material.
  • liquid leak detection unit configured as described above, it is possible to accurately grasp the maintenance time of the first seal material by confirming the operation of the pin member.
  • the alert transmission unit includes a lighting unit that is turned on by detecting an increase in pressure between the first sealing material and the second sealing material.
  • liquid leak detection unit configured as described above, it is possible to accurately grasp the maintenance time of the first seal material by confirming the lighting of the lighting unit.
  • the alert transmission unit includes a sound generation unit that emits a sound by detecting an increase in pressure between the first sealing material and the second sealing material.
  • liquid leak detection unit configured in this way, it is possible to accurately grasp the maintenance time of the first seal material by confirming the sound emitted from the sound generation unit.
  • the alert transmission unit includes a display unit for displaying a pressure between the first sealing material and the second sealing material.
  • liquid leak detection unit configured as described above, it is possible to accurately grasp the maintenance time of the first seal material by confirming the pressure display on the display unit.
  • the liquid leak detection unit further includes a relief part that discharges liquid from between the first seal material and the second seal material when the pressure rise exceeds a predetermined value.
  • liquid leak detection unit configured in this way, it is possible to prevent liquid from leaking outside beyond the limit of sealing by the second seal material.
  • the liquid leak detection unit further includes a liquid return unit that returns the liquid discharged by the relief unit to the liquid side space or a liquid supply source to the liquid side space.
  • the liquid discharged by the relief portion can be used again in the liquid side space on the outer periphery of the shaft.
  • an external space is located on the opposite side of the first seal material from the second seal material in the axial direction of the shaft.
  • the second sealing material has a first lip portion for preventing liquid leakage from between the first sealing material and the second sealing material to the external space.
  • liquid leak detection unit configured in this way, when the liquid leaks from the first seal material, the leaked liquid can be sealed with the second seal material.
  • the second sealing material further has a second lip portion for preventing dust from entering from the outer space between the first sealing material and the second sealing material.
  • liquid leak detection unit configured in this way, the intrusion of dust from the external space can be further prevented by the second sealing material.
  • (Embodiment 1) 1 is a cross-sectional view showing a state in which an oil leakage detection unit according to Embodiment 1 of the present invention is assembled to a shaft.
  • oil leak detection unit 10 in the present embodiment is an assembly unit that is assembled to shaft 21.
  • the shaft 21 has a shape extending axially along the central axis 101.
  • the shaft 21 is a movable shaft. In the present embodiment, it is assumed that the shaft 21 is a hydraulic cylinder shaft.
  • the shaft 21 reciprocates in the axial direction of the central axis 101.
  • a housing 31 is provided on the outer periphery of the shaft 21.
  • the housing 31 has a shape extending in a cylindrical shape in the axial direction of the central shaft 101.
  • a liquid side space 60 is formed on the outer periphery of the shaft 21. Oil is disposed in the liquid side space 60.
  • the liquid side space 60 is provided as a hydraulic chamber to which oil for operating the shaft 21 is supplied.
  • the liquid side space 60 is provided on one side of the housing 31 in the axial direction of the central shaft 101.
  • An external space 70 is formed on the other side of the housing 31 in the axial direction of the central shaft 101.
  • the oil leak detection unit 10 in the present embodiment includes a rod seal 23, a deformed dust seal 26, and an alert transmission unit 40.
  • the rod seal 23 and the irregularly shaped dust seal 26 are closed annular seal materials.
  • the rod seal 23 and the irregular dust seal 26 are made of an elastic member such as rubber.
  • the rod seal 23 and the irregular dust seal 26 are provided on the outer periphery of the shaft 21.
  • the rod seal 23 and the irregular dust seal 26 are provided at a distance in the axial direction of the central shaft 101. In the axial direction of the central shaft 101, the rod seal 23 is provided on the liquid space 60 side, and the irregular dust seal 26 is provided on the external space 70 side.
  • the shaft 21 has a seal groove 38 and a seal groove 39 formed therein.
  • the seal groove 38 and the seal groove 39 are recessed from the inner peripheral surface 31 b of the housing 31 and have a groove shape that circulates around the central axis 101.
  • the seal groove 38 has a rectangular cross section.
  • the seal groove 39 has a rectangular cross section that is released toward the external space 70 in the axial direction of the central shaft 101.
  • the rod seal 23 and the irregular dust seal 26 are accommodated in a seal groove 38 and a seal groove 39, respectively.
  • An inter-seal space 65 is formed between the rod seal 23 and the irregular dust seal 26 on the outer periphery of the shaft 21.
  • the rod seal 23 has a sealing function for sealing the oil disposed in the liquid side space 60.
  • the deformed dust seal 26 has a lip part 27 (first lip part), a lip part 28 (second lip part), and a base part 29 as its constituent parts.
  • the base 29 is installed in the seal groove 39.
  • the lip portion 27 and the lip portion 28 extend from the base portion 29 toward the shaft 21 and contact the outer peripheral surface 21 a of the shaft 21.
  • the lip portion 27 is provided on the inter-seal space 65 side, and the lip portion 28 is provided on the external space 70 side.
  • the deformed dust seal 26 has a function of sealing the oil that has entered the inter-seal space 65 from the liquid side space 60 into the inter-seal space 65 when the oil from the rod seal 23 leaks by the lip portion 27.
  • the deformed dust seal 26 further has a function of preventing dust from entering the inter-seal space 65 from the external space 70 by the lip portion 28.
  • the present invention is not limited to this configuration, and the oil is sealed. And a sealing material having a function of preventing dust and a sealing material having a function of preventing dust from entering may be provided separately.
  • the alert transmission unit 40 transmits an alert due to a pressure increase in the space 65 between the seals when the oil disposed in the liquid side space 60 leaks from the rod seal 23.
  • the alert transmission part 40 has the block 41, the pin member 46, the spring 45, the piping 36, and the piping 37, and these are combined and comprised.
  • the block 41 is formed from a metal block body.
  • the block 41 is connected to the housing 31 via a pipe 36 and a pipe 37.
  • the housing 31 is formed with a recess 32 and a through hole 33.
  • the recess 32 and the through hole 33 are formed between the rod seal 23 and the irregular dust seal 26 in the axial direction of the central shaft 101.
  • the recess 32 is recessed from the inner peripheral surface 31 b of the housing 31 and has a shape that rotates around the central axis 101.
  • the through hole 33 extends from the bottom of the recess 32 in the radial direction centered on the central axis 101 and penetrates the housing 31.
  • the through hole 33 communicates with the pipe 36 and the pipe 37.
  • the space between the seals 65 on the housing 31 side and the pin member 46 on the alert transmitter 40 side communicate with each other through the recess 32 and the through hole 33.
  • the pin member 46 is provided so as to be operable by receiving the pressure of oil guided from the inter-seal space 65 when liquid leaks from the rod seal 23 to the inter-seal space 65.
  • the pin member 46 is supported by the block 41 so as to be able to reciprocate in the axial direction of the central shaft 102.
  • the pin member 46 has a flange portion 48 and a pin tip portion 47 as its constituent parts.
  • the flange portion 48 has a shape that spreads in a hook shape around the central axis 102.
  • the collar portion 48 is guided by the block 41 so as to be movable in the axial direction of the central shaft 101.
  • the flange 48 is provided facing the pipes 36 and 37.
  • the pin tip portion 47 is provided at the tip of the pin member 46 extending in the axial direction of the central shaft 102 and protrudes from the block 41.
  • the spring 45 is provided in the block 41 in a state of being contracted in the axial direction of the central shaft 102.
  • the spring 45 applies an elastic force to the pin member 46 in a direction to hold the pin tip portion 47 in the block 41.
  • FIG. 2 to FIG. 4 are side views showing how the alert sending unit in FIG. 1 sends an alert.
  • the rod seal 23 is worn or sag.
  • oil enters the inter-seal space 65 from the rod seal 23.
  • the deformed dust seal 26 can prevent the oil that has entered the inter-seal space 65 from leaking into the external space 70.
  • the pressure in the space 65 between the seals increases, and the increased pressure acts on the flange portion 48 of the pin member 46.
  • the pin member 46 receives the pressure increase and slides in a direction in which the pin member 46 protrudes further from the block 41 while resisting the elastic force of the spring 45. The user can accurately grasp the replacement timing of the rod seal 23 by confirming the alert transmitted by the alert transmitter 40, that is, the protruding amount of the pin member 46 from the block 41.
  • the alert sending unit 40 sends a stepwise alert according to the magnitude of the pressure increase in the space 65 between the seals.
  • the pin tip portion 47 has a region 47g, a region 47h, and a region 47i arranged in order from the pin tip side in the axial direction of the central shaft 102.
  • the region 47g, the region 47h, and the region 47i are color-coded, and are colored, for example, blue, yellow, and red, respectively.
  • the pin member 46 when there is no oil leakage from the rod seal 23, the pin member 46 is in a state in which only the region 47g colored blue projects from the block 41. As shown in FIG. 3, when oil leaks from the rod seal 23, the pin member 46 slides and the yellow colored region 47 h protrudes from the block 41 in the initial stage. As shown in FIG. 4, when oil leakage from the rod seal 23 proceeds, the pin member 46 further slides, so that a region 47 i colored red protrudes from the block 41.
  • the user can prepare in advance for the replacement of the rod seal 23 by confirming the stepwise alert transmitted from the alert transmission unit 40. For example, when only the region 47g protrudes, the state of the rod seal 23 is healthy. When the region 47h protrudes, the replacement rod seal 23 is prepared, and subsequently, the region 47i protrudes. The rod seal 23 is replaced. Thereby, the planned periodic replacement (preventive maintenance) of the rod seal 23 can be executed.
  • the alert sending unit 40 may be configured to send a step-by-step alert such as “exchange immediately”.
  • FIG. 5 is a diagram schematically showing a hydraulic circuit of a hydraulic cylinder provided with the shaft in FIG.
  • the hydraulic cylinder 100 includes a cylinder 22 in addition to the shaft 21 and the housing 31.
  • the cylinder 22 has a cylindrical shape extending in the axial direction of the central shaft 101.
  • the shaft 21 is inserted into the cylinder 22.
  • the shaft 21 has a large-diameter portion 21p as its constituent part.
  • the large diameter portion 21p is provided at the tip of the shaft 21.
  • the large diameter portion 21p slides with the inner peripheral surface of the cylinder 22 as the shaft 21 reciprocates.
  • the hydraulic chamber 51 and the hydraulic chamber 52 corresponding to the liquid side space 60 in FIG. 1 are formed on both sides of the large diameter portion 21p in the axial direction of the central shaft 101.
  • the oil leak detection unit 10 in the present embodiment further includes a relief valve 58 (relief part) and a relief pipe 54 (liquid return part).
  • the relief valve 58 discharges oil from the inter-seal space 65 when the pressure increase due to oil leakage from the rod seal 23 exceeds a predetermined value.
  • the oil discharged by the relief valve 58 is returned to the oil tank 61 through the relief pipe 54.
  • Such a configuration can prevent the hydraulic cylinder 100 and the oil leak detection unit 10 from being damaged even when the pressure in the space 65 between the seals exceeds the limit pressure for sealing by the irregular dust seal 26.
  • a relief pipe may be provided so that the oil discharged by the relief valve 58 is directly returned to the hydraulic chamber 51 or the hydraulic chamber 52.
  • the structure of the oil leak detection unit 10 according to the first embodiment of the present invention described above will be described together.
  • the oil leak detection unit 10 as the liquid leak detection unit according to the present embodiment is attached to the movable shaft 21. Assembled.
  • the oil leak detection unit 10 is provided on the outer periphery of the shaft 21.
  • the rod seal 23 as a first seal material for sealing oil as liquid in the liquid side space 60 on the outer periphery of the shaft 21, and the shaft 21.
  • the deformed dust seal 26 as a second seal material disposed on the opposite side of the liquid side space 60 with respect to the rod seal 23 in the axial direction of the shaft 21.
  • an alert transmitter 40 that transmits an alert when the pressure between the rod seal 23 and the irregular dust seal 26 increases.
  • the oil leak detection unit 10 according to Embodiment 1 of the present invention configured as described above, it is possible to accurately grasp the maintenance time of the rod seal 23 and prevent oil leak in the hydraulic cylinder 100. Thereby, in the production line using the hydraulic cylinder 100, the stop of the continuous operation due to the sealing trouble can be eradicated. Moreover, environmental pollution due to oil leakage can be eradicated.
  • the liquid leak detection unit according to the present invention can be applied to various devices, for example, fluid pumps, continuous production machines, press machines, injection molding machines, industrial robots, hydraulic lifts, tire molding machines, and the like.
  • the movable shaft to which the liquid leakage detection unit according to the present invention is assembled is not limited to a reciprocating shaft, and may be, for example, a rotating shaft or a shaft that swings in the circumferential direction. A shaft that performs a combination of these movements may be used.
  • the liquid arranged in the liquid side space in the present invention is not limited to hydraulic oil for operating the hydraulic cylinder, and may be, for example, lubricating oil, grease, water, or the like.
  • FIG. 6 is a cross-sectional view showing a state in which the oil leakage detection unit according to Embodiment 2 of the present invention is assembled to a shaft.
  • the alert transmission unit 40 in the first embodiment various modifications of the alert transmission unit 40 in the first embodiment will be described.
  • the oil leakage detection unit in the present embodiment has an alert transmission unit 80 instead of the alert transmission unit 40 in the first embodiment.
  • the alert transmitter 80 is configured to transmit an alert by a method different from that of the alert transmitter 40 when oil leaks from the rod seal 23.
  • the alert transmission unit 80 includes a sensor unit (not shown) that detects the pressure in the space 65 between the seals, and a lighting unit (not shown) that lights up when a pressure increase is detected in the sensor unit.
  • the lighting in the lighting unit includes not only continuous lighting but also repeated lighting and extinguishing (flashing).
  • the alert transmitter 80 generates a sensor (not shown) that detects the pressure in the inter-seal space 65, and generates a sound (such as a buzzer or a melody) when a pressure increase is detected in the sensor. And a sound generator (not shown).
  • the alert transmitter 80 has a display unit (not shown) that displays the pressure in the space 65 between the seals.
  • a display unit for example, a pressure gauge or a digital display of pressure can be used.
  • the alert transmitter 80 may be configured to transmit a stepwise alert according to the magnitude of the pressure increase in the space 65 between the seals.
  • a stepwise alert is realizable by changing the lighting color in a lighting part.
  • a step-wise alert is realizable by changing the kind of sound emitted.
  • the alert transmission unit 80 is not limited to the form connected to the housing 31, and may be provided at a position away from the device including the shaft 21 such as an operation room of a plant.
  • a sensor unit for detecting the pressure in the inter-seal space 65 is provided on the device side including the shaft 21, and the operation chamber or the like receives an electrical signal when a pressure increase is detected in the sensor unit.
  • Various mechanisms for sending alerts are provided.
  • This invention is used for, for example, a hydraulic cylinder and a fluid pump.
  • Oil leak detection unit 21 shaft, 21a outer peripheral surface, 21p large diameter portion, 22 cylinder, 23 rod seal, 26 deformed dust seal, 27, 28 lip portion, 29 base, 31 housing, 31b inner peripheral surface, 32 concave portion, 33 Through hole, 36, 37 piping, 38, 39 seal groove, 40, 80 alert transmission part, 41 block, 45 spring, 46 pin member, 47 pin tip part, 47g, 47h, 47i region, 48 collar part, 51, 52 Hydraulic chamber, 54 relief piping, 58 relief valve, 60 liquid side space, 61 oil tank, 65 space between seals, 70 external space, 100 hydraulic cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Sealing Devices (AREA)
  • Pipeline Systems (AREA)

Abstract

L'invention concerne une unité (10) de détection de fuites d'huile incorporée à un arbre mobile (21). L'unité (10) de détection de fuites d'huile comporte: un joint (23) de tige qui est placé sur une périphérie extérieure de l'arbre (21) et confine de l'huile dans un espace (60) côté liquide sur la périphérie extérieure de l'arbre (21); un joint déformé anti-poussière (26) qui est placé sur la périphérie extérieure de l'arbre (21) et qui est disposé du côté opposé de l'espace (60) côté liquide par rapport au joint (23) de tige dans la direction axiale de l'arbre (21); et une partie (40) d'émission d'alerte qui émet une alerte du fait d'une élévation de pression entre le joint (23) de tige et le joint déformé anti-poussière (26) lorsque de l'huile s'est échappée du joint (23) de tige. Avec cette configuration, une unité de détection de fuites de liquide qui reconnaît avec exactitude une période d'entretien d'un matériau de joint et empêche la survenue de fuites de liquide est réalisée.
PCT/JP2015/072186 2014-08-22 2015-08-05 Unité de détection de fuites de liquide Ceased WO2016027669A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201580044437.8A CN106662497A (zh) 2014-08-22 2015-08-05 液体泄漏检测单元

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014169181A JP6296500B2 (ja) 2014-08-22 2014-08-22 液体漏れ検知ユニット
JP2014-169181 2014-08-22

Publications (1)

Publication Number Publication Date
WO2016027669A1 true WO2016027669A1 (fr) 2016-02-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/072186 Ceased WO2016027669A1 (fr) 2014-08-22 2015-08-05 Unité de détection de fuites de liquide

Country Status (4)

Country Link
JP (1) JP6296500B2 (fr)
CN (1) CN106662497A (fr)
TW (1) TWI666433B (fr)
WO (1) WO2016027669A1 (fr)

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WO2019077699A1 (fr) * 2017-10-18 2019-04-25 株式会社バルカー Unité de détection de fuite de liquide
EP3460439A4 (fr) * 2016-05-16 2020-02-19 KYB Corporation Dispositif de détection de fuite de liquide

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JP7039165B2 (ja) * 2016-09-29 2022-03-22 株式会社バルカー 液体漏れ検知ユニット
JP6307648B1 (ja) * 2017-04-11 2018-04-04 株式会社堀内機械 漏洩検知システム付シリンダ装置、漏洩検知用カートリッジおよび漏洩検知システム付ドレンパイプ
KR102272598B1 (ko) * 2017-05-29 2021-07-05 엘에스엠트론 주식회사 유압감지용 유니온 볼트
TWI751210B (zh) * 2017-10-24 2022-01-01 日商華爾卡股份有限公司 液體洩漏檢測單元
CN107763010A (zh) * 2017-10-27 2018-03-06 三重机有限公司 液压缸组件及挖掘机
JP6764427B2 (ja) 2018-01-29 2020-09-30 Ｋｙｂ株式会社 流体漏れ検出機器及び往復動型流体圧機器
JP6643393B2 (ja) 2018-05-01 2020-02-12 Ｋｙｂ株式会社 流体漏れ検出システム及び流体圧システム
JP6694480B2 (ja) * 2018-08-10 2020-05-13 Ｋｙｂ株式会社 流体漏れ検出システム及び異常診断方法
KR102263584B1 (ko) * 2019-12-20 2021-06-10 디와이파워 주식회사 외부 누유 감지 구조가 구비된 유압 실린더 장치
KR102558121B1 (ko) * 2020-12-04 2023-07-21 주식회사 케이티이 블레이드용 씰 평가 장치
CN112902027B (zh) * 2021-04-07 2023-06-27 重庆龙冉能源科技有限公司 一种输气管道自动漏气检测标记装置
CN113375064A (zh) * 2021-06-16 2021-09-10 王诚宣 一种气体及液体泄漏检测传感器及方法
DE112021007791T5 (de) 2021-07-19 2024-04-18 Valqua, Ltd. Überwachungssystem für eine Flüssigkeitsdruckvorrichtung
TWI851160B (zh) * 2023-04-20 2024-08-01 台灣矽微電子股份有限公司 油壓迴路漏油偵測方法與裝置
CN117189660B (zh) * 2023-09-08 2024-04-16 大庆市顺达石油设备制造有限公司 一种耐腐蚀化工泵用机械密封装置

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JP2016045068A (ja) 2016-04-04
JP6296500B2 (ja) 2018-03-20

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