WO2016125777A1 - Pompe à fluide - Google Patents

Pompe à fluide Download PDF

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Publication number
WO2016125777A1
WO2016125777A1 PCT/JP2016/053018 JP2016053018W WO2016125777A1 WO 2016125777 A1 WO2016125777 A1 WO 2016125777A1 JP 2016053018 W JP2016053018 W JP 2016053018W WO 2016125777 A1 WO2016125777 A1 WO 2016125777A1
Authority
WO
WIPO (PCT)
Prior art keywords
float
valve
air supply
exhaust valve
storage space
Prior art date
Application number
PCT/JP2016/053018
Other languages
English (en)
Japanese (ja)
Inventor
西川嘉晃
Original Assignee
株式会社テイエルブイ
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 株式会社テイエルブイ filed Critical 株式会社テイエルブイ
Priority to JP2016573370A priority Critical patent/JP6163617B2/ja
Publication of WO2016125777A1 publication Critical patent/WO2016125777A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
    • F16K31/20—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve
    • F16K31/24—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve with a transmission with parts linked together from a single float to a single valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/56—Mechanical actuating means without stable intermediate position, e.g. with snap action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
    • F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
    • F16T1/20—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by floats
    • F16T1/22—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by floats of closed-hollow-body type
    • F16T1/24—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by floats of closed-hollow-body type using levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
    • F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
    • F16T1/38—Component parts; Accessories
    • F16T1/48—Monitoring arrangements for inspecting, e.g. flow of steam and steam condensate

Definitions

  • This application relates to a liquid pumping apparatus that pumps liquid by introducing a working gas, and particularly relates to life estimation.
  • Patent Document 1 there is known a liquid pumping device that collects a liquid generated in a vapor system or the like and pumps the liquid to a use side by the pressure of a working gas.
  • the liquid pressure feeding device of Patent Document 1 includes a sealed container in which drain generated in a steam system flows and is stored, a float accommodated in the sealed container, and a steam supply valve and an exhaust valve.
  • the float is connected to an air supply valve and an exhaust valve via a valve operating mechanism (a float arm or a snap mechanism).
  • a valve operating mechanism a float arm or a snap mechanism
  • the air supply valve opens and the exhaust valve closes. Thereby, steam is introduced into the sealed container, and the drain stored in the sealed container is discharged (pressure-fed) from the discharge port by the pressure of the steam.
  • the air supply valve is closed and the exhaust valve is opened. Thereby, the drain flows into the airtight container and is stored, and the vapor in the airtight container is discharged.
  • the life of the liquid pumping device has been estimated based on the number of operations of the liquid pumping device (for example, the number of opening / closing operations of the supply valve and the exhaust valve).
  • this estimation method has a problem in that the lifetime cannot always be estimated accurately because the degree of deterioration of the internal parts varies depending on the type and state of the liquid being handled.
  • the technology disclosed in the present application has been made in view of such circumstances, and the purpose thereof is related to a liquid pumping device including a supply valve and an exhaust valve for a working gas that opens and closes as the float moves up and down. It is to accurately estimate the lifetime.
  • the technology disclosed in the present application reduces to what extent the allowance for the float from the position where the supply valve and the exhaust valve are opened / closed to the rising limit position or the falling limit position is reduced. Based on the above, the degree of deterioration of the valve operating mechanism is judged.
  • the liquid pumping device of the present application includes a casing, an air supply valve and an exhaust valve, a valve operating mechanism, and a deterioration diagnosis device.
  • the casing has a storage space in which liquid flows in and is stored.
  • the air supply valve introduces working gas into the storage space and discharges the liquid in the storage space.
  • the exhaust valve discharges the working gas in the storage space.
  • the valve operating mechanism has a float arranged in the storage space, and is displaced as the float moves up and down. The valve operating mechanism opens the air supply valve and closes the exhaust valve when the float rises to a predetermined high level, and closes the air supply valve and closes the exhaust valve when the float descends to a predetermined low level. Open the valve.
  • the valve operating mechanism is provided with a rise limit position of the float higher than the predetermined high level and a descent limit position of the float lower than the predetermined low level.
  • the deterioration diagnosing device includes a movement allowance of the float from when the air supply valve is opened and the exhaust valve is closed until the float reaches the rising limit position, and the air supply valve is closed. When at least one of the movement allowances of the float from when the exhaust valve is opened to when the float reaches the lowering limit position becomes smaller than a predetermined value, it is determined that the valve operating mechanism has deteriorated. Is.
  • the float from when the air supply valve and the exhaust valve are opened (when the valve is closed) until the float reaches the movement limit position (the upper limit position and the lower limit position). Since the valve operating mechanism is judged to have deteriorated when the movement allowance is less than a predetermined value, the deterioration of the valve operating mechanism can be accurately recognized (detected). With this deterioration of the valve operating mechanism, the life of the liquid pumping device can be accurately estimated.
  • the amount of displacement of each part decreases. For example, the amount of rise and fall of the float with respect to the liquid level in the storage space is reduced, and the amount of displacement of the parts accompanying the rise and fall of the float is reduced.
  • the intake valve opens and the exhaust valve closes.
  • the exhaust valve closes and the exhaust valve opens.
  • the movement allowance until the lift limit position or the drop limit position is reached after the supply valve and the exhaust valve are opened is reduced. Therefore, it is possible to accurately recognize (sense) the degree of deterioration of the valve operating mechanism by grasping the degree of decrease in the float movement allowance.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of a liquid pumping apparatus according to an embodiment.
  • FIG. 2 is an enlarged cross-sectional view of the schematic configuration of the air supply valve and the exhaust valve.
  • FIG. 3 is a view for explaining a motion allowance relating to the valve operating mechanism.
  • FIG. 4 is a flowchart showing a diagnosis operation by the deterioration diagnosis device.
  • the liquid pumping apparatus 1 of this embodiment is provided in, for example, a steam system, and collects drain (condensate) generated by steam condensation and pumps it to a boiler or a waste heat utilization apparatus. That is, in this embodiment, the drain corresponds to the liquid according to the claims of the present application.
  • the liquid pumping apparatus 1 includes a casing 10 that is a sealed container, an air supply valve 20, an exhaust valve 30, and a valve operating mechanism 40.
  • the casing 10 has a main body portion 11 and a lid portion 12 coupled by bolts, and a storage space 13 in which drain (liquid) flows and is stored is formed inside.
  • the lid 12 is provided with a liquid inlet 14 through which drain flows, a liquid outlet 15 through which drain is discharged, a gas inlet 16 through which steam is introduced, and a gas outlet 17 through which steam is discharged. It has been.
  • the steam corresponds to the working gas according to the claims of the present application.
  • the liquid inflow port 14 is provided near the upper part of the lid part 12, and the liquid discharge port 15 is provided at the lower part of the lid part 12. Both the gas inlet 16 and the gas outlet 17 are provided in the upper part of the lid 12. These liquid inlets 14 and the like are all in communication with the storage space 13.
  • the gas inlet 16 is provided with an air supply valve 20, and the gas outlet 17 is provided with an exhaust valve 30.
  • the air supply valve 20 and the exhaust valve 30 open and close the gas inlet 16 and the gas outlet 17, respectively.
  • the air supply valve 20 discharges the drain of the storage space 13 from the liquid discharge port 15 by introducing steam into the storage space 13 from the gas introduction port 16.
  • the exhaust valve 30 discharges the steam introduced into the storage space 13 from the gas discharge port 17.
  • the air supply valve 20 has a valve case 21, a valve body 22, and a lifting rod 23.
  • the valve case 21 has a through hole in the axial direction, and a valve seat 24 is formed above the through hole.
  • An opening 25 through which the through hole communicates with the outside is formed in the middle portion of the valve case 21.
  • the valve body 22 is formed in a spherical shape, and is integrally provided at the upper end of the lifting rod 23.
  • the elevating rod 23 is inserted into the through hole of the valve case 21 so as to be movable up and down. When the elevating rod 23 is raised, the air supply valve 20 is separated from the valve seat 24 and the gas inlet 16 is opened. When the elevating rod 23 is lowered, the valve body 22 is seated on the valve seat 24 and gas is supplied. The inlet 16 is closed.
  • the exhaust valve 30 has a valve case 31, a valve body 32, and a lifting rod 33.
  • the valve case 31 has a through hole in the axial direction, and a valve seat 34 is formed slightly above the through hole.
  • the valve case 31 is formed with an opening 35 through which the through hole communicates with the outside.
  • the valve body 32 is formed in a substantially hemispherical shape, and is provided integrally with the upper end of the elevating rod 33.
  • the elevating rod 33 is inserted into the through hole of the valve case 31 so as to be movable up and down.
  • the elevating rod 33 When the elevating rod 33 is raised, the exhaust valve 30 is seated on the valve seat 34 and the gas discharge port 17 is closed.
  • the elevating rod 33 is lowered, the valve body 32 is separated from the valve seat 34 and the gas is exhausted.
  • the outlet 17 is opened.
  • a valve operating rod 36 is connected to the lower end of the lifting rod 33 of the exhaust valve 30. That is, the raising / lowering rod 33 of the exhaust valve 30 moves up and down as the valve operation rod 36 moves up and down.
  • the valve operating rod 36 is attached with a continuous plate 37 that extends to a region below the lifting rod 23 of the air supply valve 20.
  • the raising / lowering rod 23 of the air supply valve 20 is pushed up by the connecting plate 37 when the valve operating rod 36 is raised, and rises. That is, when the valve operating rod 36 is raised, the air supply valve 20 is opened (opens), while the exhaust valve 30 is closed (closed), and when the valve operating rod 36 is lowered, the air supply valve 20 is closed (closed).
  • the exhaust valve 30 opens (opens).
  • the valve operating mechanism 40 is provided in the casing 10 and moves the valve operating rod 36 up and down to open and close the air supply valve 20 and the exhaust valve 30.
  • the valve operating mechanism 40 includes a float 41 and a snap mechanism 50.
  • the float 41 is formed in a spherical shape and has a lever 42 attached thereto.
  • the lever 42 is rotatably supported by a shaft 43 provided on the bracket 44.
  • the lever 42 is provided with a shaft 45 at the end opposite to the float 41 side.
  • the snap mechanism 50 includes a float arm 51, a sub arm 52, a coil spring 53, and two receiving members 54 and 55.
  • One end of the float arm 51 is rotatably supported by a shaft 58 provided on the bracket 59.
  • the brackets 44 and 59 are coupled to each other by screws and attached to the lid portion 12.
  • a groove 51a is formed at the other end of the float arm 51, and the shaft 45 of the lever 42 is fitted in the groove 51a. With this configuration, the float arm 51 swings about the shaft 58 as the float 41 moves up and down.
  • the float arm 51 is provided with a shaft 56.
  • the sub arm 52 has an upper end portion rotatably supported by a shaft 58 and a lower end portion provided with a shaft 57.
  • the receiving member 54 is rotatably supported on the shaft 56 of the float arm 51, and the receiving member 55 is rotatably supported on the shaft 57 of the sub arm 52.
  • a compressed coil spring 53 is attached between the receiving members 54 and 55.
  • the sub arm 52 is provided with a shaft 61, and the lower end portion of the valve operating rod 36 is connected to the shaft 61.
  • the valve operating mechanism 40 thus configured is displaced as the float 41 moves up and down, and moves the valve operating rod 36 up and down to open and close the air supply valve 20 and the exhaust valve 30.
  • the float 41 is located at the bottom of the storage space 13 when the drain does not collect in the storage space 13.
  • the valve operating rod 36 is lowered, the air supply valve 20 is closed, and the exhaust valve 30 is open.
  • the drain flows from the liquid inlet 14 and accumulates in the storage space 13.
  • the float 41 rises.
  • the steam is discharged from the gas discharge port 17 as the drain accumulates.
  • the float 41 rises to a predetermined high level (usually a reverse high level)
  • the valve operating rod 36 is raised by the snap mechanism 50. Thereby, the air supply valve 20 is opened and the exhaust valve 30 is closed.
  • the liquid pumping apparatus 1 of the present embodiment includes an open / close detector 71, a position detector 72, and a deterioration diagnosis device 73, and diagnoses the deterioration of the valve operating mechanism 40 described above ( Detection).
  • the open / close detector 71 is provided in the upper part of the main body 11 of the casing 10 and communicates with the storage space 13.
  • the open / close detector 71 detects that the air supply valve 20 and the exhaust valve 30 are opened or closed by detecting sound, vibration, or ultrasonic waves generated by the operation of the liquid pumping device 1. is there.
  • the magnitude (level) of sound, vibration, and ultrasonic waves associated with the operation is such that when the air supply valve 20 is opened and the exhaust valve 30 is closed, the air supply valve 20 is closed. Maximum when the exhaust valve 30 opens.
  • the opening / closing detector 71 can detect the opening or closing of the air supply valve 20 or the like when the detected sound or the like becomes maximum.
  • the position detector 72 is provided in the middle of the main body 11 of the casing 10 and detects the position of the float 41.
  • the position detector 72 has a lever 72 a provided with its tip in contact with the float 41.
  • the lever 72 a of the position detector 72 rotates while the float 41 is raised and lowered while being in contact with the float 41.
  • the deterioration diagnosis unit 73 reduces how much the movement allowance (margin allowance) of the float 41 from when the air supply valve 20 and the exhaust valve 30 are opened (closed) until the float 41 reaches the movement limit position. Thus, the deterioration of the valve operating mechanism 40 is diagnosed.
  • the deterioration diagnosing device 73 determines the movement allowance of the float 41 from the time when the air supply valve 20 is opened and the exhaust valve 30 is closed until the float 41 reaches the upper movement limit position, and the air supply
  • the valve operating mechanism 40 is configured to be judged to have deteriorated.
  • the high-order movement limit position (upper movement limit position in FIG. 3) is a position higher than the predetermined high-order position described above, and corresponds to the ascent limit position according to the claims of the present application.
  • the lower movement limit position (lower movement limit position in FIG. 3) is lower than the predetermined lower position described above, and corresponds to the lower limit position according to the claims of the present application.
  • the deterioration diagnosis unit 73 receives detection signals from the open / close detector 71 and the position detector 72 and performs a diagnosis operation shown in FIG. 4 based on the detection signals. First, the deterioration diagnosing device 73 detects that the air supply valve 20 or the exhaust valve 30 is closed (opened) based on the detection signal of the open / close detector 71 (step ST1). Subsequently, the deterioration diagnosing device 73 detects the motion allowance of the float 41 based on the detection signal of the position detector 72 (step ST2).
  • the deterioration diagnosing device 73 detects the position of the float 41 when the air supply valve 20 or the exhaust valve 30 is closed (opened), that is, when it is detected in step ST1, and the movement limit position is determined from that position. The distance to is calculated.
  • the deterioration diagnosing device 73 determines (diagnose) whether or not the valve operating mechanism 40 has deteriorated based on the movement allowance of the float 41 detected in step ST2. Specifically, the deterioration diagnosing device 73 determines whether or not the movement allowance of the float 41 is smaller than a predetermined value set in advance (step ST3). Then, when the movement allowance of the float 41 is greater than or equal to a predetermined value, the deterioration diagnosing device 73 determines that the valve operating mechanism 40 is still okay (not so deteriorated as to be replaced) (step ST4).
  • the deterioration diagnosing device 73 determines that the valve operating mechanism 40 has deteriorated (life is reduced) (step ST5). In this way, the deterioration of the valve operating mechanism 40 can be accurately recognized (detected).
  • valve operating mechanism 40 when wear or foreign matter (rust, scale, etc.) adheres and accumulates at the connecting points in the float 41 or the snap mechanism 50, the amount of displacement of each component decreases. For example, the rise and fall amounts of the float 41 with respect to the drain liquid level in the storage space 13 are reduced, and the displacement amount of the float arm 51 and the like of the snap mechanism 50 accompanying the rise and fall of the float 41 is reduced. Therefore, the valve opening (closing) operation of the air supply valve 20 and the exhaust valve 30 by the valve operating mechanism 40 is delayed. That is, the “supply valve open position, exhaust valve closed position” shown in FIG.
  • the float 41 moves from the opening time (when the air supply valve 20 and the exhaust valve 30 are closed) to the movement limit position (rising limit position and descending limit position).
  • the movement allowance of the float 41 until reaching the value becomes smaller than a predetermined value, it is determined that the valve operating mechanism has deteriorated. Therefore, the deterioration of the valve operating mechanism 40 can be accurately recognized (detected).
  • the life of the liquid pumping apparatus 1 can be accurately estimated by determining the deterioration of the valve operating mechanism 40.
  • the movement allowance of the float 41 from when the air supply valve 20 and the exhaust valve 30 are opened (when closed) until the float 41 reaches the movement limit position is detected.
  • the technology disclosed in the present application is not limited to this, and the movement allowance of other components in the valve operating mechanism 40 may be detected.
  • the liquid pumping apparatus 1 of the present application detects the movement allowance of the float arm 51 of the snap mechanism 50 that is displaced (in conjunction with) the rise and fall of the float 41, and the movement allowance of the float arm 51 is a predetermined value ( It may be determined that the valve operating mechanism 40 has deteriorated when the value becomes smaller than a value different from the predetermined value described above.
  • each component is displaced as the float 41 rises and descends. Therefore, judging the deterioration of the valve operating mechanism 40 based on the movement allowance of components other than the float 41 is a result. In addition, the deterioration of the valve operating mechanism 40 is determined based on the movement allowance of the float 41, and is within the scope of the technical idea described in the claims of the present application.
  • the working gas is vapor, but it is needless to say that other gas may be used in the technology disclosed in the present application.
  • the liquid to be pumped is drained, but the technology disclosed in the present application may pump other liquids.
  • the present application is useful for a liquid pumping apparatus that pumps a liquid by introducing a working gas.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Float Valves (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

Pour estimer avec précision la durée de vie d'une pompe à fluide comprenant une soupape d'alimentation en air et une soupape d'échappement, pour un gaz de travail, qui s'ouvrent et se ferment conformément à la montée et la descente d'un flotteur, une pompe à fluide 1 comprend : un boîtier 10 ayant un espace de stockage 13 pour un fluide formé en son sein ; une soupape d'alimentation en air 20 qui guide le gaz de travail vers l'espace de stockage 13 et une soupape d'échappement 30 qui évacue le gaz de travail ; un mécanisme d'actionnement de soupape 40 qui se déplace conformément à la montée et la descente d'un flotteur 41 situé dans l'espace de stockage 13, ouvre la soupape d'alimentation en air 20 et ferme la soupape d'échappement 30 lorsque le flotteur 41 atteint une position élevée prescrite, et ferme la soupape d'alimentation en air 20 et ouvre la soupape d'échappement 30 lorsque le flotteur 41 atteint une position basse prescrite ; et une unité de diagnostic de détérioration 73 qui, si l'amplitude de mouvement du flotteur 41 à partir du moment où la soupape d'alimentation en air 20, etc., s'ouvre ou se ferme jusqu'au moment où le flotteur 41 atteint une position limite d'élévation ou une position limite de descente est inférieure à une valeur prescrite, détermine que le mécanisme d'actionnement de soupape 40 a été détérioré.
PCT/JP2016/053018 2015-02-04 2016-02-02 Pompe à fluide WO2016125777A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016573370A JP6163617B2 (ja) 2015-02-04 2016-02-02 液体圧送装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015020449 2015-02-04
JP2015-020449 2015-09-15

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Publication Number Publication Date
WO2016125777A1 true WO2016125777A1 (fr) 2016-08-11

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WO (1) WO2016125777A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019069558A1 (fr) * 2017-10-02 2019-04-11 株式会社テイエルブイ Dispositif de détermination d'état pour piège de drain ayant une fonction de pompe, et piège de drain à fonction de pompe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6649528B2 (ja) 2017-09-25 2020-02-19 株式会社テイエルブイ 液体圧送装置の劣化判定装置および液体圧送装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000146636A (ja) * 1998-11-16 2000-05-26 Japan Energy Corp 異常診断装置および異常診断方法およびプログラム記憶媒体
JP2013024274A (ja) * 2011-07-19 2013-02-04 Tlv Co Ltd 液体圧送装置のモニタリングシステム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000146636A (ja) * 1998-11-16 2000-05-26 Japan Energy Corp 異常診断装置および異常診断方法およびプログラム記憶媒体
JP2013024274A (ja) * 2011-07-19 2013-02-04 Tlv Co Ltd 液体圧送装置のモニタリングシステム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019069558A1 (fr) * 2017-10-02 2019-04-11 株式会社テイエルブイ Dispositif de détermination d'état pour piège de drain ayant une fonction de pompe, et piège de drain à fonction de pompe

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JPWO2016125777A1 (ja) 2017-08-31

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